tgupdate: merge girocco base into girocco
[git/gitweb.git] / trailer.c
blobf0ecde2d2f8b35c565ab176c76882a5fee8d8fb2
1 #include "cache.h"
2 #include "string-list.h"
3 #include "run-command.h"
4 #include "commit.h"
5 #include "tempfile.h"
6 #include "trailer.h"
7 #include "list.h"
8 /*
9 * Copyright (c) 2013, 2014 Christian Couder <chriscool@tuxfamily.org>
12 enum action_where { WHERE_END, WHERE_AFTER, WHERE_BEFORE, WHERE_START };
13 enum action_if_exists { EXISTS_ADD_IF_DIFFERENT_NEIGHBOR, EXISTS_ADD_IF_DIFFERENT,
14 EXISTS_ADD, EXISTS_REPLACE, EXISTS_DO_NOTHING };
15 enum action_if_missing { MISSING_ADD, MISSING_DO_NOTHING };
17 struct conf_info {
18 char *name;
19 char *key;
20 char *command;
21 enum action_where where;
22 enum action_if_exists if_exists;
23 enum action_if_missing if_missing;
26 static struct conf_info default_conf_info;
28 struct trailer_item {
29 struct list_head list;
31 * If this is not a trailer line, the line is stored in value
32 * (excluding the terminating newline) and token is NULL.
34 char *token;
35 char *value;
38 struct arg_item {
39 struct list_head list;
40 char *token;
41 char *value;
42 struct conf_info conf;
45 static LIST_HEAD(conf_head);
47 static char *separators = ":";
49 #define TRAILER_ARG_STRING "$ARG"
51 static const char *git_generated_prefixes[] = {
52 "Signed-off-by: ",
53 "(cherry picked from commit ",
54 NULL
57 /* Iterate over the elements of the list. */
58 #define list_for_each_dir(pos, head, is_reverse) \
59 for (pos = is_reverse ? (head)->prev : (head)->next; \
60 pos != (head); \
61 pos = is_reverse ? pos->prev : pos->next)
63 static int after_or_end(enum action_where where)
65 return (where == WHERE_AFTER) || (where == WHERE_END);
69 * Return the length of the string not including any final
70 * punctuation. E.g., the input "Signed-off-by:" would return
71 * 13, stripping the trailing punctuation but retaining
72 * internal punctuation.
74 static size_t token_len_without_separator(const char *token, size_t len)
76 while (len > 0 && !isalnum(token[len - 1]))
77 len--;
78 return len;
81 static int same_token(struct trailer_item *a, struct arg_item *b)
83 size_t a_len, b_len, min_len;
85 if (!a->token)
86 return 0;
88 a_len = token_len_without_separator(a->token, strlen(a->token));
89 b_len = token_len_without_separator(b->token, strlen(b->token));
90 min_len = (a_len > b_len) ? b_len : a_len;
92 return !strncasecmp(a->token, b->token, min_len);
95 static int same_value(struct trailer_item *a, struct arg_item *b)
97 return !strcasecmp(a->value, b->value);
100 static int same_trailer(struct trailer_item *a, struct arg_item *b)
102 return same_token(a, b) && same_value(a, b);
105 static inline int contains_only_spaces(const char *str)
107 const char *s = str;
108 while (*s && isspace(*s))
109 s++;
110 return !*s;
113 static inline void strbuf_replace(struct strbuf *sb, const char *a, const char *b)
115 const char *ptr = strstr(sb->buf, a);
116 if (ptr)
117 strbuf_splice(sb, ptr - sb->buf, strlen(a), b, strlen(b));
120 static void free_trailer_item(struct trailer_item *item)
122 free(item->token);
123 free(item->value);
124 free(item);
127 static void free_arg_item(struct arg_item *item)
129 free(item->conf.name);
130 free(item->conf.key);
131 free(item->conf.command);
132 free(item->token);
133 free(item->value);
134 free(item);
137 static char last_non_space_char(const char *s)
139 int i;
140 for (i = strlen(s) - 1; i >= 0; i--)
141 if (!isspace(s[i]))
142 return s[i];
143 return '\0';
146 static void print_tok_val(FILE *outfile, const char *tok, const char *val)
148 char c;
150 if (!tok) {
151 fprintf(outfile, "%s\n", val);
152 return;
155 c = last_non_space_char(tok);
156 if (!c)
157 return;
158 if (strchr(separators, c))
159 fprintf(outfile, "%s%s\n", tok, val);
160 else
161 fprintf(outfile, "%s%c %s\n", tok, separators[0], val);
