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ref-filter: introduce match_atom_name()
[git.git] / ref-filter.c
blob514de3404664d041ac1222324a01fe2be9cf7a1a
1 #include "builtin.h"
2 #include "cache.h"
3 #include "parse-options.h"
4 #include "refs.h"
5 #include "wildmatch.h"
6 #include "commit.h"
7 #include "remote.h"
8 #include "color.h"
9 #include "tag.h"
10 #include "quote.h"
11 #include "ref-filter.h"
12 #include "revision.h"
13
14 typedef enum { FIELD_STR, FIELD_ULONG, FIELD_TIME } cmp_type;
15
16 static struct {
17 const char *name;
18 cmp_type cmp_type;
19 } valid_atom[] = {
20 { "refname" },
21 { "objecttype" },
22 { "objectsize", FIELD_ULONG },
23 { "objectname" },
24 { "tree" },
25 { "parent" },
26 { "numparent", FIELD_ULONG },
27 { "object" },
28 { "type" },
29 { "tag" },
30 { "author" },
31 { "authorname" },
32 { "authoremail" },
33 { "authordate", FIELD_TIME },
34 { "committer" },
35 { "committername" },
36 { "committeremail" },
37 { "committerdate", FIELD_TIME },
38 { "tagger" },
39 { "taggername" },
40 { "taggeremail" },
41 { "taggerdate", FIELD_TIME },
42 { "creator" },
43 { "creatordate", FIELD_TIME },
44 { "subject" },
45 { "body" },
46 { "contents" },
47 { "contents:subject" },
48 { "contents:body" },
49 { "contents:signature" },
50 { "upstream" },
51 { "push" },
52 { "symref" },
53 { "flag" },
54 { "HEAD" },
55 { "color" },
56 };
57
58 #define REF_FORMATTING_STATE_INIT { 0, NULL }
59
60 struct ref_formatting_stack {
61 struct ref_formatting_stack *prev;
62 struct strbuf output;
63 };
64
65 struct ref_formatting_state {
66 int quote_style;
67 struct ref_formatting_stack *stack;
68 };
69
70 struct atom_value {
71 const char *s;
72 void (*handler)(struct atom_value *atomv, struct ref_formatting_state *state);
73 unsigned long ul; /* used for sorting when not FIELD_STR */
74 };
75
76 /*
77 * An atom is a valid field atom listed above, possibly prefixed with
78 * a "*" to denote deref_tag().
79 *
80 * We parse given format string and sort specifiers, and make a list
81 * of properties that we need to extract out of objects. ref_array_item
82 * structure will hold an array of values extracted that can be
83 * indexed with the "atom number", which is an index into this
84 * array.
85 */
86 static const char **used_atom;
87 static cmp_type *used_atom_type;
88 static int used_atom_cnt, need_tagged, need_symref;
89 static int need_color_reset_at_eol;
90
91 /*
92 * Used to parse format string and sort specifiers
93 */
94 int parse_ref_filter_atom(const char *atom, const char *ep)
95 {
96 const char *sp;
97 int i, at;
98
99 sp = atom;
100 if (*sp == '*' && sp < ep)
101 sp++; /* deref */
102 if (ep <= sp)
103 die("malformed field name: %.*s", (int)(ep-atom), atom);
104
105 /* Do we have the atom already used elsewhere? */
106 for (i = 0; i < used_atom_cnt; i++) {
107 int len = strlen(used_atom[i]);
108 if (len == ep - atom && !memcmp(used_atom[i], atom, len))
109 return i;
110 }
111
112 /* Is the atom a valid one? */
113 for (i = 0; i < ARRAY_SIZE(valid_atom); i++) {
114 int len = strlen(valid_atom[i].name);
115 /*
116 * If the atom name has a colon, strip it and everything after
117 * it off - it specifies the format for this entry, and
118 * shouldn't be used for checking against the valid_atom
119 * table.
120 */
121 const char *formatp = strchr(sp, ':');
122 if (!formatp || ep < formatp)
123 formatp = ep;
124 if (len == formatp - sp && !memcmp(valid_atom[i].name, sp, len))
125 break;
126 }
127
128 if (ARRAY_SIZE(valid_atom) <= i)
129 die("unknown field name: %.*s", (int)(ep-atom), atom);
130
131 /* Add it in, including the deref prefix */
132 at = used_atom_cnt;
133 used_atom_cnt++;
134 REALLOC_ARRAY(used_atom, used_atom_cnt);
135 REALLOC_ARRAY(used_atom_type, used_atom_cnt);
136 used_atom[at] = xmemdupz(atom, ep - atom);
137 used_atom_type[at] = valid_atom[i].cmp_type;
138 if (*atom == '*')
139 need_tagged = 1;
140 if (!strcmp(used_atom[at], "symref"))
141 need_symref = 1;
142 return at;
143 }
144
145 static void quote_formatting(struct strbuf *s, const char *str, int quote_style)
146 {
147 switch (quote_style) {
148 case QUOTE_NONE:
149 strbuf_addstr(s, str);
150 break;
151 case QUOTE_SHELL:
152 sq_quote_buf(s, str);
153 break;
154 case QUOTE_PERL:
155 perl_quote_buf(s, str);
156 break;
157 case QUOTE_PYTHON:
158 python_quote_buf(s, str);
159 break;
160 case QUOTE_TCL:
161 tcl_quote_buf(s, str);
162 break;
163 }
164 }
165
166 static void append_atom(struct atom_value *v, struct ref_formatting_state *state)
167 {
168 quote_formatting(&state->stack->output, v->s, state->quote_style);
169 }
170
171 static void push_stack_element(struct ref_formatting_stack **stack)
172 {
173 struct ref_formatting_stack *s = xcalloc(1, sizeof(struct ref_formatting_stack));
174
175 strbuf_init(&s->output, 0);
176 s->prev = *stack;
177 *stack = s;
178 }
179
180 static void pop_stack_element(struct ref_formatting_stack **stack)
181 {
182 struct ref_formatting_stack *current = *stack;
183 struct ref_formatting_stack *prev = current->prev;
184
185 if (prev)
186 strbuf_addbuf(&prev->output, &current->output);
187 strbuf_release(&current->output);
188 free(current);
189 *stack = prev;
190 }
191
192 static int match_atom_name(const char *name, const char *atom_name, const char **val)
193 {
194 const char *body;
195
196 if (!skip_prefix(name, atom_name, &body))
197 return 0; /* doesn't even begin with "atom_name" */
198 if (!body[0]) {
199 *val = NULL; /* %(atom_name) and no customization */
200 return 1;
201 }
202 if (body[0] != ':')
203 return 0; /* "atom_namefoo" is not "atom_name" or "atom_name:..." */
204 *val = body + 1; /* "atom_name:val" */
205 return 1;
206 }
207
208 /*
209 * In a format string, find the next occurrence of %(atom).
