Merge branch 'jc/maint-1.6.0-keep-pack'
[git] / builtin-branch.c
1 /*
2  * Builtin "git branch"
3  *
4  * Copyright (c) 2006 Kristian Høgsberg <krh@redhat.com>
5  * Based on git-branch.sh by Junio C Hamano.
6  */
7
8 #include "cache.h"
9 #include "color.h"
10 #include "refs.h"
11 #include "commit.h"
12 #include "builtin.h"
13 #include "remote.h"
14 #include "parse-options.h"
15 #include "branch.h"
16 #include "diff.h"
17 #include "revision.h"
18
19 static const char * const builtin_branch_usage[] = {
20         "git branch [options] [-r | -a] [--merged | --no-merged]",
21         "git branch [options] [-l] [-f] <branchname> [<start-point>]",
22         "git branch [options] [-r] (-d | -D) <branchname>",
23         "git branch [options] (-m | -M) [<oldbranch>] <newbranch>",
24         NULL
25 };
26
27 #define REF_LOCAL_BRANCH    0x01
28 #define REF_REMOTE_BRANCH   0x02
29
30 static const char *head;
31 static unsigned char head_sha1[20];
32
33 static int branch_use_color = -1;
34 static char branch_colors[][COLOR_MAXLEN] = {
35         GIT_COLOR_RESET,
36         GIT_COLOR_NORMAL,       /* PLAIN */
37         GIT_COLOR_RED,          /* REMOTE */
38         GIT_COLOR_NORMAL,       /* LOCAL */
39         GIT_COLOR_GREEN,        /* CURRENT */
40 };
41 enum color_branch {
42         BRANCH_COLOR_RESET = 0,
43         BRANCH_COLOR_PLAIN = 1,
44         BRANCH_COLOR_REMOTE = 2,
45         BRANCH_COLOR_LOCAL = 3,
46         BRANCH_COLOR_CURRENT = 4,
47 };
48
49 static enum merge_filter {
50         NO_FILTER = 0,
51         SHOW_NOT_MERGED,
52         SHOW_MERGED,
53 } merge_filter;
54 static unsigned char merge_filter_ref[20];
55
56 static int parse_branch_color_slot(const char *var, int ofs)
57 {
58         if (!strcasecmp(var+ofs, "plain"))
59                 return BRANCH_COLOR_PLAIN;
60         if (!strcasecmp(var+ofs, "reset"))
61                 return BRANCH_COLOR_RESET;
62         if (!strcasecmp(var+ofs, "remote"))
63                 return BRANCH_COLOR_REMOTE;
64         if (!strcasecmp(var+ofs, "local"))
65                 return BRANCH_COLOR_LOCAL;
66         if (!strcasecmp(var+ofs, "current"))
67                 return BRANCH_COLOR_CURRENT;
68         die("bad config variable '%s'", var);
69 }
70
71 static int git_branch_config(const char *var, const char *value, void *cb)
72 {
73         if (!strcmp(var, "color.branch")) {
74                 branch_use_color = git_config_colorbool(var, value, -1);
75                 return 0;
76         }
77         if (!prefixcmp(var, "color.branch.")) {
78                 int slot = parse_branch_color_slot(var, 13);
79                 if (!value)
80                         return config_error_nonbool(var);
81                 color_parse(value, var, branch_colors[slot]);
82                 return 0;
83         }
84         return git_color_default_config(var, value, cb);
85 }
86
87 static const char *branch_get_color(enum color_branch ix)
88 {
89         if (branch_use_color > 0)
90                 return branch_colors[ix];
91         return "";
92 }
93
94 static int delete_branches(int argc, const char **argv, int force, int kinds)
95 {
96         struct commit *rev, *head_rev = head_rev;
97         unsigned char sha1[20];
98         char *name = NULL;
99         const char *fmt, *remote;
100         int i;
101         int ret = 0;
102         struct strbuf bname = STRBUF_INIT;
103
104         switch (kinds) {
105         case REF_REMOTE_BRANCH:
106                 fmt = "refs/remotes/%s";
107                 remote = "remote ";
108                 force = 1;
109                 break;
110         case REF_LOCAL_BRANCH:
111                 fmt = "refs/heads/%s";
112                 remote = "";
113                 break;
114         default:
115                 die("cannot use -a with -d");
116         }
117
118         if (!force) {
119                 head_rev = lookup_commit_reference(head_sha1);
120                 if (!head_rev)
121                         die("Couldn't look up commit object for HEAD");
122         }
123         for (i = 0; i < argc; i++, strbuf_release(&bname)) {
