{{ message }}
Repository navigation
Expand file tree
/
Copy pathlog.c
More file actions
479 lines (398 loc) · 12.8 KB
/
Copy pathlog.c
File metadata and controls
479 lines (398 loc) · 12.8 KB
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
/*
* libgit2 "log" example - shows how to walk history and get commit info
*
* Written by the libgit2 contributors
*
* To the extent possible under law, the author(s) have dedicated all copyright
* and related and neighboring rights to this software to the public domain
* worldwide. This software is distributed without any warranty.
*
* You should have received a copy of the CC0 Public Domain Dedication along
* with this software. If not, see
* <http://creativecommons.org/publicdomain/zero/1.0/>.
*/
#include "common.h"
/**
* This example demonstrates the libgit2 rev walker APIs to roughly
* simulate the output of `git log` and a few of command line arguments.
* `git log` has many many options and this only shows a few of them.
*
* This does not have:
*
* - Robust error handling
* - Colorized or paginated output formatting
* - Most of the `git log` options
*
* This does have:
*
* - Examples of translating command line arguments to equivalent libgit2
* revwalker configuration calls
* - Simplified options to apply pathspec limits and to show basic diffs
*/
/** log_state represents walker being configured while handling options */
struct log_state {
git_repository *repo;
const char *repodir;
git_revwalk *walker;
int hide;
int sorting;
int revisions;
};
/** utility functions that are called to configure the walker */
static void set_sorting(struct log_state *s, unsigned int sort_mode);
static void push_rev(struct log_state *s, git_object *obj, int hide);
static int add_revision(struct log_state *s, const char *revstr);
/** log_options holds other command line options that affect log output */
struct log_options {
int show_diff;
int skip, limit;
int min_parents, max_parents;
git_time_t before;
git_time_t after;
const char *author;
const char *committer;
const char *grep;
};
/** utility functions that parse options and help with log output */
static int parse_options(
struct log_state *s, struct log_options *opt, int argc, char **argv);
static void print_time(const git_time *intime, const char *prefix);
static void print_commit(git_commit *commit);
static int match_with_parent(git_commit *commit, int i, git_diff_options *);
/** utility functions for filtering */
static int signature_matches(const git_signature *sig, const char *filter);
static int log_message_matches(const git_commit *commit, const char *filter);
int main(int argc, char *argv[])
{
int i, count = 0, printed = 0, parents, last_arg;
struct log_state s;
struct log_options opt;
git_diff_options diffopts = GIT_DIFF_OPTIONS_INIT;
git_oid oid;
git_commit *commit = NULL;
git_pathspec *ps = NULL;
git_libgit2_init();
/** Parse arguments and set up revwalker. */
last_arg = parse_options(&s, &opt, argc, argv);
diffopts.pathspec.strings = &argv[last_arg];
diffopts.pathspec.count = argc - last_arg;
if (diffopts.pathspec.count > 0)
check_lg2(git_pathspec_new(&ps, &diffopts.pathspec),
"Building pathspec", NULL);
if (!s.revisions)
add_revision(&s, NULL);
/** Use the revwalker to traverse the history. */
printed = count = 0;
for (; !git_revwalk_next(&oid, s.walker); git_commit_free(commit)) {
check_lg2(git_commit_lookup(&commit, s.repo, &oid),
"Failed to look up commit", NULL);
parents = (int)git_commit_parentcount(commit);
if (parents < opt.min_parents)
continue;
if (opt.max_parents > 0 && parents > opt.max_parents)
continue;
if (diffopts.pathspec.count > 0) {
int unmatched = parents;
if (parents == 0) {
git_tree *tree;
check_lg2(git_commit_tree(&tree, commit), "Get tree", NULL);
if (git_pathspec_match_tree(
NULL, tree, GIT_PATHSPEC_NO_MATCH_ERROR, ps) != 0)
unmatched = 1;
git_tree_free(tree);
} else if (parents == 1) {
unmatched = match_with_parent(commit, 0, &diffopts) ? 0 : 1;
} else {
for (i = 0; i < parents; ++i) {
if (match_with_parent(commit, i, &diffopts))
unmatched--;
}
}
if (unmatched > 0)
continue;
}
if (!signature_matches(git_commit_author(commit), opt.author))
continue;
if (!signature_matches(git_commit_committer(commit), opt.committer))
continue;
