Optimize drawing by updating the screen in one go
[tig] / tig.c
1 /* Copyright (c) 2006-2009 Jonas Fonseca <fonseca@diku.dk>
2  *
3  * This program is free software; you can redistribute it and/or
4  * modify it under the terms of the GNU General Public License as
5  * published by the Free Software Foundation; either version 2 of
6  * the License, or (at your option) any later version.
7  *
8  * This program is distributed in the hope that it will be useful,
9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
11  * GNU General Public License for more details.
12  */
13
14 #ifdef HAVE_CONFIG_H
15 #include "config.h"
16 #endif
17
18 #ifndef TIG_VERSION
19 #define TIG_VERSION "unknown-version"
20 #endif
21
22 #ifndef DEBUG
23 #define NDEBUG
24 #endif
25
26 #include <assert.h>
27 #include <errno.h>
28 #include <ctype.h>
29 #include <signal.h>
30 #include <stdarg.h>
31 #include <stdio.h>
32 #include <stdlib.h>
33 #include <string.h>
34 #include <sys/types.h>
35 #include <sys/wait.h>
36 #include <sys/stat.h>
37 #include <sys/select.h>
38 #include <unistd.h>
39 #include <time.h>
40 #include <fcntl.h>
41
42 #include <regex.h>
43
44 #include <locale.h>
45 #include <langinfo.h>
46 #include <iconv.h>
47
48 /* ncurses(3): Must be defined to have extended wide-character functions. */
49 #define _XOPEN_SOURCE_EXTENDED
50
51 #ifdef HAVE_NCURSESW_NCURSES_H
52 #include <ncursesw/ncurses.h>
53 #else
54 #ifdef HAVE_NCURSES_NCURSES_H
55 #include <ncurses/ncurses.h>
56 #else
57 #include <ncurses.h>
58 #endif
59 #endif
60
61 #if __GNUC__ >= 3
62 #define __NORETURN __attribute__((__noreturn__))
63 #else
64 #define __NORETURN
65 #endif
66
67 static void __NORETURN die(const char *err, ...);
68 static void warn(const char *msg, ...);
69 static void report(const char *msg, ...);
70 static void set_nonblocking_input(bool loading);
71 static size_t utf8_length(const char *string, int *width, size_t max_width, int *trimmed, bool reserve);
72 static int load_refs(void);
73
74 #define ABS(x)          ((x) >= 0  ? (x) : -(x))
75 #define MIN(x, y)       ((x) < (y) ? (x) :  (y))
76
77 #define ARRAY_SIZE(x)   (sizeof(x) / sizeof(x[0]))
78 #define STRING_SIZE(x)  (sizeof(x) - 1)
79
80 #define SIZEOF_STR      1024    /* Default string size. */
81 #define SIZEOF_REF      256     /* Size of symbolic or SHA1 ID. */
82 #define SIZEOF_REV      41      /* Holds a SHA-1 and an ending NUL. */
83 #define SIZEOF_ARG      32      /* Default argument array size. */
84
85 /* Revision graph */
86
87 #define REVGRAPH_INIT   'I'
88 #define REVGRAPH_MERGE  'M'
89 #define REVGRAPH_BRANCH '+'
90 #define REVGRAPH_COMMIT '*'
91 #define REVGRAPH_BOUND  '^'
92
93 #define SIZEOF_REVGRAPH 19      /* Size of revision ancestry graphics. */
94
95 /* This color name can be used to refer to the default term colors. */
96 #define COLOR_DEFAULT   (-1)
97
98 #define ICONV_NONE      ((iconv_t) -1)
99 #ifndef ICONV_CONST
100 #define ICONV_CONST     /* nothing */
101 #endif
102
103 /* The format and size of the date column in the main view. */
104 #define DATE_FORMAT     "%Y-%m-%d %H:%M"
105 #define DATE_COLS       STRING_SIZE("2006-04-29 14:21 ")
106
107 #define AUTHOR_COLS     20
108 #define ID_COLS         8
109
110 /* The default interval between line numbers. */
111 #define NUMBER_INTERVAL 5
112
113 #define TAB_SIZE        8
114
115 #define SCALE_SPLIT_VIEW(height)        ((height) * 2 / 3)
116
117 #define NULL_ID         "0000000000000000000000000000000000000000"
118
119 #ifndef GIT_CONFIG
120 #define GIT_CONFIG "config"
121 #endif
122
123 /* Some ascii-shorthands fitted into the ncurses namespace. */
124 #define KEY_TAB         '\t'
125 #define KEY_RETURN      '\r'
126 #define KEY_ESC         27
127
128
129 struct ref {
130         char *name;             /* Ref name; tag or head names are shortened. */
131         char id[SIZEOF_REV];    /* Commit SHA1 ID */
132         unsigned int head:1;    /* Is it the current HEAD? */
133         unsigned int tag:1;     /* Is it a tag? */
134         unsigned int ltag:1;    /* If so, is the tag local? */
135         unsigned int remote:1;  /* Is it a remote ref? */
136         unsigned int tracked:1; /* Is it the remote for the current HEAD? */
137         unsigned int next:1;    /* For ref lists: are there more refs? */
138 };
139
140 static struct ref **get_refs(const char *id);
141
142 enum format_flags {
143         FORMAT_ALL,             /* Perform replacement in all arguments. */
144         FORMAT_DASH,            /* Perform replacement up until "--". */
145         FORMAT_NONE             /* No replacement should be performed. */
146 };
147
148 static bool format_argv(const char *dst[], const char *src[], enum format_flags flags);
149
150 struct int_map {
151         const char *name;
152         int namelen;
153         int value;
154 };
155
156 static int
157 set_from_int_map(struct int_map *map, size_t map_size,
158                  int *value, const char *name, int namelen)
159 {
160
161         int i;
162
163         for (i = 0; i < map_size; i++)
164                 if (namelen == map[i].namelen &&
165                     !strncasecmp(name, map[i].name, namelen)) {
166                         *value = map[i].value;
167                         return OK;
168                 }
169
170         return ERR;
171 }
172
173 enum input_status {
174         INPUT_OK,
175         INPUT_SKIP,
176         INPUT_STOP,
177         INPUT_CANCEL
178 };
179
180 typedef enum input_status (*input_handler)(void *data, char *buf, int c);
181
182 static char *prompt_input(const char *prompt, input_handler handler, void *data);
183 static bool prompt_yesno(const char *prompt);
184
185 /*
186  * String helpers
187  */
188
189 static inline void
190 string_ncopy_do(char *dst, size_t dstlen, const char *src, size_t srclen)
191 {
192         if (srclen > dstlen - 1)
193                 srclen = dstlen - 1;
194
195         strncpy(dst, src, srclen);
196         dst[srclen] = 0;
197 }
198
199 /* Shorthands for safely copying into a fixed buffer. */
200
201 #define string_copy(dst, src) \
202         string_ncopy_do(dst, sizeof(dst), src, sizeof(src))
203
204 #define string_ncopy(dst, src, srclen) \
205         string_ncopy_do(dst, sizeof(dst), src, srclen)
206
207 #define string_copy_rev(dst, src) \
208         string_ncopy_do(dst, SIZEOF_REV, src, SIZEOF_REV - 1)
209
210 #define string_add(dst, from, src) \
211         string_ncopy_do(dst + (from), sizeof(dst) - (from), src, sizeof(src))
212
213 static char *
214 chomp_string(char *name)
215 {
216         int namelen;
217
218         while (isspace(*name))
219                 name++;
220
221         namelen = strlen(name) - 1;
222         while (namelen > 0 && isspace(name[namelen]))
223                 name[namelen--] = 0;
224
225         return name;
226 }
227
228 static bool
229 string_nformat(char *buf, size_t bufsize, size_t *bufpos, const char *fmt, ...)
230 {
231         va_list args;
232         size_t pos = bufpos ? *bufpos : 0;
233
234         va_start(args, fmt);
235         pos += vsnprintf(buf + pos, bufsize - pos, fmt, args);
236         va_end(args);
237
238         if (bufpos)
239                 *bufpos = pos;
240
241         return pos >= bufsize ? FALSE : TRUE;
242 }
243
244 #define string_format(buf, fmt, args...) \
245         string_nformat(buf, sizeof(buf), NULL, fmt, args)
246
247 #define string_format_from(buf, from, fmt, args...) \
248         string_nformat(buf, sizeof(buf), from, fmt, args)
249
250 static int
251 string_enum_compare(const char *str1, const char *str2, int len)
252 {
253         size_t i;
254
255 #define string_enum_sep(x) ((x) == '-' || (x) == '_' || (x) == '.')
256
257         /* Diff-Header == DIFF_HEADER */
258         for (i = 0; i < len; i++) {
259                 if (toupper(str1[i]) == toupper(str2[i]))
260                         continue;
261
262                 if (string_enum_sep(str1[i]) &&
263                     string_enum_sep(str2[i]))
264                         continue;
265
266                 return str1[i] - str2[i];
267         }
268
269         return 0;
270 }
271
272 #define prefixcmp(str1, str2) \
273         strncmp(str1, str2, STRING_SIZE(str2))
274
275 static inline int
276 suffixcmp(const char *str, int slen, const char *suffix)
277 {
278         size_t len = slen >= 0 ? slen : strlen(str);
279         size_t suffixlen = strlen(suffix);
280
281         return suffixlen < len ? strcmp(str + len - suffixlen, suffix) : -1;
282 }
283
284
285 static bool
286 argv_from_string(const char *argv[SIZEOF_ARG], int *argc, char *cmd)
287 {
288         int valuelen;
289
290         while (*cmd && *argc < SIZEOF_ARG && (valuelen = strcspn(cmd, " \t"))) {
291                 bool advance = cmd[valuelen] != 0;
292
293                 cmd[valuelen] = 0;
294                 argv[(*argc)++] = chomp_string(cmd);
295                 cmd = chomp_string(cmd + valuelen + advance);
296         }
297
298         if (*argc < SIZEOF_ARG)
299                 argv[*argc] = NULL;
300         return *argc < SIZEOF_ARG;
301 }
302
303 static void
304 argv_from_env(const char **argv, const char *name)
305 {
306         char *env = argv ? getenv(name) : NULL;
307         int argc = 0;
308
309         if (env && *env)
310                 env = strdup(env);
311         if (env && !argv_from_string(argv, &argc, env))
312                 die("Too many arguments in the `%s` environment variable", name);
313 }
314
315
316 /*
317  * Executing external commands.
318  */
319
320 enum io_type {
321         IO_FD,                  /* File descriptor based IO. */
322         IO_BG,                  /* Execute command in the background. */
323         IO_FG,                  /* Execute command with same std{in,out,err}. */
324         IO_RD,                  /* Read only fork+exec IO. */
325         IO_WR,                  /* Write only fork+exec IO. */
326         IO_AP,                  /* Append fork+exec output to file. */
327 };
328
329 struct io {
330         enum io_type type;      /* The requested type of pipe. */
331         const char *dir;        /* Directory from which to execute. */
332         pid_t pid;              /* Pipe for reading or writing. */
333         int pipe;               /* Pipe end for reading or writing. */
334         int error;              /* Error status. */
335         const char *argv[SIZEOF_ARG];   /* Shell command arguments. */
336         char *buf;              /* Read buffer. */
337         size_t bufalloc;        /* Allocated buffer size. */
338         size_t bufsize;         /* Buffer content size. */
339         char *bufpos;           /* Current buffer position. */
340         unsigned int eof:1;     /* Has end of file been reached. */
341 };
342
343 static void
344 reset_io(struct io *io)
345 {
346         io->pipe = -1;
347         io->pid = 0;
348         io->buf = io->bufpos = NULL;
349         io->bufalloc = io->bufsize = 0;
350         io->error = 0;
351         io->eof = 0;
352 }
353
354 static void
355 init_io(struct io *io, const char *dir, enum io_type type)
356 {
357         reset_io(io);
358         io->type = type;
359         io->dir = dir;
360 }
361
362 static bool
363 init_io_rd(struct io *io, const char *argv[], const char *dir,
364                 enum format_flags flags)
365 {
366         init_io(io, dir, IO_RD);
367         return format_argv(io->argv, argv, flags);
368 }
369
370 static bool
371 io_open(struct io *io, const char *name)
372 {
373         init_io(io, NULL, IO_FD);
374         io->pipe = *name ? open(name, O_RDONLY) : STDIN_FILENO;
375         return io->pipe != -1;
376 }
377
378 static bool
379 kill_io(struct io *io)
380 {
381         return io->pid == 0 || kill(io->pid, SIGKILL) != -1;
382 }
383
384 static bool
385 done_io(struct io *io)
386 {
387         pid_t pid = io->pid;
388
389         if (io->pipe != -1)
390                 close(io->pipe);
391         free(io->buf);
392         reset_io(io);
393
394         while (pid > 0) {
395                 int status;
396                 pid_t waiting = waitpid(pid, &status, 0);
397
398                 if (waiting < 0) {
399                         if (errno == EINTR)
400                                 continue;
401                         report("waitpid failed (%s)", strerror(errno));
402                         return FALSE;
403                 }
404
405                 return waiting == pid &&
406                        !WIFSIGNALED(status) &&
407                        WIFEXITED(status) &&
408                        !WEXITSTATUS(status);
409         }
410
411         return TRUE;
412 }
413
414 static bool
415 start_io(struct io *io)
416 {
417         int pipefds[2] = { -1, -1 };
418
419         if (io->type == IO_FD)
420                 return TRUE;
421
422         if ((io->type == IO_RD || io->type == IO_WR) &&
423             pipe(pipefds) < 0)
424                 return FALSE;
425         else if (io->type == IO_AP)
426                 pipefds[1] = io->pipe;
427
428         if ((io->pid = fork())) {
429                 if (pipefds[!(io->type == IO_WR)] != -1)
430                         close(pipefds[!(io->type == IO_WR)]);
431                 if (io->pid != -1) {
432                         io->pipe = pipefds[!!(io->type == IO_WR)];
433                         return TRUE;
434                 }
435
436         } else {
437                 if (io->type != IO_FG) {
438                         int devnull = open("/dev/null", O_RDWR);
439                         int readfd  = io->type == IO_WR ? pipefds[0] : devnull;
440                         int writefd = (io->type == IO_RD || io->type == IO_AP)
441                                                         ? pipefds[1] : devnull;
442
443                         dup2(readfd,  STDIN_FILENO);
444                         dup2(writefd, STDOUT_FILENO);
445                         dup2(devnull, STDERR_FILENO);
446
447                         close(devnull);
448                         if (pipefds[0] != -1)
449                                 close(pipefds[0]);
450                         if (pipefds[1] != -1)
451                                 close(pipefds[1]);
452                 }
453
454                 if (io->dir && *io->dir && chdir(io->dir) == -1)
455                         die("Failed to change directory: %s", strerror(errno));
456
457                 execvp(io->argv[0], (char *const*) io->argv);
458                 die("Failed to execute program: %s", strerror(errno));
459         }
460
461         if (pipefds[!!(io->type == IO_WR)] != -1)
462                 close(pipefds[!!(io->type == IO_WR)]);
463         return FALSE;
464 }
465
466 static bool
467 run_io(struct io *io, const char **argv, const char *dir, enum io_type type)
468 {
469         init_io(io, dir, type);
470         if (!format_argv(io->argv, argv, FORMAT_NONE))
471                 return FALSE;
472         return start_io(io);
473 }
474
475 static int
476 run_io_do(struct io *io)
477 {
478         return start_io(io) && done_io(io);
479 }
480
481 static int
482 run_io_bg(const char **argv)
483 {
484         struct io io = {};
485
486         init_io(&io, NULL, IO_BG);
487         if (!format_argv(io.argv, argv, FORMAT_NONE))
488                 return FALSE;
489         return run_io_do(&io);
490 }
491
492 static bool
493 run_io_fg(const char **argv, const char *dir)
494 {
495         struct io io = {};
496
497         init_io(&io, dir, IO_FG);
498         if (!format_argv(io.argv, argv, FORMAT_NONE))
499                 return FALSE;
500         return run_io_do(&io);
501 }
502
503 static bool
504 run_io_append(const char **argv, enum format_flags flags, int fd)
505 {
506         struct io io = {};
507
508         init_io(&io, NULL, IO_AP);
509         io.pipe = fd;
510         if (format_argv(io.argv, argv, flags))
511                 return run_io_do(&io);
512         close(fd);
513         return FALSE;
514 }
515
516 static bool
517 run_io_rd(struct io *io, const char **argv, enum format_flags flags)
518 {
519         return init_io_rd(io, argv, NULL, flags) && start_io(io);
520 }
521
522 static bool
523 io_eof(struct io *io)
524 {
525         return io->eof;
526 }
527
528 static int
529 io_error(struct io *io)
530 {
531         return io->error;
532 }
533
534 static bool
535 io_strerror(struct io *io)
536 {
537         return strerror(io->error);
538 }
539
540 static bool
541 io_can_read(struct io *io)
542 {
543         struct timeval tv = { 0, 500 };
544         fd_set fds;
545
546         FD_ZERO(&fds);
547         FD_SET(io->pipe, &fds);
548
549         return select(io->pipe + 1, &fds, NULL, NULL, &tv) > 0;
550 }
551
552 static ssize_t
553 io_read(struct io *io, void *buf, size_t bufsize)
554 {
555         do {
556                 ssize_t readsize = read(io->pipe, buf, bufsize);
557
558                 if (readsize < 0 && (errno == EAGAIN || errno == EINTR))
559                         continue;
560                 else if (readsize == -1)
561                         io->error = errno;
562                 else if (readsize == 0)
563                         io->eof = 1;
564                 return readsize;
565         } while (1);
566 }
567
568 static char *
569 io_get(struct io *io, int c, bool can_read)
570 {
571         char *eol;
572         ssize_t readsize;
573
574         if (!io->buf) {
575                 io->buf = io->bufpos = malloc(BUFSIZ);
576                 if (!io->buf)
577                         return NULL;
578                 io->bufalloc = BUFSIZ;
579                 io->bufsize = 0;
580         }
581
582         while (TRUE) {
583                 if (io->bufsize > 0) {
584                         eol = memchr(io->bufpos, c, io->bufsize);
585                         if (eol) {
586                                 char *line = io->bufpos;
587
588                                 *eol = 0;
589                                 io->bufpos = eol + 1;
590                                 io->bufsize -= io->bufpos - line;
591                                 return line;
592                         }
593                 }
594
595                 if (io_eof(io)) {
596                         if (io->bufsize) {
597                                 io->bufpos[io->bufsize] = 0;
598                                 io->bufsize = 0;
599                                 return io->bufpos;
600                         }
601                         return NULL;
602                 }
603
604                 if (!can_read)
605                         return NULL;
606
607                 if (io->bufsize > 0 && io->bufpos > io->buf)
608                         memmove(io->buf, io->bufpos, io->bufsize);