124                 int len = strlen(argv[i]);
125
126                 if (interpret_nth_last_branch(argv[i], &bname) != len)
127                         strbuf_add(&bname, argv[i], len);
128
129                 if (kinds == REF_LOCAL_BRANCH && !strcmp(head, bname.buf)) {
130                         error("Cannot delete the branch '%s' "
131                               "which you are currently on.", bname.buf);
132                         ret = 1;
133                         continue;
134                 }
135
136                 free(name);
137
138                 name = xstrdup(mkpath(fmt, bname.buf));
139                 if (!resolve_ref(name, sha1, 1, NULL)) {
140                         error("%sbranch '%s' not found.",
141                                         remote, bname.buf);
142                         ret = 1;
143                         continue;
144                 }
145
146                 rev = lookup_commit_reference(sha1);
147                 if (!rev) {
148                         error("Couldn't look up commit object for '%s'", name);
149                         ret = 1;
150                         continue;
151                 }
152
153                 /* This checks whether the merge bases of branch and
154                  * HEAD contains branch -- which means that the HEAD
155                  * contains everything in both.
156                  */
157
158                 if (!force &&
159                     !in_merge_bases(rev, &head_rev, 1)) {
160                         error("The branch '%s' is not an ancestor of "
161                               "your current HEAD.\n"
162                               "If you are sure you want to delete it, "
163                               "run 'git branch -D %s'.", bname.buf, bname.buf);
164                         ret = 1;
165                         continue;
166                 }
167
168                 if (delete_ref(name, sha1, 0)) {
169                         error("Error deleting %sbranch '%s'", remote,
170                               bname.buf);
171                         ret = 1;
172                 } else {
173                         struct strbuf buf = STRBUF_INIT;
174                         printf("Deleted %sbranch %s (was %s).\n", remote,
175                                bname.buf,
176                                find_unique_abbrev(sha1, DEFAULT_ABBREV));
177                         strbuf_addf(&buf, "branch.%s", bname.buf);
178                         if (git_config_rename_section(buf.buf, NULL) < 0)
179                                 warning("Update of config-file failed");
180                         strbuf_release(&buf);
181                 }
182         }
183
184         free(name);
185
186         return(ret);
187 }
188
189 struct ref_item {
190         char *name;
191         char *dest;
192         unsigned int kind, len;
193         struct commit *commit;
194 };
195
196 struct ref_list {
197         struct rev_info revs;
198         int index, alloc, maxwidth;
199         struct ref_item *list;
200         struct commit_list *with_commit;
201         int kinds;
202 };
203
204 static char *resolve_symref(const char *src, const char *prefix)
205 {
206         unsigned char sha1[20];
207         int flag;
208         const char *dst, *cp;
209
210         dst = resolve_ref(src, sha1, 0, &flag);
211         if (!(dst && (flag & REF_ISSYMREF)))
212                 return NULL;
213         if (prefix && (cp = skip_prefix(dst, prefix)))
214                 dst = cp;
215         return xstrdup(dst);
216 }
217
218 static int append_ref(const char *refname, const unsigned char *sha1, int flags, void *cb_data)
219 {
220         struct ref_list *ref_list = (struct ref_list*)(cb_data);
221         struct ref_item *newitem;
222         struct commit *commit;
223         int kind, i;
224         const char *prefix, *orig_refname = refname;
225
226         static struct {
227                 int kind;
228                 const char *prefix;
229                 int pfxlen;
230         } ref_kind[] = {
