trailer: allow to write to files other than stdout
[git/git.git] / trailer.c
CommitLineData
9385b5d7 1#include "cache.h"
f0a90b4e 2#include "string-list.h"
85039fb6 3#include "run-command.h"
61cfef4c 4#include "commit.h"
b1d78d77 5#include "trailer.h"
9385b5d7
CC
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
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38#define TRAILER_ARG_STRING "$ARG"
39
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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}
4103818d 76
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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
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CC
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
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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
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CC
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
d0d2344a 111static void print_tok_val(FILE *outfile, const char *tok, const char *val)
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CC
112{
113 char c = last_non_space_char(tok);
114 if (!c)
115 return;
116 if (strchr(separators, c))
d0d2344a 117 fprintf(outfile, "%s%s\n", tok, val);
b1d78d77 118 else
d0d2344a 119 fprintf(outfile, "%s%c %s\n", tok, separators[0], val);
b1d78d77
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120}
121
d0d2344a 122static void print_all(FILE *outfile, struct trailer_item *first, int trim_empty)
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CC
123{
124 struct trailer_item *item;
125 for (item = first; item; item = item->next) {
126 if (!trim_empty || strlen(item->value) > 0)
d0d2344a 127 print_tok_val(outfile, item->token, item->value);
b1d78d77
CC
128 }
129}
130
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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
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217static const char *apply_command(const char *command, const char *arg)
218{
219 struct strbuf cmd = STRBUF_INIT;
220 struct strbuf buf = STRBUF_INIT;
b226293b 221 struct child_process cp = CHILD_PROCESS_INIT;
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222 const char *argv[] = {NULL, NULL};
223 const char *result;
224
225 strbuf_addstr(&cmd, command);
226 if (arg)
227 strbuf_replace(&cmd, TRAILER_ARG_STRING, arg);
228
229 argv[0] = cmd.buf;
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230 cp.argv = argv;
231 cp.env = local_repo_env;
232 cp.no_stdin = 1;
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233 cp.use_shell = 1;
234
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JK
235 if (capture_command(&cp, &buf, 1024)) {
236 error("running trailer command '%s' failed", cmd.buf);
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237 strbuf_release(&buf);
238 result = xstrdup("");
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239 } else {
240 strbuf_trim(&buf);
85039fb6 241 result = strbuf_detach(&buf, NULL);
c5eadcaa 242 }
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243
244 strbuf_release(&cmd);
245 return result;
246}
247
248static void apply_item_command(struct trailer_item *in_tok, struct trailer_item *arg_tok)
249{
250 if (arg_tok->conf.command) {
251 const char *arg;
252 if (arg_tok->value && arg_tok->value[0]) {
253 arg = arg_tok->value;
254 } else {
255 if (in_tok && in_tok->value)
256 arg = xstrdup(in_tok->value);
257 else
258 arg = xstrdup("");
259 }
260 arg_tok->value = apply_command(arg_tok->conf.command, arg);
261 free((char *)arg);
262 }
263}
264
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265static void apply_arg_if_exists(struct trailer_item *in_tok,
266 struct trailer_item *arg_tok,
267 struct trailer_item *on_tok,
268 struct trailer_item **in_tok_first,
269 struct trailer_item **in_tok_last)
270{
271 switch (arg_tok->conf.if_exists) {
272 case EXISTS_DO_NOTHING:
273 free_trailer_item(arg_tok);
274 break;
275 case EXISTS_REPLACE:
85039fb6 276 apply_item_command(in_tok, arg_tok);
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277 add_arg_to_input_list(on_tok, arg_tok,
278 in_tok_first, in_tok_last);
279 remove_from_list(in_tok, in_tok_first, in_tok_last);
280 free_trailer_item(in_tok);
281 break;
282 case EXISTS_ADD:
85039fb6 283 apply_item_command(in_tok, arg_tok);
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284 add_arg_to_input_list(on_tok, arg_tok,
285 in_tok_first, in_tok_last);
286 break;
287 case EXISTS_ADD_IF_DIFFERENT:
85039fb6 288 apply_item_command(in_tok, arg_tok);
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289 if (check_if_different(in_tok, arg_tok, 1))
290 add_arg_to_input_list(on_tok, arg_tok,
291 in_tok_first, in_tok_last);
292 else
293 free_trailer_item(arg_tok);
294 break;
295 case EXISTS_ADD_IF_DIFFERENT_NEIGHBOR:
85039fb6 296 apply_item_command(in_tok, arg_tok);
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297 if (check_if_different(on_tok, arg_tok, 0))
298 add_arg_to_input_list(on_tok, arg_tok,
299 in_tok_first, in_tok_last);
300 else
301 free_trailer_item(arg_tok);
302 break;
303 }
304}
305
306static void apply_arg_if_missing(struct trailer_item **in_tok_first,
307 struct trailer_item **in_tok_last,
308 struct trailer_item *arg_tok)
309{
310 struct trailer_item **in_tok;
311 enum action_where where;
312
313 switch (arg_tok->conf.if_missing) {
314 case MISSING_DO_NOTHING:
315 free_trailer_item(arg_tok);
316 break;
317 case MISSING_ADD:
318 where = arg_tok->conf.where;
319 in_tok = after_or_end(where) ? in_tok_last : in_tok_first;
85039fb6 320 apply_item_command(NULL, arg_tok);
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CC
321 if (*in_tok) {
322 add_arg_to_input_list(*in_tok, arg_tok,
323 in_tok_first, in_tok_last);
324 } else {
325 *in_tok_first = arg_tok;
326 *in_tok_last = arg_tok;
327 }
328 break;
329 }
330}
331
332static int find_same_and_apply_arg(struct trailer_item **in_tok_first,
333 struct trailer_item **in_tok_last,
334 struct trailer_item *arg_tok)
335{
336 struct trailer_item *in_tok;
337 struct trailer_item *on_tok;
338 struct trailer_item *following_tok;
339
340 enum action_where where = arg_tok->conf.where;
341 int middle = (where == WHERE_AFTER) || (where == WHERE_BEFORE);
342 int backwards = after_or_end(where);
343 struct trailer_item *start_tok = backwards ? *in_tok_last : *in_tok_first;
344
345 for (in_tok = start_tok; in_tok; in_tok = following_tok) {
346 following_tok = backwards ? in_tok->previous : in_tok->next;
347 if (!same_token(in_tok, arg_tok))
348 continue;
349 on_tok = middle ? in_tok : start_tok;
350 apply_arg_if_exists(in_tok, arg_tok, on_tok,
351 in_tok_first, in_tok_last);
352 return 1;
353 }
354 return 0;
355}
356
357static void process_trailers_lists(struct trailer_item **in_tok_first,
358 struct trailer_item **in_tok_last,
359 struct trailer_item **arg_tok_first)
360{
361 struct trailer_item *arg_tok;
362 struct trailer_item *next_arg;
363
364 if (!*arg_tok_first)
365 return;
366
367 for (arg_tok = *arg_tok_first; arg_tok; arg_tok = next_arg) {
368 int applied = 0;
369
370 next_arg = arg_tok->next;
371 remove_from_list(arg_tok, arg_tok_first, NULL);
372
373 applied = find_same_and_apply_arg(in_tok_first,
374 in_tok_last,
375 arg_tok);
376
377 if (!applied)
378 apply_arg_if_missing(in_tok_first,
379 in_tok_last,
380 arg_tok);
381 }
382}
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CC
383
384static int set_where(struct conf_info *item, const char *value)
385{
386 if (!strcasecmp("after", value))
387 item->where = WHERE_AFTER;
388 else if (!strcasecmp("before", value))
389 item->where = WHERE_BEFORE;
390 else if (!strcasecmp("end", value))
391 item->where = WHERE_END;
392 else if (!strcasecmp("start", value))
393 item->where = WHERE_START;
394 else
395 return -1;
396 return 0;
397}
398
399static int set_if_exists(struct conf_info *item, const char *value)
400{
401 if (!strcasecmp("addIfDifferent", value))
402 item->if_exists = EXISTS_ADD_IF_DIFFERENT;
403 else if (!strcasecmp("addIfDifferentNeighbor", value))
404 item->if_exists = EXISTS_ADD_IF_DIFFERENT_NEIGHBOR;
405 else if (!strcasecmp("add", value))
406 item->if_exists = EXISTS_ADD;
407 else if (!strcasecmp("replace", value))
408 item->if_exists = EXISTS_REPLACE;
409 else if (!strcasecmp("doNothing", value))
410 item->if_exists = EXISTS_DO_NOTHING;
411 else
412 return -1;
413 return 0;
414}
415
416static int set_if_missing(struct conf_info *item, const char *value)
417{
418 if (!strcasecmp("doNothing", value))
419 item->if_missing = MISSING_DO_NOTHING;
