Merge branch 'pb/bisect'
[git] / ls-files.c
1 /*
2  * This merges the file listing in the directory cache index
3  * with the actual working directory list, and shows different
4  * combinations of the two.
5  *
6  * Copyright (C) Linus Torvalds, 2005
7  */
8 #include <dirent.h>
9 #include <fnmatch.h>
10
11 #include "cache.h"
12 #include "quote.h"
13
14 static int show_deleted = 0;
15 static int show_cached = 0;
16 static int show_others = 0;
17 static int show_ignored = 0;
18 static int show_stage = 0;
19 static int show_unmerged = 0;
20 static int show_modified = 0;
21 static int show_killed = 0;
22 static int show_other_directories = 0;
23 static int show_valid_bit = 0;
24 static int line_terminator = '\n';
25
26 static int prefix_len = 0, prefix_offset = 0;
27 static const char *prefix = NULL;
28 static const char **pathspec = NULL;
29
30 static const char *tag_cached = "";
31 static const char *tag_unmerged = "";
32 static const char *tag_removed = "";
33 static const char *tag_other = "";
34 static const char *tag_killed = "";
35 static const char *tag_modified = "";
36
37 static const char *exclude_per_dir = NULL;
38
39 /* We maintain three exclude pattern lists:
40  * EXC_CMDL lists patterns explicitly given on the command line.
41  * EXC_DIRS lists patterns obtained from per-directory ignore files.
42  * EXC_FILE lists patterns from fallback ignore files.
43  */
44 #define EXC_CMDL 0
45 #define EXC_DIRS 1
46 #define EXC_FILE 2
47 static struct exclude_list {
48         int nr;
49         int alloc;
50         struct exclude {
51                 const char *pattern;
52                 const char *base;
53                 int baselen;
54         } **excludes;
55 } exclude_list[3];
56
57 static void add_exclude(const char *string, const char *base,
58                         int baselen, struct exclude_list *which)
59 {
60         struct exclude *x = xmalloc(sizeof (*x));
61
62         x->pattern = string;
63         x->base = base;
64         x->baselen = baselen;
65         if (which->nr == which->alloc) {
66                 which->alloc = alloc_nr(which->alloc);
67                 which->excludes = realloc(which->excludes,
68                                           which->alloc * sizeof(x));
69         }
70         which->excludes[which->nr++] = x;
71 }
72
73 static int add_excludes_from_file_1(const char *fname,
74                                     const char *base,
75                                     int baselen,
76                                     struct exclude_list *which)
77 {
78         int fd, i;
79         long size;
80         char *buf, *entry;
81
82         fd = open(fname, O_RDONLY);
83         if (fd < 0)
84                 goto err;
85         size = lseek(fd, 0, SEEK_END);
86         if (size < 0)
87                 goto err;
88         lseek(fd, 0, SEEK_SET);
89         if (size == 0) {
90                 close(fd);
91                 return 0;
92         }
93         buf = xmalloc(size);
94         if (read(fd, buf, size) != size)
95                 goto err;
96         close(fd);
97
98         entry = buf;
99         for (i = 0; i < size; i++) {
100                 if (buf[i] == '\n') {
101                         if (entry != buf + i && entry[0] != '#') {
102                                 buf[i - (i && buf[i-1] == '\r')] = 0;
103                                 add_exclude(entry, base, baselen, which);
104                         }
105                         entry = buf + i + 1;
106                 }
107         }
108         return 0;
109
110  err:
111         if (0 <= fd)
112                 close(fd);
113         return -1;
114 }
115
116 static void add_excludes_from_file(const char *fname)
117 {
118         if (add_excludes_from_file_1(fname, "", 0,
119                                      &exclude_list[EXC_FILE]) < 0)
120                 die("cannot use %s as an exclude file", fname);
121 }
122
123 static int push_exclude_per_directory(const char *base, int baselen)
124 {
125         char exclude_file[PATH_MAX];
126         struct exclude_list *el = &exclude_list[EXC_DIRS];
127         int current_nr = el->nr;
128
129         if (exclude_per_dir) {
130                 memcpy(exclude_file, base, baselen);
131                 strcpy(exclude_file + baselen, exclude_per_dir);
132                 add_excludes_from_file_1(exclude_file, base, baselen, el);
133         }
134         return current_nr;
135 }
136
137 static void pop_exclude_per_directory(int stk)
138 {
139         struct exclude_list *el = &exclude_list[EXC_DIRS];
140
141         while (stk < el->nr)
142                 free(el->excludes[--el->nr]);
143 }
144
145 /* Scan the list and let the last match determines the fate.
