Replace opt_no_head with opt_head_rev in order to save the HEAD rev
[tig] / tig.c
1 /* Copyright (c) 2006-2008 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/stat.h>
36 #include <unistd.h>
37 #include <time.h>
38
39 #include <regex.h>
40
41 #include <locale.h>
42 #include <langinfo.h>
43 #include <iconv.h>
44
45 /* ncurses(3): Must be defined to have extended wide-character functions. */
46 #define _XOPEN_SOURCE_EXTENDED
47
48 #ifdef HAVE_NCURSESW_NCURSES_H
49 #include <ncursesw/ncurses.h>
50 #else
51 #ifdef HAVE_NCURSES_NCURSES_H
52 #include <ncurses/ncurses.h>
53 #else
54 #include <ncurses.h>
55 #endif
56 #endif
57
58 #if __GNUC__ >= 3
59 #define __NORETURN __attribute__((__noreturn__))
60 #else
61 #define __NORETURN
62 #endif
63
64 static void __NORETURN die(const char *err, ...);
65 static void warn(const char *msg, ...);
66 static void report(const char *msg, ...);
67 static int read_properties(FILE *pipe, const char *separators, int (*read)(char *, size_t, char *, size_t));
68 static void set_nonblocking_input(bool loading);
69 static size_t utf8_length(const char *string, int *width, size_t max_width, int *trimmed, bool reserve);
70 static bool prompt_yesno(const char *prompt);
71 static int load_refs(void);
72
73 #define ABS(x)          ((x) >= 0  ? (x) : -(x))
74 #define MIN(x, y)       ((x) < (y) ? (x) :  (y))
75
76 #define ARRAY_SIZE(x)   (sizeof(x) / sizeof(x[0]))
77 #define STRING_SIZE(x)  (sizeof(x) - 1)
78
79 #define SIZEOF_STR      1024    /* Default string size. */
80 #define SIZEOF_REF      256     /* Size of symbolic or SHA1 ID. */
81 #define SIZEOF_REV      41      /* Holds a SHA-1 and an ending NUL. */
82 #define SIZEOF_ARG      32      /* Default argument array size. */
83
84 /* Revision graph */
85
86 #define REVGRAPH_INIT   'I'
87 #define REVGRAPH_MERGE  'M'
88 #define REVGRAPH_BRANCH '+'
89 #define REVGRAPH_COMMIT '*'
90 #define REVGRAPH_BOUND  '^'
91
92 #define SIZEOF_REVGRAPH 19      /* Size of revision ancestry graphics. */
93
94 /* This color name can be used to refer to the default term colors. */
95 #define COLOR_DEFAULT   (-1)
96
97 #define ICONV_NONE      ((iconv_t) -1)
98 #ifndef ICONV_CONST
99 #define ICONV_CONST     /* nothing */
100 #endif
101
102 /* The format and size of the date column in the main view. */
103 #define DATE_FORMAT     "%Y-%m-%d %H:%M"
104 #define DATE_COLS       STRING_SIZE("2006-04-29 14:21 ")
105
106 #define AUTHOR_COLS     20
107 #define ID_COLS         8
108
109 /* The default interval between line numbers. */
110 #define NUMBER_INTERVAL 5
111
112 #define TAB_SIZE        8
113
114 #define SCALE_SPLIT_VIEW(height)        ((height) * 2 / 3)
115
116 #define NULL_ID         "0000000000000000000000000000000000000000"
117
118 #ifndef GIT_CONFIG
119 #define GIT_CONFIG "config"
120 #endif
121
122 #define TIG_LS_REMOTE \
123         "git ls-remote . 2>/dev/null"
124
125 #define TIG_DIFF_CMD \
126         "git show --pretty=fuller --no-color --root --patch-with-stat --find-copies-harder -C %s 2>/dev/null"
127
128 #define TIG_LOG_CMD     \
129         "git log --no-color --cc --stat -n100 %s 2>/dev/null"
130
131 #define TIG_MAIN_BASE \
132         "git log --no-color --pretty=raw --parents --topo-order"
133
134 #define TIG_MAIN_CMD \
135         TIG_MAIN_BASE " %s 2>/dev/null"
136
137 #define TIG_TREE_CMD    \
138         "git ls-tree %s %s"
139
140 #define TIG_BLOB_CMD    \
141         "git cat-file blob %s"
142
143 /* XXX: Needs to be defined to the empty string. */
144 #define TIG_HELP_CMD    ""
145 #define TIG_PAGER_CMD   ""
146 #define TIG_STATUS_CMD  ""
147 #define TIG_STAGE_CMD   ""
148 #define TIG_BLAME_CMD   ""
149
150 /* Some ascii-shorthands fitted into the ncurses namespace. */
151 #define KEY_TAB         '\t'
152 #define KEY_RETURN      '\r'
153 #define KEY_ESC         27
154
155
156 struct ref {
157         char *name;             /* Ref name; tag or head names are shortened. */
158         char id[SIZEOF_REV];    /* Commit SHA1 ID */
159         unsigned int head:1;    /* Is it the current HEAD? */
160         unsigned int tag:1;     /* Is it a tag? */
161         unsigned int ltag:1;    /* If so, is the tag local? */
162         unsigned int remote:1;  /* Is it a remote ref? */
163         unsigned int tracked:1; /* Is it the remote for the current HEAD? */
164         unsigned int next:1;    /* For ref lists: are there more refs? */
165 };
166
167 static struct ref **get_refs(const char *id);
168
169 struct int_map {
170         const char *name;
171         int namelen;
172         int value;
173 };
174
175 static int
176 set_from_int_map(struct int_map *map, size_t map_size,
177                  int *value, const char *name, int namelen)
178 {
179
180         int i;
181
182         for (i = 0; i < map_size; i++)
183                 if (namelen == map[i].namelen &&
184                     !strncasecmp(name, map[i].name, namelen)) {
185                         *value = map[i].value;
186                         return OK;
187                 }
188
189         return ERR;
190 }
191
192
193 /*
194  * String helpers
195  */
196
197 static inline void
198 string_ncopy_do(char *dst, size_t dstlen, const char *src, size_t srclen)
199 {
200         if (srclen > dstlen - 1)
201                 srclen = dstlen - 1;
202
203         strncpy(dst, src, srclen);
204         dst[srclen] = 0;
205 }
206
207 /* Shorthands for safely copying into a fixed buffer. */
208
209 #define string_copy(dst, src) \
210         string_ncopy_do(dst, sizeof(dst), src, sizeof(src))
211
212 #define string_ncopy(dst, src, srclen) \
213         string_ncopy_do(dst, sizeof(dst), src, srclen)
214
215 #define string_copy_rev(dst, src) \
216         string_ncopy_do(dst, SIZEOF_REV, src, SIZEOF_REV - 1)
217
218 #define string_add(dst, from, src) \
219         string_ncopy_do(dst + (from), sizeof(dst) - (from), src, sizeof(src))
220
221 static char *
222 chomp_string(char *name)
223 {
224         int namelen;
225
226         while (isspace(*name))
227                 name++;
228
229         namelen = strlen(name) - 1;
230         while (namelen > 0 && isspace(name[namelen]))
231                 name[namelen--] = 0;
232
233         return name;
234 }
235
236 static bool
237 string_nformat(char *buf, size_t bufsize, size_t *bufpos, const char *fmt, ...)
238 {
239         va_list args;
240         size_t pos = bufpos ? *bufpos : 0;
241
242         va_start(args, fmt);
243         pos += vsnprintf(buf + pos, bufsize - pos, fmt, args);
244         va_end(args);
245
246         if (bufpos)
247                 *bufpos = pos;
248
249         return pos >= bufsize ? FALSE : TRUE;
250 }
251
252 #define string_format(buf, fmt, args...) \
253         string_nformat(buf, sizeof(buf), NULL, fmt, args)
254
255 #define string_format_from(buf, from, fmt, args...) \
256         string_nformat(buf, sizeof(buf), from, fmt, args)
257
258 static int
259 string_enum_compare(const char *str1, const char *str2, int len)
260 {
261         size_t i;
262
263 #define string_enum_sep(x) ((x) == '-' || (x) == '_' || (x) == '.')
264
265         /* Diff-Header == DIFF_HEADER */
266         for (i = 0; i < len; i++) {
267                 if (toupper(str1[i]) == toupper(str2[i]))
268                         continue;
269
270                 if (string_enum_sep(str1[i]) &&
271                     string_enum_sep(str2[i]))
272                         continue;
273
274                 return str1[i] - str2[i];
275         }
276
277         return 0;
278 }
279
280 #define prefixcmp(str1, str2) \
281         strncmp(str1, str2, STRING_SIZE(str2))
282
283 static inline int
284 suffixcmp(const char *str, int slen, const char *suffix)
285 {
286         size_t len = slen >= 0 ? slen : strlen(str);
287         size_t suffixlen = strlen(suffix);
288
289         return suffixlen < len ? strcmp(str + len - suffixlen, suffix) : -1;
290 }
291
292 /* Shell quoting
293  *
294  * NOTE: The following is a slightly modified copy of the git project's shell
295  * quoting routines found in the quote.c file.
296  *
297  * Help to copy the thing properly quoted for the shell safety.  any single
298  * quote is replaced with '\'', any exclamation point is replaced with '\!',
299  * and the whole thing is enclosed in a
300  *
301  * E.g.
302  *  original     sq_quote     result
303  *  name     ==> name      ==> 'name'
304  *  a b      ==> a b       ==> 'a b'
305  *  a'b      ==> a'\''b    ==> 'a'\''b'
306  *  a!b      ==> a'\!'b    ==> 'a'\!'b'
307  */
308
309 static size_t
310 sq_quote(char buf[SIZEOF_STR], size_t bufsize, const char *src)
311 {
312         char c;
313
314 #define BUFPUT(x) do { if (bufsize < SIZEOF_STR) buf[bufsize++] = (x); } while (0)
315
316         BUFPUT('\'');
317         while ((c = *src++)) {
318                 if (c == '\'' || c == '!') {
319                         BUFPUT('\'');
320                         BUFPUT('\\');
321                         BUFPUT(c);
322                         BUFPUT('\'');
323                 } else {
324                         BUFPUT(c);
325                 }
326         }
327         BUFPUT('\'');
328
329         if (bufsize < SIZEOF_STR)
330                 buf[bufsize] = 0;
331
332         return bufsize;
333 }
334
335
336 /*
337  * User requests
338  */
339
340 #define REQ_INFO \
341         /* XXX: Keep the view request first and in sync with views[]. */ \
342         REQ_GROUP("View switching") \
343         REQ_(VIEW_MAIN,         "Show main view"), \
344         REQ_(VIEW_DIFF,         "Show diff view"), \
345         REQ_(VIEW_LOG,          "Show log view"), \
346         REQ_(VIEW_TREE,         "Show tree view"), \
347         REQ_(VIEW_BLOB,         "Show blob view"), \
348         REQ_(VIEW_BLAME,        "Show blame view"), \
349         REQ_(VIEW_HELP,         "Show help page"), \
350         REQ_(VIEW_PAGER,        "Show pager view"), \
351         REQ_(VIEW_STATUS,       "Show status view"), \
352         REQ_(VIEW_STAGE,        "Show stage view"), \
353         \
354         REQ_GROUP("View manipulation") \
355         REQ_(ENTER,             "Enter current line and scroll"), \
356         REQ_(NEXT,              "Move to next"), \
357         REQ_(PREVIOUS,          "Move to previous"), \
358         REQ_(VIEW_NEXT,         "Move focus to next view"), \
359         REQ_(REFRESH,           "Reload and refresh"), \
360         REQ_(MAXIMIZE,          "Maximize the current view"), \
361         REQ_(VIEW_CLOSE,        "Close the current view"), \
362         REQ_(QUIT,              "Close all views and quit"), \
363         \
364         REQ_GROUP("View specific requests") \
365         REQ_(STATUS_UPDATE,     "Update file status"), \
366         REQ_(STATUS_REVERT,     "Revert file changes"), \
367         REQ_(STATUS_MERGE,      "Merge file using external tool"), \
368         REQ_(STAGE_NEXT,        "Find next chunk to stage"), \
369         REQ_(TREE_PARENT,       "Switch to parent directory in tree view"), \
370         \
371         REQ_GROUP("Cursor navigation") \
372         REQ_(MOVE_UP,           "Move cursor one line up"), \
373         REQ_(MOVE_DOWN,         "Move cursor one line down"), \
374         REQ_(MOVE_PAGE_DOWN,    "Move cursor one page down"), \
375         REQ_(MOVE_PAGE_UP,      "Move cursor one page up"), \
376         REQ_(MOVE_FIRST_LINE,   "Move cursor to first line"), \
377         REQ_(MOVE_LAST_LINE,    "Move cursor to last line"), \
378         \
379         REQ_GROUP("Scrolling") \
380         REQ_(SCROLL_LINE_UP,    "Scroll one line up"), \
381         REQ_(SCROLL_LINE_DOWN,  "Scroll one line down"), \
382         REQ_(SCROLL_PAGE_UP,    "Scroll one page up"), \
383         REQ_(SCROLL_PAGE_DOWN,  "Scroll one page down"), \
384         \
385         REQ_GROUP("Searching") \
386         REQ_(SEARCH,            "Search the view"), \
387         REQ_(SEARCH_BACK,       "Search backwards in the view"), \
388         REQ_(FIND_NEXT,         "Find next search match"), \
389         REQ_(FIND_PREV,         "Find previous search match"), \
390         \
391         REQ_GROUP("Option manipulation") \
392         REQ_(TOGGLE_LINENO,     "Toggle line numbers"), \
393         REQ_(TOGGLE_DATE,       "Toggle date display"), \
394         REQ_(TOGGLE_AUTHOR,     "Toggle author display"), \
395         REQ_(TOGGLE_REV_GRAPH,  "Toggle revision graph visualization"), \
396         REQ_(TOGGLE_REFS,       "Toggle reference display (tags/branches)"), \
397         \
398         REQ_GROUP("Misc") \
399         REQ_(PROMPT,            "Bring up the prompt"), \
400         REQ_(SCREEN_REDRAW,     "Redraw the screen"), \
401         REQ_(SCREEN_RESIZE,     "Resize the screen"), \
402         REQ_(SHOW_VERSION,      "Show version information"), \
403         REQ_(STOP_LOADING,      "Stop all loading views"), \
404         REQ_(EDIT,              "Open in editor"), \
405         REQ_(NONE,              "Do nothing")
406
407
408 /* User action requests. */
409 enum request {
410 #define REQ_GROUP(help)
411 #define REQ_(req, help) REQ_##req
412
413         /* Offset all requests to avoid conflicts with ncurses getch values. */
414         REQ_OFFSET = KEY_MAX + 1,
415         REQ_INFO
416
417 #undef  REQ_GROUP
418 #undef  REQ_
419 };
420
421 struct request_info {
422         enum request request;
423         const char *name;
424         int namelen;
425         const char *help;
426 };
427
428 static struct request_info req_info[] = {
429 #define REQ_GROUP(help) { 0, NULL, 0, (help) },
430 #define REQ_(req, help) { REQ_##req, (#req), STRING_SIZE(#req), (help) }
431         REQ_INFO
432 #undef  REQ_GROUP
433 #undef  REQ_
434 };
435
436 static enum request
437 get_request(const char *name)
438 {
439         int namelen = strlen(name);
440         int i;
441
442         for (i = 0; i < ARRAY_SIZE(req_info); i++)
443                 if (req_info[i].namelen == namelen &&
444                     !string_enum_compare(req_info[i].name, name, namelen))
445                         return req_info[i].request;
446
447         return REQ_NONE;
448 }
449
450
451 /*
452  * Options
453  */
454
455 static const char usage[] =
456 "tig " TIG_VERSION " (" __DATE__ ")\n"
457 "\n"
458 "Usage: tig        [options] [revs] [--] [paths]\n"
459 "   or: tig show   [options] [revs] [--] [paths]\n"
460 "   or: tig blame  [rev] path\n"
461 "   or: tig status\n"
462 "   or: tig <      [git command output]\n"
463 "\n"
464 "Options:\n"
465 "  -v, --version   Show version and exit\n"
466 "  -h, --help      Show help message and exit";
467
468 /* Option and state variables. */
469 static bool opt_date                    = TRUE;
470 static bool opt_author                  = TRUE;
471 static bool opt_line_number             = FALSE;
472 static bool opt_line_graphics           = TRUE;
473 static bool opt_rev_graph               = FALSE;
474 static bool opt_show_refs               = TRUE;
475 static int opt_num_interval             = NUMBER_INTERVAL;
476 static int opt_tab_size                 = TAB_SIZE;
477 static int opt_author_cols              = AUTHOR_COLS-1;
478 static char opt_cmd[SIZEOF_STR]         = "";
479 static char opt_path[SIZEOF_STR]        = "";
480 static char opt_file[SIZEOF_STR]        = "";
481 static char opt_ref[SIZEOF_REF]         = "";
482 static char opt_head[SIZEOF_REF]        = "";
483 static char opt_head_rev[SIZEOF_REV]    = "";
484 static char opt_remote[SIZEOF_REF]      = "";
485 static FILE *opt_pipe                   = NULL;
486 static char opt_encoding[20]            = "UTF-8";
487 static bool opt_utf8                    = TRUE;
488 static char opt_codeset[20]             = "UTF-8";
489 static iconv_t opt_iconv                = ICONV_NONE;
490 static char opt_search[SIZEOF_STR]      = "";
491 static char opt_cdup[SIZEOF_STR]        = "";
492 static char opt_git_dir[SIZEOF_STR]     = "";
493 static signed char opt_is_inside_work_tree      = -1; /* set to TRUE or FALSE */
494 static char opt_editor[SIZEOF_STR]      = "";
495 static FILE *opt_tty                    = NULL;
496
497 #define is_initial_commit()     (!*opt_head_rev)
498
499 static enum request
500 parse_options(int argc, const char *argv[])
501 {
502         enum request request = REQ_VIEW_MAIN;
503         size_t buf_size;
504         const char *subcommand;
505         bool seen_dashdash = FALSE;
506         int i;
507
508         if (!isatty(STDIN_FILENO)) {
509                 opt_pipe = stdin;
510                 return REQ_VIEW_PAGER;
511         }
512
513         if (argc <= 1)
514                 return REQ_VIEW_MAIN;
515
516         subcommand = argv[1];
517         if (!strcmp(subcommand, "status") || !strcmp(subcommand, "-S")) {
518                 if (!strcmp(subcommand, "-S"))
519                         warn("`-S' has been deprecated; use `tig status' instead");
520                 if (argc > 2)
521                         warn("ignoring arguments after `%s'", subcommand);
522                 return REQ_VIEW_STATUS;
523
524         } else if (!strcmp(subcommand, "blame")) {
525                 if (argc <= 2 || argc > 4)
526                         die("invalid number of options to blame\n\n%s", usage);
527
528                 i = 2;
529                 if (argc == 4) {
530                         string_ncopy(opt_ref, argv[i], strlen(argv[i]));
531                         i++;
532                 }
533
534                 string_ncopy(opt_file, argv[i], strlen(argv[i]));
535                 return REQ_VIEW_BLAME;
536
537         } else if (!strcmp(subcommand, "show")) {
538                 request = REQ_VIEW_DIFF;
539
540         } else if (!strcmp(subcommand, "log") || !strcmp(subcommand, "diff")) {
541                 request = subcommand[0] == 'l' ? REQ_VIEW_LOG : REQ_VIEW_DIFF;
542                 warn("`tig %s' has been deprecated", subcommand);
543
544         } else {
545                 subcommand = NULL;
546         }
547
548         if (!subcommand)
549                 /* XXX: This is vulnerable to the user overriding
550                  * options required for the main view parser. */
551                 string_copy(opt_cmd, TIG_MAIN_BASE);
552         else
553                 string_format(opt_cmd, "git %s", subcommand);
554
555         buf_size = strlen(opt_cmd);
556
557         for (i = 1 + !!subcommand; i < argc; i++) {
558                 const char *opt = argv[i];
559
560                 if (seen_dashdash || !strcmp(opt, "--")) {
561                         seen_dashdash = TRUE;
562
563                 } else if (!strcmp(opt, "-v") || !strcmp(opt, "--version")) {
564                         printf("tig version %s\n", TIG_VERSION);
565                         return REQ_NONE;
566
567                 } else if (!strcmp(opt, "-h") || !strcmp(opt, "--help")) {
568                         printf("%s\n", usage);
569                         return REQ_NONE;
570                 }
571
572                 opt_cmd[buf_size++] = ' ';
573                 buf_size = sq_quote(opt_cmd, buf_size, opt);
574                 if (buf_size >= sizeof(opt_cmd))
575                         die("command too long");
576         }
577
578         opt_cmd[buf_size] = 0;
579
580         return request;
581 }
582
583
584 /*
585  * Line-oriented content detection.