420 else if (!strcasecmp("add", value))
421 item->if_missing = MISSING_ADD;
422 else
423 return -1;
424 return 0;
425}
426
427static void duplicate_conf(struct conf_info *dst, struct conf_info *src)
428{
429 *dst = *src;
430 if (src->name)
431 dst->name = xstrdup(src->name);
432 if (src->key)
433 dst->key = xstrdup(src->key);
434 if (src->command)
435 dst->command = xstrdup(src->command);
436}
437
438static struct trailer_item *get_conf_item(const char *name)
439{
440 struct trailer_item *item;
441 struct trailer_item *previous;
442
443 /* Look up item with same name */
444 for (previous = NULL, item = first_conf_item;
445 item;
446 previous = item, item = item->next) {
447 if (!strcasecmp(item->conf.name, name))
448 return item;
449 }
450
451 /* Item does not already exists, create it */
452 item = xcalloc(sizeof(struct trailer_item), 1);
453 duplicate_conf(&item->conf, &default_conf_info);
454 item->conf.name = xstrdup(name);
455
456 if (!previous)
457 first_conf_item = item;
458 else {
459 previous->next = item;
460 item->previous = previous;
461 }
462
463 return item;
464}
465
466enum trailer_info_type { TRAILER_KEY, TRAILER_COMMAND, TRAILER_WHERE,
467 TRAILER_IF_EXISTS, TRAILER_IF_MISSING };
468
469static struct {
470 const char *name;
471 enum trailer_info_type type;
472} trailer_config_items[] = {
473 { "key", TRAILER_KEY },
474 { "command", TRAILER_COMMAND },
475 { "where", TRAILER_WHERE },
476 { "ifexists", TRAILER_IF_EXISTS },
477 { "ifmissing", TRAILER_IF_MISSING }
478};
479
480static int git_trailer_default_config(const char *conf_key, const char *value, void *cb)
481{
482 const char *trailer_item, *variable_name;
483
484 if (!skip_prefix(conf_key, "trailer.", &trailer_item))
485 return 0;
486
487 variable_name = strrchr(trailer_item, '.');
488 if (!variable_name) {
489 if (!strcmp(trailer_item, "where")) {
490 if (set_where(&default_conf_info, value) < 0)
491 warning(_("unknown value '%s' for key '%s'"),
492 value, conf_key);
493 } else if (!strcmp(trailer_item, "ifexists")) {
494 if (set_if_exists(&default_conf_info, value) < 0)
495 warning(_("unknown value '%s' for key '%s'"),
496 value, conf_key);
497 } else if (!strcmp(trailer_item, "ifmissing")) {
498 if (set_if_missing(&default_conf_info, value) < 0)
499 warning(_("unknown value '%s' for key '%s'"),
500 value, conf_key);
501 } else if (!strcmp(trailer_item, "separators")) {
502 separators = xstrdup(value);
503 }
504 }
505 return 0;
506}
507
508static int git_trailer_config(const char *conf_key, const char *value, void *cb)
509{
510 const char *trailer_item, *variable_name;
511 struct trailer_item *item;
512 struct conf_info *conf;
513 char *name = NULL;
514 enum trailer_info_type type;
515 int i;
516
517 if (!skip_prefix(conf_key, "trailer.", &trailer_item))
518 return 0;
519
520 variable_name = strrchr(trailer_item, '.');
521 if (!variable_name)
522 return 0;
523
524 variable_name++;
525 for (i = 0; i < ARRAY_SIZE(trailer_config_items); i++) {
526 if (strcmp(trailer_config_items[i].name, variable_name))
527 continue;
528 name = xstrndup(trailer_item, variable_name - trailer_item - 1);
529 type = trailer_config_items[i].type;
530 break;
531 }
532
533 if (!name)
534 return 0;
535
536 item = get_conf_item(name);
537 conf = &item->conf;
538 free(name);
539
540 switch (type) {
541 case TRAILER_KEY:
542 if (conf->key)
543 warning(_("more than one %s"), conf_key);
544 conf->key = xstrdup(value);
545 break;
546 case TRAILER_COMMAND:
547 if (conf->command)
548 warning(_("more than one %s"), conf_key);
549 conf->command = xstrdup(value);
550 break;
551 case TRAILER_WHERE:
552 if (set_where(conf, value))
553 warning(_("unknown value '%s' for key '%s'"), value, conf_key);
554 break;
555 case TRAILER_IF_EXISTS:
556 if (set_if_exists(conf, value))
557 warning(_("unknown value '%s' for key '%s'"), value, conf_key);
558 break;
559 case TRAILER_IF_MISSING:
560 if (set_if_missing(conf, value))
561 warning(_("unknown value '%s' for key '%s'"), value, conf_key);
562 break;
563 default:
564 die("internal bug in trailer.c");
565 }
566 return 0;
567}
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568
569static int parse_trailer(struct strbuf *tok, struct strbuf *val, const char *trailer)
570{
571 size_t len;
572 struct strbuf seps = STRBUF_INIT;
573 strbuf_addstr(&seps, separators);