609
610                 io->bufpos = io->buf;
611                 readsize = io_read(io, io->buf + io->bufsize, io->bufalloc - io->bufsize);
612                 if (io_error(io))
613                         return NULL;
614                 io->bufsize += readsize;
615         }
616 }
617
618 static bool
619 io_write(struct io *io, const void *buf, size_t bufsize)
620 {
621         size_t written = 0;
622
623         while (!io_error(io) && written < bufsize) {
624                 ssize_t size;
625
626                 size = write(io->pipe, buf + written, bufsize - written);
627                 if (size < 0 && (errno == EAGAIN || errno == EINTR))
628                         continue;
629                 else if (size == -1)
630                         io->error = errno;
631                 else
632                         written += size;
633         }
634
635         return written == bufsize;
636 }
637
638 static bool
639 run_io_buf(const char **argv, char buf[], size_t bufsize)
640 {
641         struct io io = {};
642         bool error;
643
644         if (!run_io_rd(&io, argv, FORMAT_NONE))
645                 return FALSE;
646
647         io.buf = io.bufpos = buf;
648         io.bufalloc = bufsize;
649         error = !io_get(&io, '\n', TRUE) && io_error(&io);
650         io.buf = NULL;
651
652         return done_io(&io) || error;
653 }
654
655 static int read_properties(struct io *io, const char *separators, int (*read)(char *, size_t, char *, size_t));
656
657 /*
658  * User requests
659  */
660
661 #define REQ_INFO \
662         /* XXX: Keep the view request first and in sync with views[]. */ \
663         REQ_GROUP("View switching") \
664         REQ_(VIEW_MAIN,         "Show main view"), \
665         REQ_(VIEW_DIFF,         "Show diff view"), \
666         REQ_(VIEW_LOG,          "Show log view"), \
667         REQ_(VIEW_TREE,         "Show tree view"), \
668         REQ_(VIEW_BLOB,         "Show blob view"), \
669         REQ_(VIEW_BLAME,        "Show blame view"), \
670         REQ_(VIEW_HELP,         "Show help page"), \
671         REQ_(VIEW_PAGER,        "Show pager view"), \
672         REQ_(VIEW_STATUS,       "Show status view"), \
673         REQ_(VIEW_STAGE,        "Show stage view"), \
674         \
675         REQ_GROUP("View manipulation") \
676         REQ_(ENTER,             "Enter current line and scroll"), \
677         REQ_(NEXT,              "Move to next"), \
678         REQ_(PREVIOUS,          "Move to previous"), \
679         REQ_(PARENT,            "Move to parent"), \
680         REQ_(VIEW_NEXT,         "Move focus to next view"), \
681         REQ_(REFRESH,           "Reload and refresh"), \
682         REQ_(MAXIMIZE,          "Maximize the current view"), \
683         REQ_(VIEW_CLOSE,        "Close the current view"), \
684         REQ_(QUIT,              "Close all views and quit"), \
685         \
686         REQ_GROUP("View specific requests") \
687         REQ_(STATUS_UPDATE,     "Update file status"), \
688         REQ_(STATUS_REVERT,     "Revert file changes"), \
689         REQ_(STATUS_MERGE,      "Merge file using external tool"), \
690         REQ_(STAGE_NEXT,        "Find next chunk to stage"), \
691         \
692         REQ_GROUP("Cursor navigation") \
693         REQ_(MOVE_UP,           "Move cursor one line up"), \
694         REQ_(MOVE_DOWN,         "Move cursor one line down"), \
695         REQ_(MOVE_PAGE_DOWN,    "Move cursor one page down"), \
696         REQ_(MOVE_PAGE_UP,      "Move cursor one page up"), \
697         REQ_(MOVE_FIRST_LINE,   "Move cursor to first line"), \
698         REQ_(MOVE_LAST_LINE,    "Move cursor to last line"), \
699         \
700         REQ_GROUP("Scrolling") \
701         REQ_(SCROLL_LINE_UP,    "Scroll one line up"), \
702         REQ_(SCROLL_LINE_DOWN,  "Scroll one line down"), \
703         REQ_(SCROLL_PAGE_UP,    "Scroll one page up"), \
704         REQ_(SCROLL_PAGE_DOWN,  "Scroll one page down"), \
705         \
706         REQ_GROUP("Searching") \
707         REQ_(SEARCH,            "Search the view"), \
708         REQ_(SEARCH_BACK,       "Search backwards in the view"), \
709         REQ_(FIND_NEXT,         "Find next search match"), \
710         REQ_(FIND_PREV,         "Find previous search match"), \
711         \
712         REQ_GROUP("Option manipulation") \
713         REQ_(TOGGLE_LINENO,     "Toggle line numbers"), \
714         REQ_(TOGGLE_DATE,       "Toggle date display"), \
715         REQ_(TOGGLE_AUTHOR,     "Toggle author display"), \
716         REQ_(TOGGLE_REV_GRAPH,  "Toggle revision graph visualization"), \
717         REQ_(TOGGLE_REFS,       "Toggle reference display (tags/branches)"), \
718         \
719         REQ_GROUP("Misc") \
720         REQ_(PROMPT,            "Bring up the prompt"), \
721         REQ_(SCREEN_REDRAW,     "Redraw the screen"), \
722         REQ_(SHOW_VERSION,      "Show version information"), \
723         REQ_(STOP_LOADING,      "Stop all loading views"), \
724         REQ_(EDIT,              "Open in editor"), \
725         REQ_(NONE,              "Do nothing")
726
727
728 /* User action requests. */
729 enum request {
730 #define REQ_GROUP(help)
731 #define REQ_(req, help) REQ_##req
732
733         /* Offset all requests to avoid conflicts with ncurses getch values. */
734         REQ_OFFSET = KEY_MAX + 1,
735         REQ_INFO
736
737 #undef  REQ_GROUP
738 #undef  REQ_
739 };
740
741 struct request_info {
742         enum request request;
743         const char *name;
744         int namelen;
745         const char *help;
746 };
747
748 static struct request_info req_info[] = {
749 #define REQ_GROUP(help) { 0, NULL, 0, (help) },
750 #define REQ_(req, help) { REQ_##req, (#req), STRING_SIZE(#req), (help) }
751         REQ_INFO
752 #undef  REQ_GROUP
753 #undef  REQ_
754 };
755
756 static enum request
757 get_request(const char *name)
758 {
759         int namelen = strlen(name);
760         int i;
761
762         for (i = 0; i < ARRAY_SIZE(req_info); i++)
763                 if (req_info[i].namelen == namelen &&
764                     !string_enum_compare(req_info[i].name, name, namelen))
765                         return req_info[i].request;
766
767         return REQ_NONE;
768 }
769
770
771 /*
772  * Options
773  */
774
775 static const char usage[] =
776 "tig " TIG_VERSION " (" __DATE__ ")\n"
777 "\n"
778 "Usage: tig        [options] [revs] [--] [paths]\n"
779 "   or: tig show   [options] [revs] [--] [paths]\n"
780 "   or: tig blame  [rev] path\n"
781 "   or: tig status\n"
782 "   or: tig <      [git command output]\n"
783 "\n"
784 "Options:\n"
785 "  -v, --version   Show version and exit\n"
786 "  -h, --help      Show help message and exit";
787
788 /* Option and state variables. */
789 static bool opt_date                    = TRUE;
790 static bool opt_author                  = TRUE;
791 static bool opt_line_number             = FALSE;
792 static bool opt_line_graphics           = TRUE;
793 static bool opt_rev_graph               = FALSE;
794 static bool opt_show_refs               = TRUE;
795 static int opt_num_interval             = NUMBER_INTERVAL;
796 static int opt_tab_size                 = TAB_SIZE;
797 static int opt_author_cols              = AUTHOR_COLS-1;
798 static char opt_path[SIZEOF_STR]        = "";
799 static char opt_file[SIZEOF_STR]        = "";
800 static char opt_ref[SIZEOF_REF]         = "";
801 static char opt_head[SIZEOF_REF]        = "";
802 static char opt_head_rev[SIZEOF_REV]    = "";
803 static char opt_remote[SIZEOF_REF]      = "";
804 static char opt_encoding[20]            = "UTF-8";
805 static bool opt_utf8                    = TRUE;
806 static char opt_codeset[20]             = "UTF-8";
807 static iconv_t opt_iconv                = ICONV_NONE;
808 static char opt_search[SIZEOF_STR]      = "";
809 static char opt_cdup[SIZEOF_STR]        = "";
810 static char opt_prefix[SIZEOF_STR]      = "";
811 static char opt_git_dir[SIZEOF_STR]     = "";
812 static signed char opt_is_inside_work_tree      = -1; /* set to TRUE or FALSE */
813 static char opt_editor[SIZEOF_STR]      = "";
814 static FILE *opt_tty                    = NULL;
815
816 #define is_initial_commit()     (!*opt_head_rev)
817 #define is_head_commit(rev)     (!strcmp((rev), "HEAD") || !strcmp(opt_head_rev, (rev)))
818
819 static enum request
820 parse_options(int argc, const char *argv[], const char ***run_argv)
821 {
822         enum request request = REQ_VIEW_MAIN;
823         const char *subcommand;
824         bool seen_dashdash = FALSE;
825         /* XXX: This is vulnerable to the user overriding options
826          * required for the main view parser. */
827         static const char *custom_argv[SIZEOF_ARG] = {
828                 "git", "log", "--no-color", "--pretty=raw", "--parents",
829                         "--topo-order", NULL
830         };
831         int i, j = 6;
832
833         if (!isatty(STDIN_FILENO))
834                 return REQ_VIEW_PAGER;
835
836         if (argc <= 1)
837                 return REQ_VIEW_MAIN;
838
839         subcommand = argv[1];
840         if (!strcmp(subcommand, "status") || !strcmp(subcommand, "-S")) {
841                 if (!strcmp(subcommand, "-S"))
842                         warn("`-S' has been deprecated; use `tig status' instead");
843                 if (argc > 2)
844                         warn("ignoring arguments after `%s'", subcommand);
845                 return REQ_VIEW_STATUS;
846
847         } else if (!strcmp(subcommand, "blame")) {
848                 if (argc <= 2 || argc > 4)
849                         die("invalid number of options to blame\n\n%s", usage);
850
851                 i = 2;
852                 if (argc == 4) {
853                         string_ncopy(opt_ref, argv[i], strlen(argv[i]));
854                         i++;
855                 }
856
857                 string_ncopy(opt_file, argv[i], strlen(argv[i]));
858                 return REQ_VIEW_BLAME;
859
860         } else if (!strcmp(subcommand, "show")) {
861                 request = REQ_VIEW_DIFF;
862
863         } else if (!strcmp(subcommand, "log") || !strcmp(subcommand, "diff")) {
864                 request = subcommand[0] == 'l' ? REQ_VIEW_LOG : REQ_VIEW_DIFF;
865                 warn("`tig %s' has been deprecated", subcommand);
866
867         } else {
868                 subcommand = NULL;
869         }
870
871         if (subcommand) {
872                 custom_argv[1] = subcommand;
873                 j = 2;
874         }
875
876         for (i = 1 + !!subcommand; i < argc; i++) {
877                 const char *opt = argv[i];
878
879                 if (seen_dashdash || !strcmp(opt, "--")) {
880                         seen_dashdash = TRUE;
881
882                 } else if (!strcmp(opt, "-v") || !strcmp(opt, "--version")) {
883                         printf("tig version %s\n", TIG_VERSION);
884                         return REQ_NONE;
885
886                 } else if (!strcmp(opt, "-h") || !strcmp(opt, "--help")) {
887                         printf("%s\n", usage);
888                         return REQ_NONE;
889                 }
890
891                 custom_argv[j++] = opt;
892                 if (j >= ARRAY_SIZE(custom_argv))
893                         die("command too long");
894         }
895
896         custom_argv[j] = NULL;
897         *run_argv = custom_argv;
898
899         return request;
900 }
901
902
903 /*
904  * Line-oriented content detection.
905  */
906
907 #define LINE_INFO \
908 LINE(DIFF_HEADER,  "diff --git ",       COLOR_YELLOW,   COLOR_DEFAULT,  0), \
909 LINE(DIFF_CHUNK,   "@@",                COLOR_MAGENTA,  COLOR_DEFAULT,  0), \
910 LINE(DIFF_ADD,     "+",                 COLOR_GREEN,    COLOR_DEFAULT,  0), \
911 LINE(DIFF_DEL,     "-",                 COLOR_RED,      COLOR_DEFAULT,  0), \
912 LINE(DIFF_INDEX,        "index ",         COLOR_BLUE,   COLOR_DEFAULT,  0), \
913 LINE(DIFF_OLDMODE,      "old file mode ", COLOR_YELLOW, COLOR_DEFAULT,  0), \
914 LINE(DIFF_NEWMODE,      "new file mode ", COLOR_YELLOW, COLOR_DEFAULT,  0), \
915 LINE(DIFF_COPY_FROM,    "copy from",      COLOR_YELLOW, COLOR_DEFAULT,  0), \
916 LINE(DIFF_COPY_TO,      "copy to",        COLOR_YELLOW, COLOR_DEFAULT,  0), \
917 LINE(DIFF_RENAME_FROM,  "rename from",    COLOR_YELLOW, COLOR_DEFAULT,  0), \
918 LINE(DIFF_RENAME_TO,    "rename to",      COLOR_YELLOW, COLOR_DEFAULT,  0), \
919 LINE(DIFF_SIMILARITY,   "similarity ",    COLOR_YELLOW, COLOR_DEFAULT,  0), \
920 LINE(DIFF_DISSIMILARITY,"dissimilarity ", COLOR_YELLOW, COLOR_DEFAULT,  0), \
921 LINE(DIFF_TREE,         "diff-tree ",     COLOR_BLUE,   COLOR_DEFAULT,  0), \
922 LINE(PP_AUTHOR,    "Author: ",          COLOR_CYAN,     COLOR_DEFAULT,  0), \
923 LINE(PP_COMMIT,    "Commit: ",          COLOR_MAGENTA,  COLOR_DEFAULT,  0), \
924 LINE(PP_MERGE,     "Merge: ",           COLOR_BLUE,     COLOR_DEFAULT,  0), \
925 LINE(PP_DATE,      "Date:   ",          COLOR_YELLOW,   COLOR_DEFAULT,  0), \
926 LINE(PP_ADATE,     "AuthorDate: ",      COLOR_YELLOW,   COLOR_DEFAULT,  0), \
927 LINE(PP_CDATE,     "CommitDate: ",      COLOR_YELLOW,   COLOR_DEFAULT,  0), \
928 LINE(PP_REFS,      "Refs: ",            COLOR_RED,      COLOR_DEFAULT,  0), \
929 LINE(COMMIT,       "commit ",           COLOR_GREEN,    COLOR_DEFAULT,  0), \
930 LINE(PARENT,       "parent ",           COLOR_BLUE,     COLOR_DEFAULT,  0), \
931 LINE(TREE,         "tree ",             COLOR_BLUE,     COLOR_DEFAULT,  0), \
932 LINE(AUTHOR,       "author ",           COLOR_CYAN,     COLOR_DEFAULT,  0), \
933 LINE(COMMITTER,    "committer ",        COLOR_MAGENTA,  COLOR_DEFAULT,  0), \
934 LINE(SIGNOFF,      "    Signed-off-by", COLOR_YELLOW,   COLOR_DEFAULT,  0), \
935 LINE(ACKED,        "    Acked-by",      COLOR_YELLOW,   COLOR_DEFAULT,  0), \
936 LINE(DEFAULT,      "",                  COLOR_DEFAULT,  COLOR_DEFAULT,  A_NORMAL), \
937 LINE(CURSOR,       "",                  COLOR_WHITE,    COLOR_GREEN,    A_BOLD), \
938 LINE(STATUS,       "",                  COLOR_GREEN,    COLOR_DEFAULT,  0), \
939 LINE(DELIMITER,    "",                  COLOR_MAGENTA,  COLOR_DEFAULT,  0), \
940 LINE(DATE,         "",                  COLOR_BLUE,     COLOR_DEFAULT,  0), \
941 LINE(LINE_NUMBER,  "",                  COLOR_CYAN,     COLOR_DEFAULT,  0), \
942 LINE(TITLE_BLUR,   "",                  COLOR_WHITE,    COLOR_BLUE,     0), \
943 LINE(TITLE_FOCUS,  "",                  COLOR_WHITE,    COLOR_BLUE,     A_BOLD), \
944 LINE(MAIN_AUTHOR,  "",                  COLOR_GREEN,    COLOR_DEFAULT,  0), \
945 LINE(MAIN_COMMIT,  "",                  COLOR_DEFAULT,  COLOR_DEFAULT,  0), \
946 LINE(MAIN_TAG,     "",                  COLOR_MAGENTA,  COLOR_DEFAULT,  A_BOLD), \
947 LINE(MAIN_LOCAL_TAG,"",                 COLOR_MAGENTA,  COLOR_DEFAULT,  0), \
948 LINE(MAIN_REMOTE,  "",                  COLOR_YELLOW,   COLOR_DEFAULT,  0), \
949 LINE(MAIN_TRACKED, "",                  COLOR_YELLOW,   COLOR_DEFAULT,  A_BOLD), \
950 LINE(MAIN_REF,     "",                  COLOR_CYAN,     COLOR_DEFAULT,  0), \
951 LINE(MAIN_HEAD,    "",                  COLOR_CYAN,     COLOR_DEFAULT,  A_BOLD), \
952 LINE(MAIN_REVGRAPH,"",                  COLOR_MAGENTA,  COLOR_DEFAULT,  0), \
953 LINE(TREE_PARENT,  "",                  COLOR_DEFAULT,  COLOR_DEFAULT,  A_BOLD), \
954 LINE(TREE_MODE,    "",                  COLOR_CYAN,     COLOR_DEFAULT,  0), \
955 LINE(TREE_DIR,     "",                  COLOR_YELLOW,   COLOR_DEFAULT,  A_NORMAL), \
956 LINE(TREE_FILE,    "",                  COLOR_DEFAULT,  COLOR_DEFAULT,  A_NORMAL), \
957 LINE(STAT_HEAD,    "",                  COLOR_YELLOW,   COLOR_DEFAULT,  0), \
958 LINE(STAT_SECTION, "",                  COLOR_CYAN,     COLOR_DEFAULT,  0), \
959 LINE(STAT_NONE,    "",                  COLOR_DEFAULT,  COLOR_DEFAULT,  0), \
960 LINE(STAT_STAGED,  "",                  COLOR_MAGENTA,  COLOR_DEFAULT,  0), \
961 LINE(STAT_UNSTAGED,"",                  COLOR_MAGENTA,  COLOR_DEFAULT,  0), \
962 LINE(STAT_UNTRACKED,"",                 COLOR_MAGENTA,  COLOR_DEFAULT,  0), \
963 LINE(BLAME_ID,     "",                  COLOR_MAGENTA,  COLOR_DEFAULT,  0)
964
965 enum line_type {
966 #define LINE(type, line, fg, bg, attr) \
967         LINE_##type
968         LINE_INFO,
969         LINE_NONE
970 #undef  LINE
971 };
972
973 struct line_info {
974         const char *name;       /* Option name. */
975         int namelen;            /* Size of option name. */
976         const char *line;       /* The start of line to match. */
977         int linelen;            /* Size of string to match. */
978         int fg, bg, attr;       /* Color and text attributes for the lines. */
979 };
980
981 static struct line_info line_info[] = {
982 #define LINE(type, line, fg, bg, attr) \
983         { #type, STRING_SIZE(#type), (line), STRING_SIZE(line), (fg), (bg), (attr) }
984         LINE_INFO
985 #undef  LINE
986 };
987
988 static enum line_type
989 get_line_type(const char *line)
990 {
991         int linelen = strlen(line);
992         enum line_type type;
993
994         for (type = 0; type < ARRAY_SIZE(line_info); type++)
995                 /* Case insensitive search matches Signed-off-by lines better. */
996                 if (linelen >= line_info[type].linelen &&
997                     !strncasecmp(line_info[type].line, line, line_info[type].linelen))
998                         return type;
999
1000         return LINE_DEFAULT;
1001 }
1002
1003 static inline int
1004 get_line_attr(enum line_type type)
1005 {
1006         assert(type < ARRAY_SIZE(line_info));
1007         return COLOR_PAIR(type) | line_info[type].attr;
1008 }
1009
1010 static struct line_info *
1011 get_line_info(const char *name)
1012 {
1013         size_t namelen = strlen(name);
1014         enum line_type type;
1015
1016         for (type = 0; type < ARRAY_SIZE(line_info); type++)
1017                 if (namelen == line_info[type].namelen &&
1018                     !string_enum_compare(line_info[type].name, name, namelen))
1019                         return &line_info[type];
1020
1021         return NULL;
1022 }
1023
1024 static void
1025 init_colors(void)
1026 {
1027         int default_bg = line_info[LINE_DEFAULT].bg;
1028         int default_fg = line_info[LINE_DEFAULT].fg;
1029         enum line_type type;
1030
1031         start_color();
1032
1033         if (assume_default_colors(default_fg, default_bg) == ERR) {
1034                 default_bg = COLOR_BLACK;
1035                 default_fg = COLOR_WHITE;
1036         }
1037
1038         for (type = 0; type < ARRAY_SIZE(line_info); type++) {