231                 { REF_LOCAL_BRANCH, "refs/heads/", 11 },
232                 { REF_REMOTE_BRANCH, "refs/remotes/", 13 },
233         };
234
235         /* Detect kind */
236         for (i = 0; i < ARRAY_SIZE(ref_kind); i++) {
237                 prefix = ref_kind[i].prefix;
238                 if (strncmp(refname, prefix, ref_kind[i].pfxlen))
239                         continue;
240                 kind = ref_kind[i].kind;
241                 refname += ref_kind[i].pfxlen;
242                 break;
243         }
244         if (ARRAY_SIZE(ref_kind) <= i)
245                 return 0;
246
247         commit = lookup_commit_reference_gently(sha1, 1);
248         if (!commit)
249                 return error("branch '%s' does not point at a commit", refname);
250
251         /* Filter with with_commit if specified */
252         if (!is_descendant_of(commit, ref_list->with_commit))
253                 return 0;
254
255         /* Don't add types the caller doesn't want */
256         if ((kind & ref_list->kinds) == 0)
257                 return 0;
258
259         if (merge_filter != NO_FILTER)
260                 add_pending_object(&ref_list->revs,
261                                    (struct object *)commit, refname);
262
263         /* Resize buffer */
264         if (ref_list->index >= ref_list->alloc) {
265                 ref_list->alloc = alloc_nr(ref_list->alloc);
266                 ref_list->list = xrealloc(ref_list->list,
267                                 ref_list->alloc * sizeof(struct ref_item));
268         }
269
270         /* Record the new item */
271         newitem = &(ref_list->list[ref_list->index++]);
272         newitem->name = xstrdup(refname);
273         newitem->kind = kind;
274         newitem->commit = commit;
275         newitem->len = strlen(refname);
276         newitem->dest = resolve_symref(orig_refname, prefix);
277         /* adjust for "remotes/" */
278         if (newitem->kind == REF_REMOTE_BRANCH &&
279             ref_list->kinds != REF_REMOTE_BRANCH)
280                 newitem->len += 8;
281         if (newitem->len > ref_list->maxwidth)
282                 ref_list->maxwidth = newitem->len;
283
284         return 0;
285 }
286
287 static void free_ref_list(struct ref_list *ref_list)
288 {
289         int i;
290
291         for (i = 0; i < ref_list->index; i++) {
292                 free(ref_list->list[i].name);
293                 free(ref_list->list[i].dest);
294         }
295         free(ref_list->list);
296 }
297
298 static int ref_cmp(const void *r1, const void *r2)
299 {
300         struct ref_item *c1 = (struct ref_item *)(r1);
301         struct ref_item *c2 = (struct ref_item *)(r2);
302
303         if (c1->kind != c2->kind)
304                 return c1->kind - c2->kind;
305         return strcmp(c1->name, c2->name);
306 }
307
308 static void fill_tracking_info(struct strbuf *stat, const char *branch_name)
309 {
310         int ours, theirs;
311         struct branch *branch = branch_get(branch_name);
312
313         if (!stat_tracking_info(branch, &ours, &theirs) || (!ours && !theirs))
314                 return;
315         if (!ours)
316                 strbuf_addf(stat, "[behind %d] ", theirs);
317         else if (!theirs)
318                 strbuf_addf(stat, "[ahead %d] ", ours);
319         else
320                 strbuf_addf(stat, "[ahead %d, behind %d] ", ours, theirs);
321 }
322
323 static int matches_merge_filter(struct commit *commit)
324 {
325         int is_merged;
326
327         if (merge_filter == NO_FILTER)
328                 return 1;
329
330         is_merged = !!(commit->object.flags & UNINTERESTING);
331         return (is_merged == (merge_filter == SHOW_MERGED));
332 }
333
334 static void print_ref_item(struct ref_item *item, int maxwidth, int verbose,
335                            int abbrev, int current, char *prefix)
336 {
337         char c;
338         int color;
339         struct commit *commit = item->commit;
340         struct strbuf out = STRBUF_INIT, name = STRBUF_INIT;
341
342         if (!matches_merge_filter(commit))