164 static void print_all(FILE *outfile, struct list_head *head, int trim_empty)
166 struct list_head *pos;
167 struct trailer_item *item;
168 list_for_each(pos, head) {
169 item = list_entry(pos, struct trailer_item, list);
170 if (!trim_empty || strlen(item->value) > 0)
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 = xcalloc(sizeof(*new), 1);
178 new->token = arg_tok->token;
179 new->value = arg_tok->value;
180 arg_tok->token = arg_tok->value = NULL;
181 free_arg_item(arg_tok);
182 return new;
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 action_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;
303 static void apply_arg_if_missing(struct list_head *head,
304 struct arg_item *arg_tok)
306 enum action_where where;
307 struct trailer_item *to_add;
309 switch (arg_tok->conf.if_missing) {
310 case MISSING_DO_NOTHING:
311 free_arg_item(arg_tok);
312 break;
313 case MISSING_ADD:
314 where = arg_tok->conf.where;
315 apply_item_command(NULL, arg_tok);
316 to_add = trailer_from_arg(arg_tok);
317 if (after_or_end(where))
318 list_add_tail(&to_add->list, head);
319 else
320 list_add(&to_add->list, head);
324 static int find_same_and_apply_arg(struct list_head *head,
325 struct arg_item *arg_tok)
327 struct list_head *pos;
328 struct trailer_item *in_tok;
329 struct trailer_item *on_tok;
331 enum action_where where = arg_tok->conf.where;
332 int middle = (where == WHERE_AFTER) || (where == WHERE_BEFORE);
333 int backwards = after_or_end(where);
334 struct trailer_item *start_tok;
336 if (list_empty(head))
337 return 0;
339 start_tok = list_entry(backwards ? head->prev : head->next,
340 struct trailer_item,
341 list);
343 list_for_each_dir(pos, head, backwards) {
344 in_tok = list_entry(pos, struct trailer_item, list);
345 if (!same_token(in_tok, arg_tok))
346 continue;
347 on_tok = middle ? in_tok : start_tok;
348 apply_arg_if_exists(in_tok, arg_tok, on_tok, head);
349 return 1;
351 return 0;
354 static void process_trailers_lists(struct list_head *head,
355 struct list_head *arg_head)
357 struct list_head *pos, *p;
358 struct arg_item *arg_tok;
360 list_for_each_safe(pos, p, arg_head) {
361 int applied = 0;
362 arg_tok = list_entry(pos, struct arg_item, list);
364 list_del(pos);
366 applied = find_same_and_apply_arg(head, arg_tok);
368 if (!applied)
369 apply_arg_if_missing(head, arg_tok);
373 static int set_where(struct conf_info *item, const char *value)
375 if (!strcasecmp("after", value))
376 item->where = WHERE_AFTER;
377 else if (!strcasecmp("before", value))
378 item->where = WHERE_BEFORE;
379 else if (!strcasecmp("end", value))
380 item->where = WHERE_END;
381 else if (!strcasecmp("start", value))
382 item->where = WHERE_START;
383 else
384 return -1;
385 return 0;
388 static int set_if_exists(struct conf_info *item, const char *value)
390 if (!strcasecmp("addIfDifferent", value))
391 item->if_exists = EXISTS_ADD_IF_DIFFERENT;
392 else if (!strcasecmp("addIfDifferentNeighbor", value))
393 item->if_exists = EXISTS_ADD_IF_DIFFERENT_NEIGHBOR;
394 else if (!strcasecmp("add", value))
395 item->if_exists = EXISTS_ADD;
396 else if (!strcasecmp("replace", value))
397 item->if_exists = EXISTS_REPLACE;
398 else if (!strcasecmp("doNothing", value))
399 item->if_exists = EXISTS_DO_NOTHING;
400 else
401 return -1;
402 return 0;
405 static int set_if_missing(struct conf_info *item, const char *value)
407 if (!strcasecmp("doNothing", value))
408 item->if_missing = MISSING_DO_NOTHING;
409 else if (!strcasecmp("add", value))
410 item->if_missing = MISSING_ADD;
411 else
412 return -1;
413 return 0;
416 static void duplicate_conf(struct conf_info *dst, const struct conf_info *src)
418 *dst = *src;
419 dst->name = xstrdup_or_null(src->name);
420 dst->key = xstrdup_or_null(src->key);
421 dst->command = xstrdup_or_null(src->command);
424 static struct arg_item *get_conf_item(const char *name)
426 struct list_head *pos;
