1#include "cache.h"
2#include "string-list.h"
3#include "run-command.h"
4#include "string-list.h"
5#include "trailer.h"
6/*
7 * Copyright (c) 2013, 2014 Christian Couder <chriscool@tuxfamily.org>
8 */
9
10enum action_where { WHERE_END, WHERE_AFTER, WHERE_BEFORE, WHERE_START };
11enum action_if_exists { EXISTS_ADD_IF_DIFFERENT_NEIGHBOR, EXISTS_ADD_IF_DIFFERENT,
12 EXISTS_ADD, EXISTS_REPLACE, EXISTS_DO_NOTHING };
13enum action_if_missing { MISSING_ADD, MISSING_DO_NOTHING };
14
15struct conf_info {
16 char *name;
17 char *key;
18 char *command;
19 enum action_where where;
20 enum action_if_exists if_exists;
21 enum action_if_missing if_missing;
22};
23
24static struct conf_info default_conf_info;
25
26struct trailer_item {
27 struct trailer_item *previous;
28 struct trailer_item *next;
29 const char *token;
30 const char *value;
31 struct conf_info conf;
32};
33
34static struct trailer_item *first_conf_item;
35
36static char *separators = ":";
37
38#define TRAILER_ARG_STRING "$ARG"
39
40static int after_or_end(enum action_where where)
41{
42 return (where == WHERE_AFTER) || (where == WHERE_END);
43}
44
45/*
46 * Return the length of the string not including any final
47 * punctuation. E.g., the input "Signed-off-by:" would return
48 * 13, stripping the trailing punctuation but retaining
49 * internal punctuation.
50 */
51static size_t token_len_without_separator(const char *token, size_t len)
52{
53 while (len > 0 && !isalnum(token[len - 1]))
54 len--;
55 return len;
56}
57
58static int same_token(struct trailer_item *a, struct trailer_item *b)
59{
60 size_t a_len = token_len_without_separator(a->token, strlen(a->token));
61 size_t b_len = token_len_without_separator(b->token, strlen(b->token));
62 size_t min_len = (a_len > b_len) ? b_len : a_len;
63
64 return !strncasecmp(a->token, b->token, min_len);
65}
66
67static int same_value(struct trailer_item *a, struct trailer_item *b)
68{
69 return !strcasecmp(a->value, b->value);
70}
71
72static int same_trailer(struct trailer_item *a, struct trailer_item *b)
73{
74 return same_token(a, b) && same_value(a, b);
75}
76
77static inline int contains_only_spaces(const char *str)
78{
79 const char *s = str;
80 while (*s && isspace(*s))
81 s++;
82 return !*s;
83}
84
85static inline void strbuf_replace(struct strbuf *sb, const char *a, const char *b)
86{
87 const char *ptr = strstr(sb->buf, a);
88 if (ptr)
89 strbuf_splice(sb, ptr - sb->buf, strlen(a), b, strlen(b));
90}
91
92static void free_trailer_item(struct trailer_item *item)
93{
94 free(item->conf.name);
95 free(item->conf.key);
96 free(item->conf.command);
97 free((char *)item->token);
98 free((char *)item->value);
99 free(item);
100}
101
102static char last_non_space_char(const char *s)
103{
104 int i;
105 for (i = strlen(s) - 1; i >= 0; i--)
106 if (!isspace(s[i]))
107 return s[i];
108 return '\0';
109}
110
111static void print_tok_val(const char *tok, const char *val)
112{
113 char c = last_non_space_char(tok);
114 if (!c)
115 return;
116 if (strchr(separators, c))
117 printf("%s%s\n", tok, val);
118 else
119 printf("%s%c %s\n", tok, separators[0], val);
120}
121
122static void print_all(struct trailer_item *first, int trim_empty)
123{
124 struct trailer_item *item;
125 for (item = first; item; item = item->next) {
