Change scrollok strategy to leave it off unless when calling wscrl
[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 += 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 /* Reading from the prompt? */
1718 static bool input_mode = FALSE;
1719
1720 #define foreach_displayed_view(view, i) \
1721         for (i = 0; i < ARRAY_SIZE(display) && (view = display[i]); i++)
1722
1723 #define displayed_views()       (display[1] != NULL ? 2 : 1)
1724
1725 /* Current head and commit ID */
1726 static char ref_blob[SIZEOF_REF]        = "";
1727 static char ref_commit[SIZEOF_REF]      = "HEAD";
1728 static char ref_head[SIZEOF_REF]        = "HEAD";
1729
1730 struct view {
1731         const char *name;       /* View name */
1732         const char *cmd_env;    /* Command line set via environment */
1733         const char *id;         /* Points to either of ref_{head,commit,blob} */
1734
1735         struct view_ops *ops;   /* View operations */
1736
1737         enum keymap keymap;     /* What keymap does this view have */
1738         bool git_dir;           /* Whether the view requires a git directory. */
1739
1740         char ref[SIZEOF_REF];   /* Hovered commit reference */
1741         char vid[SIZEOF_REF];   /* View ID. Set to id member when updating. */
1742
1743         int height, width;      /* The width and height of the main window */
1744         WINDOW *win;            /* The main window */
1745         WINDOW *title;          /* The title window living below the main window */
1746
1747         /* Navigation */
1748         unsigned long offset;   /* Offset of the window top */
1749         unsigned long lineno;   /* Current line number */
1750         unsigned long p_offset; /* Previous offset of the window top */
1751         unsigned long p_lineno; /* Previous current line number */
1752         bool p_restore;         /* Should the previous position be restored. */
1753
1754         /* Searching */
1755         char grep[SIZEOF_STR];  /* Search string */
1756         regex_t *regex;         /* Pre-compiled regex */
1757
1758         /* If non-NULL, points to the view that opened this view. If this view
1759          * is closed tig will switch back to the parent view. */
1760         struct view *parent;
1761
1762         /* Buffering */
1763         size_t lines;           /* Total number of lines */
1764         struct line *line;      /* Line index */
1765         size_t line_alloc;      /* Total number of allocated lines */
1766         unsigned int digits;    /* Number of digits in the lines member. */
1767
1768         /* Drawing */
1769         struct line *curline;   /* Line currently being drawn. */
1770         enum line_type curtype; /* Attribute currently used for drawing. */
1771         unsigned long col;      /* Column when drawing. */
1772
1773         /* Loading */
1774         struct io io;
1775         struct io *pipe;
1776         time_t start_time;
1777         time_t update_secs;
1778 };
1779
1780 struct view_ops {
1781         /* What type of content being displayed. Used in the title bar. */
1782         const char *type;
1783         /* Default command arguments. */
1784         const char **argv;
1785         /* Open and reads in all view content. */
1786         bool (*open)(struct view *view);
1787         /* Read one line; updates view->line. */
1788         bool (*read)(struct view *view, char *data);
1789         /* Draw one line; @lineno must be < view->height. */
1790         bool (*draw)(struct view *view, struct line *line, unsigned int lineno);
1791         /* Depending on view handle a special requests. */
1792         enum request (*request)(struct view *view, enum request request, struct line *line);
1793         /* Search for regex in a line. */
1794         bool (*grep)(struct view *view, struct line *line);
1795         /* Select line */
1796         void (*select)(struct view *view, struct line *line);
1797 };
1798
1799 static struct view_ops blame_ops;
1800 static struct view_ops blob_ops;
1801 static struct view_ops diff_ops;
1802 static struct view_ops help_ops;
1803 static struct view_ops log_ops;
1804 static struct view_ops main_ops;
1805 static struct view_ops pager_ops;
1806 static struct view_ops stage_ops;
1807 static struct view_ops status_ops;
1808 static struct view_ops tree_ops;
1809
1810 #define VIEW_STR(name, env, ref, ops, map, git) \
1811         { name, #env, ref, ops, map, git }
1812
1813 #define VIEW_(id, name, ops, git, ref) \
1814         VIEW_STR(name, TIG_##id##_CMD, ref, ops, KEYMAP_##id, git)
1815
1816
1817 static struct view views[] = {
1818         VIEW_(MAIN,   "main",   &main_ops,   TRUE,  ref_head),
1819         VIEW_(DIFF,   "diff",   &diff_ops,   TRUE,  ref_commit),
1820         VIEW_(LOG,    "log",    &log_ops,    TRUE,  ref_head),
1821         VIEW_(TREE,   "tree",   &tree_ops,   TRUE,  ref_commit),
1822         VIEW_(BLOB,   "blob",   &blob_ops,   TRUE,  ref_blob),
1823         VIEW_(BLAME,  "blame",  &blame_ops,  TRUE,  ref_commit),
1824         VIEW_(HELP,   "help",   &help_ops,   FALSE, ""),
1825         VIEW_(PAGER,  "pager",  &pager_ops,  FALSE, "stdin"),
1826         VIEW_(STATUS, "status", &status_ops, TRUE,  ""),
1827         VIEW_(STAGE,  "stage",  &stage_ops,  TRUE,  ""),
1828 };
1829
1830 #define VIEW(req)       (&views[(req) - REQ_OFFSET - 1])
1831 #define VIEW_REQ(view)  ((view) - views + REQ_OFFSET + 1)
1832
1833 #define foreach_view(view, i) \
1834         for (i = 0; i < ARRAY_SIZE(views) && (view = &views[i]); i++)
1835
1836 #define view_is_displayed(view) \
1837         (view == display[0] || view == display[1])
1838
1839
1840 enum line_graphic {
1841         LINE_GRAPHIC_VLINE
1842 };
1843
1844 static int line_graphics[] = {
1845         /* LINE_GRAPHIC_VLINE: */ '|'
1846 };
1847
1848 static inline void
1849 set_view_attr(struct view *view, enum line_type type)
1850 {
1851         if (!view->curline->selected && view->curtype != type) {
1852                 wattrset(view->win, get_line_attr(type));
1853                 wchgat(view->win, -1, 0, type, NULL);
1854                 view->curtype = type;
1855         }
1856 }
1857
1858 static int
1859 draw_chars(struct view *view, enum line_type type, const char *string,
1860            int max_len, bool use_tilde)
1861 {
1862         int len = 0;
1863         int col = 0;
1864         int trimmed = FALSE;
1865
1866         if (max_len <= 0)
1867                 return 0;
1868
1869         if (opt_utf8) {
1870                 len = utf8_length(string, &col, max_len, &trimmed, use_tilde);
1871         } else {
1872                 col = len = strlen(string);
1873                 if (len > max_len) {
1874                         if (use_tilde) {
1875                                 max_len -= 1;
1876                         }
1877                         col = len = max_len;
1878                         trimmed = TRUE;
1879                 }
1880         }
1881
1882         set_view_attr(view, type);
1883         waddnstr(view->win, string, len);
1884         if (trimmed && use_tilde) {
1885                 set_view_attr(view, LINE_DELIMITER);
1886                 waddch(view->win, '~');
1887                 col++;
1888         }
1889
1890         return col;
1891 }
1892
1893 static int
1894 draw_space(struct view *view, enum line_type type, int max, int spaces)
1895 {
1896         static char space[] = "                    ";
1897         int col = 0;
1898
1899         spaces = MIN(max, spaces);
1900
1901         while (spaces > 0) {
1902                 int len = MIN(spaces, sizeof(space) - 1);
1903
1904                 col += draw_chars(view, type, space, spaces, FALSE);
1905                 spaces -= len;
1906         }
1907
1908         return col;
1909 }
1910
1911 static bool
1912 draw_lineno(struct view *view, unsigned int lineno)
1913 {
1914         char number[10];
1915         int digits3 = view->digits < 3 ? 3 : view->digits;
1916         int max_number = MIN(digits3, STRING_SIZE(number));
1917         int max = view->width - view->col;
1918         int col;
1919
1920         if (max < max_number)
1921                 max_number = max;
1922
1923         lineno += view->offset + 1;
1924         if (lineno == 1 || (lineno % opt_num_interval) == 0) {
1925                 static char fmt[] = "%1ld";
1926
1927                 if (view->digits <= 9)
1928                         fmt[1] = '0' + digits3;
1929
1930                 if (!string_format(number, fmt, lineno))
1931                         number[0] = 0;
1932                 col = draw_chars(view, LINE_LINE_NUMBER, number, max_number, TRUE);
1933         } else {
1934                 col = draw_space(view, LINE_LINE_NUMBER, max_number, max_number);
1935         }
1936
1937         if (col < max) {
1938                 set_view_attr(view, LINE_DEFAULT);
1939                 waddch(view->win, line_graphics[LINE_GRAPHIC_VLINE]);
1940                 col++;
1941         }
1942
1943         if (col < max)
1944                 col += draw_space(view, LINE_DEFAULT, max - col, 1);
1945         view->col += col;
1946
1947         return view->width - view->col <= 0;
1948 }
1949
1950 static bool
1951 draw_text(struct view *view, enum line_type type, const char *string, bool trim)
1952 {
1953         view->col += draw_chars(view, type, string, view->width - view->col, trim);
1954         return view->width - view->col <= 0;
1955 }
1956
1957 static bool
1958 draw_graphic(struct view *view, enum line_type type, chtype graphic[], size_t size)
1959 {
1960         int max = view->width - view->col;
1961         int i;
1962
1963         if (max < size)
1964                 size = max;
1965
1966         set_view_attr(view, type);
1967         /* Using waddch() instead of waddnstr() ensures that
1968          * they'll be rendered correctly for the cursor line. */
1969         for (i = 0; i < size; i++)
1970                 waddch(view->win, graphic[i]);
1971
1972         view->col += size;
1973         if (size < max) {
1974                 waddch(view->win, ' ');
1975                 view->col++;
1976         }
1977
1978         return view->width - view->col <= 0;
1979 }
1980
1981 static bool
1982 draw_field(struct view *view, enum line_type type, const char *text, int len, bool trim)
1983 {
1984         int max = MIN(view->width - view->col, len);
1985         int col;
1986
1987         if (text)
1988                 col = draw_chars(view, type, text, max - 1, trim);
1989         else
1990                 col = draw_space(view, type, max - 1, max - 1);
1991
1992         view->col += col + draw_space(view, LINE_DEFAULT, max - col, max - col);
1993         return view->width - view->col <= 0;
1994 }
1995
1996 static bool
1997 draw_date(struct view *view, struct tm *time)
1998 {
1999         char buf[DATE_COLS];
2000         char *date;
2001         int timelen = 0;
2002
2003         if (time)
2004                 timelen = strftime(buf, sizeof(buf), DATE_FORMAT, time);
2005         date = timelen ? buf : NULL;
2006
2007         return draw_field(view, LINE_DATE, date, DATE_COLS, FALSE);
2008 }
2009
2010 static bool
2011 draw_view_line(struct view *view, unsigned int lineno)
2012 {
2013         struct line *line;
2014         bool selected = (view->offset + lineno == view->lineno);
2015
2016         assert(view_is_displayed(view));
2017
2018         if (view->offset + lineno >= view->lines)
2019                 return FALSE;
2020
2021         line = &view->line[view->offset + lineno];
2022
2023         wmove(view->win, lineno, 0);
2024         if (line->cleareol)
2025                 wclrtoeol(view->win);
2026         view->col = 0;
2027         view->curline = line;
2028         view->curtype = LINE_NONE;
2029         line->selected = FALSE;
2030         line->dirty = line->cleareol = 0;
2031
2032         if (selected) {
2033                 set_view_attr(view, LINE_CURSOR);
2034                 line->selected = TRUE;
2035                 view->ops->select(view, line);
2036         }
2037
2038         return view->ops->draw(view, line, lineno);
2039 }
2040
2041 static void
2042 redraw_view_dirty(struct view *view)
2043 {
2044         bool dirty = FALSE;
2045         int lineno;
2046
2047         for (lineno = 0; lineno < view->height; lineno++) {
2048                 if (view->offset + lineno >= view->lines)
2049                         break;
2050                 if (!view->line[view->offset + lineno].dirty)
2051                         continue;
2052                 dirty = TRUE;
2053                 if (!draw_view_line(view, lineno))
2054                         break;
2055         }
2056
2057         if (!dirty)
2058                 return;
2059         if (input_mode)
2060                 wnoutrefresh(view->win);
2061         else
2062                 wrefresh(view->win);
2063 }
2064
2065 static void
2066 redraw_view_from(struct view *view, int lineno)
2067 {
2068         assert(0 <= lineno && lineno < view->height);
2069
2070         for (; lineno < view->height; lineno++) {
2071                 if (!draw_view_line(view, lineno))
2072                         break;
2073         }
2074
2075         if (input_mode)
2076                 wnoutrefresh(view->win);
2077         else
2078                 wrefresh(view->win);
2079 }
2080
2081 static void
2082 redraw_view(struct view *view)
2083 {
2084         werase(view->win);
2085         redraw_view_from(view, 0);
2086 }
2087
2088
2089 static void
2090 update_view_title(struct view *view)
2091 {