427 struct arg_item *item;
429 /* Look up item with same name */
430 list_for_each(pos, &conf_head) {
431 item = list_entry(pos, struct arg_item, list);
432 if (!strcasecmp(item->conf.name, name))
433 return item;
436 /* Item does not already exists, create it */
437 item = xcalloc(sizeof(*item), 1);
438 duplicate_conf(&item->conf, &default_conf_info);
439 item->conf.name = xstrdup(name);
441 list_add_tail(&item->list, &conf_head);
443 return item;
446 enum trailer_info_type { TRAILER_KEY, TRAILER_COMMAND, TRAILER_WHERE,
447 TRAILER_IF_EXISTS, TRAILER_IF_MISSING };
449 static struct {
450 const char *name;
451 enum trailer_info_type type;
452 } trailer_config_items[] = {
453 { "key", TRAILER_KEY },
454 { "command", TRAILER_COMMAND },
455 { "where", TRAILER_WHERE },
456 { "ifexists", TRAILER_IF_EXISTS },
457 { "ifmissing", TRAILER_IF_MISSING }
460 static int git_trailer_default_config(const char *conf_key, const char *value, void *cb)
462 const char *trailer_item, *variable_name;
464 if (!skip_prefix(conf_key, "trailer.", &trailer_item))
465 return 0;
467 variable_name = strrchr(trailer_item, '.');
468 if (!variable_name) {
469 if (!strcmp(trailer_item, "where")) {
470 if (set_where(&default_conf_info, value) < 0)
471 warning(_("unknown value '%s' for key '%s'"),
472 value, conf_key);
473 } else if (!strcmp(trailer_item, "ifexists")) {
474 if (set_if_exists(&default_conf_info, value) < 0)
475 warning(_("unknown value '%s' for key '%s'"),
476 value, conf_key);
477 } else if (!strcmp(trailer_item, "ifmissing")) {
478 if (set_if_missing(&default_conf_info, value) < 0)
479 warning(_("unknown value '%s' for key '%s'"),
480 value, conf_key);
481 } else if (!strcmp(trailer_item, "separators")) {
482 separators = xstrdup(value);
485 return 0;
488 static int git_trailer_config(const char *conf_key, const char *value, void *cb)
490 const char *trailer_item, *variable_name;
491 struct arg_item *item;
492 struct conf_info *conf;
493 char *name = NULL;
494 enum trailer_info_type type;
495 int i;
497 if (!skip_prefix(conf_key, "trailer.", &trailer_item))
498 return 0;
500 variable_name = strrchr(trailer_item, '.');
501 if (!variable_name)
502 return 0;
504 variable_name++;
505 for (i = 0; i < ARRAY_SIZE(trailer_config_items); i++) {
506 if (strcmp(trailer_config_items[i].name, variable_name))
507 continue;
508 name = xstrndup(trailer_item, variable_name - trailer_item - 1);
509 type = trailer_config_items[i].type;
510 break;
513 if (!name)
514 return 0;
516 item = get_conf_item(name);
517 conf = &item->conf;
518 free(name);
520 switch (type) {
521 case TRAILER_KEY:
522 if (conf->key)
523 warning(_("more than one %s"), conf_key);
524 conf->key = xstrdup(value);
525 break;
526 case TRAILER_COMMAND:
527 if (conf->command)
528 warning(_("more than one %s"), conf_key);
529 conf->command = xstrdup(value);
530 break;
531 case TRAILER_WHERE:
532 if (set_where(conf, value))
533 warning(_("unknown value '%s' for key '%s'"), value, conf_key);
534 break;
535 case TRAILER_IF_EXISTS:
536 if (set_if_exists(conf, value))
537 warning(_("unknown value '%s' for key '%s'"), value, conf_key);
538 break;
539 case TRAILER_IF_MISSING:
540 if (set_if_missing(conf, value))
541 warning(_("unknown value '%s' for key '%s'"), value, conf_key);
542 break;
543 default:
544 die("BUG: trailer.c: unhandled type %d", type);
546 return 0;
549 static const char *token_from_item(struct arg_item *item, char *tok)
551 if (item->conf.key)
552 return item->conf.key;
553 if (tok)
554 return tok;
555 return item->conf.name;
558 static int token_matches_item(const char *tok, struct arg_item *item, int tok_len)
560 if (!strncasecmp(tok, item->conf.name, tok_len))
561 return 1;
562 return item->conf.key ? !strncasecmp(tok, item->conf.key, tok_len) : 0;
566 * Return the location of the first separator in line, or -1 if there is no
567 * separator.
