Merge branch 'jc/fsck-reflog'
[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
14 static const char builtin_branch_usage[] =
15   "git-branch [-r] (-d | -D) <branchname> | [-l] [-f] <branchname> [<start-point>] | (-m | -M) [<oldbranch>] <newbranch> | [-r | -a] [-v [--abbrev=<length>]]";
16
17 #define REF_UNKNOWN_TYPE    0x00
18 #define REF_LOCAL_BRANCH    0x01
19 #define REF_REMOTE_BRANCH   0x02
20 #define REF_TAG             0x04
21
22 static const char *head;
23 static unsigned char head_sha1[20];
24
25 static int branch_use_color;
26 static char branch_colors[][COLOR_MAXLEN] = {
27         "\033[m",       /* reset */
28         "",             /* PLAIN (normal) */
29         "\033[31m",     /* REMOTE (red) */
30         "",             /* LOCAL (normal) */
31         "\033[32m",     /* CURRENT (green) */
32 };
33 enum color_branch {
34         COLOR_BRANCH_RESET = 0,
35         COLOR_BRANCH_PLAIN = 1,
36         COLOR_BRANCH_REMOTE = 2,
37         COLOR_BRANCH_LOCAL = 3,
38         COLOR_BRANCH_CURRENT = 4,
39 };
40
41 static int parse_branch_color_slot(const char *var, int ofs)
42 {
43         if (!strcasecmp(var+ofs, "plain"))
44                 return COLOR_BRANCH_PLAIN;
45         if (!strcasecmp(var+ofs, "reset"))
46                 return COLOR_BRANCH_RESET;
47         if (!strcasecmp(var+ofs, "remote"))
48                 return COLOR_BRANCH_REMOTE;
49         if (!strcasecmp(var+ofs, "local"))
50                 return COLOR_BRANCH_LOCAL;
51         if (!strcasecmp(var+ofs, "current"))
52                 return COLOR_BRANCH_CURRENT;
53         die("bad config variable '%s'", var);
54 }
55
56 int git_branch_config(const char *var, const char *value)
57 {
58         if (!strcmp(var, "color.branch")) {
59                 branch_use_color = git_config_colorbool(var, value);
60                 return 0;
61         }
62         if (!strncmp(var, "color.branch.", 13)) {
63                 int slot = parse_branch_color_slot(var, 13);
64                 color_parse(value, var, branch_colors[slot]);
65                 return 0;
66         }
67         return git_default_config(var, value);
68 }
69
70 const char *branch_get_color(enum color_branch ix)
71 {
72         if (branch_use_color)
73                 return branch_colors[ix];
74         return "";
75 }
76
77 static int delete_branches(int argc, const char **argv, int force, int kinds)
78 {
79         struct commit *rev, *head_rev = head_rev;
80         unsigned char sha1[20];
81         char *name = NULL;
82         const char *fmt, *remote;
83         int i;
84         int ret = 0;
85
86         switch (kinds) {
87         case REF_REMOTE_BRANCH:
88                 fmt = "refs/remotes/%s";
89                 remote = "remote ";
90                 force = 1;
91                 break;
92         case REF_LOCAL_BRANCH:
93                 fmt = "refs/heads/%s";
94                 remote = "";
95                 break;
96         default:
97                 die("cannot use -a with -d");
98         }
99
100         if (!force) {
101                 head_rev = lookup_commit_reference(head_sha1);
102                 if (!head_rev)
103                         die("Couldn't look up commit object for HEAD");
104         }
105         for (i = 0; i < argc; i++) {
106                 if (kinds == REF_LOCAL_BRANCH && !strcmp(head, argv[i])) {
107                         error("Cannot delete the branch '%s' "
108                                 "which you are currently on.", argv[i]);
109                         ret = 1;
110                         continue;
111                 }
112
113                 if (name)
114                         free(name);
115
116                 name = xstrdup(mkpath(fmt, argv[i]));
117                 if (!resolve_ref(name, sha1, 1, NULL)) {
118                         error("%sbranch '%s' not found.",
119                                         remote, argv[i]);
120                         ret = 1;
121                         continue;
122                 }
123
124                 rev = lookup_commit_reference(sha1);
125                 if (!rev) {
126                         error("Couldn't look up commit object for '%s'", name);
127                         ret = 1;
128                         continue;
129                 }
130
131                 /* This checks whether the merge bases of branch and
132                  * HEAD contains branch -- which means that the HEAD
133                  * contains everything in both.