2092         char buf[SIZEOF_STR];
2093         char state[SIZEOF_STR];
2094         size_t bufpos = 0, statelen = 0;
2095
2096         assert(view_is_displayed(view));
2097
2098         if (view != VIEW(REQ_VIEW_STATUS) && view->lines) {
2099                 unsigned int view_lines = view->offset + view->height;
2100                 unsigned int lines = view->lines
2101                                    ? MIN(view_lines, view->lines) * 100 / view->lines
2102                                    : 0;
2103
2104                 string_format_from(state, &statelen, " - %s %d of %d (%d%%)",
2105                                    view->ops->type,
2106                                    view->lineno + 1,
2107                                    view->lines,
2108                                    lines);
2109
2110         }
2111
2112         if (view->pipe) {
2113                 time_t secs = time(NULL) - view->start_time;
2114
2115                 /* Three git seconds are a long time ... */
2116                 if (secs > 2)
2117                         string_format_from(state, &statelen, " loading %lds", secs);
2118         }
2119
2120         string_format_from(buf, &bufpos, "[%s]", view->name);
2121         if (*view->ref && bufpos < view->width) {
2122                 size_t refsize = strlen(view->ref);
2123                 size_t minsize = bufpos + 1 + /* abbrev= */ 7 + 1 + statelen;
2124
2125                 if (minsize < view->width)
2126                         refsize = view->width - minsize + 7;
2127                 string_format_from(buf, &bufpos, " %.*s", (int) refsize, view->ref);
2128         }
2129
2130         if (statelen && bufpos < view->width) {
2131                 string_format_from(buf, &bufpos, "%s", state);
2132         }
2133
2134         if (view == display[current_view])
2135                 wbkgdset(view->title, get_line_attr(LINE_TITLE_FOCUS));
2136         else
2137                 wbkgdset(view->title, get_line_attr(LINE_TITLE_BLUR));
2138
2139         mvwaddnstr(view->title, 0, 0, buf, bufpos);
2140         wclrtoeol(view->title);
2141         wmove(view->title, 0, view->width - 1);
2142
2143         if (input_mode)
2144                 wnoutrefresh(view->title);
2145         else
2146                 wrefresh(view->title);
2147 }
2148
2149 static void
2150 resize_display(void)
2151 {
2152         int offset, i;
2153         struct view *base = display[0];
2154         struct view *view = display[1] ? display[1] : display[0];
2155
2156         /* Setup window dimensions */
2157
2158         getmaxyx(stdscr, base->height, base->width);
2159
2160         /* Make room for the status window. */
2161         base->height -= 1;
2162
2163         if (view != base) {
2164                 /* Horizontal split. */
2165                 view->width   = base->width;
2166                 view->height  = SCALE_SPLIT_VIEW(base->height);
2167                 base->height -= view->height;
2168
2169                 /* Make room for the title bar. */
2170                 view->height -= 1;
2171         }
2172
2173         /* Make room for the title bar. */
2174         base->height -= 1;
2175
2176         offset = 0;
2177
2178         foreach_displayed_view (view, i) {
2179                 if (!view->win) {
2180                         view->win = newwin(view->height, 0, offset, 0);
2181                         if (!view->win)
2182                                 die("Failed to create %s view", view->name);
2183
2184                         scrollok(view->win, FALSE);
2185
2186                         view->title = newwin(1, 0, offset + view->height, 0);
2187                         if (!view->title)
2188                                 die("Failed to create title window");
2189
2190                 } else {
2191                         wresize(view->win, view->height, view->width);
2192                         mvwin(view->win,   offset, 0);
2193                         mvwin(view->title, offset + view->height, 0);
2194                 }
2195
2196                 offset += view->height + 1;
2197         }
2198 }
2199
2200 static void
2201 redraw_display(bool clear)
2202 {
2203         struct view *view;
2204         int i;
2205
2206         foreach_displayed_view (view, i) {
2207                 if (clear)
2208                         wclear(view->win);
2209                 redraw_view(view);
2210                 update_view_title(view);
2211         }
2212 }
2213
2214 static void
2215 update_display_cursor(struct view *view)
2216 {
2217         /* Move the cursor to the right-most column of the cursor line.
2218          *
2219          * XXX: This could turn out to be a bit expensive, but it ensures that
2220          * the cursor does not jump around. */
2221         if (view->lines) {
2222                 wmove(view->win, view->lineno - view->offset, view->width - 1);
2223                 wrefresh(view->win);
2224         }
2225 }
2226
2227 static void
2228 toggle_view_option(bool *option, const char *help)
2229 {
2230         *option = !*option;
2231         redraw_display(FALSE);
2232         report("%sabling %s", *option ? "En" : "Dis", help);
2233 }
2234
2235 /*
2236  * Navigation
2237  */
2238
2239 /* Scrolling backend */
2240 static void
2241 do_scroll_view(struct view *view, int lines)
2242 {
2243         bool redraw_current_line = FALSE;
2244
2245         /* The rendering expects the new offset. */
2246         view->offset += lines;
2247
2248         assert(0 <= view->offset && view->offset < view->lines);
2249         assert(lines);
2250
2251         /* Move current line into the view. */
2252         if (view->lineno < view->offset) {
2253                 view->lineno = view->offset;
2254                 redraw_current_line = TRUE;
2255         } else if (view->lineno >= view->offset + view->height) {
2256                 view->lineno = view->offset + view->height - 1;
2257                 redraw_current_line = TRUE;
2258         }
2259
2260         assert(view->offset <= view->lineno && view->lineno < view->lines);
2261
2262         /* Redraw the whole screen if scrolling is pointless. */
2263         if (view->height < ABS(lines)) {
2264                 redraw_view(view);
2265
2266         } else {
2267                 int line = lines > 0 ? view->height - lines : 0;
2268                 int end = line + ABS(lines);
2269
2270                 scrollok(view->win, TRUE);
2271                 wscrl(view->win, lines);
2272                 scrollok(view->win, FALSE);
2273
2274                 for (; line < end; line++) {
2275                         if (!draw_view_line(view, line))
2276                                 break;
2277                 }
2278
2279                 if (redraw_current_line)
2280                         draw_view_line(view, view->lineno - view->offset);
2281         }
2282
2283         wrefresh(view->win);
2284         report("");
2285 }
2286
2287 /* Scroll frontend */
2288 static void
2289 scroll_view(struct view *view, enum request request)
2290 {
2291         int lines = 1;
2292
2293         assert(view_is_displayed(view));
2294
2295         switch (request) {
2296         case REQ_SCROLL_PAGE_DOWN:
2297                 lines = view->height;
2298         case REQ_SCROLL_LINE_DOWN:
2299                 if (view->offset + lines > view->lines)
2300                         lines = view->lines - view->offset;
2301
2302                 if (lines == 0 || view->offset + view->height >= view->lines) {
2303                         report("Cannot scroll beyond the last line");
2304                         return;
2305                 }
2306                 break;
2307
2308         case REQ_SCROLL_PAGE_UP:
2309                 lines = view->height;
2310         case REQ_SCROLL_LINE_UP:
2311                 if (lines > view->offset)
2312                         lines = view->offset;
2313
2314                 if (lines == 0) {
2315                         report("Cannot scroll beyond the first line");
2316                         return;
2317                 }
2318
2319                 lines = -lines;
2320                 break;
2321
2322         default:
2323                 die("request %d not handled in switch", request);
2324         }
2325
2326         do_scroll_view(view, lines);
2327 }
2328
2329 /* Cursor moving */
2330 static void
2331 move_view(struct view *view, enum request request)
2332 {
2333         int scroll_steps = 0;
2334         int steps;
2335
2336         switch (request) {
2337         case REQ_MOVE_FIRST_LINE:
2338                 steps = -view->lineno;
2339                 break;
2340
2341         case REQ_MOVE_LAST_LINE:
2342                 steps = view->lines - view->lineno - 1;
2343                 break;
2344
2345         case REQ_MOVE_PAGE_UP:
2346                 steps = view->height > view->lineno
2347                       ? -view->lineno : -view->height;
2348                 break;
2349
2350         case REQ_MOVE_PAGE_DOWN:
2351                 steps = view->lineno + view->height >= view->lines
2352                       ? view->lines - view->lineno - 1 : view->height;
2353                 break;
2354
2355         case REQ_MOVE_UP:
2356                 steps = -1;
2357                 break;
2358
2359         case REQ_MOVE_DOWN:
2360                 steps = 1;
2361                 break;
2362
2363         default:
2364                 die("request %d not handled in switch", request);
2365         }
2366
2367         if (steps <= 0 && view->lineno == 0) {
2368                 report("Cannot move beyond the first line");
2369                 return;
2370
2371         } else if (steps >= 0 && view->lineno + 1 >= view->lines) {
2372                 report("Cannot move beyond the last line");
2373                 return;
2374         }
2375
2376         /* Move the current line */
2377         view->lineno += steps;
2378         assert(0 <= view->lineno && view->lineno < view->lines);
2379
2380         /* Check whether the view needs to be scrolled */
2381         if (view->lineno < view->offset ||
2382             view->lineno >= view->offset + view->height) {
2383                 scroll_steps = steps;
2384                 if (steps < 0 && -steps > view->offset) {
2385                         scroll_steps = -view->offset;
2386
2387                 } else if (steps > 0) {
2388                         if (view->lineno == view->lines - 1 &&
2389                             view->lines > view->height) {
2390                                 scroll_steps = view->lines - view->offset - 1;
2391                                 if (scroll_steps >= view->height)
2392                                         scroll_steps -= view->height - 1;
2393                         }
2394                 }
2395         }
2396
2397         if (!view_is_displayed(view)) {
2398                 view->offset += scroll_steps;
2399                 assert(0 <= view->offset && view->offset < view->lines);
2400                 view->ops->select(view, &view->line[view->lineno]);
2401                 return;
2402         }
2403
2404         /* Repaint the old "current" line if we be scrolling */
2405         if (ABS(steps) < view->height)
2406                 draw_view_line(view, view->lineno - steps - view->offset);
2407
2408         if (scroll_steps) {
2409                 do_scroll_view(view, scroll_steps);
2410                 return;
2411         }
2412
2413         /* Draw the current line */
2414         draw_view_line(view, view->lineno - view->offset);
2415
2416         wrefresh(view->win);
2417         report("");
2418 }
2419
2420
2421 /*
2422  * Searching
2423  */
2424
2425 static void search_view(struct view *view, enum request request);
2426
2427 static void
2428 select_view_line(struct view *view, unsigned long lineno)
2429 {
2430         if (lineno - view->offset >= view->height) {
2431                 view->offset = lineno;
2432                 view->lineno = lineno;
2433                 if (view_is_displayed(view))
2434                         redraw_view(view);
2435
2436         } else {
2437                 unsigned long old_lineno = view->lineno - view->offset;
2438
2439                 view->lineno = lineno;
2440                 if (view_is_displayed(view)) {
2441                         draw_view_line(view, old_lineno);
2442                         draw_view_line(view, view->lineno - view->offset);
2443                         wrefresh(view->win);
2444                 } else {
2445                         view->ops->select(view, &view->line[view->lineno]);
2446                 }
2447         }
2448 }
2449
2450 static void
2451 find_next(struct view *view, enum request request)
2452 {
2453         unsigned long lineno = view->lineno;
2454         int direction;
2455
2456         if (!*view->grep) {
2457                 if (!*opt_search)
2458                         report("No previous search");
2459                 else
2460                         search_view(view, request);
2461                 return;
2462         }
2463
2464         switch (request) {
2465         case REQ_SEARCH:
2466         case REQ_FIND_NEXT:
2467                 direction = 1;
2468                 break;
2469
2470         case REQ_SEARCH_BACK:
2471         case REQ_FIND_PREV:
2472                 direction = -1;
2473                 break;
2474
2475         default:
2476                 return;
2477         }
2478
2479         if (request == REQ_FIND_NEXT || request == REQ_FIND_PREV)
2480                 lineno += direction;