586  */
587
588 #define LINE_INFO \
589 LINE(DIFF_HEADER,  "diff --git ",       COLOR_YELLOW,   COLOR_DEFAULT,  0), \
590 LINE(DIFF_CHUNK,   "@@",                COLOR_MAGENTA,  COLOR_DEFAULT,  0), \
591 LINE(DIFF_ADD,     "+",                 COLOR_GREEN,    COLOR_DEFAULT,  0), \
592 LINE(DIFF_DEL,     "-",                 COLOR_RED,      COLOR_DEFAULT,  0), \
593 LINE(DIFF_INDEX,        "index ",         COLOR_BLUE,   COLOR_DEFAULT,  0), \
594 LINE(DIFF_OLDMODE,      "old file mode ", COLOR_YELLOW, COLOR_DEFAULT,  0), \
595 LINE(DIFF_NEWMODE,      "new file mode ", COLOR_YELLOW, COLOR_DEFAULT,  0), \
596 LINE(DIFF_COPY_FROM,    "copy from",      COLOR_YELLOW, COLOR_DEFAULT,  0), \
597 LINE(DIFF_COPY_TO,      "copy to",        COLOR_YELLOW, COLOR_DEFAULT,  0), \
598 LINE(DIFF_RENAME_FROM,  "rename from",    COLOR_YELLOW, COLOR_DEFAULT,  0), \
599 LINE(DIFF_RENAME_TO,    "rename to",      COLOR_YELLOW, COLOR_DEFAULT,  0), \
600 LINE(DIFF_SIMILARITY,   "similarity ",    COLOR_YELLOW, COLOR_DEFAULT,  0), \
601 LINE(DIFF_DISSIMILARITY,"dissimilarity ", COLOR_YELLOW, COLOR_DEFAULT,  0), \
602 LINE(DIFF_TREE,         "diff-tree ",     COLOR_BLUE,   COLOR_DEFAULT,  0), \
603 LINE(PP_AUTHOR,    "Author: ",          COLOR_CYAN,     COLOR_DEFAULT,  0), \
604 LINE(PP_COMMIT,    "Commit: ",          COLOR_MAGENTA,  COLOR_DEFAULT,  0), \
605 LINE(PP_MERGE,     "Merge: ",           COLOR_BLUE,     COLOR_DEFAULT,  0), \
606 LINE(PP_DATE,      "Date:   ",          COLOR_YELLOW,   COLOR_DEFAULT,  0), \
607 LINE(PP_ADATE,     "AuthorDate: ",      COLOR_YELLOW,   COLOR_DEFAULT,  0), \
608 LINE(PP_CDATE,     "CommitDate: ",      COLOR_YELLOW,   COLOR_DEFAULT,  0), \
609 LINE(PP_REFS,      "Refs: ",            COLOR_RED,      COLOR_DEFAULT,  0), \
610 LINE(COMMIT,       "commit ",           COLOR_GREEN,    COLOR_DEFAULT,  0), \
611 LINE(PARENT,       "parent ",           COLOR_BLUE,     COLOR_DEFAULT,  0), \
612 LINE(TREE,         "tree ",             COLOR_BLUE,     COLOR_DEFAULT,  0), \
613 LINE(AUTHOR,       "author ",           COLOR_CYAN,     COLOR_DEFAULT,  0), \
614 LINE(COMMITTER,    "committer ",        COLOR_MAGENTA,  COLOR_DEFAULT,  0), \
615 LINE(SIGNOFF,      "    Signed-off-by", COLOR_YELLOW,   COLOR_DEFAULT,  0), \
616 LINE(ACKED,        "    Acked-by",      COLOR_YELLOW,   COLOR_DEFAULT,  0), \
617 LINE(DEFAULT,      "",                  COLOR_DEFAULT,  COLOR_DEFAULT,  A_NORMAL), \
618 LINE(CURSOR,       "",                  COLOR_WHITE,    COLOR_GREEN,    A_BOLD), \
619 LINE(STATUS,       "",                  COLOR_GREEN,    COLOR_DEFAULT,  0), \
620 LINE(DELIMITER,    "",                  COLOR_MAGENTA,  COLOR_DEFAULT,  0), \
621 LINE(DATE,         "",                  COLOR_BLUE,     COLOR_DEFAULT,  0), \
622 LINE(LINE_NUMBER,  "",                  COLOR_CYAN,     COLOR_DEFAULT,  0), \
623 LINE(TITLE_BLUR,   "",                  COLOR_WHITE,    COLOR_BLUE,     0), \
624 LINE(TITLE_FOCUS,  "",                  COLOR_WHITE,    COLOR_BLUE,     A_BOLD), \
625 LINE(MAIN_AUTHOR,  "",                  COLOR_GREEN,    COLOR_DEFAULT,  0), \
626 LINE(MAIN_COMMIT,  "",                  COLOR_DEFAULT,  COLOR_DEFAULT,  0), \
627 LINE(MAIN_TAG,     "",                  COLOR_MAGENTA,  COLOR_DEFAULT,  A_BOLD), \
628 LINE(MAIN_LOCAL_TAG,"",                 COLOR_MAGENTA,  COLOR_DEFAULT,  0), \
629 LINE(MAIN_REMOTE,  "",                  COLOR_YELLOW,   COLOR_DEFAULT,  0), \
630 LINE(MAIN_TRACKED, "",                  COLOR_YELLOW,   COLOR_DEFAULT,  A_BOLD), \
631 LINE(MAIN_REF,     "",                  COLOR_CYAN,     COLOR_DEFAULT,  0), \
632 LINE(MAIN_HEAD,    "",                  COLOR_CYAN,     COLOR_DEFAULT,  A_BOLD), \
633 LINE(MAIN_REVGRAPH,"",                  COLOR_MAGENTA,  COLOR_DEFAULT,  0), \
634 LINE(TREE_DIR,     "",                  COLOR_DEFAULT,  COLOR_DEFAULT,  A_NORMAL), \
635 LINE(TREE_FILE,    "",                  COLOR_DEFAULT,  COLOR_DEFAULT,  A_NORMAL), \
636 LINE(STAT_HEAD,    "",                  COLOR_YELLOW,   COLOR_DEFAULT,  0), \
637 LINE(STAT_SECTION, "",                  COLOR_CYAN,     COLOR_DEFAULT,  0), \
638 LINE(STAT_NONE,    "",                  COLOR_DEFAULT,  COLOR_DEFAULT,  0), \
639 LINE(STAT_STAGED,  "",                  COLOR_MAGENTA,  COLOR_DEFAULT,  0), \
640 LINE(STAT_UNSTAGED,"",                  COLOR_MAGENTA,  COLOR_DEFAULT,  0), \
641 LINE(STAT_UNTRACKED,"",                 COLOR_MAGENTA,  COLOR_DEFAULT,  0), \
642 LINE(BLAME_ID,     "",                  COLOR_MAGENTA,  COLOR_DEFAULT,  0)
643
644 enum line_type {
645 #define LINE(type, line, fg, bg, attr) \
646         LINE_##type
647         LINE_INFO,
648         LINE_NONE
649 #undef  LINE
650 };
651
652 struct line_info {
653         const char *name;       /* Option name. */
654         int namelen;            /* Size of option name. */
655         const char *line;       /* The start of line to match. */
656         int linelen;            /* Size of string to match. */
657         int fg, bg, attr;       /* Color and text attributes for the lines. */
658 };
659
660 static struct line_info line_info[] = {
661 #define LINE(type, line, fg, bg, attr) \
662         { #type, STRING_SIZE(#type), (line), STRING_SIZE(line), (fg), (bg), (attr) }
663         LINE_INFO
664 #undef  LINE
665 };
666
667 static enum line_type
668 get_line_type(const char *line)
669 {
670         int linelen = strlen(line);
671         enum line_type type;
672
673         for (type = 0; type < ARRAY_SIZE(line_info); type++)
674                 /* Case insensitive search matches Signed-off-by lines better. */
675                 if (linelen >= line_info[type].linelen &&
676                     !strncasecmp(line_info[type].line, line, line_info[type].linelen))
677                         return type;
678
679         return LINE_DEFAULT;
680 }
681
682 static inline int
683 get_line_attr(enum line_type type)
684 {
685         assert(type < ARRAY_SIZE(line_info));
686         return COLOR_PAIR(type) | line_info[type].attr;
687 }
688
689 static struct line_info *
690 get_line_info(const char *name)
691 {
692         size_t namelen = strlen(name);
693         enum line_type type;
694
695         for (type = 0; type < ARRAY_SIZE(line_info); type++)
696                 if (namelen == line_info[type].namelen &&
697                     !string_enum_compare(line_info[type].name, name, namelen))
698                         return &line_info[type];
699
700         return NULL;
701 }
702
703 static void
704 init_colors(void)
705 {
706         int default_bg = line_info[LINE_DEFAULT].bg;
707         int default_fg = line_info[LINE_DEFAULT].fg;
708         enum line_type type;
709
710         start_color();
711
712         if (assume_default_colors(default_fg, default_bg) == ERR) {
713                 default_bg = COLOR_BLACK;
714                 default_fg = COLOR_WHITE;
715         }
716
717         for (type = 0; type < ARRAY_SIZE(line_info); type++) {
718                 struct line_info *info = &line_info[type];
719                 int bg = info->bg == COLOR_DEFAULT ? default_bg : info->bg;
720                 int fg = info->fg == COLOR_DEFAULT ? default_fg : info->fg;
721
722                 init_pair(type, fg, bg);
723         }
724 }
725
726 struct line {
727         enum line_type type;
728
729         /* State flags */
730         unsigned int selected:1;
731         unsigned int dirty:1;
732
733         void *data;             /* User data */
734 };
735
736
737 /*
738  * Keys
739  */
740
741 struct keybinding {
742         int alias;
743         enum request request;
744         struct keybinding *next;
745 };
746
747 static struct keybinding default_keybindings[] = {
748         /* View switching */
749         { 'm',          REQ_VIEW_MAIN },
750         { 'd',          REQ_VIEW_DIFF },
751         { 'l',          REQ_VIEW_LOG },
752         { 't',          REQ_VIEW_TREE },
753         { 'f',          REQ_VIEW_BLOB },
754         { 'B',          REQ_VIEW_BLAME },
755         { 'p',          REQ_VIEW_PAGER },
756         { 'h',          REQ_VIEW_HELP },
757         { 'S',          REQ_VIEW_STATUS },
758         { 'c',          REQ_VIEW_STAGE },
759
760         /* View manipulation */
761         { 'q',          REQ_VIEW_CLOSE },
762         { KEY_TAB,      REQ_VIEW_NEXT },
763         { KEY_RETURN,   REQ_ENTER },
764         { KEY_UP,       REQ_PREVIOUS },
765         { KEY_DOWN,     REQ_NEXT },
766         { 'R',          REQ_REFRESH },
767         { KEY_F(5),     REQ_REFRESH },
768         { 'O',          REQ_MAXIMIZE },
769
770         /* Cursor navigation */
771         { 'k',          REQ_MOVE_UP },
772         { 'j',          REQ_MOVE_DOWN },
773         { KEY_HOME,     REQ_MOVE_FIRST_LINE },
774         { KEY_END,      REQ_MOVE_LAST_LINE },
775         { KEY_NPAGE,    REQ_MOVE_PAGE_DOWN },
776         { ' ',          REQ_MOVE_PAGE_DOWN },
777         { KEY_PPAGE,    REQ_MOVE_PAGE_UP },
778         { 'b',          REQ_MOVE_PAGE_UP },
779         { '-',          REQ_MOVE_PAGE_UP },
780
781         /* Scrolling */
782         { KEY_IC,       REQ_SCROLL_LINE_UP },
783         { KEY_DC,       REQ_SCROLL_LINE_DOWN },
784         { 'w',          REQ_SCROLL_PAGE_UP },
785         { 's',          REQ_SCROLL_PAGE_DOWN },
786
787         /* Searching */
788         { '/',          REQ_SEARCH },
789         { '?',          REQ_SEARCH_BACK },
790         { 'n',          REQ_FIND_NEXT },
791         { 'N',          REQ_FIND_PREV },
792
793         /* Misc */
794         { 'Q',          REQ_QUIT },
795         { 'z',          REQ_STOP_LOADING },
796         { 'v',          REQ_SHOW_VERSION },
797         { 'r',          REQ_SCREEN_REDRAW },
798         { '.',          REQ_TOGGLE_LINENO },
799         { 'D',          REQ_TOGGLE_DATE },
800         { 'A',          REQ_TOGGLE_AUTHOR },
801         { 'g',          REQ_TOGGLE_REV_GRAPH },
802         { 'F',          REQ_TOGGLE_REFS },
803         { ':',          REQ_PROMPT },
804         { 'u',          REQ_STATUS_UPDATE },
805         { '!',          REQ_STATUS_REVERT },
806         { 'M',          REQ_STATUS_MERGE },
807         { '@',          REQ_STAGE_NEXT },
808         { ',',          REQ_TREE_PARENT },
809         { 'e',          REQ_EDIT },
810
811         /* Using the ncurses SIGWINCH handler. */
812         { KEY_RESIZE,   REQ_SCREEN_RESIZE },
813 };
814
815 #define KEYMAP_INFO \
816         KEYMAP_(GENERIC), \
817         KEYMAP_(MAIN), \
818         KEYMAP_(DIFF), \
819         KEYMAP_(LOG), \
820         KEYMAP_(TREE), \
821         KEYMAP_(BLOB), \
822         KEYMAP_(BLAME), \
823         KEYMAP_(PAGER), \
824         KEYMAP_(HELP), \
825         KEYMAP_(STATUS), \
826         KEYMAP_(STAGE)
827
828 enum keymap {
829 #define KEYMAP_(name) KEYMAP_##name
830         KEYMAP_INFO
831 #undef  KEYMAP_
832 };
833
834 static struct int_map keymap_table[] = {
835 #define KEYMAP_(name) { #name, STRING_SIZE(#name), KEYMAP_##name }
836         KEYMAP_INFO
837 #undef  KEYMAP_
838 };
839
840 #define set_keymap(map, name) \
841         set_from_int_map(keymap_table, ARRAY_SIZE(keymap_table), map, name, strlen(name))
842
843 static struct keybinding *keybindings[ARRAY_SIZE(keymap_table)];
844
845 static void
846 add_keybinding(enum keymap keymap, enum request request, int key)
847 {
848         struct keybinding *keybinding;
849
850         keybinding = calloc(1, sizeof(*keybinding));
851         if (!keybinding)
852                 die("Failed to allocate keybinding");
853
854         keybinding->alias = key;
855         keybinding->request = request;
856         keybinding->next = keybindings[keymap];
857         keybindings[keymap] = keybinding;
858 }
859
860 /* Looks for a key binding first in the given map, then in the generic map, and
861  * lastly in the default keybindings. */
862 static enum request
863 get_keybinding(enum keymap keymap, int key)
864 {
865         struct keybinding *kbd;
866         int i;
867
868         for (kbd = keybindings[keymap]; kbd; kbd = kbd->next)
869                 if (kbd->alias == key)
870                         return kbd->request;
871
872         for (kbd = keybindings[KEYMAP_GENERIC]; kbd; kbd = kbd->next)
873                 if (kbd->alias == key)
874                         return kbd->request;
875
876         for (i = 0; i < ARRAY_SIZE(default_keybindings); i++)
877                 if (default_keybindings[i].alias == key)
878                         return default_keybindings[i].request;
879
880         return (enum request) key;
881 }
882
883
884 struct key {
885         const char *name;
886         int value;
887 };
888
889 static struct key key_table[] = {
890         { "Enter",      KEY_RETURN },
891         { "Space",      ' ' },
892         { "Backspace",  KEY_BACKSPACE },
893         { "Tab",        KEY_TAB },
894         { "Escape",     KEY_ESC },
895         { "Left",       KEY_LEFT },
896         { "Right",      KEY_RIGHT },
897         { "Up",         KEY_UP },
898         { "Down",       KEY_DOWN },
899         { "Insert",     KEY_IC },
900         { "Delete",     KEY_DC },
901         { "Hash",       '#' },
902         { "Home",       KEY_HOME },
903         { "End",        KEY_END },
904         { "PageUp",     KEY_PPAGE },
905         { "PageDown",   KEY_NPAGE },
906         { "F1",         KEY_F(1) },
907         { "F2",         KEY_F(2) },
908         { "F3",         KEY_F(3) },
909         { "F4",         KEY_F(4) },
910         { "F5",         KEY_F(5) },
911         { "F6",         KEY_F(6) },
912         { "F7",         KEY_F(7) },
913         { "F8",         KEY_F(8) },
914         { "F9",         KEY_F(9) },
915         { "F10",        KEY_F(10) },
916         { "F11",        KEY_F(11) },
917         { "F12",        KEY_F(12) },
918 };
919
920 static int
921 get_key_value(const char *name)
922 {
923         int i;
924
925         for (i = 0; i < ARRAY_SIZE(key_table); i++)
926                 if (!strcasecmp(key_table[i].name, name))
927                         return key_table[i].value;
928
929         if (strlen(name) == 1 && isprint(*name))
930                 return (int) *name;
931
932         return ERR;
933 }
934
935 static const char *
936 get_key_name(int key_value)
937 {
938         static char key_char[] = "'X'";
939         const char *seq = NULL;
940         int key;
941
942         for (key = 0; key < ARRAY_SIZE(key_table); key++)
943                 if (key_table[key].value == key_value)
944                         seq = key_table[key].name;
945
946         if (seq == NULL &&
947             key_value < 127 &&
948             isprint(key_value)) {
949                 key_char[1] = (char) key_value;
950                 seq = key_char;
951         }
952
953         return seq ? seq : "(no key)";
954 }
955
956 static const char *
957 get_key(enum request request)
958 {
959         static char buf[BUFSIZ];
960         size_t pos = 0;
961         char *sep = "";
962         int i;
963
964         buf[pos] = 0;
965
966         for (i = 0; i < ARRAY_SIZE(default_keybindings); i++) {
967                 struct keybinding *keybinding = &default_keybindings[i];
968
969                 if (keybinding->request != request)
970                         continue;
971
972                 if (!string_format_from(buf, &pos, "%s%s", sep,
973                                         get_key_name(keybinding->alias)))
974                         return "Too many keybindings!";
975                 sep = ", ";
976         }
977
978         return buf;
979 }
980
981 struct run_request {
982         enum keymap keymap;
983         int key;
984         char cmd[SIZEOF_STR];
985 };
986
987 static struct run_request *run_request;
988 static size_t run_requests;
989
990 static enum request
991 add_run_request(enum keymap keymap, int key, int argc, const char **argv)
992 {
993         struct run_request *req;
994         char cmd[SIZEOF_STR];
995         size_t bufpos;
996
997         for (bufpos = 0; argc > 0; argc--, argv++)
998                 if (!string_format_from(cmd, &bufpos, "%s ", *argv))
999                         return REQ_NONE;
1000
1001         req = realloc(run_request, (run_requests + 1) * sizeof(*run_request));
1002         if (!req)
1003                 return REQ_NONE;
1004
1005         run_request = req;
1006         req = &run_request[run_requests++];
1007         string_copy(req->cmd, cmd);
1008         req->keymap = keymap;
1009         req->key = key;
1010
1011         return REQ_NONE + run_requests;
1012 }
1013
1014 static struct run_request *
1015 get_run_request(enum request request)
1016 {
1017         if (request <= REQ_NONE)
1018                 return NULL;
1019         return &run_request[request - REQ_NONE - 1];
1020 }
1021
1022 static void
1023 add_builtin_run_requests(void)
1024 {
1025         struct {
1026                 enum keymap keymap;
1027                 int key;
1028                 const char *argv[1];
1029         } reqs[] = {
1030                 { KEYMAP_MAIN,    'C', { "git cherry-pick %(commit)" } },
1031                 { KEYMAP_GENERIC, 'G', { "git gc" } },
1032         };
1033         int i;
1034
1035         for (i = 0; i < ARRAY_SIZE(reqs); i++) {
1036                 enum request req;
1037
1038                 req = add_run_request(reqs[i].keymap, reqs[i].key, 1, reqs[i].argv);
1039                 if (req != REQ_NONE)
1040                         add_keybinding(reqs[i].keymap, req, reqs[i].key);
1041         }
1042 }
1043
1044 /*
1045  * User config file handling.