if (!log_message_matches(commit, opt.grep))
continue;
if (count++ < opt.skip)
continue;
if (opt.limit != -1 && printed++ >= opt.limit) {
git_commit_free(commit);
break;
}
print_commit(commit);
if (opt.show_diff) {
git_tree *a = NULL, *b = NULL;
git_diff *diff = NULL;
if (parents > 1)
continue;
check_lg2(git_commit_tree(&b, commit), "Get tree", NULL);
if (parents == 1) {
git_commit *parent;
check_lg2(git_commit_parent(&parent, commit, 0), "Get parent", NULL);
check_lg2(git_commit_tree(&a, parent), "Tree for parent", NULL);
git_commit_free(parent);
}
check_lg2(git_diff_tree_to_tree(
&diff, git_commit_owner(commit), a, b, &diffopts),
"Diff commit with parent", NULL);
check_lg2(
git_diff_print(diff, GIT_DIFF_FORMAT_PATCH, diff_output, NULL),
"Displaying diff", NULL);
git_diff_free(diff);
git_tree_free(a);
git_tree_free(b);
}
}
git_pathspec_free(ps);
git_revwalk_free(s.walker);
git_repository_free(s.repo);
git_libgit2_shutdown();
return 0;
}
/** Determine if the given git_signature does not contain the filter text. */
static int signature_matches(const git_signature *sig, const char *filter) {
if (filter == NULL)
return 1;
if (sig != NULL &&
(strstr(sig->name, filter) != NULL ||
strstr(sig->email, filter) != NULL))
return 1;
return 0;
}
static int log_message_matches(const git_commit *commit, const char *filter) {
const char *message = NULL;
if (filter == NULL)
return 1;
if ((message = git_commit_message(commit)) != NULL &&
strstr(message, filter) != NULL)
return 1;
return 0;
}
/** Push object (for hide or show) onto revwalker. */
static void push_rev(struct log_state *s, git_object *obj, int hide)
{
hide = s->hide ^ hide;
/** Create revwalker on demand if it doesn't already exist. */
if (!s->walker) {
check_lg2(git_revwalk_new(&s->walker, s->repo),
"Could not create revision walker", NULL);
git_revwalk_sorting(s->walker, s->sorting);
}
if (!obj)
check_lg2(git_revwalk_push_head(s->walker),
"Could not find repository HEAD", NULL);
else if (hide)
check_lg2(git_revwalk_hide(s->walker, git_object_id(obj)),
"Reference does not refer to a commit", NULL);
else
check_lg2(git_revwalk_push(s->walker, git_object_id(obj)),
"Reference does not refer to a commit", NULL);
git_object_free(obj);
}
/** Parse revision string and add revs to walker. */
static int add_revision(struct log_state *s, const char *revstr)
{
git_revspec revs;
int hide = 0;
/** Open repo on demand if it isn't already open. */
if (!s->repo) {
if (!s->repodir) s->repodir = ".";
check_lg2(git_repository_open_ext(&s->repo, s->repodir, 0, NULL),
"Could not open repository", s->repodir);
}
if (!revstr) {
push_rev(s, NULL, hide);
return 0;
}
if (*revstr == '^') {
revs.flags = GIT_REVPARSE_SINGLE;
hide = !hide;
if (git_revparse_single(&revs.from, s->repo, revstr + 1) < 0)
return -1;
} else if (git_revparse(&revs, s->repo, revstr) < 0)
return -1;
if ((revs.flags & GIT_REVPARSE_SINGLE) != 0)
push_rev(s, revs.from, hide);
else {
push_rev(s, revs.to, hide);
if ((revs.flags & GIT_REVPARSE_MERGE_BASE) != 0) {
git_oid base;
check_lg2(git_merge_base(&base, s->repo,
git_object_id(revs.from), git_object_id(revs.to)),
"Could not find merge base", revstr);
check_lg2(
git_object_lookup(&revs.to, s->repo, &base, GIT_OBJ_COMMIT),
"Could not find merge base commit", NULL);
push_rev(s, revs.to, hide);
}
push_rev(s, revs.from, !hide);
}
return 0;
}
/** Update revwalker with sorting mode. */
static void set_sorting(struct log_state *s, unsigned int sort_mode)
{
/** Open repo on demand if it isn't already open. */
if (!s->repo) {
if (!s->repodir) s->repodir = ".";
check_lg2(git_repository_open_ext(&s->repo, s->repodir, 0, NULL),
"Could not open repository", s->repodir);
}
/** Create revwalker on demand if it doesn't already exist. */
if (!s->walker)
check_lg2(git_revwalk_new(&s->walker, s->repo),
"Could not create revision walker", NULL);
if (sort_mode == GIT_SORT_REVERSE)
s->sorting = s->sorting ^ GIT_SORT_REVERSE;
else
s->sorting = sort_mode | (s->sorting & GIT_SORT_REVERSE);
git_revwalk_sorting(s->walker, s->sorting);
}
/** Helper to format a git_time value like Git. */
static void print_time(const git_time *intime, const char *prefix)
{
char sign, out[32];
struct tm *intm;
int offset, hours, minutes;
time_t t;