569 static int find_separator(const char *line, const char *separators)
571 int loc = strcspn(line, separators);
572 if (!line[loc])
573 return -1;
574 return loc;
578 * Obtain the token, value, and conf from the given trailer.
580 * separator_pos must not be 0, since the token cannot be an empty string.
582 * If separator_pos is -1, interpret the whole trailer as a token.
584 static void parse_trailer(struct strbuf *tok, struct strbuf *val,
585 const struct conf_info **conf, const char *trailer,
586 int separator_pos)
588 struct arg_item *item;
589 int tok_len;
590 struct list_head *pos;
592 if (separator_pos != -1) {
593 strbuf_add(tok, trailer, separator_pos);
594 strbuf_trim(tok);
595 strbuf_addstr(val, trailer + separator_pos + 1);
596 strbuf_trim(val);
597 } else {
598 strbuf_addstr(tok, trailer);
599 strbuf_trim(tok);
602 /* Lookup if the token matches something in the config */
603 tok_len = token_len_without_separator(tok->buf, tok->len);
604 if (conf)
605 *conf = &default_conf_info;
606 list_for_each(pos, &conf_head) {
607 item = list_entry(pos, struct arg_item, list);
608 if (token_matches_item(tok->buf, item, tok_len)) {
609 char *tok_buf = strbuf_detach(tok, NULL);
610 if (conf)
611 *conf = &item->conf;
612 strbuf_addstr(tok, token_from_item(item, tok_buf));
613 free(tok_buf);
614 break;
619 static struct trailer_item *add_trailer_item(struct list_head *head, char *tok,
620 char *val)
622 struct trailer_item *new = xcalloc(sizeof(*new), 1);
623 new->token = tok;
624 new->value = val;
625 list_add_tail(&new->list, head);
626 return new;
629 static void add_arg_item(struct list_head *arg_head, char *tok, char *val,
630 const struct conf_info *conf)
632 struct arg_item *new = xcalloc(sizeof(*new), 1);
633 new->token = tok;
634 new->value = val;
635 duplicate_conf(&new->conf, conf);
636 list_add_tail(&new->list, arg_head);
639 static void process_command_line_args(struct list_head *arg_head,
640 struct string_list *trailers)
642 struct string_list_item *tr;
643 struct arg_item *item;
644 struct strbuf tok = STRBUF_INIT;
645 struct strbuf val = STRBUF_INIT;
646 const struct conf_info *conf;
647 struct list_head *pos;
650 * In command-line arguments, '=' is accepted (in addition to the
651 * separators that are defined).
653 char *cl_separators = xstrfmt("=%s", separators);
655 /* Add an arg item for each configured trailer with a command */
656 list_for_each(pos, &conf_head) {
657 item = list_entry(pos, struct arg_item, list);
658 if (item->conf.command)
659 add_arg_item(arg_head,
660 xstrdup(token_from_item(item, NULL)),
661 xstrdup(""),
662 &item->conf);
665 /* Add an arg item for each trailer on the command line */
666 for_each_string_list_item(tr, trailers) {
667 int separator_pos = find_separator(tr->string, cl_separators);
668 if (separator_pos == 0) {
669 struct strbuf sb = STRBUF_INIT;
670 strbuf_addstr(&sb, tr->string);
671 strbuf_trim(&sb);
672 error(_("empty trailer token in trailer '%.*s'"),
673 (int) sb.len, sb.buf);
674 strbuf_release(&sb);
675 } else {
676 parse_trailer(&tok, &val, &conf, tr->string,
677 separator_pos);
678 add_arg_item(arg_head,
679 strbuf_detach(&tok, NULL),
680 strbuf_detach(&val, NULL),
681 conf);
685 free(cl_separators);
688 static struct strbuf **read_input_file(const char *file)
690 struct strbuf **lines;
691 struct strbuf sb = STRBUF_INIT;
693 if (file) {
694 if (strbuf_read_file(&sb, file, 0) < 0)
695 die_errno(_("could not read input file '%s'"), file);
696 } else {
697 if (strbuf_read(&sb, fileno(stdin), 0) < 0)
698 die_errno(_("could not read from stdin"));
701 lines = strbuf_split(&sb, '\n');
703 strbuf_release(&sb);
705 return lines;
709 * Return the (0 based) index of the start of the patch or the line
710 * count if there is no patch in the message.