2481
2482         /* Note, lineno is unsigned long so will wrap around in which case it
2483          * will become bigger than view->lines. */
2484         for (; lineno < view->lines; lineno += direction) {
2485                 if (view->ops->grep(view, &view->line[lineno])) {
2486                         select_view_line(view, lineno);
2487                         report("Line %ld matches '%s'", lineno + 1, view->grep);
2488                         return;
2489                 }
2490         }
2491
2492         report("No match found for '%s'", view->grep);
2493 }
2494
2495 static void
2496 search_view(struct view *view, enum request request)
2497 {
2498         int regex_err;
2499
2500         if (view->regex) {
2501                 regfree(view->regex);
2502                 *view->grep = 0;
2503         } else {
2504                 view->regex = calloc(1, sizeof(*view->regex));
2505                 if (!view->regex)
2506                         return;
2507         }
2508
2509         regex_err = regcomp(view->regex, opt_search, REG_EXTENDED);
2510         if (regex_err != 0) {
2511                 char buf[SIZEOF_STR] = "unknown error";
2512
2513                 regerror(regex_err, view->regex, buf, sizeof(buf));
2514                 report("Search failed: %s", buf);
2515                 return;
2516         }
2517
2518         string_copy(view->grep, opt_search);
2519
2520         find_next(view, request);
2521 }
2522
2523 /*
2524  * Incremental updating
2525  */
2526
2527 static void
2528 reset_view(struct view *view)
2529 {
2530         int i;
2531
2532         for (i = 0; i < view->lines; i++)
2533                 free(view->line[i].data);
2534         free(view->line);
2535
2536         view->p_offset = view->offset;
2537         view->p_lineno = view->lineno;
2538
2539         view->line = NULL;
2540         view->offset = 0;
2541         view->lines  = 0;
2542         view->lineno = 0;
2543         view->line_alloc = 0;
2544         view->vid[0] = 0;
2545         view->update_secs = 0;
2546 }
2547
2548 static void
2549 free_argv(const char *argv[])
2550 {
2551         int argc;
2552
2553         for (argc = 0; argv[argc]; argc++)
2554                 free((void *) argv[argc]);
2555 }
2556
2557 static bool
2558 format_argv(const char *dst_argv[], const char *src_argv[], enum format_flags flags)
2559 {
2560         char buf[SIZEOF_STR];
2561         int argc;
2562         bool noreplace = flags == FORMAT_NONE;
2563
2564         free_argv(dst_argv);
2565
2566         for (argc = 0; src_argv[argc]; argc++) {
2567                 const char *arg = src_argv[argc];
2568                 size_t bufpos = 0;
2569
2570                 while (arg) {
2571                         char *next = strstr(arg, "%(");
2572                         int len = next - arg;
2573                         const char *value;
2574
2575                         if (!next || noreplace) {
2576                                 if (flags == FORMAT_DASH && !strcmp(arg, "--"))
2577                                         noreplace = TRUE;
2578                                 len = strlen(arg);
2579                                 value = "";
2580
2581                         } else if (!prefixcmp(next, "%(directory)")) {
2582                                 value = opt_path;
2583
2584                         } else if (!prefixcmp(next, "%(file)")) {
2585                                 value = opt_file;
2586
2587                         } else if (!prefixcmp(next, "%(ref)")) {
2588                                 value = *opt_ref ? opt_ref : "HEAD";
2589
2590                         } else if (!prefixcmp(next, "%(head)")) {
2591                                 value = ref_head;
2592
2593                         } else if (!prefixcmp(next, "%(commit)")) {
2594                                 value = ref_commit;
2595
2596                         } else if (!prefixcmp(next, "%(blob)")) {
2597                                 value = ref_blob;
2598
2599                         } else {
2600                                 report("Unknown replacement: `%s`", next);
2601                                 return FALSE;
2602                         }
2603
2604                         if (!string_format_from(buf, &bufpos, "%.*s%s", len, arg, value))
2605                                 return FALSE;
2606
2607                         arg = next && !noreplace ? strchr(next, ')') + 1 : NULL;
2608                 }
2609
2610                 dst_argv[argc] = strdup(buf);
2611                 if (!dst_argv[argc])
2612                         break;
2613         }
2614
2615         dst_argv[argc] = NULL;
2616
2617         return src_argv[argc] == NULL;
2618 }
2619
2620 static bool
2621 restore_view_position(struct view *view)
2622 {
2623         if (!view->p_restore || (view->pipe && view->lines <= view->p_lineno))
2624                 return FALSE;
2625
2626         /* Changing the view position cancels the restoring. */
2627         /* FIXME: Changing back to the first line is not detected. */
2628         if (view->offset != 0 || view->lineno != 0) {
2629                 view->p_restore = FALSE;
2630                 return FALSE;
2631         }
2632
2633         if (view->p_lineno >= view->lines) {
2634                 view->p_lineno = view->lines > 0 ? view->lines - 1 : 0;
2635                 if (view->p_offset >= view->p_lineno) {
2636                         unsigned long half = view->height / 2;
2637
2638                         if (view->p_lineno > half)
2639                                 view->p_offset = view->p_lineno - half;
2640                         else
2641                                 view->p_offset = 0;
2642                 }
2643         }
2644
2645         if (view_is_displayed(view) &&
2646             view->offset != view->p_offset &&
2647             view->lineno != view->p_lineno)
2648                 werase(view->win);
2649
2650         view->offset = view->p_offset;
2651         view->lineno = view->p_lineno;
2652         view->p_restore = FALSE;
2653
2654         return TRUE;
2655 }
2656
2657 static void
2658 end_update(struct view *view, bool force)
2659 {
2660         if (!view->pipe)
2661                 return;
2662         while (!view->ops->read(view, NULL))
2663                 if (!force)
2664                         return;
2665         set_nonblocking_input(FALSE);
2666         if (force)
2667                 kill_io(view->pipe);
2668         done_io(view->pipe);
2669         view->pipe = NULL;
2670 }
2671
2672 static void
2673 setup_update(struct view *view, const char *vid)
2674 {
2675         set_nonblocking_input(TRUE);
2676         reset_view(view);
2677         string_copy_rev(view->vid, vid);
2678         view->pipe = &view->io;
2679         view->start_time = time(NULL);
2680 }
2681
2682 static bool
2683 prepare_update(struct view *view, const char *argv[], const char *dir,
2684                enum format_flags flags)
2685 {
2686         if (view->pipe)
2687                 end_update(view, TRUE);
2688         return init_io_rd(&view->io, argv, dir, flags);
2689 }
2690
2691 static bool
2692 prepare_update_file(struct view *view, const char *name)
2693 {
2694         if (view->pipe)
2695                 end_update(view, TRUE);
2696         return io_open(&view->io, name);
2697 }
2698
2699 static bool
2700 begin_update(struct view *view, bool refresh)
2701 {
2702         if (view->pipe)
2703                 end_update(view, TRUE);
2704
2705         if (refresh) {
2706                 if (!start_io(&view->io))
2707                         return FALSE;
2708
2709         } else {
2710                 if (view == VIEW(REQ_VIEW_TREE) && strcmp(view->vid, view->id))
2711                         opt_path[0] = 0;
2712
2713                 if (!run_io_rd(&view->io, view->ops->argv, FORMAT_ALL))
2714                         return FALSE;
2715
2716                 /* Put the current ref_* value to the view title ref
2717                  * member. This is needed by the blob view. Most other
2718                  * views sets it automatically after loading because the
2719                  * first line is a commit line. */
2720                 string_copy_rev(view->ref, view->id);
2721         }
2722
2723         setup_update(view, view->id);
2724
2725         return TRUE;
2726 }
2727
2728 #define ITEM_CHUNK_SIZE 256
2729 static void *
2730 realloc_items(void *mem, size_t *size, size_t new_size, size_t item_size)
2731 {
2732         size_t num_chunks = *size / ITEM_CHUNK_SIZE;
2733         size_t num_chunks_new = (new_size + ITEM_CHUNK_SIZE - 1) / ITEM_CHUNK_SIZE;
2734
2735         if (mem == NULL || num_chunks != num_chunks_new) {
2736                 *size = num_chunks_new * ITEM_CHUNK_SIZE;
2737                 mem = realloc(mem, *size * item_size);
2738         }
2739
2740         return mem;
2741 }
2742
2743 static struct line *
2744 realloc_lines(struct view *view, size_t line_size)
2745 {
2746         size_t alloc = view->line_alloc;
2747         struct line *tmp = realloc_items(view->line, &alloc, line_size,
2748                                          sizeof(*view->line));
2749
2750         if (!tmp)
2751                 return NULL;
2752
2753         view->line = tmp;
2754         view->line_alloc = alloc;
2755         return view->line;
2756 }
2757
2758 static bool
2759 update_view(struct view *view)
2760 {
2761         char out_buffer[BUFSIZ * 2];
2762         char *line;
2763         /* Clear the view and redraw everything since the tree sorting
2764          * might have rearranged things. */
2765         bool redraw = view->lines == 0;
2766         bool can_read = TRUE;
2767
2768         if (!view->pipe)
2769                 return TRUE;
2770
2771         if (!io_can_read(view->pipe)) {
2772                 if (view->lines == 0) {
2773                         time_t secs = time(NULL) - view->start_time;
2774
2775                         if (secs > view->update_secs) {
2776                                 if (view->update_secs == 0)
2777                                         redraw_view(view);
2778                                 update_view_title(view);
2779                                 view->update_secs = secs;
2780                         }
2781                 }
2782                 return TRUE;
2783         }
2784
2785         for (; (line = io_get(view->pipe, '\n', can_read)); can_read = FALSE) {
2786                 if (opt_iconv != ICONV_NONE) {
2787                         ICONV_CONST char *inbuf = line;
2788                         size_t inlen = strlen(line) + 1;
2789
2790                         char *outbuf = out_buffer;
2791                         size_t outlen = sizeof(out_buffer);
2792
2793                         size_t ret;
2794
2795                         ret = iconv(opt_iconv, &inbuf, &inlen, &outbuf, &outlen);
2796                         if (ret != (size_t) -1)
2797                                 line = out_buffer;
2798                 }
2799
2800                 if (!view->ops->read(view, line)) {
2801                         report("Allocation failure");
2802                         end_update(view, TRUE);
2803                         return FALSE;
2804                 }
2805         }
2806
2807         {
2808                 unsigned long lines = view->lines;
2809                 int digits;
2810
2811                 for (digits = 0; lines; digits++)
2812                         lines /= 10;
2813
2814                 /* Keep the displayed view in sync with line number scaling. */
2815                 if (digits != view->digits) {
2816                         view->digits = digits;
2817                         if (opt_line_number || view == VIEW(REQ_VIEW_BLAME))
2818                                 redraw = TRUE;
2819                 }
2820         }
2821
2822         if (io_error(view->pipe)) {
2823                 report("Failed to read: %s", io_strerror(view->pipe));
2824                 end_update(view, TRUE);
2825
2826         } else if (io_eof(view->pipe)) {
2827                 report("");
2828                 end_update(view, FALSE);
2829         }
2830
2831         if (restore_view_position(view))
2832                 redraw = TRUE;
2833
2834         if (!view_is_displayed(view))
2835                 return TRUE;
2836
2837         if (redraw)
2838                 redraw_view_from(view, 0);
2839         else
2840                 redraw_view_dirty(view);
2841
2842         /* Update the title _after_ the redraw so that if the redraw picks up a
2843          * commit reference in view->ref it'll be available here. */
2844         update_view_title(view);
2845         return TRUE;
2846 }
2847
2848 static struct line *
2849 add_line_data(struct view *view, void *data, enum line_type type)
2850 {
2851         struct line *line;
2852
2853         if (!realloc_lines(view, view->lines + 1))
2854                 return NULL;
2855
2856         line = &view->line[view->lines++];
2857         memset(line, 0, sizeof(*line));
2858         line->type = type;
2859         line->data = data;
2860         line->dirty = 1;
2861
2862         return line;
2863 }
2864
2865 static struct line *
2866 add_line_text(struct view *view, const char *text, enum line_type type)
2867 {
2868         char *data = text ? strdup(text) : NULL;
2869
2870         return data ? add_line_data(view, data, type) : NULL;
2871 }
2872
2873 static struct line *
2874 add_line_format(struct view *view, enum line_type type, const char *fmt, ...)