1046  */
1047
1048 static struct int_map color_map[] = {
1049 #define COLOR_MAP(name) { #name, STRING_SIZE(#name), COLOR_##name }
1050         COLOR_MAP(DEFAULT),
1051         COLOR_MAP(BLACK),
1052         COLOR_MAP(BLUE),
1053         COLOR_MAP(CYAN),
1054         COLOR_MAP(GREEN),
1055         COLOR_MAP(MAGENTA),
1056         COLOR_MAP(RED),
1057         COLOR_MAP(WHITE),
1058         COLOR_MAP(YELLOW),
1059 };
1060
1061 #define set_color(color, name) \
1062         set_from_int_map(color_map, ARRAY_SIZE(color_map), color, name, strlen(name))
1063
1064 static struct int_map attr_map[] = {
1065 #define ATTR_MAP(name) { #name, STRING_SIZE(#name), A_##name }
1066         ATTR_MAP(NORMAL),
1067         ATTR_MAP(BLINK),
1068         ATTR_MAP(BOLD),
1069         ATTR_MAP(DIM),
1070         ATTR_MAP(REVERSE),
1071         ATTR_MAP(STANDOUT),
1072         ATTR_MAP(UNDERLINE),
1073 };
1074
1075 #define set_attribute(attr, name) \
1076         set_from_int_map(attr_map, ARRAY_SIZE(attr_map), attr, name, strlen(name))
1077
1078 static int   config_lineno;
1079 static bool  config_errors;
1080 static const char *config_msg;
1081
1082 /* Wants: object fgcolor bgcolor [attr] */
1083 static int
1084 option_color_command(int argc, const char *argv[])
1085 {
1086         struct line_info *info;
1087
1088         if (argc != 3 && argc != 4) {
1089                 config_msg = "Wrong number of arguments given to color command";
1090                 return ERR;
1091         }
1092
1093         info = get_line_info(argv[0]);
1094         if (!info) {
1095                 if (!string_enum_compare(argv[0], "main-delim", strlen("main-delim"))) {
1096                         info = get_line_info("delimiter");
1097
1098                 } else if (!string_enum_compare(argv[0], "main-date", strlen("main-date"))) {
1099                         info = get_line_info("date");
1100
1101                 } else {
1102                         config_msg = "Unknown color name";
1103                         return ERR;
1104                 }
1105         }
1106
1107         if (set_color(&info->fg, argv[1]) == ERR ||
1108             set_color(&info->bg, argv[2]) == ERR) {
1109                 config_msg = "Unknown color";
1110                 return ERR;
1111         }
1112
1113         if (argc == 4 && set_attribute(&info->attr, argv[3]) == ERR) {
1114                 config_msg = "Unknown attribute";
1115                 return ERR;
1116         }
1117
1118         return OK;
1119 }
1120
1121 static bool parse_bool(const char *s)
1122 {
1123         return (!strcmp(s, "1") || !strcmp(s, "true") ||
1124                 !strcmp(s, "yes")) ? TRUE : FALSE;
1125 }
1126
1127 static int
1128 parse_int(const char *s, int default_value, int min, int max)
1129 {
1130         int value = atoi(s);
1131
1132         return (value < min || value > max) ? default_value : value;
1133 }
1134
1135 /* Wants: name = value */
1136 static int
1137 option_set_command(int argc, const char *argv[])
1138 {
1139         if (argc != 3) {
1140                 config_msg = "Wrong number of arguments given to set command";
1141                 return ERR;
1142         }
1143
1144         if (strcmp(argv[1], "=")) {
1145                 config_msg = "No value assigned";
1146                 return ERR;
1147         }
1148
1149         if (!strcmp(argv[0], "show-author")) {
1150                 opt_author = parse_bool(argv[2]);
1151                 return OK;
1152         }
1153
1154         if (!strcmp(argv[0], "show-date")) {
1155                 opt_date = parse_bool(argv[2]);
1156                 return OK;
1157         }
1158
1159         if (!strcmp(argv[0], "show-rev-graph")) {
1160                 opt_rev_graph = parse_bool(argv[2]);
1161                 return OK;
1162         }
1163
1164         if (!strcmp(argv[0], "show-refs")) {
1165                 opt_show_refs = parse_bool(argv[2]);
1166                 return OK;
1167         }
1168
1169         if (!strcmp(argv[0], "show-line-numbers")) {
1170                 opt_line_number = parse_bool(argv[2]);
1171                 return OK;
1172         }
1173
1174         if (!strcmp(argv[0], "line-graphics")) {
1175                 opt_line_graphics = parse_bool(argv[2]);
1176                 return OK;
1177         }
1178
1179         if (!strcmp(argv[0], "line-number-interval")) {
1180                 opt_num_interval = parse_int(argv[2], opt_num_interval, 1, 1024);
1181                 return OK;
1182         }
1183
1184         if (!strcmp(argv[0], "author-width")) {
1185                 opt_author_cols = parse_int(argv[2], opt_author_cols, 0, 1024);
1186                 return OK;
1187         }
1188
1189         if (!strcmp(argv[0], "tab-size")) {
1190                 opt_tab_size = parse_int(argv[2], opt_tab_size, 1, 1024);
1191                 return OK;
1192         }
1193
1194         if (!strcmp(argv[0], "commit-encoding")) {
1195                 const char *arg = argv[2];
1196                 int arglen = strlen(arg);
1197
1198                 switch (arg[0]) {
1199                 case '"':
1200                 case '\'':
1201                         if (arglen == 1 || arg[arglen - 1] != arg[0]) {
1202                                 config_msg = "Unmatched quotation";
1203                                 return ERR;
1204                         }
1205                         arg += 1; arglen -= 2;
1206                 default:
1207                         string_ncopy(opt_encoding, arg, strlen(arg));
1208                         return OK;
1209                 }
1210         }
1211
1212         config_msg = "Unknown variable name";
1213         return ERR;
1214 }
1215
1216 /* Wants: mode request key */
1217 static int
1218 option_bind_command(int argc, const char *argv[])
1219 {
1220         enum request request;
1221         int keymap;
1222         int key;
1223
1224         if (argc < 3) {
1225                 config_msg = "Wrong number of arguments given to bind command";
1226                 return ERR;
1227         }
1228
1229         if (set_keymap(&keymap, argv[0]) == ERR) {
1230                 config_msg = "Unknown key map";
1231                 return ERR;
1232         }
1233
1234         key = get_key_value(argv[1]);
1235         if (key == ERR) {
1236                 config_msg = "Unknown key";
1237                 return ERR;
1238         }
1239
1240         request = get_request(argv[2]);
1241         if (request == REQ_NONE) {
1242                 const char *obsolete[] = { "cherry-pick" };
1243                 size_t namelen = strlen(argv[2]);
1244                 int i;
1245
1246                 for (i = 0; i < ARRAY_SIZE(obsolete); i++) {
1247                         if (namelen == strlen(obsolete[i]) &&
1248                             !string_enum_compare(obsolete[i], argv[2], namelen)) {
1249                                 config_msg = "Obsolete request name";
1250                                 return ERR;
1251                         }
1252                 }
1253         }
1254         if (request == REQ_NONE && *argv[2]++ == '!')
1255                 request = add_run_request(keymap, key, argc - 2, argv + 2);
1256         if (request == REQ_NONE) {
1257                 config_msg = "Unknown request name";
1258                 return ERR;
1259         }
1260
1261         add_keybinding(keymap, request, key);
1262
1263         return OK;
1264 }
1265
1266 static int
1267 set_option(const char *opt, char *value)
1268 {
1269         const char *argv[SIZEOF_ARG];
1270         int valuelen;
1271         int argc = 0;
1272
1273         /* Tokenize */
1274         while (argc < ARRAY_SIZE(argv) && (valuelen = strcspn(value, " \t"))) {
1275                 argv[argc++] = value;
1276                 value += valuelen;
1277
1278                 /* Nothing more to tokenize or last available token. */
1279                 if (!*value || argc >= ARRAY_SIZE(argv))
1280                         break;
1281
1282                 *value++ = 0;
1283                 while (isspace(*value))
1284                         value++;
1285         }
1286
1287         if (!strcmp(opt, "color"))
1288                 return option_color_command(argc, argv);
1289
1290         if (!strcmp(opt, "set"))
1291                 return option_set_command(argc, argv);
1292
1293         if (!strcmp(opt, "bind"))
1294                 return option_bind_command(argc, argv);
1295
1296         config_msg = "Unknown option command";
1297         return ERR;
1298 }
1299
1300 static int
1301 read_option(char *opt, size_t optlen, char *value, size_t valuelen)
1302 {
1303         int status = OK;
1304
1305         config_lineno++;
1306         config_msg = "Internal error";
1307
1308         /* Check for comment markers, since read_properties() will
1309          * only ensure opt and value are split at first " \t". */
1310         optlen = strcspn(opt, "#");
1311         if (optlen == 0)
1312                 return OK;
1313
1314         if (opt[optlen] != 0) {
1315                 config_msg = "No option value";
1316                 status = ERR;
1317
1318         }  else {
1319                 /* Look for comment endings in the value. */
1320                 size_t len = strcspn(value, "#");
1321
1322                 if (len < valuelen) {
1323                         valuelen = len;
1324                         value[valuelen] = 0;
1325                 }
1326
1327                 status = set_option(opt, value);
1328         }
1329
1330         if (status == ERR) {
1331                 fprintf(stderr, "Error on line %d, near '%.*s': %s\n",
1332                         config_lineno, (int) optlen, opt, config_msg);
1333                 config_errors = TRUE;
1334         }
1335
1336         /* Always keep going if errors are encountered. */
1337         return OK;
1338 }
1339
1340 static void
1341 load_option_file(const char *path)
1342 {
1343         FILE *file;
1344
1345         /* It's ok that the file doesn't exist. */
1346         file = fopen(path, "r");
1347         if (!file)
1348                 return;
1349
1350         config_lineno = 0;
1351         config_errors = FALSE;
1352
1353         if (read_properties(file, " \t", read_option) == ERR ||
1354             config_errors == TRUE)
1355                 fprintf(stderr, "Errors while loading %s.\n", path);
1356 }
1357
1358 static int
1359 load_options(void)
1360 {
1361         const char *home = getenv("HOME");
1362         const char *tigrc_user = getenv("TIGRC_USER");
1363         const char *tigrc_system = getenv("TIGRC_SYSTEM");
1364         char buf[SIZEOF_STR];
1365
1366         add_builtin_run_requests();
1367
1368         if (!tigrc_system) {
1369                 if (!string_format(buf, "%s/tigrc", SYSCONFDIR))
1370                         return ERR;
1371                 tigrc_system = buf;
1372         }
1373         load_option_file(tigrc_system);
1374
1375         if (!tigrc_user) {
1376                 if (!home || !string_format(buf, "%s/.tigrc", home))
1377                         return ERR;
1378                 tigrc_user = buf;
1379         }
1380         load_option_file(tigrc_user);
1381
1382         return OK;
1383 }
1384
1385
1386 /*
1387  * The viewer
1388  */
1389
1390 struct view;
1391 struct view_ops;
1392
1393 /* The display array of active views and the index of the current view. */
1394 static struct view *display[2];
1395 static unsigned int current_view;
1396
1397 /* Reading from the prompt? */
1398 static bool input_mode = FALSE;
1399
1400 #define foreach_displayed_view(view, i) \
1401         for (i = 0; i < ARRAY_SIZE(display) && (view = display[i]); i++)
1402
1403 #define displayed_views()       (display[1] != NULL ? 2 : 1)
1404
1405 /* Current head and commit ID */
1406 static char ref_blob[SIZEOF_REF]        = "";
1407 static char ref_commit[SIZEOF_REF]      = "HEAD";
1408 static char ref_head[SIZEOF_REF]        = "HEAD";
1409
1410 struct view {
1411         const char *name;       /* View name */
1412         const char *cmd_fmt;    /* Default command line format */
1413         const char *cmd_env;    /* Command line set via environment */
1414         const char *id;         /* Points to either of ref_{head,commit,blob} */
1415
1416         struct view_ops *ops;   /* View operations */
1417
1418         enum keymap keymap;     /* What keymap does this view have */
1419         bool git_dir;           /* Whether the view requires a git directory. */
1420
1421         char cmd[SIZEOF_STR];   /* Command buffer */
1422         char ref[SIZEOF_REF];   /* Hovered commit reference */
1423         char vid[SIZEOF_REF];   /* View ID. Set to id member when updating. */
1424
1425         int height, width;      /* The width and height of the main window */
1426         WINDOW *win;            /* The main window */
1427         WINDOW *title;          /* The title window living below the main window */
1428
1429         /* Navigation */
1430         unsigned long offset;   /* Offset of the window top */
1431         unsigned long lineno;   /* Current line number */
1432
1433         /* Searching */
1434         char grep[SIZEOF_STR];  /* Search string */
1435         regex_t *regex;         /* Pre-compiled regex */
1436
1437         /* If non-NULL, points to the view that opened this view. If this view
1438          * is closed tig will switch back to the parent view. */
1439         struct view *parent;
1440
1441         /* Buffering */
1442         size_t lines;           /* Total number of lines */
1443         struct line *line;      /* Line index */
1444         size_t line_alloc;      /* Total number of allocated lines */
1445         size_t line_size;       /* Total number of used lines */
1446         unsigned int digits;    /* Number of digits in the lines member. */
1447
1448         /* Drawing */
1449         struct line *curline;   /* Line currently being drawn. */
1450         enum line_type curtype; /* Attribute currently used for drawing. */
1451         unsigned long col;      /* Column when drawing. */
1452
1453         /* Loading */
1454         FILE *pipe;
1455         time_t start_time;
1456 };
1457
1458 struct view_ops {
1459         /* What type of content being displayed. Used in the title bar. */
1460         const char *type;
1461         /* Open and reads in all view content. */
1462         bool (*open)(struct view *view);
1463         /* Read one line; updates view->line. */
1464         bool (*read)(struct view *view, char *data);
1465         /* Draw one line; @lineno must be < view->height. */
1466         bool (*draw)(struct view *view, struct line *line, unsigned int lineno);
1467         /* Depending on view handle a special requests. */
1468         enum request (*request)(struct view *view, enum request request, struct line *line);
1469         /* Search for regex in a line. */
1470         bool (*grep)(struct view *view, struct line *line);
1471         /* Select line */
1472         void (*select)(struct view *view, struct line *line);
1473 };
1474
1475 static struct view_ops blame_ops;
1476 static struct view_ops blob_ops;
1477 static struct view_ops help_ops;
1478 static struct view_ops log_ops;
1479 static struct view_ops main_ops;
1480 static struct view_ops pager_ops;
1481 static struct view_ops stage_ops;
1482 static struct view_ops status_ops;
1483 static struct view_ops tree_ops;
1484
1485 #define VIEW_STR(name, cmd, env, ref, ops, map, git) \
1486         { name, cmd, #env, ref, ops, map, git }
1487
1488 #define VIEW_(id, name, ops, git, ref) \
1489         VIEW_STR(name, TIG_##id##_CMD,  TIG_##id##_CMD, ref, ops, KEYMAP_##id, git)
1490
1491
1492 static struct view views[] = {
1493         VIEW_(MAIN,   "main",   &main_ops,   TRUE,  ref_head),
1494         VIEW_(DIFF,   "diff",   &pager_ops,  TRUE,  ref_commit),
1495         VIEW_(LOG,    "log",    &log_ops,    TRUE,  ref_head),
1496         VIEW_(TREE,   "tree",   &tree_ops,   TRUE,  ref_commit),
1497         VIEW_(BLOB,   "blob",   &blob_ops,   TRUE,  ref_blob),
1498         VIEW_(BLAME,  "blame",  &blame_ops,  TRUE,  ref_commit),
1499         VIEW_(HELP,   "help",   &help_ops,   FALSE, ""),
1500         VIEW_(PAGER,  "pager",  &pager_ops,  FALSE, "stdin"),
1501         VIEW_(STATUS, "status", &status_ops, TRUE,  ""),
1502         VIEW_(STAGE,  "stage",  &stage_ops,  TRUE,  ""),
1503 };
1504
1505 #define VIEW(req)       (&views[(req) - REQ_OFFSET - 1])
1506 #define VIEW_REQ(view)  ((view) - views + REQ_OFFSET + 1)
1507
1508 #define foreach_view(view, i) \
1509         for (i = 0; i < ARRAY_SIZE(views) && (view = &views[i]); i++)
1510
1511 #define view_is_displayed(view) \
1512         (view == display[0] || view == display[1])
1513
1514
1515 enum line_graphic {
1516         LINE_GRAPHIC_VLINE
1517 };
1518
1519 static int line_graphics[] = {
1520         /* LINE_GRAPHIC_VLINE: */ '|'
1521 };
1522
1523 static inline void
1524 set_view_attr(struct view *view, enum line_type type)
1525 {
1526         if (!view->curline->selected && view->curtype != type) {
1527                 wattrset(view->win, get_line_attr(type));
1528                 wchgat(view->win, -1, 0, type, NULL);
1529                 view->curtype = type;
1530         }
1531 }
1532
1533 static int
1534 draw_chars(struct view *view, enum line_type type, const char *string,
1535            int max_len, bool use_tilde)
1536 {
1537         int len = 0;
1538         int col = 0;
1539         int trimmed = FALSE;
1540
1541         if (max_len <= 0)
1542                 return 0;
1543
1544         if (opt_utf8) {
1545                 len = utf8_length(string, &col, max_len, &trimmed, use_tilde);
1546         } else {
1547                 col = len = strlen(string);
1548                 if (len > max_len) {
1549                         if (use_tilde) {
1550                                 max_len -= 1;
1551                         }
1552                         col = len = max_len;
1553                         trimmed = TRUE;
1554                 }
1555         }
1556
1557         set_view_attr(view, type);
1558         waddnstr(view->win, string, len);
1559         if (trimmed && use_tilde) {
1560                 set_view_attr(view, LINE_DELIMITER);
1561                 waddch(view->win, '~');
1562                 col++;
1563         }
1564
1565         return col;
1566 }
1567
1568 static int
1569 draw_space(struct view *view, enum line_type type, int max, int spaces)
1570 {
1571         static char space[] = "                    ";
1572         int col = 0;
1573
1574         spaces = MIN(max, spaces);
1575
1576         while (spaces > 0) {
1577                 int len = MIN(spaces, sizeof(space) - 1);
1578
1579                 col += draw_chars(view, type, space, spaces, FALSE);
1580                 spaces -= len;
1581         }
1582
1583         return col;
1584 }
1585
1586 static bool
1587 draw_lineno(struct view *view, unsigned int lineno)
1588 {
1589         char number[10];
1590         int digits3 = view->digits < 3 ? 3 : view->digits;
1591         int max_number = MIN(digits3, STRING_SIZE(number));
1592         int max = view->width - view->col;
1593         int col;
1594
1595         if (max < max_number)
1596                 max_number = max;
1597
1598         lineno += view->offset + 1;
1599         if (lineno == 1 || (lineno % opt_num_interval) == 0) {
1600                 static char fmt[] = "%1ld";
1601
1602                 if (view->digits <= 9)
1603                         fmt[1] = '0' + digits3;
1604
1605                 if (!string_format(number, fmt, lineno))
1606                         number[0] = 0;
1607                 col = draw_chars(view, LINE_LINE_NUMBER, number, max_number, TRUE);
1608         } else {
1609                 col = draw_space(view, LINE_LINE_NUMBER, max_number, max_number);
1610         }
1611
1612         if (col < max) {
1613                 set_view_attr(view, LINE_DEFAULT);
1614                 waddch(view->win, line_graphics[LINE_GRAPHIC_VLINE]);
1615                 col++;
1616         }
1617
1618         if (col < max)
1619                 col += draw_space(view, LINE_DEFAULT, max - col, 1);
1620         view->col += col;
1621
1622         return view->width - view->col <= 0;
1623 }
1624
1625 static bool
1626 draw_text(struct view *view, enum line_type type, const char *string, bool trim)
1627 {
1628         view->col += draw_chars(view, type, string, view->width - view->col, trim);
1629         return view->width - view->col <= 0;
1630 }
1631
1632 static bool
1633 draw_graphic(struct view *view, enum line_type type, chtype graphic[], size_t size)
1634 {
1635         int max = view->width - view->col;
1636         int i;
1637
1638         if (max < size)
1639                 size = max;
1640
1641         set_view_attr(view, type);
1642         /* Using waddch() instead of waddnstr() ensures that
