aboutsummaryrefslogtreecommitdiff
path: root/builtin/rev-list.c
blob: ab3be7ca82ea36fbb1e98f8b899970a6748981c6 (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
#include "cache.h"
#include "commit.h"
#include "diff.h"
#include "revision.h"
#include "list-objects.h"
#include "builtin.h"
#include "log-tree.h"
#include "graph.h"
#include "bisect.h"

static const char rev_list_usage[] =
"git rev-list [OPTION] <commit-id>... [ -- paths... ]\n"
"  limiting output:\n"
"    --max-count=<n>\n"
"    --max-age=<epoch>\n"
"    --min-age=<epoch>\n"
"    --sparse\n"
"    --no-merges\n"
"    --min-parents=<n>\n"
"    --no-min-parents\n"
"    --max-parents=<n>\n"
"    --no-max-parents\n"
"    --remove-empty\n"
"    --all\n"
"    --branches\n"
"    --tags\n"
"    --remotes\n"
"    --stdin\n"
"    --quiet\n"
"  ordering output:\n"
"    --topo-order\n"
"    --date-order\n"
"    --reverse\n"
"  formatting output:\n"
"    --parents\n"
"    --children\n"
"    --objects | --objects-edge\n"
"    --unpacked\n"
"    --header | --pretty\n"
"    --abbrev=<n> | --no-abbrev\n"
"    --abbrev-commit\n"
"    --left-right\n"
"  special purpose:\n"
"    --bisect\n"
"    --bisect-vars\n"
"    --bisect-all"
;

static void finish_commit(struct commit *commit, void *data);
static void show_commit(struct commit *commit, void *data)
{
	struct rev_list_info *info = data;
	struct rev_info *revs = info->revs;

	graph_show_commit(revs->graph);

	if (revs->count) {
		if (commit->object.flags & PATCHSAME)
			revs->count_same++;
		else if (commit->object.flags & SYMMETRIC_LEFT)
			revs->count_left++;
		else
			revs->count_right++;
		finish_commit(commit, data);
		return;
	}

	if (info->show_timestamp)
		printf("%lu ", commit->date);
	if (info->header_prefix)
		fputs(info->header_prefix, stdout);

	if (!revs->graph)
		fputs(get_revision_mark(revs, commit), stdout);
	if (revs->abbrev_commit && revs->abbrev)
		fputs(find_unique_abbrev(commit->object.sha1, revs->abbrev),
		      stdout);
	else
		fputs(sha1_to_hex(commit->object.sha1), stdout);
	if (revs->print_parents) {
		struct commit_list *parents = commit->parents;
		while (parents) {
			printf(" %s", sha1_to_hex(parents->item->object.sha1));
			parents = parents->next;
		}
	}
	if (revs->children.name) {
		struct commit_list *children;

		children = lookup_decoration(&revs->children, &commit->object);
		while (children) {
			printf(" %s", sha1_to_hex(children->item->object.sha1));
			children = children->next;
		}
	}
	show_decorations(revs, commit);
	if (revs->commit_format == CMIT_FMT_ONELINE)
		putchar(' ');
	else
		putchar('\n');

	if (revs->verbose_header && commit->buffer) {
		struct strbuf buf = STRBUF_INIT;
		struct pretty_print_context ctx = {0};
		ctx.abbrev = revs->abbrev;
		ctx.date_mode = revs->date_mode;
		ctx.fmt = revs->commit_format;
		pretty_print_commit(&ctx, commit, &buf);
		if (revs->graph) {
			if (buf.len) {
				if (revs->commit_format != CMIT_FMT_ONELINE)
					graph_show_oneline(revs->graph);

				graph_show_commit_msg(revs->graph, &buf);