134                  */
135
136                 if (!force &&
137                     !in_merge_bases(rev, head_rev)) {
138                         error("The branch '%s' is not a strict subset of "
139                                 "your current HEAD.\n"
140                                 "If you are sure you want to delete it, "
141                                 "run 'git branch -D %s'.", argv[i], argv[i]);
142                         ret = 1;
143                         continue;
144                 }
145
146                 if (delete_ref(name, sha1)) {
147                         error("Error deleting %sbranch '%s'", remote,
148                                argv[i]);
149                         ret = 1;
150                 } else
151                         printf("Deleted %sbranch %s.\n", remote, argv[i]);
152
153         }
154
155         if (name)
156                 free(name);
157
158         return(ret);
159 }
160
161 struct ref_item {
162         char *name;
163         unsigned int kind;
164         unsigned char sha1[20];
165 };
166
167 struct ref_list {
168         int index, alloc, maxwidth;
169         struct ref_item *list;
170         int kinds;
171 };
172
173 static int append_ref(const char *refname, const unsigned char *sha1, int flags, void *cb_data)
174 {
175         struct ref_list *ref_list = (struct ref_list*)(cb_data);
176         struct ref_item *newitem;
177         int kind = REF_UNKNOWN_TYPE;
178         int len;
179
180         /* Detect kind */
181         if (!strncmp(refname, "refs/heads/", 11)) {
182                 kind = REF_LOCAL_BRANCH;
183                 refname += 11;
184         } else if (!strncmp(refname, "refs/remotes/", 13)) {
185                 kind = REF_REMOTE_BRANCH;
186                 refname += 13;
187         } else if (!strncmp(refname, "refs/tags/", 10)) {
188                 kind = REF_TAG;
189                 refname += 10;
190         }
191
192         /* Don't add types the caller doesn't want */
193         if ((kind & ref_list->kinds) == 0)
194                 return 0;
195
196         /* Resize buffer */
197         if (ref_list->index >= ref_list->alloc) {
198                 ref_list->alloc = alloc_nr(ref_list->alloc);
199                 ref_list->list = xrealloc(ref_list->list,
200                                 ref_list->alloc * sizeof(struct ref_item));
201         }
202
203         /* Record the new item */
204         newitem = &(ref_list->list[ref_list->index++]);
205         newitem->name = xstrdup(refname);
206         newitem->kind = kind;
207         hashcpy(newitem->sha1, sha1);
208         len = strlen(newitem->name);
209         if (len > ref_list->maxwidth)
210                 ref_list->maxwidth = len;
211
212         return 0;
213 }
214
215 static void free_ref_list(struct ref_list *ref_list)
216 {
217         int i;
218
219         for (i = 0; i < ref_list->index; i++)
220                 free(ref_list->list[i].name);
221         free(ref_list->list);
222 }
223
224 static int ref_cmp(const void *r1, const void *r2)
225 {
226         struct ref_item *c1 = (struct ref_item *)(r1);
227         struct ref_item *c2 = (struct ref_item *)(r2);
228
229         if (c1->kind != c2->kind)
230                 return c1->kind - c2->kind;
231         return strcmp(c1->name, c2->name);
232 }
233
234 static void print_ref_info(const unsigned char *sha1, int abbrev)
235 {
236         struct commit *commit;
237         char subject[256];
238
239
240         commit = lookup_commit(sha1);
241         if (commit && !parse_commit(commit))
242                 pretty_print_commit(CMIT_FMT_ONELINE, commit, ~0,
243                                     subject, sizeof(subject), 0,
244                                     NULL, NULL, 0);
245         else
246                 strcpy(subject, " **** invalid ref ****");
247
248         printf(" %s %s\n", find_unique_abbrev(sha1, abbrev), subject);
249 }
250
251 static void print_ref_list(int kinds, int verbose, int abbrev)
252 {
253         int i;
254         char c;
255         struct ref_list ref_list;
256         int color;
257
258         memset(&ref_list, 0, sizeof(ref_list));
259         ref_list.kinds = kinds;
260         for_each_ref(append_ref, &ref_list);
