Merge branch 'sg/test-bash-version-fix'
[git.git] / trailer.c
blob0796f326b36bac334cbf7ca5162cb22c4b62d1e8
1 #include "cache.h"
2 #include "config.h"
3 #include "string-list.h"
4 #include "run-command.h"
5 #include "commit.h"
6 #include "tempfile.h"
7 #include "trailer.h"
8 #include "list.h"
9 /*
10 * Copyright (c) 2013, 2014 Christian Couder <chriscool@tuxfamily.org>
13 struct conf_info {
14 char *name;
15 char *key;
16 char *command;
17 enum trailer_where where;
18 enum trailer_if_exists if_exists;
19 enum trailer_if_missing if_missing;
22 static struct conf_info default_conf_info;
24 struct trailer_item {
25 struct list_head list;
27 * If this is not a trailer line, the line is stored in value
28 * (excluding the terminating newline) and token is NULL.
30 char *token;
31 char *value;
34 struct arg_item {
35 struct list_head list;
36 char *token;
37 char *value;
38 struct conf_info conf;
41 static LIST_HEAD(conf_head);
43 static char *separators = ":";
45 static int configured;
47 #define TRAILER_ARG_STRING "$ARG"
49 static const char *git_generated_prefixes[] = {
50 "Signed-off-by: ",
51 "(cherry picked from commit ",
52 NULL
55 /* Iterate over the elements of the list. */
56 #define list_for_each_dir(pos, head, is_reverse) \
57 for (pos = is_reverse ? (head)->prev : (head)->next; \
58 pos != (head); \
59 pos = is_reverse ? pos->prev : pos->next)
61 static int after_or_end(enum trailer_where where)
63 return (where == WHERE_AFTER) || (where == WHERE_END);
67 * Return the length of the string not including any final
68 * punctuation. E.g., the input "Signed-off-by:" would return
69 * 13, stripping the trailing punctuation but retaining
70 * internal punctuation.
72 static size_t token_len_without_separator(const char *token, size_t len)
74 while (len > 0 && !isalnum(token[len - 1]))
75 len--;
76 return len;
79 static int same_token(struct trailer_item *a, struct arg_item *b)
81 size_t a_len, b_len, min_len;
83 if (!a->token)
84 return 0;
86 a_len = token_len_without_separator(a->token, strlen(a->token));
87 b_len = token_len_without_separator(b->token, strlen(b->token));
88 min_len = (a_len > b_len) ? b_len : a_len;
90 return !strncasecmp(a->token, b->token, min_len);
93 static int same_value(struct trailer_item *a, struct arg_item *b)
95 return !strcasecmp(a->value, b->value);
98 static int same_trailer(struct trailer_item *a, struct arg_item *b)
100 return same_token(a, b) && same_value(a, b);
103 static inline int is_blank_line(const char *str)
105 const char *s = str;
106 while (*s && *s != '\n' && isspace(*s))
107 s++;
108 return !*s || *s == '\n';
111 static inline void strbuf_replace(struct strbuf *sb, const char *a, const char *b)
113 const char *ptr = strstr(sb->buf, a);
114 if (ptr)
115 strbuf_splice(sb, ptr - sb->buf, strlen(a), b, strlen(b));
118 static void free_trailer_item(struct trailer_item *item)
120 free(item->token);
121 free(item->value);
122 free(item);
125 static void free_arg_item(struct arg_item *item)
127 free(item->conf.name);
128 free(item->conf.key);
129 free(item->conf.command);
130 free(item->token);
131 free(item->value);
132 free(item);
135 static char last_non_space_char(const char *s)
137 int i;
138 for (i = strlen(s) - 1; i >= 0; i--)
139 if (!isspace(s[i]))
140 return s[i];
141 return '\0';
144 static void print_tok_val(FILE *outfile, const char *tok, const char *val)
146 char c;
148 if (!tok) {
149 fprintf(outfile, "%s\n", val);
150 return;
153 c = last_non_space_char(tok);
154 if (!c)
155 return;
156 if (strchr(separators, c))
157 fprintf(outfile, "%s%s\n", tok, val);
158 else
159 fprintf(outfile, "%s%c %s\n", tok, separators[0], val);
162 static void print_all(FILE *outfile, struct list_head *head,
163 const struct process_trailer_options *opts)
165 struct list_head *pos;
166 struct trailer_item *item;
167 list_for_each(pos, head) {
168 item = list_entry(pos, struct trailer_item, list);