1643          * they'll be rendered correctly for the cursor line. */
1644         for (i = 0; i < size; i++)
1645                 waddch(view->win, graphic[i]);
1646
1647         view->col += size;
1648         if (size < max) {
1649                 waddch(view->win, ' ');
1650                 view->col++;
1651         }
1652
1653         return view->width - view->col <= 0;
1654 }
1655
1656 static bool
1657 draw_field(struct view *view, enum line_type type, const char *text, int len, bool trim)
1658 {
1659         int max = MIN(view->width - view->col, len);
1660         int col;
1661
1662         if (text)
1663                 col = draw_chars(view, type, text, max - 1, trim);
1664         else
1665                 col = draw_space(view, type, max - 1, max - 1);
1666
1667         view->col += col + draw_space(view, LINE_DEFAULT, max - col, max - col);
1668         return view->width - view->col <= 0;
1669 }
1670
1671 static bool
1672 draw_date(struct view *view, struct tm *time)
1673 {
1674         char buf[DATE_COLS];
1675         char *date;
1676         int timelen = 0;
1677
1678         if (time)
1679                 timelen = strftime(buf, sizeof(buf), DATE_FORMAT, time);
1680         date = timelen ? buf : NULL;
1681
1682         return draw_field(view, LINE_DATE, date, DATE_COLS, FALSE);
1683 }
1684
1685 static bool
1686 draw_view_line(struct view *view, unsigned int lineno)
1687 {
1688         struct line *line;
1689         bool selected = (view->offset + lineno == view->lineno);
1690         bool draw_ok;
1691
1692         assert(view_is_displayed(view));
1693
1694         if (view->offset + lineno >= view->lines)
1695                 return FALSE;
1696
1697         line = &view->line[view->offset + lineno];
1698
1699         wmove(view->win, lineno, 0);
1700         view->col = 0;
1701         view->curline = line;
1702         view->curtype = LINE_NONE;
1703         line->selected = FALSE;
1704
1705         if (selected) {
1706                 set_view_attr(view, LINE_CURSOR);
1707                 line->selected = TRUE;
1708                 view->ops->select(view, line);
1709         } else if (line->selected) {
1710                 wclrtoeol(view->win);
1711         }
1712
1713         scrollok(view->win, FALSE);
1714         draw_ok = view->ops->draw(view, line, lineno);
1715         scrollok(view->win, TRUE);
1716
1717         return draw_ok;
1718 }
1719
1720 static void
1721 redraw_view_dirty(struct view *view)
1722 {
1723         bool dirty = FALSE;
1724         int lineno;
1725
1726         for (lineno = 0; lineno < view->height; lineno++) {
1727                 struct line *line = &view->line[view->offset + lineno];
1728
1729                 if (!line->dirty)
1730                         continue;
1731                 line->dirty = 0;
1732                 dirty = TRUE;
1733                 if (!draw_view_line(view, lineno))
1734                         break;
1735         }
1736
1737         if (!dirty)
1738                 return;
1739         redrawwin(view->win);
1740         if (input_mode)
1741                 wnoutrefresh(view->win);
1742         else
1743                 wrefresh(view->win);
1744 }
1745
1746 static void
1747 redraw_view_from(struct view *view, int lineno)
1748 {
1749         assert(0 <= lineno && lineno < view->height);
1750
1751         for (; lineno < view->height; lineno++) {
1752                 if (!draw_view_line(view, lineno))
1753                         break;
1754         }
1755
1756         redrawwin(view->win);
1757         if (input_mode)
1758                 wnoutrefresh(view->win);
1759         else
1760                 wrefresh(view->win);
1761 }
1762
1763 static void
1764 redraw_view(struct view *view)
1765 {
1766         wclear(view->win);
1767         redraw_view_from(view, 0);
1768 }
1769
1770
1771 static void
1772 update_view_title(struct view *view)
1773 {
1774         char buf[SIZEOF_STR];
1775         char state[SIZEOF_STR];
1776         size_t bufpos = 0, statelen = 0;
1777
1778         assert(view_is_displayed(view));
1779
1780         if (view != VIEW(REQ_VIEW_STATUS) && (view->lines || view->pipe)) {
1781                 unsigned int view_lines = view->offset + view->height;
1782                 unsigned int lines = view->lines
1783                                    ? MIN(view_lines, view->lines) * 100 / view->lines
1784                                    : 0;
1785
1786                 string_format_from(state, &statelen, "- %s %d of %d (%d%%)",
1787                                    view->ops->type,
1788                                    view->lineno + 1,
1789                                    view->lines,
1790                                    lines);
1791
1792                 if (view->pipe) {
1793                         time_t secs = time(NULL) - view->start_time;
1794
1795                         /* Three git seconds are a long time ... */
1796                         if (secs > 2)
1797                                 string_format_from(state, &statelen, " %lds", secs);
1798                 }
1799         }
1800
1801         string_format_from(buf, &bufpos, "[%s]", view->name);
1802         if (*view->ref && bufpos < view->width) {
1803                 size_t refsize = strlen(view->ref);
1804                 size_t minsize = bufpos + 1 + /* abbrev= */ 7 + 1 + statelen;
1805
1806                 if (minsize < view->width)
1807                         refsize = view->width - minsize + 7;
1808                 string_format_from(buf, &bufpos, " %.*s", (int) refsize, view->ref);
1809         }
1810
1811         if (statelen && bufpos < view->width) {
1812                 string_format_from(buf, &bufpos, " %s", state);
1813         }
1814
1815         if (view == display[current_view])
1816                 wbkgdset(view->title, get_line_attr(LINE_TITLE_FOCUS));
1817         else
1818                 wbkgdset(view->title, get_line_attr(LINE_TITLE_BLUR));
1819
1820         mvwaddnstr(view->title, 0, 0, buf, bufpos);
1821         wclrtoeol(view->title);
1822         wmove(view->title, 0, view->width - 1);
1823
1824         if (input_mode)
1825                 wnoutrefresh(view->title);
1826         else
1827                 wrefresh(view->title);
1828 }
1829
1830 static void
1831 resize_display(void)
1832 {
1833         int offset, i;
1834         struct view *base = display[0];
1835         struct view *view = display[1] ? display[1] : display[0];
1836
1837         /* Setup window dimensions */
1838
1839         getmaxyx(stdscr, base->height, base->width);
1840
1841         /* Make room for the status window. */
1842         base->height -= 1;
1843
1844         if (view != base) {
1845                 /* Horizontal split. */
1846                 view->width   = base->width;
1847                 view->height  = SCALE_SPLIT_VIEW(base->height);
1848                 base->height -= view->height;
1849
1850                 /* Make room for the title bar. */
1851                 view->height -= 1;
1852         }
1853
1854         /* Make room for the title bar. */
1855         base->height -= 1;
1856
1857         offset = 0;
1858
1859         foreach_displayed_view (view, i) {
1860                 if (!view->win) {
1861                         view->win = newwin(view->height, 0, offset, 0);
1862                         if (!view->win)
1863                                 die("Failed to create %s view", view->name);
1864
1865                         scrollok(view->win, TRUE);
1866
1867                         view->title = newwin(1, 0, offset + view->height, 0);
1868                         if (!view->title)
1869                                 die("Failed to create title window");
1870
1871                 } else {
1872                         wresize(view->win, view->height, view->width);
1873                         mvwin(view->win,   offset, 0);
1874                         mvwin(view->title, offset + view->height, 0);
1875                 }
1876
1877                 offset += view->height + 1;
1878         }
1879 }
1880
1881 static void
1882 redraw_display(void)
1883 {
1884         struct view *view;
1885         int i;
1886
1887         foreach_displayed_view (view, i) {
1888                 redraw_view(view);
1889                 update_view_title(view);
1890         }
1891 }
1892
1893 static void
1894 update_display_cursor(struct view *view)
1895 {
1896         /* Move the cursor to the right-most column of the cursor line.
1897          *
1898          * XXX: This could turn out to be a bit expensive, but it ensures that
1899          * the cursor does not jump around. */
1900         if (view->lines) {
1901                 wmove(view->win, view->lineno - view->offset, view->width - 1);
1902                 wrefresh(view->win);
1903         }
1904 }
1905
1906 /*
1907  * Navigation
1908  */
1909
1910 /* Scrolling backend */
1911 static void
1912 do_scroll_view(struct view *view, int lines)
1913 {
1914         bool redraw_current_line = FALSE;
1915
1916         /* The rendering expects the new offset. */
1917         view->offset += lines;
1918
1919         assert(0 <= view->offset && view->offset < view->lines);
1920         assert(lines);
1921
1922         /* Move current line into the view. */
1923         if (view->lineno < view->offset) {
1924                 view->lineno = view->offset;
1925                 redraw_current_line = TRUE;
1926         } else if (view->lineno >= view->offset + view->height) {
1927                 view->lineno = view->offset + view->height - 1;
1928                 redraw_current_line = TRUE;
1929         }
1930
1931         assert(view->offset <= view->lineno && view->lineno < view->lines);
1932
1933         /* Redraw the whole screen if scrolling is pointless. */
1934         if (view->height < ABS(lines)) {
1935                 redraw_view(view);
1936
1937         } else {
1938                 int line = lines > 0 ? view->height - lines : 0;
1939                 int end = line + ABS(lines);
1940
1941                 wscrl(view->win, lines);
1942
1943                 for (; line < end; line++) {
1944                         if (!draw_view_line(view, line))
1945                                 break;
1946                 }
1947
1948                 if (redraw_current_line)
1949                         draw_view_line(view, view->lineno - view->offset);
1950         }
1951
1952         redrawwin(view->win);
1953         wrefresh(view->win);
1954         report("");
1955 }
1956
1957 /* Scroll frontend */
1958 static void
1959 scroll_view(struct view *view, enum request request)
1960 {
1961         int lines = 1;
1962
1963         assert(view_is_displayed(view));
1964
1965         switch (request) {
1966         case REQ_SCROLL_PAGE_DOWN:
1967                 lines = view->height;
1968         case REQ_SCROLL_LINE_DOWN:
1969                 if (view->offset + lines > view->lines)
1970                         lines = view->lines - view->offset;
1971
1972                 if (lines == 0 || view->offset + view->height >= view->lines) {
1973                         report("Cannot scroll beyond the last line");
1974                         return;
1975                 }
1976                 break;
1977
1978         case REQ_SCROLL_PAGE_UP:
1979                 lines = view->height;
1980         case REQ_SCROLL_LINE_UP:
1981                 if (lines > view->offset)
1982                         lines = view->offset;
1983
1984                 if (lines == 0) {
1985                         report("Cannot scroll beyond the first line");
1986                         return;
1987                 }
1988
1989                 lines = -lines;
1990                 break;
1991
1992         default:
1993                 die("request %d not handled in switch", request);
1994         }
1995
1996         do_scroll_view(view, lines);
1997 }
1998
1999 /* Cursor moving */
2000 static void
2001 move_view(struct view *view, enum request request)
2002 {
2003         int scroll_steps = 0;
2004         int steps;
2005
2006         switch (request) {
2007         case REQ_MOVE_FIRST_LINE:
2008                 steps = -view->lineno;
2009                 break;
2010
2011         case REQ_MOVE_LAST_LINE:
2012                 steps = view->lines - view->lineno - 1;
2013                 break;
2014
2015         case REQ_MOVE_PAGE_UP:
2016                 steps = view->height > view->lineno
2017                       ? -view->lineno : -view->height;
2018                 break;
2019
2020         case REQ_MOVE_PAGE_DOWN:
2021                 steps = view->lineno + view->height >= view->lines
2022                       ? view->lines - view->lineno - 1 : view->height;
2023                 break;
2024
2025         case REQ_MOVE_UP:
2026                 steps = -1;
2027                 break;
2028
2029         case REQ_MOVE_DOWN:
2030                 steps = 1;
2031                 break;
2032
2033         default:
2034                 die("request %d not handled in switch", request);
2035         }
2036
2037         if (steps <= 0 && view->lineno == 0) {
2038                 report("Cannot move beyond the first line");
2039                 return;
2040
2041         } else if (steps >= 0 && view->lineno + 1 >= view->lines) {
2042                 report("Cannot move beyond the last line");
2043                 return;
2044         }
2045
2046         /* Move the current line */
2047         view->lineno += steps;
2048         assert(0 <= view->lineno && view->lineno < view->lines);
2049
2050         /* Check whether the view needs to be scrolled */
2051         if (view->lineno < view->offset ||
2052             view->lineno >= view->offset + view->height) {
2053                 scroll_steps = steps;
2054                 if (steps < 0 && -steps > view->offset) {
2055                         scroll_steps = -view->offset;
2056
2057                 } else if (steps > 0) {
2058                         if (view->lineno == view->lines - 1 &&
2059                             view->lines > view->height) {
2060                                 scroll_steps = view->lines - view->offset - 1;
2061                                 if (scroll_steps >= view->height)
2062                                         scroll_steps -= view->height - 1;
2063                         }
2064                 }
2065         }
2066
2067         if (!view_is_displayed(view)) {
2068                 view->offset += scroll_steps;
2069                 assert(0 <= view->offset && view->offset < view->lines);
2070                 view->ops->select(view, &view->line[view->lineno]);
2071                 return;
2072         }
2073
2074         /* Repaint the old "current" line if we be scrolling */
2075         if (ABS(steps) < view->height)
2076                 draw_view_line(view, view->lineno - steps - view->offset);
2077
2078         if (scroll_steps) {
2079                 do_scroll_view(view, scroll_steps);
2080                 return;
2081         }
2082
2083         /* Draw the current line */
2084         draw_view_line(view, view->lineno - view->offset);
2085
2086         redrawwin(view->win);
2087         wrefresh(view->win);
2088         report("");
2089 }
2090
2091
2092 /*
2093  * Searching
2094  */
2095
2096 static void search_view(struct view *view, enum request request);
2097
2098 static bool
2099 find_next_line(struct view *view, unsigned long lineno, struct line *line)
2100 {
2101         assert(view_is_displayed(view));
2102
2103         if (!view->ops->grep(view, line))
2104                 return FALSE;
2105
2106         if (lineno - view->offset >= view->height) {
2107                 view->offset = lineno;
2108                 view->lineno = lineno;
2109                 redraw_view(view);
2110
2111         } else {
2112                 unsigned long old_lineno = view->lineno - view->offset;
2113
2114                 view->lineno = lineno;
2115                 draw_view_line(view, old_lineno);
2116
2117                 draw_view_line(view, view->lineno - view->offset);
2118                 redrawwin(view->win);
2119                 wrefresh(view->win);
2120         }
2121
2122         report("Line %ld matches '%s'", lineno + 1, view->grep);
2123         return TRUE;
2124 }
2125
2126 static void
2127 find_next(struct view *view, enum request request)
2128 {
2129         unsigned long lineno = view->lineno;
2130         int direction;
2131
2132         if (!*view->grep) {
2133                 if (!*opt_search)
2134                         report("No previous search");
2135                 else
2136                         search_view(view, request);
2137                 return;
2138         }
2139
2140         switch (request) {
2141         case REQ_SEARCH:
2142         case REQ_FIND_NEXT:
2143                 direction = 1;
2144                 break;
2145
2146         case REQ_SEARCH_BACK:
2147         case REQ_FIND_PREV:
2148                 direction = -1;
2149                 break;
2150
2151         default:
2152                 return;
2153         }
2154
2155         if (request == REQ_FIND_NEXT || request == REQ_FIND_PREV)
2156                 lineno += direction;
2157
2158         /* Note, lineno is unsigned long so will wrap around in which case it
2159          * will become bigger than view->lines. */
2160         for (; lineno < view->lines; lineno += direction) {
2161                 struct line *line = &view->line[lineno];
2162
2163                 if (find_next_line(view, lineno, line))
2164                         return;
2165         }
2166
2167         report("No match found for '%s'", view->grep);
2168 }
2169
2170 static void
2171 search_view(struct view *view, enum request request)
2172 {
2173         int regex_err;
2174
2175         if (view->regex) {
2176                 regfree(view->regex);
2177                 *view->grep = 0;
2178         } else {
2179                 view->regex = calloc(1, sizeof(*view->regex));
2180                 if (!view->regex)
2181                         return;
2182         }
2183
2184         regex_err = regcomp(view->regex, opt_search, REG_EXTENDED);
2185         if (regex_err != 0) {
2186                 char buf[SIZEOF_STR] = "unknown error";
2187
2188                 regerror(regex_err, view->regex, buf, sizeof(buf));
2189                 report("Search failed: %s", buf);
2190                 return;
2191         }
2192
2193         string_copy(view->grep, opt_search);
2194
2195         find_next(view, request);
2196 }
2197
2198 /*
2199  * Incremental updating
2200  */
2201
2202 static void
2203 reset_view(struct view *view)
2204 {
2205         int i;
2206
2207         for (i = 0; i < view->lines; i++)
2208                 free(view->line[i].data);
2209         free(view->line);
2210
2211         view->line = NULL;
2212         view->offset = 0;
2213         view->lines  = 0;
2214         view->lineno = 0;
2215         view->line_size = 0;
2216         view->line_alloc = 0;
2217         view->vid[0] = 0;
2218 }
2219
2220 static void
2221 end_update(struct view *view, bool force)
2222 {
2223         if (!view->pipe)
2224                 return;
2225         while (!view->ops->read(view, NULL))
2226                 if (!force)
2227                         return;
2228         set_nonblocking_input(FALSE);
2229         if (view->pipe == stdin)
2230                 fclose(view->pipe);
2231         else
2232                 pclose(view->pipe);
2233         view->pipe = NULL;
2234 }
2235
2236 static bool
2237 begin_update(struct view *view, bool refresh)
2238 {
2239         if (opt_cmd[0]) {
2240                 string_copy(view->cmd, opt_cmd);
2241                 opt_cmd[0] = 0;
2242                 /* When running random commands, initially show the
2243                  * command in the title. However, it maybe later be
2244                  * overwritten if a commit line is selected. */
2245                 if (view == VIEW(REQ_VIEW_PAGER))
2246                         string_copy(view->ref, view->cmd);
2247                 else
2248                         view->ref[0] = 0;
2249
2250         } else if (view == VIEW(REQ_VIEW_TREE)) {
2251                 const char *format = view->cmd_env ? view->cmd_env : view->cmd_fmt;
2252                 char path[SIZEOF_STR];
2253
2254                 if (strcmp(view->vid, view->id))
2255                         opt_path[0] = path[0] = 0;
2256                 else if (sq_quote(path, 0, opt_path) >= sizeof(path))
2257                         return FALSE;
2258
2259                 if (!string_format(view->cmd, format, view->id, path))
2260                         return FALSE;
2261
2262         } else if (!refresh) {
2263                 const char *format = view->cmd_env ? view->cmd_env : view->cmd_fmt;
2264                 const char *id = view->id;
2265
