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