712 static int find_patch_start(struct strbuf **lines, int count)
714 int i;
716 /* Get the start of the patch part if any */
717 for (i = 0; i < count; i++) {
718 if (starts_with(lines[i]->buf, "---"))
719 return i;
722 return count;
726 * Return the (0 based) index of the first trailer line or count if
727 * there are no trailers. Trailers are searched only in the lines from
728 * index (count - 1) down to index 0.
730 static int find_trailer_start(struct strbuf **lines, int count)
732 int start, end_of_title, only_spaces = 1;
733 int recognized_prefix = 0, trailer_lines = 0, non_trailer_lines = 0;
735 * Number of possible continuation lines encountered. This will be
736 * reset to 0 if we encounter a trailer (since those lines are to be
737 * considered continuations of that trailer), and added to
738 * non_trailer_lines if we encounter a non-trailer (since those lines
739 * are to be considered non-trailers).
741 int possible_continuation_lines = 0;
743 /* The first paragraph is the title and cannot be trailers */
744 for (start = 0; start < count; start++) {
745 if (lines[start]->buf[0] == comment_line_char)
746 continue;
747 if (contains_only_spaces(lines[start]->buf))
748 break;
750 end_of_title = start;
753 * Get the start of the trailers by looking starting from the end for a
754 * blank line before a set of non-blank lines that (i) are all
755 * trailers, or (ii) contains at least one Git-generated trailer and
756 * consists of at least 25% trailers.
758 for (start = count - 1; start >= end_of_title; start--) {
759 const char **p;
760 int separator_pos;
762 if (lines[start]->buf[0] == comment_line_char) {
763 non_trailer_lines += possible_continuation_lines;
764 possible_continuation_lines = 0;
765 continue;
767 if (contains_only_spaces(lines[start]->buf)) {
768 if (only_spaces)
769 continue;
770 non_trailer_lines += possible_continuation_lines;
771 if (recognized_prefix &&
772 trailer_lines * 3 >= non_trailer_lines)
773 return start + 1;
774 if (trailer_lines && !non_trailer_lines)
775 return start + 1;
776 return count;
778 only_spaces = 0;
780 for (p = git_generated_prefixes; *p; p++) {
781 if (starts_with(lines[start]->buf, *p)) {
782 trailer_lines++;
783 possible_continuation_lines = 0;
784 recognized_prefix = 1;
785 goto continue_outer_loop;
789 separator_pos = find_separator(lines[start]->buf, separators);
790 if (separator_pos >= 1 && !isspace(lines[start]->buf[0])) {
791 struct list_head *pos;
793 trailer_lines++;
794 possible_continuation_lines = 0;
795 if (recognized_prefix)
796 continue;
797 list_for_each(pos, &conf_head) {
798 struct arg_item *item;
799 item = list_entry(pos, struct arg_item, list);
800 if (token_matches_item(lines[start]->buf, item,
801 separator_pos)) {
802 recognized_prefix = 1;
803 break;
806 } else if (isspace(lines[start]->buf[0]))
807 possible_continuation_lines++;
808 else {
809 non_trailer_lines++;
810 non_trailer_lines += possible_continuation_lines;
811 possible_continuation_lines = 0;
813 continue_outer_loop:
817 return count;
820 /* Get the index of the end of the trailers */
821 static int find_trailer_end(struct strbuf **lines, int patch_start)
823 struct strbuf sb = STRBUF_INIT;
824 int i, ignore_bytes;
826 for (i = 0; i < patch_start; i++)
827 strbuf_addbuf(&sb, lines[i]);
828 ignore_bytes = ignore_non_trailer(&sb);
829 strbuf_release(&sb);
830 for (i = patch_start - 1; i >= 0 && ignore_bytes > 0; i--)
831 ignore_bytes -= lines[i]->len;
833 return i + 1;
836 static int has_blank_line_before(struct strbuf **lines, int start)
838 for (;start >= 0; start--) {
839 if (lines[start]->buf[0] == comment_line_char)
840 continue;
841 return contains_only_spaces(lines[start]->buf);
843 return 0;
846 static void print_lines(FILE *outfile, struct strbuf **lines, int start, int end)
848 int i;