146  * Return 1 for exclude, 0 for include and -1 for undecided.
147  */
148 static int excluded_1(const char *pathname,
149                       int pathlen,
150                       struct exclude_list *el)
151 {
152         int i;
153
154         if (el->nr) {
155                 for (i = el->nr - 1; 0 <= i; i--) {
156                         struct exclude *x = el->excludes[i];
157                         const char *exclude = x->pattern;
158                         int to_exclude = 1;
159
160                         if (*exclude == '!') {
161                                 to_exclude = 0;
162                                 exclude++;
163                         }
164
165                         if (!strchr(exclude, '/')) {
166                                 /* match basename */
167                                 const char *basename = strrchr(pathname, '/');
168                                 basename = (basename) ? basename+1 : pathname;
169                                 if (fnmatch(exclude, basename, 0) == 0)
170                                         return to_exclude;
171                         }
172                         else {
173                                 /* match with FNM_PATHNAME:
174                                  * exclude has base (baselen long) implicitly
175                                  * in front of it.
176                                  */
177                                 int baselen = x->baselen;
178                                 if (*exclude == '/')
179                                         exclude++;
180
181                                 if (pathlen < baselen ||
182                                     (baselen && pathname[baselen-1] != '/') ||
183                                     strncmp(pathname, x->base, baselen))
184                                     continue;
185
186                                 if (fnmatch(exclude, pathname+baselen,
187                                             FNM_PATHNAME) == 0)
188                                         return to_exclude;
189                         }
190                 }
191         }
192         return -1; /* undecided */
193 }
194
195 static int excluded(const char *pathname)
196 {
197         int pathlen = strlen(pathname);
198         int st;
199
200         for (st = EXC_CMDL; st <= EXC_FILE; st++) {
201                 switch (excluded_1(pathname, pathlen, &exclude_list[st])) {
202                 case 0:
203                         return 0;
204                 case 1:
205                         return 1;
206                 }
207         }
208         return 0;
209 }
210
211 struct nond_on_fs {
212         int len;
213         char name[FLEX_ARRAY]; /* more */
214 };
215
216 static struct nond_on_fs **dir;
217 static int nr_dir;
218 static int dir_alloc;
219
220 static void add_name(const char *pathname, int len)
221 {
222         struct nond_on_fs *ent;
223
224         if (cache_name_pos(pathname, len) >= 0)
225                 return;
226
227         if (nr_dir == dir_alloc) {
228                 dir_alloc = alloc_nr(dir_alloc);
229                 dir = xrealloc(dir, dir_alloc*sizeof(ent));
230         }
231         ent = xmalloc(sizeof(*ent) + len + 1);
232         ent->len = len;
233         memcpy(ent->name, pathname, len);
234         ent->name[len] = 0;
235         dir[nr_dir++] = ent;
236 }
237
238 static int dir_exists(const char *dirname, int len)
239 {
240         int pos = cache_name_pos(dirname, len);
241         if (pos >= 0)
242                 return 1;
243         pos = -pos-1;
244         if (pos >= active_nr) /* can't */
245                 return 0;
246         return !strncmp(active_cache[pos]->name, dirname, len);
247 }
248
249 /*
250  * Read a directory tree. We currently ignore anything but
251  * directories, regular files and symlinks. That's because git
252  * doesn't handle them at all yet. Maybe that will change some
253  * day.
254  *
255  * Also, we ignore the name ".git" (even if it is not a directory).
256  * That likely will not change.