1039                 struct line_info *info = &line_info[type];
1040                 int bg = info->bg == COLOR_DEFAULT ? default_bg : info->bg;
1041                 int fg = info->fg == COLOR_DEFAULT ? default_fg : info->fg;
1042
1043                 init_pair(type, fg, bg);
1044         }
1045 }
1046
1047 struct line {
1048         enum line_type type;
1049
1050         /* State flags */
1051         unsigned int selected:1;
1052         unsigned int dirty:1;
1053         unsigned int cleareol:1;
1054
1055         void *data;             /* User data */
1056 };
1057
1058
1059 /*
1060  * Keys
1061  */
1062
1063 struct keybinding {
1064         int alias;
1065         enum request request;
1066 };
1067
1068 static struct keybinding default_keybindings[] = {
1069         /* View switching */
1070         { 'm',          REQ_VIEW_MAIN },
1071         { 'd',          REQ_VIEW_DIFF },
1072         { 'l',          REQ_VIEW_LOG },
1073         { 't',          REQ_VIEW_TREE },
1074         { 'f',          REQ_VIEW_BLOB },
1075         { 'B',          REQ_VIEW_BLAME },
1076         { 'p',          REQ_VIEW_PAGER },
1077         { 'h',          REQ_VIEW_HELP },
1078         { 'S',          REQ_VIEW_STATUS },
1079         { 'c',          REQ_VIEW_STAGE },
1080
1081         /* View manipulation */
1082         { 'q',          REQ_VIEW_CLOSE },
1083         { KEY_TAB,      REQ_VIEW_NEXT },
1084         { KEY_RETURN,   REQ_ENTER },
1085         { KEY_UP,       REQ_PREVIOUS },
1086         { KEY_DOWN,     REQ_NEXT },
1087         { 'R',          REQ_REFRESH },
1088         { KEY_F(5),     REQ_REFRESH },
1089         { 'O',          REQ_MAXIMIZE },
1090
1091         /* Cursor navigation */
1092         { 'k',          REQ_MOVE_UP },
1093         { 'j',          REQ_MOVE_DOWN },
1094         { KEY_HOME,     REQ_MOVE_FIRST_LINE },
1095         { KEY_END,      REQ_MOVE_LAST_LINE },
1096         { KEY_NPAGE,    REQ_MOVE_PAGE_DOWN },
1097         { ' ',          REQ_MOVE_PAGE_DOWN },
1098         { KEY_PPAGE,    REQ_MOVE_PAGE_UP },
1099         { 'b',          REQ_MOVE_PAGE_UP },
1100         { '-',          REQ_MOVE_PAGE_UP },
1101
1102         /* Scrolling */
1103         { KEY_IC,       REQ_SCROLL_LINE_UP },
1104         { KEY_DC,       REQ_SCROLL_LINE_DOWN },
1105         { 'w',          REQ_SCROLL_PAGE_UP },
1106         { 's',          REQ_SCROLL_PAGE_DOWN },
1107
1108         /* Searching */
1109         { '/',          REQ_SEARCH },
1110         { '?',          REQ_SEARCH_BACK },
1111         { 'n',          REQ_FIND_NEXT },
1112         { 'N',          REQ_FIND_PREV },
1113
1114         /* Misc */
1115         { 'Q',          REQ_QUIT },
1116         { 'z',          REQ_STOP_LOADING },
1117         { 'v',          REQ_SHOW_VERSION },
1118         { 'r',          REQ_SCREEN_REDRAW },
1119         { '.',          REQ_TOGGLE_LINENO },
1120         { 'D',          REQ_TOGGLE_DATE },
1121         { 'A',          REQ_TOGGLE_AUTHOR },
1122         { 'g',          REQ_TOGGLE_REV_GRAPH },
1123         { 'F',          REQ_TOGGLE_REFS },
1124         { ':',          REQ_PROMPT },
1125         { 'u',          REQ_STATUS_UPDATE },
1126         { '!',          REQ_STATUS_REVERT },
1127         { 'M',          REQ_STATUS_MERGE },
1128         { '@',          REQ_STAGE_NEXT },
1129         { ',',          REQ_PARENT },
1130         { 'e',          REQ_EDIT },
1131 };
1132
1133 #define KEYMAP_INFO \
1134         KEYMAP_(GENERIC), \
1135         KEYMAP_(MAIN), \
1136         KEYMAP_(DIFF), \
1137         KEYMAP_(LOG), \
1138         KEYMAP_(TREE), \
1139         KEYMAP_(BLOB), \
1140         KEYMAP_(BLAME), \
1141         KEYMAP_(PAGER), \
1142         KEYMAP_(HELP), \
1143         KEYMAP_(STATUS), \
1144         KEYMAP_(STAGE)
1145
1146 enum keymap {
1147 #define KEYMAP_(name) KEYMAP_##name
1148         KEYMAP_INFO
1149 #undef  KEYMAP_
1150 };
1151
1152 static struct int_map keymap_table[] = {
1153 #define KEYMAP_(name) { #name, STRING_SIZE(#name), KEYMAP_##name }
1154         KEYMAP_INFO
1155 #undef  KEYMAP_
1156 };
1157
1158 #define set_keymap(map, name) \
1159         set_from_int_map(keymap_table, ARRAY_SIZE(keymap_table), map, name, strlen(name))
1160
1161 struct keybinding_table {
1162         struct keybinding *data;
1163         size_t size;
1164 };
1165
1166 static struct keybinding_table keybindings[ARRAY_SIZE(keymap_table)];
1167
1168 static void
1169 add_keybinding(enum keymap keymap, enum request request, int key)
1170 {
1171         struct keybinding_table *table = &keybindings[keymap];
1172
1173         table->data = realloc(table->data, (table->size + 1) * sizeof(*table->data));
1174         if (!table->data)
1175                 die("Failed to allocate keybinding");
1176         table->data[table->size].alias = key;
1177         table->data[table->size++].request = request;
1178 }
1179
1180 /* Looks for a key binding first in the given map, then in the generic map, and
1181  * lastly in the default keybindings. */
1182 static enum request
1183 get_keybinding(enum keymap keymap, int key)
1184 {
1185         size_t i;
1186
1187         for (i = 0; i < keybindings[keymap].size; i++)
1188                 if (keybindings[keymap].data[i].alias == key)
1189                         return keybindings[keymap].data[i].request;
1190
1191         for (i = 0; i < keybindings[KEYMAP_GENERIC].size; i++)
1192                 if (keybindings[KEYMAP_GENERIC].data[i].alias == key)
1193                         return keybindings[KEYMAP_GENERIC].data[i].request;
1194
1195         for (i = 0; i < ARRAY_SIZE(default_keybindings); i++)
1196                 if (default_keybindings[i].alias == key)
1197                         return default_keybindings[i].request;
1198
1199         return (enum request) key;
1200 }
1201
1202
1203 struct key {
1204         const char *name;
1205         int value;
1206 };
1207
1208 static struct key key_table[] = {
1209         { "Enter",      KEY_RETURN },
1210         { "Space",      ' ' },
1211         { "Backspace",  KEY_BACKSPACE },
1212         { "Tab",        KEY_TAB },
1213         { "Escape",     KEY_ESC },
1214         { "Left",       KEY_LEFT },
1215         { "Right",      KEY_RIGHT },
1216         { "Up",         KEY_UP },
1217         { "Down",       KEY_DOWN },
1218         { "Insert",     KEY_IC },
1219         { "Delete",     KEY_DC },
1220         { "Hash",       '#' },
1221         { "Home",       KEY_HOME },
1222         { "End",        KEY_END },
1223         { "PageUp",     KEY_PPAGE },
1224         { "PageDown",   KEY_NPAGE },
1225         { "F1",         KEY_F(1) },
1226         { "F2",         KEY_F(2) },
1227         { "F3",         KEY_F(3) },
1228         { "F4",         KEY_F(4) },
1229         { "F5",         KEY_F(5) },
1230         { "F6",         KEY_F(6) },
1231         { "F7",         KEY_F(7) },
1232         { "F8",         KEY_F(8) },
1233         { "F9",         KEY_F(9) },
1234         { "F10",        KEY_F(10) },
1235         { "F11",        KEY_F(11) },
1236         { "F12",        KEY_F(12) },
1237 };
1238
1239 static int
1240 get_key_value(const char *name)
1241 {
1242         int i;
1243
1244         for (i = 0; i < ARRAY_SIZE(key_table); i++)
1245                 if (!strcasecmp(key_table[i].name, name))
1246                         return key_table[i].value;
1247
1248         if (strlen(name) == 1 && isprint(*name))
1249                 return (int) *name;
1250
1251         return ERR;
1252 }
1253
1254 static const char *
1255 get_key_name(int key_value)
1256 {
1257         static char key_char[] = "'X'";
1258         const char *seq = NULL;
1259         int key;
1260
1261         for (key = 0; key < ARRAY_SIZE(key_table); key++)
1262                 if (key_table[key].value == key_value)
1263                         seq = key_table[key].name;
1264
1265         if (seq == NULL &&
1266             key_value < 127 &&
1267             isprint(key_value)) {
1268                 key_char[1] = (char) key_value;
1269                 seq = key_char;
1270         }
1271
1272         return seq ? seq : "(no key)";
1273 }
1274
1275 static const char *
1276 get_key(enum request request)
1277 {
1278         static char buf[BUFSIZ];
1279         size_t pos = 0;
1280         char *sep = "";
1281         int i;
1282
1283         buf[pos] = 0;
1284
1285         for (i = 0; i < ARRAY_SIZE(default_keybindings); i++) {
1286                 struct keybinding *keybinding = &default_keybindings[i];
1287
1288                 if (keybinding->request != request)
1289                         continue;
1290
1291                 if (!string_format_from(buf, &pos, "%s%s", sep,
1292                                         get_key_name(keybinding->alias)))
1293                         return "Too many keybindings!";
1294                 sep = ", ";
1295         }
1296
1297         return buf;
1298 }
1299
1300 struct run_request {
1301         enum keymap keymap;
1302         int key;
1303         const char *argv[SIZEOF_ARG];
1304 };
1305
1306 static struct run_request *run_request;
1307 static size_t run_requests;
1308
1309 static enum request
1310 add_run_request(enum keymap keymap, int key, int argc, const char **argv)
1311 {
1312         struct run_request *req;
1313
1314         if (argc >= ARRAY_SIZE(req->argv) - 1)
1315                 return REQ_NONE;
1316
1317         req = realloc(run_request, (run_requests + 1) * sizeof(*run_request));
1318         if (!req)
1319                 return REQ_NONE;
1320
1321         run_request = req;
1322         req = &run_request[run_requests];
1323         req->keymap = keymap;
1324         req->key = key;
1325         req->argv[0] = NULL;
1326
1327         if (!format_argv(req->argv, argv, FORMAT_NONE))
1328                 return REQ_NONE;
1329
1330         return REQ_NONE + ++run_requests;
1331 }
1332
1333 static struct run_request *
1334 get_run_request(enum request request)
1335 {
1336         if (request <= REQ_NONE)
1337                 return NULL;
1338         return &run_request[request - REQ_NONE - 1];
1339 }
1340
1341 static void
1342 add_builtin_run_requests(void)
1343 {
1344         const char *cherry_pick[] = { "git", "cherry-pick", "%(commit)", NULL };
1345         const char *gc[] = { "git", "gc", NULL };
1346         struct {
1347                 enum keymap keymap;
1348                 int key;
1349                 int argc;
1350                 const char **argv;
1351         } reqs[] = {
1352                 { KEYMAP_MAIN,    'C', ARRAY_SIZE(cherry_pick) - 1, cherry_pick },
1353                 { KEYMAP_GENERIC, 'G', ARRAY_SIZE(gc) - 1, gc },
1354         };
1355         int i;
1356
1357         for (i = 0; i < ARRAY_SIZE(reqs); i++) {
1358                 enum request req;
1359
1360                 req = add_run_request(reqs[i].keymap, reqs[i].key, reqs[i].argc, reqs[i].argv);
1361                 if (req != REQ_NONE)
1362                         add_keybinding(reqs[i].keymap, req, reqs[i].key);
1363         }
1364 }
1365
1366 /*
1367  * User config file handling.
1368  */
1369
1370 static struct int_map color_map[] = {
1371 #define COLOR_MAP(name) { #name, STRING_SIZE(#name), COLOR_##name }
1372         COLOR_MAP(DEFAULT),
1373         COLOR_MAP(BLACK),
1374         COLOR_MAP(BLUE),
1375         COLOR_MAP(CYAN),
1376         COLOR_MAP(GREEN),
1377         COLOR_MAP(MAGENTA),
1378         COLOR_MAP(RED),
1379         COLOR_MAP(WHITE),
1380         COLOR_MAP(YELLOW),
1381 };
1382
1383 #define set_color(color, name) \
1384         set_from_int_map(color_map, ARRAY_SIZE(color_map), color, name, strlen(name))
1385
1386 static struct int_map attr_map[] = {
1387 #define ATTR_MAP(name) { #name, STRING_SIZE(#name), A_##name }
1388         ATTR_MAP(NORMAL),
1389         ATTR_MAP(BLINK),
1390         ATTR_MAP(BOLD),
1391         ATTR_MAP(DIM),
1392         ATTR_MAP(REVERSE),
1393         ATTR_MAP(STANDOUT),
1394         ATTR_MAP(UNDERLINE),
1395 };
1396
1397 #define set_attribute(attr, name) \
1398         set_from_int_map(attr_map, ARRAY_SIZE(attr_map), attr, name, strlen(name))
1399
1400 static int   config_lineno;
1401 static bool  config_errors;
1402 static const char *config_msg;
1403
1404 /* Wants: object fgcolor bgcolor [attr] */
1405 static int
1406 option_color_command(int argc, const char *argv[])
1407 {
1408         struct line_info *info;
1409
1410         if (argc != 3 && argc != 4) {
1411                 config_msg = "Wrong number of arguments given to color command";
1412                 return ERR;
1413         }
1414
1415         info = get_line_info(argv[0]);
1416         if (!info) {
1417                 if (!string_enum_compare(argv[0], "main-delim", strlen("main-delim"))) {
1418                         info = get_line_info("delimiter");
1419
1420                 } else if (!string_enum_compare(argv[0], "main-date", strlen("main-date"))) {
1421                         info = get_line_info("date");
1422
1423                 } else {
1424                         config_msg = "Unknown color name";
1425                         return ERR;
1426                 }
1427         }
1428
1429         if (set_color(&info->fg, argv[1]) == ERR ||
1430             set_color(&info->bg, argv[2]) == ERR) {
1431                 config_msg = "Unknown color";
1432                 return ERR;
1433         }
1434
1435         if (argc == 4 && set_attribute(&info->attr, argv[3]) == ERR) {
1436                 config_msg = "Unknown attribute";
1437                 return ERR;
1438         }
1439
1440         return OK;
1441 }
1442
1443 static bool parse_bool(const char *s)
1444 {
1445         return (!strcmp(s, "1") || !strcmp(s, "true") ||
1446                 !strcmp(s, "yes")) ? TRUE : FALSE;
1447 }
1448
1449 static int
1450 parse_int(const char *s, int default_value, int min, int max)
1451 {
1452         int value = atoi(s);
1453
1454         return (value < min || value > max) ? default_value : value;
1455 }
1456
1457 /* Wants: name = value */
1458 static int
1459 option_set_command(int argc, const char *argv[])
1460 {
1461         if (argc != 3) {
1462                 config_msg = "Wrong number of arguments given to set command";
1463                 return ERR;
1464         }
1465
1466         if (strcmp(argv[1], "=")) {
1467                 config_msg = "No value assigned";
1468                 return ERR;
1469         }
1470
1471         if (!strcmp(argv[0], "show-author")) {
1472                 opt_author = parse_bool(argv[2]);
1473                 return OK;
1474         }
1475
1476         if (!strcmp(argv[0], "show-date")) {
1477                 opt_date = parse_bool(argv[2]);
1478                 return OK;
1479         }
1480
1481         if (!strcmp(argv[0], "show-rev-graph")) {
1482                 opt_rev_graph = parse_bool(argv[2]);
1483                 return OK;
1484         }
1485
1486         if (!strcmp(argv[0], "show-refs")) {
1487                 opt_show_refs = parse_bool(argv[2]);
1488                 return OK;
1489         }
1490
1491         if (!strcmp(argv[0], "show-line-numbers")) {
1492                 opt_line_number = parse_bool(argv[2]);
1493                 return OK;
1494         }
1495
1496         if (!strcmp(argv[0], "line-graphics")) {
1497                 opt_line_graphics = parse_bool(argv[2]);
1498                 return OK;
1499         }
1500
1501         if (!strcmp(argv[0], "line-number-interval")) {
1502                 opt_num_interval = parse_int(argv[2], opt_num_interval, 1, 1024);
1503                 return OK;
1504         }
1505
1506         if (!strcmp(argv[0], "author-width")) {
1507                 opt_author_cols = parse_int(argv[2], opt_author_cols, 0, 1024);
1508                 return OK;
1509         }
1510
1511         if (!strcmp(argv[0], "tab-size")) {
1512                 opt_tab_size = parse_int(argv[2], opt_tab_size, 1, 1024);
1513                 return OK;
1514         }
1515
1516         if (!strcmp(argv[0], "commit-encoding")) {
1517                 const char *arg = argv[2];
1518                 int arglen = strlen(arg);
1519
1520                 switch (arg[0]) {
1521                 case '"':
1522                 case '\'':
1523                         if (arglen == 1 || arg[arglen - 1] != arg[0]) {
1524                                 config_msg = "Unmatched quotation";
1525                                 return ERR;
1526                         }
1527                         arg += 1; arglen -= 2;
1528                 default:
1529                         string_ncopy(opt_encoding, arg, strlen(arg));
1530                         return OK;
1531                 }
1532         }
1533
1534         config_msg = "Unknown variable name";
1535         return ERR;
1536 }
1537
1538 /* Wants: mode request key */
1539 static int
1540 option_bind_command(int argc, const char *argv[])
1541 {
1542         enum request request;
1543         int keymap;
1544         int key;
1545
1546         if (argc < 3) {
1547                 config_msg = "Wrong number of arguments given to bind command";
1548                 return ERR;
1549         }
1550
1551         if (set_keymap(&keymap, argv[0]) == ERR) {
1552                 config_msg = "Unknown key map";
1553                 return ERR;
1554         }
1555
1556         key = get_key_value(argv[1]);
1557         if (key == ERR) {
1558                 config_msg = "Unknown key";
1559                 return ERR;
1560         }
1561
1562         request = get_request(argv[2]);
1563         if (request == REQ_NONE) {
1564                 struct {
1565                         const char *name;
1566                         enum request request;
1567                 } obsolete[] = {
1568                         { "cherry-pick",        REQ_NONE },
1569                         { "screen-resize",      REQ_NONE },
1570                         { "tree-parent",        REQ_PARENT },
1571                 };
1572                 size_t namelen = strlen(argv[2]);
1573                 int i;
1574
1575                 for (i = 0; i < ARRAY_SIZE(obsolete); i++) {
1576                         if (namelen != strlen(obsolete[i].name) ||
1577                             string_enum_compare(obsolete[i].name, argv[2], namelen))
1578                                 continue;
1579                         if (obsolete[i].request != REQ_NONE)
1580                                 add_keybinding(keymap, obsolete[i].request, key);
1581                         config_msg = "Obsolete request name";
1582                         return ERR;
1583                 }
1584         }
1585         if (request == REQ_NONE && *argv[2]++ == '!')