126 if (!trim_empty || strlen(item->value) > 0)
127 print_tok_val(item->token, item->value);
128 }
129}
130
131static void update_last(struct trailer_item **last)
132{
133 if (*last)
134 while ((*last)->next != NULL)
135 *last = (*last)->next;
136}
137
138static void update_first(struct trailer_item **first)
139{
140 if (*first)
141 while ((*first)->previous != NULL)
142 *first = (*first)->previous;
143}
144
145static void add_arg_to_input_list(struct trailer_item *on_tok,
146 struct trailer_item *arg_tok,
147 struct trailer_item **first,
148 struct trailer_item **last)
149{
150 if (after_or_end(arg_tok->conf.where)) {
151 arg_tok->next = on_tok->next;
152 on_tok->next = arg_tok;
153 arg_tok->previous = on_tok;
154 if (arg_tok->next)
155 arg_tok->next->previous = arg_tok;
156 update_last(last);
157 } else {
158 arg_tok->previous = on_tok->previous;
159 on_tok->previous = arg_tok;
160 arg_tok->next = on_tok;
161 if (arg_tok->previous)
162 arg_tok->previous->next = arg_tok;
163 update_first(first);
164 }
165}
166
167static int check_if_different(struct trailer_item *in_tok,
168 struct trailer_item *arg_tok,
169 int check_all)
170{
171 enum action_where where = arg_tok->conf.where;
172 do {
173 if (!in_tok)
174 return 1;
175 if (same_trailer(in_tok, arg_tok))
176 return 0;
177 /*
178 * if we want to add a trailer after another one,
179 * we have to check those before this one
180 */
181 in_tok = after_or_end(where) ? in_tok->previous : in_tok->next;
182 } while (check_all);
183 return 1;
184}
185
186static void remove_from_list(struct trailer_item *item,
187 struct trailer_item **first,
188 struct trailer_item **last)
189{
190 struct trailer_item *next = item->next;
191 struct trailer_item *previous = item->previous;
192
193 if (next) {
194 item->next->previous = previous;
195 item->next = NULL;
196 } else if (last)
197 *last = previous;
198
199 if (previous) {
200 item->previous->next = next;
201 item->previous = NULL;
202 } else if (first)
203 *first = next;
204}
205
206static struct trailer_item *remove_first(struct trailer_item **first)
207{
208 struct trailer_item *item = *first;
209 *first = item->next;
210 if (item->next) {
211 item->next->previous = NULL;
212 item->next = NULL;
213 }
214 return item;
215}
216
217static int read_from_command(struct child_process *cp, struct strbuf *buf)
218{
219 if (run_command(cp))
220 return error("running trailer command '%s' failed", cp->argv[0]);
221 if (strbuf_read(buf, cp->out, 1024) < 1)
222 return error("reading from trailer command '%s' failed", cp->argv[0]);
223 strbuf_trim(buf);
224 return 0;
225}
226
227static const char *apply_command(const char *command, const char *arg)
228{
229 struct strbuf cmd = STRBUF_INIT;
230 struct strbuf buf = STRBUF_INIT;
231 struct child_process cp;
232 const char *argv[] = {NULL, NULL};
233 const char *result;
234
235 strbuf_addstr(&cmd, command);
236 if (arg)
237 strbuf_replace(&cmd, TRAILER_ARG_STRING, arg);
238
239 argv[0] = cmd.buf;
240 memset(&cp, 0, sizeof(cp));
241 cp.argv = argv;
242 cp.env = local_repo_env;
243 cp.no_stdin = 1;
244 cp.out = -1;
245 cp.use_shell = 1;
246
247 if (read_from_command(&cp, &buf)) {
248 strbuf_release(&buf);
249 result = xstrdup("");
250 } else
251 result = strbuf_detach(&buf, NULL);
252
253 strbuf_release(&cmd);