169 if ((!opts->trim_empty || strlen(item->value) > 0) &&
170 (!opts->only_trailers || item->token))
171 print_tok_val(outfile, item->token, item->value);
175 static struct trailer_item *trailer_from_arg(struct arg_item *arg_tok)
177 struct trailer_item *new_item = xcalloc(sizeof(*new_item), 1);
178 new_item->token = arg_tok->token;
179 new_item->value = arg_tok->value;
180 arg_tok->token = arg_tok->value = NULL;
181 free_arg_item(arg_tok);
182 return new_item;
185 static void add_arg_to_input_list(struct trailer_item *on_tok,
186 struct arg_item *arg_tok)
188 int aoe = after_or_end(arg_tok->conf.where);
189 struct trailer_item *to_add = trailer_from_arg(arg_tok);
190 if (aoe)
191 list_add(&to_add->list, &on_tok->list);
192 else
193 list_add_tail(&to_add->list, &on_tok->list);
196 static int check_if_different(struct trailer_item *in_tok,
197 struct arg_item *arg_tok,
198 int check_all,
199 struct list_head *head)
201 enum trailer_where where = arg_tok->conf.where;
202 struct list_head *next_head;
203 do {
204 if (same_trailer(in_tok, arg_tok))
205 return 0;
207 * if we want to add a trailer after another one,
208 * we have to check those before this one
210 next_head = after_or_end(where) ? in_tok->list.prev
211 : in_tok->list.next;
212 if (next_head == head)
213 break;
214 in_tok = list_entry(next_head, struct trailer_item, list);
215 } while (check_all);
216 return 1;
219 static char *apply_command(const char *command, const char *arg)
221 struct strbuf cmd = STRBUF_INIT;
222 struct strbuf buf = STRBUF_INIT;
223 struct child_process cp = CHILD_PROCESS_INIT;
224 const char *argv[] = {NULL, NULL};
225 char *result;
227 strbuf_addstr(&cmd, command);
228 if (arg)
229 strbuf_replace(&cmd, TRAILER_ARG_STRING, arg);
231 argv[0] = cmd.buf;
232 cp.argv = argv;
233 cp.env = local_repo_env;
234 cp.no_stdin = 1;
235 cp.use_shell = 1;
237 if (capture_command(&cp, &buf, 1024)) {
238 error(_("running trailer command '%s' failed"), cmd.buf);
239 strbuf_release(&buf);
240 result = xstrdup("");
241 } else {
242 strbuf_trim(&buf);
243 result = strbuf_detach(&buf, NULL);
246 strbuf_release(&cmd);
247 return result;
250 static void apply_item_command(struct trailer_item *in_tok, struct arg_item *arg_tok)
252 if (arg_tok->conf.command) {
253 const char *arg;
254 if (arg_tok->value && arg_tok->value[0]) {
255 arg = arg_tok->value;
256 } else {
257 if (in_tok && in_tok->value)
258 arg = xstrdup(in_tok->value);
259 else
260 arg = xstrdup("");
262 arg_tok->value = apply_command(arg_tok->conf.command, arg);
263 free((char *)arg);
267 static void apply_arg_if_exists(struct trailer_item *in_tok,
268 struct arg_item *arg_tok,
269 struct trailer_item *on_tok,
270 struct list_head *head)
272 switch (arg_tok->conf.if_exists) {
273 case EXISTS_DO_NOTHING:
274 free_arg_item(arg_tok);
275 break;
276 case EXISTS_REPLACE:
277 apply_item_command(in_tok, arg_tok);
278 add_arg_to_input_list(on_tok, arg_tok);
279 list_del(&in_tok->list);
280 free_trailer_item(in_tok);
281 break;
282 case EXISTS_ADD:
283 apply_item_command(in_tok, arg_tok);
284 add_arg_to_input_list(on_tok, arg_tok);
285 break;
286 case EXISTS_ADD_IF_DIFFERENT:
287 apply_item_command(in_tok, arg_tok);
288 if (check_if_different(in_tok, arg_tok, 1, head))
289 add_arg_to_input_list(on_tok, arg_tok);
290 else
291 free_arg_item(arg_tok);
292 break;
293 case EXISTS_ADD_IF_DIFFERENT_NEIGHBOR:
294 apply_item_command(in_tok, arg_tok);
295 if (check_if_different(on_tok, arg_tok, 0, head))
296 add_arg_to_input_list(on_tok, arg_tok);
297 else
298 free_arg_item(arg_tok);
299 break;
300 default:
301 BUG("trailer.c: unhandled value %d",
302 arg_tok->conf.if_exists);
306 static void apply_arg_if_missing(struct list_head *head,
307 struct arg_item *arg_tok)
309 enum trailer_where where;
310 struct trailer_item *to_add;
312 switch (arg_tok->conf.if_missing) {
313 case MISSING_DO_NOTHING:
314 free_arg_item(arg_tok);
315 break;
316 case MISSING_ADD:
317 where = arg_tok->conf.where;
318 apply_item_command(NULL, arg_tok);
319 to_add = trailer_from_arg(arg_tok);
320 if (after_or_end(where))
321 list_add_tail(&to_add->list, head);
322 else
323 list_add(&to_add->list, head);
324 break;
325 default:
326 BUG("trailer.c: unhandled value %d",
327 arg_tok->conf.if_missing);
331 static int find_same_and_apply_arg(struct list_head *head,
332 struct arg_item *arg_tok)
334 struct list_head *pos;
335 struct trailer_item *in_tok;
336 struct trailer_item *on_tok;
338 enum trailer_where where = arg_tok->conf.where;
339 int middle = (where == WHERE_AFTER) || (where == WHERE_BEFORE);
340 int backwards = after_or_end(where);
341 struct trailer_item *start_tok;
343 if (list_empty(head))
344 return 0;
346 start_tok = list_entry(backwards ? head->prev : head->next,
347 struct trailer_item,
348 list);
350 list_for_each_dir(pos, head, backwards) {
351 in_tok = list_entry(pos, struct trailer_item, list);
352 if (!same_token(in_tok, arg_tok))
353 continue;
354 on_tok = middle ? in_tok : start_tok;
355 apply_arg_if_exists(in_tok, arg_tok, on_tok, head);
356 return 1;
358 return 0;
361 static void process_trailers_lists(struct list_head *head,
362 struct list_head *arg_head)
364 struct list_head *pos, *p;
365 struct arg_item *arg_tok;
367 list_for_each_safe(pos, p, arg_head) {
368 int applied = 0;
369 arg_tok = list_entry(pos, struct arg_item, list);
371 list_del(pos);
373 applied = find_same_and_apply_arg(head, arg_tok);
375 if (!applied)
376 apply_arg_if_missing(head, arg_tok);
380 int trailer_set_where(enum trailer_where *item, const char *value)
382 if (!value)
383 *item = WHERE_DEFAULT;
384 else if (!strcasecmp("after", value))
385 *item = WHERE_AFTER;
386 else if (!strcasecmp("before", value))
387 *item = WHERE_BEFORE;
388 else if (!strcasecmp("end", value))
389 *item = WHERE_END;
390 else if (!strcasecmp("start", value))
391 *item = WHERE_START;
392 else
393 return -1;
394 return 0;
397 int trailer_set_if_exists(enum trailer_if_exists *item, const char *value)
399 if (!value)
400 *item = EXISTS_DEFAULT;
401 else if (!strcasecmp("addIfDifferent", value))
402 *item = EXISTS_ADD_IF_DIFFERENT;
403 else if (!strcasecmp("addIfDifferentNeighbor", value))
404 *item = EXISTS_ADD_IF_DIFFERENT_NEIGHBOR;
405 else if (!strcasecmp("add", value))
406 *item = EXISTS_ADD;
407 else if (!strcasecmp("replace", value))
408 *item = EXISTS_REPLACE;
409 else if (!strcasecmp("doNothing", value))
410 *item = EXISTS_DO_NOTHING;
411 else
412 return -1;
413 return 0;
416 int trailer_set_if_missing(enum trailer_if_missing *item, const char *value)
418 if (!value)
419 *item = MISSING_DEFAULT;
420 else if (!strcasecmp("doNothing", value))
421 *item = MISSING_DO_NOTHING;
422 else if (!strcasecmp("add", value))
423 *item = MISSING_ADD;
424 else
425 return -1;
426 return 0;
429 static void duplicate_conf(struct conf_info *dst, const struct conf_info *src)
431 *dst = *src;
432 dst->name = xstrdup_or_null(src->name);
433 dst->key = xstrdup_or_null(src->key);
434 dst->command = xstrdup_or_null(src->command);
437 static struct arg_item *get_conf_item(const char *name)
439 struct list_head *pos;
440 struct arg_item *item;
442 /* Look up item with same name */
443 list_for_each(pos, &conf_head) {
444 item = list_entry(pos, struct arg_item, list);
445 if (!strcasecmp(item->conf.name, name))
446 return item;
449 /* Item does not already exists, create it */
450 item = xcalloc(sizeof(*item), 1);
451 duplicate_conf(&item->conf, &default_conf_info);
452 item->conf.name = xstrdup(name);
454 list_add_tail(&item->list, &conf_head);
456 return item;
459 enum trailer_info_type { TRAILER_KEY, TRAILER_COMMAND, TRAILER_WHERE,
460 TRAILER_IF_EXISTS, TRAILER_IF_MISSING };
462 static struct {
463 const char *name;
464 enum trailer_info_type type;
465 } trailer_config_items[] = {