2266                 if (!string_format(view->cmd, format, id, id, id, id, id))
2267                         return FALSE;
2268
2269                 /* Put the current ref_* value to the view title ref
2270                  * member. This is needed by the blob view. Most other
2271                  * views sets it automatically after loading because the
2272                  * first line is a commit line. */
2273                 string_copy_rev(view->ref, view->id);
2274         }
2275
2276         /* Special case for the pager view. */
2277         if (opt_pipe) {
2278                 view->pipe = opt_pipe;
2279                 opt_pipe = NULL;
2280         } else {
2281                 view->pipe = popen(view->cmd, "r");
2282         }
2283
2284         if (!view->pipe)
2285                 return FALSE;
2286
2287         set_nonblocking_input(TRUE);
2288         reset_view(view);
2289         string_copy_rev(view->vid, view->id);
2290
2291         view->start_time = time(NULL);
2292
2293         return TRUE;
2294 }
2295
2296 #define ITEM_CHUNK_SIZE 256
2297 static void *
2298 realloc_items(void *mem, size_t *size, size_t new_size, size_t item_size)
2299 {
2300         size_t num_chunks = *size / ITEM_CHUNK_SIZE;
2301         size_t num_chunks_new = (new_size + ITEM_CHUNK_SIZE - 1) / ITEM_CHUNK_SIZE;
2302
2303         if (mem == NULL || num_chunks != num_chunks_new) {
2304                 *size = num_chunks_new * ITEM_CHUNK_SIZE;
2305                 mem = realloc(mem, *size * item_size);
2306         }
2307
2308         return mem;
2309 }
2310
2311 static struct line *
2312 realloc_lines(struct view *view, size_t line_size)
2313 {
2314         size_t alloc = view->line_alloc;
2315         struct line *tmp = realloc_items(view->line, &alloc, line_size,
2316                                          sizeof(*view->line));
2317
2318         if (!tmp)
2319                 return NULL;
2320
2321         view->line = tmp;
2322         view->line_alloc = alloc;
2323         view->line_size = line_size;
2324         return view->line;
2325 }
2326
2327 static bool
2328 update_view(struct view *view)
2329 {
2330         char in_buffer[BUFSIZ];
2331         char out_buffer[BUFSIZ * 2];
2332         char *line;
2333         /* The number of lines to read. If too low it will cause too much
2334          * redrawing (and possible flickering), if too high responsiveness
2335          * will suffer. */
2336         unsigned long lines = view->height;
2337         int redraw_from = -1;
2338
2339         if (!view->pipe)
2340                 return TRUE;
2341
2342         /* Only redraw if lines are visible. */
2343         if (view->offset + view->height >= view->lines)
2344                 redraw_from = view->lines - view->offset;
2345
2346         /* FIXME: This is probably not perfect for backgrounded views. */
2347         if (!realloc_lines(view, view->lines + lines))
2348                 goto alloc_error;
2349
2350         while ((line = fgets(in_buffer, sizeof(in_buffer), view->pipe))) {
2351                 size_t linelen = strlen(line);
2352
2353                 if (linelen)
2354                         line[linelen - 1] = 0;
2355
2356                 if (opt_iconv != ICONV_NONE) {
2357                         ICONV_CONST char *inbuf = line;
2358                         size_t inlen = linelen;
2359
2360                         char *outbuf = out_buffer;
2361                         size_t outlen = sizeof(out_buffer);
2362
2363                         size_t ret;
2364
2365                         ret = iconv(opt_iconv, &inbuf, &inlen, &outbuf, &outlen);
2366                         if (ret != (size_t) -1) {
2367                                 line = out_buffer;
2368                                 linelen = strlen(out_buffer);
2369                         }
2370                 }
2371
2372                 if (!view->ops->read(view, line))
2373                         goto alloc_error;
2374
2375                 if (lines-- == 1)
2376                         break;
2377         }
2378
2379         {
2380                 int digits;
2381
2382                 lines = view->lines;
2383                 for (digits = 0; lines; digits++)
2384                         lines /= 10;
2385
2386                 /* Keep the displayed view in sync with line number scaling. */
2387                 if (digits != view->digits) {
2388                         view->digits = digits;
2389                         redraw_from = 0;
2390                 }
2391         }
2392
2393         if (ferror(view->pipe) && errno != 0) {
2394                 report("Failed to read: %s", strerror(errno));
2395                 end_update(view, TRUE);
2396
2397         } else if (feof(view->pipe)) {
2398                 report("");
2399                 end_update(view, FALSE);
2400         }
2401
2402         if (view == VIEW(REQ_VIEW_TREE)) {
2403                 /* Clear the view and redraw everything since the tree sorting
2404                  * might have rearranged things. */
2405                 redraw_view(view);
2406
2407         } else if (redraw_from >= 0) {
2408                 /* If this is an incremental update, redraw the previous line
2409                  * since for commits some members could have changed when
2410                  * loading the main view. */
2411                 if (redraw_from > 0)
2412                         redraw_from--;
2413
2414                 /* Since revision graph visualization requires knowledge
2415                  * about the parent commit, it causes a further one-off
2416                  * needed to be redrawn for incremental updates. */
2417                 if (redraw_from > 0 && opt_rev_graph)
2418                         redraw_from--;
2419
2420                 /* Incrementally draw avoids flickering. */
2421                 redraw_view_from(view, redraw_from);
2422         }
2423
2424         if (view == VIEW(REQ_VIEW_BLAME))
2425                 redraw_view_dirty(view);
2426
2427         /* Update the title _after_ the redraw so that if the redraw picks up a
2428          * commit reference in view->ref it'll be available here. */
2429         update_view_title(view);
2430         return TRUE;
2431
2432 alloc_error:
2433         report("Allocation failure");
2434         end_update(view, TRUE);
2435         return FALSE;
2436 }
2437
2438 static struct line *
2439 add_line_data(struct view *view, void *data, enum line_type type)
2440 {
2441         struct line *line = &view->line[view->lines++];
2442
2443         memset(line, 0, sizeof(*line));
2444         line->type = type;
2445         line->data = data;
2446
2447         return line;
2448 }
2449
2450 static struct line *
2451 add_line_text(struct view *view, const char *text, enum line_type type)
2452 {
2453         char *data = text ? strdup(text) : NULL;
2454
2455         return data ? add_line_data(view, data, type) : NULL;
2456 }
2457
2458
2459 /*
2460  * View opening
2461  */
2462
2463 enum open_flags {
2464         OPEN_DEFAULT = 0,       /* Use default view switching. */
2465         OPEN_SPLIT = 1,         /* Split current view. */
2466         OPEN_BACKGROUNDED = 2,  /* Backgrounded. */
2467         OPEN_RELOAD = 4,        /* Reload view even if it is the current. */
2468         OPEN_NOMAXIMIZE = 8,    /* Do not maximize the current view. */
2469         OPEN_REFRESH = 16,      /* Refresh view using previous command. */
2470 };
2471
2472 static void
2473 open_view(struct view *prev, enum request request, enum open_flags flags)
2474 {
2475         bool backgrounded = !!(flags & OPEN_BACKGROUNDED);
2476         bool split = !!(flags & OPEN_SPLIT);
2477         bool reload = !!(flags & (OPEN_RELOAD | OPEN_REFRESH));
2478         bool nomaximize = !!(flags & (OPEN_NOMAXIMIZE | OPEN_REFRESH));
2479         struct view *view = VIEW(request);
2480         int nviews = displayed_views();
2481         struct view *base_view = display[0];
2482
2483         if (view == prev && nviews == 1 && !reload) {
2484                 report("Already in %s view", view->name);
2485                 return;
2486         }
2487
2488         if (view->git_dir && !opt_git_dir[0]) {
2489                 report("The %s view is disabled in pager view", view->name);
2490                 return;
2491         }
2492
2493         if (split) {
2494                 display[1] = view;
2495                 if (!backgrounded)
2496                         current_view = 1;
2497         } else if (!nomaximize) {
2498                 /* Maximize the current view. */
2499                 memset(display, 0, sizeof(display));
2500                 current_view = 0;
2501                 display[current_view] = view;
2502         }
2503
2504         /* Resize the view when switching between split- and full-screen,
2505          * or when switching between two different full-screen views. */
2506         if (nviews != displayed_views() ||
2507             (nviews == 1 && base_view != display[0]))
2508                 resize_display();
2509
2510         if (view->pipe)
2511                 end_update(view, TRUE);
2512
2513         if (view->ops->open) {
2514                 if (!view->ops->open(view)) {
2515                         report("Failed to load %s view", view->name);
2516                         return;
2517                 }
2518
2519         } else if ((reload || strcmp(view->vid, view->id)) &&
2520                    !begin_update(view, flags & OPEN_REFRESH)) {
2521                 report("Failed to load %s view", view->name);
2522                 return;
2523         }
2524
2525         if (split && prev->lineno - prev->offset >= prev->height) {
2526                 /* Take the title line into account. */
2527                 int lines = prev->lineno - prev->offset - prev->height + 1;
2528
2529                 /* Scroll the view that was split if the current line is
2530                  * outside the new limited view. */
2531                 do_scroll_view(prev, lines);
2532         }
2533
2534         if (prev && view != prev) {
2535                 if (split && !backgrounded) {
2536                         /* "Blur" the previous view. */
2537                         update_view_title(prev);
2538                 }
2539
2540                 view->parent = prev;
2541         }
2542
2543         if (view->pipe && view->lines == 0) {
2544                 /* Clear the old view and let the incremental updating refill
2545                  * the screen. */
2546                 werase(view->win);
2547                 report("");
2548         } else if (view_is_displayed(view)) {
2549                 redraw_view(view);
2550                 report("");
2551         }
2552
2553         /* If the view is backgrounded the above calls to report()
2554          * won't redraw the view title. */
2555         if (backgrounded)
2556                 update_view_title(view);
2557 }
2558
2559 static bool
2560 run_confirm(const char *cmd, const char *prompt)
2561 {
2562         bool confirmation = prompt_yesno(prompt);
2563
2564         if (confirmation)
2565                 system(cmd);
2566
2567         return confirmation;
2568 }
2569
2570 static void
2571 open_external_viewer(const char *cmd)
2572 {
2573         def_prog_mode();           /* save current tty modes */
2574         endwin();                  /* restore original tty modes */
2575         system(cmd);
2576         fprintf(stderr, "Press Enter to continue");
2577         getc(opt_tty);
2578         reset_prog_mode();
2579         redraw_display();
2580 }
2581
2582 static void
2583 open_mergetool(const char *file)
2584 {
2585         char cmd[SIZEOF_STR];
2586         char file_sq[SIZEOF_STR];
2587
2588         if (sq_quote(file_sq, 0, file) < sizeof(file_sq) &&
2589             string_format(cmd, "git mergetool %s", file_sq)) {
2590                 open_external_viewer(cmd);
2591         }
2592 }
2593
2594 static void
2595 open_editor(bool from_root, const char *file)
2596 {
2597         char cmd[SIZEOF_STR];
2598         char file_sq[SIZEOF_STR];
2599         const char *editor;
2600         char *prefix = from_root ? opt_cdup : "";
2601
2602         editor = getenv("GIT_EDITOR");
2603         if (!editor && *opt_editor)
2604                 editor = opt_editor;
2605         if (!editor)
2606                 editor = getenv("VISUAL");
2607         if (!editor)
2608                 editor = getenv("EDITOR");
2609         if (!editor)
2610                 editor = "vi";
2611
2612         if (sq_quote(file_sq, 0, file) < sizeof(file_sq) &&
2613             string_format(cmd, "%s %s%s", editor, prefix, file_sq)) {
2614                 open_external_viewer(cmd);
2615         }
2616 }
2617
2618 static void
2619 open_run_request(enum request request)
2620 {
2621         struct run_request *req = get_run_request(request);
2622         char buf[SIZEOF_STR * 2];
2623         size_t bufpos;
2624         char *cmd;
2625
2626         if (!req) {
2627                 report("Unknown run request");
2628                 return;
2629         }
2630
2631         bufpos = 0;
2632         cmd = req->cmd;
2633
2634         while (cmd) {
2635                 char *next = strstr(cmd, "%(");
2636                 int len = next - cmd;
2637                 char *value;
2638
2639                 if (!next) {
2640                         len = strlen(cmd);
2641                         value = "";
2642
2643                 } else if (!strncmp(next, "%(head)", 7)) {
2644                         value = ref_head;
2645
2646                 } else if (!strncmp(next, "%(commit)", 9)) {
2647                         value = ref_commit;
2648
2649                 } else if (!strncmp(next, "%(blob)", 7)) {
2650                         value = ref_blob;
2651
2652                 } else {
2653                         report("Unknown replacement in run request: `%s`", req->cmd);
2654                         return;
2655                 }
2656
2657                 if (!string_format_from(buf, &bufpos, "%.*s%s", len, cmd, value))
2658                         return;
2659
2660                 if (next)
2661                         next = strchr(next, ')') + 1;
2662                 cmd = next;
2663         }
2664
2665         open_external_viewer(buf);
2666 }
2667
2668 /*
2669  * User request switch noodle
2670  */
2671
2672 static int
2673 view_driver(struct view *view, enum request request)
2674 {
2675         int i;
2676
2677         if (request == REQ_NONE) {
2678                 doupdate();
2679                 return TRUE;
2680         }
2681
2682         if (request > REQ_NONE) {
2683                 open_run_request(request);
2684                 /* FIXME: When all views can refresh always do this. */
2685                 if (view == VIEW(REQ_VIEW_STATUS) ||
2686                     view == VIEW(REQ_VIEW_MAIN) ||
2687                     view == VIEW(REQ_VIEW_LOG) ||
2688                     view == VIEW(REQ_VIEW_STAGE))
2689                         request = REQ_REFRESH;
2690                 else
2691                         return TRUE;
2692         }
2693
2694         if (view && view->lines) {
2695                 request = view->ops->request(view, request, &view->line[view->lineno]);
2696                 if (request == REQ_NONE)
2697                         return TRUE;
2698         }
2699
2700         switch (request) {
2701         case REQ_MOVE_UP:
2702         case REQ_MOVE_DOWN:
2703         case REQ_MOVE_PAGE_UP:
2704         case REQ_MOVE_PAGE_DOWN:
2705         case REQ_MOVE_FIRST_LINE:
2706         case REQ_MOVE_LAST_LINE:
2707                 move_view(view, request);
2708                 break;
2709
2710         case REQ_SCROLL_LINE_DOWN:
2711         case REQ_SCROLL_LINE_UP:
2712         case REQ_SCROLL_PAGE_DOWN:
2713         case REQ_SCROLL_PAGE_UP:
2714                 scroll_view(view, request);
2715                 break;
2716
2717         case REQ_VIEW_BLAME:
2718                 if (!opt_file[0]) {
2719                         report("No file chosen, press %s to open tree view",
2720                                get_key(REQ_VIEW_TREE));
2721                         break;
2722                 }
2723                 open_view(view, request, OPEN_DEFAULT);
2724                 break;
2725
2726         case REQ_VIEW_BLOB:
2727                 if (!ref_blob[0]) {
2728                         report("No file chosen, press %s to open tree view",
2729                                get_key(REQ_VIEW_TREE));
2730                         break;
2731                 }
2732                 open_view(view, request, OPEN_DEFAULT);
2733                 break;
2734
2735         case REQ_VIEW_PAGER:
2736                 if (!opt_pipe && !VIEW(REQ_VIEW_PAGER)->lines) {
2737                         report("No pager content, press %s to run command from prompt",
2738                                get_key(REQ_PROMPT));
2739                         break;
2740                 }
2741                 open_view(view, request, OPEN_DEFAULT);
2742                 break;
2743
2744         case REQ_VIEW_STAGE:
2745                 if (!VIEW(REQ_VIEW_STAGE)->lines) {
2746                         report("No stage content, press %s to open the status view and choose file",
2747                                get_key(REQ_VIEW_STATUS));
2748                         break;
2749                 }
2750                 open_view(view, request, OPEN_DEFAULT);
2751                 break;
2752
2753         case REQ_VIEW_STATUS:
2754                 if (opt_is_inside_work_tree == FALSE) {
2755                         report("The status view requires a working tree");
2756                         break;
2757                 }
2758                 open_view(view, request, OPEN_DEFAULT);
2759                 break;
2760
2761         case REQ_VIEW_MAIN:
2762         case REQ_VIEW_DIFF:
2763         case REQ_VIEW_LOG:
2764         case REQ_VIEW_TREE:
2765         case REQ_VIEW_HELP:
2766                 open_view(view, request, OPEN_DEFAULT);
2767                 break;
2768
2769         case REQ_NEXT:
2770         case REQ_PREVIOUS:
2771                 request = request == REQ_NEXT ? REQ_MOVE_DOWN : REQ_MOVE_UP;
2772
2773                 if ((view == VIEW(REQ_VIEW_DIFF) &&
2774                      view->parent == VIEW(REQ_VIEW_MAIN)) ||
2775                    (view == VIEW(REQ_VIEW_DIFF) &&
2776                      view->parent == VIEW(REQ_VIEW_BLAME)) ||
2777                    (view == VIEW(REQ_VIEW_STAGE) &&
2778                      view->parent == VIEW(REQ_VIEW_STATUS)) ||
2779                    (view == VIEW(REQ_VIEW_BLOB) &&
2780                      view->parent == VIEW(REQ_VIEW_TREE))) {
2781                         int line;
2782
2783                         view = view->parent;
2784                         line = view->lineno;
2785                         move_view(view, request);
2786                         if (view_is_displayed(view))
2787                                 update_view_title(view);
2788                         if (line != view->lineno)
2789                                 view->ops->request(view, REQ_ENTER,
2790                                                    &view->line[view->lineno]);
2791
2792                 } else {
2793                         move_view(view, request);
2794                 }
2795                 break;
2796
2797         case REQ_VIEW_NEXT:
2798         {
2799                 int nviews = displayed_views();
2800                 int next_view = (current_view + 1) % nviews;
2801
2802                 if (next_view == current_view) {
2803                         report("Only one view is displayed");
2804                         break;
2805                 }
2806
2807                 current_view = next_view;
2808                 /* Blur out the title of the previous view. */
2809                 update_view_title(view);
2810                 report("");
2811                 break;
2812         }
2813         case REQ_REFRESH:
2814                 report("Refreshing is not yet supported for the %s view", view->name);
2815                 break;
2816
2817         case REQ_MAXIMIZE:
2818                 if (displayed_views() == 2)
2819                         open_view(view, VIEW_REQ(view), OPEN_DEFAULT);
2820                 break;
2821
2822         case REQ_TOGGLE_LINENO:
2823                 opt_line_number = !opt_line_number;
2824                 redraw_display();
2825                 break;
2826
2827         case REQ_TOGGLE_DATE:
2828                 opt_date = !opt_date;
2829                 redraw_display();
2830                 break;
2831
2832         case REQ_TOGGLE_AUTHOR:
2833                 opt_author = !opt_author;
2834                 redraw_display();
2835                 break;
2836
2837         case REQ_TOGGLE_REV_GRAPH:
2838                 opt_rev_graph = !opt_rev_graph;