254 return result;
255}
256
257static void apply_item_command(struct trailer_item *in_tok, struct trailer_item *arg_tok)
258{
259 if (arg_tok->conf.command) {
260 const char *arg;
261 if (arg_tok->value && arg_tok->value[0]) {
262 arg = arg_tok->value;
263 } else {
264 if (in_tok && in_tok->value)
265 arg = xstrdup(in_tok->value);
266 else
267 arg = xstrdup("");
268 }
269 arg_tok->value = apply_command(arg_tok->conf.command, arg);
270 free((char *)arg);
271 }
272}
273
274static void apply_arg_if_exists(struct trailer_item *in_tok,
275 struct trailer_item *arg_tok,
276 struct trailer_item *on_tok,
277 struct trailer_item **in_tok_first,
278 struct trailer_item **in_tok_last)
279{
280 switch (arg_tok->conf.if_exists) {
281 case EXISTS_DO_NOTHING:
282 free_trailer_item(arg_tok);
283 break;
284 case EXISTS_REPLACE:
285 apply_item_command(in_tok, arg_tok);
286 add_arg_to_input_list(on_tok, arg_tok,
287 in_tok_first, in_tok_last);
288 remove_from_list(in_tok, in_tok_first, in_tok_last);
289 free_trailer_item(in_tok);
290 break;
291 case EXISTS_ADD:
292 apply_item_command(in_tok, arg_tok);
293 add_arg_to_input_list(on_tok, arg_tok,
294 in_tok_first, in_tok_last);
295 break;
296 case EXISTS_ADD_IF_DIFFERENT:
297 apply_item_command(in_tok, arg_tok);
298 if (check_if_different(in_tok, arg_tok, 1))
299 add_arg_to_input_list(on_tok, arg_tok,
300 in_tok_first, in_tok_last);
301 else
302 free_trailer_item(arg_tok);
303 break;
304 case EXISTS_ADD_IF_DIFFERENT_NEIGHBOR:
305 apply_item_command(in_tok, arg_tok);
306 if (check_if_different(on_tok, arg_tok, 0))
307 add_arg_to_input_list(on_tok, arg_tok,
308 in_tok_first, in_tok_last);
309 else
310 free_trailer_item(arg_tok);
311 break;
312 }
313}
314
315static void apply_arg_if_missing(struct trailer_item **in_tok_first,
316 struct trailer_item **in_tok_last,
317 struct trailer_item *arg_tok)
318{
319 struct trailer_item **in_tok;
320 enum action_where where;
321
322 switch (arg_tok->conf.if_missing) {
323 case MISSING_DO_NOTHING:
324 free_trailer_item(arg_tok);
325 break;
326 case MISSING_ADD:
327 where = arg_tok->conf.where;
328 in_tok = after_or_end(where) ? in_tok_last : in_tok_first;
329 apply_item_command(NULL, arg_tok);
330 if (*in_tok) {
331 add_arg_to_input_list(*in_tok, arg_tok,
332 in_tok_first, in_tok_last);
333 } else {
334 *in_tok_first = arg_tok;
335 *in_tok_last = arg_tok;
336 }
337 break;
338 }
339}
340
341static int find_same_and_apply_arg(struct trailer_item **in_tok_first,
342 struct trailer_item **in_tok_last,
343 struct trailer_item *arg_tok)
344{
345 struct trailer_item *in_tok;
346 struct trailer_item *on_tok;
347 struct trailer_item *following_tok;
348
349 enum action_where where = arg_tok->conf.where;
350 int middle = (where == WHERE_AFTER) || (where == WHERE_BEFORE);
351 int backwards = after_or_end(where);
352 struct trailer_item *start_tok = backwards ? *in_tok_last : *in_tok_first;
353
354 for (in_tok = start_tok; in_tok; in_tok = following_tok) {
355 following_tok = backwards ? in_tok->previous : in_tok->next;
356 if (!same_token(in_tok, arg_tok))
357 continue;
358 on_tok = middle ? in_tok : start_tok;
359 apply_arg_if_exists(in_tok, arg_tok, on_tok,
360 in_tok_first, in_tok_last);
361 return 1;
362 }
363 return 0;
364}
365
