aboutsummaryrefslogtreecommitdiff
path: root/builtin-branch.c
blob: 903d5cf05600f9a7e297dc9450ad5980388072e9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
/*
 * Builtin "git branch"
 *
 * Copyright (c) 2006 Kristian H�gsberg <krh@redhat.com>
 * Based on git-branch.sh by Junio C Hamano.
 */

#include "cache.h"
#include "color.h"
#include "refs.h"
#include "commit.h"
#include "builtin.h"

static const char builtin_branch_usage[] =
  "git-branch [-r] (-d | -D) <branchname> | [-l] [-f] <branchname> [<start-point>] | (-m | -M) [<oldbranch>] <newbranch> | [-r | -a] [-v [--abbrev=<length>]]";

#define REF_UNKNOWN_TYPE    0x00
#define REF_LOCAL_BRANCH    0x01
#define REF_REMOTE_BRANCH   0x02
#define REF_TAG             0x04

static const char *head;
static unsigned char head_sha1[20];

static int branch_use_color;
static char branch_colors[][COLOR_MAXLEN] = {
	"\033[m",	/* reset */
	"",		/* PLAIN (normal) */
	"\033[31m",	/* REMOTE (red) */
	"",		/* LOCAL (normal) */
	"\033[32m",	/* CURRENT (green) */
};
enum color_branch {
	COLOR_BRANCH_RESET = 0,
	COLOR_BRANCH_PLAIN = 1,
	COLOR_BRANCH_REMOTE = 2,
	COLOR_BRANCH_LOCAL = 3,
	COLOR_BRANCH_CURRENT = 4,
};

static int parse_branch_color_slot(const char *var, int ofs)
{
	if (!strcasecmp(var+ofs, "plain"))
		return COLOR_BRANCH_PLAIN;
	if (!strcasecmp(var+ofs, "reset"))
		return COLOR_BRANCH_RESET;
	if (!strcasecmp(var+ofs, "remote"))
		return COLOR_BRANCH_REMOTE;
	if (!strcasecmp(var+ofs, "local"))
		return COLOR_BRANCH_LOCAL;
	if (!strcasecmp(var+ofs, "current"))
		return COLOR_BRANCH_CURRENT;
	die("bad config variable '%s'", var);
}

int git_branch_config(const char *var, const char *value)
{
	if (!strcmp(var, "color.branch")) {
		branch_use_color = git_config_colorbool(var, value);
		return 0;
	}
	if (!strncmp(var, "color.branch.", 13)) {
		int slot = parse_branch_color_slot(var, 13);
		color_parse(value, var, branch_colors[slot]);
		return 0;
	}
	return git_default_config(var, value);
}

const char *branch_get_color(enum color_branch ix)
{
	if (branch_use_color)
		return branch_colors[ix];
	return "";
}

static int in_merge_bases(const unsigned char *sha1,
			  struct commit *rev1,
			  struct commit *rev2)
{
	struct commit_list *bases, *b;
	int ret = 0;

	bases = get_merge_bases(rev1, rev2, 1);
	for (b = bases; b; b = b->next) {
		if (!hashcmp(sha1, b->item->object.sha1)) {
			ret = 1;
			break;
		}
	}

	free_commit_list(bases);
	return ret;
}

static int delete_branches(int argc, const char **argv, int force, int kinds)
{
	struct commit *rev, *head_rev = head_rev;
	unsigned char sha1[20];
	char *name = NULL;
	const char *fmt, *remote;
	int i;
	int ret = 0;

	switch (kinds) {
	case REF_REMOTE_BRANCH:
		fmt = "refs/remotes/%s";
		remote = "remote ";
		force = 1;
		break;
	case REF_LOCAL_BRANCH:
		fmt = "refs/heads/%s";
		remote = "";
		break;
	default:
		die("cannot use -a with -d");
	}

	if (!force) {
		head_rev = lookup_commit_reference(head_sha1);
		if (!head_rev)
			die("Couldn't look up commit object for HEAD");
	}
	for (i = 0; i < argc; i++) {
		if (kinds == REF_LOCAL_BRANCH && !strcmp(head, argv[i])) {
			error("Cannot delete the branch '%s' "
				"which you are currently on.", argv[i]);
			ret = 1;
			continue;
		}

		if (name)
			free(name);

		name = xstrdup(mkpath(fmt, argv[i]));
		if (!resolve_ref(name, sha1, 1, NULL)) {
			error("%sbranch '%s' not found.",
					remote, argv[i]);
			ret = 1;
			continue;
		}

		rev = lookup_commit_reference(sha1);
		if (!rev) {
			error("Couldn't look up commit object for '%s'", name);
			ret = 1;
			continue;
		}