466 { "key", TRAILER_KEY },
467 { "command", TRAILER_COMMAND },
468 { "where", TRAILER_WHERE },
469 { "ifexists", TRAILER_IF_EXISTS },
470 { "ifmissing", TRAILER_IF_MISSING }
473 static int git_trailer_default_config(const char *conf_key, const char *value, void *cb)
475 const char *trailer_item, *variable_name;
477 if (!skip_prefix(conf_key, "trailer.", &trailer_item))
478 return 0;
480 variable_name = strrchr(trailer_item, '.');
481 if (!variable_name) {
482 if (!strcmp(trailer_item, "where")) {
483 if (trailer_set_where(&default_conf_info.where,
484 value) < 0)
485 warning(_("unknown value '%s' for key '%s'"),
486 value, conf_key);
487 } else if (!strcmp(trailer_item, "ifexists")) {
488 if (trailer_set_if_exists(&default_conf_info.if_exists,
489 value) < 0)
490 warning(_("unknown value '%s' for key '%s'"),
491 value, conf_key);
492 } else if (!strcmp(trailer_item, "ifmissing")) {
493 if (trailer_set_if_missing(&default_conf_info.if_missing,
494 value) < 0)
495 warning(_("unknown value '%s' for key '%s'"),
496 value, conf_key);
497 } else if (!strcmp(trailer_item, "separators")) {
498 separators = xstrdup(value);
501 return 0;
504 static int git_trailer_config(const char *conf_key, const char *value, void *cb)
506 const char *trailer_item, *variable_name;
507 struct arg_item *item;
508 struct conf_info *conf;
509 char *name = NULL;
510 enum trailer_info_type type;
511 int i;
513 if (!skip_prefix(conf_key, "trailer.", &trailer_item))
514 return 0;
516 variable_name = strrchr(trailer_item, '.');
517 if (!variable_name)
518 return 0;
520 variable_name++;
521 for (i = 0; i < ARRAY_SIZE(trailer_config_items); i++) {
522 if (strcmp(trailer_config_items[i].name, variable_name))
523 continue;
524 name = xstrndup(trailer_item, variable_name - trailer_item - 1);
525 type = trailer_config_items[i].type;
526 break;
529 if (!name)
530 return 0;
532 item = get_conf_item(name);
533 conf = &item->conf;
534 free(name);
536 switch (type) {
537 case TRAILER_KEY:
538 if (conf->key)
539 warning(_("more than one %s"), conf_key);
540 conf->key = xstrdup(value);
541 break;
542 case TRAILER_COMMAND:
543 if (conf->command)
544 warning(_("more than one %s"), conf_key);
545 conf->command = xstrdup(value);
546 break;
547 case TRAILER_WHERE:
548 if (trailer_set_where(&conf->where, value))
549 warning(_("unknown value '%s' for key '%s'"), value, conf_key);
550 break;
551 case TRAILER_IF_EXISTS:
552 if (trailer_set_if_exists(&conf->if_exists, value))
553 warning(_("unknown value '%s' for key '%s'"), value, conf_key);
554 break;
555 case TRAILER_IF_MISSING:
556 if (trailer_set_if_missing(&conf->if_missing, value))
557 warning(_("unknown value '%s' for key '%s'"), value, conf_key);
558 break;
559 default:
560 BUG("trailer.c: unhandled type %d", type);
562 return 0;
565 static void ensure_configured(void)
567 if (configured)
568 return;
570 /* Default config must be setup first */
571 default_conf_info.where = WHERE_END;
572 default_conf_info.if_exists = EXISTS_ADD_IF_DIFFERENT_NEIGHBOR;
573 default_conf_info.if_missing = MISSING_ADD;
574 git_config(git_trailer_default_config, NULL);
575 git_config(git_trailer_config, NULL);
576 configured = 1;
579 static const char *token_from_item(struct arg_item *item, char *tok)
581 if (item->conf.key)
582 return item->conf.key;
583 if (tok)
584 return tok;
585 return item->conf.name;
588 static int token_matches_item(const char *tok, struct arg_item *item, size_t tok_len)
590 if (!strncasecmp(tok, item->conf.name, tok_len))
591 return 1;
592 return item->conf.key ? !strncasecmp(tok, item->conf.key, tok_len) : 0;
596 * If the given line is of the form
597 * "<token><optional whitespace><separator>..." or "<separator>...", return the
598 * location of the separator. Otherwise, return -1. The optional whitespace
599 * is allowed there primarily to allow things like "Bug #43" where <token> is
600 * "Bug" and <separator> is "#".