366static void process_trailers_lists(struct trailer_item **in_tok_first,
367 struct trailer_item **in_tok_last,
368 struct trailer_item **arg_tok_first)
369{
370 struct trailer_item *arg_tok;
371 struct trailer_item *next_arg;
372
373 if (!*arg_tok_first)
374 return;
375
376 for (arg_tok = *arg_tok_first; arg_tok; arg_tok = next_arg) {
377 int applied = 0;
378
379 next_arg = arg_tok->next;
380 remove_from_list(arg_tok, arg_tok_first, NULL);
381
382 applied = find_same_and_apply_arg(in_tok_first,
383 in_tok_last,
384 arg_tok);
385
386 if (!applied)
387 apply_arg_if_missing(in_tok_first,
388 in_tok_last,
389 arg_tok);
390 }
391}
392
393static int set_where(struct conf_info *item, const char *value)
394{
395 if (!strcasecmp("after", value))
396 item->where = WHERE_AFTER;
397 else if (!strcasecmp("before", value))
398 item->where = WHERE_BEFORE;
399 else if (!strcasecmp("end", value))
400 item->where = WHERE_END;
401 else if (!strcasecmp("start", value))
402 item->where = WHERE_START;
403 else
404 return -1;
405 return 0;
406}
407
408static int set_if_exists(struct conf_info *item, const char *value)
409{
410 if (!strcasecmp("addIfDifferent", value))
411 item->if_exists = EXISTS_ADD_IF_DIFFERENT;
412 else if (!strcasecmp("addIfDifferentNeighbor", value))
413 item->if_exists = EXISTS_ADD_IF_DIFFERENT_NEIGHBOR;
414 else if (!strcasecmp("add", value))
415 item->if_exists = EXISTS_ADD;
416 else if (!strcasecmp("replace", value))
417 item->if_exists = EXISTS_REPLACE;
418 else if (!strcasecmp("doNothing", value))
419 item->if_exists = EXISTS_DO_NOTHING;
420 else
421 return -1;
422 return 0;
423}
424
425static int set_if_missing(struct conf_info *item, const char *value)
426{
427 if (!strcasecmp("doNothing", value))
428 item->if_missing = MISSING_DO_NOTHING;
429 else if (!strcasecmp("add", value))
430 item->if_missing = MISSING_ADD;
431 else
432 return -1;
433 return 0;
434}
435
436static void duplicate_conf(struct conf_info *dst, struct conf_info *src)
437{
438 *dst = *src;
439 if (src->name)
440 dst->name = xstrdup(src->name);
441 if (src->key)
442 dst->key = xstrdup(src->key);
443 if (src->command)
444 dst->command = xstrdup(src->command);
445}
446
447static struct trailer_item *get_conf_item(const char *name)
448{
449 struct trailer_item *item;
450 struct trailer_item *previous;
451
452 /* Look up item with same name */
453 for (previous = NULL, item = first_conf_item;
454 item;
455 previous = item, item = item->next) {
456 if (!strcasecmp(item->conf.name, name))
457 return item;
458 }
459
460 /* Item does not already exists, create it */
461 item = xcalloc(sizeof(struct trailer_item), 1);
462 duplicate_conf(&item->conf, &default_conf_info);
463 item->conf.name = xstrdup(name);
464
465 if (!previous)
466 first_conf_item = item;
467 else {
468 previous->next = item;
469 item->previous = previous;
470 }
471
472 return item;
473}
474
475enum trailer_info_type { TRAILER_KEY, TRAILER_COMMAND, TRAILER_WHERE,
476 TRAILER_IF_EXISTS, TRAILER_IF_MISSING };
477
478static struct {
479 const char *name;
480 enum trailer_info_type type;
481} trailer_config_items[] = {
482 { "key", TRAILER_KEY },
483 { "command", TRAILER_COMMAND },
484 { "where", TRAILER_WHERE },
485 { "ifexists", TRAILER_IF_EXISTS },
486 { "ifmissing", TRAILER_IF_MISSING }
487};
488