1586                 request = add_run_request(keymap, key, argc - 2, argv + 2);
1587         if (request == REQ_NONE) {
1588                 config_msg = "Unknown request name";
1589                 return ERR;
1590         }
1591
1592         add_keybinding(keymap, request, key);
1593
1594         return OK;
1595 }
1596
1597 static int
1598 set_option(const char *opt, char *value)
1599 {
1600         const char *argv[SIZEOF_ARG];
1601         int argc = 0;
1602
1603         if (!argv_from_string(argv, &argc, value)) {
1604                 config_msg = "Too many option arguments";
1605                 return ERR;
1606         }
1607
1608         if (!strcmp(opt, "color"))
1609                 return option_color_command(argc, argv);
1610
1611         if (!strcmp(opt, "set"))
1612                 return option_set_command(argc, argv);
1613
1614         if (!strcmp(opt, "bind"))
1615                 return option_bind_command(argc, argv);
1616
1617         config_msg = "Unknown option command";
1618         return ERR;
1619 }
1620
1621 static int
1622 read_option(char *opt, size_t optlen, char *value, size_t valuelen)
1623 {
1624         int status = OK;
1625
1626         config_lineno++;
1627         config_msg = "Internal error";
1628
1629         /* Check for comment markers, since read_properties() will
1630          * only ensure opt and value are split at first " \t". */
1631         optlen = strcspn(opt, "#");
1632         if (optlen == 0)
1633                 return OK;
1634
1635         if (opt[optlen] != 0) {
1636                 config_msg = "No option value";
1637                 status = ERR;
1638
1639         }  else {
1640                 /* Look for comment endings in the value. */
1641                 size_t len = strcspn(value, "#");
1642
1643                 if (len < valuelen) {
1644                         valuelen = len;
1645                         value[valuelen] = 0;
1646                 }
1647
1648                 status = set_option(opt, value);
1649         }
1650
1651         if (status == ERR) {
1652                 fprintf(stderr, "Error on line %d, near '%.*s': %s\n",
1653                         config_lineno, (int) optlen, opt, config_msg);
1654                 config_errors = TRUE;
1655         }
1656
1657         /* Always keep going if errors are encountered. */
1658         return OK;
1659 }
1660
1661 static void
1662 load_option_file(const char *path)
1663 {
1664         struct io io = {};
1665
1666         /* It's ok that the file doesn't exist. */
1667         if (!io_open(&io, path))
1668                 return;
1669
1670         config_lineno = 0;
1671         config_errors = FALSE;
1672
1673         if (read_properties(&io, " \t", read_option) == ERR ||
1674             config_errors == TRUE)
1675                 fprintf(stderr, "Errors while loading %s.\n", path);
1676 }
1677
1678 static int
1679 load_options(void)
1680 {
1681         const char *home = getenv("HOME");
1682         const char *tigrc_user = getenv("TIGRC_USER");
1683         const char *tigrc_system = getenv("TIGRC_SYSTEM");
1684         char buf[SIZEOF_STR];
1685
1686         add_builtin_run_requests();
1687
1688         if (!tigrc_system) {
1689                 if (!string_format(buf, "%s/tigrc", SYSCONFDIR))
1690                         return ERR;
1691                 tigrc_system = buf;
1692         }
1693         load_option_file(tigrc_system);
1694
1695         if (!tigrc_user) {
1696                 if (!home || !string_format(buf, "%s/.tigrc", home))
1697                         return ERR;
1698                 tigrc_user = buf;
1699         }
1700         load_option_file(tigrc_user);
1701
1702         return OK;
1703 }
1704
1705
1706 /*
1707  * The viewer
1708  */
1709
1710 struct view;
1711 struct view_ops;
1712
1713 /* The display array of active views and the index of the current view. */
1714 static struct view *display[2];
1715 static unsigned int current_view;
1716
1717 #define foreach_displayed_view(view, i) \
1718         for (i = 0; i < ARRAY_SIZE(display) && (view = display[i]); i++)
1719
1720 #define displayed_views()       (display[1] != NULL ? 2 : 1)
1721
1722 /* Current head and commit ID */
1723 static char ref_blob[SIZEOF_REF]        = "";
1724 static char ref_commit[SIZEOF_REF]      = "HEAD";
1725 static char ref_head[SIZEOF_REF]        = "HEAD";
1726
1727 struct view {
1728         const char *name;       /* View name */
1729         const char *cmd_env;    /* Command line set via environment */
1730         const char *id;         /* Points to either of ref_{head,commit,blob} */
1731
1732         struct view_ops *ops;   /* View operations */
1733
1734         enum keymap keymap;     /* What keymap does this view have */
1735         bool git_dir;           /* Whether the view requires a git directory. */
1736
1737         char ref[SIZEOF_REF];   /* Hovered commit reference */
1738         char vid[SIZEOF_REF];   /* View ID. Set to id member when updating. */
1739
1740         int height, width;      /* The width and height of the main window */
1741         WINDOW *win;            /* The main window */
1742         WINDOW *title;          /* The title window living below the main window */
1743
1744         /* Navigation */
1745         unsigned long offset;   /* Offset of the window top */
1746         unsigned long lineno;   /* Current line number */
1747         unsigned long p_offset; /* Previous offset of the window top */
1748         unsigned long p_lineno; /* Previous current line number */
1749         bool p_restore;         /* Should the previous position be restored. */
1750
1751         /* Searching */
1752         char grep[SIZEOF_STR];  /* Search string */
1753         regex_t *regex;         /* Pre-compiled regex */
1754
1755         /* If non-NULL, points to the view that opened this view. If this view
1756          * is closed tig will switch back to the parent view. */
1757         struct view *parent;
1758
1759         /* Buffering */
1760         size_t lines;           /* Total number of lines */
1761         struct line *line;      /* Line index */
1762         size_t line_alloc;      /* Total number of allocated lines */
1763         unsigned int digits;    /* Number of digits in the lines member. */
1764
1765         /* Drawing */
1766         struct line *curline;   /* Line currently being drawn. */
1767         enum line_type curtype; /* Attribute currently used for drawing. */
1768         unsigned long col;      /* Column when drawing. */
1769
1770         /* Loading */
1771         struct io io;
1772         struct io *pipe;
1773         time_t start_time;
1774         time_t update_secs;
1775 };
1776
1777 struct view_ops {
1778         /* What type of content being displayed. Used in the title bar. */
1779         const char *type;
1780         /* Default command arguments. */
1781         const char **argv;
1782         /* Open and reads in all view content. */
1783         bool (*open)(struct view *view);
1784         /* Read one line; updates view->line. */
1785         bool (*read)(struct view *view, char *data);
1786         /* Draw one line; @lineno must be < view->height. */
1787         bool (*draw)(struct view *view, struct line *line, unsigned int lineno);
1788         /* Depending on view handle a special requests. */
1789         enum request (*request)(struct view *view, enum request request, struct line *line);
1790         /* Search for regex in a line. */
1791         bool (*grep)(struct view *view, struct line *line);
1792         /* Select line */
1793         void (*select)(struct view *view, struct line *line);
1794 };
1795
1796 static struct view_ops blame_ops;
1797 static struct view_ops blob_ops;
1798 static struct view_ops diff_ops;
1799 static struct view_ops help_ops;
1800 static struct view_ops log_ops;
1801 static struct view_ops main_ops;
1802 static struct view_ops pager_ops;
1803 static struct view_ops stage_ops;
1804 static struct view_ops status_ops;
1805 static struct view_ops tree_ops;
1806
1807 #define VIEW_STR(name, env, ref, ops, map, git) \
1808         { name, #env, ref, ops, map, git }
1809
1810 #define VIEW_(id, name, ops, git, ref) \
1811         VIEW_STR(name, TIG_##id##_CMD, ref, ops, KEYMAP_##id, git)
1812
1813
1814 static struct view views[] = {
1815         VIEW_(MAIN,   "main",   &main_ops,   TRUE,  ref_head),
1816         VIEW_(DIFF,   "diff",   &diff_ops,   TRUE,  ref_commit),
1817         VIEW_(LOG,    "log",    &log_ops,    TRUE,  ref_head),
1818         VIEW_(TREE,   "tree",   &tree_ops,   TRUE,  ref_commit),
1819         VIEW_(BLOB,   "blob",   &blob_ops,   TRUE,  ref_blob),
1820         VIEW_(BLAME,  "blame",  &blame_ops,  TRUE,  ref_commit),
1821         VIEW_(HELP,   "help",   &help_ops,   FALSE, ""),
1822         VIEW_(PAGER,  "pager",  &pager_ops,  FALSE, "stdin"),
1823         VIEW_(STATUS, "status", &status_ops, TRUE,  ""),
1824         VIEW_(STAGE,  "stage",  &stage_ops,  TRUE,  ""),
1825 };
1826
1827 #define VIEW(req)       (&views[(req) - REQ_OFFSET - 1])
1828 #define VIEW_REQ(view)  ((view) - views + REQ_OFFSET + 1)
1829
1830 #define foreach_view(view, i) \
1831         for (i = 0; i < ARRAY_SIZE(views) && (view = &views[i]); i++)
1832
1833 #define view_is_displayed(view) \
1834         (view == display[0] || view == display[1])
1835
1836
1837 enum line_graphic {
1838         LINE_GRAPHIC_VLINE
1839 };
1840
1841 static int line_graphics[] = {
1842         /* LINE_GRAPHIC_VLINE: */ '|'
1843 };
1844
1845 static inline void
1846 set_view_attr(struct view *view, enum line_type type)
1847 {
1848         if (!view->curline->selected && view->curtype != type) {
1849                 wattrset(view->win, get_line_attr(type));
1850                 wchgat(view->win, -1, 0, type, NULL);
1851                 view->curtype = type;
1852         }
1853 }
1854
1855 static int
1856 draw_chars(struct view *view, enum line_type type, const char *string,
1857            int max_len, bool use_tilde)
1858 {
1859         int len = 0;
1860         int col = 0;
1861         int trimmed = FALSE;
1862
1863         if (max_len <= 0)
1864                 return 0;
1865
1866         if (opt_utf8) {
1867                 len = utf8_length(string, &col, max_len, &trimmed, use_tilde);
1868         } else {
1869                 col = len = strlen(string);
1870                 if (len > max_len) {
1871                         if (use_tilde) {
1872                                 max_len -= 1;
1873                         }
1874                         col = len = max_len;
1875                         trimmed = TRUE;
1876                 }
1877         }
1878
1879         set_view_attr(view, type);
1880         waddnstr(view->win, string, len);
1881         if (trimmed && use_tilde) {
1882                 set_view_attr(view, LINE_DELIMITER);
1883                 waddch(view->win, '~');
1884                 col++;
1885         }
1886
1887         return col;
1888 }
1889
1890 static int
1891 draw_space(struct view *view, enum line_type type, int max, int spaces)
1892 {
1893         static char space[] = "                    ";
1894         int col = 0;
1895
1896         spaces = MIN(max, spaces);
1897
1898         while (spaces > 0) {
1899                 int len = MIN(spaces, sizeof(space) - 1);
1900
1901                 col += draw_chars(view, type, space, spaces, FALSE);
1902                 spaces -= len;
1903         }
1904
1905         return col;
1906 }
1907
1908 static bool
1909 draw_lineno(struct view *view, unsigned int lineno)
1910 {
1911         char number[10];
1912         int digits3 = view->digits < 3 ? 3 : view->digits;
1913         int max_number = MIN(digits3, STRING_SIZE(number));
1914         int max = view->width - view->col;
1915         int col;
1916
1917         if (max < max_number)
1918                 max_number = max;
1919
1920         lineno += view->offset + 1;
1921         if (lineno == 1 || (lineno % opt_num_interval) == 0) {
1922                 static char fmt[] = "%1ld";
1923
1924                 if (view->digits <= 9)
1925                         fmt[1] = '0' + digits3;
1926
1927                 if (!string_format(number, fmt, lineno))
1928                         number[0] = 0;
1929                 col = draw_chars(view, LINE_LINE_NUMBER, number, max_number, TRUE);
1930         } else {
1931                 col = draw_space(view, LINE_LINE_NUMBER, max_number, max_number);
1932         }
1933
1934         if (col < max) {
1935                 set_view_attr(view, LINE_DEFAULT);
1936                 waddch(view->win, line_graphics[LINE_GRAPHIC_VLINE]);
1937                 col++;
1938         }
1939
1940         if (col < max)
1941                 col += draw_space(view, LINE_DEFAULT, max - col, 1);
1942         view->col += col;
1943
1944         return view->width - view->col <= 0;
1945 }
1946
1947 static bool
1948 draw_text(struct view *view, enum line_type type, const char *string, bool trim)
1949 {
1950         view->col += draw_chars(view, type, string, view->width - view->col, trim);
1951         return view->width - view->col <= 0;
1952 }
1953
1954 static bool
1955 draw_graphic(struct view *view, enum line_type type, chtype graphic[], size_t size)
1956 {
1957         int max = view->width - view->col;
1958         int i;
1959
1960         if (max < size)
1961                 size = max;
1962
1963         set_view_attr(view, type);
1964         /* Using waddch() instead of waddnstr() ensures that
1965          * they'll be rendered correctly for the cursor line. */
1966         for (i = 0; i < size; i++)
1967                 waddch(view->win, graphic[i]);
1968
1969         view->col += size;
1970         if (size < max) {
1971                 waddch(view->win, ' ');
1972                 view->col++;
1973         }
1974
1975         return view->width - view->col <= 0;
1976 }
1977
1978 static bool
1979 draw_field(struct view *view, enum line_type type, const char *text, int len, bool trim)
1980 {
1981         int max = MIN(view->width - view->col, len);
1982         int col;
1983
1984         if (text)
1985                 col = draw_chars(view, type, text, max - 1, trim);
1986         else
1987                 col = draw_space(view, type, max - 1, max - 1);
1988
1989         view->col += col + draw_space(view, LINE_DEFAULT, max - col, max - col);
1990         return view->width - view->col <= 0;
1991 }
1992
1993 static bool
1994 draw_date(struct view *view, struct tm *time)
1995 {
1996         char buf[DATE_COLS];
1997         char *date;
1998         int timelen = 0;
1999
2000         if (time)
2001                 timelen = strftime(buf, sizeof(buf), DATE_FORMAT, time);
2002         date = timelen ? buf : NULL;
2003
2004         return draw_field(view, LINE_DATE, date, DATE_COLS, FALSE);
2005 }
2006
2007 static bool
2008 draw_author(struct view *view, const char *author)
2009 {
2010         bool trim = opt_author_cols == 0 || opt_author_cols > 5 || !author;
2011
2012         if (!trim) {
2013                 static char initials[10];
2014                 size_t pos;
2015
2016 #define is_initial_sep(c) (isspace(c) || ispunct(c) || (c) == '@')
2017
2018                 memset(initials, 0, sizeof(initials));
2019                 for (pos = 0; *author && pos < opt_author_cols - 1; author++, pos++) {
2020                         while (is_initial_sep(*author))
2021                                 author++;
2022                         strncpy(&initials[pos], author, sizeof(initials) - 1 - pos);
2023                         while (*author && !is_initial_sep(author[1]))
2024                                 author++;
2025                 }
2026
2027                 author = initials;
2028         }
2029
2030         return draw_field(view, LINE_MAIN_AUTHOR, author, opt_author_cols, trim);
2031 }
2032
2033 static bool
2034 draw_view_line(struct view *view, unsigned int lineno)
2035 {
2036         struct line *line;
2037         bool selected = (view->offset + lineno == view->lineno);
2038
2039         assert(view_is_displayed(view));
2040
2041         if (view->offset + lineno >= view->lines)
2042                 return FALSE;
2043
2044         line = &view->line[view->offset + lineno];
2045
2046         wmove(view->win, lineno, 0);
2047         if (line->cleareol)
2048                 wclrtoeol(view->win);
2049         view->col = 0;
2050         view->curline = line;
2051         view->curtype = LINE_NONE;
2052         line->selected = FALSE;
2053         line->dirty = line->cleareol = 0;
2054
2055         if (selected) {
2056                 set_view_attr(view, LINE_CURSOR);
2057                 line->selected = TRUE;
2058                 view->ops->select(view, line);
2059         }
2060
2061         return view->ops->draw(view, line, lineno);
2062 }
2063
2064 static void
2065 redraw_view_dirty(struct view *view)
2066 {
2067         bool dirty = FALSE;
2068         int lineno;
2069
2070         for (lineno = 0; lineno < view->height; lineno++) {
2071                 if (view->offset + lineno >= view->lines)
2072                         break;
2073                 if (!view->line[view->offset + lineno].dirty)
2074                         continue;
2075                 dirty = TRUE;
2076                 if (!draw_view_line(view, lineno))
2077                         break;
2078         }
2079
2080         if (!dirty)
2081                 return;
2082         wnoutrefresh(view->win);
2083 }
2084
2085 static void
2086 redraw_view_from(struct view *view, int lineno)
2087 {
2088         assert(0 <= lineno && lineno < view->height);
2089
2090         for (; lineno < view->height; lineno++) {
2091                 if (!draw_view_line(view, lineno))
2092                         break;
2093         }
2094
2095         wnoutrefresh(view->win);
2096 }
2097
2098 static void
2099 redraw_view(struct view *view)
2100 {
2101         werase(view->win);
2102         redraw_view_from(view, 0);
2103 }
2104
2105
2106 static void
2107 update_display_cursor(struct view *view)
2108 {
2109         /* Move the cursor to the right-most column of the cursor line.