849 for (i = start; lines[i] && i < end; i++)
850 fprintf(outfile, "%s", lines[i]->buf);
853 static int process_input_file(FILE *outfile,
854 struct strbuf **lines,
855 struct list_head *head)
857 int count = 0;
858 int patch_start, trailer_start, trailer_end, i;
859 struct strbuf tok = STRBUF_INIT;
860 struct strbuf val = STRBUF_INIT;
861 struct trailer_item *last = NULL;
863 /* Get the line count */
864 while (lines[count])
865 count++;
867 patch_start = find_patch_start(lines, count);
868 trailer_end = find_trailer_end(lines, patch_start);
869 trailer_start = find_trailer_start(lines, trailer_end);
871 /* Print lines before the trailers as is */
872 print_lines(outfile, lines, 0, trailer_start);
874 if (!has_blank_line_before(lines, trailer_start - 1))
875 fprintf(outfile, "\n");
877 /* Parse trailer lines */
878 for (i = trailer_start; i < trailer_end; i++) {
879 int separator_pos;
880 if (lines[i]->buf[0] == comment_line_char)
881 continue;
882 if (last && isspace(lines[i]->buf[0])) {
883 struct strbuf sb = STRBUF_INIT;
884 strbuf_addf(&sb, "%s\n%s", last->value, lines[i]->buf);
885 strbuf_strip_suffix(&sb, "\n");
886 free(last->value);
887 last->value = strbuf_detach(&sb, NULL);
888 continue;
890 separator_pos = find_separator(lines[i]->buf, separators);
891 if (separator_pos >= 1) {
892 parse_trailer(&tok, &val, NULL, lines[i]->buf,
893 separator_pos);
894 last = add_trailer_item(head,
895 strbuf_detach(&tok, NULL),
896 strbuf_detach(&val, NULL));
897 } else {
898 strbuf_addbuf(&val, lines[i]);
899 strbuf_strip_suffix(&val, "\n");
900 add_trailer_item(head,
901 NULL,
902 strbuf_detach(&val, NULL));
903 last = NULL;
907 return trailer_end;
910 static void free_all(struct list_head *head)
912 struct list_head *pos, *p;
913 list_for_each_safe(pos, p, head) {
914 list_del(pos);
915 free_trailer_item(list_entry(pos, struct trailer_item, list));
919 static struct tempfile trailers_tempfile;
921 static FILE *create_in_place_tempfile(const char *file)
923 struct stat st;
924 struct strbuf template = STRBUF_INIT;
925 const char *tail;
926 FILE *outfile;
928 if (stat(file, &st))
929 die_errno(_("could not stat %s"), file);
930 if (!S_ISREG(st.st_mode))
931 die(_("file %s is not a regular file"), file);
932 if (!(st.st_mode & S_IWUSR))
933 die(_("file %s is not writable by user"), file);
935 /* Create temporary file in the same directory as the original */
936 tail = strrchr(file, '/');
937 if (tail != NULL)
938 strbuf_add(&template, file, tail - file + 1);
939 strbuf_addstr(&template, "git-interpret-trailers-XXXXXX");
941 xmks_tempfile_m(&trailers_tempfile, template.buf, st.st_mode);
942 strbuf_release(&template);
943 outfile = fdopen_tempfile(&trailers_tempfile, "w");
944 if (!outfile)
945 die_errno(_("could not open temporary file"));
947 return outfile;
950 void process_trailers(const char *file, int in_place, int trim_empty, struct string_list *trailers)
952 LIST_HEAD(head);
953 LIST_HEAD(arg_head);
954 struct strbuf **lines;
955 int trailer_end;
956 FILE *outfile = stdout;
958 /* Default config must be setup first */
959 git_config(git_trailer_default_config, NULL);
960 git_config(git_trailer_config, NULL);
962 lines = read_input_file(file);
964 if (in_place)
965 outfile = create_in_place_tempfile(file);
967 /* Print the lines before the trailers */
968 trailer_end = process_input_file(outfile, lines, &head);
970 process_command_line_args(&arg_head, trailers);
972 process_trailers_lists(&head, &arg_head);
974 print_all(outfile, &head, trim_empty);
976 free_all(&head);
978 /* Print the lines after the trailers as is */
979 print_lines(outfile, lines, trailer_end, INT_MAX);
981 if (in_place)
982 if (rename_tempfile(&trailers_tempfile, file))
983 die_errno(_("could not rename temporary file to %s"), file);
985 strbuf_list_free(lines);