489static int git_trailer_default_config(const char *conf_key, const char *value, void *cb)
490{
491 const char *trailer_item, *variable_name;
492
493 if (!skip_prefix(conf_key, "trailer.", &trailer_item))
494 return 0;
495
496 variable_name = strrchr(trailer_item, '.');
497 if (!variable_name) {
498 if (!strcmp(trailer_item, "where")) {
499 if (set_where(&default_conf_info, value) < 0)
500 warning(_("unknown value '%s' for key '%s'"),
501 value, conf_key);
502 } else if (!strcmp(trailer_item, "ifexists")) {
503 if (set_if_exists(&default_conf_info, value) < 0)
504 warning(_("unknown value '%s' for key '%s'"),
505 value, conf_key);
506 } else if (!strcmp(trailer_item, "ifmissing")) {
507 if (set_if_missing(&default_conf_info, value) < 0)
508 warning(_("unknown value '%s' for key '%s'"),
509 value, conf_key);
510 } else if (!strcmp(trailer_item, "separators")) {
511 separators = xstrdup(value);
512 }
513 }
514 return 0;
515}
516
517static int git_trailer_config(const char *conf_key, const char *value, void *cb)
518{
519 const char *trailer_item, *variable_name;
520 struct trailer_item *item;
521 struct conf_info *conf;
522 char *name = NULL;
523 enum trailer_info_type type;
524 int i;
525
526 if (!skip_prefix(conf_key, "trailer.", &trailer_item))
527 return 0;
528
529 variable_name = strrchr(trailer_item, '.');
530 if (!variable_name)
531 return 0;
532
533 variable_name++;
534 for (i = 0; i < ARRAY_SIZE(trailer_config_items); i++) {
535 if (strcmp(trailer_config_items[i].name, variable_name))
536 continue;
537 name = xstrndup(trailer_item, variable_name - trailer_item - 1);
538 type = trailer_config_items[i].type;
539 break;
540 }
541
542 if (!name)
543 return 0;
544
545 item = get_conf_item(name);
546 conf = &item->conf;
547 free(name);
548
549 switch (type) {
550 case TRAILER_KEY:
551 if (conf->key)
552 warning(_("more than one %s"), conf_key);
553 conf->key = xstrdup(value);
554 break;
555 case TRAILER_COMMAND:
556 if (conf->command)
557 warning(_("more than one %s"), conf_key);
558 conf->command = xstrdup(value);
559 break;
560 case TRAILER_WHERE:
561 if (set_where(conf, value))
562 warning(_("unknown value '%s' for key '%s'"), value, conf_key);
563 break;
564 case TRAILER_IF_EXISTS:
565 if (set_if_exists(conf, value))
566 warning(_("unknown value '%s' for key '%s'"), value, conf_key);
567 break;
568 case TRAILER_IF_MISSING:
569 if (set_if_missing(conf, value))
570 warning(_("unknown value '%s' for key '%s'"), value, conf_key);
571 break;
572 default:
573 die("internal bug in trailer.c");
574 }
575 return 0;
576}
577
578static int parse_trailer(struct strbuf *tok, struct strbuf *val, const char *trailer)
579{
580 size_t len;
581 struct strbuf seps = STRBUF_INIT;
582 strbuf_addstr(&seps, separators);
583 strbuf_addch(&seps, '=');
584 len = strcspn(trailer, seps.buf);
585 strbuf_release(&seps);
586 if (len == 0)
587 return error(_("empty trailer token in trailer '%s'"), trailer);
588 if (len < strlen(trailer)) {
589 strbuf_add(tok, trailer, len);
590 strbuf_trim(tok);
591 strbuf_addstr(val, trailer + len + 1);
592 strbuf_trim(val);
593 } else {
594 strbuf_addstr(tok, trailer);
595 strbuf_trim(tok);
596 }
597 return 0;
598}
599
600static const char *token_from_item(struct trailer_item *item, char *tok)
601{
602 if (item->conf.key)