210 */
211 static const char *find_next(const char *cp)
212 {
213 while (*cp) {
214 if (*cp == '%') {
215 /*
216 * %( is the start of an atom;
217 * %% is a quoted per-cent.
218 */
219 if (cp[1] == '(')
220 return cp;
221 else if (cp[1] == '%')
222 cp++; /* skip over two % */
223 /* otherwise this is a singleton, literal % */
224 }
225 cp++;
226 }
227 return NULL;
228 }
229
230 /*
231 * Make sure the format string is well formed, and parse out
232 * the used atoms.
233 */
234 int verify_ref_format(const char *format)
235 {
236 const char *cp, *sp;
237
238 need_color_reset_at_eol = 0;
239 for (cp = format; *cp && (sp = find_next(cp)); ) {
240 const char *color, *ep = strchr(sp, ')');
241 int at;
242
243 if (!ep)
244 return error("malformed format string %s", sp);
245 /* sp points at "%(" and ep points at the closing ")" */
246 at = parse_ref_filter_atom(sp + 2, ep);
247 cp = ep + 1;
248
249 if (skip_prefix(used_atom[at], "color:", &color))
250 need_color_reset_at_eol = !!strcmp(color, "reset");
251 }
252 return 0;
253 }
254
255 /*
256 * Given an object name, read the object data and size, and return a
257 * "struct object". If the object data we are returning is also borrowed
258 * by the "struct object" representation, set *eaten as well---it is a
259 * signal from parse_object_buffer to us not to free the buffer.
260 */
261 static void *get_obj(const unsigned char *sha1, struct object **obj, unsigned long *sz, int *eaten)
262 {
263 enum object_type type;
264 void *buf = read_sha1_file(sha1, &type, sz);
265
266 if (buf)
267 *obj = parse_object_buffer(sha1, type, *sz, buf, eaten);
268 else
269 *obj = NULL;
270 return buf;
271 }
272
273 static int grab_objectname(const char *name, const unsigned char *sha1,
274 struct atom_value *v)
275 {
276 if (!strcmp(name, "objectname")) {
277 char *s = xmalloc(41);
278 strcpy(s, sha1_to_hex(sha1));
279 v->s = s;
280 return 1;
281 }
282 if (!strcmp(name, "objectname:short")) {
283 v->s = xstrdup(find_unique_abbrev(sha1, DEFAULT_ABBREV));
284 return 1;
285 }
286 return 0;
287 }
288
289 /* See grab_values */
290 static void grab_common_values(struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
291 {
292 int i;
293
294 for (i = 0; i < used_atom_cnt; i++) {
295 const char *name = used_atom[i];
296 struct atom_value *v = &val[i];
297 if (!!deref != (*name == '*'))
298 continue;
299 if (deref)
300 name++;
301 if (!strcmp(name, "objecttype"))
302 v->s = typename(obj->type);
303 else if (!strcmp(name, "objectsize")) {
304 char *s = xmalloc(40);
305 sprintf(s, "%lu", sz);
306 v->ul = sz;
307 v->s = s;
308 }
309 else if (deref)
310 grab_objectname(name, obj->sha1, v);
311 }
312 }
313
314 /* See grab_values */
315 static void grab_tag_values(struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
316 {
317 int i;
318 struct tag *tag = (struct tag *) obj;
319
320 for (i = 0; i < used_atom_cnt; i++) {
321 const char *name = used_atom[i];
322 struct atom_value *v = &val[i];
323 if (!!deref != (*name == '*'))
324 continue;
325 if (deref)
326 name++;
327 if (!strcmp(name, "tag"))
328 v->s = tag->tag;
329 else if (!strcmp(name, "type") && tag->tagged)
330 v->s = typename(tag->tagged->type);
331 else if (!strcmp(name, "object") && tag->tagged) {
332 char *s = xmalloc(41);
333 strcpy(s, sha1_to_hex(tag->tagged->sha1));
334 v->s = s;
335 }
336 }
337 }
338
339 /* See grab_values */
340 static void grab_commit_values(struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
341 {
342 int i;
343 struct commit *commit = (struct commit *) obj;
344
345 for (i = 0; i < used_atom_cnt; i++) {
346 const char *name = used_atom[i];
347 struct atom_value *v = &val[i];
348 if (!!deref != (*name == '*'))
349 continue;
350 if (deref)
351 name++;
352 if (!strcmp(name, "tree")) {
353 char *s = xmalloc(41);
354 strcpy(s, sha1_to_hex(commit->tree->object.sha1));
355 v->s = s;
356 }
357 if (!strcmp(name, "numparent")) {
358 char *s = xmalloc(40);
359 v->ul = commit_list_count(commit->parents);
360 sprintf(s, "%lu", v->ul);