574 strbuf_addch(&seps, '=');
575 len = strcspn(trailer, seps.buf);
576 strbuf_release(&seps);
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CC
577 if (len == 0) {
578 int l = strlen(trailer);
579 while (l > 0 && isspace(trailer[l - 1]))
580 l--;
581 return error(_("empty trailer token in trailer '%.*s'"), l, trailer);
582 }
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CC
583 if (len < strlen(trailer)) {
584 strbuf_add(tok, trailer, len);
585 strbuf_trim(tok);
586 strbuf_addstr(val, trailer + len + 1);
587 strbuf_trim(val);
588 } else {
589 strbuf_addstr(tok, trailer);
590 strbuf_trim(tok);
591 }
592 return 0;
593}
594
595static const char *token_from_item(struct trailer_item *item, char *tok)
596{
597 if (item->conf.key)
598 return item->conf.key;
599 if (tok)
600 return tok;
601 return item->conf.name;
602}
603
604static struct trailer_item *new_trailer_item(struct trailer_item *conf_item,
605 char *tok, char *val)
606{
607 struct trailer_item *new = xcalloc(sizeof(*new), 1);
85039fb6 608 new->value = val ? val : xstrdup("");
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CC
609
610 if (conf_item) {
611 duplicate_conf(&new->conf, &conf_item->conf);
612 new->token = xstrdup(token_from_item(conf_item, tok));
613 free(tok);
614 } else {
615 duplicate_conf(&new->conf, &default_conf_info);
616 new->token = tok;
617 }
618
619 return new;
620}
621
622static int token_matches_item(const char *tok, struct trailer_item *item, int tok_len)
623{
624 if (!strncasecmp(tok, item->conf.name, tok_len))
625 return 1;
626 return item->conf.key ? !strncasecmp(tok, item->conf.key, tok_len) : 0;
627}
628
629static struct trailer_item *create_trailer_item(const char *string)
630{
631 struct strbuf tok = STRBUF_INIT;
632 struct strbuf val = STRBUF_INIT;
633 struct trailer_item *item;
634 int tok_len;
635
636 if (parse_trailer(&tok, &val, string))
637 return NULL;
638
639 tok_len = token_len_without_separator(tok.buf, tok.len);
640
641 /* Lookup if the token matches something in the config */
642 for (item = first_conf_item; item; item = item->next) {
643 if (token_matches_item(tok.buf, item, tok_len))
644 return new_trailer_item(item,
645 strbuf_detach(&tok, NULL),
646 strbuf_detach(&val, NULL));
647 }
648
649 return new_trailer_item(NULL,
650 strbuf_detach(&tok, NULL),
651 strbuf_detach(&val, NULL));
652}
653
654static void add_trailer_item(struct trailer_item **first,
655 struct trailer_item **last,
656 struct trailer_item *new)
657{
658 if (!new)
659 return;
660 if (!*last) {
661 *first = new;
662 *last = new;
663 } else {
664 (*last)->next = new;
665 new->previous = *last;
666 *last = new;
667 }
668}
669
670static struct trailer_item *process_command_line_args(struct string_list *trailers)
671{
672 struct trailer_item *arg_tok_first = NULL;
673 struct trailer_item *arg_tok_last = NULL;
674 struct string_list_item *tr;
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CC
675 struct trailer_item *item;
676
677 /* Add a trailer item for each configured trailer with a command */
678 for (item = first_conf_item; item; item = item->next) {
679 if (item->conf.command) {
680 struct trailer_item *new = new_trailer_item(item, NULL, NULL);
681 add_trailer_item(&arg_tok_first, &arg_tok_last, new);
682 }
683 }
f0a90b4e 684
85039fb6 685 /* Add a trailer item for each trailer on the command line */
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CC
686 for_each_string_list_item(tr, trailers) {
687 struct trailer_item *new = create_trailer_item(tr->string);
688 add_trailer_item(&arg_tok_first, &arg_tok_last, new);
689 }
690
691 return arg_tok_first;
692}
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CC
693
694static struct strbuf **read_input_file(const char *file)
695{
696 struct strbuf **lines;
697 struct strbuf sb = STRBUF_INIT;
698
699 if (file) {
700 if (strbuf_read_file(&sb, file, 0) < 0)
701 die_errno(_("could not read input file '%s'"), file);
702 } else {
703 if (strbuf_read(&sb, fileno(stdin), 0) < 0)
704 die_errno(_("could not read from stdin"));
705 }
706
707 lines = strbuf_split(&sb, '\n');
708
709 strbuf_release(&sb);
710
711 return lines;
712}
713
714/*
715 * Return the (0 based) index of the start of the patch or the line
716 * count if there is no patch in the message.