603 return item->conf.key;
604 if (tok)
605 return tok;
606 return item->conf.name;
607}
608
609static struct trailer_item *new_trailer_item(struct trailer_item *conf_item,
610 char *tok, char *val)
611{
612 struct trailer_item *new = xcalloc(sizeof(*new), 1);
613 new->value = val ? val : xstrdup("");
614
615 if (conf_item) {
616 duplicate_conf(&new->conf, &conf_item->conf);
617 new->token = xstrdup(token_from_item(conf_item, tok));
618 free(tok);
619 } else {
620 duplicate_conf(&new->conf, &default_conf_info);
621 new->token = tok;
622 }
623
624 return new;
625}
626
627static int token_matches_item(const char *tok, struct trailer_item *item, int tok_len)
628{
629 if (!strncasecmp(tok, item->conf.name, tok_len))
630 return 1;
631 return item->conf.key ? !strncasecmp(tok, item->conf.key, tok_len) : 0;
632}
633
634static struct trailer_item *create_trailer_item(const char *string)
635{
636 struct strbuf tok = STRBUF_INIT;
637 struct strbuf val = STRBUF_INIT;
638 struct trailer_item *item;
639 int tok_len;
640
641 if (parse_trailer(&tok, &val, string))
642 return NULL;
643
644 tok_len = token_len_without_separator(tok.buf, tok.len);
645
646 /* Lookup if the token matches something in the config */
647 for (item = first_conf_item; item; item = item->next) {
648 if (token_matches_item(tok.buf, item, tok_len))
649 return new_trailer_item(item,
650 strbuf_detach(&tok, NULL),
651 strbuf_detach(&val, NULL));
652 }
653
654 return new_trailer_item(NULL,
655 strbuf_detach(&tok, NULL),
656 strbuf_detach(&val, NULL));
657}
658
659static void add_trailer_item(struct trailer_item **first,
660 struct trailer_item **last,
661 struct trailer_item *new)
662{
663 if (!new)
664 return;
665 if (!*last) {
666 *first = new;
667 *last = new;
668 } else {
669 (*last)->next = new;
670 new->previous = *last;
671 *last = new;
672 }
673}
674
675static struct trailer_item *process_command_line_args(struct string_list *trailers)
676{
677 struct trailer_item *arg_tok_first = NULL;
678 struct trailer_item *arg_tok_last = NULL;
679 struct string_list_item *tr;
680 struct trailer_item *item;
681
682 /* Add a trailer item for each configured trailer with a command */
683 for (item = first_conf_item; item; item = item->next) {
684 if (item->conf.command) {
685 struct trailer_item *new = new_trailer_item(item, NULL, NULL);
686 add_trailer_item(&arg_tok_first, &arg_tok_last, new);
687 }
688 }
689
690 /* Add a trailer item for each trailer on the command line */
691 for_each_string_list_item(tr, trailers) {
692 struct trailer_item *new = create_trailer_item(tr->string);
693 add_trailer_item(&arg_tok_first, &arg_tok_last, new);
694 }
695
696 return arg_tok_first;
697}
698
699static struct strbuf **read_input_file(const char *file)
700{
701 struct strbuf **lines;
702 struct strbuf sb = STRBUF_INIT;
703
704 if (file) {
705 if (strbuf_read_file(&sb, file, 0) < 0)
706 die_errno(_("could not read input file '%s'"), file);
707 } else {
708 if (strbuf_read(&sb, fileno(stdin), 0) < 0)
709 die_errno(_("could not read from stdin"));
710 }
711
712 lines = strbuf_split(&sb, '\n');
713
714 strbuf_release(&sb);
715
716 return lines;
717}
718
719/*
720 * Return the (0 based) index of the start of the patch or the line
721 * count if there is no patch in the message.