361 v->s = s;
362 }
363 else if (!strcmp(name, "parent")) {
364 int num = commit_list_count(commit->parents);
365 int i;
366 struct commit_list *parents;
367 char *s = xmalloc(41 * num + 1);
368 v->s = s;
369 for (i = 0, parents = commit->parents;
370 parents;
371 parents = parents->next, i = i + 41) {
372 struct commit *parent = parents->item;
373 strcpy(s+i, sha1_to_hex(parent->object.sha1));
374 if (parents->next)
375 s[i+40] = ' ';
376 }
377 if (!i)
378 *s = '\0';
379 }
380 }
381 }
382
383 static const char *find_wholine(const char *who, int wholen, const char *buf, unsigned long sz)
384 {
385 const char *eol;
386 while (*buf) {
387 if (!strncmp(buf, who, wholen) &&
388 buf[wholen] == ' ')
389 return buf + wholen + 1;
390 eol = strchr(buf, '\n');
391 if (!eol)
392 return "";
393 eol++;
394 if (*eol == '\n')
395 return ""; /* end of header */
396 buf = eol;
397 }
398 return "";
399 }
400
401 static const char *copy_line(const char *buf)
402 {
403 const char *eol = strchrnul(buf, '\n');
404 return xmemdupz(buf, eol - buf);
405 }
406
407 static const char *copy_name(const char *buf)
408 {
409 const char *cp;
410 for (cp = buf; *cp && *cp != '\n'; cp++) {
411 if (!strncmp(cp, " <", 2))
412 return xmemdupz(buf, cp - buf);
413 }
414 return "";
415 }
416
417 static const char *copy_email(const char *buf)
418 {
419 const char *email = strchr(buf, '<');
420 const char *eoemail;
421 if (!email)
422 return "";
423 eoemail = strchr(email, '>');
424 if (!eoemail)
425 return "";
426 return xmemdupz(email, eoemail + 1 - email);
427 }
428
429 static char *copy_subject(const char *buf, unsigned long len)
430 {
431 char *r = xmemdupz(buf, len);
432 int i;
433
434 for (i = 0; i < len; i++)
435 if (r[i] == '\n')
436 r[i] = ' ';
437
438 return r;
439 }
440
441 static void grab_date(const char *buf, struct atom_value *v, const char *atomname)
442 {
443 const char *eoemail = strstr(buf, "> ");
444 char *zone;
445 unsigned long timestamp;
446 long tz;
447 struct date_mode date_mode = { DATE_NORMAL };
448 const char *formatp;
449
450 /*
451 * We got here because atomname ends in "date" or "date<something>";
452 * it's not possible that <something> is not ":<format>" because
453 * parse_ref_filter_atom() wouldn't have allowed it, so we can assume that no
454 * ":" means no format is specified, and use the default.
455 */
456 formatp = strchr(atomname, ':');
457 if (formatp != NULL) {
458 formatp++;
459 parse_date_format(formatp, &date_mode);
460 }
461
462 if (!eoemail)
463 goto bad;
464 timestamp = strtoul(eoemail + 2, &zone, 10);
465 if (timestamp == ULONG_MAX)
466 goto bad;
467 tz = strtol(zone, NULL, 10);
468 if ((tz == LONG_MIN || tz == LONG_MAX) && errno == ERANGE)
469 goto bad;
470 v->s = xstrdup(show_date(timestamp, tz, &date_mode));
471 v->ul = timestamp;
472 return;
473 bad:
474 v->s = "";
475 v->ul = 0;
476 }
477
478 /* See grab_values */
479 static void grab_person(const char *who, struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
480 {
481 int i;
482 int wholen = strlen(who);
483 const char *wholine = NULL;
484
485 for (i = 0; i < used_atom_cnt; i++) {
486 const char *name = used_atom[i];
487 struct atom_value *v = &val[i];
488 if (!!deref != (*name == '*'))
489 continue;
490 if (deref)
491 name++;
492 if (strncmp(who, name, wholen))
493 continue;
494 if (name[wholen] != 0 &&
495 strcmp(name + wholen, "name") &&
496 strcmp(name + wholen, "email") &&
497 !starts_with(name + wholen, "date"))
498 continue;
499 if (!wholine)
500 wholine = find_wholine(who, wholen, buf, sz);
501 if (!wholine)
502 return; /* no point looking for it */
503 if (name[wholen] == 0)
504 v->s = copy_line(wholine);
505 else if (!strcmp(name + wholen, "name"))
506 v->s = copy_name(wholine);
507 else if (!strcmp(name + wholen, "email"))
508 v->s = copy_email(wholine);
509 else if (starts_with(name + wholen, "date"))
510 grab_date(wholine, v, name);
511 }
512
513 /*
514 * For a tag or a commit object, if "creator" or "creatordate" is
515 * requested, do something special.