602 * The separator-starts-line case (in which this function returns 0) is
603 * distinguished from the non-well-formed-line case (in which this function
604 * returns -1) because some callers of this function need such a distinction.
606 static ssize_t find_separator(const char *line, const char *separators)
608 int whitespace_found = 0;
609 const char *c;
610 for (c = line; *c; c++) {
611 if (strchr(separators, *c))
612 return c - line;
613 if (!whitespace_found && (isalnum(*c) || *c == '-'))
614 continue;
615 if (c != line && (*c == ' ' || *c == '\t')) {
616 whitespace_found = 1;
617 continue;
619 break;
621 return -1;
625 * Obtain the token, value, and conf from the given trailer.
627 * separator_pos must not be 0, since the token cannot be an empty string.
629 * If separator_pos is -1, interpret the whole trailer as a token.
631 static void parse_trailer(struct strbuf *tok, struct strbuf *val,
632 const struct conf_info **conf, const char *trailer,
633 ssize_t separator_pos)
635 struct arg_item *item;
636 size_t tok_len;
637 struct list_head *pos;
639 if (separator_pos != -1) {
640 strbuf_add(tok, trailer, separator_pos);
641 strbuf_trim(tok);
642 strbuf_addstr(val, trailer + separator_pos + 1);
643 strbuf_trim(val);
644 } else {
645 strbuf_addstr(tok, trailer);
646 strbuf_trim(tok);
649 /* Lookup if the token matches something in the config */
650 tok_len = token_len_without_separator(tok->buf, tok->len);
651 if (conf)
652 *conf = &default_conf_info;
653 list_for_each(pos, &conf_head) {
654 item = list_entry(pos, struct arg_item, list);
655 if (token_matches_item(tok->buf, item, tok_len)) {
656 char *tok_buf = strbuf_detach(tok, NULL);
657 if (conf)
658 *conf = &item->conf;
659 strbuf_addstr(tok, token_from_item(item, tok_buf));
660 free(tok_buf);
661 break;
666 static struct trailer_item *add_trailer_item(struct list_head *head, char *tok,
667 char *val)
669 struct trailer_item *new_item = xcalloc(sizeof(*new_item), 1);
670 new_item->token = tok;
671 new_item->value = val;
672 list_add_tail(&new_item->list, head);
673 return new_item;
676 static void add_arg_item(struct list_head *arg_head, char *tok, char *val,
677 const struct conf_info *conf,
678 const struct new_trailer_item *new_trailer_item)
680 struct arg_item *new_item = xcalloc(sizeof(*new_item), 1);
681 new_item->token = tok;
682 new_item->value = val;
683 duplicate_conf(&new_item->conf, conf);
684 if (new_trailer_item) {
685 if (new_trailer_item->where != WHERE_DEFAULT)
686 new_item->conf.where = new_trailer_item->where;
687 if (new_trailer_item->if_exists != EXISTS_DEFAULT)
688 new_item->conf.if_exists = new_trailer_item->if_exists;
689 if (new_trailer_item->if_missing != MISSING_DEFAULT)
690 new_item->conf.if_missing = new_trailer_item->if_missing;
692 list_add_tail(&new_item->list, arg_head);
695 static void process_command_line_args(struct list_head *arg_head,
696 struct list_head *new_trailer_head)
698 struct arg_item *item;
699 struct strbuf tok = STRBUF_INIT;
700 struct strbuf val = STRBUF_INIT;
701 const struct conf_info *conf;
702 struct list_head *pos;
705 * In command-line arguments, '=' is accepted (in addition to the
706 * separators that are defined).
