Refactor main_read to create parse_author_line
[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_(VIEW_NEXT,         "Move focus to next view"), \
670         REQ_(REFRESH,           "Reload and refresh"), \
671         REQ_(MAXIMIZE,          "Maximize the current view"), \
672         REQ_(VIEW_CLOSE,        "Close the current view"), \
673         REQ_(QUIT,              "Close all views and quit"), \
674         \
675         REQ_GROUP("View specific requests") \
676         REQ_(STATUS_UPDATE,     "Update file status"), \
677         REQ_(STATUS_REVERT,     "Revert file changes"), \
678         REQ_(STATUS_MERGE,      "Merge file using external tool"), \
679         REQ_(STAGE_NEXT,        "Find next chunk to stage"), \
680         REQ_(TREE_PARENT,       "Switch to parent directory in tree view"), \
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_git_dir[SIZEOF_STR]     = "";
801 static signed char opt_is_inside_work_tree      = -1; /* set to TRUE or FALSE */
802 static char opt_editor[SIZEOF_STR]      = "";
803 static FILE *opt_tty                    = NULL;
804
805 #define is_initial_commit()     (!*opt_head_rev)
806 #define is_head_commit(rev)     (!strcmp((rev), "HEAD") || !strcmp(opt_head_rev, (rev)))
807
808 static enum request
809 parse_options(int argc, const char *argv[], const char ***run_argv)
810 {
811         enum request request = REQ_VIEW_MAIN;
812         const char *subcommand;
813         bool seen_dashdash = FALSE;
814         /* XXX: This is vulnerable to the user overriding options
815          * required for the main view parser. */
816         static const char *custom_argv[SIZEOF_ARG] = {
817                 "git", "log", "--no-color", "--pretty=raw", "--parents",
818                         "--topo-order", NULL
819         };
820         int i, j = 6;
821
822         if (!isatty(STDIN_FILENO))
823                 return REQ_VIEW_PAGER;
824
825         if (argc <= 1)
826                 return REQ_VIEW_MAIN;
827
828         subcommand = argv[1];
829         if (!strcmp(subcommand, "status") || !strcmp(subcommand, "-S")) {
830                 if (!strcmp(subcommand, "-S"))
831                         warn("`-S' has been deprecated; use `tig status' instead");
832                 if (argc > 2)
833                         warn("ignoring arguments after `%s'", subcommand);
834                 return REQ_VIEW_STATUS;
835
836         } else if (!strcmp(subcommand, "blame")) {
837                 if (argc <= 2 || argc > 4)
838                         die("invalid number of options to blame\n\n%s", usage);
839
840                 i = 2;
841                 if (argc == 4) {
842                         string_ncopy(opt_ref, argv[i], strlen(argv[i]));
843                         i++;
844                 }
845
846                 string_ncopy(opt_file, argv[i], strlen(argv[i]));
847                 return REQ_VIEW_BLAME;
848
849         } else if (!strcmp(subcommand, "show")) {
850                 request = REQ_VIEW_DIFF;
851
852         } else if (!strcmp(subcommand, "log") || !strcmp(subcommand, "diff")) {
853                 request = subcommand[0] == 'l' ? REQ_VIEW_LOG : REQ_VIEW_DIFF;
854                 warn("`tig %s' has been deprecated", subcommand);
855
856         } else {
857                 subcommand = NULL;
858         }
859
860         if (subcommand) {
861                 custom_argv[1] = subcommand;
862                 j = 2;
863         }
864
865         for (i = 1 + !!subcommand; i < argc; i++) {
866                 const char *opt = argv[i];
867
868                 if (seen_dashdash || !strcmp(opt, "--")) {
869                         seen_dashdash = TRUE;
870
871                 } else if (!strcmp(opt, "-v") || !strcmp(opt, "--version")) {
872                         printf("tig version %s\n", TIG_VERSION);
873                         return REQ_NONE;
874
875                 } else if (!strcmp(opt, "-h") || !strcmp(opt, "--help")) {
876                         printf("%s\n", usage);
877                         return REQ_NONE;
878                 }
879
880                 custom_argv[j++] = opt;
881                 if (j >= ARRAY_SIZE(custom_argv))
882                         die("command too long");
883         }
884
885         custom_argv[j] = NULL;
886         *run_argv = custom_argv;
887
888         return request;
889 }
890
891
892 /*
893  * Line-oriented content detection.
894  */
895
896 #define LINE_INFO \
897 LINE(DIFF_HEADER,  "diff --git ",       COLOR_YELLOW,   COLOR_DEFAULT,  0), \
898 LINE(DIFF_CHUNK,   "@@",                COLOR_MAGENTA,  COLOR_DEFAULT,  0), \
899 LINE(DIFF_ADD,     "+",                 COLOR_GREEN,    COLOR_DEFAULT,  0), \
900 LINE(DIFF_DEL,     "-",                 COLOR_RED,      COLOR_DEFAULT,  0), \
901 LINE(DIFF_INDEX,        "index ",         COLOR_BLUE,   COLOR_DEFAULT,  0), \
902 LINE(DIFF_OLDMODE,      "old file mode ", COLOR_YELLOW, COLOR_DEFAULT,  0), \
903 LINE(DIFF_NEWMODE,      "new file mode ", COLOR_YELLOW, COLOR_DEFAULT,  0), \
904 LINE(DIFF_COPY_FROM,    "copy from",      COLOR_YELLOW, COLOR_DEFAULT,  0), \
905 LINE(DIFF_COPY_TO,      "copy to",        COLOR_YELLOW, COLOR_DEFAULT,  0), \
906 LINE(DIFF_RENAME_FROM,  "rename from",    COLOR_YELLOW, COLOR_DEFAULT,  0), \
907 LINE(DIFF_RENAME_TO,    "rename to",      COLOR_YELLOW, COLOR_DEFAULT,  0), \
908 LINE(DIFF_SIMILARITY,   "similarity ",    COLOR_YELLOW, COLOR_DEFAULT,  0), \
909 LINE(DIFF_DISSIMILARITY,"dissimilarity ", COLOR_YELLOW, COLOR_DEFAULT,  0), \
910 LINE(DIFF_TREE,         "diff-tree ",     COLOR_BLUE,   COLOR_DEFAULT,  0), \
911 LINE(PP_AUTHOR,    "Author: ",          COLOR_CYAN,     COLOR_DEFAULT,  0), \
912 LINE(PP_COMMIT,    "Commit: ",          COLOR_MAGENTA,  COLOR_DEFAULT,  0), \
913 LINE(PP_MERGE,     "Merge: ",           COLOR_BLUE,     COLOR_DEFAULT,  0), \
914 LINE(PP_DATE,      "Date:   ",          COLOR_YELLOW,   COLOR_DEFAULT,  0), \
915 LINE(PP_ADATE,     "AuthorDate: ",      COLOR_YELLOW,   COLOR_DEFAULT,  0), \
916 LINE(PP_CDATE,     "CommitDate: ",      COLOR_YELLOW,   COLOR_DEFAULT,  0), \
917 LINE(PP_REFS,      "Refs: ",            COLOR_RED,      COLOR_DEFAULT,  0), \
918 LINE(COMMIT,       "commit ",           COLOR_GREEN,    COLOR_DEFAULT,  0), \
919 LINE(PARENT,       "parent ",           COLOR_BLUE,     COLOR_DEFAULT,  0), \
920 LINE(TREE,         "tree ",             COLOR_BLUE,     COLOR_DEFAULT,  0), \
921 LINE(AUTHOR,       "author ",           COLOR_CYAN,     COLOR_DEFAULT,  0), \
922 LINE(COMMITTER,    "committer ",        COLOR_MAGENTA,  COLOR_DEFAULT,  0), \
923 LINE(SIGNOFF,      "    Signed-off-by", COLOR_YELLOW,   COLOR_DEFAULT,  0), \
924 LINE(ACKED,        "    Acked-by",      COLOR_YELLOW,   COLOR_DEFAULT,  0), \
925 LINE(DEFAULT,      "",                  COLOR_DEFAULT,  COLOR_DEFAULT,  A_NORMAL), \
926 LINE(CURSOR,       "",                  COLOR_WHITE,    COLOR_GREEN,    A_BOLD), \
927 LINE(STATUS,       "",                  COLOR_GREEN,    COLOR_DEFAULT,  0), \
928 LINE(DELIMITER,    "",                  COLOR_MAGENTA,  COLOR_DEFAULT,  0), \
929 LINE(DATE,         "",                  COLOR_BLUE,     COLOR_DEFAULT,  0), \
930 LINE(LINE_NUMBER,  "",                  COLOR_CYAN,     COLOR_DEFAULT,  0), \
931 LINE(TITLE_BLUR,   "",                  COLOR_WHITE,    COLOR_BLUE,     0), \
932 LINE(TITLE_FOCUS,  "",                  COLOR_WHITE,    COLOR_BLUE,     A_BOLD), \
933 LINE(MAIN_AUTHOR,  "",                  COLOR_GREEN,    COLOR_DEFAULT,  0), \
934 LINE(MAIN_COMMIT,  "",                  COLOR_DEFAULT,  COLOR_DEFAULT,  0), \
935 LINE(MAIN_TAG,     "",                  COLOR_MAGENTA,  COLOR_DEFAULT,  A_BOLD), \
936 LINE(MAIN_LOCAL_TAG,"",                 COLOR_MAGENTA,  COLOR_DEFAULT,  0), \
937 LINE(MAIN_REMOTE,  "",                  COLOR_YELLOW,   COLOR_DEFAULT,  0), \
938 LINE(MAIN_TRACKED, "",                  COLOR_YELLOW,   COLOR_DEFAULT,  A_BOLD), \
939 LINE(MAIN_REF,     "",                  COLOR_CYAN,     COLOR_DEFAULT,  0), \
940 LINE(MAIN_HEAD,    "",                  COLOR_CYAN,     COLOR_DEFAULT,  A_BOLD), \
941 LINE(MAIN_REVGRAPH,"",                  COLOR_MAGENTA,  COLOR_DEFAULT,  0), \
942 LINE(TREE_DIR,     "",                  COLOR_DEFAULT,  COLOR_DEFAULT,  A_NORMAL), \
943 LINE(TREE_FILE,    "",                  COLOR_DEFAULT,  COLOR_DEFAULT,  A_NORMAL), \
944 LINE(STAT_HEAD,    "",                  COLOR_YELLOW,   COLOR_DEFAULT,  0), \
945 LINE(STAT_SECTION, "",                  COLOR_CYAN,     COLOR_DEFAULT,  0), \
946 LINE(STAT_NONE,    "",                  COLOR_DEFAULT,  COLOR_DEFAULT,  0), \
947 LINE(STAT_STAGED,  "",                  COLOR_MAGENTA,  COLOR_DEFAULT,  0), \
948 LINE(STAT_UNSTAGED,"",                  COLOR_MAGENTA,  COLOR_DEFAULT,  0), \
949 LINE(STAT_UNTRACKED,"",                 COLOR_MAGENTA,  COLOR_DEFAULT,  0), \
950 LINE(BLAME_ID,     "",                  COLOR_MAGENTA,  COLOR_DEFAULT,  0)
951
952 enum line_type {
953 #define LINE(type, line, fg, bg, attr) \
954         LINE_##type
955         LINE_INFO,
956         LINE_NONE
957 #undef  LINE
958 };
959
960 struct line_info {
961         const char *name;       /* Option name. */
962         int namelen;            /* Size of option name. */
963         const char *line;       /* The start of line to match. */
964         int linelen;            /* Size of string to match. */
965         int fg, bg, attr;       /* Color and text attributes for the lines. */
966 };
967
968 static struct line_info line_info[] = {
969 #define LINE(type, line, fg, bg, attr) \
970         { #type, STRING_SIZE(#type), (line), STRING_SIZE(line), (fg), (bg), (attr) }
971         LINE_INFO
972 #undef  LINE
973 };
974
975 static enum line_type
976 get_line_type(const char *line)
977 {
978         int linelen = strlen(line);
979         enum line_type type;
980
981         for (type = 0; type < ARRAY_SIZE(line_info); type++)
982                 /* Case insensitive search matches Signed-off-by lines better. */
983                 if (linelen >= line_info[type].linelen &&
984                     !strncasecmp(line_info[type].line, line, line_info[type].linelen))
985                         return type;
986
987         return LINE_DEFAULT;
988 }
989
990 static inline int
991 get_line_attr(enum line_type type)
992 {
993         assert(type < ARRAY_SIZE(line_info));
994         return COLOR_PAIR(type) | line_info[type].attr;
995 }
996
997 static struct line_info *
998 get_line_info(const char *name)
999 {
1000         size_t namelen = strlen(name);
1001         enum line_type type;
1002
1003         for (type = 0; type < ARRAY_SIZE(line_info); type++)
1004                 if (namelen == line_info[type].namelen &&
1005                     !string_enum_compare(line_info[type].name, name, namelen))
1006                         return &line_info[type];
1007
1008         return NULL;
1009 }
1010
1011 static void
1012 init_colors(void)
1013 {
1014         int default_bg = line_info[LINE_DEFAULT].bg;
1015         int default_fg = line_info[LINE_DEFAULT].fg;
1016         enum line_type type;
1017
1018         start_color();
1019
1020         if (assume_default_colors(default_fg, default_bg) == ERR) {
1021                 default_bg = COLOR_BLACK;
1022                 default_fg = COLOR_WHITE;
1023         }
1024
1025         for (type = 0; type < ARRAY_SIZE(line_info); type++) {
1026                 struct line_info *info = &line_info[type];
1027                 int bg = info->bg == COLOR_DEFAULT ? default_bg : info->bg;
1028                 int fg = info->fg == COLOR_DEFAULT ? default_fg : info->fg;
1029
1030                 init_pair(type, fg, bg);
1031         }
1032 }
1033
1034 struct line {
1035         enum line_type type;
1036
1037         /* State flags */
1038         unsigned int selected:1;
1039         unsigned int dirty:1;
1040         unsigned int cleareol:1;
1041
1042         void *data;             /* User data */
1043 };
1044
1045
1046 /*
1047  * Keys
1048  */
1049
1050 struct keybinding {
1051         int alias;
1052         enum request request;
1053 };
1054
1055 static struct keybinding default_keybindings[] = {
1056         /* View switching */
1057         { 'm',          REQ_VIEW_MAIN },
1058         { 'd',          REQ_VIEW_DIFF },
1059         { 'l',          REQ_VIEW_LOG },
1060         { 't',          REQ_VIEW_TREE },
1061         { 'f',          REQ_VIEW_BLOB },
1062         { 'B',          REQ_VIEW_BLAME },
1063         { 'p',          REQ_VIEW_PAGER },
1064         { 'h',          REQ_VIEW_HELP },
1065         { 'S',          REQ_VIEW_STATUS },
1066         { 'c',          REQ_VIEW_STAGE },
1067
1068         /* View manipulation */
1069         { 'q',          REQ_VIEW_CLOSE },
1070         { KEY_TAB,      REQ_VIEW_NEXT },
1071         { KEY_RETURN,   REQ_ENTER },
1072         { KEY_UP,       REQ_PREVIOUS },
1073         { KEY_DOWN,     REQ_NEXT },
1074         { 'R',          REQ_REFRESH },
1075         { KEY_F(5),     REQ_REFRESH },
1076         { 'O',          REQ_MAXIMIZE },
1077
1078         /* Cursor navigation */
1079         { 'k',          REQ_MOVE_UP },
1080         { 'j',          REQ_MOVE_DOWN },
1081         { KEY_HOME,     REQ_MOVE_FIRST_LINE },
1082         { KEY_END,      REQ_MOVE_LAST_LINE },
1083         { KEY_NPAGE,    REQ_MOVE_PAGE_DOWN },
1084         { ' ',          REQ_MOVE_PAGE_DOWN },
1085         { KEY_PPAGE,    REQ_MOVE_PAGE_UP },
1086         { 'b',          REQ_MOVE_PAGE_UP },
1087         { '-',          REQ_MOVE_PAGE_UP },
1088
1089         /* Scrolling */
1090         { KEY_IC,       REQ_SCROLL_LINE_UP },
1091         { KEY_DC,       REQ_SCROLL_LINE_DOWN },
1092         { 'w',          REQ_SCROLL_PAGE_UP },
1093         { 's',          REQ_SCROLL_PAGE_DOWN },
1094
1095         /* Searching */
1096         { '/',          REQ_SEARCH },
1097         { '?',          REQ_SEARCH_BACK },
1098         { 'n',          REQ_FIND_NEXT },
1099         { 'N',          REQ_FIND_PREV },
1100
1101         /* Misc */
1102         { 'Q',          REQ_QUIT },
1103         { 'z',          REQ_STOP_LOADING },
1104         { 'v',          REQ_SHOW_VERSION },
1105         { 'r',          REQ_SCREEN_REDRAW },
1106         { '.',          REQ_TOGGLE_LINENO },
1107         { 'D',          REQ_TOGGLE_DATE },
1108         { 'A',          REQ_TOGGLE_AUTHOR },
1109         { 'g',          REQ_TOGGLE_REV_GRAPH },
1110         { 'F',          REQ_TOGGLE_REFS },
1111         { ':',          REQ_PROMPT },
1112         { 'u',          REQ_STATUS_UPDATE },
1113         { '!',          REQ_STATUS_REVERT },
1114         { 'M',          REQ_STATUS_MERGE },
1115         { '@',          REQ_STAGE_NEXT },
1116         { ',',          REQ_TREE_PARENT },
1117         { 'e',          REQ_EDIT },
1118 };