2110          *
2111          * XXX: This could turn out to be a bit expensive, but it ensures that
2112          * the cursor does not jump around. */
2113         if (view->lines) {
2114                 wmove(view->win, view->lineno - view->offset, view->width - 1);
2115                 wnoutrefresh(view->win);
2116         }
2117 }
2118
2119 static void
2120 update_view_title(struct view *view)
2121 {
2122         char buf[SIZEOF_STR];
2123         char state[SIZEOF_STR];
2124         size_t bufpos = 0, statelen = 0;
2125
2126         assert(view_is_displayed(view));
2127
2128         if (view != VIEW(REQ_VIEW_STATUS) && view->lines) {
2129                 unsigned int view_lines = view->offset + view->height;
2130                 unsigned int lines = view->lines
2131                                    ? MIN(view_lines, view->lines) * 100 / view->lines
2132                                    : 0;
2133
2134                 string_format_from(state, &statelen, " - %s %d of %d (%d%%)",
2135                                    view->ops->type,
2136                                    view->lineno + 1,
2137                                    view->lines,
2138                                    lines);
2139
2140         }
2141
2142         if (view->pipe) {
2143                 time_t secs = time(NULL) - view->start_time;
2144
2145                 /* Three git seconds are a long time ... */
2146                 if (secs > 2)
2147                         string_format_from(state, &statelen, " loading %lds", secs);
2148         }
2149
2150         string_format_from(buf, &bufpos, "[%s]", view->name);
2151         if (*view->ref && bufpos < view->width) {
2152                 size_t refsize = strlen(view->ref);
2153                 size_t minsize = bufpos + 1 + /* abbrev= */ 7 + 1 + statelen;
2154
2155                 if (minsize < view->width)
2156                         refsize = view->width - minsize + 7;
2157                 string_format_from(buf, &bufpos, " %.*s", (int) refsize, view->ref);
2158         }
2159
2160         if (statelen && bufpos < view->width) {
2161                 string_format_from(buf, &bufpos, "%s", state);
2162         }
2163
2164         if (view == display[current_view])
2165                 wbkgdset(view->title, get_line_attr(LINE_TITLE_FOCUS));
2166         else
2167                 wbkgdset(view->title, get_line_attr(LINE_TITLE_BLUR));
2168
2169         mvwaddnstr(view->title, 0, 0, buf, bufpos);
2170         wclrtoeol(view->title);
2171         wmove(view->title, 0, view->width - 1);
2172         wnoutrefresh(view->title);
2173 }
2174
2175 static void
2176 resize_display(void)
2177 {
2178         int offset, i;
2179         struct view *base = display[0];
2180         struct view *view = display[1] ? display[1] : display[0];
2181
2182         /* Setup window dimensions */
2183
2184         getmaxyx(stdscr, base->height, base->width);
2185
2186         /* Make room for the status window. */
2187         base->height -= 1;
2188
2189         if (view != base) {
2190                 /* Horizontal split. */
2191                 view->width   = base->width;
2192                 view->height  = SCALE_SPLIT_VIEW(base->height);
2193                 base->height -= view->height;
2194
2195                 /* Make room for the title bar. */
2196                 view->height -= 1;
2197         }
2198
2199         /* Make room for the title bar. */
2200         base->height -= 1;
2201
2202         offset = 0;
2203
2204         foreach_displayed_view (view, i) {
2205                 if (!view->win) {
2206                         view->win = newwin(view->height, 0, offset, 0);
2207                         if (!view->win)
2208                                 die("Failed to create %s view", view->name);
2209
2210                         scrollok(view->win, FALSE);
2211
2212                         view->title = newwin(1, 0, offset + view->height, 0);
2213                         if (!view->title)
2214                                 die("Failed to create title window");
2215
2216                 } else {
2217                         wresize(view->win, view->height, view->width);
2218                         mvwin(view->win,   offset, 0);
2219                         mvwin(view->title, offset + view->height, 0);
2220                 }
2221
2222                 offset += view->height + 1;
2223         }
2224 }
2225
2226 static void
2227 redraw_display(bool clear)
2228 {
2229         struct view *view;
2230         int i;
2231
2232         foreach_displayed_view (view, i) {
2233                 if (clear)
2234                         wclear(view->win);
2235                 redraw_view(view);
2236                 update_view_title(view);
2237         }
2238
2239         if (display[current_view])
2240                 update_display_cursor(display[current_view]);
2241 }
2242
2243 static void
2244 toggle_view_option(bool *option, const char *help)
2245 {
2246         *option = !*option;
2247         redraw_display(FALSE);
2248         report("%sabling %s", *option ? "En" : "Dis", help);
2249 }
2250
2251 /*
2252  * Navigation
2253  */
2254
2255 /* Scrolling backend */
2256 static void
2257 do_scroll_view(struct view *view, int lines)
2258 {
2259         bool redraw_current_line = FALSE;
2260
2261         /* The rendering expects the new offset. */
2262         view->offset += lines;
2263
2264         assert(0 <= view->offset && view->offset < view->lines);
2265         assert(lines);
2266
2267         /* Move current line into the view. */
2268         if (view->lineno < view->offset) {
2269                 view->lineno = view->offset;
2270                 redraw_current_line = TRUE;
2271         } else if (view->lineno >= view->offset + view->height) {
2272                 view->lineno = view->offset + view->height - 1;
2273                 redraw_current_line = TRUE;
2274         }
2275
2276         assert(view->offset <= view->lineno && view->lineno < view->lines);
2277
2278         /* Redraw the whole screen if scrolling is pointless. */
2279         if (view->height < ABS(lines)) {
2280                 redraw_view(view);
2281
2282         } else {
2283                 int line = lines > 0 ? view->height - lines : 0;
2284                 int end = line + ABS(lines);
2285
2286                 scrollok(view->win, TRUE);
2287                 wscrl(view->win, lines);
2288                 scrollok(view->win, FALSE);
2289
2290                 while (line < end && draw_view_line(view, line))
2291                         line++;
2292
2293                 if (redraw_current_line)
2294                         draw_view_line(view, view->lineno - view->offset);
2295                 wnoutrefresh(view->win);
2296         }
2297
2298         report("");
2299 }
2300
2301 /* Scroll frontend */
2302 static void
2303 scroll_view(struct view *view, enum request request)
2304 {
2305         int lines = 1;
2306
2307         assert(view_is_displayed(view));
2308
2309         switch (request) {
2310         case REQ_SCROLL_PAGE_DOWN:
2311                 lines = view->height;
2312         case REQ_SCROLL_LINE_DOWN:
2313                 if (view->offset + lines > view->lines)
2314                         lines = view->lines - view->offset;
2315
2316                 if (lines == 0 || view->offset + view->height >= view->lines) {
2317                         report("Cannot scroll beyond the last line");
2318                         return;
2319                 }
2320                 break;
2321
2322         case REQ_SCROLL_PAGE_UP:
2323                 lines = view->height;
2324         case REQ_SCROLL_LINE_UP:
2325                 if (lines > view->offset)
2326                         lines = view->offset;
2327
2328                 if (lines == 0) {
2329                         report("Cannot scroll beyond the first line");
2330                         return;
2331                 }
2332
2333                 lines = -lines;
2334                 break;
2335
2336         default:
2337                 die("request %d not handled in switch", request);
2338         }
2339
2340         do_scroll_view(view, lines);
2341 }
2342
2343 /* Cursor moving */
2344 static void
2345 move_view(struct view *view, enum request request)
2346 {
2347         int scroll_steps = 0;
2348         int steps;
2349
2350         switch (request) {
2351         case REQ_MOVE_FIRST_LINE:
2352                 steps = -view->lineno;
2353                 break;
2354
2355         case REQ_MOVE_LAST_LINE:
2356                 steps = view->lines - view->lineno - 1;
2357                 break;
2358
2359         case REQ_MOVE_PAGE_UP:
2360                 steps = view->height > view->lineno
2361                       ? -view->lineno : -view->height;
2362                 break;
2363
2364         case REQ_MOVE_PAGE_DOWN:
2365                 steps = view->lineno + view->height >= view->lines
2366                       ? view->lines - view->lineno - 1 : view->height;
2367                 break;
2368
2369         case REQ_MOVE_UP:
2370                 steps = -1;
2371                 break;
2372
2373         case REQ_MOVE_DOWN:
2374                 steps = 1;
2375                 break;
2376
2377         default:
2378                 die("request %d not handled in switch", request);
2379         }
2380
2381         if (steps <= 0 && view->lineno == 0) {
2382                 report("Cannot move beyond the first line");
2383                 return;
2384
2385         } else if (steps >= 0 && view->lineno + 1 >= view->lines) {
2386                 report("Cannot move beyond the last line");
2387                 return;
2388         }
2389
2390         /* Move the current line */
2391         view->lineno += steps;
2392         assert(0 <= view->lineno && view->lineno < view->lines);
2393
2394         /* Check whether the view needs to be scrolled */
2395         if (view->lineno < view->offset ||
2396             view->lineno >= view->offset + view->height) {
2397                 scroll_steps = steps;
2398                 if (steps < 0 && -steps > view->offset) {
2399                         scroll_steps = -view->offset;
2400
2401                 } else if (steps > 0) {
2402                         if (view->lineno == view->lines - 1 &&
2403                             view->lines > view->height) {
2404                                 scroll_steps = view->lines - view->offset - 1;
2405                                 if (scroll_steps >= view->height)
2406                                         scroll_steps -= view->height - 1;
2407                         }
2408                 }
2409         }
2410
2411         if (!view_is_displayed(view)) {
2412                 view->offset += scroll_steps;
2413                 assert(0 <= view->offset && view->offset < view->lines);
2414                 view->ops->select(view, &view->line[view->lineno]);
2415                 return;
2416         }
2417
2418         /* Repaint the old "current" line if we be scrolling */
2419         if (ABS(steps) < view->height)
2420                 draw_view_line(view, view->lineno - steps - view->offset);
2421
2422         if (scroll_steps) {
2423                 do_scroll_view(view, scroll_steps);
2424                 return;
2425         }
2426
2427         /* Draw the current line */
2428         draw_view_line(view, view->lineno - view->offset);
2429
2430         wnoutrefresh(view->win);
2431         report("");
2432 }
2433
2434
2435 /*
2436  * Searching
2437  */
2438
2439 static void search_view(struct view *view, enum request request);
2440
2441 static void
2442 select_view_line(struct view *view, unsigned long lineno)
2443 {
2444         if (lineno - view->offset >= view->height) {
2445                 view->offset = lineno;
2446                 view->lineno = lineno;
2447                 if (view_is_displayed(view))
2448                         redraw_view(view);
2449
2450         } else {
2451                 unsigned long old_lineno = view->lineno - view->offset;
2452
2453                 view->lineno = lineno;
2454                 if (view_is_displayed(view)) {
2455                         draw_view_line(view, old_lineno);
2456                         draw_view_line(view, view->lineno - view->offset);
2457                         wnoutrefresh(view->win);
2458                 } else {
2459                         view->ops->select(view, &view->line[view->lineno]);
2460                 }
2461         }
2462 }
2463
2464 static void
2465 find_next(struct view *view, enum request request)
2466 {
2467         unsigned long lineno = view->lineno;
2468         int direction;
2469
2470         if (!*view->grep) {
2471                 if (!*opt_search)
2472                         report("No previous search");
2473                 else
2474                         search_view(view, request);
2475                 return;
2476         }
2477
2478         switch (request) {
2479         case REQ_SEARCH:
2480         case REQ_FIND_NEXT:
2481                 direction = 1;
2482                 break;
2483
2484         case REQ_SEARCH_BACK:
2485         case REQ_FIND_PREV:
2486                 direction = -1;
2487                 break;
2488
2489         default:
2490                 return;
2491         }
2492
2493         if (request == REQ_FIND_NEXT || request == REQ_FIND_PREV)
2494                 lineno += direction;
2495
2496         /* Note, lineno is unsigned long so will wrap around in which case it
2497          * will become bigger than view->lines. */
2498         for (; lineno < view->lines; lineno += direction) {
2499                 if (view->ops->grep(view, &view->line[lineno])) {
2500                         select_view_line(view, lineno);
2501                         report("Line %ld matches '%s'", lineno + 1, view->grep);
2502                         return;
2503                 }
2504         }
2505
2506         report("No match found for '%s'", view->grep);
2507 }
2508
2509 static void
2510 search_view(struct view *view, enum request request)
2511 {
2512         int regex_err;
2513
2514         if (view->regex) {
2515                 regfree(view->regex);
2516                 *view->grep = 0;
2517         } else {
2518                 view->regex = calloc(1, sizeof(*view->regex));
2519                 if (!view->regex)
2520                         return;
2521         }
2522
2523         regex_err = regcomp(view->regex, opt_search, REG_EXTENDED);
2524         if (regex_err != 0) {
2525                 char buf[SIZEOF_STR] = "unknown error";
2526
2527                 regerror(regex_err, view->regex, buf, sizeof(buf));
2528                 report("Search failed: %s", buf);
2529                 return;
2530         }
2531
2532         string_copy(view->grep, opt_search);
2533
2534         find_next(view, request);
2535 }
2536
2537 /*
2538  * Incremental updating
2539  */
2540
2541 static void
2542 reset_view(struct view *view)
2543 {
2544         int i;
2545
2546         for (i = 0; i < view->lines; i++)
2547                 free(view->line[i].data);
2548         free(view->line);
2549
2550         view->p_offset = view->offset;
2551         view->p_lineno = view->lineno;
2552
2553         view->line = NULL;
2554         view->offset = 0;
2555         view->lines  = 0;
2556         view->lineno = 0;
2557         view->line_alloc = 0;
2558         view->vid[0] = 0;
2559         view->update_secs = 0;
2560 }
2561
2562 static void
2563 free_argv(const char *argv[])
2564 {
2565         int argc;
2566
2567         for (argc = 0; argv[argc]; argc++)
2568                 free((void *) argv[argc]);
2569 }
2570
2571 static bool
2572 format_argv(const char *dst_argv[], const char *src_argv[], enum format_flags flags)
2573 {
2574         char buf[SIZEOF_STR];
2575         int argc;
2576         bool noreplace = flags == FORMAT_NONE;
2577
2578         free_argv(dst_argv);
2579
2580         for (argc = 0; src_argv[argc]; argc++) {
2581                 const char *arg = src_argv[argc];
2582                 size_t bufpos = 0;
2583
2584                 while (arg) {
2585                         char *next = strstr(arg, "%(");
2586                         int len = next - arg;
2587                         const char *value;
2588
2589                         if (!next || noreplace) {
2590                                 if (flags == FORMAT_DASH && !strcmp(arg, "--"))
2591                                         noreplace = TRUE;
2592                                 len = strlen(arg);
2593                                 value = "";
2594
2595                         } else if (!prefixcmp(next, "%(directory)")) {
2596                                 value = opt_path;
2597
2598                         } else if (!prefixcmp(next, "%(file)")) {
2599                                 value = opt_file;
2600
2601                         } else if (!prefixcmp(next, "%(ref)")) {
2602                                 value = *opt_ref ? opt_ref : "HEAD";
2603
2604                         } else if (!prefixcmp(next, "%(head)")) {
2605                                 value = ref_head;
2606
2607                         } else if (!prefixcmp(next, "%(commit)")) {
2608                                 value = ref_commit;
2609
2610                         } else if (!prefixcmp(next, "%(blob)")) {
2611                                 value = ref_blob;
2612
2613                         } else {
2614                                 report("Unknown replacement: `%s`", next);
2615                                 return FALSE;
2616                         }
2617
2618                         if (!string_format_from(buf, &bufpos, "%.*s%s", len, arg, value))
2619                                 return FALSE;
2620
2621                         arg = next && !noreplace ? strchr(next, ')') + 1 : NULL;
2622                 }
2623
2624                 dst_argv[argc] = strdup(buf);
2625                 if (!dst_argv[argc])
2626                         break;
2627         }
2628
2629         dst_argv[argc] = NULL;
2630
2631         return src_argv[argc] == NULL;
2632 }
2633
2634 static bool
2635 restore_view_position(struct view *view)
2636 {
2637         if (!view->p_restore || (view->pipe && view->lines <= view->p_lineno))
2638                 return FALSE;
2639
2640         /* Changing the view position cancels the restoring. */
2641         /* FIXME: Changing back to the first line is not detected. */
2642         if (view->offset != 0 || view->lineno != 0) {
2643                 view->p_restore = FALSE;
2644                 return FALSE;
2645         }
2646
2647         if (view->p_lineno >= view->lines) {
2648                 view->p_lineno = view->lines > 0 ? view->lines - 1 : 0;
2649                 if (view->p_offset >= view->p_lineno) {
2650                         unsigned long half = view->height / 2;
2651
2652                         if (view->p_lineno > half)
2653                                 view->p_offset = view->p_lineno - half;
2654                         else
2655                                 view->p_offset = 0;
2656                 }
2657         }
2658
2659         if (view_is_displayed(view) &&
2660             view->offset != view->p_offset &&
2661             view->lineno != view->p_lineno)
2662                 werase(view->win);
2663
2664         view->offset = view->p_offset;
2665         view->lineno = view->p_lineno;
2666         view->p_restore = FALSE;
2667
2668         return TRUE;
2669 }
2670
2671 static void
2672 end_update(struct view *view, bool force)
2673 {
2674         if (!view->pipe)
2675                 return;
2676         while (!view->ops->read(view, NULL))
2677                 if (!force)
2678                         return;
2679         set_nonblocking_input(FALSE);
2680         if (force)
2681                 kill_io(view->pipe);
2682         done_io(view->pipe);
2683         view->pipe = NULL;
2684 }
2685
2686 static void
2687 setup_update(struct view *view, const char *vid)
2688 {
2689         set_nonblocking_input(TRUE);
2690         reset_view(view);
2691         string_copy_rev(view->vid, vid);
2692         view->pipe = &view->io;
2693         view->start_time = time(NULL);
2694 }
2695
2696 static bool
2697 prepare_update(struct view *view, const char *argv[], const char *dir,
2698                enum format_flags flags)
2699 {
2700         if (view->pipe)
2701                 end_update(view, TRUE);
2702         return init_io_rd(&view->io, argv, dir, flags);
2703 }
2704
2705 static bool
2706 prepare_update_file(struct view *view, const char *name)
2707 {
2708         if (view->pipe)
2709                 end_update(view, TRUE);
2710         return io_open(&view->io, name);
2711 }
2712
2713 static bool
2714 begin_update(struct view *view, bool refresh)
2715 {
2716         if (view->pipe)
2717                 end_update(view, TRUE);
2718
2719         if (refresh) {
2720                 if (!start_io(&view->io))
2721                         return FALSE;
2722
2723         } else {
2724                 if (view == VIEW(REQ_VIEW_TREE) && strcmp(view->vid, view->id))
2725                         opt_path[0] = 0;
2726
2727                 if (!run_io_rd(&view->io, view->ops->argv, FORMAT_ALL))
2728                         return FALSE;
2729
2730                 /* Put the current ref_* value to the view title ref
2731                  * member. This is needed by the blob view. Most other
2732                  * views sets it automatically after loading because the
2733                  * first line is a commit line. */
2734                 string_copy_rev(view->ref, view->id);
2735         }
2736
2737         setup_update(view, view->id);
2738
2739         return TRUE;
2740 }
2741
2742 #define ITEM_CHUNK_SIZE 256
2743 static void *
2744 realloc_items(void *mem, size_t *size, size_t new_size, size_t item_size)
2745 {
2746         size_t num_chunks = *size / ITEM_CHUNK_SIZE;
2747         size_t num_chunks_new = (new_size + ITEM_CHUNK_SIZE - 1) / ITEM_CHUNK_SIZE;
2748
2749         if (mem == NULL || num_chunks != num_chunks_new) {
2750                 *size = num_chunks_new * ITEM_CHUNK_SIZE;
2751                 mem = realloc(mem, *size * item_size);
2752         }
2753
2754         return mem;
2755 }
2756
2757 static struct line *
2758 realloc_lines(struct view *view, size_t line_size)
2759 {
2760         size_t alloc = view->line_alloc;
2761         struct line *tmp = realloc_items(view->line, &alloc, line_size,
2762                                          sizeof(*view->line));
2763
2764         if (!tmp)
2765                 return NULL;
2766
2767         view->line = tmp;
2768         view->line_alloc = alloc;
2769         return view->line;
2770 }
2771
2772 static bool
2773 update_view(struct view *view)
2774 {
2775         char out_buffer[BUFSIZ * 2];
2776         char *line;
2777         /* Clear the view and redraw everything since the tree sorting
2778          * might have rearranged things. */
2779         bool redraw = view->lines == 0;
2780         bool can_read = TRUE;
2781
2782         if (!view->pipe)
2783                 return TRUE;
2784
2785         if (!io_can_read(view->pipe)) {
2786                 if (view->lines == 0) {
2787                         time_t secs = time(NULL) - view->start_time;
2788
2789                         if (secs > view->update_secs) {
2790                                 if (view->update_secs == 0)
2791                                         redraw_view(view);
2792                                 update_view_title(view);
2793                                 view->update_secs = secs;
2794                         }
2795                 }
2796                 return TRUE;
2797         }
2798
2799         for (; (line = io_get(view->pipe, '\n', can_read)); can_read = FALSE) {
2800                 if (opt_iconv != ICONV_NONE) {
2801                         ICONV_CONST char *inbuf = line;
2802                         size_t inlen = strlen(line) + 1;
2803
2804                         char *outbuf = out_buffer;
2805                         size_t outlen = sizeof(out_buffer);
2806
2807                         size_t ret;
2808
2809                         ret = iconv(opt_iconv, &inbuf, &inlen, &outbuf, &outlen);
2810                         if (ret != (size_t) -1)
2811                                 line = out_buffer;
2812                 }
2813
2814                 if (!view->ops->read(view, line)) {
2815                         report("Allocation failure");
2816                         end_update(view, TRUE);
2817                         return FALSE;
2818                 }
2819         }
2820
2821         {
2822                 unsigned long lines = view->lines;
2823                 int digits;
2824
2825                 for (digits = 0; lines; digits++)
2826                         lines /= 10;
2827
2828                 /* Keep the displayed view in sync with line number scaling. */
2829                 if (digits != view->digits) {
2830                         view->digits = digits;
2831                         if (opt_line_number || view == VIEW(REQ_VIEW_BLAME))
2832                                 redraw = TRUE;
2833                 }
2834         }
2835
2836         if (io_error(view->pipe)) {
2837                 report("Failed to read: %s", io_strerror(view->pipe));
2838                 end_update(view, TRUE);
2839
2840         } else if (io_eof(view->pipe)) {
2841                 report("");
2842                 end_update(view, FALSE);
2843         }
2844
2845         if (restore_view_position(view))
2846                 redraw = TRUE;
2847
2848         if (!view_is_displayed(view))
2849                 return TRUE;
2850
2851         if (redraw)
2852                 redraw_view_from(view, 0);
2853         else
2854                 redraw_view_dirty(view);
2855
2856         /* Update the title _after_ the redraw so that if the redraw picks up a
2857          * commit reference in view->ref it'll be available here. */
2858         update_view_title(view);
2859         update_display_cursor(view);
2860         return TRUE;
2861 }
2862
2863 static struct line *
2864 add_line_data(struct view *view, void *data, enum line_type type)
2865 {
2866         struct line *line;
2867
2868         if (!realloc_lines(view, view->lines + 1))
2869                 return NULL;
2870
2871         line = &view->line[view->lines++];
2872         memset(line, 0, sizeof(*line));
2873         line->type = type;
2874         line->data = data;
2875         line->dirty = 1;
2876
2877         return line;
2878 }
2879
2880 static struct line *
2881 add_line_text(struct view *view, const char *text, enum line_type type)
2882 {
2883         char *data = text ? strdup(text) : NULL;
2884
2885         return data ? add_line_data(view, data, type) : NULL;
2886 }
2887
2888 static struct line *
2889 add_line_format(struct view *view, enum line_type type, const char *fmt, ...)