343                 return;
344
345         switch (item->kind) {
346         case REF_LOCAL_BRANCH:
347                 color = BRANCH_COLOR_LOCAL;
348                 break;
349         case REF_REMOTE_BRANCH:
350                 color = BRANCH_COLOR_REMOTE;
351                 break;
352         default:
353                 color = BRANCH_COLOR_PLAIN;
354                 break;
355         }
356
357         c = ' ';
358         if (current) {
359                 c = '*';
360                 color = BRANCH_COLOR_CURRENT;
361         }
362
363         strbuf_addf(&name, "%s%s", prefix, item->name);
364         if (verbose)
365                 strbuf_addf(&out, "%c %s%-*s%s", c, branch_get_color(color),
366                             maxwidth, name.buf,
367                             branch_get_color(BRANCH_COLOR_RESET));
368         else
369                 strbuf_addf(&out, "%c %s%s%s", c, branch_get_color(color),
370                             name.buf, branch_get_color(BRANCH_COLOR_RESET));
371
372         if (item->dest)
373                 strbuf_addf(&out, " -> %s", item->dest);
374         else if (verbose) {
375                 struct strbuf subject = STRBUF_INIT, stat = STRBUF_INIT;
376                 const char *sub = " **** invalid ref ****";
377
378                 commit = item->commit;
379                 if (commit && !parse_commit(commit)) {
380                         pretty_print_commit(CMIT_FMT_ONELINE, commit,
381                                             &subject, 0, NULL, NULL, 0, 0);
382                         sub = subject.buf;
383                 }
384
385                 if (item->kind == REF_LOCAL_BRANCH)
386                         fill_tracking_info(&stat, item->name);
387
388                 strbuf_addf(&out, " %s %s%s",
389                         find_unique_abbrev(item->commit->object.sha1, abbrev),
390                         stat.buf, sub);
391                 strbuf_release(&stat);
392                 strbuf_release(&subject);
393         }
394         printf("%s\n", out.buf);
395         strbuf_release(&name);
396         strbuf_release(&out);
397 }
398
399 static int calc_maxwidth(struct ref_list *refs)
400 {
401         int i, w = 0;
402         for (i = 0; i < refs->index; i++) {
403                 if (!matches_merge_filter(refs->list[i].commit))
404                         continue;
405                 if (refs->list[i].len > w)
406                         w = refs->list[i].len;
407         }
408         return w;
409 }
410
411 static void print_ref_list(int kinds, int detached, int verbose, int abbrev, struct commit_list *with_commit)
412 {
413         int i;
414         struct ref_list ref_list;
415         struct commit *head_commit = lookup_commit_reference_gently(head_sha1, 1);
416
417         memset(&ref_list, 0, sizeof(ref_list));
418         ref_list.kinds = kinds;
419         ref_list.with_commit = with_commit;
420         if (merge_filter != NO_FILTER)
421                 init_revisions(&ref_list.revs, NULL);
422         for_each_ref(append_ref, &ref_list);
423         if (merge_filter != NO_FILTER) {
424                 struct commit *filter;
425                 filter = lookup_commit_reference_gently(merge_filter_ref, 0);
426                 filter->object.flags |= UNINTERESTING;
427                 add_pending_object(&ref_list.revs,
428                                    (struct object *) filter, "");
429                 ref_list.revs.limited = 1;
430                 prepare_revision_walk(&ref_list.revs);
431                 if (verbose)
432                         ref_list.maxwidth = calc_maxwidth(&ref_list);
433         }
434
435         qsort(ref_list.list, ref_list.index, sizeof(struct ref_item), ref_cmp);
436
437         detached = (detached && (kinds & REF_LOCAL_BRANCH));
438         if (detached && head_commit &&
439             is_descendant_of(head_commit, with_commit)) {
440                 struct ref_item item;
441                 item.name = xstrdup("(no branch)");
442                 item.len = strlen(item.name);