722 */
723static int find_patch_start(struct strbuf **lines, int count)
724{
725 int i;
726
727 /* Get the start of the patch part if any */
728 for (i = 0; i < count; i++) {
729 if (starts_with(lines[i]->buf, "---"))
730 return i;
731 }
732
733 return count;
734}
735
736/*
737 * Return the (0 based) index of the first trailer line or count if
738 * there are no trailers. Trailers are searched only in the lines from
739 * index (count - 1) down to index 0.
740 */
741static int find_trailer_start(struct strbuf **lines, int count)
742{
743 int start, only_spaces = 1;
744
745 /*
746 * Get the start of the trailers by looking starting from the end
747 * for a line with only spaces before lines with one separator.
748 */
749 for (start = count - 1; start >= 0; start--) {
750 if (lines[start]->buf[0] == comment_line_char)
751 continue;
752 if (contains_only_spaces(lines[start]->buf)) {
753 if (only_spaces)
754 continue;
755 return start + 1;
756 }
757 if (strcspn(lines[start]->buf, separators) < lines[start]->len) {
758 if (only_spaces)
759 only_spaces = 0;
760 continue;
761 }
762 return count;
763 }
764
765 return only_spaces ? count : 0;
766}
767
768static int has_blank_line_before(struct strbuf **lines, int start)
769{
770 for (;start >= 0; start--) {
771 if (lines[start]->buf[0] == comment_line_char)
772 continue;
773 return contains_only_spaces(lines[start]->buf);
774 }
775 return 0;
776}
777
778static void print_lines(struct strbuf **lines, int start, int end)
779{
780 int i;
781 for (i = start; lines[i] && i < end; i++)
782 printf("%s", lines[i]->buf);
783}
784
785static int process_input_file(struct strbuf **lines,
786 struct trailer_item **in_tok_first,
787 struct trailer_item **in_tok_last)
788{
789 int count = 0;
790 int patch_start, trailer_start, i;
791
792 /* Get the line count */
793 while (lines[count])
794 count++;
795
796 patch_start = find_patch_start(lines, count);
797 trailer_start = find_trailer_start(lines, patch_start);
798
799 /* Print lines before the trailers as is */
800 print_lines(lines, 0, trailer_start);
801
802 if (!has_blank_line_before(lines, trailer_start - 1))
803 printf("\n");
804
805 /* Parse trailer lines */
806 for (i = trailer_start; i < patch_start; i++) {
807 if (lines[i]->buf[0] != comment_line_char) {
808 struct trailer_item *new = create_trailer_item(lines[i]->buf);
809 add_trailer_item(in_tok_first, in_tok_last, new);
810 }
811 }
812
813 return patch_start;
814}
815
816static void free_all(struct trailer_item **first)
817{
818 while (*first) {
819 struct trailer_item *item = remove_first(first);
820 free_trailer_item(item);
821 }
822}
823
824void process_trailers(const char *file, int trim_empty, struct string_list *trailers)
825{
826 struct trailer_item *in_tok_first = NULL;
827 struct trailer_item *in_tok_last = NULL;
828 struct trailer_item *arg_tok_first;
829 struct strbuf **lines;
830 int patch_start;
831
832 /* Default config must be setup first */
833 git_config(git_trailer_default_config, NULL);
834 git_config(git_trailer_config, NULL);
835
836 lines = read_input_file(file);
837
838 /* Print the lines before the trailers */
839 patch_start = process_input_file(lines, &in_tok_first, &in_tok_last);
840
841 arg_tok_first = process_command_line_args(trailers);
842
843 process_trailers_lists(&in_tok_first, &in_tok_last, &arg_tok_first);
844
845 print_all(in_tok_first, trim_empty);
846
847 free_all(&in_tok_first);
848
849 /* Print the lines after the trailers as is */
850 print_lines(lines, patch_start, INT_MAX);
851
852 strbuf_list_free(lines);
853}