257  */
258 static void read_directory(const char *path, const char *base, int baselen)
259 {
260         DIR *dir = opendir(path);
261
262         if (dir) {
263                 int exclude_stk;
264                 struct dirent *de;
265                 char fullname[MAXPATHLEN + 1];
266                 memcpy(fullname, base, baselen);
267
268                 exclude_stk = push_exclude_per_directory(base, baselen);
269
270                 while ((de = readdir(dir)) != NULL) {
271                         int len;
272
273                         if ((de->d_name[0] == '.') &&
274                             (de->d_name[1] == 0 ||
275                              !strcmp(de->d_name + 1, ".") ||
276                              !strcmp(de->d_name + 1, "git")))
277                                 continue;
278                         len = strlen(de->d_name);
279                         memcpy(fullname + baselen, de->d_name, len+1);
280                         if (excluded(fullname) != show_ignored)
281                                 continue;
282
283                         switch (DTYPE(de)) {
284                         struct stat st;
285                         default:
286                                 continue;
287                         case DT_UNKNOWN:
288                                 if (lstat(fullname, &st))
289                                         continue;
290                                 if (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode))
291                                         break;
292                                 if (!S_ISDIR(st.st_mode))
293                                         continue;
294                                 /* fallthrough */
295                         case DT_DIR:
296                                 memcpy(fullname + baselen + len, "/", 2);
297                                 len++;
298                                 if (show_other_directories &&
299                                     !dir_exists(fullname, baselen + len))
300                                         break;
301                                 read_directory(fullname, fullname,
302                                                baselen + len);
303                                 continue;
304                         case DT_REG:
305                         case DT_LNK:
306                                 break;
307                         }
308                         add_name(fullname, baselen + len);
309                 }
310                 closedir(dir);
311
312                 pop_exclude_per_directory(exclude_stk);
313         }
314 }
315
316 static int cmp_name(const void *p1, const void *p2)
317 {
318         const struct nond_on_fs *e1 = *(const struct nond_on_fs **)p1;
319         const struct nond_on_fs *e2 = *(const struct nond_on_fs **)p2;
320
321         return cache_name_compare(e1->name, e1->len,
322                                   e2->name, e2->len);
323 }
324
325 /*
326  * Match a pathspec against a filename. The first "len" characters
327  * are the common prefix
328  */
329 static int match(const char **spec, const char *filename, int len)
330 {
331         const char *m;
332
333         while ((m = *spec++) != NULL) {
334                 int matchlen = strlen(m + len);
335
336                 if (!matchlen)
337                         return 1;
338                 if (!strncmp(m + len, filename + len, matchlen)) {
339                         if (m[len + matchlen - 1] == '/')
340                                 return 1;
341                         switch (filename[len + matchlen]) {
342                         case '/': case '\0':
343                                 return 1;
344                         }
345                 }
346                 if (!fnmatch(m + len, filename + len, 0))
347                         return 1;
348         }
349         return 0;
350 }
351
352 static void show_dir_entry(const char *tag, struct nond_on_fs *ent)
353 {
354         int len = prefix_len;
355         int offset = prefix_offset;
356
357         if (len >= ent->len)
358                 die("git-ls-files: internal error - directory entry not superset of prefix");
359
360         if (pathspec && !match(pathspec, ent->name, len))
361                 return;
362
363         fputs(tag, stdout);
364         write_name_quoted("", 0, ent->name + offset, line_terminator, stdout);
365         putchar(line_terminator);
366 }
367
368 static void show_other_files(void)
369 {
370         int i;
371         for (i = 0; i < nr_dir; i++) {
372                 /* We should not have a matching entry, but we
373                  * may have an unmerged entry for this path.