708 char *cl_separators = xstrfmt("=%s", separators);
710 /* Add an arg item for each configured trailer with a command */
711 list_for_each(pos, &conf_head) {
712 item = list_entry(pos, struct arg_item, list);
713 if (item->conf.command)
714 add_arg_item(arg_head,
715 xstrdup(token_from_item(item, NULL)),
716 xstrdup(""),
717 &item->conf, NULL);
720 /* Add an arg item for each trailer on the command line */
721 list_for_each(pos, new_trailer_head) {
722 struct new_trailer_item *tr =
723 list_entry(pos, struct new_trailer_item, list);
724 ssize_t separator_pos = find_separator(tr->text, cl_separators);
726 if (separator_pos == 0) {
727 struct strbuf sb = STRBUF_INIT;
728 strbuf_addstr(&sb, tr->text);
729 strbuf_trim(&sb);
730 error(_("empty trailer token in trailer '%.*s'"),
731 (int) sb.len, sb.buf);
732 strbuf_release(&sb);
733 } else {
734 parse_trailer(&tok, &val, &conf, tr->text,
735 separator_pos);
736 add_arg_item(arg_head,
737 strbuf_detach(&tok, NULL),
738 strbuf_detach(&val, NULL),
739 conf, tr);
743 free(cl_separators);
746 static void read_input_file(struct strbuf *sb, const char *file)
748 if (file) {
749 if (strbuf_read_file(sb, file, 0) < 0)
750 die_errno(_("could not read input file '%s'"), file);
751 } else {
752 if (strbuf_read(sb, fileno(stdin), 0) < 0)
753 die_errno(_("could not read from stdin"));
757 static const char *next_line(const char *str)
759 const char *nl = strchrnul(str, '\n');
760 return nl + !!*nl;
764 * Return the position of the start of the last line. If len is 0, return -1.
766 static ssize_t last_line(const char *buf, size_t len)
768 ssize_t i;
769 if (len == 0)
770 return -1;
771 if (len == 1)
772 return 0;
774 * Skip the last character (in addition to the null terminator),
775 * because if the last character is a newline, it is considered as part
776 * of the last line anyway.
778 i = len - 2;
780 for (; i >= 0; i--) {
781 if (buf[i] == '\n')
782 return i + 1;
784 return 0;
788 * Return the position of the start of the patch or the length of str if there
789 * is no patch in the message.
791 static size_t find_patch_start(const char *str)
793 const char *s;
795 for (s = str; *s; s = next_line(s)) {
796 const char *v;
798 if (skip_prefix(s, "---", &v) && isspace(*v))
799 return s - str;
802 return s - str;
806 * Return the position of the first trailer line or len if there are no
807 * trailers.
809 static size_t find_trailer_start(const char *buf, size_t len)
811 const char *s;
812 ssize_t end_of_title, l;
813 int only_spaces = 1;
814 int recognized_prefix = 0, trailer_lines = 0, non_trailer_lines = 0;
816 * Number of possible continuation lines encountered. This will be
817 * reset to 0 if we encounter a trailer (since those lines are to be
818 * considered continuations of that trailer), and added to
819 * non_trailer_lines if we encounter a non-trailer (since those lines
820 * are to be considered non-trailers).
822 int possible_continuation_lines = 0;
824 /* The first paragraph is the title and cannot be trailers */
825 for (s = buf; s < buf + len; s = next_line(s)) {
826 if (s[0] == comment_line_char)
827 continue;
828 if (is_blank_line(s))
829 break;
831 end_of_title = s - buf;
834 * Get the start of the trailers by looking starting from the end for a
835 * blank line before a set of non-blank lines that (i) are all
836 * trailers, or (ii) contains at least one Git-generated trailer and
837 * consists of at least 25% trailers.
839 for (l = last_line(buf, len);
840 l >= end_of_title;
841 l = last_line(buf, l)) {
842 const char *bol = buf + l;
843 const char **p;
844 ssize_t separator_pos;
846 if (bol[0] == comment_line_char) {
847 non_trailer_lines += possible_continuation_lines;
848 possible_continuation_lines = 0;
849 continue;
851 if (is_blank_line(bol)) {
852 if (only_spaces)
853 continue;
854 non_trailer_lines += possible_continuation_lines;
855 if (recognized_prefix &&
856 trailer_lines * 3 >= non_trailer_lines)
857 return next_line(bol) - buf;
858 else if (trailer_lines && !non_trailer_lines)
859 return next_line(bol) - buf;
860 return len;