2875 {
2876         char buf[SIZEOF_STR];
2877         va_list args;
2878
2879         va_start(args, fmt);
2880         if (vsnprintf(buf, sizeof(buf), fmt, args) >= sizeof(buf))
2881                 buf[0] = 0;
2882         va_end(args);
2883
2884         return buf[0] ? add_line_text(view, buf, type) : NULL;
2885 }
2886
2887 /*
2888  * View opening
2889  */
2890
2891 enum open_flags {
2892         OPEN_DEFAULT = 0,       /* Use default view switching. */
2893         OPEN_SPLIT = 1,         /* Split current view. */
2894         OPEN_BACKGROUNDED = 2,  /* Backgrounded. */
2895         OPEN_RELOAD = 4,        /* Reload view even if it is the current. */
2896         OPEN_NOMAXIMIZE = 8,    /* Do not maximize the current view. */
2897         OPEN_REFRESH = 16,      /* Refresh view using previous command. */
2898         OPEN_PREPARED = 32,     /* Open already prepared command. */
2899 };
2900
2901 static void
2902 open_view(struct view *prev, enum request request, enum open_flags flags)
2903 {
2904         bool backgrounded = !!(flags & OPEN_BACKGROUNDED);
2905         bool split = !!(flags & OPEN_SPLIT);
2906         bool reload = !!(flags & (OPEN_RELOAD | OPEN_REFRESH | OPEN_PREPARED));
2907         bool nomaximize = !!(flags & (OPEN_NOMAXIMIZE | OPEN_REFRESH));
2908         struct view *view = VIEW(request);
2909         int nviews = displayed_views();
2910         struct view *base_view = display[0];
2911
2912         if (view == prev && nviews == 1 && !reload) {
2913                 report("Already in %s view", view->name);
2914                 return;
2915         }
2916
2917         if (view->git_dir && !opt_git_dir[0]) {
2918                 report("The %s view is disabled in pager view", view->name);
2919                 return;
2920         }
2921
2922         if (split) {
2923                 display[1] = view;
2924                 if (!backgrounded)
2925                         current_view = 1;
2926         } else if (!nomaximize) {
2927                 /* Maximize the current view. */
2928                 memset(display, 0, sizeof(display));
2929                 current_view = 0;
2930                 display[current_view] = view;
2931         }
2932
2933         /* Resize the view when switching between split- and full-screen,
2934          * or when switching between two different full-screen views. */
2935         if (nviews != displayed_views() ||
2936             (nviews == 1 && base_view != display[0]))
2937                 resize_display();
2938
2939         if (view->ops->open) {
2940                 if (view->pipe)
2941                         end_update(view, TRUE);
2942                 if (!view->ops->open(view)) {
2943                         report("Failed to load %s view", view->name);
2944                         return;
2945                 }
2946                 restore_view_position(view);
2947
2948         } else if ((reload || strcmp(view->vid, view->id)) &&
2949                    !begin_update(view, flags & (OPEN_REFRESH | OPEN_PREPARED))) {
2950                 report("Failed to load %s view", view->name);
2951                 return;
2952         }
2953
2954         if (split && prev->lineno - prev->offset >= prev->height) {
2955                 /* Take the title line into account. */
2956                 int lines = prev->lineno - prev->offset - prev->height + 1;
2957
2958                 /* Scroll the view that was split if the current line is
2959                  * outside the new limited view. */
2960                 do_scroll_view(prev, lines);
2961         }
2962
2963         if (prev && view != prev) {
2964                 if (split && !backgrounded) {
2965                         /* "Blur" the previous view. */
2966                         update_view_title(prev);
2967                 }
2968
2969                 view->parent = prev;
2970         }
2971
2972         if (view->pipe && view->lines == 0) {
2973                 /* Clear the old view and let the incremental updating refill
2974                  * the screen. */
2975                 werase(view->win);
2976                 view->p_restore = flags & (OPEN_RELOAD | OPEN_REFRESH);
2977                 report("");
2978         } else if (view_is_displayed(view)) {
2979                 redraw_view(view);
2980                 report("");
2981         }
2982
2983         /* If the view is backgrounded the above calls to report()
2984          * won't redraw the view title. */
2985         if (backgrounded)
2986                 update_view_title(view);
2987 }
2988
2989 static void
2990 open_external_viewer(const char *argv[], const char *dir)
2991 {
2992         def_prog_mode();           /* save current tty modes */
2993         endwin();                  /* restore original tty modes */
2994         run_io_fg(argv, dir);
2995         fprintf(stderr, "Press Enter to continue");
2996         getc(opt_tty);
2997         reset_prog_mode();
2998         redraw_display(TRUE);
2999 }
3000
3001 static void
3002 open_mergetool(const char *file)
3003 {
3004         const char *mergetool_argv[] = { "git", "mergetool", file, NULL };
3005
3006         open_external_viewer(mergetool_argv, opt_cdup);
3007 }
3008
3009 static void
3010 open_editor(bool from_root, const char *file)
3011 {
3012         const char *editor_argv[] = { "vi", file, NULL };
3013         const char *editor;
3014
3015         editor = getenv("GIT_EDITOR");
3016         if (!editor && *opt_editor)
3017                 editor = opt_editor;
3018         if (!editor)
3019                 editor = getenv("VISUAL");
3020         if (!editor)
3021                 editor = getenv("EDITOR");
3022         if (!editor)
3023                 editor = "vi";
3024
3025         editor_argv[0] = editor;
3026         open_external_viewer(editor_argv, from_root ? opt_cdup : NULL);
3027 }
3028
3029 static void
3030 open_run_request(enum request request)
3031 {
3032         struct run_request *req = get_run_request(request);
3033         const char *argv[ARRAY_SIZE(req->argv)] = { NULL };
3034
3035         if (!req) {
3036                 report("Unknown run request");
3037                 return;
3038         }
3039
3040         if (format_argv(argv, req->argv, FORMAT_ALL))
3041                 open_external_viewer(argv, NULL);
3042         free_argv(argv);
3043 }
3044
3045 /*
3046  * User request switch noodle
3047  */
3048
3049 static int
3050 view_driver(struct view *view, enum request request)
3051 {
3052         int i;
3053
3054         if (request == REQ_NONE) {
3055                 doupdate();
3056                 return TRUE;
3057         }
3058
3059         if (request > REQ_NONE) {
3060                 open_run_request(request);
3061                 /* FIXME: When all views can refresh always do this. */
3062                 if (view == VIEW(REQ_VIEW_STATUS) ||
3063                     view == VIEW(REQ_VIEW_MAIN) ||
3064                     view == VIEW(REQ_VIEW_LOG) ||
3065                     view == VIEW(REQ_VIEW_STAGE))
3066                         request = REQ_REFRESH;
3067                 else
3068                         return TRUE;
3069         }
3070
3071         if (view && view->lines) {
3072                 request = view->ops->request(view, request, &view->line[view->lineno]);
3073                 if (request == REQ_NONE)
3074                         return TRUE;
3075         }
3076
3077         switch (request) {
3078         case REQ_MOVE_UP:
3079         case REQ_MOVE_DOWN:
3080         case REQ_MOVE_PAGE_UP:
3081         case REQ_MOVE_PAGE_DOWN:
3082         case REQ_MOVE_FIRST_LINE:
3083         case REQ_MOVE_LAST_LINE:
3084                 move_view(view, request);
3085                 break;
3086
3087         case REQ_SCROLL_LINE_DOWN:
3088         case REQ_SCROLL_LINE_UP:
3089         case REQ_SCROLL_PAGE_DOWN:
3090         case REQ_SCROLL_PAGE_UP:
3091                 scroll_view(view, request);
3092                 break;
3093
3094         case REQ_VIEW_BLAME:
3095                 if (!opt_file[0]) {
3096                         report("No file chosen, press %s to open tree view",
3097                                get_key(REQ_VIEW_TREE));
3098                         break;
3099                 }
3100                 open_view(view, request, OPEN_DEFAULT);
3101                 break;
3102
3103         case REQ_VIEW_BLOB:
3104                 if (!ref_blob[0]) {
3105                         report("No file chosen, press %s to open tree view",
3106                                get_key(REQ_VIEW_TREE));
3107                         break;
3108                 }
3109                 open_view(view, request, OPEN_DEFAULT);
3110                 break;
3111
3112         case REQ_VIEW_PAGER:
3113                 if (!VIEW(REQ_VIEW_PAGER)->pipe && !VIEW(REQ_VIEW_PAGER)->lines) {
3114                         report("No pager content, press %s to run command from prompt",
3115                                get_key(REQ_PROMPT));
3116                         break;
3117                 }
3118                 open_view(view, request, OPEN_DEFAULT);
3119                 break;
3120
3121         case REQ_VIEW_STAGE:
3122                 if (!VIEW(REQ_VIEW_STAGE)->lines) {
3123                         report("No stage content, press %s to open the status view and choose file",
3124                                get_key(REQ_VIEW_STATUS));
3125                         break;
3126                 }
3127                 open_view(view, request, OPEN_DEFAULT);
3128                 break;
3129
3130         case REQ_VIEW_STATUS:
3131                 if (opt_is_inside_work_tree == FALSE) {
3132                         report("The status view requires a working tree");
3133                         break;
3134                 }
3135                 open_view(view, request, OPEN_DEFAULT);
3136                 break;
3137
3138         case REQ_VIEW_MAIN:
3139         case REQ_VIEW_DIFF:
3140         case REQ_VIEW_LOG:
3141         case REQ_VIEW_TREE:
3142         case REQ_VIEW_HELP:
3143                 open_view(view, request, OPEN_DEFAULT);
3144                 break;
3145
3146         case REQ_NEXT:
3147         case REQ_PREVIOUS:
3148                 request = request == REQ_NEXT ? REQ_MOVE_DOWN : REQ_MOVE_UP;
3149
3150                 if ((view == VIEW(REQ_VIEW_DIFF) &&
3151                      view->parent == VIEW(REQ_VIEW_MAIN)) ||
3152                    (view == VIEW(REQ_VIEW_DIFF) &&
3153                      view->parent == VIEW(REQ_VIEW_BLAME)) ||
3154                    (view == VIEW(REQ_VIEW_STAGE) &&
3155                      view->parent == VIEW(REQ_VIEW_STATUS)) ||
3156                    (view == VIEW(REQ_VIEW_BLOB) &&
3157                      view->parent == VIEW(REQ_VIEW_TREE))) {
3158                         int line;
3159
3160                         view = view->parent;
3161                         line = view->lineno;
3162                         move_view(view, request);
3163                         if (view_is_displayed(view))
3164                                 update_view_title(view);
3165                         if (line != view->lineno)
3166                                 view->ops->request(view, REQ_ENTER,
3167                                                    &view->line[view->lineno]);
3168
3169                 } else {
3170                         move_view(view, request);
3171                 }
3172                 break;
3173
3174         case REQ_VIEW_NEXT:
3175         {
3176                 int nviews = displayed_views();
3177                 int next_view = (current_view + 1) % nviews;
3178
3179                 if (next_view == current_view) {
3180                         report("Only one view is displayed");
3181                         break;
3182                 }
3183
3184                 current_view = next_view;
3185                 /* Blur out the title of the previous view. */
3186                 update_view_title(view);
3187                 report("");
3188                 break;
3189         }
3190         case REQ_REFRESH:
3191                 report("Refreshing is not yet supported for the %s view", view->name);
3192                 break;
3193
3194         case REQ_MAXIMIZE:
3195                 if (displayed_views() == 2)
3196                         open_view(view, VIEW_REQ(view), OPEN_DEFAULT);
3197                 break;
3198
3199         case REQ_TOGGLE_LINENO:
3200                 toggle_view_option(&opt_line_number, "line numbers");
3201                 break;
3202
3203         case REQ_TOGGLE_DATE:
3204                 toggle_view_option(&opt_date, "date display");
3205                 break;
3206
3207         case REQ_TOGGLE_AUTHOR:
3208                 toggle_view_option(&opt_author, "author display");
3209                 break;
3210
3211         case REQ_TOGGLE_REV_GRAPH:
3212                 toggle_view_option(&opt_rev_graph, "revision graph display");
3213                 break;
3214
3215         case REQ_TOGGLE_REFS:
3216                 toggle_view_option(&opt_show_refs, "reference display");
3217                 break;
3218
3219         case REQ_SEARCH:
3220         case REQ_SEARCH_BACK:
3221                 search_view(view, request);
3222                 break;
3223
3224         case REQ_FIND_NEXT:
3225         case REQ_FIND_PREV:
3226                 find_next(view, request);
3227                 break;
3228
3229         case REQ_STOP_LOADING:
3230                 for (i = 0; i < ARRAY_SIZE(views); i++) {
3231                         view = &views[i];
3232                         if (view->pipe)
3233                                 report("Stopped loading the %s view", view->name),
3234                         end_update(view, TRUE);
3235                 }
3236                 break;
3237
3238         case REQ_SHOW_VERSION:
3239                 report("tig-%s (built %s)", TIG_VERSION, __DATE__);
3240                 return TRUE;
3241
3242         case REQ_SCREEN_REDRAW:
3243                 redraw_display(TRUE);
3244                 break;
3245
3246         case REQ_EDIT:
3247                 report("Nothing to edit");
3248                 break;
3249
3250         case REQ_ENTER:
3251                 report("Nothing to enter");
3252                 break;
3253
3254         case REQ_VIEW_CLOSE:
3255                 /* XXX: Mark closed views by letting view->parent point to the
3256                  * view itself. Parents to closed view should never be
3257                  * followed. */
3258                 if (view->parent &&
3259                     view->parent->parent != view->parent) {