443                 item.kind = REF_LOCAL_BRANCH;
444                 item.dest = NULL;
445                 item.commit = head_commit;
446                 if (item.len > ref_list.maxwidth)
447                         ref_list.maxwidth = item.len;
448                 print_ref_item(&item, ref_list.maxwidth, verbose, abbrev, 1, "");
449                 free(item.name);
450         }
451
452         for (i = 0; i < ref_list.index; i++) {
453                 int current = !detached &&
454                         (ref_list.list[i].kind == REF_LOCAL_BRANCH) &&
455                         !strcmp(ref_list.list[i].name, head);
456                 char *prefix = (kinds != REF_REMOTE_BRANCH &&
457                                 ref_list.list[i].kind == REF_REMOTE_BRANCH)
458                                 ? "remotes/" : "";
459                 print_ref_item(&ref_list.list[i], ref_list.maxwidth, verbose,
460                                abbrev, current, prefix);
461         }
462
463         free_ref_list(&ref_list);
464 }
465
466 static void rename_branch(const char *oldname, const char *newname, int force)
467 {
468         struct strbuf oldref = STRBUF_INIT, newref = STRBUF_INIT, logmsg = STRBUF_INIT;
469         unsigned char sha1[20];
470         struct strbuf oldsection = STRBUF_INIT, newsection = STRBUF_INIT;
471
472         if (!oldname)
473                 die("cannot rename the current branch while not on any.");
474
475         strbuf_addf(&oldref, "refs/heads/%s", oldname);
476
477         if (check_ref_format(oldref.buf))
478                 die("Invalid branch name: %s", oldref.buf);
479
480         strbuf_addf(&newref, "refs/heads/%s", newname);
481
482         if (check_ref_format(newref.buf))
483                 die("Invalid branch name: %s", newref.buf);
484
485         if (resolve_ref(newref.buf, sha1, 1, NULL) && !force)
486                 die("A branch named '%s' already exists.", newname);
487
488         strbuf_addf(&logmsg, "Branch: renamed %s to %s",
489                  oldref.buf, newref.buf);
490
491         if (rename_ref(oldref.buf, newref.buf, logmsg.buf))
492                 die("Branch rename failed");
493         strbuf_release(&logmsg);
494
495         /* no need to pass logmsg here as HEAD didn't really move */
496         if (!strcmp(oldname, head) && create_symref("HEAD", newref.buf, NULL))
497                 die("Branch renamed to %s, but HEAD is not updated!", newname);
498
499         strbuf_addf(&oldsection, "branch.%s", oldref.buf + 11);
500         strbuf_release(&oldref);
501         strbuf_addf(&newsection, "branch.%s", newref.buf + 11);
502         strbuf_release(&newref);
503         if (git_config_rename_section(oldsection.buf, newsection.buf) < 0)
504                 die("Branch is renamed, but update of config-file failed");
505         strbuf_release(&oldsection);
506         strbuf_release(&newsection);
507 }
508
509 static int opt_parse_merge_filter(const struct option *opt, const char *arg, int unset)
510 {
511         merge_filter = ((opt->long_name[0] == 'n')
512                         ? SHOW_NOT_MERGED
513                         : SHOW_MERGED);
514         if (unset)
515                 merge_filter = SHOW_NOT_MERGED; /* b/c for --no-merged */
516         if (!arg)
517                 arg = "HEAD";
518         if (get_sha1(arg, merge_filter_ref))
519                 die("malformed object name %s", arg);
520         return 0;
521 }
522
523 int cmd_branch(int argc, const char **argv, const char *prefix)
524 {
525         int delete = 0, rename = 0, force_create = 0;
526         int verbose = 0, abbrev = DEFAULT_ABBREV, detached = 0;
527         int reflog = 0;
528         enum branch_track track;
529         int kinds = REF_LOCAL_BRANCH;
530         struct commit_list *with_commit = NULL;
531
532         struct option options[] = {
533                 OPT_GROUP("Generic options"),
534                 OPT__VERBOSE(&verbose),
535                 OPT_SET_INT( 0 , "track",  &track, "set up tracking mode (see git-pull(1))",
536                         BRANCH_TRACK_EXPLICIT),