516 */
517 if (strcmp(who, "tagger") && strcmp(who, "committer"))
518 return; /* "author" for commit object is not wanted */
519 if (!wholine)
520 wholine = find_wholine(who, wholen, buf, sz);
521 if (!wholine)
522 return;
523 for (i = 0; i < used_atom_cnt; i++) {
524 const char *name = used_atom[i];
525 struct atom_value *v = &val[i];
526 if (!!deref != (*name == '*'))
527 continue;
528 if (deref)
529 name++;
530
531 if (starts_with(name, "creatordate"))
532 grab_date(wholine, v, name);
533 else if (!strcmp(name, "creator"))
534 v->s = copy_line(wholine);
535 }
536 }
537
538 static void find_subpos(const char *buf, unsigned long sz,
539 const char **sub, unsigned long *sublen,
540 const char **body, unsigned long *bodylen,
541 unsigned long *nonsiglen,
542 const char **sig, unsigned long *siglen)
543 {
544 const char *eol;
545 /* skip past header until we hit empty line */
546 while (*buf && *buf != '\n') {
547 eol = strchrnul(buf, '\n');
548 if (*eol)
549 eol++;
550 buf = eol;
551 }
552 /* skip any empty lines */
553 while (*buf == '\n')
554 buf++;
555
556 /* parse signature first; we might not even have a subject line */
557 *sig = buf + parse_signature(buf, strlen(buf));
558 *siglen = strlen(*sig);
559
560 /* subject is first non-empty line */
561 *sub = buf;
562 /* subject goes to first empty line */
563 while (buf < *sig && *buf && *buf != '\n') {
564 eol = strchrnul(buf, '\n');
565 if (*eol)
566 eol++;
567 buf = eol;
568 }
569 *sublen = buf - *sub;
570 /* drop trailing newline, if present */
571 if (*sublen && (*sub)[*sublen - 1] == '\n')
572 *sublen -= 1;
573
574 /* skip any empty lines */
575 while (*buf == '\n')
576 buf++;
577 *body = buf;
578 *bodylen = strlen(buf);
579 *nonsiglen = *sig - buf;
580 }
581
582 /* See grab_values */
583 static void grab_sub_body_contents(struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
584 {
585 int i;
586 const char *subpos = NULL, *bodypos = NULL, *sigpos = NULL;
587 unsigned long sublen = 0, bodylen = 0, nonsiglen = 0, siglen = 0;
588
589 for (i = 0; i < used_atom_cnt; i++) {
590 const char *name = used_atom[i];
591 struct atom_value *v = &val[i];
592 if (!!deref != (*name == '*'))
593 continue;
594 if (deref)
595 name++;
596 if (strcmp(name, "subject") &&
597 strcmp(name, "body") &&
598 strcmp(name, "contents") &&
599 strcmp(name, "contents:subject") &&
600 strcmp(name, "contents:body") &&
601 strcmp(name, "contents:signature"))
602 continue;
603 if (!subpos)
604 find_subpos(buf, sz,
605 &subpos, &sublen,
606 &bodypos, &bodylen, &nonsiglen,
607 &sigpos, &siglen);
608
609 if (!strcmp(name, "subject"))
610 v->s = copy_subject(subpos, sublen);
611 else if (!strcmp(name, "contents:subject"))
612 v->s = copy_subject(subpos, sublen);
613 else if (!strcmp(name, "body"))
614 v->s = xmemdupz(bodypos, bodylen);
615 else if (!strcmp(name, "contents:body"))
616 v->s = xmemdupz(bodypos, nonsiglen);
617 else if (!strcmp(name, "contents:signature"))
618 v->s = xmemdupz(sigpos, siglen);
619 else if (!strcmp(name, "contents"))
620 v->s = xstrdup(subpos);
621 }
622 }
623
624 /*
625 * We want to have empty print-string for field requests
626 * that do not apply (e.g. "authordate" for a tag object)
627 */
628 static void fill_missing_values(struct atom_value *val)
629 {
630 int i;
631 for (i = 0; i < used_atom_cnt; i++) {
632 struct atom_value *v = &val[i];
633 if (v->s == NULL)
634 v->s = "";
635 }
636 }
637
638 /*
639 * val is a list of atom_value to hold returned values. Extract
640 * the values for atoms in used_atom array out of (obj, buf, sz).
641 * when deref is false, (obj, buf, sz) is the object that is
642 * pointed at by the ref itself; otherwise it is the object the
643 * ref (which is a tag) refers to.
644 */
645 static void grab_values(struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
646 {
647 grab_common_values(val, deref, obj, buf, sz);
648 switch (obj->type) {
649 case OBJ_TAG:
650 grab_tag_values(val, deref, obj, buf, sz);
651 grab_sub_body_contents(val, deref, obj, buf, sz);
652 grab_person("tagger", val, deref, obj, buf, sz);
653 break;
654 case OBJ_COMMIT:
655 grab_commit_values(val, deref, obj, buf, sz);
656 grab_sub_body_contents(val, deref, obj, buf, sz);
657 grab_person("author", val, deref, obj, buf, sz);
658 grab_person("committer", val, deref, obj, buf, sz);
659 break;
660 case OBJ_TREE:
661 /* grab_tree_values(val, deref, obj, buf, sz); */
662 break;
663 case OBJ_BLOB:
664 /* grab_blob_values(val, deref, obj, buf, sz); */
665 break;
666 default:
667 die("Eh? Object of type %d?", obj->type);
668 }
669 }
670
671 static inline char *copy_advance(char *dst, const char *src)
672 {
673 while (*src)
674 *dst++ = *src++;
675 return dst;
676 }
677
678 /*
679 * Parse the object referred by ref, and grab needed value.