3260                         memset(display, 0, sizeof(display));
3261                         current_view = 0;
3262                         display[current_view] = view->parent;
3263                         view->parent = view;
3264                         resize_display();
3265                         redraw_display(FALSE);
3266                         report("");
3267                         break;
3268                 }
3269                 /* Fall-through */
3270         case REQ_QUIT:
3271                 return FALSE;
3272
3273         default:
3274                 report("Unknown key, press 'h' for help");
3275                 return TRUE;
3276         }
3277
3278         return TRUE;
3279 }
3280
3281
3282 /*
3283  * View backend utilities
3284  */
3285
3286 /* Parse author lines where the name may be empty:
3287  *      author  <email@address.tld> 1138474660 +0100
3288  */
3289 static void
3290 parse_author_line(char *ident, char *author, size_t authorsize, struct tm *tm)
3291 {
3292         char *nameend = strchr(ident, '<');
3293         char *emailend = strchr(ident, '>');
3294
3295         if (nameend && emailend)
3296                 *nameend = *emailend = 0;
3297         ident = chomp_string(ident);
3298         if (!*ident) {
3299                 if (nameend)
3300                         ident = chomp_string(nameend + 1);
3301                 if (!*ident)
3302                         ident = "Unknown";
3303         }
3304
3305         string_ncopy_do(author, authorsize, ident, strlen(ident));
3306
3307         /* Parse epoch and timezone */
3308         if (emailend && emailend[1] == ' ') {
3309                 char *secs = emailend + 2;
3310                 char *zone = strchr(secs, ' ');
3311                 time_t time = (time_t) atol(secs);
3312
3313                 if (zone && strlen(zone) == STRING_SIZE(" +0700")) {
3314                         long tz;
3315
3316                         zone++;
3317                         tz  = ('0' - zone[1]) * 60 * 60 * 10;
3318                         tz += ('0' - zone[2]) * 60 * 60;
3319                         tz += ('0' - zone[3]) * 60;
3320                         tz += ('0' - zone[4]) * 60;
3321
3322                         if (zone[0] == '-')
3323                                 tz = -tz;
3324
3325                         time -= tz;
3326                 }
3327
3328                 gmtime_r(&time, tm);
3329         }
3330 }
3331
3332 static enum input_status
3333 select_commit_parent_handler(void *data, char *buf, int c)
3334 {
3335         size_t parents = *(size_t *) data;
3336         int parent = 0;
3337
3338         if (!isdigit(c))
3339                 return INPUT_SKIP;
3340
3341         if (*buf)
3342                 parent = atoi(buf) * 10;
3343         parent += c - '0';
3344
3345         if (parent > parents)
3346                 return INPUT_SKIP;
3347         return INPUT_OK;
3348 }
3349
3350 static bool
3351 select_commit_parent(const char *id, char rev[SIZEOF_REV])
3352 {
3353         char buf[SIZEOF_STR * 4];
3354         const char *revlist_argv[] = {
3355                 "git", "rev-list", "-1", "--parents", id, NULL
3356         };
3357         int parents;
3358
3359         if (!run_io_buf(revlist_argv, buf, sizeof(buf)) ||
3360             !*chomp_string(buf) ||
3361             (parents = (strlen(buf) / 40) - 1) < 0) {
3362                 report("Failed to get parent information");
3363                 return FALSE;
3364
3365         } else if (parents == 0) {
3366                 report("The selected commit has no parents");
3367                 return FALSE;
3368         }
3369
3370         if (parents > 1) {
3371                 char prompt[SIZEOF_STR];
3372                 char *result;
3373
3374                 if (!string_format(prompt, "Which parent? [1..%d] ", parents))
3375                         return FALSE;
3376                 result = prompt_input(prompt, select_commit_parent_handler, &parents);
3377                 if (!result)
3378                         return FALSE;
3379                 parents = atoi(result);
3380         }
3381
3382         string_copy_rev(rev, &buf[41 * parents]);
3383         return TRUE;
3384 }
3385
3386 /*
3387  * Pager backend
3388  */
3389
3390 static bool
3391 pager_draw(struct view *view, struct line *line, unsigned int lineno)
3392 {
3393         char *text = line->data;
3394
3395         if (opt_line_number && draw_lineno(view, lineno))
3396                 return TRUE;
3397
3398         draw_text(view, line->type, text, TRUE);
3399         return TRUE;
3400 }
3401
3402 static bool
3403 add_describe_ref(char *buf, size_t *bufpos, const char *commit_id, const char *sep)
3404 {
3405         const char *describe_argv[] = { "git", "describe", commit_id, NULL };
3406         char refbuf[SIZEOF_STR];
3407         char *ref = NULL;
3408
3409         if (run_io_buf(describe_argv, refbuf, sizeof(refbuf)))
3410                 ref = chomp_string(refbuf);
3411
3412         if (!ref || !*ref)
3413                 return TRUE;
3414
3415         /* This is the only fatal call, since it can "corrupt" the buffer. */
3416         if (!string_nformat(buf, SIZEOF_STR, bufpos, "%s%s", sep, ref))
3417                 return FALSE;
3418
3419         return TRUE;
3420 }
3421
3422 static void
3423 add_pager_refs(struct view *view, struct line *line)
3424 {
3425         char buf[SIZEOF_STR];
3426         char *commit_id = (char *)line->data + STRING_SIZE("commit ");
3427         struct ref **refs;
3428         size_t bufpos = 0, refpos = 0;
3429         const char *sep = "Refs: ";
3430         bool is_tag = FALSE;
3431
3432         assert(line->type == LINE_COMMIT);
3433
3434         refs = get_refs(commit_id);
3435         if (!refs) {
3436                 if (view == VIEW(REQ_VIEW_DIFF))
3437                         goto try_add_describe_ref;
3438                 return;
3439         }
3440
3441         do {
3442                 struct ref *ref = refs[refpos];
3443                 const char *fmt = ref->tag    ? "%s[%s]" :
3444                                   ref->remote ? "%s<%s>" : "%s%s";
3445
3446                 if (!string_format_from(buf, &bufpos, fmt, sep, ref->name))
3447                         return;
3448                 sep = ", ";
3449                 if (ref->tag)
3450                         is_tag = TRUE;
3451         } while (refs[refpos++]->next);
3452
3453         if (!is_tag && view == VIEW(REQ_VIEW_DIFF)) {
3454 try_add_describe_ref:
3455                 /* Add <tag>-g<commit_id> "fake" reference. */
3456                 if (!add_describe_ref(buf, &bufpos, commit_id, sep))
3457                         return;
3458         }
3459
3460         if (bufpos == 0)
3461                 return;
3462
3463         add_line_text(view, buf, LINE_PP_REFS);
3464 }
3465
3466 static bool
3467 pager_read(struct view *view, char *data)
3468 {
3469         struct line *line;
3470
3471         if (!data)
3472                 return TRUE;
3473
3474         line = add_line_text(view, data, get_line_type(data));
3475         if (!line)
3476                 return FALSE;
3477
3478         if (line->type == LINE_COMMIT &&
3479             (view == VIEW(REQ_VIEW_DIFF) ||
3480              view == VIEW(REQ_VIEW_LOG)))
3481                 add_pager_refs(view, line);
3482
3483         return TRUE;
3484 }
3485
3486 static enum request
3487 pager_request(struct view *view, enum request request, struct line *line)
3488 {
3489         int split = 0;
3490
3491         if (request != REQ_ENTER)
3492                 return request;
3493
3494         if (line->type == LINE_COMMIT &&
3495            (view == VIEW(REQ_VIEW_LOG) ||
3496             view == VIEW(REQ_VIEW_PAGER))) {
3497                 open_view(view, REQ_VIEW_DIFF, OPEN_SPLIT);
3498                 split = 1;
3499         }
3500
3501         /* Always scroll the view even if it was split. That way
3502          * you can use Enter to scroll through the log view and
3503          * split open each commit diff. */
3504         scroll_view(view, REQ_SCROLL_LINE_DOWN);
3505
3506         /* FIXME: A minor workaround. Scrolling the view will call report("")
3507          * but if we are scrolling a non-current view this won't properly
3508          * update the view title. */
3509         if (split)
3510                 update_view_title(view);
3511
3512         return REQ_NONE;
3513 }
3514
3515 static bool
3516 pager_grep(struct view *view, struct line *line)
3517 {
3518         regmatch_t pmatch;
3519         char *text = line->data;
3520
3521         if (!*text)
3522                 return FALSE;
3523
3524         if (regexec(view->regex, text, 1, &pmatch, 0) == REG_NOMATCH)
3525                 return FALSE;
3526
3527         return TRUE;
3528 }
3529
3530 static void
3531 pager_select(struct view *view, struct line *line)
3532 {
3533         if (line->type == LINE_COMMIT) {
3534                 char *text = (char *)line->data + STRING_SIZE("commit ");
3535
3536                 if (view != VIEW(REQ_VIEW_PAGER))
3537                         string_copy_rev(view->ref, text);
3538                 string_copy_rev(ref_commit, text);
3539         }
3540 }
3541
3542 static struct view_ops pager_ops = {
3543         "line",
3544         NULL,
3545         NULL,
3546         pager_read,
3547         pager_draw,
3548         pager_request,
3549         pager_grep,
3550         pager_select,
3551 };
3552
3553 static const char *log_argv[SIZEOF_ARG] = {
3554         "git", "log", "--no-color", "--cc", "--stat", "-n100", "%(head)", NULL
3555 };
3556
3557 static enum request
3558 log_request(struct view *view, enum request request, struct line *line)
3559 {
3560         switch (request) {
3561         case REQ_REFRESH:
3562                 load_refs();
3563                 open_view(view, REQ_VIEW_LOG, OPEN_REFRESH);
3564                 return REQ_NONE;
3565         default:
3566                 return pager_request(view, request, line);
3567         }
3568 }
3569
3570 static struct view_ops log_ops = {
3571         "line",
3572         log_argv,
3573         NULL,
3574         pager_read,
3575         pager_draw,
3576         log_request,
3577         pager_grep,
3578         pager_select,
3579 };
3580
3581 static const char *diff_argv[SIZEOF_ARG] = {
3582         "git", "show", "--pretty=fuller", "--no-color", "--root",
3583                 "--patch-with-stat", "--find-copies-harder", "-C", "%(commit)", NULL
3584 };
3585
3586 static struct view_ops diff_ops = {
3587         "line",
3588         diff_argv,
3589         NULL,
3590         pager_read,
3591         pager_draw,
3592         pager_request,
3593         pager_grep,
3594         pager_select,
3595 };
3596
3597 /*
3598  * Help backend
3599  */
3600
3601 static bool
3602 help_open(struct view *view)
3603 {
3604         char buf[SIZEOF_STR];
3605         size_t bufpos;
3606         int i;
3607
3608         if (view->lines > 0)
3609                 return TRUE;
3610
3611         add_line_text(view, "Quick reference for tig keybindings:", LINE_DEFAULT);
3612
3613         for (i = 0; i < ARRAY_SIZE(req_info); i++) {
3614                 const char *key;
3615
3616                 if (req_info[i].request == REQ_NONE)
3617                         continue;
3618
3619                 if (!req_info[i].request) {
3620                         add_line_text(view, "", LINE_DEFAULT);
3621                         add_line_text(view, req_info[i].help, LINE_DEFAULT);
3622                         continue;
3623                 }
3624
3625                 key = get_key(req_info[i].request);
3626                 if (!*key)
3627                         key = "(no key defined)";
3628
3629                 for (bufpos = 0; bufpos <= req_info[i].namelen; bufpos++) {
3630                         buf[bufpos] = tolower(req_info[i].name[bufpos]);
3631                         if (buf[bufpos] == '_')
3632                                 buf[bufpos] = '-';
3633                 }
3634
3635                 add_line_format(view, LINE_DEFAULT, "    %-25s %-20s %s",
3636                                 key, buf, req_info[i].help);
3637         }
3638
3639         if (run_requests) {
3640                 add_line_text(view, "", LINE_DEFAULT);
3641                 add_line_text(view, "External commands:", LINE_DEFAULT);
3642         }
3643
3644         for (i = 0; i < run_requests; i++) {
3645                 struct run_request *req = get_run_request(REQ_NONE + i + 1);
3646                 const char *key;
3647                 int argc;
3648
3649                 if (!req)
3650                         continue;
3651
3652                 key = get_key_name(req->key);
3653                 if (!*key)
3654                         key = "(no key defined)";
3655
3656                 for (bufpos = 0, argc = 0; req->argv[argc]; argc++)
3657                         if (!string_format_from(buf, &bufpos, "%s%s",
3658                                                 argc ? " " : "", req->argv[argc]))
3659                                 return REQ_NONE;
3660
3661                 add_line_format(view, LINE_DEFAULT, "    %-10s %-14s `%s`",
3662                                 keymap_table[req->keymap].name, key, buf);
3663         }
3664
3665         return TRUE;
3666 }
3667
3668 static struct view_ops help_ops = {
3669         "line",
3670         NULL,
3671         help_open,
3672         NULL,
3673         pager_draw,
3674         pager_request,
3675         pager_grep,
3676         pager_select,
3677 };
3678
3679
3680 /*
3681  * Tree backend
3682  */
3683
3684 struct tree_stack_entry {
3685         struct tree_stack_entry *prev;  /* Entry below this in the stack */
3686         unsigned long lineno;           /* Line number to restore */
3687         char *name;                     /* Position of name in opt_path */
3688 };
3689
3690 /* The top of the path stack. */
3691 static struct tree_stack_entry *tree_stack = NULL;
3692 unsigned long tree_lineno = 0;
3693
3694 static void
3695 pop_tree_stack_entry(void)
3696 {
3697         struct tree_stack_entry *entry = tree_stack;
3698
3699         tree_lineno = entry->lineno;
3700         entry->name[0] = 0;
3701         tree_stack = entry->prev;
3702         free(entry);
3703 }
3704
3705 static void
3706 push_tree_stack_entry(const char *name, unsigned long lineno)
3707 {
3708         struct tree_stack_entry *entry = calloc(1, sizeof(*entry));
3709         size_t pathlen = strlen(opt_path);
3710
3711         if (!entry)
3712                 return;
3713
3714         entry->prev = tree_stack;