374                  */
375                 struct nond_on_fs *ent = dir[i];
376                 int pos = cache_name_pos(ent->name, ent->len);
377                 struct cache_entry *ce;
378                 if (0 <= pos)
379                         die("bug in show-other-files");
380                 pos = -pos - 1;
381                 if (pos < active_nr) { 
382                         ce = active_cache[pos];
383                         if (ce_namelen(ce) == ent->len &&
384                             !memcmp(ce->name, ent->name, ent->len))
385                                 continue; /* Yup, this one exists unmerged */
386                 }
387                 show_dir_entry(tag_other, ent);
388         }
389 }
390
391 static void show_killed_files(void)
392 {
393         int i;
394         for (i = 0; i < nr_dir; i++) {
395                 struct nond_on_fs *ent = dir[i];
396                 char *cp, *sp;
397                 int pos, len, killed = 0;
398
399                 for (cp = ent->name; cp - ent->name < ent->len; cp = sp + 1) {
400                         sp = strchr(cp, '/');
401                         if (!sp) {
402                                 /* If ent->name is prefix of an entry in the
403                                  * cache, it will be killed.
404                                  */
405                                 pos = cache_name_pos(ent->name, ent->len);
406                                 if (0 <= pos)
407                                         die("bug in show-killed-files");
408                                 pos = -pos - 1;
409                                 while (pos < active_nr &&
410                                        ce_stage(active_cache[pos]))
411                                         pos++; /* skip unmerged */
412                                 if (active_nr <= pos)
413                                         break;
414                                 /* pos points at a name immediately after
415                                  * ent->name in the cache.  Does it expect
416                                  * ent->name to be a directory?
417                                  */
418                                 len = ce_namelen(active_cache[pos]);
419                                 if ((ent->len < len) &&
420                                     !strncmp(active_cache[pos]->name,
421                                              ent->name, ent->len) &&
422                                     active_cache[pos]->name[ent->len] == '/')
423                                         killed = 1;
424                                 break;
425                         }
426                         if (0 <= cache_name_pos(ent->name, sp - ent->name)) {
427                                 /* If any of the leading directories in
428                                  * ent->name is registered in the cache,
429                                  * ent->name will be killed.
430                                  */
431                                 killed = 1;
432                                 break;
433                         }
434                 }
435                 if (killed)
436                         show_dir_entry(tag_killed, dir[i]);
437         }
438 }
439
440 static void show_ce_entry(const char *tag, struct cache_entry *ce)
441 {
442         int len = prefix_len;
443         int offset = prefix_offset;
444
445         if (len >= ce_namelen(ce))
446                 die("git-ls-files: internal error - cache entry not superset of prefix");
447
448         if (pathspec && !match(pathspec, ce->name, len))
449                 return;
450
451         if (tag && *tag && show_valid_bit &&
452             (ce->ce_flags & htons(CE_VALID))) {
453                 static char alttag[4];
454                 memcpy(alttag, tag, 3);
455                 if (isalpha(tag[0]))
456                         alttag[0] = tolower(tag[0]);
457                 else if (tag[0] == '?')
458                         alttag[0] = '!';
459                 else {
460                         alttag[0] = 'v';
461                         alttag[1] = tag[0];
462                         alttag[2] = ' ';
463                         alttag[3] = 0;
464                 }
465                 tag = alttag;
466         }
467
468         if (!show_stage) {
469                 fputs(tag, stdout);
470                 write_name_quoted("", 0, ce->name + offset,
471                                   line_terminator, stdout);
472                 putchar(line_terminator);
473         }
474         else {
475                 printf("%s%06o %s %d\t",
476                        tag,
477                        ntohl(ce->ce_mode),
478                        sha1_to_hex(ce->sha1),
479                        ce_stage(ce));
480                 write_name_quoted("", 0, ce->name + offset,
481                                   line_terminator, stdout);
482                 putchar(line_terminator);
483         }
484 }
485
486 static void show_files(void)
487 {
488         int i;
489
490         /* For cached/deleted files we don't need to even do the readdir */
491         if (show_others || show_killed) {
492                 const char *path = ".", *base = "";