680 */
681 static void populate_value(struct ref_array_item *ref)
682 {
683 void *buf;
684 struct object *obj;
685 int eaten, i;
686 unsigned long size;
687 const unsigned char *tagged;
688
689 ref->value = xcalloc(used_atom_cnt, sizeof(struct atom_value));
690
691 if (need_symref && (ref->flag & REF_ISSYMREF) && !ref->symref) {
692 unsigned char unused1[20];
693 ref->symref = resolve_refdup(ref->refname, RESOLVE_REF_READING,
694 unused1, NULL);
695 if (!ref->symref)
696 ref->symref = "";
697 }
698
699 /* Fill in specials first */
700 for (i = 0; i < used_atom_cnt; i++) {
701 const char *name = used_atom[i];
702 struct atom_value *v = &ref->value[i];
703 int deref = 0;
704 const char *refname;
705 const char *formatp;
706 const char *valp;
707 struct branch *branch = NULL;
708
709 v->handler = append_atom;
710
711 if (*name == '*') {
712 deref = 1;
713 name++;
714 }
715
716 if (starts_with(name, "refname"))
717 refname = ref->refname;
718 else if (starts_with(name, "symref"))
719 refname = ref->symref ? ref->symref : "";
720 else if (starts_with(name, "upstream")) {
721 const char *branch_name;
722 /* only local branches may have an upstream */
723 if (!skip_prefix(ref->refname, "refs/heads/",
724 &branch_name))
725 continue;
726 branch = branch_get(branch_name);
727
728 refname = branch_get_upstream(branch, NULL);
729 if (!refname)
730 continue;
731 } else if (starts_with(name, "push")) {
732 const char *branch_name;
733 if (!skip_prefix(ref->refname, "refs/heads/",
734 &branch_name))
735 continue;
736 branch = branch_get(branch_name);
737
738 refname = branch_get_push(branch, NULL);
739 if (!refname)
740 continue;
741 } else if (match_atom_name(name, "color", &valp)) {
742 char color[COLOR_MAXLEN] = "";
743
744 if (!valp)
745 die(_("expected format: %%(color:<color>)"));
746 if (color_parse(valp, color) < 0)
747 die(_("unable to parse format"));
748 v->s = xstrdup(color);
749 continue;
750 } else if (!strcmp(name, "flag")) {
751 char buf[256], *cp = buf;
752 if (ref->flag & REF_ISSYMREF)
753 cp = copy_advance(cp, ",symref");
754 if (ref->flag & REF_ISPACKED)
755 cp = copy_advance(cp, ",packed");
756 if (cp == buf)
757 v->s = "";
758 else {
759 *cp = '\0';
760 v->s = xstrdup(buf + 1);
761 }
762 continue;
763 } else if (!deref && grab_objectname(name, ref->objectname, v)) {
764 continue;
765 } else if (!strcmp(name, "HEAD")) {
766 const char *head;
767 unsigned char sha1[20];
768
769 head = resolve_ref_unsafe("HEAD", RESOLVE_REF_READING,
770 sha1, NULL);
771 if (!strcmp(ref->refname, head))
772 v->s = "*";
773 else
774 v->s = " ";
775 continue;
776 } else
777 continue;
778
779 formatp = strchr(name, ':');
780 if (formatp) {
781 int num_ours, num_theirs;
782
783 formatp++;
784 if (!strcmp(formatp, "short"))
785 refname = shorten_unambiguous_ref(refname,
786 warn_ambiguous_refs);
787 else if (!strcmp(formatp, "track") &&
788 (starts_with(name, "upstream") ||
789 starts_with(name, "push"))) {
790 char buf[40];
791
792 if (stat_tracking_info(branch, &num_ours,
793 &num_theirs, NULL))
794 continue;
795
796 if (!num_ours && !num_theirs)
797 v->s = "";
798 else if (!num_ours) {
799 sprintf(buf, "[behind %d]", num_theirs);
800 v->s = xstrdup(buf);
801 } else if (!num_theirs) {
802 sprintf(buf, "[ahead %d]", num_ours);
803 v->s = xstrdup(buf);
804 } else {
805 sprintf(buf, "[ahead %d, behind %d]",
806 num_ours, num_theirs);
807 v->s = xstrdup(buf);
808 }
809 continue;
810 } else if (!strcmp(formatp, "trackshort") &&
811 (starts_with(name, "upstream") ||
812 starts_with(name, "push"))) {
813 assert(branch);
814
815 if (stat_tracking_info(branch, &num_ours,
816 &num_theirs, NULL))
817 continue;
818
819 if (!num_ours && !num_theirs)
820 v->s = "=";
821 else if (!num_ours)
822 v->s = "<";
823 else if (!num_theirs)
824 v->s = ">";
825 else
826 v->s = "<>";
827 continue;
828 } else
829 die("unknown %.*s format %s",
830 (int)(formatp - name), name, formatp);
831 }
832
833 if (!deref)
834 v->s = refname;
835 else {
836 int len = strlen(refname);
837 char *s = xmalloc(len + 4);
838 sprintf(s, "%s^{}", refname);
839 v->s = s;
840 }
841 }
842
843 for (i = 0; i < used_atom_cnt; i++) {
844 struct atom_value *v = &ref->value[i];
845 if (v->s == NULL)
846 goto need_obj;
847 }
848 return;
849
850 need_obj:
851 buf = get_obj(ref->objectname, &obj, &size, &eaten);
852 if (!buf)
853 die("missing object %s for %s",
854 sha1_to_hex(ref->objectname), ref->refname);
855 if (!obj)
856 die("parse_object_buffer failed on %s for %s",
857 sha1_to_hex(ref->objectname), ref->refname);
858
859 grab_values(ref->value, 0, obj, buf, size);
860 if (!eaten)
861 free(buf);
862
863 /*
864 * If there is no atom that wants to know about tagged
865 * object, we are done.
866 */
867 if (!need_tagged || (obj->type != OBJ_TAG))
868 return;
869
870 /*
871 * If it is a tag object, see if we use a value that derefs
872 * the object, and if we do grab the object it refers to.
873 */
874 tagged = ((struct tag *)obj)->tagged->sha1;
875
876 /*
877 * NEEDSWORK: This derefs tag only once, which
878 * is good to deal with chains of trust, but
879 * is not consistent with what deref_tag() does
880 * which peels the onion to the core.
881 */
882 buf = get_obj(tagged, &obj, &size, &eaten);
883 if (!buf)
884 die("missing object %s for %s",
885 sha1_to_hex(tagged), ref->refname);
886 if (!obj)
887 die("parse_object_buffer failed on %s for %s",
888 sha1_to_hex(tagged), ref->refname);
889 grab_values(ref->value, 1, obj, buf, size);
890 if (!eaten)
891 free(buf);
892 }
893
894 /*
895 * Given a ref, return the value for the atom. This lazily gets value
896 * out of the object by calling populate value.
897 */
898 static void get_ref_atom_value(struct ref_array_item *ref, int atom, struct atom_value **v)
899 {
900 if (!ref->value) {
901 populate_value(ref);
902 fill_missing_values(ref->value);
903 }
904 *v = &ref->value[atom];
905 }
906
907 enum contains_result {
908 CONTAINS_UNKNOWN = -1,
909 CONTAINS_NO = 0,
910 CONTAINS_YES = 1
911 };
912
913 /*
914 * Mimicking the real stack, this stack lives on the heap, avoiding stack
915 * overflows.
916 *
917 * At each recursion step, the stack items points to the commits whose
918 * ancestors are to be inspected.