3715         entry->name = opt_path + pathlen;
3716         tree_stack = entry;
3717
3718         if (!string_format_from(opt_path, &pathlen, "%s/", name)) {
3719                 pop_tree_stack_entry();
3720                 return;
3721         }
3722
3723         /* Move the current line to the first tree entry. */
3724         tree_lineno = 1;
3725         entry->lineno = lineno;
3726 }
3727
3728 /* Parse output from git-ls-tree(1):
3729  *
3730  * 100644 blob fb0e31ea6cc679b7379631188190e975f5789c26 Makefile
3731  * 100644 blob 5304ca4260aaddaee6498f9630e7d471b8591ea6 README
3732  * 100644 blob f931e1d229c3e185caad4449bf5b66ed72462657 tig.c
3733  * 100644 blob ed09fe897f3c7c9af90bcf80cae92558ea88ae38 web.conf
3734  */
3735
3736 #define SIZEOF_TREE_ATTR \
3737         STRING_SIZE("100644 blob ed09fe897f3c7c9af90bcf80cae92558ea88ae38\t")
3738
3739 #define SIZEOF_TREE_MODE \
3740         STRING_SIZE("100644 ")
3741
3742 #define TREE_ID_OFFSET \
3743         STRING_SIZE("100644 blob ")
3744
3745 struct tree_entry {
3746         char id[SIZEOF_REV];
3747         mode_t mode;
3748         struct tm time;                 /* Date from the author ident. */
3749         char author[75];                /* Author of the commit. */
3750         char name[1];
3751 };
3752
3753 static const char *
3754 tree_path(struct line *line)
3755 {
3756         return ((struct tree_entry *) line->data)->name;
3757 }
3758
3759
3760 static int
3761 tree_compare_entry(struct line *line1, struct line *line2)
3762 {
3763         if (line1->type != line2->type)
3764                 return line1->type == LINE_TREE_DIR ? -1 : 1;
3765         return strcmp(tree_path(line1), tree_path(line2));
3766 }
3767
3768 static struct line *
3769 tree_entry(struct view *view, enum line_type type, const char *path,
3770            const char *mode, const char *id)
3771 {
3772         struct tree_entry *entry = calloc(1, sizeof(*entry) + strlen(path));
3773         struct line *line = entry ? add_line_data(view, entry, type) : NULL;
3774
3775         if (!entry || !line) {
3776                 free(entry);
3777                 return NULL;
3778         }
3779
3780         strncpy(entry->name, path, strlen(path));
3781         if (mode)
3782                 entry->mode = strtoul(mode, NULL, 8);
3783         if (id)
3784                 string_copy_rev(entry->id, id);
3785
3786         return line;
3787 }
3788
3789 static bool
3790 tree_read_date(struct view *view, char *text, bool *read_date)
3791 {
3792         static char author_name[SIZEOF_STR];
3793         static struct tm author_time;
3794
3795         if (!text && *read_date) {
3796                 *read_date = FALSE;
3797                 return TRUE;
3798
3799         } else if (!text) {
3800                 char *path = *opt_path ? opt_path : ".";
3801                 /* Find next entry to process */
3802                 const char *log_file[] = {
3803                         "git", "log", "--no-color", "--pretty=raw",
3804                                 "--cc", "--raw", view->id, "--", path, NULL
3805                 };
3806                 struct io io = {};
3807
3808                 if (!run_io_rd(&io, log_file, FORMAT_NONE)) {
3809                         report("Failed to load tree data");
3810                         return TRUE;
3811                 }
3812
3813                 done_io(view->pipe);
3814                 view->io = io;
3815                 *read_date = TRUE;
3816                 return FALSE;
3817
3818         } else if (*text == 'a' && get_line_type(text) == LINE_AUTHOR) {
3819                 parse_author_line(text + STRING_SIZE("author "),
3820                                   author_name, sizeof(author_name), &author_time);
3821
3822         } else if (*text == ':') {
3823                 char *pos;
3824                 size_t annotated = 1;
3825                 size_t i;
3826
3827                 pos = strchr(text, '\t');
3828                 if (!pos)
3829                         return TRUE;
3830                 text = pos + 1;
3831                 if (*opt_prefix && !strncmp(text, opt_prefix, strlen(opt_prefix)))
3832                         text += strlen(opt_prefix);
3833                 if (*opt_path && !strncmp(text, opt_path, strlen(opt_path)))
3834                         text += strlen(opt_path);
3835                 pos = strchr(text, '/');
3836                 if (pos)
3837                         *pos = 0;
3838
3839                 for (i = 1; i < view->lines; i++) {
3840                         struct line *line = &view->line[i];
3841                         struct tree_entry *entry = line->data;
3842
3843                         annotated += !!*entry->author;
3844                         if (*entry->author || strcmp(entry->name, text))
3845                                 continue;
3846
3847                         string_copy(entry->author, author_name);
3848                         memcpy(&entry->time, &author_time, sizeof(entry->time));
3849                         line->dirty = 1;
3850                         break;
3851                 }
3852
3853                 if (annotated == view->lines)
3854                         kill_io(view->pipe);
3855         }
3856         return TRUE;
3857 }
3858
3859 static bool
3860 tree_read(struct view *view, char *text)
3861 {
3862         static bool read_date = FALSE;
3863         struct tree_entry *data;
3864         struct line *entry, *line;
3865         enum line_type type;
3866         size_t textlen = text ? strlen(text) : 0;
3867         char *path = text + SIZEOF_TREE_ATTR;
3868
3869         if (read_date || !text)
3870                 return tree_read_date(view, text, &read_date);
3871
3872         if (textlen <= SIZEOF_TREE_ATTR)
3873                 return FALSE;
3874         if (view->lines == 0 &&
3875             !tree_entry(view, LINE_TREE_PARENT, opt_path, NULL, NULL))
3876                 return FALSE;
3877
3878         /* Strip the path part ... */
3879         if (*opt_path) {
3880                 size_t pathlen = textlen - SIZEOF_TREE_ATTR;
3881                 size_t striplen = strlen(opt_path);
3882
3883                 if (pathlen > striplen)
3884                         memmove(path, path + striplen,
3885                                 pathlen - striplen + 1);
3886
3887                 /* Insert "link" to parent directory. */
3888                 if (view->lines == 1 &&
3889                     !tree_entry(view, LINE_TREE_DIR, "..", "040000", view->ref))
3890                         return FALSE;
3891         }
3892
3893         type = text[SIZEOF_TREE_MODE] == 't' ? LINE_TREE_DIR : LINE_TREE_FILE;
3894         entry = tree_entry(view, type, path, text, text + TREE_ID_OFFSET);
3895         if (!entry)
3896                 return FALSE;
3897         data = entry->data;
3898
3899         /* Skip "Directory ..." and ".." line. */
3900         for (line = &view->line[1 + !!*opt_path]; line < entry; line++) {
3901                 if (tree_compare_entry(line, entry) <= 0)
3902                         continue;
3903
3904                 memmove(line + 1, line, (entry - line) * sizeof(*entry));
3905
3906                 line->data = data;
3907                 line->type = type;
3908                 for (; line <= entry; line++)
3909                         line->dirty = line->cleareol = 1;
3910                 return TRUE;
3911         }
3912
3913         if (tree_lineno > view->lineno) {
3914                 view->lineno = tree_lineno;
3915                 tree_lineno = 0;
3916         }
3917
3918         return TRUE;
3919 }
3920
3921 static bool
3922 tree_draw(struct view *view, struct line *line, unsigned int lineno)
3923 {
3924         struct tree_entry *entry = line->data;
3925
3926         if (line->type == LINE_TREE_PARENT) {
3927                 if (draw_text(view, line->type, "Directory path /", TRUE))
3928                         return TRUE;
3929         } else {
3930                 char mode[11] = "-r--r--r--";
3931
3932                 if (S_ISDIR(entry->mode)) {
3933                         mode[3] = mode[6] = mode[9] = 'x';
3934                         mode[0] = 'd';
3935                 }
3936                 if (S_ISLNK(entry->mode))
3937                         mode[0] = 'l';
3938                 if (entry->mode & S_IWUSR)
3939                         mode[2] = 'w';
3940                 if (entry->mode & S_IXUSR)
3941                         mode[3] = 'x';
3942                 if (entry->mode & S_IXGRP)
3943                         mode[6] = 'x';
3944                 if (entry->mode & S_IXOTH)
3945                         mode[9] = 'x';
3946                 if (draw_field(view, LINE_TREE_MODE, mode, 11, TRUE))
3947                         return TRUE;
3948
3949                 if (opt_author &&
3950                     draw_field(view, LINE_MAIN_AUTHOR, entry->author, opt_author_cols, TRUE))
3951                         return TRUE;
3952
3953                 if (opt_date && draw_date(view, *entry->author ? &entry->time : NULL))
3954                         return TRUE;
3955         }
3956         if (draw_text(view, line->type, entry->name, TRUE))
3957                 return TRUE;
3958         return TRUE;
3959 }
3960
3961 static void
3962 open_blob_editor()
3963 {
3964         char file[SIZEOF_STR] = "/tmp/tigblob.XXXXXX";
3965         int fd = mkstemp(file);
3966
3967         if (fd == -1)
3968                 report("Failed to create temporary file");
3969         else if (!run_io_append(blob_ops.argv, FORMAT_ALL, fd))
3970                 report("Failed to save blob data to file");
3971         else
3972                 open_editor(FALSE, file);
3973         if (fd != -1)
3974                 unlink(file);
3975 }
3976
3977 static enum request
3978 tree_request(struct view *view, enum request request, struct line *line)
3979 {
3980         enum open_flags flags;
3981
3982         switch (request) {
3983         case REQ_VIEW_BLAME:
3984                 if (line->type != LINE_TREE_FILE) {
3985                         report("Blame only supported for files");
3986                         return REQ_NONE;
3987                 }
3988
3989                 string_copy(opt_ref, view->vid);
3990                 return request;
3991
3992         case REQ_EDIT:
3993                 if (line->type != LINE_TREE_FILE) {
3994                         report("Edit only supported for files");
3995                 } else if (!is_head_commit(view->vid)) {
3996                         open_blob_editor();
3997                 } else {
3998                         open_editor(TRUE, opt_file);
3999                 }
4000                 return REQ_NONE;
4001
4002         case REQ_PARENT:
4003                 if (!*opt_path) {
4004                         /* quit view if at top of tree */
4005                         return REQ_VIEW_CLOSE;
4006                 }
4007                 /* fake 'cd  ..' */
4008                 line = &view->line[1];
4009                 break;
4010
4011         case REQ_ENTER:
4012                 break;
4013
4014         default:
4015                 return request;
4016         }
4017
4018         /* Cleanup the stack if the tree view is at a different tree. */
4019         while (!*opt_path && tree_stack)
4020                 pop_tree_stack_entry();
4021
4022         switch (line->type) {
4023         case LINE_TREE_DIR:
4024                 /* Depending on whether it is a subdir or parent (updir?) link
4025                  * mangle the path buffer. */
4026                 if (line == &view->line[1] && *opt_path) {
4027                         pop_tree_stack_entry();
4028
4029                 } else {
4030                         const char *basename = tree_path(line);
4031
4032                         push_tree_stack_entry(basename, view->lineno);
4033                 }
4034
4035                 /* Trees and subtrees share the same ID, so they are not not
4036                  * unique like blobs. */
4037                 flags = OPEN_RELOAD;
4038                 request = REQ_VIEW_TREE;
4039                 break;
4040
4041         case LINE_TREE_FILE:
4042                 flags = display[0] == view ? OPEN_SPLIT : OPEN_DEFAULT;
4043                 request = REQ_VIEW_BLOB;
4044                 break;
4045
4046         default:
4047                 return REQ_NONE;
4048         }
4049
4050         open_view(view, request, flags);
4051         if (request == REQ_VIEW_TREE)
4052                 view->lineno = tree_lineno;
4053
4054         return REQ_NONE;
4055 }
4056
4057 static void
4058 tree_select(struct view *view, struct line *line)
4059 {
4060         struct tree_entry *entry = line->data;
4061
4062         if (line->type == LINE_TREE_FILE) {
4063                 string_copy_rev(ref_blob, entry->id);
4064                 string_format(opt_file, "%s%s", opt_path, tree_path(line));
4065
4066         } else if (line->type != LINE_TREE_DIR) {
4067                 return;
4068         }
4069
4070         string_copy_rev(view->ref, entry->id);
4071 }
4072
4073 static const char *tree_argv[SIZEOF_ARG] = {
4074         "git", "ls-tree", "%(commit)", "%(directory)", NULL
4075 };
4076
4077 static struct view_ops tree_ops = {
4078         "file",
4079         tree_argv,
4080         NULL,
4081         tree_read,
4082         tree_draw,
4083         tree_request,
4084         pager_grep,
4085         tree_select,
4086 };
4087
4088 static bool
4089 blob_read(struct view *view, char *line)
4090 {
4091         if (!line)
4092                 return TRUE;
4093         return add_line_text(view, line, LINE_DEFAULT) != NULL;
4094 }
4095
4096 static enum request
4097 blob_request(struct view *view, enum request request, struct line *line)
4098 {
4099         switch (request) {
4100         case REQ_EDIT:
4101                 open_blob_editor();
4102                 return REQ_NONE;
4103         default:
4104                 return pager_request(view, request, line);
4105         }
4106 }
4107
4108 static const char *blob_argv[SIZEOF_ARG] = {
4109         "git", "cat-file", "blob", "%(blob)", NULL
4110 };
4111
4112 static struct view_ops blob_ops = {
4113         "line",
4114         blob_argv,
4115         NULL,
4116         blob_read,
4117         pager_draw,
4118         blob_request,
4119         pager_grep,
4120         pager_select,
4121 };
4122
4123 /*
4124  * Blame backend
4125  *
4126  * Loading the blame view is a two phase job:
4127  *
4128  *  1. File content is read either using opt_file from the
4129  *     filesystem or using git-cat-file.