537                 OPT_BOOLEAN( 0 , "color",  &branch_use_color, "use colored output"),
538                 OPT_SET_INT('r', NULL,     &kinds, "act on remote-tracking branches",
539                         REF_REMOTE_BRANCH),
540                 {
541                         OPTION_CALLBACK, 0, "contains", &with_commit, "commit",
542                         "print only branches that contain the commit",
543                         PARSE_OPT_LASTARG_DEFAULT,
544                         parse_opt_with_commit, (intptr_t)"HEAD",
545                 },
546                 {
547                         OPTION_CALLBACK, 0, "with", &with_commit, "commit",
548                         "print only branches that contain the commit",
549                         PARSE_OPT_HIDDEN | PARSE_OPT_LASTARG_DEFAULT,
550                         parse_opt_with_commit, (intptr_t) "HEAD",
551                 },
552                 OPT__ABBREV(&abbrev),
553
554                 OPT_GROUP("Specific git-branch actions:"),
555                 OPT_SET_INT('a', NULL, &kinds, "list both remote-tracking and local branches",
556                         REF_REMOTE_BRANCH | REF_LOCAL_BRANCH),
557                 OPT_BIT('d', NULL, &delete, "delete fully merged branch", 1),
558                 OPT_BIT('D', NULL, &delete, "delete branch (even if not merged)", 2),
559                 OPT_BIT('m', NULL, &rename, "move/rename a branch and its reflog", 1),
560                 OPT_BIT('M', NULL, &rename, "move/rename a branch, even if target exists", 2),
561                 OPT_BOOLEAN('l', NULL, &reflog, "create the branch's reflog"),
562                 OPT_BOOLEAN('f', NULL, &force_create, "force creation (when already exists)"),
563                 {
564                         OPTION_CALLBACK, 0, "no-merged", &merge_filter_ref,
565                         "commit", "print only not merged branches",
566                         PARSE_OPT_LASTARG_DEFAULT | PARSE_OPT_NONEG,
567                         opt_parse_merge_filter, (intptr_t) "HEAD",
568                 },
569                 {
570                         OPTION_CALLBACK, 0, "merged", &merge_filter_ref,
571                         "commit", "print only merged branches",
572                         PARSE_OPT_LASTARG_DEFAULT | PARSE_OPT_NONEG,
573                         opt_parse_merge_filter, (intptr_t) "HEAD",
574                 },
575                 OPT_END(),
576         };
577
578         git_config(git_branch_config, NULL);
579
580         if (branch_use_color == -1)
581                 branch_use_color = git_use_color_default;
582
583         track = git_branch_track;
584
585         head = resolve_ref("HEAD", head_sha1, 0, NULL);
586         if (!head)
587                 die("Failed to resolve HEAD as a valid ref.");
588         head = xstrdup(head);
589         if (!strcmp(head, "HEAD")) {
590                 detached = 1;
591         } else {
592                 if (prefixcmp(head, "refs/heads/"))
593                         die("HEAD not found below refs/heads!");
594                 head += 11;
595         }
596         hashcpy(merge_filter_ref, head_sha1);
597
598         argc = parse_options(argc, argv, options, builtin_branch_usage, 0);
599         if (!!delete + !!rename + !!force_create > 1)
600                 usage_with_options(builtin_branch_usage, options);
601
602         if (delete)
603                 return delete_branches(argc, argv, delete > 1, kinds);
604         else if (argc == 0)
605                 print_ref_list(kinds, detached, verbose, abbrev, with_commit);
606         else if (rename && (argc == 1))
607                 rename_branch(head, argv[0], rename > 1);
608         else if (rename && (argc == 2))
609                 rename_branch(argv[0], argv[1], rename > 1);
610         else if (argc <= 2)
611                 create_branch(head, argv[0], (argc == 2) ? argv[1] : head,
612                               force_create, reflog, track);
613         else
614                 usage_with_options(builtin_branch_usage, options);
615
616         return 0;
617 }