919 */
920 struct contains_stack {
921 int nr, alloc;
922 struct contains_stack_entry {
923 struct commit *commit;
924 struct commit_list *parents;
925 } *contains_stack;
926 };
927
928 static int in_commit_list(const struct commit_list *want, struct commit *c)
929 {
930 for (; want; want = want->next)
931 if (!hashcmp(want->item->object.sha1, c->object.sha1))
932 return 1;
933 return 0;
934 }
935
936 /*
937 * Test whether the candidate or one of its parents is contained in the list.
938 * Do not recurse to find out, though, but return -1 if inconclusive.
939 */
940 static enum contains_result contains_test(struct commit *candidate,
941 const struct commit_list *want)
942 {
943 /* was it previously marked as containing a want commit? */
944 if (candidate->object.flags & TMP_MARK)
945 return 1;
946 /* or marked as not possibly containing a want commit? */
947 if (candidate->object.flags & UNINTERESTING)
948 return 0;
949 /* or are we it? */
950 if (in_commit_list(want, candidate)) {
951 candidate->object.flags |= TMP_MARK;
952 return 1;
953 }
954
955 if (parse_commit(candidate) < 0)
956 return 0;
957
958 return -1;
959 }
960
961 static void push_to_contains_stack(struct commit *candidate, struct contains_stack *contains_stack)
962 {
963 ALLOC_GROW(contains_stack->contains_stack, contains_stack->nr + 1, contains_stack->alloc);
964 contains_stack->contains_stack[contains_stack->nr].commit = candidate;
965 contains_stack->contains_stack[contains_stack->nr++].parents = candidate->parents;
966 }
967
968 static enum contains_result contains_tag_algo(struct commit *candidate,
969 const struct commit_list *want)
970 {
971 struct contains_stack contains_stack = { 0, 0, NULL };
972 int result = contains_test(candidate, want);
973
974 if (result != CONTAINS_UNKNOWN)
975 return result;
976
977 push_to_contains_stack(candidate, &contains_stack);
978 while (contains_stack.nr) {
979 struct contains_stack_entry *entry = &contains_stack.contains_stack[contains_stack.nr - 1];
980 struct commit *commit = entry->commit;
981 struct commit_list *parents = entry->parents;
982
983 if (!parents) {
984 commit->object.flags |= UNINTERESTING;
985 contains_stack.nr--;
986 }
987 /*
988 * If we just popped the stack, parents->item has been marked,
989 * therefore contains_test will return a meaningful 0 or 1.
990 */
991 else switch (contains_test(parents->item, want)) {
992 case CONTAINS_YES:
993 commit->object.flags |= TMP_MARK;
994 contains_stack.nr--;
995 break;
996 case CONTAINS_NO:
997 entry->parents = parents->next;
998 break;
999 case CONTAINS_UNKNOWN:
1000 push_to_contains_stack(parents->item, &contains_stack);
1001 break;
1002 }
1003 }
1004 free(contains_stack.contains_stack);
1005 return contains_test(candidate, want);
1006 }
1007
1008 static int commit_contains(struct ref_filter *filter, struct commit *commit)
1009 {
1010 if (filter->with_commit_tag_algo)
1011 return contains_tag_algo(commit, filter->with_commit);
1012 return is_descendant_of(commit, filter->with_commit);
1013 }
1014
1015 /*
1016 * Return 1 if the refname matches one of the patterns, otherwise 0.
1017 * A pattern can be path prefix (e.g. a refname "refs/heads/master"
1018 * matches a pattern "refs/heads/") or a wildcard (e.g. the same ref
1019 * matches "refs/heads/m*",too).
1020 */
1021 static int match_name_as_path(const char **pattern, const char *refname)
1022 {
1023 int namelen = strlen(refname);
1024 for (; *pattern; pattern++) {
1025 const char *p = *pattern;
1026 int plen = strlen(p);
1027
1028 if ((plen <= namelen) &&
1029 !strncmp(refname, p, plen) &&
1030 (refname[plen] == '\0' ||
1031 refname[plen] == '/' ||
1032 p[plen-1] == '/'))
1033 return 1;
1034 if (!wildmatch(p, refname, WM_PATHNAME, NULL))
1035 return 1;
1036 }
1037 return 0;
1038 }
1039
1040 /*
1041 * Given a ref (sha1, refname), check if the ref belongs to the array
1042 * of sha1s. If the given ref is a tag, check if the given tag points
1043 * at one of the sha1s in the given sha1 array.
1044 * the given sha1_array.
1045 * NEEDSWORK:
1046 * 1. Only a single level of inderection is obtained, we might want to
1047 * change this to account for multiple levels (e.g. annotated tags
1048 * pointing to annotated tags pointing to a commit.)
1049 * 2. As the refs are cached we might know what refname peels to without
1050 * the need to parse the object via parse_object(). peel_ref() might be a
1051 * more efficient alternative to obtain the pointee.
1052 */
1053 static const unsigned char *match_points_at(struct sha1_array *points_at,
1054 const unsigned char *sha1,
1055 const char *refname)
1056 {
1057 const unsigned char *tagged_sha1 = NULL;
1058 struct object *obj;
1059
1060 if (sha1_array_lookup(points_at, sha1) >= 0)
1061 return sha1;
1062 obj = parse_object(sha1);
1063 if (!obj)
1064 die(_("malformed object at '%s'"), refname);
1065 if (obj->type == OBJ_TAG)
1066 tagged_sha1 = ((struct tag *)obj)->tagged->sha1;
1067 if (tagged_sha1 && sha1_array_lookup(points_at, tagged_sha1) >= 0)
1068 return tagged_sha1;
1069 return NULL;
1070 }
1071
1072 /* Allocate space for a new ref_array_item and copy the objectname and flag to it */
1073 static struct ref_array_item *new_ref_array_item(const char *refname,
1074 const unsigned char *objectname,
1075 int flag)
1076 {
1077 size_t len = strlen(refname);
1078 struct ref_array_item *ref = xcalloc(1, sizeof(struct ref_array_item) + len + 1);
1079 memcpy(ref->refname, refname, len);
1080 ref->refname[len] = '\0';
1081 hashcpy(ref->objectname, objectname);
1082 ref->flag = flag;
1083
1084 return ref;
1085 }
1086
1087 /*
1088 * A call-back given to for_each_ref(). Filter refs and keep them for
1089 * later object processing.