2839                 redraw_display();
2840                 break;
2841
2842         case REQ_TOGGLE_REFS:
2843                 opt_show_refs = !opt_show_refs;
2844                 redraw_display();
2845                 break;
2846
2847         case REQ_SEARCH:
2848         case REQ_SEARCH_BACK:
2849                 search_view(view, request);
2850                 break;
2851
2852         case REQ_FIND_NEXT:
2853         case REQ_FIND_PREV:
2854                 find_next(view, request);
2855                 break;
2856
2857         case REQ_STOP_LOADING:
2858                 for (i = 0; i < ARRAY_SIZE(views); i++) {
2859                         view = &views[i];
2860                         if (view->pipe)
2861                                 report("Stopped loading the %s view", view->name),
2862                         end_update(view, TRUE);
2863                 }
2864                 break;
2865
2866         case REQ_SHOW_VERSION:
2867                 report("tig-%s (built %s)", TIG_VERSION, __DATE__);
2868                 return TRUE;
2869
2870         case REQ_SCREEN_RESIZE:
2871                 resize_display();
2872                 /* Fall-through */
2873         case REQ_SCREEN_REDRAW:
2874                 redraw_display();
2875                 break;
2876
2877         case REQ_EDIT:
2878                 report("Nothing to edit");
2879                 break;
2880
2881         case REQ_ENTER:
2882                 report("Nothing to enter");
2883                 break;
2884
2885         case REQ_VIEW_CLOSE:
2886                 /* XXX: Mark closed views by letting view->parent point to the
2887                  * view itself. Parents to closed view should never be
2888                  * followed. */
2889                 if (view->parent &&
2890                     view->parent->parent != view->parent) {
2891                         memset(display, 0, sizeof(display));
2892                         current_view = 0;
2893                         display[current_view] = view->parent;
2894                         view->parent = view;
2895                         resize_display();
2896                         redraw_display();
2897                         report("");
2898                         break;
2899                 }
2900                 /* Fall-through */
2901         case REQ_QUIT:
2902                 return FALSE;
2903
2904         default:
2905                 report("Unknown key, press 'h' for help");
2906                 return TRUE;
2907         }
2908
2909         return TRUE;
2910 }
2911
2912
2913 /*
2914  * Pager backend
2915  */
2916
2917 static bool
2918 pager_draw(struct view *view, struct line *line, unsigned int lineno)
2919 {
2920         char *text = line->data;
2921
2922         if (opt_line_number && draw_lineno(view, lineno))
2923                 return TRUE;
2924
2925         draw_text(view, line->type, text, TRUE);
2926         return TRUE;
2927 }
2928
2929 static bool
2930 add_describe_ref(char *buf, size_t *bufpos, const char *commit_id, const char *sep)
2931 {
2932         char refbuf[SIZEOF_STR];
2933         char *ref = NULL;
2934         FILE *pipe;
2935
2936         if (!string_format(refbuf, "git describe %s 2>/dev/null", commit_id))
2937                 return TRUE;
2938
2939         pipe = popen(refbuf, "r");
2940         if (!pipe)
2941                 return TRUE;
2942
2943         if ((ref = fgets(refbuf, sizeof(refbuf), pipe)))
2944                 ref = chomp_string(ref);
2945         pclose(pipe);
2946
2947         if (!ref || !*ref)
2948                 return TRUE;
2949
2950         /* This is the only fatal call, since it can "corrupt" the buffer. */
2951         if (!string_nformat(buf, SIZEOF_STR, bufpos, "%s%s", sep, ref))
2952                 return FALSE;
2953
2954         return TRUE;
2955 }
2956
2957 static void
2958 add_pager_refs(struct view *view, struct line *line)
2959 {
2960         char buf[SIZEOF_STR];
2961         char *commit_id = (char *)line->data + STRING_SIZE("commit ");
2962         struct ref **refs;
2963         size_t bufpos = 0, refpos = 0;
2964         const char *sep = "Refs: ";
2965         bool is_tag = FALSE;
2966
2967         assert(line->type == LINE_COMMIT);
2968
2969         refs = get_refs(commit_id);
2970         if (!refs) {
2971                 if (view == VIEW(REQ_VIEW_DIFF))
2972                         goto try_add_describe_ref;
2973                 return;
2974         }
2975
2976         do {
2977                 struct ref *ref = refs[refpos];
2978                 const char *fmt = ref->tag    ? "%s[%s]" :
2979                                   ref->remote ? "%s<%s>" : "%s%s";
2980
2981                 if (!string_format_from(buf, &bufpos, fmt, sep, ref->name))
2982                         return;
2983                 sep = ", ";
2984                 if (ref->tag)
2985                         is_tag = TRUE;
2986         } while (refs[refpos++]->next);
2987
2988         if (!is_tag && view == VIEW(REQ_VIEW_DIFF)) {
2989 try_add_describe_ref:
2990                 /* Add <tag>-g<commit_id> "fake" reference. */
2991                 if (!add_describe_ref(buf, &bufpos, commit_id, sep))
2992                         return;
2993         }
2994
2995         if (bufpos == 0)
2996                 return;
2997
2998         if (!realloc_lines(view, view->line_size + 1))
2999                 return;
3000
3001         add_line_text(view, buf, LINE_PP_REFS);
3002 }
3003
3004 static bool
3005 pager_read(struct view *view, char *data)
3006 {
3007         struct line *line;
3008
3009         if (!data)
3010                 return TRUE;
3011
3012         line = add_line_text(view, data, get_line_type(data));
3013         if (!line)
3014                 return FALSE;
3015
3016         if (line->type == LINE_COMMIT &&
3017             (view == VIEW(REQ_VIEW_DIFF) ||
3018              view == VIEW(REQ_VIEW_LOG)))
3019                 add_pager_refs(view, line);
3020
3021         return TRUE;
3022 }
3023
3024 static enum request
3025 pager_request(struct view *view, enum request request, struct line *line)
3026 {
3027         int split = 0;
3028
3029         if (request != REQ_ENTER)
3030                 return request;
3031
3032         if (line->type == LINE_COMMIT &&
3033            (view == VIEW(REQ_VIEW_LOG) ||
3034             view == VIEW(REQ_VIEW_PAGER))) {
3035                 open_view(view, REQ_VIEW_DIFF, OPEN_SPLIT);
3036                 split = 1;
3037         }
3038
3039         /* Always scroll the view even if it was split. That way
3040          * you can use Enter to scroll through the log view and
3041          * split open each commit diff. */
3042         scroll_view(view, REQ_SCROLL_LINE_DOWN);
3043
3044         /* FIXME: A minor workaround. Scrolling the view will call report("")
3045          * but if we are scrolling a non-current view this won't properly
3046          * update the view title. */
3047         if (split)
3048                 update_view_title(view);
3049
3050         return REQ_NONE;
3051 }
3052
3053 static bool
3054 pager_grep(struct view *view, struct line *line)
3055 {
3056         regmatch_t pmatch;
3057         char *text = line->data;
3058
3059         if (!*text)
3060                 return FALSE;
3061
3062         if (regexec(view->regex, text, 1, &pmatch, 0) == REG_NOMATCH)
3063                 return FALSE;
3064
3065         return TRUE;
3066 }
3067
3068 static void
3069 pager_select(struct view *view, struct line *line)
3070 {
3071         if (line->type == LINE_COMMIT) {
3072                 char *text = (char *)line->data + STRING_SIZE("commit ");
3073
3074                 if (view != VIEW(REQ_VIEW_PAGER))
3075                         string_copy_rev(view->ref, text);
3076                 string_copy_rev(ref_commit, text);
3077         }
3078 }
3079
3080 static struct view_ops pager_ops = {
3081         "line",
3082         NULL,
3083         pager_read,
3084         pager_draw,
3085         pager_request,
3086         pager_grep,
3087         pager_select,
3088 };
3089
3090 static enum request
3091 log_request(struct view *view, enum request request, struct line *line)
3092 {
3093         switch (request) {
3094         case REQ_REFRESH:
3095                 load_refs();
3096                 open_view(view, REQ_VIEW_LOG, OPEN_REFRESH);
3097                 return REQ_NONE;
3098         default:
3099                 return pager_request(view, request, line);
3100         }
3101 }
3102
3103 static struct view_ops log_ops = {
3104         "line",
3105         NULL,
3106         pager_read,
3107         pager_draw,
3108         log_request,
3109         pager_grep,
3110         pager_select,
3111 };
3112
3113
3114 /*
3115  * Help backend
3116  */
3117
3118 static bool
3119 help_open(struct view *view)
3120 {
3121         char buf[BUFSIZ];
3122         int lines = ARRAY_SIZE(req_info) + 2;
3123         int i;
3124
3125         if (view->lines > 0)
3126                 return TRUE;
3127
3128         for (i = 0; i < ARRAY_SIZE(req_info); i++)
3129                 if (!req_info[i].request)
3130                         lines++;
3131
3132         lines += run_requests + 1;
3133
3134         view->line = calloc(lines, sizeof(*view->line));
3135         if (!view->line)
3136                 return FALSE;
3137
3138         add_line_text(view, "Quick reference for tig keybindings:", LINE_DEFAULT);
3139
3140         for (i = 0; i < ARRAY_SIZE(req_info); i++) {
3141                 const char *key;
3142
3143                 if (req_info[i].request == REQ_NONE)
3144                         continue;
3145
3146                 if (!req_info[i].request) {
3147                         add_line_text(view, "", LINE_DEFAULT);
3148                         add_line_text(view, req_info[i].help, LINE_DEFAULT);
3149                         continue;
3150                 }
3151
3152                 key = get_key(req_info[i].request);
3153                 if (!*key)
3154                         key = "(no key defined)";
3155
3156                 if (!string_format(buf, "    %-25s %s", key, req_info[i].help))
3157                         continue;
3158
3159                 add_line_text(view, buf, LINE_DEFAULT);
3160         }
3161
3162         if (run_requests) {
3163                 add_line_text(view, "", LINE_DEFAULT);
3164                 add_line_text(view, "External commands:", LINE_DEFAULT);
3165         }
3166
3167         for (i = 0; i < run_requests; i++) {
3168                 struct run_request *req = get_run_request(REQ_NONE + i + 1);
3169                 const char *key;
3170
3171                 if (!req)
3172                         continue;
3173
3174                 key = get_key_name(req->key);
3175                 if (!*key)
3176                         key = "(no key defined)";
3177
3178                 if (!string_format(buf, "    %-10s %-14s `%s`",
3179                                    keymap_table[req->keymap].name,
3180                                    key, req->cmd))
3181                         continue;
3182
3183                 add_line_text(view, buf, LINE_DEFAULT);
3184         }
3185
3186         return TRUE;
3187 }
3188
3189 static struct view_ops help_ops = {
3190         "line",
3191         help_open,
3192         NULL,
3193         pager_draw,
3194         pager_request,
3195         pager_grep,
3196         pager_select,
3197 };
3198
3199
3200 /*
3201  * Tree backend
3202  */
3203
3204 struct tree_stack_entry {
3205         struct tree_stack_entry *prev;  /* Entry below this in the stack */
3206         unsigned long lineno;           /* Line number to restore */
3207         char *name;                     /* Position of name in opt_path */
3208 };
3209
3210 /* The top of the path stack. */
3211 static struct tree_stack_entry *tree_stack = NULL;
3212 unsigned long tree_lineno = 0;
3213
3214 static void
3215 pop_tree_stack_entry(void)
3216 {
3217         struct tree_stack_entry *entry = tree_stack;
3218
3219         tree_lineno = entry->lineno;
3220         entry->name[0] = 0;
3221         tree_stack = entry->prev;
3222         free(entry);
3223 }
3224
3225 static void
3226 push_tree_stack_entry(const char *name, unsigned long lineno)
3227 {
3228         struct tree_stack_entry *entry = calloc(1, sizeof(*entry));
3229         size_t pathlen = strlen(opt_path);
3230
3231         if (!entry)
3232                 return;
3233
3234         entry->prev = tree_stack;
3235         entry->name = opt_path + pathlen;
3236         tree_stack = entry;
3237
3238         if (!string_format_from(opt_path, &pathlen, "%s/", name)) {
3239                 pop_tree_stack_entry();
3240                 return;
3241         }
3242
3243         /* Move the current line to the first tree entry. */
3244         tree_lineno = 1;
3245         entry->lineno = lineno;
3246 }
3247
3248 /* Parse output from git-ls-tree(1):
3249  *
3250  * 100644 blob fb0e31ea6cc679b7379631188190e975f5789c26 Makefile
3251  * 100644 blob 5304ca4260aaddaee6498f9630e7d471b8591ea6 README
3252  * 100644 blob f931e1d229c3e185caad4449bf5b66ed72462657 tig.c
3253  * 100644 blob ed09fe897f3c7c9af90bcf80cae92558ea88ae38 web.conf
3254  */
3255
3256 #define SIZEOF_TREE_ATTR \
3257         STRING_SIZE("100644 blob ed09fe897f3c7c9af90bcf80cae92558ea88ae38\t")
3258
3259 #define TREE_UP_FORMAT "040000 tree %s\t.."
3260
3261 static int
3262 tree_compare_entry(enum line_type type1, const char *name1,
3263                    enum line_type type2, const char *name2)
3264 {
3265         if (type1 != type2) {
3266                 if (type1 == LINE_TREE_DIR)
3267                         return -1;
3268                 return 1;
3269         }
3270
3271         return strcmp(name1, name2);
3272 }
3273
3274 static const char *
3275 tree_path(struct line *line)
3276 {
3277         const char *path = line->data;
3278
3279         return path + SIZEOF_TREE_ATTR;
3280 }
3281
3282 static bool
3283 tree_read(struct view *view, char *text)
3284 {
3285         size_t textlen = text ? strlen(text) : 0;
3286         char buf[SIZEOF_STR];
3287         unsigned long pos;
3288         enum line_type type;
3289         bool first_read = view->lines == 0;
3290
3291         if (!text)
3292                 return TRUE;
3293         if (textlen <= SIZEOF_TREE_ATTR)
3294                 return FALSE;
3295
3296         type = text[STRING_SIZE("100644 ")] == 't'
3297              ? LINE_TREE_DIR : LINE_TREE_FILE;
3298
3299         if (first_read) {
3300                 /* Add path info line */
3301                 if (!string_format(buf, "Directory path /%s", opt_path) ||
3302                     !realloc_lines(view, view->line_size + 1) ||
3303                     !add_line_text(view, buf, LINE_DEFAULT))
3304                         return FALSE;
3305
3306                 /* Insert "link" to parent directory. */
3307                 if (*opt_path) {
3308                         if (!string_format(buf, TREE_UP_FORMAT, view->ref) ||
3309                             !realloc_lines(view, view->line_size + 1) ||
3310                             !add_line_text(view, buf, LINE_TREE_DIR))
3311                                 return FALSE;
3312                 }
3313         }
3314
3315         /* Strip the path part ... */
3316         if (*opt_path) {
3317                 size_t pathlen = textlen - SIZEOF_TREE_ATTR;
3318                 size_t striplen = strlen(opt_path);
3319                 char *path = text + SIZEOF_TREE_ATTR;
3320
3321                 if (pathlen > striplen)
3322                         memmove(path, path + striplen,
3323                                 pathlen - striplen + 1);
3324         }
3325
3326         /* Skip "Directory ..." and ".." line. */
3327         for (pos = 1 + !!*opt_path; pos < view->lines; pos++) {
3328                 struct line *line = &view->line[pos];
3329                 const char *path1 = tree_path(line);
3330                 char *path2 = text + SIZEOF_TREE_ATTR;
3331                 int cmp = tree_compare_entry(line->type, path1, type, path2);
3332
3333                 if (cmp <= 0)
3334                         continue;
3335
3336                 text = strdup(text);
3337                 if (!text)
3338                         return FALSE;
3339
3340                 if (view->lines > pos)
3341                         memmove(&view->line[pos + 1], &view->line[pos],
3342                                 (view->lines - pos) * sizeof(*line));
3343
3344                 line = &view->line[pos];
3345                 line->data = text;
3346                 line->type = type;
3347                 view->lines++;
3348                 return TRUE;
3349         }
3350
3351         if (!add_line_text(view, text, type))
3352                 return FALSE;
3353
3354         if (tree_lineno > view->lineno) {
3355                 view->lineno = tree_lineno;
3356                 tree_lineno = 0;
3357         }
3358
3359         return TRUE;
3360 }
3361
3362 static enum request
3363 tree_request(struct view *view, enum request request, struct line *line)
3364 {
3365         enum open_flags flags;
3366
3367         switch (request) {
3368         case REQ_VIEW_BLAME:
3369                 if (line->type != LINE_TREE_FILE) {
3370                         report("Blame only supported for files");
3371                         return REQ_NONE;
3372                 }
3373
3374                 string_copy(opt_ref, view->vid);
3375                 string_format(opt_file, "%s%s", opt_path, tree_path(line));
3376                 return request;
3377
3378         case REQ_TREE_PARENT:
3379                 if (!*opt_path) {
3380                         /* quit view if at top of tree */
3381                         return REQ_VIEW_CLOSE;
3382                 }
3383                 /* fake 'cd  ..' */
3384                 line = &view->line[1];
3385                 break;
3386
3387         case REQ_ENTER:
3388                 break;
3389
3390         default:
3391                 return request;
3392         }
3393
3394         /* Cleanup the stack if the tree view is at a different tree. */
3395         while (!*opt_path && tree_stack)
3396                 pop_tree_stack_entry();
3397
3398         switch (line->type) {
3399         case LINE_TREE_DIR:
3400                 /* Depending on whether it is a subdir or parent (updir?) link
3401                  * mangle the path buffer. */
3402                 if (line == &view->line[1] && *opt_path) {
3403                         pop_tree_stack_entry();
3404
3405                 } else {
3406                         const char *basename = tree_path(line);
3407
3408                         push_tree_stack_entry(basename, view->lineno);
3409                 }
3410
3411                 /* Trees and subtrees share the same ID, so they are not not
3412                  * unique like blobs. */
3413                 flags = OPEN_RELOAD;
3414                 request = REQ_VIEW_TREE;
3415                 break;
3416
3417         case LINE_TREE_FILE:
3418                 flags = display[0] == view ? OPEN_SPLIT : OPEN_DEFAULT;
3419                 request = REQ_VIEW_BLOB;
3420                 break;
3421
3422         default:
3423                 return TRUE;
3424         }
3425
3426         open_view(view, request, flags);
3427         if (request == REQ_VIEW_TREE) {
3428                 view->lineno = tree_lineno;
3429         }
3430
3431         return REQ_NONE;
3432 }
3433
3434 static void
3435 tree_select(struct view *view, struct line *line)
3436 {
3437         char *text = (char *)line->data + STRING_SIZE("100644 blob ");
3438
3439         if (line->type == LINE_TREE_FILE) {
3440                 string_copy_rev(ref_blob, text);
3441
3442         } else if (line->type != LINE_TREE_DIR) {
3443                 return;
3444         }
3445
3446         string_copy_rev(view->ref, text);
3447 }
3448
3449 static struct view_ops tree_ops = {
3450         "file",
3451         NULL,
3452         tree_read,
3453         pager_draw,
3454         tree_request,
3455         pager_grep,
3456         tree_select,
3457 };
3458
3459 static bool
3460 blob_read(struct view *view, char *line)
3461 {
3462         if (!line)
3463                 return TRUE;
3464         return add_line_text(view, line, LINE_DEFAULT) != NULL;
3465 }
3466
3467 static struct view_ops blob_ops = {
3468         "line",
3469         NULL,
3470         blob_read,
3471         pager_draw,
3472         pager_request,
3473         pager_grep,
3474         pager_select,
3475 };
3476
3477 /*
3478  * Blame backend
3479  *
3480  * Loading the blame view is a two phase job:
3481  *
3482  *  1. File content is read either using opt_file from the
3483  *     filesystem or using git-cat-file.
3484  *  2. Then blame information is incrementally added by
3485  *     reading output from git-blame.