4130  *  2. Then blame information is incrementally added by
4131  *     reading output from git-blame.
4132  */
4133
4134 static const char *blame_head_argv[] = {
4135         "git", "blame", "--incremental", "--", "%(file)", NULL
4136 };
4137
4138 static const char *blame_ref_argv[] = {
4139         "git", "blame", "--incremental", "%(ref)", "--", "%(file)", NULL
4140 };
4141
4142 static const char *blame_cat_file_argv[] = {
4143         "git", "cat-file", "blob", "%(ref):%(file)", NULL
4144 };
4145
4146 struct blame_commit {
4147         char id[SIZEOF_REV];            /* SHA1 ID. */
4148         char title[128];                /* First line of the commit message. */
4149         char author[75];                /* Author of the commit. */
4150         struct tm time;                 /* Date from the author ident. */
4151         char filename[128];             /* Name of file. */
4152         bool has_previous;              /* Was a "previous" line detected. */
4153 };
4154
4155 struct blame {
4156         struct blame_commit *commit;
4157         char text[1];
4158 };
4159
4160 static bool
4161 blame_open(struct view *view)
4162 {
4163         if (*opt_ref || !io_open(&view->io, opt_file)) {
4164                 if (!run_io_rd(&view->io, blame_cat_file_argv, FORMAT_ALL))
4165                         return FALSE;
4166         }
4167
4168         setup_update(view, opt_file);
4169         string_format(view->ref, "%s ...", opt_file);
4170
4171         return TRUE;
4172 }
4173
4174 static struct blame_commit *
4175 get_blame_commit(struct view *view, const char *id)
4176 {
4177         size_t i;
4178
4179         for (i = 0; i < view->lines; i++) {
4180                 struct blame *blame = view->line[i].data;
4181
4182                 if (!blame->commit)
4183                         continue;
4184
4185                 if (!strncmp(blame->commit->id, id, SIZEOF_REV - 1))
4186                         return blame->commit;
4187         }
4188
4189         {
4190                 struct blame_commit *commit = calloc(1, sizeof(*commit));
4191
4192                 if (commit)
4193                         string_ncopy(commit->id, id, SIZEOF_REV);
4194                 return commit;
4195         }
4196 }
4197
4198 static bool
4199 parse_number(const char **posref, size_t *number, size_t min, size_t max)
4200 {
4201         const char *pos = *posref;
4202
4203         *posref = NULL;
4204         pos = strchr(pos + 1, ' ');
4205         if (!pos || !isdigit(pos[1]))
4206                 return FALSE;
4207         *number = atoi(pos + 1);
4208         if (*number < min || *number > max)
4209                 return FALSE;
4210
4211         *posref = pos;
4212         return TRUE;
4213 }
4214
4215 static struct blame_commit *
4216 parse_blame_commit(struct view *view, const char *text, int *blamed)
4217 {
4218         struct blame_commit *commit;
4219         struct blame *blame;
4220         const char *pos = text + SIZEOF_REV - 1;
4221         size_t lineno;
4222         size_t group;
4223
4224         if (strlen(text) <= SIZEOF_REV || *pos != ' ')
4225                 return NULL;
4226
4227         if (!parse_number(&pos, &lineno, 1, view->lines) ||
4228             !parse_number(&pos, &group, 1, view->lines - lineno + 1))
4229                 return NULL;
4230
4231         commit = get_blame_commit(view, text);
4232         if (!commit)
4233                 return NULL;
4234
4235         *blamed += group;
4236         while (group--) {
4237                 struct line *line = &view->line[lineno + group - 1];
4238
4239                 blame = line->data;
4240                 blame->commit = commit;
4241                 line->dirty = 1;
4242         }
4243
4244         return commit;
4245 }
4246
4247 static bool
4248 blame_read_file(struct view *view, const char *line, bool *read_file)
4249 {
4250         if (!line) {
4251                 const char **argv = *opt_ref ? blame_ref_argv : blame_head_argv;
4252                 struct io io = {};
4253
4254                 if (view->lines == 0 && !view->parent)
4255                         die("No blame exist for %s", view->vid);
4256
4257                 if (view->lines == 0 || !run_io_rd(&io, argv, FORMAT_ALL)) {
4258                         report("Failed to load blame data");
4259                         return TRUE;
4260                 }
4261
4262                 done_io(view->pipe);
4263                 view->io = io;
4264                 *read_file = FALSE;
4265                 return FALSE;
4266
4267         } else {
4268                 size_t linelen = strlen(line);
4269                 struct blame *blame = malloc(sizeof(*blame) + linelen);
4270
4271                 blame->commit = NULL;
4272                 strncpy(blame->text, line, linelen);
4273                 blame->text[linelen] = 0;
4274                 return add_line_data(view, blame, LINE_BLAME_ID) != NULL;
4275         }
4276 }
4277
4278 static bool
4279 match_blame_header(const char *name, char **line)
4280 {
4281         size_t namelen = strlen(name);
4282         bool matched = !strncmp(name, *line, namelen);
4283
4284         if (matched)
4285                 *line += namelen;
4286
4287         return matched;
4288 }
4289
4290 static bool
4291 blame_read(struct view *view, char *line)
4292 {
4293         static struct blame_commit *commit = NULL;
4294         static int blamed = 0;
4295         static time_t author_time;
4296         static bool read_file = TRUE;
4297
4298         if (read_file)
4299                 return blame_read_file(view, line, &read_file);
4300
4301         if (!line) {
4302                 /* Reset all! */
4303                 commit = NULL;
4304                 blamed = 0;
4305                 read_file = TRUE;
4306                 string_format(view->ref, "%s", view->vid);
4307                 if (view_is_displayed(view)) {
4308                         update_view_title(view);
4309                         redraw_view_from(view, 0);
4310                 }
4311                 return TRUE;
4312         }
4313
4314         if (!commit) {
4315                 commit = parse_blame_commit(view, line, &blamed);
4316                 string_format(view->ref, "%s %2d%%", view->vid,
4317                               view->lines ? blamed * 100 / view->lines : 0);
4318
4319         } else if (match_blame_header("author ", &line)) {
4320                 string_ncopy(commit->author, line, strlen(line));
4321
4322         } else if (match_blame_header("author-time ", &line)) {
4323                 author_time = (time_t) atol(line);
4324
4325         } else if (match_blame_header("author-tz ", &line)) {
4326                 long tz;
4327
4328                 tz  = ('0' - line[1]) * 60 * 60 * 10;
4329                 tz += ('0' - line[2]) * 60 * 60;
4330                 tz += ('0' - line[3]) * 60;
4331                 tz += ('0' - line[4]) * 60;
4332
4333                 if (line[0] == '-')
4334                         tz = -tz;
4335
4336                 author_time -= tz;
4337                 gmtime_r(&author_time, &commit->time);
4338
4339         } else if (match_blame_header("summary ", &line)) {
4340                 string_ncopy(commit->title, line, strlen(line));
4341
4342         } else if (match_blame_header("previous ", &line)) {
4343                 commit->has_previous = TRUE;
4344
4345         } else if (match_blame_header("filename ", &line)) {
4346                 string_ncopy(commit->filename, line, strlen(line));
4347                 commit = NULL;
4348         }
4349
4350         return TRUE;
4351 }
4352
4353 static bool
4354 blame_draw(struct view *view, struct line *line, unsigned int lineno)
4355 {
4356         struct blame *blame = line->data;
4357         struct tm *time = NULL;
4358         const char *id = NULL, *author = NULL;
4359
4360         if (blame->commit && *blame->commit->filename) {
4361                 id = blame->commit->id;
4362                 author = blame->commit->author;
4363                 time = &blame->commit->time;
4364         }
4365
4366         if (opt_date && draw_date(view, time))
4367                 return TRUE;
4368
4369         if (opt_author &&
4370             draw_field(view, LINE_MAIN_AUTHOR, author, opt_author_cols, TRUE))
4371                 return TRUE;
4372
4373         if (draw_field(view, LINE_BLAME_ID, id, ID_COLS, FALSE))
4374                 return TRUE;
4375
4376         if (draw_lineno(view, lineno))
4377                 return TRUE;
4378
4379         draw_text(view, LINE_DEFAULT, blame->text, TRUE);
4380         return TRUE;
4381 }
4382
4383 static bool
4384 check_blame_commit(struct blame *blame)
4385 {
4386         if (!blame->commit)
4387                 report("Commit data not loaded yet");
4388         else if (!strcmp(blame->commit->id, NULL_ID))
4389                 report("No commit exist for the selected line");
4390         else
4391                 return TRUE;
4392         return FALSE;
4393 }
4394
4395 static enum request
4396 blame_request(struct view *view, enum request request, struct line *line)
4397 {
4398         enum open_flags flags = display[0] == view ? OPEN_SPLIT : OPEN_DEFAULT;
4399         struct blame *blame = line->data;
4400
4401         switch (request) {
4402         case REQ_VIEW_BLAME:
4403                 if (check_blame_commit(blame)) {
4404                         string_copy(opt_ref, blame->commit->id);
4405                         open_view(view, REQ_VIEW_BLAME, OPEN_REFRESH);
4406                 }
4407                 break;
4408
4409         case REQ_PARENT:
4410                 if (check_blame_commit(blame) &&
4411                     select_commit_parent(blame->commit->id, opt_ref))
4412                         open_view(view, REQ_VIEW_BLAME, OPEN_REFRESH);
4413                 break;
4414
4415         case REQ_ENTER:
4416                 if (!blame->commit) {
4417                         report("No commit loaded yet");
4418                         break;
4419                 }
4420
4421                 if (view_is_displayed(VIEW(REQ_VIEW_DIFF)) &&
4422                     !strcmp(blame->commit->id, VIEW(REQ_VIEW_DIFF)->ref))
4423                         break;
4424
4425                 if (!strcmp(blame->commit->id, NULL_ID)) {
4426                         struct view *diff = VIEW(REQ_VIEW_DIFF);
4427                         const char *diff_index_argv[] = {
4428                                 "git", "diff-index", "--root", "--patch-with-stat",
4429                                         "-C", "-M", "HEAD", "--", view->vid, NULL
4430                         };
4431
4432                         if (!blame->commit->has_previous) {
4433                                 diff_index_argv[1] = "diff";
4434                                 diff_index_argv[2] = "--no-color";
4435                                 diff_index_argv[6] = "--";
4436                                 diff_index_argv[7] = "/dev/null";
4437                         }
4438
4439                         if (!prepare_update(diff, diff_index_argv, NULL, FORMAT_DASH)) {
4440                                 report("Failed to allocate diff command");
4441                                 break;
4442                         }
4443                         flags |= OPEN_PREPARED;
4444                 }
4445
4446                 open_view(view, REQ_VIEW_DIFF, flags);
4447                 if (VIEW(REQ_VIEW_DIFF)->pipe && !strcmp(blame->commit->id, NULL_ID))
4448                         string_copy_rev(VIEW(REQ_VIEW_DIFF)->ref, NULL_ID);
4449                 break;
4450
4451         default:
4452                 return request;
4453         }
4454
4455         return REQ_NONE;
4456 }
4457
4458 static bool
4459 blame_grep(struct view *view, struct line *line)
4460 {
4461         struct blame *blame = line->data;