862 only_spaces = 0;
864 for (p = git_generated_prefixes; *p; p++) {
865 if (starts_with(bol, *p)) {
866 trailer_lines++;
867 possible_continuation_lines = 0;
868 recognized_prefix = 1;
869 goto continue_outer_loop;
873 separator_pos = find_separator(bol, separators);
874 if (separator_pos >= 1 && !isspace(bol[0])) {
875 struct list_head *pos;
877 trailer_lines++;
878 possible_continuation_lines = 0;
879 if (recognized_prefix)
880 continue;
881 list_for_each(pos, &conf_head) {
882 struct arg_item *item;
883 item = list_entry(pos, struct arg_item, list);
884 if (token_matches_item(bol, item,
885 separator_pos)) {
886 recognized_prefix = 1;
887 break;
890 } else if (isspace(bol[0]))
891 possible_continuation_lines++;
892 else {
893 non_trailer_lines++;
894 non_trailer_lines += possible_continuation_lines;
895 possible_continuation_lines = 0;
897 continue_outer_loop:
901 return len;
904 /* Return the position of the end of the trailers. */
905 static size_t find_trailer_end(const char *buf, size_t len)
907 return len - ignore_non_trailer(buf, len);
910 static int ends_with_blank_line(const char *buf, size_t len)
912 ssize_t ll = last_line(buf, len);
913 if (ll < 0)
914 return 0;
915 return is_blank_line(buf + ll);
918 static void unfold_value(struct strbuf *val)
920 struct strbuf out = STRBUF_INIT;
921 size_t i;
923 strbuf_grow(&out, val->len);
924 i = 0;
925 while (i < val->len) {
926 char c = val->buf[i++];
927 if (c == '\n') {
928 /* Collapse continuation down to a single space. */
929 while (i < val->len && isspace(val->buf[i]))
930 i++;
931 strbuf_addch(&out, ' ');
932 } else {
933 strbuf_addch(&out, c);
937 /* Empty lines may have left us with whitespace cruft at the edges */
938 strbuf_trim(&out);
940 /* output goes back to val as if we modified it in-place */
941 strbuf_swap(&out, val);
942 strbuf_release(&out);
945 static size_t process_input_file(FILE *outfile,
946 const char *str,
947 struct list_head *head,
948 const struct process_trailer_options *opts)
950 struct trailer_info info;
951 struct strbuf tok = STRBUF_INIT;
952 struct strbuf val = STRBUF_INIT;
953 size_t i;
955 trailer_info_get(&info, str, opts);
957 /* Print lines before the trailers as is */
958 if (!opts->only_trailers)
959 fwrite(str, 1, info.trailer_start - str, outfile);
961 if (!opts->only_trailers && !info.blank_line_before_trailer)
962 fprintf(outfile, "\n");
964 for (i = 0; i < info.trailer_nr; i++) {
965 int separator_pos;
966 char *trailer = info.trailers[i];
967 if (trailer[0] == comment_line_char)
968 continue;
969 separator_pos = find_separator(trailer, separators);
970 if (separator_pos >= 1) {
971 parse_trailer(&tok, &val, NULL, trailer,
972 separator_pos);
973 if (opts->unfold)
974 unfold_value(&val);
975 add_trailer_item(head,
976 strbuf_detach(&tok, NULL),
977 strbuf_detach(&val, NULL));
978 } else if (!opts->only_trailers) {
979 strbuf_addstr(&val, trailer);
980 strbuf_strip_suffix(&val, "\n");
981 add_trailer_item(head,
982 NULL,
983 strbuf_detach(&val, NULL));
987 trailer_info_release(&info);
989 return info.trailer_end - str;
992 static void free_all(struct list_head *head)
994 struct list_head *pos, *p;
995 list_for_each_safe(pos, p, head) {
996 list_del(pos);
997 free_trailer_item(list_entry(pos, struct trailer_item, list));
1001 static struct tempfile *trailers_tempfile;
1003 static FILE *create_in_place_tempfile(const char *file)
1005 struct stat st;
1006 struct strbuf filename_template = STRBUF_INIT;
1007 const char *tail;
1008 FILE *outfile;
1010 if (stat(file, &st))
1011 die_errno(_("could not stat %s"), file);
1012 if (!S_ISREG(st.st_mode))
1013 die(_("file %s is not a regular file"), file);
1014 if (!(st.st_mode & S_IWUSR))
1015 die(_("file %s is not writable by user"), file);
1017 /* Create temporary file in the same directory as the original */
1018 tail = strrchr(file, '/');
1019 if (tail != NULL)
1020 strbuf_add(&filename_template, file, tail - file + 1);
1021 strbuf_addstr(&filename_template, "git-interpret-trailers-XXXXXX");
1023 trailers_tempfile = xmks_tempfile_m(filename_template.buf, st.st_mode);