1119
1120 #define KEYMAP_INFO \
1121         KEYMAP_(GENERIC), \
1122         KEYMAP_(MAIN), \
1123         KEYMAP_(DIFF), \
1124         KEYMAP_(LOG), \
1125         KEYMAP_(TREE), \
1126         KEYMAP_(BLOB), \
1127         KEYMAP_(BLAME), \
1128         KEYMAP_(PAGER), \
1129         KEYMAP_(HELP), \
1130         KEYMAP_(STATUS), \
1131         KEYMAP_(STAGE)
1132
1133 enum keymap {
1134 #define KEYMAP_(name) KEYMAP_##name
1135         KEYMAP_INFO
1136 #undef  KEYMAP_
1137 };
1138
1139 static struct int_map keymap_table[] = {
1140 #define KEYMAP_(name) { #name, STRING_SIZE(#name), KEYMAP_##name }
1141         KEYMAP_INFO
1142 #undef  KEYMAP_
1143 };
1144
1145 #define set_keymap(map, name) \
1146         set_from_int_map(keymap_table, ARRAY_SIZE(keymap_table), map, name, strlen(name))
1147
1148 struct keybinding_table {
1149         struct keybinding *data;
1150         size_t size;
1151 };
1152
1153 static struct keybinding_table keybindings[ARRAY_SIZE(keymap_table)];
1154
1155 static void
1156 add_keybinding(enum keymap keymap, enum request request, int key)
1157 {
1158         struct keybinding_table *table = &keybindings[keymap];
1159
1160         table->data = realloc(table->data, (table->size + 1) * sizeof(*table->data));
1161         if (!table->data)
1162                 die("Failed to allocate keybinding");
1163         table->data[table->size].alias = key;
1164         table->data[table->size++].request = request;
1165 }
1166
1167 /* Looks for a key binding first in the given map, then in the generic map, and
1168  * lastly in the default keybindings. */
1169 static enum request
1170 get_keybinding(enum keymap keymap, int key)
1171 {
1172         size_t i;
1173
1174         for (i = 0; i < keybindings[keymap].size; i++)
1175                 if (keybindings[keymap].data[i].alias == key)
1176                         return keybindings[keymap].data[i].request;
1177
1178         for (i = 0; i < keybindings[KEYMAP_GENERIC].size; i++)
1179                 if (keybindings[KEYMAP_GENERIC].data[i].alias == key)
1180                         return keybindings[KEYMAP_GENERIC].data[i].request;
1181
1182         for (i = 0; i < ARRAY_SIZE(default_keybindings); i++)
1183                 if (default_keybindings[i].alias == key)
1184                         return default_keybindings[i].request;
1185
1186         return (enum request) key;
1187 }
1188
1189
1190 struct key {
1191         const char *name;
1192         int value;
1193 };
1194
1195 static struct key key_table[] = {
1196         { "Enter",      KEY_RETURN },
1197         { "Space",      ' ' },
1198         { "Backspace",  KEY_BACKSPACE },
1199         { "Tab",        KEY_TAB },
1200         { "Escape",     KEY_ESC },
1201         { "Left",       KEY_LEFT },
1202         { "Right",      KEY_RIGHT },
1203         { "Up",         KEY_UP },
1204         { "Down",       KEY_DOWN },
1205         { "Insert",     KEY_IC },
1206         { "Delete",     KEY_DC },
1207         { "Hash",       '#' },
1208         { "Home",       KEY_HOME },
1209         { "End",        KEY_END },
1210         { "PageUp",     KEY_PPAGE },
1211         { "PageDown",   KEY_NPAGE },
1212         { "F1",         KEY_F(1) },
1213         { "F2",         KEY_F(2) },
1214         { "F3",         KEY_F(3) },
1215         { "F4",         KEY_F(4) },
1216         { "F5",         KEY_F(5) },
1217         { "F6",         KEY_F(6) },
1218         { "F7",         KEY_F(7) },
1219         { "F8",         KEY_F(8) },
1220         { "F9",         KEY_F(9) },
1221         { "F10",        KEY_F(10) },
1222         { "F11",        KEY_F(11) },
1223         { "F12",        KEY_F(12) },
1224 };
1225
1226 static int
1227 get_key_value(const char *name)
1228 {
1229         int i;
1230
1231         for (i = 0; i < ARRAY_SIZE(key_table); i++)
1232                 if (!strcasecmp(key_table[i].name, name))
1233                         return key_table[i].value;
1234
1235         if (strlen(name) == 1 && isprint(*name))
1236                 return (int) *name;
1237
1238         return ERR;
1239 }
1240
1241 static const char *
1242 get_key_name(int key_value)
1243 {
1244         static char key_char[] = "'X'";
1245         const char *seq = NULL;
1246         int key;
1247
1248         for (key = 0; key < ARRAY_SIZE(key_table); key++)
1249                 if (key_table[key].value == key_value)
1250                         seq = key_table[key].name;
1251
1252         if (seq == NULL &&
1253             key_value < 127 &&
1254             isprint(key_value)) {
1255                 key_char[1] = (char) key_value;
1256                 seq = key_char;
1257         }
1258
1259         return seq ? seq : "(no key)";
1260 }
1261
1262 static const char *
1263 get_key(enum request request)
1264 {
1265         static char buf[BUFSIZ];
1266         size_t pos = 0;
1267         char *sep = "";
1268         int i;
1269
1270         buf[pos] = 0;
1271
1272         for (i = 0; i < ARRAY_SIZE(default_keybindings); i++) {
1273                 struct keybinding *keybinding = &default_keybindings[i];
1274
1275                 if (keybinding->request != request)
1276                         continue;
1277
1278                 if (!string_format_from(buf, &pos, "%s%s", sep,
1279                                         get_key_name(keybinding->alias)))
1280                         return "Too many keybindings!";
1281                 sep = ", ";
1282         }
1283
1284         return buf;
1285 }
1286
1287 struct run_request {
1288         enum keymap keymap;
1289         int key;
1290         const char *argv[SIZEOF_ARG];
1291 };
1292
1293 static struct run_request *run_request;
1294 static size_t run_requests;
1295
1296 static enum request
1297 add_run_request(enum keymap keymap, int key, int argc, const char **argv)
1298 {
1299         struct run_request *req;
1300
1301         if (argc >= ARRAY_SIZE(req->argv) - 1)
1302                 return REQ_NONE;
1303
1304         req = realloc(run_request, (run_requests + 1) * sizeof(*run_request));
1305         if (!req)
1306                 return REQ_NONE;
1307
1308         run_request = req;
1309         req = &run_request[run_requests];
1310         req->keymap = keymap;
1311         req->key = key;
1312         req->argv[0] = NULL;
1313
1314         if (!format_argv(req->argv, argv, FORMAT_NONE))
1315                 return REQ_NONE;
1316
1317         return REQ_NONE + ++run_requests;
1318 }
1319
1320 static struct run_request *
1321 get_run_request(enum request request)
1322 {
1323         if (request <= REQ_NONE)
1324                 return NULL;
1325         return &run_request[request - REQ_NONE - 1];
1326 }
1327
1328 static void
1329 add_builtin_run_requests(void)
1330 {
1331         const char *cherry_pick[] = { "git", "cherry-pick", "%(commit)", NULL };
1332         const char *gc[] = { "git", "gc", NULL };
1333         struct {
1334                 enum keymap keymap;
1335                 int key;
1336                 int argc;
1337                 const char **argv;
1338         } reqs[] = {
1339                 { KEYMAP_MAIN,    'C', ARRAY_SIZE(cherry_pick) - 1, cherry_pick },
1340                 { KEYMAP_GENERIC, 'G', ARRAY_SIZE(gc) - 1, gc },
1341         };
1342         int i;
1343
1344         for (i = 0; i < ARRAY_SIZE(reqs); i++) {
1345                 enum request req;
1346
1347                 req = add_run_request(reqs[i].keymap, reqs[i].key, reqs[i].argc, reqs[i].argv);
1348                 if (req != REQ_NONE)
1349                         add_keybinding(reqs[i].keymap, req, reqs[i].key);
1350         }
1351 }
1352
1353 /*
1354  * User config file handling.
1355  */
1356
1357 static struct int_map color_map[] = {
1358 #define COLOR_MAP(name) { #name, STRING_SIZE(#name), COLOR_##name }
1359         COLOR_MAP(DEFAULT),
1360         COLOR_MAP(BLACK),
1361         COLOR_MAP(BLUE),
1362         COLOR_MAP(CYAN),
1363         COLOR_MAP(GREEN),
1364         COLOR_MAP(MAGENTA),
1365         COLOR_MAP(RED),
1366         COLOR_MAP(WHITE),
1367         COLOR_MAP(YELLOW),
1368 };
1369
1370 #define set_color(color, name) \
1371         set_from_int_map(color_map, ARRAY_SIZE(color_map), color, name, strlen(name))
1372
1373 static struct int_map attr_map[] = {
1374 #define ATTR_MAP(name) { #name, STRING_SIZE(#name), A_##name }
1375         ATTR_MAP(NORMAL),
1376         ATTR_MAP(BLINK),
1377         ATTR_MAP(BOLD),
1378         ATTR_MAP(DIM),
1379         ATTR_MAP(REVERSE),
1380         ATTR_MAP(STANDOUT),
1381         ATTR_MAP(UNDERLINE),
1382 };
1383
1384 #define set_attribute(attr, name) \
1385         set_from_int_map(attr_map, ARRAY_SIZE(attr_map), attr, name, strlen(name))
1386
1387 static int   config_lineno;
1388 static bool  config_errors;
1389 static const char *config_msg;
1390
1391 /* Wants: object fgcolor bgcolor [attr] */
1392 static int
1393 option_color_command(int argc, const char *argv[])
1394 {
1395         struct line_info *info;
1396
1397         if (argc != 3 && argc != 4) {
1398                 config_msg = "Wrong number of arguments given to color command";
1399                 return ERR;
1400         }
1401
1402         info = get_line_info(argv[0]);
1403         if (!info) {
1404                 if (!string_enum_compare(argv[0], "main-delim", strlen("main-delim"))) {
1405                         info = get_line_info("delimiter");
1406
1407                 } else if (!string_enum_compare(argv[0], "main-date", strlen("main-date"))) {
1408                         info = get_line_info("date");
1409
1410                 } else {
1411                         config_msg = "Unknown color name";
1412                         return ERR;
1413                 }
1414         }
1415
1416         if (set_color(&info->fg, argv[1]) == ERR ||
1417             set_color(&info->bg, argv[2]) == ERR) {
1418                 config_msg = "Unknown color";
1419                 return ERR;
1420         }
1421
1422         if (argc == 4 && set_attribute(&info->attr, argv[3]) == ERR) {
1423                 config_msg = "Unknown attribute";
1424                 return ERR;
1425         }
1426
1427         return OK;
1428 }
1429
1430 static bool parse_bool(const char *s)
1431 {
1432         return (!strcmp(s, "1") || !strcmp(s, "true") ||
1433                 !strcmp(s, "yes")) ? TRUE : FALSE;
1434 }
1435
1436 static int
1437 parse_int(const char *s, int default_value, int min, int max)
1438 {
1439         int value = atoi(s);
1440
1441         return (value < min || value > max) ? default_value : value;
1442 }
1443
1444 /* Wants: name = value */
1445 static int
1446 option_set_command(int argc, const char *argv[])
1447 {
1448         if (argc != 3) {
1449                 config_msg = "Wrong number of arguments given to set command";
1450                 return ERR;
1451         }
1452
1453         if (strcmp(argv[1], "=")) {
1454                 config_msg = "No value assigned";
1455                 return ERR;
1456         }
1457
1458         if (!strcmp(argv[0], "show-author")) {
1459                 opt_author = parse_bool(argv[2]);
1460                 return OK;
1461         }
1462
1463         if (!strcmp(argv[0], "show-date")) {
1464                 opt_date = parse_bool(argv[2]);
1465                 return OK;
1466         }
1467
1468         if (!strcmp(argv[0], "show-rev-graph")) {
1469                 opt_rev_graph = parse_bool(argv[2]);
1470                 return OK;
1471         }
1472
1473         if (!strcmp(argv[0], "show-refs")) {
1474                 opt_show_refs = parse_bool(argv[2]);
1475                 return OK;
1476         }
1477
1478         if (!strcmp(argv[0], "show-line-numbers")) {
1479                 opt_line_number = parse_bool(argv[2]);
1480                 return OK;
1481         }
1482
1483         if (!strcmp(argv[0], "line-graphics")) {
1484                 opt_line_graphics = parse_bool(argv[2]);
1485                 return OK;
1486         }
1487
1488         if (!strcmp(argv[0], "line-number-interval")) {
1489                 opt_num_interval = parse_int(argv[2], opt_num_interval, 1, 1024);
1490                 return OK;
1491         }
1492
1493         if (!strcmp(argv[0], "author-width")) {
1494                 opt_author_cols = parse_int(argv[2], opt_author_cols, 0, 1024);
1495                 return OK;
1496         }
1497
1498         if (!strcmp(argv[0], "tab-size")) {
1499                 opt_tab_size = parse_int(argv[2], opt_tab_size, 1, 1024);
1500                 return OK;
1501         }
1502
1503         if (!strcmp(argv[0], "commit-encoding")) {
1504                 const char *arg = argv[2];
1505                 int arglen = strlen(arg);
1506
1507                 switch (arg[0]) {
1508                 case '"':
1509                 case '\'':
1510                         if (arglen == 1 || arg[arglen - 1] != arg[0]) {
1511                                 config_msg = "Unmatched quotation";
1512                                 return ERR;
1513                         }
1514                         arg += 1; arglen -= 2;
1515                 default:
1516                         string_ncopy(opt_encoding, arg, strlen(arg));
1517                         return OK;
1518                 }
1519         }
1520
1521         config_msg = "Unknown variable name";
1522         return ERR;
1523 }
1524
1525 /* Wants: mode request key */
1526 static int
1527 option_bind_command(int argc, const char *argv[])
1528 {
1529         enum request request;
1530         int keymap;
1531         int key;
1532
1533         if (argc < 3) {
1534                 config_msg = "Wrong number of arguments given to bind command";
1535                 return ERR;
1536         }
1537
1538         if (set_keymap(&keymap, argv[0]) == ERR) {
1539                 config_msg = "Unknown key map";
1540                 return ERR;
1541         }
1542
1543         key = get_key_value(argv[1]);
1544         if (key == ERR) {
1545                 config_msg = "Unknown key";
1546                 return ERR;
1547         }
1548
1549         request = get_request(argv[2]);
1550         if (request == REQ_NONE) {
1551                 const char *obsolete[] = { "cherry-pick", "screen-resize" };
1552                 size_t namelen = strlen(argv[2]);
1553                 int i;
1554
1555                 for (i = 0; i < ARRAY_SIZE(obsolete); i++) {
1556                         if (namelen == strlen(obsolete[i]) &&
1557                             !string_enum_compare(obsolete[i], argv[2], namelen)) {
1558                                 config_msg = "Obsolete request name";
1559                                 return ERR;
1560                         }
1561                 }
1562         }
1563         if (request == REQ_NONE && *argv[2]++ == '!')