				/*
				 * Add a newline after the commit message.
				 *
				 * Usually, this newline produces a blank
				 * padding line between entries, in which case
				 * we need to add graph padding on this line.
				 *
				 * However, the commit message may not end in a
				 * newline.  In this case the newline simply
				 * ends the last line of the commit message,
				 * and we don't need any graph output.  (This
				 * always happens with CMIT_FMT_ONELINE, and it
				 * happens with CMIT_FMT_USERFORMAT when the
				 * format doesn't explicitly end in a newline.)
				 */
				if (buf.len && buf.buf[buf.len - 1] == '\n')
					graph_show_padding(revs->graph);
				putchar('\n');
			} else {
				/*
				 * If the message buffer is empty, just show
				 * the rest of the graph output for this
				 * commit.
				 */
				if (graph_show_remainder(revs->graph))
					putchar('\n');
				if (revs->commit_format == CMIT_FMT_ONELINE)
					putchar('\n');
			}
		} else {
			if (revs->commit_format != CMIT_FMT_USERFORMAT ||
			    buf.len) {
				fwrite(buf.buf, 1, buf.len, stdout);
				putchar(info->hdr_termination);
			}
		}
		strbuf_release(&buf);
	} else {
		if (graph_show_remainder(revs->graph))
			putchar('\n');
	}
	maybe_flush_or_die(stdout, "stdout");
	finish_commit(commit, data);
}

static void finish_commit(struct commit *commit, void *data)
{
	if (commit->parents) {
		free_commit_list(commit->parents);
		commit->parents = NULL;
	}
	free(commit->buffer);
	commit->buffer = NULL;
}

static void finish_object(struct object *obj,
			  const struct name_path *path, const char *name,
			  void *cb_data)
{
	if (obj->type == OBJ_BLOB && !has_sha1_file(obj->sha1))
		die("missing blob object '%s'", sha1_to_hex(obj->sha1));
}

static void show_object(struct object *obj,
			const struct name_path *path, const char *component,
			void *cb_data)
{
	struct rev_info *info = cb_data;

	finish_object(obj, path, component, cb_data);
	if (info->verify_objects && !obj->parsed && obj->type != OBJ_COMMIT)
		parse_object(obj->sha1);
	show_object_with_name(stdout, obj, path, component);
}

static void show_edge(struct commit *commit)
{
	printf("-%s\n", sha1_to_hex(commit->object.sha1));
}

static inline int log2i(int n)
{
	int log2 = 0;

	for (; n > 1; n >>= 1)
		log2++;

	return log2;
}

static inline int exp2i(int n)
{
	return 1 << n;
}

/*
 * Estimate the number of bisect steps left (after the current step)
 *
 * For any x between 0 included and 2^n excluded, the probability for
 * n - 1 steps left looks like:
 *
 * P(2^n + x) == (2^n - x) / (2^n + x)
 *
 * and P(2^n + x) < 0.5 means 2^n < 3x
 */
int estimate_bisect_steps(int all)
{
	int n, x, e;

	if (all < 3)
		return 0;

	n = log2i(all);
	e = exp2i(n);
	x = all - e;

	return (e < 3 * x) ? n : n - 1;
}

void print_commit_list(struct commit_list *list,
		       const char *format_cur,
		       const char *format_last)
{
	for ( ; list; list = list->next) {
		const char *format = list->next ? format_cur : format_last;
		printf(format, sha1_to_hex(list->item->object.sha1));
	}
}

static void show_tried_revs(struct commit_list *tried)
{
	printf("bisect_tried='");
	print_commit_list(tried, "%s|", "%s");
	printf("'\n");
}

static void print_var_str(const char *var, const char *val)
{
	printf("%s='%s'\n", var, val);
}

static void print_var_int(const char *var, int val)
{
	printf("%s=%d\n", var, val);
}

static int show_bisect_vars(struct rev_list_info *info, int reaches, int all)
{
	int cnt, flags = info->bisect_show_flags;
	char hex[41] = "";
	struct commit_list *tried;
	struct rev_info *revs = info->revs;

	if (!revs->commits && !(flags & BISECT_SHOW_TRIED))
		return 1;

	revs->commits = filter_skipped(revs->commits, &tried,
				       flags & BISECT_SHOW_ALL,
				       NULL, NULL);