2890 {
2891         char buf[SIZEOF_STR];
2892         va_list args;
2893
2894         va_start(args, fmt);
2895         if (vsnprintf(buf, sizeof(buf), fmt, args) >= sizeof(buf))
2896                 buf[0] = 0;
2897         va_end(args);
2898
2899         return buf[0] ? add_line_text(view, buf, type) : NULL;
2900 }
2901
2902 /*
2903  * View opening
2904  */
2905
2906 enum open_flags {
2907         OPEN_DEFAULT = 0,       /* Use default view switching. */
2908         OPEN_SPLIT = 1,         /* Split current view. */
2909         OPEN_BACKGROUNDED = 2,  /* Backgrounded. */
2910         OPEN_RELOAD = 4,        /* Reload view even if it is the current. */
2911         OPEN_NOMAXIMIZE = 8,    /* Do not maximize the current view. */
2912         OPEN_REFRESH = 16,      /* Refresh view using previous command. */
2913         OPEN_PREPARED = 32,     /* Open already prepared command. */
2914 };
2915
2916 static void
2917 open_view(struct view *prev, enum request request, enum open_flags flags)
2918 {
2919         bool backgrounded = !!(flags & OPEN_BACKGROUNDED);
2920         bool split = !!(flags & OPEN_SPLIT);
2921         bool reload = !!(flags & (OPEN_RELOAD | OPEN_REFRESH | OPEN_PREPARED));
2922         bool nomaximize = !!(flags & (OPEN_NOMAXIMIZE | OPEN_REFRESH));
2923         struct view *view = VIEW(request);
2924         int nviews = displayed_views();
2925         struct view *base_view = display[0];
2926
2927         if (view == prev && nviews == 1 && !reload) {
2928                 report("Already in %s view", view->name);
2929                 return;
2930         }
2931
2932         if (view->git_dir && !opt_git_dir[0]) {
2933                 report("The %s view is disabled in pager view", view->name);
2934                 return;
2935         }
2936
2937         if (split) {
2938                 display[1] = view;
2939                 if (!backgrounded)
2940                         current_view = 1;
2941         } else if (!nomaximize) {
2942                 /* Maximize the current view. */
2943                 memset(display, 0, sizeof(display));
2944                 current_view = 0;
2945                 display[current_view] = view;
2946         }
2947
2948         /* Resize the view when switching between split- and full-screen,
2949          * or when switching between two different full-screen views. */
2950         if (nviews != displayed_views() ||
2951             (nviews == 1 && base_view != display[0]))
2952                 resize_display();
2953
2954         if (view->ops->open) {
2955                 if (view->pipe)
2956                         end_update(view, TRUE);
2957                 if (!view->ops->open(view)) {
2958                         report("Failed to load %s view", view->name);
2959                         return;
2960                 }
2961                 restore_view_position(view);
2962
2963         } else if ((reload || strcmp(view->vid, view->id)) &&
2964                    !begin_update(view, flags & (OPEN_REFRESH | OPEN_PREPARED))) {
2965                 report("Failed to load %s view", view->name);
2966                 return;
2967         }
2968
2969         if (split && prev->lineno - prev->offset >= prev->height) {
2970                 /* Take the title line into account. */
2971                 int lines = prev->lineno - prev->offset - prev->height + 1;
2972
2973                 /* Scroll the view that was split if the current line is
2974                  * outside the new limited view. */
2975                 do_scroll_view(prev, lines);
2976         }
2977
2978         if (prev && view != prev) {
2979                 if (split && !backgrounded) {
2980                         /* "Blur" the previous view. */
2981                         update_view_title(prev);
2982                 }
2983
2984                 view->parent = prev;
2985         }
2986
2987         if (view->pipe && view->lines == 0) {
2988                 /* Clear the old view and let the incremental updating refill
2989                  * the screen. */
2990                 werase(view->win);
2991                 view->p_restore = flags & (OPEN_RELOAD | OPEN_REFRESH);
2992                 report("");
2993         } else if (view_is_displayed(view)) {
2994                 redraw_view(view);
2995                 report("");
2996         }
2997
2998         /* If the view is backgrounded the above calls to report()
2999          * won't redraw the view title. */
3000         if (backgrounded)
3001                 update_view_title(view);
3002 }
3003
3004 static void
3005 open_external_viewer(const char *argv[], const char *dir)
3006 {
3007         def_prog_mode();           /* save current tty modes */
3008         endwin();                  /* restore original tty modes */
3009         run_io_fg(argv, dir);
3010         fprintf(stderr, "Press Enter to continue");
3011         getc(opt_tty);
3012         reset_prog_mode();
3013         redraw_display(TRUE);
3014 }
3015
3016 static void
3017 open_mergetool(const char *file)
3018 {
3019         const char *mergetool_argv[] = { "git", "mergetool", file, NULL };
3020
3021         open_external_viewer(mergetool_argv, opt_cdup);
3022 }
3023
3024 static void
3025 open_editor(bool from_root, const char *file)
3026 {
3027         const char *editor_argv[] = { "vi", file, NULL };
3028         const char *editor;
3029
3030         editor = getenv("GIT_EDITOR");
3031         if (!editor && *opt_editor)
3032                 editor = opt_editor;
3033         if (!editor)
3034                 editor = getenv("VISUAL");
3035         if (!editor)
3036                 editor = getenv("EDITOR");
3037         if (!editor)
3038                 editor = "vi";
3039
3040         editor_argv[0] = editor;
3041         open_external_viewer(editor_argv, from_root ? opt_cdup : NULL);
3042 }
3043
3044 static void
3045 open_run_request(enum request request)
3046 {
3047         struct run_request *req = get_run_request(request);
3048         const char *argv[ARRAY_SIZE(req->argv)] = { NULL };
3049
3050         if (!req) {
3051                 report("Unknown run request");
3052                 return;
3053         }
3054
3055         if (format_argv(argv, req->argv, FORMAT_ALL))
3056                 open_external_viewer(argv, NULL);
3057         free_argv(argv);
3058 }
3059
3060 /*
3061  * User request switch noodle
3062  */
3063
3064 static int
3065 view_driver(struct view *view, enum request request)
3066 {
3067         int i;
3068
3069         if (request == REQ_NONE) {
3070                 doupdate();
3071                 return TRUE;
3072         }
3073
3074         if (request > REQ_NONE) {
3075                 open_run_request(request);
3076                 /* FIXME: When all views can refresh always do this. */
3077                 if (view == VIEW(REQ_VIEW_STATUS) ||
3078                     view == VIEW(REQ_VIEW_MAIN) ||
3079                     view == VIEW(REQ_VIEW_LOG) ||
3080                     view == VIEW(REQ_VIEW_STAGE))
3081                         request = REQ_REFRESH;
3082                 else
3083                         return TRUE;
3084         }
3085
3086         if (view && view->lines) {
3087                 request = view->ops->request(view, request, &view->line[view->lineno]);
3088                 if (request == REQ_NONE)
3089                         return TRUE;
3090         }
3091
3092         switch (request) {
3093         case REQ_MOVE_UP:
3094         case REQ_MOVE_DOWN:
3095         case REQ_MOVE_PAGE_UP:
3096         case REQ_MOVE_PAGE_DOWN:
3097         case REQ_MOVE_FIRST_LINE:
3098         case REQ_MOVE_LAST_LINE:
3099                 move_view(view, request);
3100                 break;
3101
3102         case REQ_SCROLL_LINE_DOWN:
3103         case REQ_SCROLL_LINE_UP:
3104         case REQ_SCROLL_PAGE_DOWN:
3105         case REQ_SCROLL_PAGE_UP:
3106                 scroll_view(view, request);
3107                 break;
3108
3109         case REQ_VIEW_BLAME:
3110                 if (!opt_file[0]) {
3111                         report("No file chosen, press %s to open tree view",
3112                                get_key(REQ_VIEW_TREE));
3113                         break;
3114                 }
3115                 open_view(view, request, OPEN_DEFAULT);
3116                 break;
3117
3118         case REQ_VIEW_BLOB:
3119                 if (!ref_blob[0]) {
3120                         report("No file chosen, press %s to open tree view",
3121                                get_key(REQ_VIEW_TREE));
3122                         break;
3123                 }
3124                 open_view(view, request, OPEN_DEFAULT);
3125                 break;
3126
3127         case REQ_VIEW_PAGER:
3128                 if (!VIEW(REQ_VIEW_PAGER)->pipe && !VIEW(REQ_VIEW_PAGER)->lines) {
3129                         report("No pager content, press %s to run command from prompt",
3130                                get_key(REQ_PROMPT));
3131                         break;
3132                 }
3133                 open_view(view, request, OPEN_DEFAULT);
3134                 break;
3135
3136         case REQ_VIEW_STAGE:
3137                 if (!VIEW(REQ_VIEW_STAGE)->lines) {
3138                         report("No stage content, press %s to open the status view and choose file",
3139                                get_key(REQ_VIEW_STATUS));
3140                         break;
3141                 }
3142                 open_view(view, request, OPEN_DEFAULT);
3143                 break;
3144
3145         case REQ_VIEW_STATUS:
3146                 if (opt_is_inside_work_tree == FALSE) {
3147                         report("The status view requires a working tree");
3148                         break;
3149                 }
3150                 open_view(view, request, OPEN_DEFAULT);
3151                 break;
3152
3153         case REQ_VIEW_MAIN:
3154         case REQ_VIEW_DIFF:
3155         case REQ_VIEW_LOG:
3156         case REQ_VIEW_TREE:
3157         case REQ_VIEW_HELP:
3158                 open_view(view, request, OPEN_DEFAULT);
3159                 break;
3160
3161         case REQ_NEXT:
3162         case REQ_PREVIOUS:
3163                 request = request == REQ_NEXT ? REQ_MOVE_DOWN : REQ_MOVE_UP;
3164
3165                 if ((view == VIEW(REQ_VIEW_DIFF) &&
3166                      view->parent == VIEW(REQ_VIEW_MAIN)) ||
3167                    (view == VIEW(REQ_VIEW_DIFF) &&
3168                      view->parent == VIEW(REQ_VIEW_BLAME)) ||
3169                    (view == VIEW(REQ_VIEW_STAGE) &&
3170                      view->parent == VIEW(REQ_VIEW_STATUS)) ||
3171                    (view == VIEW(REQ_VIEW_BLOB) &&
3172                      view->parent == VIEW(REQ_VIEW_TREE))) {
3173                         int line;
3174
3175                         view = view->parent;
3176                         line = view->lineno;
3177                         move_view(view, request);
3178                         if (view_is_displayed(view))
3179                                 update_view_title(view);
3180                         if (line != view->lineno)
3181                                 view->ops->request(view, REQ_ENTER,
3182                                                    &view->line[view->lineno]);
3183
3184                 } else {
3185                         move_view(view, request);
3186                 }
3187                 break;
3188
3189         case REQ_VIEW_NEXT:
3190         {
3191                 int nviews = displayed_views();
3192                 int next_view = (current_view + 1) % nviews;
3193
3194                 if (next_view == current_view) {
3195                         report("Only one view is displayed");
3196                         break;
3197                 }
3198
3199                 current_view = next_view;
3200                 /* Blur out the title of the previous view. */
3201                 update_view_title(view);
3202                 report("");
3203                 break;
3204         }
3205         case REQ_REFRESH:
3206                 report("Refreshing is not yet supported for the %s view", view->name);
3207                 break;
3208
3209         case REQ_MAXIMIZE:
3210                 if (displayed_views() == 2)
3211                         open_view(view, VIEW_REQ(view), OPEN_DEFAULT);
3212                 break;
3213
3214         case REQ_TOGGLE_LINENO:
3215                 toggle_view_option(&opt_line_number, "line numbers");
3216                 break;
3217
3218         case REQ_TOGGLE_DATE:
3219                 toggle_view_option(&opt_date, "date display");
3220                 break;
3221
3222         case REQ_TOGGLE_AUTHOR:
3223                 toggle_view_option(&opt_author, "author display");
3224                 break;
3225
3226         case REQ_TOGGLE_REV_GRAPH:
3227                 toggle_view_option(&opt_rev_graph, "revision graph display");
3228                 break;
3229
3230         case REQ_TOGGLE_REFS:
3231                 toggle_view_option(&opt_show_refs, "reference display");
3232                 break;
3233
3234         case REQ_SEARCH:
3235         case REQ_SEARCH_BACK:
3236                 search_view(view, request);
3237                 break;
3238
3239         case REQ_FIND_NEXT:
3240         case REQ_FIND_PREV:
3241                 find_next(view, request);
3242                 break;
3243
3244         case REQ_STOP_LOADING:
3245                 for (i = 0; i < ARRAY_SIZE(views); i++) {
3246                         view = &views[i];
3247                         if (view->pipe)
3248                                 report("Stopped loading the %s view", view->name),
3249                         end_update(view, TRUE);
3250                 }
3251                 break;
3252
3253         case REQ_SHOW_VERSION:
3254                 report("tig-%s (built %s)", TIG_VERSION, __DATE__);
3255                 return TRUE;
3256
3257         case REQ_SCREEN_REDRAW:
3258                 redraw_display(TRUE);
3259                 break;
3260
3261         case REQ_EDIT:
3262                 report("Nothing to edit");
3263                 break;
3264
3265         case REQ_ENTER:
3266                 report("Nothing to enter");
3267                 break;
3268
3269         case REQ_VIEW_CLOSE:
3270                 /* XXX: Mark closed views by letting view->parent point to the
3271                  * view itself. Parents to closed view should never be
3272                  * followed. */
3273                 if (view->parent &&
3274                     view->parent->parent != view->parent) {
3275                         memset(display, 0, sizeof(display));
3276                         current_view = 0;
3277                         display[current_view] = view->parent;
3278                         view->parent = view;
3279                         resize_display();
3280                         redraw_display(FALSE);
3281                         report("");
3282                         break;
3283                 }
3284                 /* Fall-through */
3285         case REQ_QUIT:
3286                 return FALSE;
3287
3288         default:
3289                 report("Unknown key, press 'h' for help");
3290                 return TRUE;
3291         }
3292
3293         return TRUE;
3294 }
3295
3296
3297 /*
3298  * View backend utilities
3299  */
3300
3301 /* Parse author lines where the name may be empty:
3302  *      author  <email@address.tld> 1138474660 +0100
3303  */
3304 static void
3305 parse_author_line(char *ident, char *author, size_t authorsize, struct tm *tm)
3306 {
3307         char *nameend = strchr(ident, '<');
3308         char *emailend = strchr(ident, '>');
3309
3310         if (nameend && emailend)
3311                 *nameend = *emailend = 0;
3312         ident = chomp_string(ident);
3313         if (!*ident) {
3314                 if (nameend)
3315                         ident = chomp_string(nameend + 1);
3316                 if (!*ident)
3317                         ident = "Unknown";
3318         }
3319
3320         string_ncopy_do(author, authorsize, ident, strlen(ident));
3321
3322         /* Parse epoch and timezone */
3323         if (emailend && emailend[1] == ' ') {
3324                 char *secs = emailend + 2;
3325                 char *zone = strchr(secs, ' ');
3326                 time_t time = (time_t) atol(secs);
3327
3328                 if (zone && strlen(zone) == STRING_SIZE(" +0700")) {
3329                         long tz;
3330
3331                         zone++;
3332                         tz  = ('0' - zone[1]) * 60 * 60 * 10;
3333                         tz += ('0' - zone[2]) * 60 * 60;
3334                         tz += ('0' - zone[3]) * 60;
3335                         tz += ('0' - zone[4]) * 60;
3336
3337                         if (zone[0] == '-')
3338                                 tz = -tz;
3339
3340                         time -= tz;
3341                 }
3342
3343                 gmtime_r(&time, tm);
3344         }
3345 }
3346
3347 static enum input_status
3348 select_commit_parent_handler(void *data, char *buf, int c)
3349 {
3350         size_t parents = *(size_t *) data;
3351         int parent = 0;
3352
3353         if (!isdigit(c))
3354                 return INPUT_SKIP;
3355
3356         if (*buf)
3357                 parent = atoi(buf) * 10;
3358         parent += c - '0';
3359
3360         if (parent > parents)
3361                 return INPUT_SKIP;
3362         return INPUT_OK;
3363 }
3364
3365 static bool
3366 select_commit_parent(const char *id, char rev[SIZEOF_REV])
3367 {
3368         char buf[SIZEOF_STR * 4];
3369         const char *revlist_argv[] = {
3370                 "git", "rev-list", "-1", "--parents", id, NULL
3371         };
3372         int parents;
3373
3374         if (!run_io_buf(revlist_argv, buf, sizeof(buf)) ||
3375             !*chomp_string(buf) ||
3376             (parents = (strlen(buf) / 40) - 1) < 0) {
3377                 report("Failed to get parent information");
3378                 return FALSE;
3379
3380         } else if (parents == 0) {
3381                 report("The selected commit has no parents");
3382                 return FALSE;
3383         }
3384
3385         if (parents > 1) {
3386                 char prompt[SIZEOF_STR];
3387                 char *result;
3388
3389                 if (!string_format(prompt, "Which parent? [1..%d] ", parents))
3390                         return FALSE;
3391                 result = prompt_input(prompt, select_commit_parent_handler, &parents);
3392                 if (!result)
3393                         return FALSE;
3394                 parents = atoi(result);
3395         }
3396
3397         string_copy_rev(rev, &buf[41 * parents]);
3398         return TRUE;
3399 }
3400
3401 /*
3402  * Pager backend
3403  */
3404
3405 static bool
3406 pager_draw(struct view *view, struct line *line, unsigned int lineno)
3407 {
3408         char *text = line->data;
3409
3410         if (opt_line_number && draw_lineno(view, lineno))
3411                 return TRUE;
3412
3413         draw_text(view, line->type, text, TRUE);
3414         return TRUE;
3415 }
3416
3417 static bool
3418 add_describe_ref(char *buf, size_t *bufpos, const char *commit_id, const char *sep)
3419 {
3420         const char *describe_argv[] = { "git", "describe", commit_id, NULL };
3421         char refbuf[SIZEOF_STR];
3422         char *ref = NULL;
3423
3424         if (run_io_buf(describe_argv, refbuf, sizeof(refbuf)))
3425                 ref = chomp_string(refbuf);
3426
3427         if (!ref || !*ref)
3428                 return TRUE;
3429
3430         /* This is the only fatal call, since it can "corrupt" the buffer. */
3431         if (!string_nformat(buf, SIZEOF_STR, bufpos, "%s%s", sep, ref))
3432                 return FALSE;
3433
3434         return TRUE;
3435 }
3436
3437 static void
3438 add_pager_refs(struct view *view, struct line *line)
3439 {
3440         char buf[SIZEOF_STR];
3441         char *commit_id = (char *)line->data + STRING_SIZE("commit ");
3442         struct ref **refs;
3443         size_t bufpos = 0, refpos = 0;
3444         const char *sep = "Refs: ";
3445         bool is_tag = FALSE;
3446
3447         assert(line->type == LINE_COMMIT);
3448
3449         refs = get_refs(commit_id);
3450         if (!refs) {
3451                 if (view == VIEW(REQ_VIEW_DIFF))
3452                         goto try_add_describe_ref;
3453                 return;
3454         }
3455
3456         do {
3457                 struct ref *ref = refs[refpos];
3458                 const char *fmt = ref->tag    ? "%s[%s]" :
3459                                   ref->remote ? "%s<%s>" : "%s%s";
3460
3461                 if (!string_format_from(buf, &bufpos, fmt, sep, ref->name))
3462                         return;
3463                 sep = ", ";
3464                 if (ref->tag)
3465                         is_tag = TRUE;
3466         } while (refs[refpos++]->next);
3467
3468         if (!is_tag && view == VIEW(REQ_VIEW_DIFF)) {
3469 try_add_describe_ref:
3470                 /* Add <tag>-g<commit_id> "fake" reference. */
3471                 if (!add_describe_ref(buf, &bufpos, commit_id, sep))
3472                         return;
3473         }
3474
3475         if (bufpos == 0)
3476                 return;
3477
3478         add_line_text(view, buf, LINE_PP_REFS);
3479 }
3480
3481 static bool
3482 pager_read(struct view *view, char *data)
3483 {
3484         struct line *line;
3485
3486         if (!data)
3487                 return TRUE;
3488
3489         line = add_line_text(view, data, get_line_type(data));
3490         if (!line)
3491                 return FALSE;
3492
3493         if (line->type == LINE_COMMIT &&
3494             (view == VIEW(REQ_VIEW_DIFF) ||
3495              view == VIEW(REQ_VIEW_LOG)))