1090 */
1091 static int ref_filter_handler(const char *refname, const struct object_id *oid, int flag, void *cb_data)
1092 {
1093 struct ref_filter_cbdata *ref_cbdata = cb_data;
1094 struct ref_filter *filter = ref_cbdata->filter;
1095 struct ref_array_item *ref;
1096 struct commit *commit = NULL;
1097
1098 if (flag & REF_BAD_NAME) {
1099 warning("ignoring ref with broken name %s", refname);
1100 return 0;
1101 }
1102
1103 if (flag & REF_ISBROKEN) {
1104 warning("ignoring broken ref %s", refname);
1105 return 0;
1106 }
1107
1108 if (*filter->name_patterns && !match_name_as_path(filter->name_patterns, refname))
1109 return 0;
1110
1111 if (filter->points_at.nr && !match_points_at(&filter->points_at, oid->hash, refname))
1112 return 0;
1113
1114 /*
1115 * A merge filter is applied on refs pointing to commits. Hence
1116 * obtain the commit using the 'oid' available and discard all
1117 * non-commits early. The actual filtering is done later.
1118 */
1119 if (filter->merge_commit || filter->with_commit) {
1120 commit = lookup_commit_reference_gently(oid->hash, 1);
1121 if (!commit)
1122 return 0;
1123 /* We perform the filtering for the '--contains' option */
1124 if (filter->with_commit &&
1125 !commit_contains(filter, commit))
1126 return 0;
1127 }
1128
1129 /*
1130 * We do not open the object yet; sort may only need refname
1131 * to do its job and the resulting list may yet to be pruned
1132 * by maxcount logic.
1133 */
1134 ref = new_ref_array_item(refname, oid->hash, flag);
1135 ref->commit = commit;
1136
1137 REALLOC_ARRAY(ref_cbdata->array->items, ref_cbdata->array->nr + 1);
1138 ref_cbdata->array->items[ref_cbdata->array->nr++] = ref;
1139 return 0;
1140 }
1141
1142 /* Free memory allocated for a ref_array_item */
1143 static void free_array_item(struct ref_array_item *item)
1144 {
1145 free((char *)item->symref);
1146 free(item);
1147 }
1148
1149 /* Free all memory allocated for ref_array */
1150 void ref_array_clear(struct ref_array *array)
1151 {
1152 int i;
1153
1154 for (i = 0; i < array->nr; i++)
1155 free_array_item(array->items[i]);
1156 free(array->items);
1157 array->items = NULL;
1158 array->nr = array->alloc = 0;
1159 }
1160
1161 static void do_merge_filter(struct ref_filter_cbdata *ref_cbdata)
1162 {
1163 struct rev_info revs;
1164 int i, old_nr;
1165 struct ref_filter *filter = ref_cbdata->filter;
1166 struct ref_array *array = ref_cbdata->array;
1167 struct commit **to_clear = xcalloc(sizeof(struct commit *), array->nr);
1168
1169 init_revisions(&revs, NULL);
1170
1171 for (i = 0; i < array->nr; i++) {
1172 struct ref_array_item *item = array->items[i];
1173 add_pending_object(&revs, &item->commit->object, item->refname);
1174 to_clear[i] = item->commit;
1175 }
1176
1177 filter->merge_commit->object.flags |= UNINTERESTING;
1178 add_pending_object(&revs, &filter->merge_commit->object, "");
1179
1180 revs.limited = 1;
1181 if (prepare_revision_walk(&revs))
1182 die(_("revision walk setup failed"));
1183
1184 old_nr = array->nr;
1185 array->nr = 0;
1186
1187 for (i = 0; i < old_nr; i++) {
1188 struct ref_array_item *item = array->items[i];
1189 struct commit *commit = item->commit;
1190
1191 int is_merged = !!(commit->object.flags & UNINTERESTING);
1192
1193 if (is_merged == (filter->merge == REF_FILTER_MERGED_INCLUDE))
1194 array->items[array->nr++] = array->items[i];
1195 else
1196 free_array_item(item);
1197 }
1198
1199 for (i = 0; i < old_nr; i++)
1200 clear_commit_marks(to_clear[i], ALL_REV_FLAGS);
1201 clear_commit_marks(filter->merge_commit, ALL_REV_FLAGS);
1202 free(to_clear);
1203 }
1204
1205 /*
1206 * API for filtering a set of refs. Based on the type of refs the user
1207 * has requested, we iterate through those refs and apply filters
1208 * as per the given ref_filter structure and finally store the
1209 * filtered refs in the ref_array structure.