	/*
	 * revs->commits can reach "reaches" commits among
	 * "all" commits.  If it is good, then there are
	 * (all-reaches) commits left to be bisected.
	 * On the other hand, if it is bad, then the set
	 * to bisect is "reaches".
	 * A bisect set of size N has (N-1) commits further
	 * to test, as we already know one bad one.
	 */
	cnt = all - reaches;
	if (cnt < reaches)
		cnt = reaches;

	if (revs->commits)
		strcpy(hex, sha1_to_hex(revs->commits->item->object.sha1));

	if (flags & BISECT_SHOW_ALL) {
		traverse_commit_list(revs, show_commit, show_object, info);
		printf("------\n");
	}

	if (flags & BISECT_SHOW_TRIED)
		show_tried_revs(tried);

	print_var_str("bisect_rev", hex);
	print_var_int("bisect_nr", cnt - 1);
	print_var_int("bisect_good", all - reaches - 1);
	print_var_int("bisect_bad", reaches - 1);
	print_var_int("bisect_all", all);
	print_var_int("bisect_steps", estimate_bisect_steps(all));

	return 0;
}

int cmd_rev_list(int argc, const char **argv, const char *prefix)
{
	struct rev_info revs;
	struct rev_list_info info;
	int i;
	int bisect_list = 0;
	int bisect_show_vars = 0;
	int bisect_find_all = 0;
	int quiet = 0;

	git_config(git_default_config, NULL);
	init_revisions(&revs, prefix);
	revs.abbrev = DEFAULT_ABBREV;
	revs.commit_format = CMIT_FMT_UNSPECIFIED;
	argc = setup_revisions(argc, argv, &revs, NULL);

	memset(&info, 0, sizeof(info));
	info.revs = &revs;
	if (revs.bisect)
		bisect_list = 1;

	quiet = DIFF_OPT_TST(&revs.diffopt, QUICK);
	for (i = 1 ; i < argc; i++) {
		const char *arg = argv[i];

		if (!strcmp(arg, "--header")) {
			revs.verbose_header = 1;
			continue;
		}
		if (!strcmp(arg, "--timestamp")) {
			info.show_timestamp = 1;
			continue;
		}
		if (!strcmp(arg, "--bisect")) {
			bisect_list = 1;
			continue;
		}
		if (!strcmp(arg, "--bisect-all")) {
			bisect_list = 1;
			bisect_find_all = 1;
			info.bisect_show_flags = BISECT_SHOW_ALL;
			revs.show_decorations = 1;
			continue;
		}
		if (!strcmp(arg, "--bisect-vars")) {
			bisect_list = 1;
			bisect_show_vars = 1;
			continue;
		}
		usage(rev_list_usage);

	}
	if (revs.commit_format != CMIT_FMT_UNSPECIFIED) {
		/* The command line has a --pretty  */
		info.hdr_termination = '\n';
		if (revs.commit_format == CMIT_FMT_ONELINE)
			info.header_prefix = "";
		else
			info.header_prefix = "commit ";
	}
	else if (revs.verbose_header)
		/* Only --header was specified */
		revs.commit_format = CMIT_FMT_RAW;

	if ((!revs.commits &&
	     (!(revs.tag_objects||revs.tree_objects||revs.blob_objects) &&
	      !revs.pending.nr)) ||
	    revs.diff)
		usage(rev_list_usage);

	save_commit_buffer = (revs.verbose_header ||
			      revs.grep_filter.pattern_list ||
			      revs.grep_filter.header_list);
	if (bisect_list)
		revs.limited = 1;

	if (prepare_revision_walk(&revs))
		die("revision walk setup failed");
	if (revs.tree_objects)
		mark_edges_uninteresting(revs.commits, &revs, show_edge);

	if (bisect_list) {
		int reaches = reaches, all = all;

		revs.commits = find_bisection(revs.commits, &reaches, &all,
					      bisect_find_all);

		if (bisect_show_vars)
			return show_bisect_vars(&info, reaches, all);
	}

	traverse_commit_list(&revs,
			     quiet ? finish_commit : show_commit,
			     quiet ? finish_object : show_object,
			     &info);

	if (revs.count) {
		if (revs.left_right && revs.cherry_mark)
			printf("%d\t%d\t%d\n", revs.count_left, revs.count_right, revs.count_same);
		else if (revs.left_right)
			printf("%d\t%d\n", revs.count_left, revs.count_right);
		else if (revs.cherry_mark)
			printf("%d\t%d\n", revs.count_left + revs.count_right, revs.count_same);
		else
			printf("%d\n", revs.count_left + revs.count_right);
	}

	return 0;
}