493                 int baselen = prefix_len;
494
495                 if (baselen) {
496                         path = base = prefix;
497                         if (exclude_per_dir) {
498                                 char *p, *pp = xmalloc(baselen+1);
499                                 memcpy(pp, prefix, baselen+1);
500                                 p = pp;
501                                 while (1) {
502                                         char save = *p;
503                                         *p = 0;
504                                         push_exclude_per_directory(pp, p-pp);
505                                         *p++ = save;
506                                         if (!save)
507                                                 break;
508                                         p = strchr(p, '/');
509                                         if (p)
510                                                 p++;
511                                         else
512                                                 p = pp + baselen;
513                                 }
514                                 free(pp);
515                         }
516                 }
517                 read_directory(path, base, baselen);
518                 qsort(dir, nr_dir, sizeof(struct nond_on_fs *), cmp_name);
519                 if (show_others)
520                         show_other_files();
521                 if (show_killed)
522                         show_killed_files();
523         }
524         if (show_cached | show_stage) {
525                 for (i = 0; i < active_nr; i++) {
526                         struct cache_entry *ce = active_cache[i];
527                         if (excluded(ce->name) != show_ignored)
528                                 continue;
529                         if (show_unmerged && !ce_stage(ce))
530                                 continue;
531                         show_ce_entry(ce_stage(ce) ? tag_unmerged : tag_cached, ce);
532                 }
533         }
534         if (show_deleted | show_modified) {
535                 for (i = 0; i < active_nr; i++) {
536                         struct cache_entry *ce = active_cache[i];
537                         struct stat st;
538                         int err;
539                         if (excluded(ce->name) != show_ignored)
540                                 continue;
541                         err = lstat(ce->name, &st);
542                         if (show_deleted && err)
543                                 show_ce_entry(tag_removed, ce);
544                         if (show_modified && ce_modified(ce, &st, 0))
545                                 show_ce_entry(tag_modified, ce);
546                 }
547         }
548 }
549
550 /*
551  * Prune the index to only contain stuff starting with "prefix"
552  */
553 static void prune_cache(void)
554 {
555         int pos = cache_name_pos(prefix, prefix_len);
556         unsigned int first, last;
557
558         if (pos < 0)
559                 pos = -pos-1;
560         active_cache += pos;
561         active_nr -= pos;
562         first = 0;
563         last = active_nr;
564         while (last > first) {
565                 int next = (last + first) >> 1;
566                 struct cache_entry *ce = active_cache[next];
567                 if (!strncmp(ce->name, prefix, prefix_len)) {
568                         first = next+1;
569                         continue;
570                 }
571                 last = next;
572         }
573         active_nr = last;
574 }
575
576 static void verify_pathspec(void)
577 {
578         const char **p, *n, *prev;
579         char *real_prefix;
580         unsigned long max;
581
582         prev = NULL;
583         max = PATH_MAX;
584         for (p = pathspec; (n = *p) != NULL; p++) {
585                 int i, len = 0;
586                 for (i = 0; i < max; i++) {
587                         char c = n[i];
588                         if (prev && prev[i] != c)
589                                 break;
590                         if (!c || c == '*' || c == '?')
591                                 break;
592                         if (c == '/')
593                                 len = i+1;
594                 }
595                 prev = n;
596                 if (len < max) {
597                         max = len;
598                         if (!max)
599                                 break;
600                 }
601         }
602
603         if (prefix_offset > max || memcmp(prev, prefix, prefix_offset))
604                 die("git-ls-files: cannot generate relative filenames containing '..'");
605
606         real_prefix = NULL;
607         prefix_len = max;
608         if (max) {
609                 real_prefix = xmalloc(max + 1);
610                 memcpy(real_prefix, prev, max);
611                 real_prefix[max] = 0;
612         }
613         prefix = real_prefix;
614 }
615
616 static const char ls_files_usage[] =
617         "git-ls-files [-z] [-t] [-v] (--[cached|deleted|others|stage|unmerged|killed|modified])* "
618         "[ --ignored ] [--exclude=<pattern>] [--exclude-from=<file>] "
619         "[ --exclude-per-directory=<filename> ] [--full-name] [--] [<file>]*";