1564                 request = add_run_request(keymap, key, argc - 2, argv + 2);
1565         if (request == REQ_NONE) {
1566                 config_msg = "Unknown request name";
1567                 return ERR;
1568         }
1569
1570         add_keybinding(keymap, request, key);
1571
1572         return OK;
1573 }
1574
1575 static int
1576 set_option(const char *opt, char *value)
1577 {
1578         const char *argv[SIZEOF_ARG];
1579         int argc = 0;
1580
1581         if (!argv_from_string(argv, &argc, value)) {
1582                 config_msg = "Too many option arguments";
1583                 return ERR;
1584         }
1585
1586         if (!strcmp(opt, "color"))
1587                 return option_color_command(argc, argv);
1588
1589         if (!strcmp(opt, "set"))
1590                 return option_set_command(argc, argv);
1591
1592         if (!strcmp(opt, "bind"))
1593                 return option_bind_command(argc, argv);
1594
1595         config_msg = "Unknown option command";
1596         return ERR;
1597 }
1598
1599 static int
1600 read_option(char *opt, size_t optlen, char *value, size_t valuelen)
1601 {
1602         int status = OK;
1603
1604         config_lineno++;
1605         config_msg = "Internal error";
1606
1607         /* Check for comment markers, since read_properties() will
1608          * only ensure opt and value are split at first " \t". */
1609         optlen = strcspn(opt, "#");
1610         if (optlen == 0)
1611                 return OK;
1612
1613         if (opt[optlen] != 0) {
1614                 config_msg = "No option value";
1615                 status = ERR;
1616
1617         }  else {
1618                 /* Look for comment endings in the value. */
1619                 size_t len = strcspn(value, "#");
1620
1621                 if (len < valuelen) {
1622                         valuelen = len;
1623                         value[valuelen] = 0;
1624                 }
1625
1626                 status = set_option(opt, value);
1627         }
1628
1629         if (status == ERR) {
1630                 fprintf(stderr, "Error on line %d, near '%.*s': %s\n",
1631                         config_lineno, (int) optlen, opt, config_msg);
1632                 config_errors = TRUE;
1633         }
1634
1635         /* Always keep going if errors are encountered. */
1636         return OK;
1637 }
1638
1639 static void
1640 load_option_file(const char *path)
1641 {
1642         struct io io = {};
1643
1644         /* It's ok that the file doesn't exist. */
1645         if (!io_open(&io, path))
1646                 return;
1647
1648         config_lineno = 0;
1649         config_errors = FALSE;
1650
1651         if (read_properties(&io, " \t", read_option) == ERR ||
1652             config_errors == TRUE)
1653                 fprintf(stderr, "Errors while loading %s.\n", path);
1654 }
1655
1656 static int
1657 load_options(void)
1658 {
1659         const char *home = getenv("HOME");
1660         const char *tigrc_user = getenv("TIGRC_USER");
1661         const char *tigrc_system = getenv("TIGRC_SYSTEM");
1662         char buf[SIZEOF_STR];
1663
1664         add_builtin_run_requests();
1665
1666         if (!tigrc_system) {
1667                 if (!string_format(buf, "%s/tigrc", SYSCONFDIR))
1668                         return ERR;
1669                 tigrc_system = buf;
1670         }
1671         load_option_file(tigrc_system);
1672
1673         if (!tigrc_user) {
1674                 if (!home || !string_format(buf, "%s/.tigrc", home))
1675                         return ERR;
1676                 tigrc_user = buf;
1677         }
1678         load_option_file(tigrc_user);
1679
1680         return OK;
1681 }
1682
1683
1684 /*
1685  * The viewer
1686  */
1687
1688 struct view;
1689 struct view_ops;
1690
1691 /* The display array of active views and the index of the current view. */
1692 static struct view *display[2];
1693 static unsigned int current_view;
1694
1695 /* Reading from the prompt? */
1696 static bool input_mode = FALSE;
1697
1698 #define foreach_displayed_view(view, i) \
1699         for (i = 0; i < ARRAY_SIZE(display) && (view = display[i]); i++)
1700
1701 #define displayed_views()       (display[1] != NULL ? 2 : 1)
1702
1703 /* Current head and commit ID */
1704 static char ref_blob[SIZEOF_REF]        = "";
1705 static char ref_commit[SIZEOF_REF]      = "HEAD";
1706 static char ref_head[SIZEOF_REF]        = "HEAD";
1707
1708 struct view {
1709         const char *name;       /* View name */
1710         const char *cmd_env;    /* Command line set via environment */
1711         const char *id;         /* Points to either of ref_{head,commit,blob} */
1712
1713         struct view_ops *ops;   /* View operations */
1714
1715         enum keymap keymap;     /* What keymap does this view have */
1716         bool git_dir;           /* Whether the view requires a git directory. */
1717
1718         char ref[SIZEOF_REF];   /* Hovered commit reference */
1719         char vid[SIZEOF_REF];   /* View ID. Set to id member when updating. */
1720
1721         int height, width;      /* The width and height of the main window */
1722         WINDOW *win;            /* The main window */
1723         WINDOW *title;          /* The title window living below the main window */
1724
1725         /* Navigation */
1726         unsigned long offset;   /* Offset of the window top */
1727         unsigned long lineno;   /* Current line number */
1728         unsigned long p_offset; /* Previous offset of the window top */
1729         unsigned long p_lineno; /* Previous current line number */
1730         bool p_restore;         /* Should the previous position be restored. */
1731
1732         /* Searching */
1733         char grep[SIZEOF_STR];  /* Search string */
1734         regex_t *regex;         /* Pre-compiled regex */
1735
1736         /* If non-NULL, points to the view that opened this view. If this view
1737          * is closed tig will switch back to the parent view. */
1738         struct view *parent;
1739
1740         /* Buffering */
1741         size_t lines;           /* Total number of lines */
1742         struct line *line;      /* Line index */
1743         size_t line_alloc;      /* Total number of allocated lines */
1744         unsigned int digits;    /* Number of digits in the lines member. */
1745
1746         /* Drawing */
1747         struct line *curline;   /* Line currently being drawn. */
1748         enum line_type curtype; /* Attribute currently used for drawing. */
1749         unsigned long col;      /* Column when drawing. */
1750
1751         /* Loading */
1752         struct io io;
1753         struct io *pipe;
1754         time_t start_time;
1755         time_t update_secs;
1756 };
1757
1758 struct view_ops {
1759         /* What type of content being displayed. Used in the title bar. */
1760         const char *type;
1761         /* Default command arguments. */
1762         const char **argv;
1763         /* Open and reads in all view content. */
1764         bool (*open)(struct view *view);
1765         /* Read one line; updates view->line. */
1766         bool (*read)(struct view *view, char *data);
1767         /* Draw one line; @lineno must be < view->height. */
1768         bool (*draw)(struct view *view, struct line *line, unsigned int lineno);
1769         /* Depending on view handle a special requests. */
1770         enum request (*request)(struct view *view, enum request request, struct line *line);
1771         /* Search for regex in a line. */
1772         bool (*grep)(struct view *view, struct line *line);
1773         /* Select line */
1774         void (*select)(struct view *view, struct line *line);
1775 };
1776
1777 static struct view_ops blame_ops;
1778 static struct view_ops blob_ops;
1779 static struct view_ops diff_ops;
1780 static struct view_ops help_ops;
1781 static struct view_ops log_ops;
1782 static struct view_ops main_ops;
1783 static struct view_ops pager_ops;
1784 static struct view_ops stage_ops;
1785 static struct view_ops status_ops;
1786 static struct view_ops tree_ops;
1787
1788 #define VIEW_STR(name, env, ref, ops, map, git) \
1789         { name, #env, ref, ops, map, git }
1790
1791 #define VIEW_(id, name, ops, git, ref) \
1792         VIEW_STR(name, TIG_##id##_CMD, ref, ops, KEYMAP_##id, git)
1793
1794
1795 static struct view views[] = {
1796         VIEW_(MAIN,   "main",   &main_ops,   TRUE,  ref_head),
1797         VIEW_(DIFF,   "diff",   &diff_ops,   TRUE,  ref_commit),
1798         VIEW_(LOG,    "log",    &log_ops,    TRUE,  ref_head),
1799         VIEW_(TREE,   "tree",   &tree_ops,   TRUE,  ref_commit),
1800         VIEW_(BLOB,   "blob",   &blob_ops,   TRUE,  ref_blob),
1801         VIEW_(BLAME,  "blame",  &blame_ops,  TRUE,  ref_commit),
1802         VIEW_(HELP,   "help",   &help_ops,   FALSE, ""),
1803         VIEW_(PAGER,  "pager",  &pager_ops,  FALSE, "stdin"),
1804         VIEW_(STATUS, "status", &status_ops, TRUE,  ""),
1805         VIEW_(STAGE,  "stage",  &stage_ops,  TRUE,  ""),
1806 };
1807
1808 #define VIEW(req)       (&views[(req) - REQ_OFFSET - 1])
1809 #define VIEW_REQ(view)  ((view) - views + REQ_OFFSET + 1)
1810
1811 #define foreach_view(view, i) \
1812         for (i = 0; i < ARRAY_SIZE(views) && (view = &views[i]); i++)
1813
1814 #define view_is_displayed(view) \
1815         (view == display[0] || view == display[1])
1816
1817
1818 enum line_graphic {
1819         LINE_GRAPHIC_VLINE
1820 };
1821
1822 static int line_graphics[] = {
1823         /* LINE_GRAPHIC_VLINE: */ '|'
1824 };
1825
1826 static inline void
1827 set_view_attr(struct view *view, enum line_type type)
1828 {
1829         if (!view->curline->selected && view->curtype != type) {
1830                 wattrset(view->win, get_line_attr(type));
1831                 wchgat(view->win, -1, 0, type, NULL);
1832                 view->curtype = type;
1833         }
1834 }
1835
1836 static int
1837 draw_chars(struct view *view, enum line_type type, const char *string,
1838            int max_len, bool use_tilde)
1839 {
1840         int len = 0;
1841         int col = 0;
1842         int trimmed = FALSE;
1843
1844         if (max_len <= 0)
1845                 return 0;
1846
1847         if (opt_utf8) {
1848                 len = utf8_length(string, &col, max_len, &trimmed, use_tilde);
1849         } else {
1850                 col = len = strlen(string);
1851                 if (len > max_len) {
1852                         if (use_tilde) {
1853                                 max_len -= 1;
1854                         }
1855                         col = len = max_len;
1856                         trimmed = TRUE;
1857                 }
1858         }
1859
1860         set_view_attr(view, type);
1861         waddnstr(view->win, string, len);
1862         if (trimmed && use_tilde) {
1863                 set_view_attr(view, LINE_DELIMITER);
1864                 waddch(view->win, '~');
1865                 col++;
1866         }
1867
1868         return col;
1869 }
1870
1871 static int
1872 draw_space(struct view *view, enum line_type type, int max, int spaces)
1873 {
1874         static char space[] = "                    ";
1875         int col = 0;
1876
1877         spaces = MIN(max, spaces);
1878
1879         while (spaces > 0) {
1880                 int len = MIN(spaces, sizeof(space) - 1);
1881
1882                 col += draw_chars(view, type, space, spaces, FALSE);
1883                 spaces -= len;
1884         }
1885
1886         return col;
1887 }
1888
1889 static bool
1890 draw_lineno(struct view *view, unsigned int lineno)
1891 {
1892         char number[10];
1893         int digits3 = view->digits < 3 ? 3 : view->digits;
1894         int max_number = MIN(digits3, STRING_SIZE(number));
1895         int max = view->width - view->col;
1896         int col;
1897
1898         if (max < max_number)
1899                 max_number = max;
1900
1901         lineno += view->offset + 1;
1902         if (lineno == 1 || (lineno % opt_num_interval) == 0) {
1903                 static char fmt[] = "%1ld";
1904
1905                 if (view->digits <= 9)
1906                         fmt[1] = '0' + digits3;
1907
1908                 if (!string_format(number, fmt, lineno))
1909                         number[0] = 0;
1910                 col = draw_chars(view, LINE_LINE_NUMBER, number, max_number, TRUE);
1911         } else {
1912                 col = draw_space(view, LINE_LINE_NUMBER, max_number, max_number);
1913         }
1914
1915         if (col < max) {
1916                 set_view_attr(view, LINE_DEFAULT);
1917                 waddch(view->win, line_graphics[LINE_GRAPHIC_VLINE]);
1918                 col++;
1919         }
1920
1921         if (col < max)
1922                 col += draw_space(view, LINE_DEFAULT, max - col, 1);
1923         view->col += col;
1924
1925         return view->width - view->col <= 0;
1926 }
1927
1928 static bool
1929 draw_text(struct view *view, enum line_type type, const char *string, bool trim)
1930 {
1931         view->col += draw_chars(view, type, string, view->width - view->col, trim);
1932         return view->width - view->col <= 0;
1933 }
1934
1935 static bool
1936 draw_graphic(struct view *view, enum line_type type, chtype graphic[], size_t size)
1937 {
1938         int max = view->width - view->col;
1939         int i;
1940
1941         if (max < size)
1942                 size = max;
1943
1944         set_view_attr(view, type);
1945         /* Using waddch() instead of waddnstr() ensures that
1946          * they'll be rendered correctly for the cursor line. */
1947         for (i = 0; i < size; i++)
1948                 waddch(view->win, graphic[i]);
1949
1950         view->col += size;
1951         if (size < max) {
1952                 waddch(view->win, ' ');
1953                 view->col++;
1954         }
1955
1956         return view->width - view->col <= 0;
1957 }
1958
1959 static bool
1960 draw_field(struct view *view, enum line_type type, const char *text, int len, bool trim)
1961 {
1962         int max = MIN(view->width - view->col, len);
1963         int col;
1964
1965         if (text)
1966                 col = draw_chars(view, type, text, max - 1, trim);
1967         else
1968                 col = draw_space(view, type, max - 1, max - 1);
1969
1970         view->col += col + draw_space(view, LINE_DEFAULT, max - col, max - col);
1971         return view->width - view->col <= 0;
1972 }
1973
1974 static bool
1975 draw_date(struct view *view, struct tm *time)
1976 {
1977         char buf[DATE_COLS];
1978         char *date;
1979         int timelen = 0;
1980
1981         if (time)
1982                 timelen = strftime(buf, sizeof(buf), DATE_FORMAT, time);
1983         date = timelen ? buf : NULL;
1984
1985         return draw_field(view, LINE_DATE, date, DATE_COLS, FALSE);
1986 }
1987
1988 static bool
1989 draw_view_line(struct view *view, unsigned int lineno)
1990 {
1991         struct line *line;
1992         bool selected = (view->offset + lineno == view->lineno);
1993         bool draw_ok;
1994
1995         assert(view_is_displayed(view));
1996
1997         if (view->offset + lineno >= view->lines)
1998                 return FALSE;
1999
2000         line = &view->line[view->offset + lineno];
2001
2002         wmove(view->win, lineno, 0);
2003         if (line->cleareol)
2004                 wclrtoeol(view->win);
2005         view->col = 0;
2006         view->curline = line;
2007         view->curtype = LINE_NONE;
2008         line->selected = FALSE;
2009         line->dirty = line->cleareol = 0;
2010
2011         if (selected) {
2012                 set_view_attr(view, LINE_CURSOR);
2013                 line->selected = TRUE;
2014                 view->ops->select(view, line);
2015         }
2016
2017         scrollok(view->win, FALSE);
2018         draw_ok = view->ops->draw(view, line, lineno);
2019         scrollok(view->win, TRUE);
2020
2021         return draw_ok;
2022 }
2023
2024 static void
2025 redraw_view_dirty(struct view *view)
2026 {
2027         bool dirty = FALSE;
2028         int lineno;
2029
2030         for (lineno = 0; lineno < view->height; lineno++) {
2031                 if (view->offset + lineno >= view->lines)
2032                         break;
2033                 if (!view->line[view->offset + lineno].dirty)
2034                         continue;
2035                 dirty = TRUE;
2036                 if (!draw_view_line(view, lineno))
2037                         break;
2038         }
2039
2040         if (!dirty)
2041                 return;
2042         redrawwin(view->win);
2043         if (input_mode)
2044                 wnoutrefresh(view->win);
2045         else
2046                 wrefresh(view->win);
2047 }
2048
2049 static void
2050 redraw_view_from(struct view *view, int lineno)
2051 {
2052         assert(0 <= lineno && lineno < view->height);
2053
2054         for (; lineno < view->height; lineno++) {
2055                 if (!draw_view_line(view, lineno))
2056                         break;
2057         }
2058
2059         redrawwin(view->win);
2060         if (input_mode)
2061                 wnoutrefresh(view->win);
2062         else
2063                 wrefresh(view->win);
2064 }
2065
2066 static void
2067 redraw_view(struct view *view)
2068 {
2069         werase(view->win);
2070         redraw_view_from(view, 0);
2071 }
2072
2073
2074 static void
2075 update_view_title(struct view *view)
2076 {
2077         char buf[SIZEOF_STR];
2078         char state[SIZEOF_STR];
2079         size_t bufpos = 0, statelen = 0;
2080
2081         assert(view_is_displayed(view));
2082
2083         if (view != VIEW(REQ_VIEW_STATUS) && view->lines) {
2084                 unsigned int view_lines = view->offset + view->height;
2085                 unsigned int lines = view->lines
2086                                    ? MIN(view_lines, view->lines) * 100 / view->lines
2087                                    : 0;
2088
2089                 string_format_from(state, &statelen, " - %s %d of %d (%d%%)",
2090                                    view->ops->type,
2091                                    view->lineno + 1,
2092                                    view->lines,
2093                                    lines);
2094
2095         }
2096
2097         if (view->pipe) {
2098                 time_t secs = time(NULL) - view->start_time;
2099
2100                 /* Three git seconds are a long time ... */
2101                 if (secs > 2)
2102                         string_format_from(state, &statelen, " loading %lds", secs);
2103         }
2104
2105         string_format_from(buf, &bufpos, "[%s]", view->name);
2106         if (*view->ref && bufpos < view->width) {
2107                 size_t refsize = strlen(view->ref);
2108                 size_t minsize = bufpos + 1 + /* abbrev= */ 7 + 1 + statelen;
2109
2110                 if (minsize < view->width)
2111                         refsize = view->width - minsize + 7;
2112                 string_format_from(buf, &bufpos, " %.*s", (int) refsize, view->ref);
2113         }
2114
2115         if (statelen && bufpos < view->width) {
2116                 string_format_from(buf, &bufpos, "%s", state);
2117         }
2118
2119         if (view == display[current_view])
2120                 wbkgdset(view->title, get_line_attr(LINE_TITLE_FOCUS));
2121         else
2122                 wbkgdset(view->title, get_line_attr(LINE_TITLE_BLUR));
2123
2124         mvwaddnstr(view->title, 0, 0, buf, bufpos);
2125         wclrtoeol(view->title);
2126         wmove(view->title, 0, view->width - 1);
2127
2128         if (input_mode)
2129                 wnoutrefresh(view->title);
2130         else
2131                 wrefresh(view->title);
2132 }
2133
2134 static void
2135 resize_display(void)
2136 {
2137         int offset, i;
2138         struct view *base = display[0];
2139         struct view *view = display[1] ? display[1] : display[0];
2140
2141         /* Setup window dimensions */
2142
2143         getmaxyx(stdscr, base->height, base->width);
2144
2145         /* Make room for the status window. */
2146         base->height -= 1;
2147
2148         if (view != base) {
2149                 /* Horizontal split. */
2150                 view->width   = base->width;
2151                 view->height  = SCALE_SPLIT_VIEW(base->height);
2152                 base->height -= view->height;
2153
2154                 /* Make room for the title bar. */
2155                 view->height -= 1;
2156         }
2157
2158         /* Make room for the title bar. */
2159         base->height -= 1;
2160
2161         offset = 0;
2162
2163         foreach_displayed_view (view, i) {
2164                 if (!view->win) {
2165                         view->win = newwin(view->height, 0, offset, 0);
2166                         if (!view->win)
2167                                 die("Failed to create %s view", view->name);
2168
2169                         scrollok(view->win, TRUE);
2170
2171                         view->title = newwin(1, 0, offset + view->height, 0);
2172                         if (!view->title)
2173                                 die("Failed to create title window");
2174
2175                 } else {
2176                         wresize(view->win, view->height, view->width);
2177                         mvwin(view->win,   offset, 0);
2178                         mvwin(view->title, offset + view->height, 0);
2179                 }
2180
2181                 offset += view->height + 1;
2182         }
2183 }
2184
2185 static void
2186 redraw_display(bool clear)
2187 {
2188         struct view *view;
2189         int i;
2190
2191         foreach_displayed_view (view, i) {
2192                 if (clear)
2193                         wclear(view->win);
2194                 redraw_view(view);
2195                 update_view_title(view);
2196         }
2197 }
2198
2199 static void
2200 update_display_cursor(struct view *view)
2201 {
2202         /* Move the cursor to the right-most column of the cursor line.