1024 strbuf_release(&filename_template);
1025 outfile = fdopen_tempfile(trailers_tempfile, "w");
1026 if (!outfile)
1027 die_errno(_("could not open temporary file"));
1029 return outfile;
1032 void process_trailers(const char *file,
1033 const struct process_trailer_options *opts,
1034 struct list_head *new_trailer_head)
1036 LIST_HEAD(head);
1037 struct strbuf sb = STRBUF_INIT;
1038 size_t trailer_end;
1039 FILE *outfile = stdout;
1041 ensure_configured();
1043 read_input_file(&sb, file);
1045 if (opts->in_place)
1046 outfile = create_in_place_tempfile(file);
1048 /* Print the lines before the trailers */
1049 trailer_end = process_input_file(outfile, sb.buf, &head, opts);
1051 if (!opts->only_input) {
1052 LIST_HEAD(arg_head);
1053 process_command_line_args(&arg_head, new_trailer_head);
1054 process_trailers_lists(&head, &arg_head);
1057 print_all(outfile, &head, opts);
1059 free_all(&head);
1061 /* Print the lines after the trailers as is */
1062 if (!opts->only_trailers)
1063 fwrite(sb.buf + trailer_end, 1, sb.len - trailer_end, outfile);
1065 if (opts->in_place)
1066 if (rename_tempfile(&trailers_tempfile, file))
1067 die_errno(_("could not rename temporary file to %s"), file);
1069 strbuf_release(&sb);
1072 void trailer_info_get(struct trailer_info *info, const char *str,
1073 const struct process_trailer_options *opts)
1075 int patch_start, trailer_end, trailer_start;
1076 struct strbuf **trailer_lines, **ptr;
1077 char **trailer_strings = NULL;
1078 size_t nr = 0, alloc = 0;
1079 char **last = NULL;
1081 ensure_configured();
1083 if (opts->no_divider)
1084 patch_start = strlen(str);
1085 else
1086 patch_start = find_patch_start(str);
1088 trailer_end = find_trailer_end(str, patch_start);
1089 trailer_start = find_trailer_start(str, trailer_end);
1091 trailer_lines = strbuf_split_buf(str + trailer_start,
1092 trailer_end - trailer_start,
1093 '\n',
1095 for (ptr = trailer_lines; *ptr; ptr++) {
1096 if (last && isspace((*ptr)->buf[0])) {
1097 struct strbuf sb = STRBUF_INIT;
1098 strbuf_attach(&sb, *last, strlen(*last), strlen(*last));
1099 strbuf_addbuf(&sb, *ptr);
1100 *last = strbuf_detach(&sb, NULL);
1101 continue;
1103 ALLOC_GROW(trailer_strings, nr + 1, alloc);
1104 trailer_strings[nr] = strbuf_detach(*ptr, NULL);
1105 last = find_separator(trailer_strings[nr], separators) >= 1
1106 ? &trailer_strings[nr]
1107 : NULL;
1108 nr++;
1110 strbuf_list_free(trailer_lines);
1112 info->blank_line_before_trailer = ends_with_blank_line(str,
1113 trailer_start);
1114 info->trailer_start = str + trailer_start;
1115 info->trailer_end = str + trailer_end;
1116 info->trailers = trailer_strings;
1117 info->trailer_nr = nr;
1120 void trailer_info_release(struct trailer_info *info)
1122 size_t i;
1123 for (i = 0; i < info->trailer_nr; i++)
1124 free(info->trailers[i]);
1125 free(info->trailers);
1128 static void format_trailer_info(struct strbuf *out,
1129 const struct trailer_info *info,
1130 const struct process_trailer_options *opts)
1132 size_t i;
1134 /* If we want the whole block untouched, we can take the fast path. */
1135 if (!opts->only_trailers && !opts->unfold) {
1136 strbuf_add(out, info->trailer_start,
1137 info->trailer_end - info->trailer_start);
1138 return;
1141 for (i = 0; i < info->trailer_nr; i++) {
1142 char *trailer = info->trailers[i];
1143 ssize_t separator_pos = find_separator(trailer, separators);
1145 if (separator_pos >= 1) {
1146 struct strbuf tok = STRBUF_INIT;
1147 struct strbuf val = STRBUF_INIT;
1149 parse_trailer(&tok, &val, NULL, trailer, separator_pos);
1150 if (opts->unfold)
1151 unfold_value(&val);
1153 strbuf_addf(out, "%s: %s\n", tok.buf, val.buf);
1154 strbuf_release(&tok);
1155 strbuf_release(&val);
1157 } else if (!opts->only_trailers) {
1158 strbuf_addstr(out, trailer);
1164 void format_trailers_from_commit(struct strbuf *out, const char *msg,
1165 const struct process_trailer_options *opts)
1167 struct trailer_info info;
1169 trailer_info_get(&info, msg, opts);
1170 format_trailer_info(out, &info, opts);
1171 trailer_info_release(&info);