620
621 int main(int argc, const char **argv)
622 {
623         int i;
624         int exc_given = 0;
625
626         prefix = setup_git_directory();
627         if (prefix)
628                 prefix_offset = strlen(prefix);
629         git_config(git_default_config);
630
631         for (i = 1; i < argc; i++) {
632                 const char *arg = argv[i];
633
634                 if (!strcmp(arg, "--")) {
635                         i++;
636                         break;
637                 }
638                 if (!strcmp(arg, "-z")) {
639                         line_terminator = 0;
640                         continue;
641                 }
642                 if (!strcmp(arg, "-t") || !strcmp(arg, "-v")) {
643                         tag_cached = "H ";
644                         tag_unmerged = "M ";
645                         tag_removed = "R ";
646                         tag_modified = "C ";
647                         tag_other = "? ";
648                         tag_killed = "K ";
649                         if (arg[1] == 'v')
650                                 show_valid_bit = 1;
651                         continue;
652                 }
653                 if (!strcmp(arg, "-c") || !strcmp(arg, "--cached")) {
654                         show_cached = 1;
655                         continue;
656                 }
657                 if (!strcmp(arg, "-d") || !strcmp(arg, "--deleted")) {
658                         show_deleted = 1;
659                         continue;
660                 }
661                 if (!strcmp(arg, "-m") || !strcmp(arg, "--modified")) {
662                         show_modified = 1;
663                         continue;
664                 }
665                 if (!strcmp(arg, "-o") || !strcmp(arg, "--others")) {
666                         show_others = 1;
667                         continue;
668                 }
669                 if (!strcmp(arg, "-i") || !strcmp(arg, "--ignored")) {
670                         show_ignored = 1;
671                         continue;
672                 }
673                 if (!strcmp(arg, "-s") || !strcmp(arg, "--stage")) {
674                         show_stage = 1;
675                         continue;
676                 }
677                 if (!strcmp(arg, "-k") || !strcmp(arg, "--killed")) {
678                         show_killed = 1;
679                         continue;
680                 }
681                 if (!strcmp(arg, "--directory")) {
682                         show_other_directories = 1;
683                         continue;
684                 }
685                 if (!strcmp(arg, "-u") || !strcmp(arg, "--unmerged")) {
686                         /* There's no point in showing unmerged unless
687                          * you also show the stage information.
688                          */
689                         show_stage = 1;
690                         show_unmerged = 1;
691                         continue;
692                 }
693                 if (!strcmp(arg, "-x") && i+1 < argc) {
694                         exc_given = 1;
695                         add_exclude(argv[++i], "", 0, &exclude_list[EXC_CMDL]);
696                         continue;
697                 }
698                 if (!strncmp(arg, "--exclude=", 10)) {
699                         exc_given = 1;
700                         add_exclude(arg+10, "", 0, &exclude_list[EXC_CMDL]);
701                         continue;
702                 }
703                 if (!strcmp(arg, "-X") && i+1 < argc) {
704                         exc_given = 1;
705                         add_excludes_from_file(argv[++i]);
706                         continue;
707                 }
708                 if (!strncmp(arg, "--exclude-from=", 15)) {
709                         exc_given = 1;
710                         add_excludes_from_file(arg+15);
711                         continue;
712                 }
713                 if (!strncmp(arg, "--exclude-per-directory=", 24)) {
714                         exc_given = 1;
715                         exclude_per_dir = arg + 24;
716                         continue;
717                 }
718                 if (!strcmp(arg, "--full-name")) {
719                         prefix_offset = 0;
720                         continue;
721                 }
722                 if (*arg == '-')
723                         usage(ls_files_usage);
724                 break;
725         }
726
727         pathspec = get_pathspec(prefix, argv + i);
728
729         /* Verify that the pathspec matches the prefix */
730         if (pathspec)
731                 verify_pathspec();
732
733         if (show_ignored && !exc_given) {
734                 fprintf(stderr, "%s: --ignored needs some exclude pattern\n",
735                         argv[0]);
736                 exit(1);
737         }
738
739         /* With no flags, we default to showing the cached files */
740         if (!(show_stage | show_deleted | show_others | show_unmerged |
741               show_killed | show_modified))
742                 show_cached = 1;
743
744         read_cache();
745         if (prefix)
746                 prune_cache();
747         show_files();
748         return 0;
749 }