3486  */
3487
3488 struct blame_commit {
3489         char id[SIZEOF_REV];            /* SHA1 ID. */
3490         char title[128];                /* First line of the commit message. */
3491         char author[75];                /* Author of the commit. */
3492         struct tm time;                 /* Date from the author ident. */
3493         char filename[128];             /* Name of file. */
3494 };
3495
3496 struct blame {
3497         struct blame_commit *commit;
3498         unsigned int header:1;
3499         char text[1];
3500 };
3501
3502 #define BLAME_CAT_FILE_CMD "git cat-file blob %s:%s"
3503 #define BLAME_INCREMENTAL_CMD "git blame --incremental %s -- %s"
3504
3505 static bool
3506 blame_open(struct view *view)
3507 {
3508         char path[SIZEOF_STR];
3509         char ref[SIZEOF_STR] = "";
3510
3511         if (sq_quote(path, 0, opt_file) >= sizeof(path))
3512                 return FALSE;
3513
3514         if (*opt_ref && sq_quote(ref, 0, opt_ref) >= sizeof(ref))
3515                 return FALSE;
3516
3517         if (*opt_ref) {
3518                 if (!string_format(view->cmd, BLAME_CAT_FILE_CMD, ref, path))
3519                         return FALSE;
3520         } else {
3521                 view->pipe = fopen(opt_file, "r");
3522                 if (!view->pipe &&
3523                     !string_format(view->cmd, BLAME_CAT_FILE_CMD, "HEAD", path))
3524                         return FALSE;
3525         }
3526
3527         if (!view->pipe)
3528                 view->pipe = popen(view->cmd, "r");
3529         if (!view->pipe)
3530                 return FALSE;
3531
3532         if (!string_format(view->cmd, BLAME_INCREMENTAL_CMD, ref, path))
3533                 return FALSE;
3534
3535         reset_view(view);
3536         string_format(view->ref, "%s ...", opt_file);
3537         string_copy_rev(view->vid, opt_file);
3538         set_nonblocking_input(TRUE);
3539         view->start_time = time(NULL);
3540
3541         return TRUE;
3542 }
3543
3544 static struct blame_commit *
3545 get_blame_commit(struct view *view, const char *id)
3546 {
3547         size_t i;
3548
3549         for (i = 0; i < view->lines; i++) {
3550                 struct blame *blame = view->line[i].data;
3551
3552                 if (!blame->commit)
3553                         continue;
3554
3555                 if (!strncmp(blame->commit->id, id, SIZEOF_REV - 1))
3556                         return blame->commit;
3557         }
3558
3559         {
3560                 struct blame_commit *commit = calloc(1, sizeof(*commit));
3561
3562                 if (commit)
3563                         string_ncopy(commit->id, id, SIZEOF_REV);
3564                 return commit;
3565         }
3566 }
3567
3568 static bool
3569 parse_number(const char **posref, size_t *number, size_t min, size_t max)
3570 {
3571         const char *pos = *posref;
3572
3573         *posref = NULL;
3574         pos = strchr(pos + 1, ' ');
3575         if (!pos || !isdigit(pos[1]))
3576                 return FALSE;
3577         *number = atoi(pos + 1);
3578         if (*number < min || *number > max)
3579                 return FALSE;
3580
3581         *posref = pos;
3582         return TRUE;
3583 }
3584
3585 static struct blame_commit *
3586 parse_blame_commit(struct view *view, const char *text, int *blamed)
3587 {
3588         struct blame_commit *commit;
3589         struct blame *blame;
3590         const char *pos = text + SIZEOF_REV - 1;
3591         size_t lineno;
3592         size_t group;
3593
3594         if (strlen(text) <= SIZEOF_REV || *pos != ' ')
3595                 return NULL;
3596
3597         if (!parse_number(&pos, &lineno, 1, view->lines) ||
3598             !parse_number(&pos, &group, 1, view->lines - lineno + 1))
3599                 return NULL;
3600
3601         commit = get_blame_commit(view, text);
3602         if (!commit)
3603                 return NULL;
3604
3605         *blamed += group;
3606         while (group--) {
3607                 struct line *line = &view->line[lineno + group - 1];
3608
3609                 blame = line->data;
3610                 blame->commit = commit;
3611                 blame->header = !group;
3612                 line->dirty = 1;
3613         }
3614
3615         return commit;
3616 }
3617
3618 static bool
3619 blame_read_file(struct view *view, const char *line)
3620 {
3621         if (!line) {
3622                 FILE *pipe = NULL;
3623
3624                 if (view->lines > 0)
3625                         pipe = popen(view->cmd, "r");
3626                 else if (!view->parent)
3627                         die("No blame exist for %s", view->vid);
3628                 view->cmd[0] = 0;
3629                 if (!pipe) {
3630                         report("Failed to load blame data");
3631                         return TRUE;
3632                 }
3633
3634                 fclose(view->pipe);
3635                 view->pipe = pipe;
3636                 return FALSE;
3637
3638         } else {
3639                 size_t linelen = strlen(line);
3640                 struct blame *blame = malloc(sizeof(*blame) + linelen);
3641
3642                 blame->commit = NULL;
3643                 strncpy(blame->text, line, linelen);
3644                 blame->text[linelen] = 0;
3645                 return add_line_data(view, blame, LINE_BLAME_ID) != NULL;
3646         }
3647 }
3648
3649 static bool
3650 match_blame_header(const char *name, char **line)
3651 {
3652         size_t namelen = strlen(name);
3653         bool matched = !strncmp(name, *line, namelen);
3654
3655         if (matched)
3656                 *line += namelen;
3657
3658         return matched;
3659 }
3660
3661 static bool
3662 blame_read(struct view *view, char *line)
3663 {
3664         static struct blame_commit *commit = NULL;
3665         static int blamed = 0;
3666         static time_t author_time;
3667
3668         if (*view->cmd)
3669                 return blame_read_file(view, line);
3670
3671         if (!line) {
3672                 /* Reset all! */
3673                 commit = NULL;
3674                 blamed = 0;
3675                 string_format(view->ref, "%s", view->vid);
3676                 if (view_is_displayed(view)) {
3677                         update_view_title(view);
3678                         redraw_view_from(view, 0);
3679                 }
3680                 return TRUE;
3681         }
3682
3683         if (!commit) {
3684                 commit = parse_blame_commit(view, line, &blamed);
3685                 string_format(view->ref, "%s %2d%%", view->vid,
3686                               blamed * 100 / view->lines);
3687
3688         } else if (match_blame_header("author ", &line)) {
3689                 string_ncopy(commit->author, line, strlen(line));
3690
3691         } else if (match_blame_header("author-time ", &line)) {
3692                 author_time = (time_t) atol(line);
3693
3694         } else if (match_blame_header("author-tz ", &line)) {
3695                 long tz;
3696
3697                 tz  = ('0' - line[1]) * 60 * 60 * 10;
3698                 tz += ('0' - line[2]) * 60 * 60;
3699                 tz += ('0' - line[3]) * 60;
3700                 tz += ('0' - line[4]) * 60;
3701
3702                 if (line[0] == '-')
3703                         tz = -tz;
3704
3705                 author_time -= tz;
3706                 gmtime_r(&author_time, &commit->time);
3707
3708         } else if (match_blame_header("summary ", &line)) {
3709                 string_ncopy(commit->title, line, strlen(line));
3710
3711         } else if (match_blame_header("filename ", &line)) {
3712                 string_ncopy(commit->filename, line, strlen(line));
3713                 commit = NULL;
3714         }
3715
3716         return TRUE;
3717 }
3718
3719 static bool
3720 blame_draw(struct view *view, struct line *line, unsigned int lineno)
3721 {
3722         struct blame *blame = line->data;
3723         struct tm *time = NULL;
3724         const char *id = NULL, *author = NULL;
3725
3726         if (blame->commit && *blame->commit->filename) {
3727                 id = blame->commit->id;
3728                 author = blame->commit->author;
3729                 time = &blame->commit->time;
3730         }
3731
3732         if (opt_date && draw_date(view, time))
3733                 return TRUE;
3734
3735         if (opt_author &&
3736             draw_field(view, LINE_MAIN_AUTHOR, author, opt_author_cols, TRUE))
3737                 return TRUE;
3738
3739         if (draw_field(view, LINE_BLAME_ID, id, ID_COLS, FALSE))
3740                 return TRUE;
3741
3742         if (draw_lineno(view, lineno))
3743                 return TRUE;
3744
3745         draw_text(view, LINE_DEFAULT, blame->text, TRUE);
3746         return TRUE;
3747 }
3748
3749 static enum request
3750 blame_request(struct view *view, enum request request, struct line *line)
3751 {
3752         enum open_flags flags = display[0] == view ? OPEN_SPLIT : OPEN_DEFAULT;
3753         struct blame *blame = line->data;
3754
3755         switch (request) {
3756         case REQ_ENTER:
3757                 if (!blame->commit) {
3758                         report("No commit loaded yet");
3759                         break;
3760                 }
3761
3762                 if (!strcmp(blame->commit->id, NULL_ID)) {
3763                         char path[SIZEOF_STR];
3764
3765                         if (sq_quote(path, 0, view->vid) >= sizeof(path))
3766                                 break;
3767                         string_format(opt_cmd, "git diff-index --root --patch-with-stat -C -M --cached HEAD -- %s 2>/dev/null", path);
3768                 }
3769
3770                 open_view(view, REQ_VIEW_DIFF, flags);
3771                 break;
3772
3773         default:
3774                 return request;
3775         }
3776
3777         return REQ_NONE;
3778 }
3779
3780 static bool
3781 blame_grep(struct view *view, struct line *line)
3782 {
3783         struct blame *blame = line->data;
3784         struct blame_commit *commit = blame->commit;
3785         regmatch_t pmatch;
3786
3787 #define MATCH(text, on)                                                 \
3788         (on && *text && regexec(view->regex, text, 1, &pmatch, 0) != REG_NOMATCH)
3789
3790         if (commit) {
3791                 char buf[DATE_COLS + 1];
3792
3793                 if (MATCH(commit->title, 1) ||
3794                     MATCH(commit->author, opt_author) ||
3795                     MATCH(commit->id, opt_date))
3796                         return TRUE;
3797
3798                 if (strftime(buf, sizeof(buf), DATE_FORMAT, &commit->time) &&
3799                     MATCH(buf, 1))
3800                         return TRUE;
3801         }
3802
3803         return MATCH(blame->text, 1);
3804
3805 #undef MATCH
3806 }
3807
3808 static void
3809 blame_select(struct view *view, struct line *line)
3810 {
3811         struct blame *blame = line->data;
3812         struct blame_commit *commit = blame->commit;
3813
3814         if (!commit)
3815                 return;
3816
3817         if (!strcmp(commit->id, NULL_ID))
3818                 string_ncopy(ref_commit, "HEAD", 4);
3819         else
3820                 string_copy_rev(ref_commit, commit->id);
3821 }
3822
3823 static struct view_ops blame_ops = {
3824         "line",
3825         blame_open,
3826         blame_read,
3827         blame_draw,
3828         blame_request,
3829         blame_grep,
3830         blame_select,
3831 };
3832
3833 /*
3834  * Status backend
3835  */
3836
3837 struct status {
3838         char status;
3839         struct {
3840                 mode_t mode;
3841                 char rev[SIZEOF_REV];
3842                 char name[SIZEOF_STR];
3843         } old;
3844         struct {
3845                 mode_t mode;
3846                 char rev[SIZEOF_REV];
3847                 char name[SIZEOF_STR];
3848         } new;
3849 };
3850
3851 static char status_onbranch[SIZEOF_STR];
3852 static struct status stage_status;
3853 static enum line_type stage_line_type;
3854 static size_t stage_chunks;
3855 static int *stage_chunk;
3856
3857 /* This should work even for the "On branch" line. */
3858 static inline bool
3859 status_has_none(struct view *view, struct line *line)
3860 {
3861         return line < view->line + view->lines && !line[1].data;
3862 }
3863
3864 /* Get fields from the diff line:
3865  * :100644 100644 06a5d6ae9eca55be2e0e585a152e6b1336f2b20e 0000000000000000000000000000000000000000 M
3866  */
3867 static inline bool
3868 status_get_diff(struct status *file, const char *buf, size_t bufsize)
3869 {
3870         const char *old_mode = buf +  1;
3871         const char *new_mode = buf +  8;
3872         const char *old_rev  = buf + 15;
3873         const char *new_rev  = buf + 56;
3874         const char *status   = buf + 97;
3875
3876         if (bufsize < 99 ||
3877             old_mode[-1] != ':' ||
3878             new_mode[-1] != ' ' ||
3879             old_rev[-1]  != ' ' ||
3880             new_rev[-1]  != ' ' ||
3881             status[-1]   != ' ')
3882                 return FALSE;
3883
3884         file->status = *status;
3885
3886         string_copy_rev(file->old.rev, old_rev);
3887         string_copy_rev(file->new.rev, new_rev);
3888
3889         file->old.mode = strtoul(old_mode, NULL, 8);
3890         file->new.mode = strtoul(new_mode, NULL, 8);
3891
3892         file->old.name[0] = file->new.name[0] = 0;
3893
3894         return TRUE;
3895 }
3896
3897 static bool
3898 status_run(struct view *view, const char cmd[], char status, enum line_type type)
3899 {
3900         struct status *file = NULL;
3901         struct status *unmerged = NULL;
3902         char buf[SIZEOF_STR * 4];
3903         size_t bufsize = 0;
3904         FILE *pipe;
3905
3906         pipe = popen(cmd, "r");
3907         if (!pipe)
3908                 return FALSE;
3909
3910         add_line_data(view, NULL, type);
3911
3912         while (!feof(pipe) && !ferror(pipe)) {
3913                 char *sep;
3914                 size_t readsize;
3915
3916                 readsize = fread(buf + bufsize, 1, sizeof(buf) - bufsize, pipe);
3917                 if (!readsize)
3918                         break;
3919                 bufsize += readsize;
3920
3921                 /* Process while we have NUL chars. */
3922                 while ((sep = memchr(buf, 0, bufsize))) {
3923                         size_t sepsize = sep - buf + 1;
3924
3925                         if (!file) {
3926                                 if (!realloc_lines(view, view->line_size + 1))
3927                                         goto error_out;
3928
3929                                 file = calloc(1, sizeof(*file));
3930                                 if (!file)
3931                                         goto error_out;
3932
3933                                 add_line_data(view, file, type);
3934                         }
3935
3936                         /* Parse diff info part. */
3937                         if (status) {
3938                                 file->status = status;
3939                                 if (status == 'A')
3940                                         string_copy(file->old.rev, NULL_ID);
3941
3942                         } else if (!file->status) {
3943                                 if (!status_get_diff(file, buf, sepsize))
3944                                         goto error_out;
3945
3946                                 bufsize -= sepsize;
3947                                 memmove(buf, sep + 1, bufsize);
3948
3949                                 sep = memchr(buf, 0, bufsize);
3950                                 if (!sep)
3951                                         break;
3952                                 sepsize = sep - buf + 1;
3953
3954                                 /* Collapse all 'M'odified entries that
3955                                  * follow a associated 'U'nmerged entry.
3956                                  */
3957                                 if (file->status == 'U') {
3958                                         unmerged = file;
3959
3960                                 } else if (unmerged) {
3961                                         int collapse = !strcmp(buf, unmerged->new.name);
3962
3963                                         unmerged = NULL;
3964                                         if (collapse) {
3965                                                 free(file);
3966                                                 view->lines--;
3967                                                 continue;
3968                                         }
3969                                 }
3970                         }
3971
3972                         /* Grab the old name for rename/copy. */
3973                         if (!*file->old.name &&
3974                             (file->status == 'R' || file->status == 'C')) {
3975                                 sepsize = sep - buf + 1;
3976                                 string_ncopy(file->old.name, buf, sepsize);
3977                                 bufsize -= sepsize;
3978                                 memmove(buf, sep + 1, bufsize);
3979
3980                                 sep = memchr(buf, 0, bufsize);
3981                                 if (!sep)
3982                                         break;
3983                                 sepsize = sep - buf + 1;
3984                         }
3985
3986                         /* git-ls-files just delivers a NUL separated
3987                          * list of file names similar to the second half
3988                          * of the git-diff-* output. */
3989                         string_ncopy(file->new.name, buf, sepsize);
3990                         if (!*file->old.name)
3991                                 string_copy(file->old.name, file->new.name);
3992                         bufsize -= sepsize;
3993                         memmove(buf, sep + 1, bufsize);
3994                         file = NULL;
3995                 }
3996         }
3997
3998         if (ferror(pipe)) {
3999 error_out:
4000                 pclose(pipe);
4001                 return FALSE;
4002         }
4003
4004         if (!view->line[view->lines - 1].data)
4005                 add_line_data(view, NULL, LINE_STAT_NONE);
4006
4007         pclose(pipe);
4008         return TRUE;
4009 }
4010
4011 /* Don't show unmerged entries in the staged section. */
4012 #define STATUS_DIFF_INDEX_CMD "git diff-index -z --diff-filter=ACDMRTXB --cached -M HEAD"
4013 #define STATUS_DIFF_FILES_CMD "git diff-files -z"
4014 #define STATUS_LIST_OTHER_CMD \
4015         "git ls-files -z --others --exclude-standard"
4016 #define STATUS_LIST_NO_HEAD_CMD \
4017         "git ls-files -z --cached --exclude-standard"
4018
4019 #define STATUS_DIFF_INDEX_SHOW_CMD \
4020         "git diff-index --root --patch-with-stat -C -M --cached HEAD -- %s %s 2>/dev/null"
4021
4022 #define STATUS_DIFF_FILES_SHOW_CMD \
4023         "git diff-files --root --patch-with-stat -C -M -- %s %s 2>/dev/null"
4024
4025 #define STATUS_DIFF_NO_HEAD_SHOW_CMD \
4026         "git diff --no-color --patch-with-stat /dev/null %s 2>/dev/null"
4027
4028 /* First parse staged info using git-diff-index(1), then parse unstaged
4029  * info using git-diff-files(1), and finally untracked files using
4030  * git-ls-files(1). */
4031 static bool
4032 status_open(struct view *view)
4033 {
4034         unsigned long prev_lineno = view->lineno;
4035
4036         reset_view(view);
4037
4038         if (!realloc_lines(view, view->line_size + 7))
4039                 return FALSE;
4040
4041         add_line_data(view, NULL, LINE_STAT_HEAD);
4042         if (is_initial_commit())
4043                 string_copy(status_onbranch, "Initial commit");
4044         else if (!*opt_head)
4045                 string_copy(status_onbranch, "Not currently on any branch");
4046         else if (!string_format(status_onbranch, "On branch %s", opt_head))
4047                 return FALSE;
4048
4049         system("git update-index -q --refresh >/dev/null 2>/dev/null");
4050
4051         if (is_initial_commit()) {
4052                 if (!status_run(view, STATUS_LIST_NO_HEAD_CMD, 'A', LINE_STAT_STAGED))
4053                         return FALSE;
4054         } else if (!status_run(view, STATUS_DIFF_INDEX_CMD, 0, LINE_STAT_STAGED)) {
4055                 return FALSE;
4056         }
4057
4058         if (!status_run(view, STATUS_DIFF_FILES_CMD, 0, LINE_STAT_UNSTAGED) ||
4059             !status_run(view, STATUS_LIST_OTHER_CMD, '?', LINE_STAT_UNTRACKED))
4060                 return FALSE;
4061
4062         /* If all went well restore the previous line number to stay in
4063          * the context or select a line with something that can be
4064          * updated. */
4065         if (prev_lineno >= view->lines)
4066                 prev_lineno = view->lines - 1;
4067         while (prev_lineno < view->lines && !view->line[prev_lineno].data)
4068                 prev_lineno++;
4069         while (prev_lineno > 0 && !view->line[prev_lineno].data)
4070                 prev_lineno--;
4071
4072         /* If the above fails, always skip the "On branch" line. */
4073         if (prev_lineno < view->lines)
4074                 view->lineno = prev_lineno;
4075         else
4076                 view->lineno = 1;
4077
4078         if (view->lineno < view->offset)
4079                 view->offset = view->lineno;
4080         else if (view->offset + view->height <= view->lineno)
4081                 view->offset = view->lineno - view->height + 1;
4082
4083         return TRUE;
4084 }
4085
4086 static bool
4087 status_draw(struct view *view, struct line *line, unsigned int lineno)
4088 {
4089         struct status *status = line->data;
4090         enum line_type type;
4091         const char *text;
4092
4093         if (!status) {
4094                 switch (line->type) {
4095                 case LINE_STAT_STAGED:
4096                         type = LINE_STAT_SECTION;
4097                         text = "Changes to be committed:";
4098                         break;
4099
4100                 case LINE_STAT_UNSTAGED:
4101                         type = LINE_STAT_SECTION;
4102                         text = "Changed but not updated:";
4103                         break;
4104
4105                 case LINE_STAT_UNTRACKED:
4106                         type = LINE_STAT_SECTION;
4107                         text = "Untracked files:";
4108                         break;
4109
4110                 case LINE_STAT_NONE:
4111                         type = LINE_DEFAULT;
4112                         text = "    (no files)";
4113                         break;
4114
4115                 case LINE_STAT_HEAD:
4116                         type = LINE_STAT_HEAD;
4117                         text = status_onbranch;
4118                         break;
4119
4120                 default:
4121                         return FALSE;
4122                 }
4123         } else {
4124                 static char buf[] = { '?', ' ', ' ', ' ', 0 };
4125
4126                 buf[0] = status->status;
4127                 if (draw_text(view, line->type, buf, TRUE))
4128                         return TRUE;
4129                 type = LINE_DEFAULT;
4130                 text = status->new.name;
4131         }
4132
4133         draw_text(view, type, text, TRUE);
4134         return TRUE;
4135 }
4136
4137 static enum request
4138 status_enter(struct view *view, struct line *line)
4139 {
4140         struct status *status = line->data;
4141         char oldpath[SIZEOF_STR] = "";
4142         char newpath[SIZEOF_STR] = "";
4143         const char *info;
4144         size_t cmdsize = 0;
4145         enum open_flags split;
4146
4147         if (line->type == LINE_STAT_NONE ||
4148             (!status && line[1].type == LINE_STAT_NONE)) {
4149                 report("No file to diff");
4150                 return REQ_NONE;
4151         }
4152
4153         if (status) {
4154                 if (sq_quote(oldpath, 0, status->old.name) >= sizeof(oldpath))
4155                         return REQ_QUIT;
4156                 /* Diffs for unmerged entries are empty when pasing the
4157                  * new path, so leave it empty. */
4158                 if (status->status != 'U' &&
4159                     sq_quote(newpath, 0, status->new.name) >= sizeof(newpath))
4160                         return REQ_QUIT;
4161         }
4162
4163         if (opt_cdup[0] &&
4164             line->type != LINE_STAT_UNTRACKED &&
4165             !string_format_from(opt_cmd, &cmdsize, "cd %s;", opt_cdup))
4166                 return REQ_QUIT;
4167
4168         switch (line->type) {
4169         case LINE_STAT_STAGED:
4170                 if (is_initial_commit()) {
4171                         if (!string_format_from(opt_cmd, &cmdsize,
4172                                                 STATUS_DIFF_NO_HEAD_SHOW_CMD,
4173                                                 newpath))
4174                                 return REQ_QUIT;
4175                 } else {
4176                         if (!string_format_from(opt_cmd, &cmdsize,
4177                                                 STATUS_DIFF_INDEX_SHOW_CMD,
4178                                                 oldpath, newpath))
4179                                 return REQ_QUIT;
4180                 }
4181
4182                 if (status)
4183                         info = "Staged changes to %s";
4184                 else
4185                         info = "Staged changes";
4186                 break;
4187
4188         case LINE_STAT_UNSTAGED:
4189                 if (!string_format_from(opt_cmd, &cmdsize,
4190                                         STATUS_DIFF_FILES_SHOW_CMD, oldpath, newpath))
4191                         return REQ_QUIT;
4192                 if (status)
4193                         info = "Unstaged changes to %s";
4194                 else
4195                         info = "Unstaged changes";
4196                 break;
4197
4198         case LINE_STAT_UNTRACKED:
4199                 if (opt_pipe)
4200                         return REQ_QUIT;
4201
4202                 if (!status) {
4203                         report("No file to show");
4204                         return REQ_NONE;
4205                 }
4206
4207                 if (!suffixcmp(status->new.name, -1, "/")) {
4208                         report("Cannot display a directory");
4209                         return REQ_NONE;
4210                 }
4211
4212                 opt_pipe = fopen(status->new.name, "r");
4213                 info = "Untracked file %s";
4214                 break;
4215
4216         case LINE_STAT_HEAD:
4217                 return REQ_NONE;
4218
4219         default:
4220                 die("line type %d not handled in switch", line->type);
4221         }
4222
4223         split = view_is_displayed(view) ? OPEN_SPLIT : 0;
4224         open_view(view, REQ_VIEW_STAGE, OPEN_RELOAD | split);
4225         if (view_is_displayed(VIEW(REQ_VIEW_STAGE))) {
4226                 if (status) {
4227                         stage_status = *status;
4228                 } else {
4229                         memset(&stage_status, 0, sizeof(stage_status));
4230                 }
4231
4232                 stage_line_type = line->type;
4233                 stage_chunks = 0;
4234                 string_format(VIEW(REQ_VIEW_STAGE)->ref, info, stage_status.new.name);
4235         }
4236
4237         return REQ_NONE;
4238 }
4239
4240 static bool
4241 status_exists(struct status *status, enum line_type type)
4242 {
4243         struct view *view = VIEW(REQ_VIEW_STATUS);
4244         struct line *line;
4245
4246         for (line = view->line; line < view->line + view->lines; line++) {
4247                 struct status *pos = line->data;
4248
4249                 if (line->type == type && pos &&
4250                     !strcmp(status->new.name, pos->new.name))
4251                         return TRUE;
4252         }
4253
4254         return FALSE;
4255 }
4256
4257
4258 static FILE *
4259 status_update_prepare(enum line_type type)
4260 {
4261         char cmd[SIZEOF_STR];
4262         size_t cmdsize = 0;
4263
4264         if (opt_cdup[0] &&
4265             type != LINE_STAT_UNTRACKED &&
4266             !string_format_from(cmd, &cmdsize, "cd %s;", opt_cdup))
4267                 return NULL;
4268
4269         switch (type) {
4270         case LINE_STAT_STAGED:
4271                 string_add(cmd, cmdsize, "git update-index -z --index-info");
4272                 break;
4273
4274         case LINE_STAT_UNSTAGED:
4275         case LINE_STAT_UNTRACKED:
4276                 string_add(cmd, cmdsize, "git update-index -z --add --remove --stdin");
4277                 break;
4278
4279         default:
4280                 die("line type %d not handled in switch", type);
4281         }
4282
4283         return popen(cmd, "w");
4284 }
4285
4286 static bool
4287 status_update_write(FILE *pipe, struct status *status, enum line_type type)
4288 {
4289         char buf[SIZEOF_STR];
4290         size_t bufsize = 0;
4291         size_t written = 0;
4292
4293         switch (type) {
4294         case LINE_STAT_STAGED:
4295                 if (!string_format_from(buf, &bufsize, "%06o %s\t%s%c",
4296                                         status->old.mode,
4297                                         status->old.rev,
4298                                         status->old.name, 0))
4299                         return FALSE;
4300                 break;
4301
4302         case LINE_STAT_UNSTAGED:
4303         case LINE_STAT_UNTRACKED:
4304                 if (!string_format_from(buf, &bufsize, "%s%c", status->new.name, 0))
4305                         return FALSE;
4306                 break;
4307
4308         default:
4309                 die("line type %d not handled in switch", type);
4310         }
4311
4312         while (!ferror(pipe) && written < bufsize) {
4313                 written += fwrite(buf + written, 1, bufsize - written, pipe);
4314         }
4315
4316         return written == bufsize;
4317 }
4318
4319 static bool
4320 status_update_file(struct status *status, enum line_type type)
4321 {
4322         FILE *pipe = status_update_prepare(type);
4323         bool result;
4324
4325         if (!pipe)
4326                 return FALSE;
4327
4328         result = status_update_write(pipe, status, type);
4329         pclose(pipe);
4330         return result;
4331 }
4332
4333 static bool
4334 status_update_files(struct view *view, struct line *line)
4335 {
4336         FILE *pipe = status_update_prepare(line->type);
4337         bool result = TRUE;
4338         struct line *pos = view->line + view->lines;
4339         int files = 0;
4340         int file, done;
4341
4342         if (!pipe)
4343                 return FALSE;
4344
4345         for (pos = line; pos < view->line + view->lines && pos->data; pos++)
4346                 files++;
4347
4348         for (file = 0, done = 0; result && file < files; line++, file++) {
4349                 int almost_done = file * 100 / files;
4350
4351                 if (almost_done > done) {
4352                         done = almost_done;
4353                         string_format(view->ref, "updating file %u of %u (%d%% done)",
4354                                       file, files, done);
4355                         update_view_title(view);
4356                 }
4357                 result = status_update_write(pipe, line->data, line->type);
4358         }
4359
4360         pclose(pipe);
4361         return result;
4362 }
4363
4364 static bool
4365 status_update(struct view *view)
4366 {
4367         struct line *line = &view->line[view->lineno];
4368
4369         assert(view->lines);
4370
4371         if (!line->data) {
4372                 /* This should work even for the "On branch" line. */
4373                 if (line < view->line + view->lines && !line[1].data) {
4374                         report("Nothing to update");
4375                         return FALSE;
4376                 }
4377
4378                 if (!status_update_files(view, line + 1)) {
4379                         report("Failed to update file status");
4380                         return FALSE;
4381                 }
4382
4383         } else if (!status_update_file(line->data, line->type)) {
4384                 report("Failed to update file status");
4385                 return FALSE;
4386         }
4387
4388         return TRUE;
4389 }
4390
4391 static bool
4392 status_revert(struct status *status, enum line_type type, bool has_none)
4393 {
4394         if (!status || type != LINE_STAT_UNSTAGED) {
4395                 if (type == LINE_STAT_STAGED) {
4396                         report("Cannot revert changes to staged files");
4397                 } else if (type == LINE_STAT_UNTRACKED) {
4398                         report("Cannot revert changes to untracked files");
4399                 } else if (has_none) {
4400                         report("Nothing to revert");
4401                 } else {
4402                         report("Cannot revert changes to multiple files");
4403                 }
4404                 return FALSE;
4405
4406         } else {
4407                 char cmd[SIZEOF_STR];
4408                 char file_sq[SIZEOF_STR];
4409
4410                 if (sq_quote(file_sq, 0, status->old.name) >= sizeof(file_sq) ||
4411                     !string_format(cmd, "git checkout -- %s%s", opt_cdup, file_sq))
4412                         return FALSE;
4413
4414                 return run_confirm(cmd, "Are you sure you want to overwrite any changes?");
4415         }
4416 }
4417
4418 static enum request
4419 status_request(struct view *view, enum request request, struct line *line)
4420 {
4421         struct status *status = line->data;
4422
4423         switch (request) {
4424         case REQ_STATUS_UPDATE:
4425                 if (!status_update(view))
4426                         return REQ_NONE;
4427                 break;
4428
4429         case REQ_STATUS_REVERT:
4430                 if (!status_revert(status, line->type, status_has_none(view, line)))
4431                         return REQ_NONE;
4432                 break;
4433
4434         case REQ_STATUS_MERGE:
4435                 if (!status || status->status != 'U') {
4436                         report("Merging only possible for files with unmerged status ('U').");
4437                         return REQ_NONE;
4438                 }
4439                 open_mergetool(status->new.name);
4440                 break;
4441
4442         case REQ_EDIT:
4443                 if (!status)
4444                         return request;
4445                 if (status->status == 'D') {
4446                         report("File has been deleted.");
4447                         return REQ_NONE;
4448                 }
4449
4450                 open_editor(status->status != '?', status->new.name);
4451                 break;
4452
4453         case REQ_VIEW_BLAME:
4454                 if (status) {
4455                         string_copy(opt_file, status->new.name);
4456                         opt_ref[0] = 0;
4457                 }
4458                 return request;
4459
4460         case REQ_ENTER:
4461                 /* After returning the status view has been split to
4462                  * show the stage view. No further reloading is
4463                  * necessary. */
4464                 status_enter(view, line);
4465                 return REQ_NONE;
4466
4467         case REQ_REFRESH:
4468                 /* Simply reload the view. */
4469                 break;
4470
4471         default:
4472                 return request;
4473         }
4474
4475         open_view(view, REQ_VIEW_STATUS, OPEN_RELOAD);
4476
4477         return REQ_NONE;
4478 }
4479
4480 static void
4481 status_select(struct view *view, struct line *line)
4482 {
4483         struct status *status = line->data;
4484         char file[SIZEOF_STR] = "all files";
4485         const char *text;
4486         const char *key;
4487
4488         if (status && !string_format(file, "'%s'", status->new.name))
4489                 return;
4490
4491         if (!status && line[1].type == LINE_STAT_NONE)
4492                 line++;
4493
4494         switch (line->type) {
4495         case LINE_STAT_STAGED:
4496                 text = "Press %s to unstage %s for commit";
4497                 break;
4498
4499         case LINE_STAT_UNSTAGED:
4500                 text = "Press %s to stage %s for commit";
4501                 break;
4502
4503         case LINE_STAT_UNTRACKED:
4504                 text = "Press %s to stage %s for addition";
4505                 break;
4506
4507         case LINE_STAT_HEAD:
4508         case LINE_STAT_NONE:
4509                 text = "Nothing to update";
4510                 break;
4511
4512         default:
4513                 die("line type %d not handled in switch", line->type);
4514         }
4515
4516         if (status && status->status == 'U') {
4517                 text = "Press %s to resolve conflict in %s";
4518                 key = get_key(REQ_STATUS_MERGE);
4519
4520         } else {
4521                 key = get_key(REQ_STATUS_UPDATE);
4522         }
4523
4524         string_format(view->ref, text, key, file);
4525 }
4526
4527 static bool
4528 status_grep(struct view *view, struct line *line)
4529 {
4530         struct status *status = line->data;
4531         enum { S_STATUS, S_NAME, S_END } state;
4532         char buf[2] = "?";
4533         regmatch_t pmatch;
4534
4535         if (!status)
4536                 return FALSE;
4537
4538         for (state = S_STATUS; state < S_END; state++) {
4539                 const char *text;
4540
4541                 switch (state) {
4542                 case S_NAME:    text = status->new.name;        break;
4543                 case S_STATUS:
4544                         buf[0] = status->status;
4545                         text = buf;
4546                         break;
4547
4548                 default:
4549                         return FALSE;
4550                 }
4551
4552                 if (regexec(view->regex, text, 1, &pmatch, 0) != REG_NOMATCH)
4553                         return TRUE;
4554         }
4555
4556         return FALSE;
4557 }
4558
4559 static struct view_ops status_ops = {
4560         "file",
4561         status_open,
4562         NULL,
4563         status_draw,
4564         status_request,
4565         status_grep,
4566         status_select,
4567 };
4568
4569
4570 static bool
4571 stage_diff_line(FILE *pipe, struct line *line)
4572 {
4573         const char *buf = line->data;
4574         size_t bufsize = strlen(buf);
4575         size_t written = 0;
4576
4577         while (!ferror(pipe) && written < bufsize) {
4578                 written += fwrite(buf + written, 1, bufsize - written, pipe);
4579         }
4580
4581         fputc('\n', pipe);
4582
4583         return written == bufsize;
4584 }
4585
4586 static bool
4587 stage_diff_write(FILE *pipe, struct line *line, struct line *end)
4588 {
4589         while (line < end) {
4590                 if (!stage_diff_line(pipe, line++))
4591                         return FALSE;
4592                 if (line->type == LINE_DIFF_CHUNK ||
4593                     line->type == LINE_DIFF_HEADER)
4594                         break;
4595         }
4596
4597         return TRUE;
4598 }
4599
4600 static struct line *
4601 stage_diff_find(struct view *view, struct line *line, enum line_type type)
4602 {
4603         for (; view->line < line; line--)
4604                 if (line->type == type)
4605                         return line;
4606
4607         return NULL;
4608 }
4609
4610 static bool
4611 stage_apply_chunk(struct view *view, struct line *chunk, bool revert)
4612 {
4613         char cmd[SIZEOF_STR];
4614         size_t cmdsize = 0;
4615         struct line *diff_hdr;
4616         FILE *pipe;
4617
4618         diff_hdr = stage_diff_find(view, chunk, LINE_DIFF_HEADER);
4619         if (!diff_hdr)
4620                 return FALSE;
4621
4622         if (opt_cdup[0] &&
4623             !string_format_from(cmd, &cmdsize, "cd %s;", opt_cdup))
4624                 return FALSE;
4625
4626         if (!string_format_from(cmd, &cmdsize,
4627                                 "git apply --whitespace=nowarn %s %s - && "
4628                                 "git update-index -q --unmerged --refresh 2>/dev/null",
4629                                 revert ? "" : "--cached",
4630                                 revert || stage_line_type == LINE_STAT_STAGED ? "-R" : ""))
4631                 return FALSE;
4632
4633         pipe = popen(cmd, "w");
4634         if (!pipe)
4635                 return FALSE;
4636
4637         if (!stage_diff_write(pipe, diff_hdr, chunk) ||
4638             !stage_diff_write(pipe, chunk, view->line + view->lines))
4639                 chunk = NULL;
4640
4641         pclose(pipe);
4642
4643         return chunk ? TRUE : FALSE;
4644 }
4645
4646 static bool
4647 stage_update(struct view *view, struct line *line)
4648 {
4649         struct line *chunk = NULL;
4650
4651         if (!is_initial_commit() && stage_line_type != LINE_STAT_UNTRACKED)
4652                 chunk = stage_diff_find(view, line, LINE_DIFF_CHUNK);
4653
4654         if (chunk) {
4655                 if (!stage_apply_chunk(view, chunk, FALSE)) {
4656                         report("Failed to apply chunk");
4657                         return FALSE;
4658                 }
4659
4660         } else if (!stage_status.status) {
4661                 view = VIEW(REQ_VIEW_STATUS);
4662
4663                 for (line = view->line; line < view->line + view->lines; line++)
4664                         if (line->type == stage_line_type)
4665                                 break;
4666
4667                 if (!status_update_files(view, line + 1)) {
4668                         report("Failed to update files");
4669                         return FALSE;
4670                 }
4671
4672         } else if (!status_update_file(&stage_status, stage_line_type)) {
4673                 report("Failed to update file");
4674                 return FALSE;
4675         }
4676
4677         return TRUE;
4678 }
4679
4680 static bool
4681 stage_revert(struct view *view, struct line *line)
4682 {
4683         struct line *chunk = NULL;
4684
4685         if (!is_initial_commit() && stage_line_type == LINE_STAT_UNSTAGED)
4686                 chunk = stage_diff_find(view, line, LINE_DIFF_CHUNK);
4687
4688         if (chunk) {
4689                 if (!prompt_yesno("Are you sure you want to revert changes?"))
4690                         return FALSE;
4691
4692                 if (!stage_apply_chunk(view, chunk, TRUE)) {
4693                         report("Failed to revert chunk");
4694                         return FALSE;
4695                 }
4696                 return TRUE;
4697
4698         } else {
4699                 return status_revert(stage_status.status ? &stage_status : NULL,
4700                                      stage_line_type, FALSE);
4701         }
4702 }
4703
4704
4705 static void
4706 stage_next(struct view *view, struct line *line)
4707 {
4708         int i;
4709
4710         if (!stage_chunks) {
4711                 static size_t alloc = 0;
4712                 int *tmp;
4713
4714                 for (line = view->line; line < view->line + view->lines; line++) {
4715                         if (line->type != LINE_DIFF_CHUNK)
4716                                 continue;
4717
4718                         tmp = realloc_items(stage_chunk, &alloc,
4719                                             stage_chunks, sizeof(*tmp));
4720                         if (!tmp) {
4721                                 report("Allocation failure");
4722                                 return;
4723                         }
4724
4725                         stage_chunk = tmp;
4726                         stage_chunk[stage_chunks++] = line - view->line;
4727                 }
4728         }
4729
4730         for (i = 0; i < stage_chunks; i++) {
4731                 if (stage_chunk[i] > view->lineno) {
4732                         do_scroll_view(view, stage_chunk[i] - view->lineno);
4733                         report("Chunk %d of %d", i + 1, stage_chunks);
4734                         return;
4735                 }
4736         }
4737
4738         report("No next chunk found");
4739 }
4740
4741 static enum request
4742 stage_request(struct view *view, enum request request, struct line *line)
4743 {
4744         switch (request) {
4745         case REQ_STATUS_UPDATE:
4746                 if (!stage_update(view, line))
4747                         return REQ_NONE;
4748                 break;
4749
4750         case REQ_STATUS_REVERT:
4751                 if (!stage_revert(view, line))
4752                         return REQ_NONE;
4753                 break;
4754
4755         case REQ_STAGE_NEXT:
4756                 if (stage_line_type == LINE_STAT_UNTRACKED) {
4757                         report("File is untracked; press %s to add",
4758                                get_key(REQ_STATUS_UPDATE));
4759                         return REQ_NONE;
4760                 }
4761                 stage_next(view, line);
4762                 return REQ_NONE;
4763
4764         case REQ_EDIT:
4765                 if (!stage_status.new.name[0])
4766                         return request;
4767                 if (stage_status.status == 'D') {
4768                         report("File has been deleted.");
4769                         return REQ_NONE;
4770                 }
4771
4772                 open_editor(stage_status.status != '?', stage_status.new.name);
4773                 break;
4774
4775         case REQ_REFRESH:
4776                 /* Reload everything ... */
4777