2203          *
2204          * XXX: This could turn out to be a bit expensive, but it ensures that
2205          * the cursor does not jump around. */
2206         if (view->lines) {
2207                 wmove(view->win, view->lineno - view->offset, view->width - 1);
2208                 wrefresh(view->win);
2209         }
2210 }
2211
2212 static void
2213 toggle_view_option(bool *option, const char *help)
2214 {
2215         *option = !*option;
2216         redraw_display(FALSE);
2217         report("%sabling %s", *option ? "En" : "Dis", help);
2218 }
2219
2220 /*
2221  * Navigation
2222  */
2223
2224 /* Scrolling backend */
2225 static void
2226 do_scroll_view(struct view *view, int lines)
2227 {
2228         bool redraw_current_line = FALSE;
2229
2230         /* The rendering expects the new offset. */
2231         view->offset += lines;
2232
2233         assert(0 <= view->offset && view->offset < view->lines);
2234         assert(lines);
2235
2236         /* Move current line into the view. */
2237         if (view->lineno < view->offset) {
2238                 view->lineno = view->offset;
2239                 redraw_current_line = TRUE;
2240         } else if (view->lineno >= view->offset + view->height) {
2241                 view->lineno = view->offset + view->height - 1;
2242                 redraw_current_line = TRUE;
2243         }
2244
2245         assert(view->offset <= view->lineno && view->lineno < view->lines);
2246
2247         /* Redraw the whole screen if scrolling is pointless. */
2248         if (view->height < ABS(lines)) {
2249                 redraw_view(view);
2250
2251         } else {
2252                 int line = lines > 0 ? view->height - lines : 0;
2253                 int end = line + ABS(lines);
2254
2255                 wscrl(view->win, lines);
2256
2257                 for (; line < end; line++) {
2258                         if (!draw_view_line(view, line))
2259                                 break;
2260                 }
2261
2262                 if (redraw_current_line)
2263                         draw_view_line(view, view->lineno - view->offset);
2264         }
2265
2266         redrawwin(view->win);
2267         wrefresh(view->win);
2268         report("");
2269 }
2270
2271 /* Scroll frontend */
2272 static void
2273 scroll_view(struct view *view, enum request request)
2274 {
2275         int lines = 1;
2276
2277         assert(view_is_displayed(view));
2278
2279         switch (request) {
2280         case REQ_SCROLL_PAGE_DOWN:
2281                 lines = view->height;
2282         case REQ_SCROLL_LINE_DOWN:
2283                 if (view->offset + lines > view->lines)
2284                         lines = view->lines - view->offset;
2285
2286                 if (lines == 0 || view->offset + view->height >= view->lines) {
2287                         report("Cannot scroll beyond the last line");
2288                         return;
2289                 }
2290                 break;
2291
2292         case REQ_SCROLL_PAGE_UP:
2293                 lines = view->height;
2294         case REQ_SCROLL_LINE_UP:
2295                 if (lines > view->offset)
2296                         lines = view->offset;
2297
2298                 if (lines == 0) {
2299                         report("Cannot scroll beyond the first line");
2300                         return;
2301                 }
2302
2303                 lines = -lines;
2304                 break;
2305
2306         default:
2307                 die("request %d not handled in switch", request);
2308         }
2309
2310         do_scroll_view(view, lines);
2311 }
2312
2313 /* Cursor moving */
2314 static void
2315 move_view(struct view *view, enum request request)
2316 {
2317         int scroll_steps = 0;
2318         int steps;
2319
2320         switch (request) {
2321         case REQ_MOVE_FIRST_LINE:
2322                 steps = -view->lineno;
2323                 break;
2324
2325         case REQ_MOVE_LAST_LINE:
2326                 steps = view->lines - view->lineno - 1;
2327                 break;
2328
2329         case REQ_MOVE_PAGE_UP:
2330                 steps = view->height > view->lineno
2331                       ? -view->lineno : -view->height;
2332                 break;
2333
2334         case REQ_MOVE_PAGE_DOWN:
2335                 steps = view->lineno + view->height >= view->lines
2336                       ? view->lines - view->lineno - 1 : view->height;
2337                 break;
2338
2339         case REQ_MOVE_UP:
2340                 steps = -1;
2341                 break;
2342
2343         case REQ_MOVE_DOWN:
2344                 steps = 1;
2345                 break;
2346
2347         default:
2348                 die("request %d not handled in switch", request);
2349         }
2350
2351         if (steps <= 0 && view->lineno == 0) {
2352                 report("Cannot move beyond the first line");
2353                 return;
2354
2355         } else if (steps >= 0 && view->lineno + 1 >= view->lines) {
2356                 report("Cannot move beyond the last line");
2357                 return;
2358         }
2359
2360         /* Move the current line */
2361         view->lineno += steps;
2362         assert(0 <= view->lineno && view->lineno < view->lines);
2363
2364         /* Check whether the view needs to be scrolled */
2365         if (view->lineno < view->offset ||
2366             view->lineno >= view->offset + view->height) {
2367                 scroll_steps = steps;
2368                 if (steps < 0 && -steps > view->offset) {
2369                         scroll_steps = -view->offset;
2370
2371                 } else if (steps > 0) {
2372                         if (view->lineno == view->lines - 1 &&
2373                             view->lines > view->height) {
2374                                 scroll_steps = view->lines - view->offset - 1;
2375                                 if (scroll_steps >= view->height)
2376                                         scroll_steps -= view->height - 1;
2377                         }
2378                 }
2379         }
2380
2381         if (!view_is_displayed(view)) {
2382                 view->offset += scroll_steps;
2383                 assert(0 <= view->offset && view->offset < view->lines);
2384                 view->ops->select(view, &view->line[view->lineno]);
2385                 return;
2386         }
2387
2388         /* Repaint the old "current" line if we be scrolling */
2389         if (ABS(steps) < view->height)
2390                 draw_view_line(view, view->lineno - steps - view->offset);
2391
2392         if (scroll_steps) {
2393                 do_scroll_view(view, scroll_steps);
2394                 return;
2395         }
2396
2397         /* Draw the current line */
2398         draw_view_line(view, view->lineno - view->offset);
2399
2400         redrawwin(view->win);
2401         wrefresh(view->win);
2402         report("");
2403 }
2404
2405
2406 /*
2407  * Searching
2408  */
2409
2410 static void search_view(struct view *view, enum request request);
2411
2412 static void
2413 select_view_line(struct view *view, unsigned long lineno)
2414 {
2415         if (lineno - view->offset >= view->height) {
2416                 view->offset = lineno;
2417                 view->lineno = lineno;
2418                 if (view_is_displayed(view))
2419                         redraw_view(view);
2420
2421         } else {
2422                 unsigned long old_lineno = view->lineno - view->offset;
2423
2424                 view->lineno = lineno;
2425                 if (view_is_displayed(view)) {
2426                         draw_view_line(view, old_lineno);
2427                         draw_view_line(view, view->lineno - view->offset);
2428                         redrawwin(view->win);
2429                         wrefresh(view->win);
2430                 } else {
2431                         view->ops->select(view, &view->line[view->lineno]);
2432                 }
2433         }
2434 }
2435
2436 static void
2437 find_next(struct view *view, enum request request)
2438 {
2439         unsigned long lineno = view->lineno;
2440         int direction;
2441
2442         if (!*view->grep) {
2443                 if (!*opt_search)
2444                         report("No previous search");
2445                 else
2446                         search_view(view, request);
2447                 return;
2448         }
2449
2450         switch (request) {
2451         case REQ_SEARCH:
2452         case REQ_FIND_NEXT:
2453                 direction = 1;
2454                 break;
2455
2456         case REQ_SEARCH_BACK:
2457         case REQ_FIND_PREV:
2458                 direction = -1;
2459                 break;
2460
2461         default:
2462                 return;
2463         }
2464
2465         if (request == REQ_FIND_NEXT || request == REQ_FIND_PREV)
2466                 lineno += direction;
2467
2468         /* Note, lineno is unsigned long so will wrap around in which case it
2469          * will become bigger than view->lines. */
2470         for (; lineno < view->lines; lineno += direction) {
2471                 if (view->ops->grep(view, &view->line[lineno])) {
2472                         select_view_line(view, lineno);
2473                         report("Line %ld matches '%s'", lineno + 1, view->grep);
2474                         return;
2475                 }
2476         }
2477
2478         report("No match found for '%s'", view->grep);
2479 }
2480
2481 static void
2482 search_view(struct view *view, enum request request)
2483 {
2484         int regex_err;
2485
2486         if (view->regex) {
2487                 regfree(view->regex);
2488                 *view->grep = 0;
2489         } else {
2490                 view->regex = calloc(1, sizeof(*view->regex));
2491                 if (!view->regex)
2492                         return;
2493         }
2494
2495         regex_err = regcomp(view->regex, opt_search, REG_EXTENDED);
2496         if (regex_err != 0) {
2497                 char buf[SIZEOF_STR] = "unknown error";
2498
2499                 regerror(regex_err, view->regex, buf, sizeof(buf));
2500                 report("Search failed: %s", buf);
2501                 return;
2502         }
2503
2504         string_copy(view->grep, opt_search);
2505
2506         find_next(view, request);
2507 }
2508
2509 /*
2510  * Incremental updating
2511  */
2512
2513 static void
2514 reset_view(struct view *view)
2515 {
2516         int i;
2517
2518         for (i = 0; i < view->lines; i++)
2519                 free(view->line[i].data);
2520         free(view->line);
2521
2522         view->p_offset = view->offset;
2523         view->p_lineno = view->lineno;
2524
2525         view->line = NULL;
2526         view->offset = 0;
2527         view->lines  = 0;
2528         view->lineno = 0;
2529         view->line_alloc = 0;
2530         view->vid[0] = 0;
2531         view->update_secs = 0;
2532 }
2533
2534 static void
2535 free_argv(const char *argv[])
2536 {
2537         int argc;
2538
2539         for (argc = 0; argv[argc]; argc++)
2540                 free((void *) argv[argc]);
2541 }
2542
2543 static bool
2544 format_argv(const char *dst_argv[], const char *src_argv[], enum format_flags flags)
2545 {
2546         char buf[SIZEOF_STR];
2547         int argc;
2548         bool noreplace = flags == FORMAT_NONE;
2549
2550         free_argv(dst_argv);
2551
2552         for (argc = 0; src_argv[argc]; argc++) {
2553                 const char *arg = src_argv[argc];
2554                 size_t bufpos = 0;
2555
2556                 while (arg) {
2557                         char *next = strstr(arg, "%(");
2558                         int len = next - arg;
2559                         const char *value;
2560
2561                         if (!next || noreplace) {
2562                                 if (flags == FORMAT_DASH && !strcmp(arg, "--"))
2563                                         noreplace = TRUE;
2564                                 len = strlen(arg);
2565                                 value = "";
2566
2567                         } else if (!prefixcmp(next, "%(directory)")) {
2568                                 value = opt_path;
2569
2570                         } else if (!prefixcmp(next, "%(file)")) {
2571                                 value = opt_file;
2572
2573                         } else if (!prefixcmp(next, "%(ref)")) {
2574                                 value = *opt_ref ? opt_ref : "HEAD";
2575
2576                         } else if (!prefixcmp(next, "%(head)")) {
2577                                 value = ref_head;
2578
2579                         } else if (!prefixcmp(next, "%(commit)")) {
2580                                 value = ref_commit;
2581
2582                         } else if (!prefixcmp(next, "%(blob)")) {
2583                                 value = ref_blob;
2584
2585                         } else {
2586                                 report("Unknown replacement: `%s`", next);
2587                                 return FALSE;
2588                         }
2589
2590                         if (!string_format_from(buf, &bufpos, "%.*s%s", len, arg, value))
2591                                 return FALSE;
2592
2593                         arg = next && !noreplace ? strchr(next, ')') + 1 : NULL;
2594                 }
2595
2596                 dst_argv[argc] = strdup(buf);
2597                 if (!dst_argv[argc])
2598                         break;
2599         }
2600
2601         dst_argv[argc] = NULL;
2602
2603         return src_argv[argc] == NULL;
2604 }
2605
2606 static bool
2607 restore_view_position(struct view *view)
2608 {
2609         if (!view->p_restore || (view->pipe && view->lines <= view->p_lineno))
2610                 return FALSE;
2611
2612         /* Changing the view position cancels the restoring. */
2613         /* FIXME: Changing back to the first line is not detected. */
2614         if (view->offset != 0 || view->lineno != 0) {
2615                 view->p_restore = FALSE;
2616                 return FALSE;
2617         }
2618
2619         if (view->p_lineno >= view->lines) {
2620                 view->p_lineno = view->lines > 0 ? view->lines - 1 : 0;
2621                 if (view->p_offset >= view->p_lineno) {
2622                         unsigned long half = view->height / 2;
2623
2624                         if (view->p_lineno > half)
2625                                 view->p_offset = view->p_lineno - half;
2626                         else
2627                                 view->p_offset = 0;
2628                 }
2629         }
2630
2631         if (view_is_displayed(view) &&
2632             view->offset != view->p_offset &&
2633             view->lineno != view->p_lineno)
2634                 werase(view->win);
2635
2636         view->offset = view->p_offset;
2637         view->lineno = view->p_lineno;
2638         view->p_restore = FALSE;
2639
2640         return TRUE;
2641 }
2642
2643 static void
2644 end_update(struct view *view, bool force)
2645 {
2646         if (!view->pipe)
2647                 return;
2648         while (!view->ops->read(view, NULL))
2649                 if (!force)
2650                         return;
2651         set_nonblocking_input(FALSE);
2652         if (force)
2653                 kill_io(view->pipe);
2654         done_io(view->pipe);
2655         view->pipe = NULL;
2656 }
2657
2658 static void
2659 setup_update(struct view *view, const char *vid)
2660 {
2661         set_nonblocking_input(TRUE);
2662         reset_view(view);
2663         string_copy_rev(view->vid, vid);
2664         view->pipe = &view->io;
2665         view->start_time = time(NULL);
2666 }
2667
2668 static bool
2669 prepare_update(struct view *view, const char *argv[], const char *dir,
2670                enum format_flags flags)
2671 {
2672         if (view->pipe)
2673                 end_update(view, TRUE);
2674         return init_io_rd(&view->io, argv, dir, flags);
2675 }
2676
2677 static bool
2678 prepare_update_file(struct view *view, const char *name)
2679 {
2680         if (view->pipe)
2681                 end_update(view, TRUE);
2682         return io_open(&view->io, name);
2683 }
2684
2685 static bool
2686 begin_update(struct view *view, bool refresh)
2687 {
2688         if (view->pipe)
2689                 end_update(view, TRUE);
2690
2691         if (refresh) {
2692                 if (!start_io(&view->io))
2693                         return FALSE;
2694
2695         } else {
2696                 if (view == VIEW(REQ_VIEW_TREE) && strcmp(view->vid, view->id))
2697                         opt_path[0] = 0;
2698
2699                 if (!run_io_rd(&view->io, view->ops->argv, FORMAT_ALL))
2700                         return FALSE;
2701
2702                 /* Put the current ref_* value to the view title ref
2703                  * member. This is needed by the blob view. Most other
2704                  * views sets it automatically after loading because the
2705                  * first line is a commit line. */
2706                 string_copy_rev(view->ref, view->id);
2707         }
2708
2709         setup_update(view, view->id);
2710
2711         return TRUE;
2712 }
2713
2714 #define ITEM_CHUNK_SIZE 256
2715 static void *
2716 realloc_items(void *mem, size_t *size, size_t new_size, size_t item_size)
2717 {
2718         size_t num_chunks = *size / ITEM_CHUNK_SIZE;
2719         size_t num_chunks_new = (new_size + ITEM_CHUNK_SIZE - 1) / ITEM_CHUNK_SIZE;
2720
2721         if (mem == NULL || num_chunks != num_chunks_new) {
2722                 *size = num_chunks_new * ITEM_CHUNK_SIZE;
2723                 mem = realloc(mem, *size * item_size);
2724         }
2725
2726         return mem;
2727 }
2728
2729 static struct line *
2730 realloc_lines(struct view *view, size_t line_size)
2731 {
2732         size_t alloc = view->line_alloc;
2733         struct line *tmp = realloc_items(view->line, &alloc, line_size,
2734                                          sizeof(*view->line));
2735
2736         if (!tmp)
2737                 return NULL;
2738
2739         view->line = tmp;
2740         view->line_alloc = alloc;
2741         return view->line;
2742 }
2743
2744 static bool
2745 update_view(struct view *view)
2746 {
2747         char out_buffer[BUFSIZ * 2];
2748         char *line;
2749         /* Clear the view and redraw everything since the tree sorting
2750          * might have rearranged things. */
2751         bool redraw = view->lines == 0;
2752         bool can_read = TRUE;
2753
2754         if (!view->pipe)
2755                 return TRUE;
2756
2757         if (!io_can_read(view->pipe)) {
2758                 if (view->lines == 0) {
2759                         time_t secs = time(NULL) - view->start_time;
2760
2761                         if (secs > view->update_secs) {
2762                                 if (view->update_secs == 0)
2763                                         redraw_view(view);
2764                                 update_view_title(view);
2765                                 view->update_secs = secs;
2766                         }
2767                 }
2768                 return TRUE;
2769         }
2770
2771         for (; (line = io_get(view->pipe, '\n', can_read)); can_read = FALSE) {
2772                 if (opt_iconv != ICONV_NONE) {
2773                         ICONV_CONST char *inbuf = line;
2774                         size_t inlen = strlen(line) + 1;
2775
2776                         char *outbuf = out_buffer;
2777                         size_t outlen = sizeof(out_buffer);
2778
2779                         size_t ret;
2780
2781                         ret = iconv(opt_iconv, &inbuf, &inlen, &outbuf, &outlen);
2782                         if (ret != (size_t) -1)
2783                                 line = out_buffer;
2784                 }
2785
2786                 if (!view->ops->read(view, line)) {
2787                         report("Allocation failure");
2788                         end_update(view, TRUE);
2789                         return FALSE;
2790                 }
2791         }
2792
2793         {
2794                 unsigned long lines = view->lines;
2795                 int digits;
2796
2797                 for (digits = 0; lines; digits++)
2798                         lines /= 10;
2799
2800                 /* Keep the displayed view in sync with line number scaling. */
2801                 if (digits != view->digits) {
2802                         view->digits = digits;
2803                         if (opt_line_number || view == VIEW(REQ_VIEW_BLAME))
2804                                 redraw = TRUE;
2805                 }
2806         }
2807
2808         if (io_error(view->pipe)) {
2809                 report("Failed to read: %s", io_strerror(view->pipe));
2810                 end_update(view, TRUE);
2811
2812         } else if (io_eof(view->pipe)) {
2813                 report("");
2814                 end_update(view, FALSE);
2815         }
2816
2817         if (restore_view_position(view))
2818                 redraw = TRUE;
2819
2820         if (!view_is_displayed(view))
2821                 return TRUE;
2822
2823         if (redraw)
2824                 redraw_view_from(view, 0);
2825         else
2826                 redraw_view_dirty(view);
2827
2828         /* Update the title _after_ the redraw so that if the redraw picks up a
2829          * commit reference in view->ref it'll be available here. */
2830         update_view_title(view);
2831         return TRUE;
2832 }
2833
2834 static struct line *
2835 add_line_data(struct view *view, void *data, enum line_type type)
2836 {
2837         struct line *line;
2838
2839         if (!realloc_lines(view, view->lines + 1))
2840                 return NULL;
2841
2842         line = &view->line[view->lines++];
2843         memset(line, 0, sizeof(*line));
2844         line->type = type;
2845         line->data = data;
2846         line->dirty = 1;
2847
2848         return line;
2849 }
2850
2851 static struct line *
2852 add_line_text(struct view *view, const char *text, enum line_type type)
2853 {
2854         char *data = text ? strdup(text) : NULL;
2855
2856         return data ? add_line_data(view, data, type) : NULL;
2857 }
2858
2859 static struct line *
2860 add_line_format(struct view *view, enum line_type type, const char *fmt, ...)