3496                 add_pager_refs(view, line);
3497
3498         return TRUE;
3499 }
3500
3501 static enum request
3502 pager_request(struct view *view, enum request request, struct line *line)
3503 {
3504         int split = 0;
3505
3506         if (request != REQ_ENTER)
3507                 return request;
3508
3509         if (line->type == LINE_COMMIT &&
3510            (view == VIEW(REQ_VIEW_LOG) ||
3511             view == VIEW(REQ_VIEW_PAGER))) {
3512                 open_view(view, REQ_VIEW_DIFF, OPEN_SPLIT);
3513                 split = 1;
3514         }
3515
3516         /* Always scroll the view even if it was split. That way
3517          * you can use Enter to scroll through the log view and
3518          * split open each commit diff. */
3519         scroll_view(view, REQ_SCROLL_LINE_DOWN);
3520
3521         /* FIXME: A minor workaround. Scrolling the view will call report("")
3522          * but if we are scrolling a non-current view this won't properly
3523          * update the view title. */
3524         if (split)
3525                 update_view_title(view);
3526
3527         return REQ_NONE;
3528 }
3529
3530 static bool
3531 pager_grep(struct view *view, struct line *line)
3532 {
3533         regmatch_t pmatch;
3534         char *text = line->data;
3535
3536         if (!*text)
3537                 return FALSE;
3538
3539         if (regexec(view->regex, text, 1, &pmatch, 0) == REG_NOMATCH)
3540                 return FALSE;
3541
3542         return TRUE;
3543 }
3544
3545 static void
3546 pager_select(struct view *view, struct line *line)
3547 {
3548         if (line->type == LINE_COMMIT) {
3549                 char *text = (char *)line->data + STRING_SIZE("commit ");
3550
3551                 if (view != VIEW(REQ_VIEW_PAGER))
3552                         string_copy_rev(view->ref, text);
3553                 string_copy_rev(ref_commit, text);
3554         }
3555 }
3556
3557 static struct view_ops pager_ops = {
3558         "line",
3559         NULL,
3560         NULL,
3561         pager_read,
3562         pager_draw,
3563         pager_request,
3564         pager_grep,
3565         pager_select,
3566 };
3567
3568 static const char *log_argv[SIZEOF_ARG] = {
3569         "git", "log", "--no-color", "--cc", "--stat", "-n100", "%(head)", NULL
3570 };
3571
3572 static enum request
3573 log_request(struct view *view, enum request request, struct line *line)
3574 {
3575         switch (request) {
3576         case REQ_REFRESH:
3577                 load_refs();
3578                 open_view(view, REQ_VIEW_LOG, OPEN_REFRESH);
3579                 return REQ_NONE;
3580         default:
3581                 return pager_request(view, request, line);
3582         }
3583 }
3584
3585 static struct view_ops log_ops = {
3586         "line",
3587         log_argv,
3588         NULL,
3589         pager_read,
3590         pager_draw,
3591         log_request,
3592         pager_grep,
3593         pager_select,
3594 };
3595
3596 static const char *diff_argv[SIZEOF_ARG] = {
3597         "git", "show", "--pretty=fuller", "--no-color", "--root",
3598                 "--patch-with-stat", "--find-copies-harder", "-C", "%(commit)", NULL
3599 };
3600
3601 static struct view_ops diff_ops = {
3602         "line",
3603         diff_argv,
3604         NULL,
3605         pager_read,
3606         pager_draw,
3607         pager_request,
3608         pager_grep,
3609         pager_select,
3610 };
3611
3612 /*
3613  * Help backend
3614  */
3615
3616 static bool
3617 help_open(struct view *view)
3618 {
3619         char buf[SIZEOF_STR];
3620         size_t bufpos;
3621         int i;
3622
3623         if (view->lines > 0)
3624                 return TRUE;
3625
3626         add_line_text(view, "Quick reference for tig keybindings:", LINE_DEFAULT);
3627
3628         for (i = 0; i < ARRAY_SIZE(req_info); i++) {
3629                 const char *key;
3630
3631                 if (req_info[i].request == REQ_NONE)
3632                         continue;
3633
3634                 if (!req_info[i].request) {
3635                         add_line_text(view, "", LINE_DEFAULT);
3636                         add_line_text(view, req_info[i].help, LINE_DEFAULT);
3637                         continue;
3638                 }
3639
3640                 key = get_key(req_info[i].request);
3641                 if (!*key)
3642                         key = "(no key defined)";
3643
3644                 for (bufpos = 0; bufpos <= req_info[i].namelen; bufpos++) {
3645                         buf[bufpos] = tolower(req_info[i].name[bufpos]);
3646                         if (buf[bufpos] == '_')
3647                                 buf[bufpos] = '-';
3648                 }
3649
3650                 add_line_format(view, LINE_DEFAULT, "    %-25s %-20s %s",
3651                                 key, buf, req_info[i].help);
3652         }
3653
3654         if (run_requests) {
3655                 add_line_text(view, "", LINE_DEFAULT);
3656                 add_line_text(view, "External commands:", LINE_DEFAULT);
3657         }
3658
3659         for (i = 0; i < run_requests; i++) {
3660                 struct run_request *req = get_run_request(REQ_NONE + i + 1);
3661                 const char *key;
3662                 int argc;
3663
3664                 if (!req)
3665                         continue;
3666
3667                 key = get_key_name(req->key);
3668                 if (!*key)
3669                         key = "(no key defined)";
3670
3671                 for (bufpos = 0, argc = 0; req->argv[argc]; argc++)
3672                         if (!string_format_from(buf, &bufpos, "%s%s",
3673                                                 argc ? " " : "", req->argv[argc]))
3674                                 return REQ_NONE;
3675
3676                 add_line_format(view, LINE_DEFAULT, "    %-10s %-14s `%s`",
3677                                 keymap_table[req->keymap].name, key, buf);
3678         }
3679
3680         return TRUE;
3681 }
3682
3683 static struct view_ops help_ops = {
3684         "line",
3685         NULL,
3686         help_open,
3687         NULL,
3688         pager_draw,
3689         pager_request,
3690         pager_grep,
3691         pager_select,
3692 };
3693
3694
3695 /*
3696  * Tree backend
3697  */
3698
3699 struct tree_stack_entry {
3700         struct tree_stack_entry *prev;  /* Entry below this in the stack */
3701         unsigned long lineno;           /* Line number to restore */
3702         char *name;                     /* Position of name in opt_path */
3703 };
3704
3705 /* The top of the path stack. */
3706 static struct tree_stack_entry *tree_stack = NULL;
3707 unsigned long tree_lineno = 0;
3708
3709 static void
3710 pop_tree_stack_entry(void)
3711 {
3712         struct tree_stack_entry *entry = tree_stack;
3713
3714         tree_lineno = entry->lineno;
3715         entry->name[0] = 0;
3716         tree_stack = entry->prev;
3717         free(entry);
3718 }
3719
3720 static void
3721 push_tree_stack_entry(const char *name, unsigned long lineno)
3722 {
3723         struct tree_stack_entry *entry = calloc(1, sizeof(*entry));
3724         size_t pathlen = strlen(opt_path);
3725
3726         if (!entry)
3727                 return;
3728
3729         entry->prev = tree_stack;
3730         entry->name = opt_path + pathlen;
3731         tree_stack = entry;
3732
3733         if (!string_format_from(opt_path, &pathlen, "%s/", name)) {
3734                 pop_tree_stack_entry();
3735                 return;
3736         }
3737
3738         /* Move the current line to the first tree entry. */
3739         tree_lineno = 1;
3740         entry->lineno = lineno;
3741 }
3742
3743 /* Parse output from git-ls-tree(1):
3744  *
3745  * 100644 blob fb0e31ea6cc679b7379631188190e975f5789c26 Makefile
3746  * 100644 blob 5304ca4260aaddaee6498f9630e7d471b8591ea6 README
3747  * 100644 blob f931e1d229c3e185caad4449bf5b66ed72462657 tig.c
3748  * 100644 blob ed09fe897f3c7c9af90bcf80cae92558ea88ae38 web.conf
3749  */
3750
3751 #define SIZEOF_TREE_ATTR \
3752         STRING_SIZE("100644 blob ed09fe897f3c7c9af90bcf80cae92558ea88ae38\t")
3753
3754 #define SIZEOF_TREE_MODE \
3755         STRING_SIZE("100644 ")
3756
3757 #define TREE_ID_OFFSET \
3758         STRING_SIZE("100644 blob ")
3759
3760 struct tree_entry {
3761         char id[SIZEOF_REV];
3762         mode_t mode;
3763         struct tm time;                 /* Date from the author ident. */
3764         char author[75];                /* Author of the commit. */
3765         char name[1];
3766 };
3767
3768 static const char *
3769 tree_path(struct line *line)
3770 {
3771         return ((struct tree_entry *) line->data)->name;
3772 }
3773
3774
3775 static int
3776 tree_compare_entry(struct line *line1, struct line *line2)
3777 {
3778         if (line1->type != line2->type)
3779                 return line1->type == LINE_TREE_DIR ? -1 : 1;
3780         return strcmp(tree_path(line1), tree_path(line2));
3781 }
3782
3783 static struct line *
3784 tree_entry(struct view *view, enum line_type type, const char *path,
3785            const char *mode, const char *id)
3786 {
3787         struct tree_entry *entry = calloc(1, sizeof(*entry) + strlen(path));
3788         struct line *line = entry ? add_line_data(view, entry, type) : NULL;
3789
3790         if (!entry || !line) {
3791                 free(entry);
3792                 return NULL;
3793         }
3794
3795         strncpy(entry->name, path, strlen(path));
3796         if (mode)
3797                 entry->mode = strtoul(mode, NULL, 8);
3798         if (id)
3799                 string_copy_rev(entry->id, id);
3800
3801         return line;
3802 }
3803
3804 static bool
3805 tree_read_date(struct view *view, char *text, bool *read_date)
3806 {
3807         static char author_name[SIZEOF_STR];
3808         static struct tm author_time;
3809
3810         if (!text && *read_date) {
3811                 *read_date = FALSE;
3812                 return TRUE;
3813
3814         } else if (!text) {
3815                 char *path = *opt_path ? opt_path : ".";
3816                 /* Find next entry to process */
3817                 const char *log_file[] = {
3818                         "git", "log", "--no-color", "--pretty=raw",
3819                                 "--cc", "--raw", view->id, "--", path, NULL
3820                 };
3821                 struct io io = {};
3822
3823                 if (!run_io_rd(&io, log_file, FORMAT_NONE)) {
3824                         report("Failed to load tree data");
3825                         return TRUE;
3826                 }
3827
3828                 done_io(view->pipe);
3829                 view->io = io;
3830                 *read_date = TRUE;
3831                 return FALSE;
3832
3833         } else if (*text == 'a' && get_line_type(text) == LINE_AUTHOR) {
3834                 parse_author_line(text + STRING_SIZE("author "),
3835                                   author_name, sizeof(author_name), &author_time);
3836
3837         } else if (*text == ':') {
3838                 char *pos;
3839                 size_t annotated = 1;
3840                 size_t i;
3841
3842                 pos = strchr(text, '\t');
3843                 if (!pos)
3844                         return TRUE;
3845                 text = pos + 1;
3846                 if (*opt_prefix && !strncmp(text, opt_prefix, strlen(opt_prefix)))
3847                         text += strlen(opt_prefix);
3848                 if (*opt_path && !strncmp(text, opt_path, strlen(opt_path)))
3849                         text += strlen(opt_path);
3850                 pos = strchr(text, '/');
3851                 if (pos)
3852                         *pos = 0;
3853
3854                 for (i = 1; i < view->lines; i++) {
3855                         struct line *line = &view->line[i];
3856                         struct tree_entry *entry = line->data;
3857
3858                         annotated += !!*entry->author;
3859                         if (*entry->author || strcmp(entry->name, text))
3860                                 continue;
3861
3862                         string_copy(entry->author, author_name);
3863                         memcpy(&entry->time, &author_time, sizeof(entry->time));
3864                         line->dirty = 1;
3865                         break;
3866                 }
3867
3868                 if (annotated == view->lines)
3869                         kill_io(view->pipe);
3870         }
3871         return TRUE;
3872 }
3873
3874 static bool
3875 tree_read(struct view *view, char *text)
3876 {
3877         static bool read_date = FALSE;
3878         struct tree_entry *data;
3879         struct line *entry, *line;
3880         enum line_type type;
3881         size_t textlen = text ? strlen(text) : 0;
3882         char *path = text + SIZEOF_TREE_ATTR;
3883
3884         if (read_date || !text)
3885                 return tree_read_date(view, text, &read_date);
3886
3887         if (textlen <= SIZEOF_TREE_ATTR)
3888                 return FALSE;
3889         if (view->lines == 0 &&
3890             !tree_entry(view, LINE_TREE_PARENT, opt_path, NULL, NULL))
3891                 return FALSE;
3892
3893         /* Strip the path part ... */
3894         if (*opt_path) {
3895                 size_t pathlen = textlen - SIZEOF_TREE_ATTR;
3896                 size_t striplen = strlen(opt_path);
3897
3898                 if (pathlen > striplen)
3899                         memmove(path, path + striplen,
3900                                 pathlen - striplen + 1);
3901
3902                 /* Insert "link" to parent directory. */
3903                 if (view->lines == 1 &&
3904                     !tree_entry(view, LINE_TREE_DIR, "..", "040000", view->ref))
3905                         return FALSE;
3906         }
3907
3908         type = text[SIZEOF_TREE_MODE] == 't' ? LINE_TREE_DIR : LINE_TREE_FILE;
3909         entry = tree_entry(view, type, path, text, text + TREE_ID_OFFSET);
3910         if (!entry)
3911                 return FALSE;
3912         data = entry->data;
3913
3914         /* Skip "Directory ..." and ".." line. */
3915         for (line = &view->line[1 + !!*opt_path]; line < entry; line++) {
3916                 if (tree_compare_entry(line, entry) <= 0)
3917                         continue;
3918
3919                 memmove(line + 1, line, (entry - line) * sizeof(*entry));
3920
3921                 line->data = data;
3922                 line->type = type;
3923                 for (; line <= entry; line++)
3924                         line->dirty = line->cleareol = 1;
3925                 return TRUE;
3926         }
3927
3928         if (tree_lineno > view->lineno) {
3929                 view->lineno = tree_lineno;
3930                 tree_lineno = 0;
3931         }
3932
3933         return TRUE;
3934 }
3935
3936 static bool
3937 tree_draw(struct view *view, struct line *line, unsigned int lineno)
3938 {
3939         struct tree_entry *entry = line->data;
3940
3941         if (line->type == LINE_TREE_PARENT) {
3942                 if (draw_text(view, line->type, "Directory path /", TRUE))
3943                         return TRUE;
3944         } else {
3945                 char mode[11] = "-r--r--r--";
3946
3947                 if (S_ISDIR(entry->mode)) {
3948                         mode[3] = mode[6] = mode[9] = 'x';
3949                         mode[0] = 'd';
3950                 }
3951                 if (S_ISLNK(entry->mode))
3952                         mode[0] = 'l';
3953                 if (entry->mode & S_IWUSR)
3954                         mode[2] = 'w';
3955                 if (entry->mode & S_IXUSR)
3956                         mode[3] = 'x';
3957                 if (entry->mode & S_IXGRP)
3958                         mode[6] = 'x';
3959                 if (entry->mode & S_IXOTH)
3960                         mode[9] = 'x';
3961                 if (draw_field(view, LINE_TREE_MODE, mode, 11, TRUE))
3962                         return TRUE;
3963
3964                 if (opt_author && draw_author(view, entry->author))
3965                         return TRUE;
3966
3967                 if (opt_date && draw_date(view, *entry->author ? &entry->time : NULL))
3968                         return TRUE;
3969         }
3970         if (draw_text(view, line->type, entry->name, TRUE))
3971                 return TRUE;
3972         return TRUE;
3973 }
3974
3975 static void
3976 open_blob_editor()
3977 {
3978         char file[SIZEOF_STR] = "/tmp/tigblob.XXXXXX";
3979         int fd = mkstemp(file);
3980
3981         if (fd == -1)
3982                 report("Failed to create temporary file");
3983         else if (!run_io_append(blob_ops.argv, FORMAT_ALL, fd))
3984                 report("Failed to save blob data to file");
3985         else
3986                 open_editor(FALSE, file);
3987         if (fd != -1)
3988                 unlink(file);
3989 }
3990
3991 static enum request
3992 tree_request(struct view *view, enum request request, struct line *line)
3993 {
3994         enum open_flags flags;
3995
3996         switch (request) {
3997         case REQ_VIEW_BLAME:
3998                 if (line->type != LINE_TREE_FILE) {
3999                         report("Blame only supported for files");
4000                         return REQ_NONE;
4001                 }
4002
4003                 string_copy(opt_ref, view->vid);
4004                 return request;
4005
4006         case REQ_EDIT:
4007                 if (line->type != LINE_TREE_FILE) {
4008                         report("Edit only supported for files");
4009                 } else if (!is_head_commit(view->vid)) {
4010                         open_blob_editor();
4011                 } else {
4012                         open_editor(TRUE, opt_file);
4013                 }
4014                 return REQ_NONE;
4015
4016         case REQ_PARENT:
4017                 if (!*opt_path) {
4018                         /* quit view if at top of tree */
4019                         return REQ_VIEW_CLOSE;
4020                 }
4021                 /* fake 'cd  ..' */
4022                 line = &view->line[1];
4023                 break;
4024
4025         case REQ_ENTER:
4026                 break;
4027
4028         default:
4029                 return request;
4030         }
4031
4032         /* Cleanup the stack if the tree view is at a different tree. */
4033         while (!*opt_path && tree_stack)
4034                 pop_tree_stack_entry();
4035
4036         switch (line->type) {
4037         case LINE_TREE_DIR:
4038                 /* Depending on whether it is a subdir or parent (updir?) link
4039                  * mangle the path buffer. */
4040                 if (line == &view->line[1] && *opt_path) {
4041                         pop_tree_stack_entry();
4042
4043                 } else {
4044                         const char *basename = tree_path(line);
4045
4046                         push_tree_stack_entry(basename, view->lineno);
4047                 }
4048
4049                 /* Trees and subtrees share the same ID, so they are not not
4050                  * unique like blobs. */
4051                 flags = OPEN_RELOAD;
4052                 request = REQ_VIEW_TREE;
4053                 break;
4054
4055         case LINE_TREE_FILE:
4056                 flags = display[0] == view ? OPEN_SPLIT : OPEN_DEFAULT;
4057                 request = REQ_VIEW_BLOB;
4058                 break;
4059
4060         default:
4061                 return REQ_NONE;
4062         }
4063
4064         open_view(view, request, flags);
4065         if (request == REQ_VIEW_TREE)
4066                 view->lineno = tree_lineno;
4067
4068         return REQ_NONE;
4069 }
4070
4071 static void
4072 tree_select(struct view *view, struct line *line)
4073 {
4074         struct tree_entry *entry = line->data;
4075
4076         if (line->type == LINE_TREE_FILE) {
4077                 string_copy_rev(ref_blob, entry->id);
4078                 string_format(opt_file, "%s%s", opt_path, tree_path(line));
4079
4080         } else if (line->type != LINE_TREE_DIR) {
4081                 return;
4082         }
4083
4084         string_copy_rev(view->ref, entry->id);
4085 }
4086
4087 static const char *tree_argv[SIZEOF_ARG] = {
4088         "git", "ls-tree", "%(commit)", "%(directory)", NULL
4089 };
4090
4091 static struct view_ops tree_ops = {
4092         "file",
4093         tree_argv,
4094         NULL,
4095         tree_read,
4096         tree_draw,
4097         tree_request,
4098         pager_grep,
4099         tree_select,
4100 };
4101
4102 static bool
4103 blob_read(struct view *view, char *line)
4104 {
4105         if (!line)
4106                 return TRUE;
4107         return add_line_text(view, line, LINE_DEFAULT) != NULL;
4108 }
4109
4110 static enum request
4111 blob_request(struct view *view, enum request request, struct line *line)
4112 {
4113         switch (request) {
4114         case REQ_EDIT:
4115                 open_blob_editor();
4116                 return REQ_NONE;
4117         default:
4118                 return pager_request(view, request, line);
4119         }
4120 }
4121
4122 static const char *blob_argv[SIZEOF_ARG] = {
4123         "git", "cat-file", "blob", "%(blob)", NULL
4124 };
4125
4126 static struct view_ops blob_ops = {
4127         "line",
4128         blob_argv,
4129         NULL,
4130         blob_read,
4131         pager_draw,
4132         blob_request,
4133         pager_grep,
4134         pager_select,
4135 };
4136
4137 /*
4138  * Blame backend
4139  *
4140  * Loading the blame view is a two phase job:
4141  *
4142  *  1. File content is read either using opt_file from the
4143  *     filesystem or using git-cat-file.
4144  *  2. Then blame information is incrementally added by
4145  *     reading output from git-blame.