		/* This checks whether the merge bases of branch and
		 * HEAD contains branch -- which means that the HEAD
		 * contains everything in both.
		 */

		if (!force &&
		    !in_merge_bases(sha1, rev, head_rev)) {
			error("The branch '%s' is not a strict subset of "
				"your current HEAD.\n"
				"If you are sure you want to delete it, "
				"run 'git branch -D %s'.", argv[i], argv[i]);
			ret = 1;
			continue;
		}

		if (delete_ref(name, sha1)) {
			error("Error deleting %sbranch '%s'", remote,
			       argv[i]);
			ret = 1;
		} else
			printf("Deleted %sbranch %s.\n", remote, argv[i]);

	}

	if (name)
		free(name);

	return(ret);
}

struct ref_item {
	char *name;
	unsigned int kind;
	unsigned char sha1[20];
};

struct ref_list {
	int index, alloc, maxwidth;
	struct ref_item *list;
	int kinds;
};

static int append_ref(const char *refname, const unsigned char *sha1, int flags, void *cb_data)
{
	struct ref_list *ref_list = (struct ref_list*)(cb_data);
	struct ref_item *newitem;
	int kind = REF_UNKNOWN_TYPE;
	int len;

	/* Detect kind */
	if (!strncmp(refname, "refs/heads/", 11)) {
		kind = REF_LOCAL_BRANCH;
		refname += 11;
	} else if (!strncmp(refname, "refs/remotes/", 13)) {
		kind = REF_REMOTE_BRANCH;
		refname += 13;
	} else if (!strncmp(refname, "refs/tags/", 10)) {
		kind = REF_TAG;
		refname += 10;
	}

	/* Don't add types the caller doesn't want */
	if ((kind & ref_list->kinds) == 0)
		return 0;

	/* Resize buffer */
	if (ref_list->index >= ref_list->alloc) {
		ref_list->alloc = alloc_nr(ref_list->alloc);
		ref_list->list = xrealloc(ref_list->list,
				ref_list->alloc * sizeof(struct ref_item));
	}

	/* Record the new item */
	newitem = &(ref_list->list[ref_list->index++]);
	newitem->name = xstrdup(refname);
	newitem->kind = kind;
	hashcpy(newitem->sha1, sha1);
	len = strlen(newitem->name);
	if (len > ref_list->maxwidth)
		ref_list->maxwidth = len;

	return 0;
}

static void free_ref_list(struct ref_list *ref_list)
{
	int i;

	for (i = 0; i < ref_list->index; i++)
		free(ref_list->list[i].name);
	free(ref_list->list);
}

static int ref_cmp(const void *r1, const void *r2)
{
	struct ref_item *c1 = (struct ref_item *)(r1);
	struct ref_item *c2 = (struct ref_item *)(r2);

	if (c1->kind != c2->kind)
		return c1->kind - c2->kind;
	return strcmp(c1->name, c2->name);
}

static void print_ref_info(const unsigned char *sha1, int abbrev)
{
	struct commit *commit;
	char subject[256];


	commit = lookup_commit(sha1);
	if (commit && !parse_commit(commit))
		pretty_print_commit(CMIT_FMT_ONELINE, commit, ~0,
				    subject, sizeof(subject), 0,
				    NULL, NULL, 0);
	else
		strcpy(subject, " **** invalid ref ****");

	printf(" %s %s\n", find_unique_abbrev(sha1, abbrev), subject);
}

static void print_ref_list(int kinds, int verbose, int abbrev)
{
	int i;
	char c;
	struct ref_list ref_list;
	int color;

	memset(&ref_list, 0, sizeof(ref_list));
	ref_list.kinds = kinds;
	for_each_ref(append_ref, &ref_list);

	qsort(ref_list.list, ref_list.index, sizeof(struct ref_item), ref_cmp);

	for (i = 0; i < ref_list.index; i++) {
		switch( ref_list.list[i].kind ) {
			case REF_LOCAL_BRANCH:
				color = COLOR_BRANCH_LOCAL;
				break;
			case REF_REMOTE_BRANCH:
				color = COLOR_BRANCH_REMOTE;
				break;
			default:
				color = COLOR_BRANCH_PLAIN;
				break;
		}

		c = ' ';
		if (ref_list.list[i].kind == REF_LOCAL_BRANCH &&
				!strcmp(ref_list.list[i].name, head)) {
			c = '*';
			color = COLOR_BRANCH_CURRENT;
		}

		if (verbose) {
			printf("%c %s%-*s%s", c,
					branch_get_color(color),
					ref_list.maxwidth,
					ref_list.list[i].name,
					branch_get_color(COLOR_BRANCH_RESET));
			print_ref_info(ref_list.list[i].sha1, abbrev);
		}
		else
			printf("%c %s%s%s\n", c,
					branch_get_color(color),
					ref_list.list[i].name,
					branch_get_color(COLOR_BRANCH_RESET));
	}

	free_ref_list(&ref_list);
}

static void create_branch(const char *name, const char *start,
			  int force, int reflog)
{
	struct ref_lock *lock;
	struct commit *commit;
	unsigned char sha1[20];
	char ref[PATH_MAX], msg[PATH_MAX + 20];

	snprintf(ref, sizeof ref, "refs/heads/%s", name);
	if (check_ref_format(ref))
		die("'%s' is not a valid branch name.", name);