2861 {
2862         char buf[SIZEOF_STR];
2863         va_list args;
2864
2865         va_start(args, fmt);
2866         if (vsnprintf(buf, sizeof(buf), fmt, args) >= sizeof(buf))
2867                 buf[0] = 0;
2868         va_end(args);
2869
2870         return buf[0] ? add_line_text(view, buf, type) : NULL;
2871 }
2872
2873 /*
2874  * View opening
2875  */
2876
2877 enum open_flags {
2878         OPEN_DEFAULT = 0,       /* Use default view switching. */
2879         OPEN_SPLIT = 1,         /* Split current view. */
2880         OPEN_BACKGROUNDED = 2,  /* Backgrounded. */
2881         OPEN_RELOAD = 4,        /* Reload view even if it is the current. */
2882         OPEN_NOMAXIMIZE = 8,    /* Do not maximize the current view. */
2883         OPEN_REFRESH = 16,      /* Refresh view using previous command. */
2884         OPEN_PREPARED = 32,     /* Open already prepared command. */
2885 };
2886
2887 static void
2888 open_view(struct view *prev, enum request request, enum open_flags flags)
2889 {
2890         bool backgrounded = !!(flags & OPEN_BACKGROUNDED);
2891         bool split = !!(flags & OPEN_SPLIT);
2892         bool reload = !!(flags & (OPEN_RELOAD | OPEN_REFRESH | OPEN_PREPARED));
2893         bool nomaximize = !!(flags & (OPEN_NOMAXIMIZE | OPEN_REFRESH));
2894         struct view *view = VIEW(request);
2895         int nviews = displayed_views();
2896         struct view *base_view = display[0];
2897
2898         if (view == prev && nviews == 1 && !reload) {
2899                 report("Already in %s view", view->name);
2900                 return;
2901         }
2902
2903         if (view->git_dir && !opt_git_dir[0]) {
2904                 report("The %s view is disabled in pager view", view->name);
2905                 return;
2906         }
2907
2908         if (split) {
2909                 display[1] = view;
2910                 if (!backgrounded)
2911                         current_view = 1;
2912         } else if (!nomaximize) {
2913                 /* Maximize the current view. */
2914                 memset(display, 0, sizeof(display));
2915                 current_view = 0;
2916                 display[current_view] = view;
2917         }
2918
2919         /* Resize the view when switching between split- and full-screen,
2920          * or when switching between two different full-screen views. */
2921         if (nviews != displayed_views() ||
2922             (nviews == 1 && base_view != display[0]))
2923                 resize_display();
2924
2925         if (view->ops->open) {
2926                 if (view->pipe)
2927                         end_update(view, TRUE);
2928                 if (!view->ops->open(view)) {
2929                         report("Failed to load %s view", view->name);
2930                         return;
2931                 }
2932                 restore_view_position(view);
2933
2934         } else if ((reload || strcmp(view->vid, view->id)) &&
2935                    !begin_update(view, flags & (OPEN_REFRESH | OPEN_PREPARED))) {
2936                 report("Failed to load %s view", view->name);
2937                 return;
2938         }
2939
2940         if (split && prev->lineno - prev->offset >= prev->height) {
2941                 /* Take the title line into account. */
2942                 int lines = prev->lineno - prev->offset - prev->height + 1;
2943
2944                 /* Scroll the view that was split if the current line is
2945                  * outside the new limited view. */
2946                 do_scroll_view(prev, lines);
2947         }
2948
2949         if (prev && view != prev) {
2950                 if (split && !backgrounded) {
2951                         /* "Blur" the previous view. */
2952                         update_view_title(prev);
2953                 }
2954
2955                 view->parent = prev;
2956         }
2957
2958         if (view->pipe && view->lines == 0) {
2959                 /* Clear the old view and let the incremental updating refill
2960                  * the screen. */
2961                 werase(view->win);
2962                 view->p_restore = flags & (OPEN_RELOAD | OPEN_REFRESH);
2963                 report("");
2964         } else if (view_is_displayed(view)) {
2965                 redraw_view(view);
2966                 report("");
2967         }
2968
2969         /* If the view is backgrounded the above calls to report()
2970          * won't redraw the view title. */
2971         if (backgrounded)
2972                 update_view_title(view);
2973 }
2974
2975 static void
2976 open_external_viewer(const char *argv[], const char *dir)
2977 {
2978         def_prog_mode();           /* save current tty modes */
2979         endwin();                  /* restore original tty modes */
2980         run_io_fg(argv, dir);
2981         fprintf(stderr, "Press Enter to continue");
2982         getc(opt_tty);
2983         reset_prog_mode();
2984         redraw_display(TRUE);
2985 }
2986
2987 static void
2988 open_mergetool(const char *file)
2989 {
2990         const char *mergetool_argv[] = { "git", "mergetool", file, NULL };
2991
2992         open_external_viewer(mergetool_argv, opt_cdup);
2993 }
2994
2995 static void
2996 open_editor(bool from_root, const char *file)
2997 {
2998         const char *editor_argv[] = { "vi", file, NULL };
2999         const char *editor;
3000
3001         editor = getenv("GIT_EDITOR");
3002         if (!editor && *opt_editor)
3003                 editor = opt_editor;
3004         if (!editor)
3005                 editor = getenv("VISUAL");
3006         if (!editor)
3007                 editor = getenv("EDITOR");
3008         if (!editor)
3009                 editor = "vi";
3010
3011         editor_argv[0] = editor;
3012         open_external_viewer(editor_argv, from_root ? opt_cdup : NULL);
3013 }
3014
3015 static void
3016 open_run_request(enum request request)
3017 {
3018         struct run_request *req = get_run_request(request);
3019         const char *argv[ARRAY_SIZE(req->argv)] = { NULL };
3020
3021         if (!req) {
3022                 report("Unknown run request");
3023                 return;
3024         }
3025
3026         if (format_argv(argv, req->argv, FORMAT_ALL))
3027                 open_external_viewer(argv, NULL);
3028         free_argv(argv);
3029 }
3030
3031 /*
3032  * User request switch noodle
3033  */
3034
3035 static int
3036 view_driver(struct view *view, enum request request)
3037 {
3038         int i;
3039
3040         if (request == REQ_NONE) {
3041                 doupdate();
3042                 return TRUE;
3043         }
3044
3045         if (request > REQ_NONE) {
3046                 open_run_request(request);
3047                 /* FIXME: When all views can refresh always do this. */
3048                 if (view == VIEW(REQ_VIEW_STATUS) ||
3049                     view == VIEW(REQ_VIEW_MAIN) ||
3050                     view == VIEW(REQ_VIEW_LOG) ||
3051                     view == VIEW(REQ_VIEW_STAGE))
3052                         request = REQ_REFRESH;
3053                 else
3054                         return TRUE;
3055         }
3056
3057         if (view && view->lines) {
3058                 request = view->ops->request(view, request, &view->line[view->lineno]);
3059                 if (request == REQ_NONE)
3060                         return TRUE;
3061         }
3062
3063         switch (request) {
3064         case REQ_MOVE_UP:
3065         case REQ_MOVE_DOWN:
3066         case REQ_MOVE_PAGE_UP:
3067         case REQ_MOVE_PAGE_DOWN:
3068         case REQ_MOVE_FIRST_LINE:
3069         case REQ_MOVE_LAST_LINE:
3070                 move_view(view, request);
3071                 break;
3072
3073         case REQ_SCROLL_LINE_DOWN:
3074         case REQ_SCROLL_LINE_UP:
3075         case REQ_SCROLL_PAGE_DOWN:
3076         case REQ_SCROLL_PAGE_UP:
3077                 scroll_view(view, request);
3078                 break;
3079
3080         case REQ_VIEW_BLAME:
3081                 if (!opt_file[0]) {
3082                         report("No file chosen, press %s to open tree view",
3083                                get_key(REQ_VIEW_TREE));
3084                         break;
3085                 }
3086                 open_view(view, request, OPEN_DEFAULT);
3087                 break;
3088
3089         case REQ_VIEW_BLOB:
3090                 if (!ref_blob[0]) {
3091                         report("No file chosen, press %s to open tree view",
3092                                get_key(REQ_VIEW_TREE));
3093                         break;
3094                 }
3095                 open_view(view, request, OPEN_DEFAULT);
3096                 break;
3097
3098         case REQ_VIEW_PAGER:
3099                 if (!VIEW(REQ_VIEW_PAGER)->pipe && !VIEW(REQ_VIEW_PAGER)->lines) {
3100                         report("No pager content, press %s to run command from prompt",
3101                                get_key(REQ_PROMPT));
3102                         break;
3103                 }
3104                 open_view(view, request, OPEN_DEFAULT);
3105                 break;
3106
3107         case REQ_VIEW_STAGE:
3108                 if (!VIEW(REQ_VIEW_STAGE)->lines) {
3109                         report("No stage content, press %s to open the status view and choose file",
3110                                get_key(REQ_VIEW_STATUS));
3111                         break;
3112                 }
3113                 open_view(view, request, OPEN_DEFAULT);
3114                 break;
3115
3116         case REQ_VIEW_STATUS:
3117                 if (opt_is_inside_work_tree == FALSE) {
3118                         report("The status view requires a working tree");
3119                         break;
3120                 }
3121                 open_view(view, request, OPEN_DEFAULT);
3122                 break;
3123
3124         case REQ_VIEW_MAIN:
3125         case REQ_VIEW_DIFF:
3126         case REQ_VIEW_LOG:
3127         case REQ_VIEW_TREE:
3128         case REQ_VIEW_HELP:
3129                 open_view(view, request, OPEN_DEFAULT);
3130                 break;
3131
3132         case REQ_NEXT:
3133         case REQ_PREVIOUS:
3134                 request = request == REQ_NEXT ? REQ_MOVE_DOWN : REQ_MOVE_UP;
3135
3136                 if ((view == VIEW(REQ_VIEW_DIFF) &&
3137                      view->parent == VIEW(REQ_VIEW_MAIN)) ||
3138                    (view == VIEW(REQ_VIEW_DIFF) &&
3139                      view->parent == VIEW(REQ_VIEW_BLAME)) ||
3140                    (view == VIEW(REQ_VIEW_STAGE) &&
3141                      view->parent == VIEW(REQ_VIEW_STATUS)) ||
3142                    (view == VIEW(REQ_VIEW_BLOB) &&
3143                      view->parent == VIEW(REQ_VIEW_TREE))) {
3144                         int line;
3145
3146                         view = view->parent;
3147                         line = view->lineno;
3148                         move_view(view, request);
3149                         if (view_is_displayed(view))
3150                                 update_view_title(view);
3151                         if (line != view->lineno)
3152                                 view->ops->request(view, REQ_ENTER,
3153                                                    &view->line[view->lineno]);
3154
3155                 } else {
3156                         move_view(view, request);
3157                 }
3158                 break;
3159
3160         case REQ_VIEW_NEXT:
3161         {
3162                 int nviews = displayed_views();
3163                 int next_view = (current_view + 1) % nviews;
3164
3165                 if (next_view == current_view) {
3166                         report("Only one view is displayed");
3167                         break;
3168                 }
3169
3170                 current_view = next_view;
3171                 /* Blur out the title of the previous view. */
3172                 update_view_title(view);
3173                 report("");
3174                 break;
3175         }
3176         case REQ_REFRESH:
3177                 report("Refreshing is not yet supported for the %s view", view->name);
3178                 break;
3179
3180         case REQ_MAXIMIZE:
3181                 if (displayed_views() == 2)
3182                         open_view(view, VIEW_REQ(view), OPEN_DEFAULT);
3183                 break;
3184
3185         case REQ_TOGGLE_LINENO:
3186                 toggle_view_option(&opt_line_number, "line numbers");
3187                 break;
3188
3189         case REQ_TOGGLE_DATE:
3190                 toggle_view_option(&opt_date, "date display");
3191                 break;
3192
3193         case REQ_TOGGLE_AUTHOR:
3194                 toggle_view_option(&opt_author, "author display");
3195                 break;
3196
3197         case REQ_TOGGLE_REV_GRAPH:
3198                 toggle_view_option(&opt_rev_graph, "revision graph display");
3199                 break;
3200
3201         case REQ_TOGGLE_REFS:
3202                 toggle_view_option(&opt_show_refs, "reference display");
3203                 break;
3204
3205         case REQ_SEARCH:
3206         case REQ_SEARCH_BACK:
3207                 search_view(view, request);
3208                 break;
3209
3210         case REQ_FIND_NEXT:
3211         case REQ_FIND_PREV:
3212                 find_next(view, request);
3213                 break;
3214
3215         case REQ_STOP_LOADING:
3216                 for (i = 0; i < ARRAY_SIZE(views); i++) {
3217                         view = &views[i];
3218                         if (view->pipe)
3219                                 report("Stopped loading the %s view", view->name),
3220                         end_update(view, TRUE);
3221                 }
3222                 break;
3223
3224         case REQ_SHOW_VERSION:
3225                 report("tig-%s (built %s)", TIG_VERSION, __DATE__);
3226                 return TRUE;
3227
3228         case REQ_SCREEN_REDRAW:
3229                 redraw_display(TRUE);
3230                 break;
3231
3232         case REQ_EDIT:
3233                 report("Nothing to edit");
3234                 break;
3235
3236         case REQ_ENTER:
3237                 report("Nothing to enter");
3238                 break;
3239
3240         case REQ_VIEW_CLOSE:
3241                 /* XXX: Mark closed views by letting view->parent point to the
3242                  * view itself. Parents to closed view should never be
3243                  * followed. */
3244                 if (view->parent &&
3245                     view->parent->parent != view->parent) {
3246                         memset(display, 0, sizeof(display));
3247                         current_view = 0;
3248                         display[current_view] = view->parent;
3249                         view->parent = view;
3250                         resize_display();
3251                         redraw_display(FALSE);
3252                         report("");
3253                         break;
3254                 }
3255                 /* Fall-through */
3256         case REQ_QUIT:
3257                 return FALSE;
3258
3259         default:
3260                 report("Unknown key, press 'h' for help");
3261                 return TRUE;
3262         }
3263
3264         return TRUE;
3265 }
3266
3267
3268 /*
3269  * View backend utilities
3270  */
3271
3272 /* Parse author lines where the name may be empty:
3273  *      author  <email@address.tld> 1138474660 +0100
3274  */
3275 static void
3276 parse_author_line(char *ident, char *author, size_t authorsize, struct tm *tm)
3277 {
3278         char *nameend = strchr(ident, '<');
3279         char *emailend = strchr(ident, '>');
3280
3281         if (nameend && emailend)
3282                 *nameend = *emailend = 0;
3283         ident = chomp_string(ident);
3284         if (!*ident) {
3285                 if (nameend)
3286                         ident = chomp_string(nameend + 1);
3287                 if (!*ident)
3288                         ident = "Unknown";
3289         }
3290
3291         string_ncopy_do(author, authorsize, ident, strlen(ident));
3292
3293         /* Parse epoch and timezone */
3294         if (emailend && emailend[1] == ' ') {
3295                 char *secs = emailend + 2;
3296                 char *zone = strchr(secs, ' ');
3297                 time_t time = (time_t) atol(secs);
3298
3299                 if (zone && strlen(zone) == STRING_SIZE(" +0700")) {
3300                         long tz;
3301
3302                         zone++;
3303                         tz  = ('0' - zone[1]) * 60 * 60 * 10;
3304                         tz += ('0' - zone[2]) * 60 * 60;
3305                         tz += ('0' - zone[3]) * 60;
3306                         tz += ('0' - zone[4]) * 60;
3307
3308                         if (zone[0] == '-')
3309                                 tz = -tz;
3310
3311                         time -= tz;
3312                 }
3313
3314                 gmtime_r(&time, tm);
3315         }
3316 }
3317
3318 /*
3319  * Pager backend
3320  */
3321
3322 static bool
3323 pager_draw(struct view *view, struct line *line, unsigned int lineno)
3324 {
3325         char *text = line->data;
3326
3327         if (opt_line_number && draw_lineno(view, lineno))
3328                 return TRUE;
3329
3330         draw_text(view, line->type, text, TRUE);
3331         return TRUE;
3332 }
3333
3334 static bool
3335 add_describe_ref(char *buf, size_t *bufpos, const char *commit_id, const char *sep)
3336 {
3337         const char *describe_argv[] = { "git", "describe", commit_id, NULL };
3338         char refbuf[SIZEOF_STR];
3339         char *ref = NULL;
3340
3341         if (run_io_buf(describe_argv, refbuf, sizeof(refbuf)))
3342                 ref = chomp_string(refbuf);
3343
3344         if (!ref || !*ref)
3345                 return TRUE;
3346
3347         /* This is the only fatal call, since it can "corrupt" the buffer. */
3348         if (!string_nformat(buf, SIZEOF_STR, bufpos, "%s%s", sep, ref))
3349                 return FALSE;
3350
3351         return TRUE;
3352 }
3353
3354 static void
3355 add_pager_refs(struct view *view, struct line *line)
3356 {
3357         char buf[SIZEOF_STR];
3358         char *commit_id = (char *)line->data + STRING_SIZE("commit ");
3359         struct ref **refs;
3360         size_t bufpos = 0, refpos = 0;
3361         const char *sep = "Refs: ";
3362         bool is_tag = FALSE;
3363
3364         assert(line->type == LINE_COMMIT);
3365
3366         refs = get_refs(commit_id);
3367         if (!refs) {
3368                 if (view == VIEW(REQ_VIEW_DIFF))
3369                         goto try_add_describe_ref;
3370                 return;
3371         }
3372
3373         do {
3374                 struct ref *ref = refs[refpos];
3375                 const char *fmt = ref->tag    ? "%s[%s]" :
3376                                   ref->remote ? "%s<%s>" : "%s%s";
3377
3378                 if (!string_format_from(buf, &bufpos, fmt, sep, ref->name))
3379                         return;
3380                 sep = ", ";
3381                 if (ref->tag)
3382                         is_tag = TRUE;
3383         } while (refs[refpos++]->next);
3384
3385         if (!is_tag && view == VIEW(REQ_VIEW_DIFF)) {
3386 try_add_describe_ref:
3387                 /* Add <tag>-g<commit_id> "fake" reference. */
3388                 if (!add_describe_ref(buf, &bufpos, commit_id, sep))
3389                         return;
3390         }
3391
3392         if (bufpos == 0)
3393                 return;
3394
3395         add_line_text(view, buf, LINE_PP_REFS);
3396 }
3397
3398 static bool
3399 pager_read(struct view *view, char *data)
3400 {
3401         struct line *line;
3402
3403         if (!data)
3404                 return TRUE;
3405
3406         line = add_line_text(view, data, get_line_type(data));
3407         if (!line)
3408                 return FALSE;
3409
3410         if (line->type == LINE_COMMIT &&
3411             (view == VIEW(REQ_VIEW_DIFF) ||
3412              view == VIEW(REQ_VIEW_LOG)))
3413                 add_pager_refs(view, line);
3414
3415         return TRUE;
3416 }
3417
3418 static enum request
3419 pager_request(struct view *view, enum request request, struct line *line)
3420 {
3421         int split = 0;
3422
3423         if (request != REQ_ENTER)
3424                 return request;
3425
3426         if (line->type == LINE_COMMIT &&
3427            (view == VIEW(REQ_VIEW_LOG) ||
3428             view == VIEW(REQ_VIEW_PAGER))) {
3429                 open_view(view, REQ_VIEW_DIFF, OPEN_SPLIT);
3430                 split = 1;
3431         }
3432
3433         /* Always scroll the view even if it was split. That way
3434          * you can use Enter to scroll through the log view and
3435          * split open each commit diff. */
3436         scroll_view(view, REQ_SCROLL_LINE_DOWN);
3437
3438         /* FIXME: A minor workaround. Scrolling the view will call report("")
3439          * but if we are scrolling a non-current view this won't properly
3440          * update the view title. */
3441         if (split)
3442                 update_view_title(view);
3443
3444         return REQ_NONE;
3445 }
3446
3447 static bool
3448 pager_grep(struct view *view, struct line *line)
3449 {
3450         regmatch_t pmatch;
3451         char *text = line->data;
3452
3453         if (!*text)
3454                 return FALSE;
3455
3456         if (regexec(view->regex, text, 1, &pmatch, 0) == REG_NOMATCH)
3457                 return FALSE;
3458
3459         return TRUE;
3460 }
3461
3462 static void
3463 pager_select(struct view *view, struct line *line)
3464 {
3465         if (line->type == LINE_COMMIT) {
3466                 char *text = (char *)line->data + STRING_SIZE("commit ");
3467
3468                 if (view != VIEW(REQ_VIEW_PAGER))
3469                         string_copy_rev(view->ref, text);
3470                 string_copy_rev(ref_commit, text);
3471         }
3472 }
3473
3474 static struct view_ops pager_ops = {
3475         "line",
3476         NULL,
3477         NULL,
3478         pager_read,
3479         pager_draw,
3480         pager_request,
3481         pager_grep,
3482         pager_select,
3483 };
3484
3485 static const char *log_argv[SIZEOF_ARG] = {
3486         "git", "log", "--no-color", "--cc", "--stat", "-n100", "%(head)", NULL
3487 };
3488
3489 static enum request
3490 log_request(struct view *view, enum request request, struct line *line)
3491 {
3492         switch (request) {
3493         case REQ_REFRESH:
3494                 load_refs();
3495                 open_view(view, REQ_VIEW_LOG, OPEN_REFRESH);
3496                 return REQ_NONE;
3497         default:
3498                 return pager_request(view, request, line);
3499         }
3500 }
3501
3502 static struct view_ops log_ops = {
3503         "line",
3504         log_argv,
3505         NULL,
3506         pager_read,
3507         pager_draw,
3508         log_request,
3509         pager_grep,
3510         pager_select,
3511 };
3512
3513 static const char *diff_argv[SIZEOF_ARG] = {
3514         "git", "show", "--pretty=fuller", "--no-color", "--root",
3515                 "--patch-with-stat", "--find-copies-harder", "-C", "%(commit)", NULL
3516 };
3517
3518 static struct view_ops diff_ops = {
3519         "line",
3520         diff_argv,
3521         NULL,
3522         pager_read,
3523         pager_draw,
3524         pager_request,
3525         pager_grep,
3526         pager_select,
3527 };
3528
3529 /*
3530  * Help backend
3531  */
3532
3533 static bool
3534 help_open(struct view *view)
3535 {
3536         int lines = ARRAY_SIZE(req_info) + 2;
3537         int i;
3538
3539         if (view->lines > 0)
3540                 return TRUE;
3541
3542         for (i = 0; i < ARRAY_SIZE(req_info); i++)
3543                 if (!req_info[i].request)
3544                         lines++;
3545
3546         lines += run_requests + 1;
3547
3548         view->line = calloc(lines, sizeof(*view->line));
3549         if (!view->line)
3550                 return FALSE;
3551
3552         add_line_text(view, "Quick reference for tig keybindings:", LINE_DEFAULT);
3553
3554         for (i = 0; i < ARRAY_SIZE(req_info); i++) {
3555                 const char *key;
3556
3557                 if (req_info[i].request == REQ_NONE)
3558                         continue;
3559
3560                 if (!req_info[i].request) {
3561                         add_line_text(view, "", LINE_DEFAULT);
3562                         add_line_text(view, req_info[i].help, LINE_DEFAULT);
3563                         continue;
3564                 }
3565
3566                 key = get_key(req_info[i].request);
3567                 if (!*key)
3568                         key = "(no key defined)";
3569
3570                 add_line_format(view, LINE_DEFAULT, "    %-25s %s",
3571                                 key, req_info[i].help);
3572         }
3573
3574         if (run_requests) {
3575                 add_line_text(view, "", LINE_DEFAULT);
3576                 add_line_text(view, "External commands:", LINE_DEFAULT);
3577         }
3578
3579         for (i = 0; i < run_requests; i++) {
3580                 struct run_request *req = get_run_request(REQ_NONE + i + 1);
3581                 const char *key;
3582                 char cmd[SIZEOF_STR];
3583                 size_t bufpos;
3584                 int argc;
3585
3586                 if (!req)
3587                         continue;
3588
3589                 key = get_key_name(req->key);
3590                 if (!*key)
3591                         key = "(no key defined)";
3592
3593                 for (bufpos = 0, argc = 0; req->argv[argc]; argc++)
3594                         if (!string_format_from(cmd, &bufpos, "%s%s",
3595                                                 argc ? " " : "", req->argv[argc]))
3596                                 return REQ_NONE;
3597
3598                 add_line_format(view, LINE_DEFAULT, "    %-10s %-14s `%s`",
3599                                 keymap_table[req->keymap].name, key, cmd);
3600         }
3601
3602         return TRUE;
3603 }
3604
3605 static struct view_ops help_ops = {
3606         "line",
3607         NULL,
3608         help_open,
3609         NULL,
3610         pager_draw,
3611         pager_request,
3612         pager_grep,
3613         pager_select,
3614 };
3615
3616
3617 /*
3618  * Tree backend
3619  */
3620
3621 struct tree_stack_entry {
3622         struct tree_stack_entry *prev;  /* Entry below this in the stack */
3623         unsigned long lineno;           /* Line number to restore */
3624         char *name;                     /* Position of name in opt_path */
3625 };
3626
3627 /* The top of the path stack. */
3628 static struct tree_stack_entry *tree_stack = NULL;
3629 unsigned long tree_lineno = 0;
3630
3631 static void
3632 pop_tree_stack_entry(void)
3633 {
3634         struct tree_stack_entry *entry = tree_stack;
3635
3636         tree_lineno = entry->lineno;
3637         entry->name[0] = 0;
3638         tree_stack = entry->prev;
3639         free(entry);
3640 }
3641
3642 static void
3643 push_tree_stack_entry(const char *name, unsigned long lineno)
3644 {
3645         struct tree_stack_entry *entry = calloc(1, sizeof(*entry));
3646         size_t pathlen = strlen(opt_path);
3647
3648         if (!entry)
3649                 return;
3650
3651         entry->prev = tree_stack;
3652         entry->name = opt_path + pathlen;
3653         tree_stack = entry;
3654
3655         if (!string_format_from(opt_path, &pathlen, "%s/", name)) {
3656                 pop_tree_stack_entry();
3657                 return;
3658         }
3659
3660         /* Move the current line to the first tree entry. */
3661         tree_lineno = 1;
3662         entry->lineno = lineno;
3663 }
3664
3665 /* Parse output from git-ls-tree(1):
3666  *
3667  * 100644 blob fb0e31ea6cc679b7379631188190e975f5789c26 Makefile
3668  * 100644 blob 5304ca4260aaddaee6498f9630e7d471b8591ea6 README
3669  * 100644 blob f931e1d229c3e185caad4449bf5b66ed72462657 tig.c
3670  * 100644 blob ed09fe897f3c7c9af90bcf80cae92558ea88ae38 web.conf
3671  */
3672
3673 #define SIZEOF_TREE_ATTR \
3674         STRING_SIZE("100644 blob ed09fe897f3c7c9af90bcf80cae92558ea88ae38\t")
3675
3676 #define TREE_UP_FORMAT "040000 tree %s\t.."