4146  */
4147
4148 static const char *blame_head_argv[] = {
4149         "git", "blame", "--incremental", "--", "%(file)", NULL
4150 };
4151
4152 static const char *blame_ref_argv[] = {
4153         "git", "blame", "--incremental", "%(ref)", "--", "%(file)", NULL
4154 };
4155
4156 static const char *blame_cat_file_argv[] = {
4157         "git", "cat-file", "blob", "%(ref):%(file)", NULL
4158 };
4159
4160 struct blame_commit {
4161         char id[SIZEOF_REV];            /* SHA1 ID. */
4162         char title[128];                /* First line of the commit message. */
4163         char author[75];                /* Author of the commit. */
4164         struct tm time;                 /* Date from the author ident. */
4165         char filename[128];             /* Name of file. */
4166         bool has_previous;              /* Was a "previous" line detected. */
4167 };
4168
4169 struct blame {
4170         struct blame_commit *commit;
4171         char text[1];
4172 };
4173
4174 static bool
4175 blame_open(struct view *view)
4176 {
4177         if (*opt_ref || !io_open(&view->io, opt_file)) {
4178                 if (!run_io_rd(&view->io, blame_cat_file_argv, FORMAT_ALL))
4179                         return FALSE;
4180         }
4181
4182         setup_update(view, opt_file);
4183         string_format(view->ref, "%s ...", opt_file);
4184
4185         return TRUE;
4186 }
4187
4188 static struct blame_commit *
4189 get_blame_commit(struct view *view, const char *id)
4190 {
4191         size_t i;
4192
4193         for (i = 0; i < view->lines; i++) {
4194                 struct blame *blame = view->line[i].data;
4195
4196                 if (!blame->commit)
4197                         continue;
4198
4199                 if (!strncmp(blame->commit->id, id, SIZEOF_REV - 1))
4200                         return blame->commit;
4201         }
4202
4203         {
4204                 struct blame_commit *commit = calloc(1, sizeof(*commit));
4205
4206                 if (commit)
4207                         string_ncopy(commit->id, id, SIZEOF_REV);
4208                 return commit;
4209         }
4210 }
4211
4212 static bool
4213 parse_number(const char **posref, size_t *number, size_t min, size_t max)
4214 {
4215         const char *pos = *posref;
4216
4217         *posref = NULL;
4218         pos = strchr(pos + 1, ' ');
4219         if (!pos || !isdigit(pos[1]))
4220                 return FALSE;
4221         *number = atoi(pos + 1);
4222         if (*number < min || *number > max)
4223                 return FALSE;
4224
4225         *posref = pos;
4226         return TRUE;
4227 }
4228
4229 static struct blame_commit *
4230 parse_blame_commit(struct view *view, const char *text, int *blamed)
4231 {
4232         struct blame_commit *commit;
4233         struct blame *blame;
4234         const char *pos = text + SIZEOF_REV - 1;
4235         size_t lineno;
4236         size_t group;
4237
4238         if (strlen(text) <= SIZEOF_REV || *pos != ' ')
4239                 return NULL;
4240
4241         if (!parse_number(&pos, &lineno, 1, view->lines) ||
4242             !parse_number(&pos, &group, 1, view->lines - lineno + 1))
4243                 return NULL;
4244
4245         commit = get_blame_commit(view, text);
4246         if (!commit)
4247                 return NULL;
4248
4249         *blamed += group;
4250         while (group--) {
4251                 struct line *line = &view->line[lineno + group - 1];
4252
4253                 blame = line->data;
4254                 blame->commit = commit;
4255                 line->dirty = 1;
4256         }
4257
4258         return commit;
4259 }
4260
4261 static bool
4262 blame_read_file(struct view *view, const char *line, bool *read_file)
4263 {
4264         if (!line) {
4265                 const char **argv = *opt_ref ? blame_ref_argv : blame_head_argv;
4266                 struct io io = {};
4267
4268                 if (view->lines == 0 && !view->parent)
4269                         die("No blame exist for %s", view->vid);
4270
4271                 if (view->lines == 0 || !run_io_rd(&io, argv, FORMAT_ALL)) {
4272                         report("Failed to load blame data");
4273                         return TRUE;
4274                 }
4275
4276                 done_io(view->pipe);
4277                 view->io = io;
4278                 *read_file = FALSE;
4279                 return FALSE;
4280
4281         } else {
4282                 size_t linelen = strlen(line);
4283                 struct blame *blame = malloc(sizeof(*blame) + linelen);
4284
4285                 blame->commit = NULL;
4286                 strncpy(blame->text, line, linelen);
4287                 blame->text[linelen] = 0;
4288                 return add_line_data(view, blame, LINE_BLAME_ID) != NULL;
4289         }
4290 }
4291
4292 static bool
4293 match_blame_header(const char *name, char **line)
4294 {
4295         size_t namelen = strlen(name);
4296         bool matched = !strncmp(name, *line, namelen);
4297
4298         if (matched)
4299                 *line += namelen;
4300
4301         return matched;
4302 }
4303
4304 static bool
4305 blame_read(struct view *view, char *line)
4306 {
4307         static struct blame_commit *commit = NULL;
4308         static int blamed = 0;
4309         static time_t author_time;
4310         static bool read_file = TRUE;
4311
4312         if (read_file)
4313                 return blame_read_file(view, line, &read_file);
4314
4315         if (!line) {
4316                 /* Reset all! */
4317                 commit = NULL;
4318                 blamed = 0;
4319                 read_file = TRUE;
4320                 string_format(view->ref, "%s", view->vid);
4321                 if (view_is_displayed(view)) {
4322                         update_view_title(view);
4323                         redraw_view_from(view, 0);
4324                 }
4325                 return TRUE;
4326         }
4327
4328         if (!commit) {
4329                 commit = parse_blame_commit(view, line, &blamed);
4330                 string_format(view->ref, "%s %2d%%", view->vid,
4331                               view->lines ? blamed * 100 / view->lines : 0);
4332
4333         } else if (match_blame_header("author ", &line)) {
4334                 string_ncopy(commit->author, line, strlen(line));
4335
4336         } else if (match_blame_header("author-time ", &line)) {
4337                 author_time = (time_t) atol(line);
4338
4339         } else if (match_blame_header("author-tz ", &line)) {
4340                 long tz;
4341
4342                 tz  = ('0' - line[1]) * 60 * 60 * 10;
4343                 tz += ('0' - line[2]) * 60 * 60;
4344                 tz += ('0' - line[3]) * 60;
4345                 tz += ('0' - line[4]) * 60;
4346
4347                 if (line[0] == '-')
4348                         tz = -tz;
4349
4350                 author_time -= tz;
4351                 gmtime_r(&author_time, &commit->time);
4352
4353         } else if (match_blame_header("summary ", &line)) {
4354                 string_ncopy(commit->title, line, strlen(line));
4355
4356         } else if (match_blame_header("previous ", &line)) {
4357                 commit->has_previous = TRUE;
4358
4359         } else if (match_blame_header("filename ", &line)) {
4360                 string_ncopy(commit->filename, line, strlen(line));
4361                 commit = NULL;
4362         }
4363
4364         return TRUE;
4365 }
4366
4367 static bool
4368 blame_draw(struct view *view, struct line *line, unsigned int lineno)
4369 {
4370         struct blame *blame = line->data;
4371         struct tm *time = NULL;
4372         const char *id = NULL, *author = NULL;
4373
4374         if (blame->commit && *blame->commit->filename) {
4375                 id = blame->commit->id;
4376                 author = blame->commit->author;
4377                 time = &blame->commit->time;
4378         }
4379
4380         if (opt_date && draw_date(view, time))
4381                 return TRUE;
4382
4383         if (opt_author && draw_author(view, author))
4384                 return TRUE;
4385
4386         if (draw_field(view, LINE_BLAME_ID, id, ID_COLS, FALSE))
4387                 return TRUE;
4388
4389         if (draw_lineno(view, lineno))
4390                 return TRUE;
4391
4392         draw_text(view, LINE_DEFAULT, blame->text, TRUE);
4393         return TRUE;
4394 }
4395
4396 static bool
4397 check_blame_commit(struct blame *blame)
4398 {
4399         if (!blame->commit)
4400                 report("Commit data not loaded yet");
4401         else if (!strcmp(blame->commit->id, NULL_ID))
4402                 report("No commit exist for the selected line");
4403         else
4404                 return TRUE;
4405         return FALSE;
4406 }
4407
4408 static enum request
4409 blame_request(struct view *view, enum request request, struct line *line)
4410 {
4411         enum open_flags flags = display[0] == view ? OPEN_SPLIT : OPEN_DEFAULT;
4412         struct blame *blame = line->data;
4413
4414         switch (request) {
4415         case REQ_VIEW_BLAME:
4416                 if (check_blame_commit(blame)) {
4417                         string_copy(opt_ref, blame->commit->id);
4418                         open_view(view, REQ_VIEW_BLAME, OPEN_REFRESH);
4419                 }
4420                 break;
4421
4422         case REQ_PARENT:
4423                 if (check_blame_commit(blame) &&
4424                     select_commit_parent(blame->commit->id, opt_ref))
4425                         open_view(view, REQ_VIEW_BLAME, OPEN_REFRESH);
4426                 break;
4427
4428         case REQ_ENTER:
4429                 if (!blame->commit) {
4430                         report("No commit loaded yet");
4431                         break;
4432                 }
4433
4434                 if (view_is_displayed(VIEW(REQ_VIEW_DIFF)) &&
4435                     !strcmp(blame->commit->id, VIEW(REQ_VIEW_DIFF)->ref))
4436                         break;
4437
4438                 if (!strcmp(blame->commit->id, NULL_ID)) {
4439                         struct view *diff = VIEW(REQ_VIEW_DIFF);
4440                         const char *diff_index_argv[] = {
4441                                 "git", "diff-index", "--root", "--patch-with-stat",
4442                                         "-C", "-M", "HEAD", "--", view->vid, NULL
4443                         };
4444
4445                         if (!blame->commit->has_previous) {
4446                                 diff_index_argv[1] = "diff";
4447                                 diff_index_argv[2] = "--no-color";
4448                                 diff_index_argv[6] = "--";
4449                                 diff_index_argv[7] = "/dev/null";
4450                         }
4451
4452                         if (!prepare_update(diff, diff_index_argv, NULL, FORMAT_DASH)) {
4453                                 report("Failed to allocate diff command");
4454                                 break;
4455                         }
4456                         flags |= OPEN_PREPARED;
4457                 }
4458
4459                 open_view(view, REQ_VIEW_DIFF, flags);
4460                 if (VIEW(REQ_VIEW_DIFF)->pipe && !strcmp(blame->commit->id, NULL_ID))
4461                         string_copy_rev(VIEW(REQ_VIEW_DIFF)->ref, NULL_ID);
4462                 break;
4463
4464         default:
4465                 return request;
4466         }
4467
4468         return REQ_NONE;
4469 }
4470
4471 static bool
4472 blame_grep(struct view *view, struct line *line)
4473 {
4474         struct blame *blame = line->data;
4475         struct blame_commit *commit = blame->commit;
4476         regmatch_t pmatch;
4477
4478 #define MATCH(text, on)                                                 \
4479         (on && *text && regexec(view->regex, text, 1, &pmatch, 0) != REG_NOMATCH)
4480
4481         if (commit) {
4482                 char buf[DATE_COLS + 1];
4483
4484                 if (MATCH(commit->title, 1) ||
4485                     MATCH(commit->author, opt_author) ||
4486                     MATCH(commit->id, opt_date))
4487                         return TRUE;
4488
4489                 if (strftime(buf, sizeof(buf), DATE_FORMAT, &commit->time) &&
4490                     MATCH(buf, 1))
4491                         return TRUE;
4492         }
4493
4494         return MATCH(blame->text, 1);
4495
4496 #undef MATCH
4497 }
4498
4499 static void
4500 blame_select(struct view *view, struct line *line)
4501 {
4502         struct blame *blame = line->data;
4503         struct blame_commit *commit = blame->commit;
4504
4505         if (!commit)
4506                 return;
4507
4508         if (!strcmp(commit->id, NULL_ID))
4509                 string_ncopy(ref_commit, "HEAD", 4);
4510         else
4511                 string_copy_rev(ref_commit, commit->id);
4512 }
4513
4514 static struct view_ops blame_ops = {
4515         "line",
4516         NULL,
4517         blame_open,
4518         blame_read,
4519         blame_draw,
4520         blame_request,
4521         blame_grep,
4522         blame_select,
4523 };
4524
4525 /*
4526  * Status backend
4527  */
4528
4529 struct status {
4530         char status;
4531         struct {
4532                 mode_t mode;
4533                 char rev[SIZEOF_REV];
4534                 char name[SIZEOF_STR];
4535         } old;
4536         struct {
4537                 mode_t mode;
4538                 char rev[SIZEOF_REV];
4539                 char name[SIZEOF_STR];
4540         } new;
4541 };
4542
4543 static char status_onbranch[SIZEOF_STR];
4544 static struct status stage_status;
4545 static enum line_type stage_line_type;
4546 static size_t stage_chunks;
4547 static int *stage_chunk;
4548
4549 /* This should work even for the "On branch" line. */
4550 static inline bool
4551 status_has_none(struct view *view, struct line *line)
4552 {
4553         return line < view->line + view->lines && !line[1].data;
4554 }
4555
4556 /* Get fields from the diff line:
4557  * :100644 100644 06a5d6ae9eca55be2e0e585a152e6b1336f2b20e 0000000000000000000000000000000000000000 M
4558  */
4559 static inline bool
4560 status_get_diff(struct status *file, const char *buf, size_t bufsize)
4561 {
4562         const char *old_mode = buf +  1;
4563         const char *new_mode = buf +  8;
4564         const char *old_rev  = buf + 15;
4565         const char *new_rev  = buf + 56;
4566         const char *status   = buf + 97;
4567
4568         if (bufsize < 98 ||
4569             old_mode[-1] != ':' ||
4570             new_mode[-1] != ' ' ||
4571             old_rev[-1]  != ' ' ||
4572             new_rev[-1]  != ' ' ||
4573             status[-1]   != ' ')
4574                 return FALSE;
4575
4576         file->status = *status;
4577
4578         string_copy_rev(file->old.rev, old_rev);
4579         string_copy_rev(file->new.rev, new_rev);
4580
4581         file->old.mode = strtoul(old_mode, NULL, 8);
4582         file->new.mode = strtoul(new_mode, NULL, 8);
4583
4584         file->old.name[0] = file->new.name[0] = 0;
4585
4586         return TRUE;
4587 }
4588
4589 static bool
4590 status_run(struct view *view, const char *argv[], char status, enum line_type type)
4591 {
4592         struct status *file = NULL;
4593         struct status *unmerged = NULL;
4594         char *buf;
4595         struct io io = {};
4596
4597         if (!run_io(&io, argv, NULL, IO_RD))
4598                 return FALSE;
4599
4600         add_line_data(view, NULL, type);
4601
4602         while ((buf = io_get(&io, 0, TRUE))) {
4603                 if (!file) {
4604                         file = calloc(1, sizeof(*file));
4605                         if (!file || !add_line_data(view, file, type))
4606                                 goto error_out;
4607                 }
4608
4609                 /* Parse diff info part. */
4610                 if (status) {
4611                         file->status = status;
4612                         if (status == 'A')
4613                                 string_copy(file->old.rev, NULL_ID);
4614
4615                 } else if (!file->status) {
4616                         if (!status_get_diff(file, buf, strlen(buf)))
4617                                 goto error_out;
4618
4619                         buf = io_get(&io, 0, TRUE);
4620                         if (!buf)
4621                                 break;
4622
4623                         /* Collapse all 'M'odified entries that follow a
4624                          * associated 'U'nmerged entry. */
4625                         if (file->status == 'U') {
4626                                 unmerged = file;
4627
4628                         } else if (unmerged) {
4629                                 int collapse = !strcmp(buf, unmerged->new.name);
4630
4631                                 unmerged = NULL;
4632                                 if (collapse) {
4633                                         free(file);
4634                                         file = NULL;
4635                                         view->lines--;
4636                                         continue;
4637                                 }
4638                         }
4639                 }
4640
4641                 /* Grab the old name for rename/copy. */
4642                 if (!*file->old.name &&
4643                     (file->status == 'R' || file->status == 'C')) {
4644                         string_ncopy(file->old.name, buf, strlen(buf));
4645
4646                         buf = io_get(&io, 0, TRUE);
4647                         if (!buf)
4648                                 break;
4649                 }
4650
4651                 /* git-ls-files just delivers a NUL separated list of
4652                  * file names similar to the second half of the
4653                  * git-diff-* output. */
4654                 string_ncopy(file->new.name, buf, strlen(buf));
4655                 if (!*file->old.name)
4656                         string_copy(file->old.name, file->new.name);
4657                 file = NULL;
4658         }
4659
4660         if (io_error(&io)) {
4661 error_out:
4662                 done_io(&io);
4663                 return FALSE;
4664         }
4665
4666         if (!view->line[view->lines - 1].data)
4667                 add_line_data(view, NULL, LINE_STAT_NONE);
4668
4669         done_io(&io);
4670         return TRUE;
4671 }
4672
4673 /* Don't show unmerged entries in the staged section. */
4674 static const char *status_diff_index_argv[] = {
4675         "git", "diff-index", "-z", "--diff-filter=ACDMRTXB",
4676                              "--cached", "-M", "HEAD", NULL
4677 };
4678
4679 static const char *status_diff_files_argv[] = {
4680         "git", "diff-files", "-z", NULL
4681 };
4682
4683 static const char *status_list_other_argv[] = {
4684         "git", "ls-files", "-z", "--others", "--exclude-standard", NULL
4685 };
4686
4687 static const char *status_list_no_head_argv[] = {
4688         "git", "ls-files", "-z", "--cached", "--exclude-standard", NULL
4689 };
4690
4691 static const char *update_index_argv[] = {
4692         "git", "update-index", "-q", "--unmerged", "--refresh", NULL
4693 };
4694
4695 /* Restore the previous line number to stay in the context or select a
4696  * line with something that can be updated. */
4697 static void
4698 status_restore(struct view *view)
4699 {
4700         if (view->p_lineno >= view->lines)
4701                 view->p_lineno = view->lines - 1;
4702         while (view->p_lineno < view->lines && !view->line[view->p_lineno].data)
4703                 view->p_lineno++;
4704         while (view->p_lineno > 0 && !view->line[view->p_lineno].data)
4705                 view->p_lineno--;
4706
4707         /* If the above fails, always skip the "On branch" line. */
4708         if (view->p_lineno < view->lines)
4709                 view->lineno = view->p_lineno;
4710         else
4711                 view->lineno = 1;
4712
4713         if (view->lineno < view->offset)
4714                 view->offset = view->lineno;
4715         else if (view->offset + view->height <= view->lineno)
4716                 view->offset = view->lineno - view->height + 1;
4717
4718         view->p_restore = FALSE;
4719 }
4720
4721 /* First parse staged info using git-diff-index(1), then parse unstaged
4722  * info using git-diff-files(1), and finally untracked files using
4723  * git-ls-files(1). */
4724 static bool
4725 status_open(struct view *view)
4726 {
4727         reset_view(view);
4728
4729         add_line_data(view, NULL, LINE_STAT_HEAD);
4730         if (is_initial_commit())
4731                 string_copy(status_onbranch, "Initial commit");
4732         else if (!*opt_head)
4733                 string_copy(status_onbranch, "Not currently on any branch");
4734         else if (!string_format(status_onbranch, "On branch %s", opt_head))
4735                 return FALSE;
4736
4737         run_io_bg(update_index_argv);
4738
4739         if (is_initial_commit()) {
4740                 if (!status_run(view, status_list_no_head_argv, 'A', LINE_STAT_STAGED))
4741                         return FALSE;
4742         } else if (!status_run(view, status_diff_index_argv, 0, LINE_STAT_STAGED)) {
4743                 return FALSE;
4744         }
4745
4746         if (!status_run(view, status_diff_files_argv, 0, LINE_STAT_UNSTAGED) ||
4747             !status_run(view, status_list_other_argv, '?', LINE_STAT_UNTRACKED))
4748                 return FALSE;
4749
4750         /* Restore the exact position or use the specialized restore
4751          * mode? */
4752         if (!view->p_restore)
4753                 status_restore(view);
4754         return TRUE;
4755 }
4756
4757 static bool
4758 status_draw(struct view *view, struct line *line, unsigned int lineno)
4759 {
4760         struct status *status = line->data;
4761         enum line_type type;
4762         const char *text;
4763
4764         if (!status) {
4765                 switch (line->type) {
4766                 case LINE_STAT_STAGED:
4767                         type = LINE_STAT_SECTION;
4768                         text = "Changes to be committed:";
4769                         break;
4770
4771                 case LINE_STAT_UNSTAGED:
4772                         type = LINE_STAT_SECTION;
4773                         text = "Changed but not updated:";
4774                         break;
4775
4776                 case LINE_STAT_UNTRACKED:
4777                         type = LINE_STAT_SECTION;
4778                         text = "Untracked files:";
4779                         break;
4780
4781                 case LINE_STAT_NONE:
4782                         type = LINE_DEFAULT;
4783                         text = "    (no files)";
4784                         break;
4785
4786                 case LINE_STAT_HEAD:
4787                         type = LINE_STAT_HEAD;
4788                         text = status_onbranch;
4789                         break;