4462         struct blame_commit *commit = blame->commit;
4463         regmatch_t pmatch;
4464
4465 #define MATCH(text, on)                                                 \
4466         (on && *text && regexec(view->regex, text, 1, &pmatch, 0) != REG_NOMATCH)
4467
4468         if (commit) {
4469                 char buf[DATE_COLS + 1];
4470
4471                 if (MATCH(commit->title, 1) ||
4472                     MATCH(commit->author, opt_author) ||
4473                     MATCH(commit->id, opt_date))
4474                         return TRUE;
4475
4476                 if (strftime(buf, sizeof(buf), DATE_FORMAT, &commit->time) &&
4477                     MATCH(buf, 1))
4478                         return TRUE;
4479         }
4480
4481         return MATCH(blame->text, 1);
4482
4483 #undef MATCH
4484 }
4485
4486 static void
4487 blame_select(struct view *view, struct line *line)
4488 {
4489         struct blame *blame = line->data;
4490         struct blame_commit *commit = blame->commit;
4491
4492         if (!commit)
4493                 return;
4494
4495         if (!strcmp(commit->id, NULL_ID))
4496                 string_ncopy(ref_commit, "HEAD", 4);
4497         else
4498                 string_copy_rev(ref_commit, commit->id);
4499 }
4500
4501 static struct view_ops blame_ops = {
4502         "line",
4503         NULL,
4504         blame_open,
4505         blame_read,
4506         blame_draw,
4507         blame_request,
4508         blame_grep,
4509         blame_select,
4510 };
4511
4512 /*
4513  * Status backend
4514  */
4515
4516 struct status {
4517         char status;
4518         struct {
4519                 mode_t mode;
4520                 char rev[SIZEOF_REV];
4521                 char name[SIZEOF_STR];
4522         } old;
4523         struct {
4524                 mode_t mode;
4525                 char rev[SIZEOF_REV];
4526                 char name[SIZEOF_STR];
4527         } new;
4528 };
4529
4530 static char status_onbranch[SIZEOF_STR];
4531 static struct status stage_status;
4532 static enum line_type stage_line_type;
4533 static size_t stage_chunks;
4534 static int *stage_chunk;
4535
4536 /* This should work even for the "On branch" line. */
4537 static inline bool
4538 status_has_none(struct view *view, struct line *line)
4539 {
4540         return line < view->line + view->lines && !line[1].data;
4541 }
4542
4543 /* Get fields from the diff line:
4544  * :100644 100644 06a5d6ae9eca55be2e0e585a152e6b1336f2b20e 0000000000000000000000000000000000000000 M
4545  */
4546 static inline bool
4547 status_get_diff(struct status *file, const char *buf, size_t bufsize)
4548 {
4549         const char *old_mode = buf +  1;
4550         const char *new_mode = buf +  8;
4551         const char *old_rev  = buf + 15;
4552         const char *new_rev  = buf + 56;
4553         const char *status   = buf + 97;
4554
4555         if (bufsize < 98 ||
4556             old_mode[-1] != ':' ||
4557             new_mode[-1] != ' ' ||
4558             old_rev[-1]  != ' ' ||
4559             new_rev[-1]  != ' ' ||
4560             status[-1]   != ' ')
4561                 return FALSE;
4562
4563         file->status = *status;
4564
4565         string_copy_rev(file->old.rev, old_rev);
4566         string_copy_rev(file->new.rev, new_rev);
4567
4568         file->old.mode = strtoul(old_mode, NULL, 8);
4569         file->new.mode = strtoul(new_mode, NULL, 8);
4570
4571         file->old.name[0] = file->new.name[0] = 0;
4572
4573         return TRUE;
4574 }
4575
4576 static bool
4577 status_run(struct view *view, const char *argv[], char status, enum line_type type)
4578 {
4579         struct status *file = NULL;
4580         struct status *unmerged = NULL;
4581         char *buf;
4582         struct io io = {};
4583
4584         if (!run_io(&io, argv, NULL, IO_RD))
4585                 return FALSE;
4586
4587         add_line_data(view, NULL, type);
4588
4589         while ((buf = io_get(&io, 0, TRUE))) {
4590                 if (!file) {
4591                         file = calloc(1, sizeof(*file));
4592                         if (!file || !add_line_data(view, file, type))
4593                                 goto error_out;
4594                 }
4595
4596                 /* Parse diff info part. */
4597                 if (status) {
4598                         file->status = status;
4599                         if (status == 'A')
4600                                 string_copy(file->old.rev, NULL_ID);
4601
4602                 } else if (!file->status) {
4603                         if (!status_get_diff(file, buf, strlen(buf)))
4604                                 goto error_out;
4605
4606                         buf = io_get(&io, 0, TRUE);
4607                         if (!buf)
4608                                 break;
4609
4610                         /* Collapse all 'M'odified entries that follow a
4611                          * associated 'U'nmerged entry. */
4612                         if (file->status == 'U') {
4613                                 unmerged = file;
4614
4615                         } else if (unmerged) {
4616                                 int collapse = !strcmp(buf, unmerged->new.name);
4617
4618                                 unmerged = NULL;
4619                                 if (collapse) {
4620                                         free(file);
4621                                         file = NULL;
4622                                         view->lines--;
4623                                         continue;
4624                                 }
4625                         }
4626                 }
4627
4628                 /* Grab the old name for rename/copy. */
4629                 if (!*file->old.name &&
4630                     (file->status == 'R' || file->status == 'C')) {
4631                         string_ncopy(file->old.name, buf, strlen(buf));
4632
4633                         buf = io_get(&io, 0, TRUE);
4634                         if (!buf)
4635                                 break;
4636                 }
4637
4638                 /* git-ls-files just delivers a NUL separated list of
4639                  * file names similar to the second half of the
4640                  * git-diff-* output. */
4641                 string_ncopy(file->new.name, buf, strlen(buf));
4642                 if (!*file->old.name)
4643                         string_copy(file->old.name, file->new.name);
4644                 file = NULL;
4645         }
4646
4647         if (io_error(&io)) {
4648 error_out:
4649                 done_io(&io);
4650                 return FALSE;
4651         }
4652
4653         if (!view->line[view->lines - 1].data)
4654                 add_line_data(view, NULL, LINE_STAT_NONE);
4655
4656         done_io(&io);
4657         return TRUE;
4658 }
4659
4660 /* Don't show unmerged entries in the staged section. */
4661 static const char *status_diff_index_argv[] = {
4662         "git", "diff-index", "-z", "--diff-filter=ACDMRTXB",
4663                              "--cached", "-M", "HEAD", NULL
4664 };
4665
4666 static const char *status_diff_files_argv[] = {
4667         "git", "diff-files", "-z", NULL
4668 };
4669
4670 static const char *status_list_other_argv[] = {
4671         "git", "ls-files", "-z", "--others", "--exclude-standard", NULL
4672 };
4673
4674 static const char *status_list_no_head_argv[] = {
4675         "git", "ls-files", "-z", "--cached", "--exclude-standard", NULL
4676 };
4677
4678 static const char *update_index_argv[] = {
4679         "git", "update-index", "-q", "--unmerged", "--refresh", NULL
4680 };
4681
4682 /* Restore the previous line number to stay in the context or select a
4683  * line with something that can be updated. */
4684 static void
4685 status_restore(struct view *view)
4686 {
4687         if (view->p_lineno >= view->lines)
4688                 view->p_lineno = view->lines - 1;
4689         while (view->p_lineno < view->lines && !view->line[view->p_lineno].data)
4690                 view->p_lineno++;
4691         while (view->p_lineno > 0 && !view->line[view->p_lineno].data)
4692                 view->p_lineno--;
4693
4694         /* If the above fails, always skip the "On branch" line. */
4695         if (view->p_lineno < view->lines)
4696                 view->lineno = view->p_lineno;
4697         else
4698                 view->lineno = 1;
4699
4700         if (view->lineno < view->offset)
4701                 view->offset = view->lineno;
4702         else if (view->offset + view->height <= view->lineno)
4703                 view->offset = view->lineno - view->height + 1;
4704
4705         view->p_restore = FALSE;
4706 }
4707
4708 /* First parse staged info using git-diff-index(1), then parse unstaged
4709  * info using git-diff-files(1), and finally untracked files using
4710  * git-ls-files(1). */
4711 static bool
4712 status_open(struct view *view)
4713 {
4714         reset_view(view);
4715
4716         add_line_data(view, NULL, LINE_STAT_HEAD);
4717         if (is_initial_commit())
4718                 string_copy(status_onbranch, "Initial commit");
4719         else if (!*opt_head)
4720                 string_copy(status_onbranch, "Not currently on any branch");
4721         else if (!string_format(status_onbranch, "On branch %s", opt_head))
4722                 return FALSE;
4723
4724         run_io_bg(update_index_argv);
4725
4726         if (is_initial_commit()) {
4727                 if (!status_run(view, status_list_no_head_argv, 'A', LINE_STAT_STAGED))
4728                         return FALSE;
4729         } else if (!status_run(view, status_diff_index_argv, 0, LINE_STAT_STAGED)) {
4730                 return FALSE;
4731         }
4732
4733         if (!status_run(view, status_diff_files_argv, 0, LINE_STAT_UNSTAGED) ||
4734             !status_run(view, status_list_other_argv, '?', LINE_STAT_UNTRACKED))
4735                 return FALSE;
4736
4737         /* Restore the exact position or use the specialized restore
4738          * mode? */
4739         if (!view->p_restore)
4740                 status_restore(view);
4741         return TRUE;
4742 }
4743
4744 static bool
4745 status_draw(struct view *view, struct line *line, unsigned int lineno)
4746 {
4747         struct status *status = line->data;
4748         enum line_type type;
4749         const char *text;
4750
4751         if (!status) {
4752                 switch (line->type) {
4753                 case LINE_STAT_STAGED:
4754                         type = LINE_STAT_SECTION;
4755                         text = "Changes to be committed:";
4756                         break;
4757
4758                 case LINE_STAT_UNSTAGED:
4759                         type = LINE_STAT_SECTION;
4760                         text = "Changed but not updated:";
4761                         break;
4762
4763                 case LINE_STAT_UNTRACKED:
4764                         type = LINE_STAT_SECTION;
4765                         text = "Untracked files:";
4766                         break;
4767
4768                 case LINE_STAT_NONE:
4769                         type = LINE_DEFAULT;
4770                         text = "    (no files)";
4771                         break;
4772
4773                 case LINE_STAT_HEAD:
4774                         type = LINE_STAT_HEAD;
4775                         text = status_onbranch;
4776                         break;
4777
4778                 default:
4779                         return FALSE;
4780                 }
4781         } else {
4782                 static char buf[] = { '?', ' ', ' ', ' ', 0 };
4783
4784                 buf[0] = status->status;
4785                 if (draw_text(view, line->type, buf, TRUE))
4786                         return TRUE;
4787                 type = LINE_DEFAULT;
4788                 text = status->new.name;
4789         }