3677
3678 static const char *
3679 tree_path(struct line *line)
3680 {
3681         const char *path = line->data;
3682
3683         return path + SIZEOF_TREE_ATTR;
3684 }
3685
3686 static int
3687 tree_compare_entry(struct line *line1, struct line *line2)
3688 {
3689         if (line1->type != line2->type)
3690                 return line1->type == LINE_TREE_DIR ? -1 : 1;
3691         return strcmp(tree_path(line1), tree_path(line2));
3692 }
3693
3694 static bool
3695 tree_read(struct view *view, char *text)
3696 {
3697         size_t textlen = text ? strlen(text) : 0;
3698         struct line *entry, *line;
3699         enum line_type type;
3700
3701         if (!text)
3702                 return TRUE;
3703         if (textlen <= SIZEOF_TREE_ATTR)
3704                 return FALSE;
3705
3706         type = text[STRING_SIZE("100644 ")] == 't'
3707              ? LINE_TREE_DIR : LINE_TREE_FILE;
3708
3709         if (view->lines == 0 &&
3710             !add_line_format(view, LINE_DEFAULT, "Directory path /%s", opt_path))
3711                 return FALSE;
3712
3713         /* Strip the path part ... */
3714         if (*opt_path) {
3715                 size_t pathlen = textlen - SIZEOF_TREE_ATTR;
3716                 size_t striplen = strlen(opt_path);
3717                 char *path = text + SIZEOF_TREE_ATTR;
3718
3719                 if (pathlen > striplen)
3720                         memmove(path, path + striplen,
3721                                 pathlen - striplen + 1);
3722
3723                 /* Insert "link" to parent directory. */
3724                 if (view->lines == 1 &&
3725                     !add_line_format(view, LINE_TREE_DIR, TREE_UP_FORMAT, view->ref))
3726                         return FALSE;
3727         }
3728
3729         entry = add_line_text(view, text, type);
3730         if (!entry)
3731                 return FALSE;
3732         text = entry->data;
3733
3734         /* Skip "Directory ..." and ".." line. */
3735         for (line = &view->line[1 + !!*opt_path]; line < entry; line++) {
3736                 if (tree_compare_entry(line, entry) <= 0)
3737                         continue;
3738
3739                 memmove(line + 1, line, (entry - line) * sizeof(*entry));
3740
3741                 line->data = text;
3742                 line->type = type;
3743                 for (; line <= entry; line++)
3744                         line->dirty = line->cleareol = 1;
3745                 return TRUE;
3746         }
3747
3748         if (tree_lineno > view->lineno) {
3749                 view->lineno = tree_lineno;
3750                 tree_lineno = 0;
3751         }
3752
3753         return TRUE;
3754 }
3755
3756 static void
3757 open_blob_editor()
3758 {
3759         char file[SIZEOF_STR] = "/tmp/tigblob.XXXXXX";
3760         int fd = mkstemp(file);
3761
3762         if (fd == -1)
3763                 report("Failed to create temporary file");
3764         else if (!run_io_append(blob_ops.argv, FORMAT_ALL, fd))
3765                 report("Failed to save blob data to file");
3766         else
3767                 open_editor(FALSE, file);
3768         if (fd != -1)
3769                 unlink(file);
3770 }
3771
3772 static enum request
3773 tree_request(struct view *view, enum request request, struct line *line)
3774 {
3775         enum open_flags flags;
3776
3777         switch (request) {
3778         case REQ_VIEW_BLAME:
3779                 if (line->type != LINE_TREE_FILE) {
3780                         report("Blame only supported for files");
3781                         return REQ_NONE;
3782                 }
3783
3784                 string_copy(opt_ref, view->vid);
3785                 return request;
3786
3787         case REQ_EDIT:
3788                 if (line->type != LINE_TREE_FILE) {
3789                         report("Edit only supported for files");
3790                 } else if (!is_head_commit(view->vid)) {
3791                         open_blob_editor();
3792                 } else {
3793                         open_editor(TRUE, opt_file);
3794                 }
3795                 return REQ_NONE;
3796
3797         case REQ_TREE_PARENT:
3798                 if (!*opt_path) {
3799                         /* quit view if at top of tree */
3800                         return REQ_VIEW_CLOSE;
3801                 }
3802                 /* fake 'cd  ..' */
3803                 line = &view->line[1];
3804                 break;
3805
3806         case REQ_ENTER:
3807                 break;
3808
3809         default:
3810                 return request;
3811         }
3812
3813         /* Cleanup the stack if the tree view is at a different tree. */
3814         while (!*opt_path && tree_stack)
3815                 pop_tree_stack_entry();
3816
3817         switch (line->type) {
3818         case LINE_TREE_DIR:
3819                 /* Depending on whether it is a subdir or parent (updir?) link
3820                  * mangle the path buffer. */
3821                 if (line == &view->line[1] && *opt_path) {
3822                         pop_tree_stack_entry();
3823
3824                 } else {
3825                         const char *basename = tree_path(line);
3826
3827                         push_tree_stack_entry(basename, view->lineno);
3828                 }
3829
3830                 /* Trees and subtrees share the same ID, so they are not not
3831                  * unique like blobs. */
3832                 flags = OPEN_RELOAD;
3833                 request = REQ_VIEW_TREE;
3834                 break;
3835
3836         case LINE_TREE_FILE:
3837                 flags = display[0] == view ? OPEN_SPLIT : OPEN_DEFAULT;
3838                 request = REQ_VIEW_BLOB;
3839                 break;
3840
3841         default:
3842                 return TRUE;
3843         }
3844
3845         open_view(view, request, flags);
3846         if (request == REQ_VIEW_TREE) {
3847                 view->lineno = tree_lineno;
3848         }
3849
3850         return REQ_NONE;
3851 }
3852
3853 static void
3854 tree_select(struct view *view, struct line *line)
3855 {
3856         char *text = (char *)line->data + STRING_SIZE("100644 blob ");
3857
3858         if (line->type == LINE_TREE_FILE) {
3859                 string_copy_rev(ref_blob, text);
3860                 string_format(opt_file, "%s%s", opt_path, tree_path(line));
3861
3862         } else if (line->type != LINE_TREE_DIR) {
3863                 return;
3864         }
3865
3866         string_copy_rev(view->ref, text);
3867 }
3868
3869 static const char *tree_argv[SIZEOF_ARG] = {
3870         "git", "ls-tree", "%(commit)", "%(directory)", NULL
3871 };
3872
3873 static struct view_ops tree_ops = {
3874         "file",
3875         tree_argv,
3876         NULL,
3877         tree_read,
3878         pager_draw,
3879         tree_request,
3880         pager_grep,
3881         tree_select,
3882 };
3883
3884 static bool
3885 blob_read(struct view *view, char *line)
3886 {
3887         if (!line)
3888                 return TRUE;
3889         return add_line_text(view, line, LINE_DEFAULT) != NULL;
3890 }
3891
3892 static enum request
3893 blob_request(struct view *view, enum request request, struct line *line)
3894 {
3895         switch (request) {
3896         case REQ_EDIT:
3897                 open_blob_editor();
3898                 return REQ_NONE;
3899         default:
3900                 return pager_request(view, request, line);
3901         }
3902 }
3903
3904 static const char *blob_argv[SIZEOF_ARG] = {
3905         "git", "cat-file", "blob", "%(blob)", NULL
3906 };
3907
3908 static struct view_ops blob_ops = {
3909         "line",
3910         blob_argv,
3911         NULL,
3912         blob_read,
3913         pager_draw,
3914         blob_request,
3915         pager_grep,
3916         pager_select,
3917 };
3918
3919 /*
3920  * Blame backend
3921  *
3922  * Loading the blame view is a two phase job:
3923  *
3924  *  1. File content is read either using opt_file from the
3925  *     filesystem or using git-cat-file.
3926  *  2. Then blame information is incrementally added by
3927  *     reading output from git-blame.
3928  */
3929
3930 static const char *blame_head_argv[] = {
3931         "git", "blame", "--incremental", "--", "%(file)", NULL
3932 };
3933
3934 static const char *blame_ref_argv[] = {
3935         "git", "blame", "--incremental", "%(ref)", "--", "%(file)", NULL
3936 };
3937
3938 static const char *blame_cat_file_argv[] = {
3939         "git", "cat-file", "blob", "%(ref):%(file)", NULL
3940 };
3941
3942 struct blame_commit {
3943         char id[SIZEOF_REV];            /* SHA1 ID. */
3944         char title[128];                /* First line of the commit message. */
3945         char author[75];                /* Author of the commit. */
3946         struct tm time;                 /* Date from the author ident. */
3947         char filename[128];             /* Name of file. */
3948         bool has_previous;              /* Was a "previous" line detected. */
3949 };
3950
3951 struct blame {
3952         struct blame_commit *commit;
3953         char text[1];
3954 };
3955
3956 static bool
3957 blame_open(struct view *view)
3958 {
3959         if (*opt_ref || !io_open(&view->io, opt_file)) {
3960                 if (!run_io_rd(&view->io, blame_cat_file_argv, FORMAT_ALL))
3961                         return FALSE;
3962         }
3963
3964         setup_update(view, opt_file);
3965         string_format(view->ref, "%s ...", opt_file);
3966
3967         return TRUE;
3968 }
3969
3970 static struct blame_commit *
3971 get_blame_commit(struct view *view, const char *id)
3972 {
3973         size_t i;
3974
3975         for (i = 0; i < view->lines; i++) {
3976                 struct blame *blame = view->line[i].data;
3977
3978                 if (!blame->commit)
3979                         continue;
3980
3981                 if (!strncmp(blame->commit->id, id, SIZEOF_REV - 1))
3982                         return blame->commit;
3983         }
3984
3985         {
3986                 struct blame_commit *commit = calloc(1, sizeof(*commit));
3987
3988                 if (commit)
3989                         string_ncopy(commit->id, id, SIZEOF_REV);
3990                 return commit;
3991         }
3992 }
3993
3994 static bool
3995 parse_number(const char **posref, size_t *number, size_t min, size_t max)
3996 {
3997         const char *pos = *posref;
3998
3999         *posref = NULL;
4000         pos = strchr(pos + 1, ' ');
4001         if (!pos || !isdigit(pos[1]))
4002                 return FALSE;
4003         *number = atoi(pos + 1);
4004         if (*number < min || *number > max)
4005                 return FALSE;
4006
4007         *posref = pos;
4008         return TRUE;
4009 }
4010
4011 static struct blame_commit *
4012 parse_blame_commit(struct view *view, const char *text, int *blamed)
4013 {
4014         struct blame_commit *commit;
4015         struct blame *blame;
4016         const char *pos = text + SIZEOF_REV - 1;
4017         size_t lineno;
4018         size_t group;
4019
4020         if (strlen(text) <= SIZEOF_REV || *pos != ' ')
4021                 return NULL;
4022
4023         if (!parse_number(&pos, &lineno, 1, view->lines) ||
4024             !parse_number(&pos, &group, 1, view->lines - lineno + 1))
4025                 return NULL;
4026
4027         commit = get_blame_commit(view, text);
4028         if (!commit)
4029                 return NULL;
4030
4031         *blamed += group;
4032         while (group--) {
4033                 struct line *line = &view->line[lineno + group - 1];
4034
4035                 blame = line->data;
4036                 blame->commit = commit;
4037                 line->dirty = 1;
4038         }
4039
4040         return commit;
4041 }
4042
4043 static bool
4044 blame_read_file(struct view *view, const char *line, bool *read_file)
4045 {
4046         if (!line) {
4047                 const char **argv = *opt_ref ? blame_ref_argv : blame_head_argv;
4048                 struct io io = {};
4049
4050                 if (view->lines == 0 && !view->parent)
4051                         die("No blame exist for %s", view->vid);
4052
4053                 if (view->lines == 0 || !run_io_rd(&io, argv, FORMAT_ALL)) {
4054                         report("Failed to load blame data");
4055                         return TRUE;
4056                 }
4057
4058                 done_io(view->pipe);
4059                 view->io = io;
4060                 *read_file = FALSE;
4061                 return FALSE;
4062
4063         } else {
4064                 size_t linelen = strlen(line);
4065                 struct blame *blame = malloc(sizeof(*blame) + linelen);
4066
4067                 blame->commit = NULL;
4068                 strncpy(blame->text, line, linelen);
4069                 blame->text[linelen] = 0;
4070                 return add_line_data(view, blame, LINE_BLAME_ID) != NULL;
4071         }
4072 }
4073
4074 static bool
4075 match_blame_header(const char *name, char **line)
4076 {
4077         size_t namelen = strlen(name);
4078         bool matched = !strncmp(name, *line, namelen);
4079
4080         if (matched)
4081                 *line += namelen;
4082
4083         return matched;
4084 }
4085
4086 static bool
4087 blame_read(struct view *view, char *line)
4088 {
4089         static struct blame_commit *commit = NULL;
4090         static int blamed = 0;
4091         static time_t author_time;
4092         static bool read_file = TRUE;
4093
4094         if (read_file)
4095                 return blame_read_file(view, line, &read_file);
4096
4097         if (!line) {
4098                 /* Reset all! */
4099                 commit = NULL;
4100                 blamed = 0;
4101                 read_file = TRUE;
4102                 string_format(view->ref, "%s", view->vid);
4103                 if (view_is_displayed(view)) {
4104                         update_view_title(view);
4105                         redraw_view_from(view, 0);
4106                 }
4107                 return TRUE;
4108         }
4109
4110         if (!commit) {
4111                 commit = parse_blame_commit(view, line, &blamed);
4112                 string_format(view->ref, "%s %2d%%", view->vid,
4113                               view->lines ? blamed * 100 / view->lines : 0);
4114
4115         } else if (match_blame_header("author ", &line)) {
4116                 string_ncopy(commit->author, line, strlen(line));
4117
4118         } else if (match_blame_header("author-time ", &line)) {
4119                 author_time = (time_t) atol(line);
4120
4121         } else if (match_blame_header("author-tz ", &line)) {
4122                 long tz;
4123
4124                 tz  = ('0' - line[1]) * 60 * 60 * 10;
4125                 tz += ('0' - line[2]) * 60 * 60;
4126                 tz += ('0' - line[3]) * 60;
4127                 tz += ('0' - line[4]) * 60;
4128
4129                 if (line[0] == '-')
4130                         tz = -tz;
4131
4132                 author_time -= tz;
4133                 gmtime_r(&author_time, &commit->time);
4134
4135         } else if (match_blame_header("summary ", &line)) {
4136                 string_ncopy(commit->title, line, strlen(line));
4137
4138         } else if (match_blame_header("previous ", &line)) {
4139                 commit->has_previous = TRUE;
4140
4141         } else if (match_blame_header("filename ", &line)) {
4142                 string_ncopy(commit->filename, line, strlen(line));
4143                 commit = NULL;
4144         }
4145
4146         return TRUE;
4147 }
4148
4149 static bool
4150 blame_draw(struct view *view, struct line *line, unsigned int lineno)
4151 {
4152         struct blame *blame = line->data;
4153         struct tm *time = NULL;
4154         const char *id = NULL, *author = NULL;
4155
4156         if (blame->commit && *blame->commit->filename) {
4157                 id = blame->commit->id;
4158                 author = blame->commit->author;
4159                 time = &blame->commit->time;
4160         }
4161
4162         if (opt_date && draw_date(view, time))
4163                 return TRUE;
4164
4165         if (opt_author &&
4166             draw_field(view, LINE_MAIN_AUTHOR, author, opt_author_cols, TRUE))
4167                 return TRUE;
4168
4169         if (draw_field(view, LINE_BLAME_ID, id, ID_COLS, FALSE))
4170                 return TRUE;
4171
4172         if (draw_lineno(view, lineno))
4173                 return TRUE;
4174
4175         draw_text(view, LINE_DEFAULT, blame->text, TRUE);
4176         return TRUE;
4177 }
4178
4179 static bool
4180 check_blame_commit(struct blame *blame)
4181 {
4182         if (!blame->commit)
4183                 report("Commit data not loaded yet");
4184         else if (!strcmp(blame->commit->id, NULL_ID))
4185                 report("No commit exist for the selected line");
4186         else
4187                 return TRUE;
4188         return FALSE;
4189 }
4190
4191 static enum request
4192 blame_request(struct view *view, enum request request, struct line *line)
4193 {
4194         enum open_flags flags = display[0] == view ? OPEN_SPLIT : OPEN_DEFAULT;
4195         struct blame *blame = line->data;
4196
4197         switch (request) {
4198         case REQ_VIEW_BLAME:
4199                 if (check_blame_commit(blame)) {
4200                         string_copy(opt_ref, blame->commit->id);
4201                         open_view(view, REQ_VIEW_BLAME, OPEN_REFRESH);
4202                 }
4203                 break;
4204
4205         case REQ_ENTER:
4206                 if (!blame->commit) {
4207                         report("No commit loaded yet");
4208                         break;
4209                 }
4210
4211                 if (view_is_displayed(VIEW(REQ_VIEW_DIFF)) &&
4212                     !strcmp(blame->commit->id, VIEW(REQ_VIEW_DIFF)->ref))
4213                         break;
4214
4215                 if (!strcmp(blame->commit->id, NULL_ID)) {
4216                         struct view *diff = VIEW(REQ_VIEW_DIFF);
4217                         const char *diff_index_argv[] = {
4218                                 "git", "diff-index", "--root", "--patch-with-stat",
4219                                         "-C", "-M", "HEAD", "--", view->vid, NULL
4220                         };
4221
4222                         if (!blame->commit->has_previous) {
4223                                 diff_index_argv[1] = "diff";
4224                                 diff_index_argv[2] = "--no-color";
4225                                 diff_index_argv[6] = "--";
4226                                 diff_index_argv[7] = "/dev/null";
4227                         }
4228
4229                         if (!prepare_update(diff, diff_index_argv, NULL, FORMAT_DASH)) {
4230                                 report("Failed to allocate diff command");
4231                                 break;
4232                         }
4233                         flags |= OPEN_PREPARED;
4234                 }
4235
4236                 open_view(view, REQ_VIEW_DIFF, flags);
4237                 if (VIEW(REQ_VIEW_DIFF)->pipe && !strcmp(blame->commit->id, NULL_ID))
4238                         string_copy_rev(VIEW(REQ_VIEW_DIFF)->ref, NULL_ID);
4239                 break;
4240
4241         default:
4242                 return request;
4243         }
4244
4245         return REQ_NONE;
4246 }
4247
4248 static bool
4249 blame_grep(struct view *view, struct line *line)
4250 {
4251         struct blame *blame = line->data;
4252         struct blame_commit *commit = blame->commit;
4253         regmatch_t pmatch;
4254
4255 #define MATCH(text, on)                                                 \