261
262         qsort(ref_list.list, ref_list.index, sizeof(struct ref_item), ref_cmp);
263
264         for (i = 0; i < ref_list.index; i++) {
265                 switch( ref_list.list[i].kind ) {
266                         case REF_LOCAL_BRANCH:
267                                 color = COLOR_BRANCH_LOCAL;
268                                 break;
269                         case REF_REMOTE_BRANCH:
270                                 color = COLOR_BRANCH_REMOTE;
271                                 break;
272                         default:
273                                 color = COLOR_BRANCH_PLAIN;
274                                 break;
275                 }
276
277                 c = ' ';
278                 if (ref_list.list[i].kind == REF_LOCAL_BRANCH &&
279                                 !strcmp(ref_list.list[i].name, head)) {
280                         c = '*';
281                         color = COLOR_BRANCH_CURRENT;
282                 }
283
284                 if (verbose) {
285                         printf("%c %s%-*s%s", c,
286                                         branch_get_color(color),
287                                         ref_list.maxwidth,
288                                         ref_list.list[i].name,
289                                         branch_get_color(COLOR_BRANCH_RESET));
290                         print_ref_info(ref_list.list[i].sha1, abbrev);
291                 }
292                 else
293                         printf("%c %s%s%s\n", c,
294                                         branch_get_color(color),
295                                         ref_list.list[i].name,
296                                         branch_get_color(COLOR_BRANCH_RESET));
297         }
298
299         free_ref_list(&ref_list);
300 }
301
302 static void create_branch(const char *name, const char *start,
303                           int force, int reflog)
304 {
305         struct ref_lock *lock;
306         struct commit *commit;
307         unsigned char sha1[20];
308         char ref[PATH_MAX], msg[PATH_MAX + 20];
309
310         snprintf(ref, sizeof ref, "refs/heads/%s", name);
311         if (check_ref_format(ref))
312                 die("'%s' is not a valid branch name.", name);
313
314         if (resolve_ref(ref, sha1, 1, NULL)) {
315                 if (!force)
316                         die("A branch named '%s' already exists.", name);
317                 else if (!strcmp(head, name))
318                         die("Cannot force update the current branch.");
319         }
320
321         if (get_sha1(start, sha1) ||
322             (commit = lookup_commit_reference(sha1)) == NULL)
323                 die("Not a valid branch point: '%s'.", start);
324         hashcpy(sha1, commit->object.sha1);
325
326         lock = lock_any_ref_for_update(ref, NULL);
327         if (!lock)
328                 die("Failed to lock ref for update: %s.", strerror(errno));
329
330         if (reflog) {
331                 log_all_ref_updates = 1;
332                 snprintf(msg, sizeof msg, "branch: Created from %s", start);
333         }
334
335         if (write_ref_sha1(lock, sha1, msg) < 0)
336                 die("Failed to write ref: %s.", strerror(errno));
337 }
338
339 static void rename_branch(const char *oldname, const char *newname, int force)
340 {
341         char oldref[PATH_MAX], newref[PATH_MAX], logmsg[PATH_MAX*2 + 100];
342         unsigned char sha1[20];
343
344         if (snprintf(oldref, sizeof(oldref), "refs/heads/%s", oldname) > sizeof(oldref))
345                 die("Old branchname too long");
346
347         if (check_ref_format(oldref))
348                 die("Invalid branch name: %s", oldref);
349
350         if (snprintf(newref, sizeof(newref), "refs/heads/%s", newname) > sizeof(newref))
351                 die("New branchname too long");
352
353         if (check_ref_format(newref))
354                 die("Invalid branch name: %s", newref);
355
356         if (resolve_ref(newref, sha1, 1, NULL) && !force)
357                 die("A branch named '%s' already exists.", newname);
358
359         snprintf(logmsg, sizeof(logmsg), "Branch: renamed %s to %s",