offset = intime->offset;
if (offset < 0) {
sign = '-';
offset = -offset;
} else {
sign = '+';
}
hours = offset / 60;
minutes = offset % 60;
t = (time_t)intime->time + (intime->offset * 60);
intm = gmtime(&t);
strftime(out, sizeof(out), "%a %b %e %T %Y", intm);
printf("%s%s %c%02d%02d\n", prefix, out, sign, hours, minutes);
}
/** Helper to print a commit object. */
static void print_commit(git_commit *commit)
{
char buf[GIT_OID_HEXSZ + 1];
int i, count;
const git_signature *sig;
const char *scan, *eol;
git_oid_tostr(buf, sizeof(buf), git_commit_id(commit));
printf("commit %s\n", buf);
if ((count = (int)git_commit_parentcount(commit)) > 1) {
printf("Merge:");
for (i = 0; i < count; ++i) {
git_oid_tostr(buf, 8, git_commit_parent_id(commit, i));
printf(" %s", buf);
}
printf("\n");
}
if ((sig = git_commit_author(commit)) != NULL) {
printf("Author: %s <%s>\n", sig->name, sig->email);
print_time(&sig->when, "Date: ");
}
printf("\n");
for (scan = git_commit_message(commit); scan && *scan; ) {
for (eol = scan; *eol && *eol != '\n'; ++eol) /* find eol */;
printf(" %.*s\n", (int)(eol - scan), scan);
scan = *eol ? eol + 1 : NULL;
}
printf("\n");
}
/** Helper to find how many files in a commit changed from its nth parent. */
static int match_with_parent(git_commit *commit, int i, git_diff_options *opts)
{
git_commit *parent;
git_tree *a, *b;
git_diff *diff;
int ndeltas;
check_lg2(
git_commit_parent(&parent, commit, (size_t)i), "Get parent", NULL);
check_lg2(git_commit_tree(&a, parent), "Tree for parent", NULL);
check_lg2(git_commit_tree(&b, commit), "Tree for commit", NULL);
check_lg2(
git_diff_tree_to_tree(&diff, git_commit_owner(commit), a, b, opts),
"Checking diff between parent and commit", NULL);
ndeltas = (int)git_diff_num_deltas(diff);
git_diff_free(diff);
git_tree_free(a);
git_tree_free(b);
git_commit_free(parent);
return ndeltas > 0;
}
/** Print a usage message for the program. */
static void usage(const char *message, const char *arg)
{
if (message && arg)
fprintf(stderr, "%s: %s\n", message, arg);
else if (message)
fprintf(stderr, "%s\n", message);
fprintf(stderr, "usage: log [<options>]\n");
exit(1);
}
/** Parse some log command line options. */
static int parse_options(
struct log_state *s, struct log_options *opt, int argc, char **argv)
{
struct args_info args = ARGS_INFO_INIT;
memset(s, 0, sizeof(*s));
s->sorting = GIT_SORT_TIME;
memset(opt, 0, sizeof(*opt));
opt->max_parents = -1;
opt->limit = -1;
for (args.pos = 1; args.pos < argc; ++args.pos) {
const char *a = argv[args.pos];
if (a[0] != '-') {
if (!add_revision(s, a))
s->revisions++;
else
/** Try failed revision parse as filename. */
break;
} else if (!strcmp(a, "--")) {
++args.pos;
break;
}
else if (!strcmp(a, "--date-order"))
set_sorting(s, GIT_SORT_TIME);
else if (!strcmp(a, "--topo-order"))
set_sorting(s, GIT_SORT_TOPOLOGICAL);
else if (!strcmp(a, "--reverse"))
set_sorting(s, GIT_SORT_REVERSE);
else if (match_str_arg(&opt->author, &args, "--author"))
/** Found valid --author */;
else if (match_str_arg(&opt->committer, &args, "--committer"))
/** Found valid --committer */;
else if (match_str_arg(&opt->grep, &args, "--grep"))
/** Found valid --grep */;
else if (match_str_arg(&s->repodir, &args, "--git-dir"))
/** Found git-dir. */;
else if (match_int_arg(&opt->skip, &args, "--skip", 0))
/** Found valid --skip. */;
else if (match_int_arg(&opt->limit, &args, "--max-count", 0))
/** Found valid --max-count. */;
else if (a[1] >= '0' && a[1] <= '9')
is_integer(&opt->limit, a + 1, 0);
else if (match_int_arg(&opt->limit, &args, "-n", 0))
/** Found valid -n. */;
else if (!strcmp(a, "--merges"))
opt->min_parents = 2;
else if (!strcmp(a, "--no-merges"))
opt->max_parents = 1;
else if (!strcmp(a, "--no-min-parents"))
opt->min_parents = 0;
else if (!strcmp(a, "--no-max-parents"))
opt->max_parents = -1;
else if (match_int_arg(&opt->max_parents, &args, "--max-parents=", 1))
/** Found valid --max-parents. */;
else if (match_int_arg(&opt->min_parents, &args, "--min-parents=", 0))
/** Found valid --min_parents. */;
else if (!strcmp(a, "-p") || !strcmp(a, "-u") || !strcmp(a, "--patch"))
opt->show_diff = 1;
else
usage("Unsupported argument", a);
}
return args.pos;
}
You can’t perform that action at this time.