4256         (on && *text && regexec(view->regex, text, 1, &pmatch, 0) != REG_NOMATCH)
4257
4258         if (commit) {
4259                 char buf[DATE_COLS + 1];
4260
4261                 if (MATCH(commit->title, 1) ||
4262                     MATCH(commit->author, opt_author) ||
4263                     MATCH(commit->id, opt_date))
4264                         return TRUE;
4265
4266                 if (strftime(buf, sizeof(buf), DATE_FORMAT, &commit->time) &&
4267                     MATCH(buf, 1))
4268                         return TRUE;
4269         }
4270
4271         return MATCH(blame->text, 1);
4272
4273 #undef MATCH
4274 }
4275
4276 static void
4277 blame_select(struct view *view, struct line *line)
4278 {
4279         struct blame *blame = line->data;
4280         struct blame_commit *commit = blame->commit;
4281
4282         if (!commit)
4283                 return;
4284
4285         if (!strcmp(commit->id, NULL_ID))
4286                 string_ncopy(ref_commit, "HEAD", 4);
4287         else
4288                 string_copy_rev(ref_commit, commit->id);
4289 }
4290
4291 static struct view_ops blame_ops = {
4292         "line",
4293         NULL,
4294         blame_open,
4295         blame_read,
4296         blame_draw,
4297         blame_request,
4298         blame_grep,
4299         blame_select,
4300 };
4301
4302 /*
4303  * Status backend
4304  */
4305
4306 struct status {
4307         char status;
4308         struct {
4309                 mode_t mode;
4310                 char rev[SIZEOF_REV];
4311                 char name[SIZEOF_STR];
4312         } old;
4313         struct {
4314                 mode_t mode;
4315                 char rev[SIZEOF_REV];
4316                 char name[SIZEOF_STR];
4317         } new;
4318 };
4319
4320 static char status_onbranch[SIZEOF_STR];
4321 static struct status stage_status;
4322 static enum line_type stage_line_type;
4323 static size_t stage_chunks;
4324 static int *stage_chunk;
4325
4326 /* This should work even for the "On branch" line. */
4327 static inline bool
4328 status_has_none(struct view *view, struct line *line)
4329 {
4330         return line < view->line + view->lines && !line[1].data;
4331 }
4332
4333 /* Get fields from the diff line:
4334  * :100644 100644 06a5d6ae9eca55be2e0e585a152e6b1336f2b20e 0000000000000000000000000000000000000000 M
4335  */
4336 static inline bool
4337 status_get_diff(struct status *file, const char *buf, size_t bufsize)
4338 {
4339         const char *old_mode = buf +  1;
4340         const char *new_mode = buf +  8;
4341         const char *old_rev  = buf + 15;
4342         const char *new_rev  = buf + 56;
4343         const char *status   = buf + 97;
4344
4345         if (bufsize < 98 ||
4346             old_mode[-1] != ':' ||
4347             new_mode[-1] != ' ' ||
4348             old_rev[-1]  != ' ' ||
4349             new_rev[-1]  != ' ' ||
4350             status[-1]   != ' ')
4351                 return FALSE;
4352
4353         file->status = *status;
4354
4355         string_copy_rev(file->old.rev, old_rev);
4356         string_copy_rev(file->new.rev, new_rev);
4357
4358         file->old.mode = strtoul(old_mode, NULL, 8);
4359         file->new.mode = strtoul(new_mode, NULL, 8);
4360
4361         file->old.name[0] = file->new.name[0] = 0;
4362
4363         return TRUE;
4364 }
4365
4366 static bool
4367 status_run(struct view *view, const char *argv[], char status, enum line_type type)
4368 {
4369         struct status *file = NULL;
4370         struct status *unmerged = NULL;
4371         char *buf;
4372         struct io io = {};
4373
4374         if (!run_io(&io, argv, NULL, IO_RD))
4375                 return FALSE;
4376
4377         add_line_data(view, NULL, type);
4378
4379         while ((buf = io_get(&io, 0, TRUE))) {
4380                 if (!file) {
4381                         file = calloc(1, sizeof(*file));
4382                         if (!file || !add_line_data(view, file, type))
4383                                 goto error_out;
4384                 }
4385
4386                 /* Parse diff info part. */
4387                 if (status) {
4388                         file->status = status;
4389                         if (status == 'A')
4390                                 string_copy(file->old.rev, NULL_ID);
4391
4392                 } else if (!file->status) {
4393                         if (!status_get_diff(file, buf, strlen(buf)))
4394                                 goto error_out;
4395
4396                         buf = io_get(&io, 0, TRUE);
4397                         if (!buf)
4398                                 break;
4399
4400                         /* Collapse all 'M'odified entries that follow a
4401                          * associated 'U'nmerged entry. */
4402                         if (file->status == 'U') {
4403                                 unmerged = file;
4404
4405                         } else if (unmerged) {
4406                                 int collapse = !strcmp(buf, unmerged->new.name);
4407
4408                                 unmerged = NULL;
4409                                 if (collapse) {
4410                                         free(file);
4411                                         file = NULL;
4412                                         view->lines--;
4413                                         continue;
4414                                 }
4415                         }
4416                 }
4417
4418                 /* Grab the old name for rename/copy. */
4419                 if (!*file->old.name &&
4420                     (file->status == 'R' || file->status == 'C')) {
4421                         string_ncopy(file->old.name, buf, strlen(buf));
4422
4423                         buf = io_get(&io, 0, TRUE);
4424                         if (!buf)
4425                                 break;
4426                 }
4427
4428                 /* git-ls-files just delivers a NUL separated list of
4429                  * file names similar to the second half of the
4430                  * git-diff-* output. */
4431                 string_ncopy(file->new.name, buf, strlen(buf));
4432                 if (!*file->old.name)
4433                         string_copy(file->old.name, file->new.name);
4434                 file = NULL;
4435         }
4436
4437         if (io_error(&io)) {
4438 error_out:
4439                 done_io(&io);
4440                 return FALSE;
4441         }
4442
4443         if (!view->line[view->lines - 1].data)
4444                 add_line_data(view, NULL, LINE_STAT_NONE);
4445
4446         done_io(&io);
4447         return TRUE;
4448 }
4449
4450 /* Don't show unmerged entries in the staged section. */
4451 static const char *status_diff_index_argv[] = {
4452         "git", "diff-index", "-z", "--diff-filter=ACDMRTXB",
4453                              "--cached", "-M", "HEAD", NULL
4454 };
4455
4456 static const char *status_diff_files_argv[] = {
4457         "git", "diff-files", "-z", NULL
4458 };
4459
4460 static const char *status_list_other_argv[] = {
4461         "git", "ls-files", "-z", "--others", "--exclude-standard", NULL
4462 };
4463
4464 static const char *status_list_no_head_argv[] = {
4465         "git", "ls-files", "-z", "--cached", "--exclude-standard", NULL
4466 };
4467
4468 static const char *update_index_argv[] = {
4469         "git", "update-index", "-q", "--unmerged", "--refresh", NULL
4470 };
4471
4472 /* Restore the previous line number to stay in the context or select a
4473  * line with something that can be updated. */
4474 static void
4475 status_restore(struct view *view)
4476 {
4477         if (view->p_lineno >= view->lines)
4478                 view->p_lineno = view->lines - 1;
4479         while (view->p_lineno < view->lines && !view->line[view->p_lineno].data)
4480                 view->p_lineno++;
4481         while (view->p_lineno > 0 && !view->line[view->p_lineno].data)
4482                 view->p_lineno--;
4483
4484         /* If the above fails, always skip the "On branch" line. */
4485         if (view->p_lineno < view->lines)
4486                 view->lineno = view->p_lineno;
4487         else
4488                 view->lineno = 1;
4489
4490         if (view->lineno < view->offset)
4491                 view->offset = view->lineno;
4492         else if (view->offset + view->height <= view->lineno)
4493                 view->offset = view->lineno - view->height + 1;
4494
4495         view->p_restore = FALSE;
4496 }
4497
4498 /* First parse staged info using git-diff-index(1), then parse unstaged
4499  * info using git-diff-files(1), and finally untracked files using
4500  * git-ls-files(1). */
4501 static bool
4502 status_open(struct view *view)
4503 {
4504         reset_view(view);
4505
4506         add_line_data(view, NULL, LINE_STAT_HEAD);
4507         if (is_initial_commit())
4508                 string_copy(status_onbranch, "Initial commit");
4509         else if (!*opt_head)
4510                 string_copy(status_onbranch, "Not currently on any branch");
4511         else if (!string_format(status_onbranch, "On branch %s", opt_head))
4512                 return FALSE;
4513
4514         run_io_bg(update_index_argv);
4515
4516         if (is_initial_commit()) {
4517                 if (!status_run(view, status_list_no_head_argv, 'A', LINE_STAT_STAGED))
4518                         return FALSE;
4519         } else if (!status_run(view, status_diff_index_argv, 0, LINE_STAT_STAGED)) {
4520                 return FALSE;
4521         }
4522
4523         if (!status_run(view, status_diff_files_argv, 0, LINE_STAT_UNSTAGED) ||
4524             !status_run(view, status_list_other_argv, '?', LINE_STAT_UNTRACKED))
4525                 return FALSE;
4526
4527         /* Restore the exact position or use the specialized restore
4528          * mode? */
4529         if (!view->p_restore)
4530                 status_restore(view);
4531         return TRUE;
4532 }
4533
4534 static bool
4535 status_draw(struct view *view, struct line *line, unsigned int lineno)
4536 {
4537         struct status *status = line->data;
4538         enum line_type type;
4539         const char *text;
4540
4541         if (!status) {
4542                 switch (line->type) {
4543                 case LINE_STAT_STAGED:
4544                         type = LINE_STAT_SECTION;
4545                         text = "Changes to be committed:";
4546                         break;
4547
4548                 case LINE_STAT_UNSTAGED:
4549                         type = LINE_STAT_SECTION;
4550                         text = "Changed but not updated:";
4551                         break;
4552
4553                 case LINE_STAT_UNTRACKED:
4554                         type = LINE_STAT_SECTION;
4555                         text = "Untracked files:";
4556                         break;
4557
4558                 case LINE_STAT_NONE:
4559                         type = LINE_DEFAULT;
4560                         text = "    (no files)";
4561                         break;
4562
4563                 case LINE_STAT_HEAD:
4564                         type = LINE_STAT_HEAD;
4565                         text = status_onbranch;
4566                         break;
4567
4568                 default:
4569                         return FALSE;
4570                 }
4571         } else {
4572                 static char buf[] = { '?', ' ', ' ', ' ', 0 };
4573
4574                 buf[0] = status->status;
4575                 if (draw_text(view, line->type, buf, TRUE))
4576                         return TRUE;
4577                 type = LINE_DEFAULT;
4578                 text = status->new.name;
4579         }
4580
4581         draw_text(view, type, text, TRUE);
4582         return TRUE;
4583 }
4584
4585 static enum request
4586 status_enter(struct view *view, struct line *line)
4587 {
4588         struct status *status = line->data;
4589         const char *oldpath = status ? status->old.name : NULL;
4590         /* Diffs for unmerged entries are empty when passing the new
4591          * path, so leave it empty. */
4592         const char *newpath = status && status->status != 'U' ? status->new.name : NULL;
4593         const char *info;
4594         enum open_flags split;
4595         struct view *stage = VIEW(REQ_VIEW_STAGE);
4596
4597         if (line->type == LINE_STAT_NONE ||
4598             (!status && line[1].type == LINE_STAT_NONE)) {
4599                 report("No file to diff");
4600                 return REQ_NONE;
4601         }
4602
4603         switch (line->type) {
4604         case LINE_STAT_STAGED:
4605                 if (is_initial_commit()) {
4606                         const char *no_head_diff_argv[] = {
4607                                 "git", "diff", "--no-color", "--patch-with-stat",
4608                                         "--", "/dev/null", newpath, NULL
4609                         };
4610
4611                         if (!prepare_update(stage, no_head_diff_argv, opt_cdup, FORMAT_DASH))
4612                                 return REQ_QUIT;
4613                 } else {
4614                         const char *index_show_argv[] = {
4615                                 "git", "diff-index", "--root", "--patch-with-stat",
4616                                         "-C", "-M", "--cached", "HEAD", "--",
4617                                         oldpath, newpath, NULL
4618                         };
4619
4620                         if (!prepare_update(stage, index_show_argv, opt_cdup, FORMAT_DASH))
4621                                 return REQ_QUIT;
4622                 }
4623
4624                 if (status)
4625                         info = "Staged changes to %s";
4626                 else
4627                         info = "Staged changes";
4628                 break;
4629
4630         case LINE_STAT_UNSTAGED:
4631         {
4632                 const char *files_show_argv[] = {
4633                         "git", "diff-files", "--root", "--patch-with-stat",
4634                                 "-C", "-M", "--", oldpath, newpath, NULL
4635                 };
4636
4637                 if (!prepare_update(stage, files_show_argv, opt_cdup, FORMAT_DASH))
4638                         return REQ_QUIT;
4639                 if (status)
4640                         info = "Unstaged changes to %s";
4641                 else
4642                         info = "Unstaged changes";
4643                 break;
4644         }
4645         case LINE_STAT_UNTRACKED:
4646                 if (!newpath) {
4647                         report("No file to show");
4648                         return REQ_NONE;
4649                 }
4650
4651                 if (!suffixcmp(status->new.name, -1, "/")) {
4652                         report("Cannot display a directory");
4653                         return REQ_NONE;
4654                 }
4655
4656                 if (!prepare_update_file(stage, newpath))
4657                         return REQ_QUIT;
4658                 info = "Untracked file %s";
4659                 break;
4660
4661         case LINE_STAT_HEAD:
4662                 return REQ_NONE;
4663
4664         default:
4665                 die("line type %d not handled in switch", line->type);
4666         }
4667
4668         split = view_is_displayed(view) ? OPEN_SPLIT : 0;
4669         open_view(view, REQ_VIEW_STAGE, OPEN_PREPARED | split);
4670         if (view_is_displayed(VIEW(REQ_VIEW_STAGE))) {
4671                 if (status) {
4672                         stage_status = *status;
4673                 } else {
4674                         memset(&stage_status, 0, sizeof(stage_status));
4675                 }
4676
4677                 stage_line_type = line->type;
4678                 stage_chunks = 0;
4679                 string_format(VIEW(REQ_VIEW_STAGE)->ref, info, stage_status.new.name);
4680         }
4681
4682         return REQ_NONE;
4683 }
4684
4685 static bool
4686 status_exists(struct status *status, enum line_type type)
4687 {
4688         struct view *view = VIEW(REQ_VIEW_STATUS);
4689         unsigned long lineno;
4690
4691         for (lineno = 0; lineno < view->lines; lineno++) {
4692                 struct line *line = &view->line[lineno];
4693                 struct status *pos = line->data;
4694
4695                 if (line->type != type)
4696                         continue;
4697                 if (!pos && (!status || !status->status) && line[1].data) {
4698                         select_view_line(view, lineno);
4699                         return TRUE;
4700                 }
4701                 if (pos && !strcmp(status->new.name, pos->new.name)) {
4702                         select_view_line(view, lineno);
4703                         return TRUE;
4704                 }
4705         }
4706
4707         return FALSE;
4708 }
4709
4710
4711 static bool
4712 status_update_prepare(struct io *io, enum line_type type)
4713 {
4714         const char *staged_argv[] = {
4715                 "git", "update-index", "-z", "--index-info", NULL
4716         };
4717         const char *others_argv[] = {
4718                 "git", "update-index", "-z", "--add", "--remove", "--stdin", NULL
4719         };
4720
4721         switch (type) {
4722         case LINE_STAT_STAGED:
4723                 return run_io(io, staged_argv, opt_cdup, IO_WR);
4724
4725         case LINE_STAT_UNSTAGED:
4726                 return run_io(io, others_argv, opt_cdup, IO_WR);
4727
4728         case LINE_STAT_UNTRACKED:
4729                 return run_io(io, others_argv, NULL, IO_WR);
4730
4731         default:
4732                 die("line type %d not handled in switch", type);
4733                 return FALSE;
4734         }
4735 }
4736
4737 static bool
4738 status_update_write(struct io *io, struct status *status, enum line_type type)
4739 {
4740         char buf[SIZEOF_STR];
4741         size_t bufsize = 0;
4742
4743         switch (type) {
4744         case LINE_STAT_STAGED:
4745                 if (!string_format_from(buf, &bufsize, "%06o %s\t%s%c",
4746                                         status->old.mode,
4747                                         status->old.rev,
4748                                         status->old.name, 0))
4749                         return FALSE;
4750                 break;
4751
4752         case LINE_STAT_UNSTAGED:
4753         case LINE_STAT_UNTRACKED:
4754                 if (!string_format_from(buf, &bufsize, "%s%c", status->new.name, 0))
4755                         return FALSE;
4756                 break;
4757
4758         default:
4759                 die("line type %d not handled in switch", type);
4760         }
4761
4762         return io_write(io, buf, bufsize);
4763 }
4764
4765 static bool
4766 status_update_file(struct status *status, enum line_type type)
4767 {
4768         struct io io = {};
4769         bool result;
4770
4771         if (!status_update_prepare(&io, type))
4772                 return FALSE;
4773
4774         result = status_update_write(&io, status, type);
4775         done_io(&io);
4776         return result;
4777 }
4778
4779 static bool
4780 status_update_files(struct view *view, struct line *line)
4781 {
4782         struct io io = {};
4783         bool result = TRUE;
4784         struct line *pos = view->line + view->lines;
4785         int files = 0;
4786         int file, done;
4787
4788         if (!status_update_prepare(&io, line->type))
4789                 return FALSE;
4790
4791         for (pos = line; pos < view->line + view->lines && pos->data; pos++)
4792                 files++;
4793
4794         for (file = 0, done = 0; result && file < files; line++, file++) {
4795                 int almost_done = file * 100 / files;
4796