1210 */
1211 int filter_refs(struct ref_array *array, struct ref_filter *filter, unsigned int type)
1212 {
1213 struct ref_filter_cbdata ref_cbdata;
1214 int ret = 0;
1215
1216 ref_cbdata.array = array;
1217 ref_cbdata.filter = filter;
1218
1219 /* Simple per-ref filtering */
1220 if (type & (FILTER_REFS_ALL | FILTER_REFS_INCLUDE_BROKEN))
1221 ret = for_each_rawref(ref_filter_handler, &ref_cbdata);
1222 else if (type & FILTER_REFS_ALL)
1223 ret = for_each_ref(ref_filter_handler, &ref_cbdata);
1224 else if (type)
1225 die("filter_refs: invalid type");
1226
1227 /* Filters that need revision walking */
1228 if (filter->merge_commit)
1229 do_merge_filter(&ref_cbdata);
1230
1231 return ret;
1232 }
1233
1234 static int cmp_ref_sorting(struct ref_sorting *s, struct ref_array_item *a, struct ref_array_item *b)
1235 {
1236 struct atom_value *va, *vb;
1237 int cmp;
1238 cmp_type cmp_type = used_atom_type[s->atom];
1239
1240 get_ref_atom_value(a, s->atom, &va);
1241 get_ref_atom_value(b, s->atom, &vb);
1242 switch (cmp_type) {
1243 case FIELD_STR:
1244 cmp = strcmp(va->s, vb->s);
1245 break;
1246 default:
1247 if (va->ul < vb->ul)
1248 cmp = -1;
1249 else if (va->ul == vb->ul)
1250 cmp = 0;
1251 else
1252 cmp = 1;
1253 break;
1254 }
1255 return (s->reverse) ? -cmp : cmp;
1256 }
1257
1258 static struct ref_sorting *ref_sorting;
1259 static int compare_refs(const void *a_, const void *b_)
1260 {
1261 struct ref_array_item *a = *((struct ref_array_item **)a_);
1262 struct ref_array_item *b = *((struct ref_array_item **)b_);
1263 struct ref_sorting *s;
1264
1265 for (s = ref_sorting; s; s = s->next) {
1266 int cmp = cmp_ref_sorting(s, a, b);
1267 if (cmp)
1268 return cmp;
1269 }
1270 return 0;
1271 }
1272
1273 void ref_array_sort(struct ref_sorting *sorting, struct ref_array *array)
1274 {
1275 ref_sorting = sorting;
1276 qsort(array->items, array->nr, sizeof(struct ref_array_item *), compare_refs);
1277 }
1278
1279 static int hex1(char ch)
1280 {
1281 if ('0' <= ch && ch <= '9')
1282 return ch - '0';
1283 else if ('a' <= ch && ch <= 'f')
1284 return ch - 'a' + 10;
1285 else if ('A' <= ch && ch <= 'F')
1286 return ch - 'A' + 10;
1287 return -1;
1288 }
1289 static int hex2(const char *cp)
1290 {
1291 if (cp[0] && cp[1])
1292 return (hex1(cp[0]) << 4) | hex1(cp[1]);
1293 else
1294 return -1;
1295 }
1296
1297 static void append_literal(const char *cp, const char *ep, struct ref_formatting_state *state)
1298 {
1299 struct strbuf *s = &state->stack->output;
1300
1301 while (*cp && (!ep || cp < ep)) {
1302 if (*cp == '%') {
1303 if (cp[1] == '%')
1304 cp++;
1305 else {
1306 int ch = hex2(cp + 1);
1307 if (0 <= ch) {
1308 strbuf_addch(s, ch);
1309 cp += 3;
1310 continue;
1311 }
1312 }
1313 }
1314 strbuf_addch(s, *cp);
1315 cp++;
1316 }
1317 }
1318
1319 void show_ref_array_item(struct ref_array_item *info, const char *format, int quote_style)
1320 {
1321 const char *cp, *sp, *ep;
1322 struct strbuf *final_buf;
1323 struct ref_formatting_state state = REF_FORMATTING_STATE_INIT;
1324
1325 state.quote_style = quote_style;
1326 push_stack_element(&state.stack);
1327
1328 for (cp = format; *cp && (sp = find_next(cp)); cp = ep + 1) {
1329 struct atom_value *atomv;
1330
1331 ep = strchr(sp, ')');
1332 if (cp < sp)
1333 append_literal(cp, sp, &state);
1334 get_ref_atom_value(info, parse_ref_filter_atom(sp + 2, ep), &atomv);
1335 atomv->handler(atomv, &state);
1336 }
1337 if (*cp) {
1338 sp = cp + strlen(cp);
1339 append_literal(cp, sp, &state);
1340 }
1341 if (need_color_reset_at_eol) {
1342 struct atom_value resetv;
1343 char color[COLOR_MAXLEN] = "";
1344
1345 if (color_parse("reset", color) < 0)
1346 die("BUG: couldn't parse 'reset' as a color");
1347 resetv.s = color;
1348 append_atom(&resetv, &state);
1349 }
1350 final_buf = &state.stack->output;
1351 fwrite(final_buf->buf, 1, final_buf->len, stdout);
1352 pop_stack_element(&state.stack);
1353 putchar('\n');
1354 }
1355
1356 /* If no sorting option is given, use refname to sort as default */
1357 struct ref_sorting *ref_default_sorting(void)
1358 {
1359 static const char cstr_name[] = "refname";
1360
1361 struct ref_sorting *sorting = xcalloc(1, sizeof(*sorting));
1362
1363 sorting->next = NULL;
1364 sorting->atom = parse_ref_filter_atom(cstr_name, cstr_name + strlen(cstr_name));
1365 return sorting;
1366 }
1367
1368 int parse_opt_ref_sorting(const struct option *opt, const char *arg, int unset)
1369 {
1370 struct ref_sorting **sorting_tail = opt->value;
1371 struct ref_sorting *s;
1372 int len;
1373
1374 if (!arg) /* should --no-sort void the list ? */
1375 return -1;
1376
1377 s = xcalloc(1, sizeof(*s));
1378 s->next = *sorting_tail;
1379 *sorting_tail = s;
1380
1381 if (*arg == '-') {
1382 s->reverse = 1;
1383 arg++;
1384 }
1385 len = strlen(arg);
1386 s->atom = parse_ref_filter_atom(arg, arg+len);
1387 return 0;
1388 }
1389
1390 int parse_opt_merge_filter(const struct option *opt, const char *arg, int unset)
1391 {
1392 struct ref_filter *rf = opt->value;
1393 unsigned char sha1[20];
1394
1395 rf->merge = starts_with(opt->long_name, "no")
1396 ? REF_FILTER_MERGED_OMIT
1397 : REF_FILTER_MERGED_INCLUDE;
1398
1399 if (get_sha1(arg, sha1))
1400 die(_("malformed object name %s"), arg);
1401
1402 rf->merge_commit = lookup_commit_reference_gently(sha1, 0);
1403 if (!rf->merge_commit)
1404 return opterror(opt, "must point to a commit", 0);
1405
1406 return 0;
1407 }
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