360                  oldref, newref);
361
362         if (rename_ref(oldref, newref, logmsg))
363                 die("Branch rename failed");
364
365         if (!strcmp(oldname, head) && create_symref("HEAD", newref))
366                 die("Branch renamed to %s, but HEAD is not updated!", newname);
367 }
368
369 int cmd_branch(int argc, const char **argv, const char *prefix)
370 {
371         int delete = 0, force_delete = 0, force_create = 0;
372         int rename = 0, force_rename = 0;
373         int verbose = 0, abbrev = DEFAULT_ABBREV;
374         int reflog = 0;
375         int kinds = REF_LOCAL_BRANCH;
376         int i;
377
378         setup_ident();
379         git_config(git_branch_config);
380
381         for (i = 1; i < argc; i++) {
382                 const char *arg = argv[i];
383
384                 if (arg[0] != '-')
385                         break;
386                 if (!strcmp(arg, "--")) {
387                         i++;
388                         break;
389                 }
390                 if (!strcmp(arg, "-d")) {
391                         delete = 1;
392                         continue;
393                 }
394                 if (!strcmp(arg, "-D")) {
395                         delete = 1;
396                         force_delete = 1;
397                         continue;
398                 }
399                 if (!strcmp(arg, "-f")) {
400                         force_create = 1;
401                         continue;
402                 }
403                 if (!strcmp(arg, "-m")) {
404                         rename = 1;
405                         continue;
406                 }
407                 if (!strcmp(arg, "-M")) {
408                         rename = 1;
409                         force_rename = 1;
410                         continue;
411                 }
412                 if (!strcmp(arg, "-r")) {
413                         kinds = REF_REMOTE_BRANCH;
414                         continue;
415                 }
416                 if (!strcmp(arg, "-a")) {
417                         kinds = REF_REMOTE_BRANCH | REF_LOCAL_BRANCH;
418                         continue;
419                 }
420                 if (!strcmp(arg, "-l")) {
421                         reflog = 1;
422                         continue;
423                 }
424                 if (!strncmp(arg, "--abbrev=", 9)) {
425                         abbrev = atoi(arg+9);
426                         continue;
427                 }
428                 if (!strcmp(arg, "-v")) {
429                         verbose = 1;
430                         continue;
431                 }
432                 if (!strcmp(arg, "--color")) {
433                         branch_use_color = 1;
434                         continue;
435                 }
436                 if (!strcmp(arg, "--no-color")) {
437                         branch_use_color = 0;
438                         continue;
439                 }
440                 usage(builtin_branch_usage);
441         }
442
443         if ((delete && rename) || (delete && force_create) ||
444             (rename && force_create))
445                 usage(builtin_branch_usage);
446
447         head = xstrdup(resolve_ref("HEAD", head_sha1, 0, NULL));
448         if (!head)
449                 die("Failed to resolve HEAD as a valid ref.");
450         if (strncmp(head, "refs/heads/", 11))
451                 die("HEAD not found below refs/heads!");
452         head += 11;
453
454         if (delete)
455                 return delete_branches(argc - i, argv + i, force_delete, kinds);
456         else if (i == argc)
457                 print_ref_list(kinds, verbose, abbrev);
458         else if (rename && (i == argc - 1))
459                 rename_branch(head, argv[i], force_rename);
460         else if (rename && (i == argc - 2))
461                 rename_branch(argv[i], argv[i + 1], force_rename);
462         else if (i == argc - 1)
463                 create_branch(argv[i], head, force_create, reflog);
464         else if (i == argc - 2)
465                 create_branch(argv[i], argv[i + 1], force_create, reflog);
466         else
467                 usage(builtin_branch_usage);
468
469         return 0;
470 }