	if (resolve_ref(ref, sha1, 1, NULL)) {
		if (!force)
			die("A branch named '%s' already exists.", name);
		else if (!strcmp(head, name))
			die("Cannot force update the current branch.");
	}

	if (get_sha1(start, sha1) ||
	    (commit = lookup_commit_reference(sha1)) == NULL)
		die("Not a valid branch point: '%s'.", start);
	hashcpy(sha1, commit->object.sha1);

	lock = lock_any_ref_for_update(ref, NULL);
	if (!lock)
		die("Failed to lock ref for update: %s.", strerror(errno));

	if (reflog) {
		log_all_ref_updates = 1;
		snprintf(msg, sizeof msg, "branch: Created from %s", start);
	}

	if (write_ref_sha1(lock, sha1, msg) < 0)
		die("Failed to write ref: %s.", strerror(errno));
}

static void rename_branch(const char *oldname, const char *newname, int force)
{
	char oldref[PATH_MAX], newref[PATH_MAX], logmsg[PATH_MAX*2 + 100];
	unsigned char sha1[20];

	if (snprintf(oldref, sizeof(oldref), "refs/heads/%s", oldname) > sizeof(oldref))
		die("Old branchname too long");

	if (check_ref_format(oldref))
		die("Invalid branch name: %s", oldref);

	if (snprintf(newref, sizeof(newref), "refs/heads/%s", newname) > sizeof(newref))
		die("New branchname too long");

	if (check_ref_format(newref))
		die("Invalid branch name: %s", newref);

	if (resolve_ref(newref, sha1, 1, NULL) && !force)
		die("A branch named '%s' already exists.", newname);

	snprintf(logmsg, sizeof(logmsg), "Branch: renamed %s to %s",
		 oldref, newref);

	if (rename_ref(oldref, newref, logmsg))
		die("Branch rename failed");

	if (!strcmp(oldname, head) && create_symref("HEAD", newref))
		die("Branch renamed to %s, but HEAD is not updated!", newname);
}

int cmd_branch(int argc, const char **argv, const char *prefix)
{
	int delete = 0, force_delete = 0, force_create = 0;
	int rename = 0, force_rename = 0;
	int verbose = 0, abbrev = DEFAULT_ABBREV;
	int reflog = 0;
	int kinds = REF_LOCAL_BRANCH;
	int i;

	setup_ident();
	git_config(git_branch_config);

	for (i = 1; i < argc; i++) {
		const char *arg = argv[i];

		if (arg[0] != '-')
			break;
		if (!strcmp(arg, "--")) {
			i++;
			break;
		}
		if (!strcmp(arg, "-d")) {
			delete = 1;
			continue;
		}
		if (!strcmp(arg, "-D")) {
			delete = 1;
			force_delete = 1;
			continue;
		}
		if (!strcmp(arg, "-f")) {
			force_create = 1;
			continue;
		}
		if (!strcmp(arg, "-m")) {
			rename = 1;
			continue;
		}
		if (!strcmp(arg, "-M")) {
			rename = 1;
			force_rename = 1;
			continue;
		}
		if (!strcmp(arg, "-r")) {
			kinds = REF_REMOTE_BRANCH;
			continue;
		}
		if (!strcmp(arg, "-a")) {
			kinds = REF_REMOTE_BRANCH | REF_LOCAL_BRANCH;
			continue;
		}
		if (!strcmp(arg, "-l")) {
			reflog = 1;
			continue;
		}
		if (!strncmp(arg, "--abbrev=", 9)) {
			abbrev = atoi(arg+9);
			continue;
		}
		if (!strcmp(arg, "-v")) {
			verbose = 1;
			continue;
		}
		if (!strcmp(arg, "--color")) {
			branch_use_color = 1;
			continue;
		}
		if (!strcmp(arg, "--no-color")) {
			branch_use_color = 0;
			continue;
		}
		usage(builtin_branch_usage);
	}

	if ((delete && rename) || (delete && force_create) ||
	    (rename && force_create))
		usage(builtin_branch_usage);

	head = xstrdup(resolve_ref("HEAD", head_sha1, 0, NULL));
	if (!head)
		die("Failed to resolve HEAD as a valid ref.");
	if (strncmp(head, "refs/heads/", 11))
		die("HEAD not found below refs/heads!");
	head += 11;

	if (delete)
		return delete_branches(argc - i, argv + i, force_delete, kinds);
	else if (i == argc)
		print_ref_list(kinds, verbose, abbrev);
	else if (rename && (i == argc - 1))
		rename_branch(head, argv[i], force_rename);
	else if (rename && (i == argc - 2))
		rename_branch(argv[i], argv[i + 1], force_rename);
	else if (i == argc - 1)
		create_branch(argv[i], head, force_create, reflog);
	else if (i == argc - 2)
		create_branch(argv[i], argv[i + 1], force_create, reflog);
	else
		usage(builtin_branch_usage);

	return 0;
}