717 */
718static int find_patch_start(struct strbuf **lines, int count)
719{
720 int i;
721
722 /* Get the start of the patch part if any */
723 for (i = 0; i < count; i++) {
724 if (starts_with(lines[i]->buf, "---"))
725 return i;
726 }
727
728 return count;
729}
730
731/*
732 * Return the (0 based) index of the first trailer line or count if
733 * there are no trailers. Trailers are searched only in the lines from
734 * index (count - 1) down to index 0.
735 */
736static int find_trailer_start(struct strbuf **lines, int count)
737{
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738 int start, end_of_title, only_spaces = 1;
739
740 /* The first paragraph is the title and cannot be trailers */
741 for (start = 0; start < count; start++) {
742 if (lines[start]->buf[0] == comment_line_char)
743 continue;
744 if (contains_only_spaces(lines[start]->buf))
745 break;
746 }
747 end_of_title = start;
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748
749 /*
750 * Get the start of the trailers by looking starting from the end
751 * for a line with only spaces before lines with one separator.
752 */
5c99995d 753 for (start = count - 1; start >= end_of_title; start--) {
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754 if (lines[start]->buf[0] == comment_line_char)
755 continue;
756 if (contains_only_spaces(lines[start]->buf)) {
757 if (only_spaces)
758 continue;
759 return start + 1;
760 }
761 if (strcspn(lines[start]->buf, separators) < lines[start]->len) {
762 if (only_spaces)
763 only_spaces = 0;
764 continue;
765 }
766 return count;
767 }
768
769 return only_spaces ? count : 0;
770}
771
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772/* Get the index of the end of the trailers */
773static int find_trailer_end(struct strbuf **lines, int patch_start)
774{
775 struct strbuf sb = STRBUF_INIT;
776 int i, ignore_bytes;
777
778 for (i = 0; i < patch_start; i++)
779 strbuf_addbuf(&sb, lines[i]);
780 ignore_bytes = ignore_non_trailer(&sb);
781 strbuf_release(&sb);
782 for (i = patch_start - 1; i >= 0 && ignore_bytes > 0; i--)
783 ignore_bytes -= lines[i]->len;
784
785 return i + 1;
786}
787
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788static int has_blank_line_before(struct strbuf **lines, int start)
789{
790 for (;start >= 0; start--) {
791 if (lines[start]->buf[0] == comment_line_char)
792 continue;
793 return contains_only_spaces(lines[start]->buf);
794 }
795 return 0;
796}
797
d0d2344a 798static void print_lines(FILE *outfile, struct strbuf **lines, int start, int end)
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799{
800 int i;
801 for (i = start; lines[i] && i < end; i++)
d0d2344a 802 fprintf(outfile, "%s", lines[i]->buf);
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803}
804
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805static int process_input_file(FILE *outfile,
806 struct strbuf **lines,
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807 struct trailer_item **in_tok_first,
808 struct trailer_item **in_tok_last)
809{
810 int count = 0;
61cfef4c 811 int patch_start, trailer_start, trailer_end, i;
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812
813 /* Get the line count */
814 while (lines[count])
815 count++;
816
817 patch_start = find_patch_start(lines, count);
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818 trailer_end = find_trailer_end(lines, patch_start);
819 trailer_start = find_trailer_start(lines, trailer_end);
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820
821 /* Print lines before the trailers as is */
d0d2344a 822 print_lines(outfile, lines, 0, trailer_start);
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823
824 if (!has_blank_line_before(lines, trailer_start - 1))
d0d2344a 825 fprintf(outfile, "\n");
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826
827 /* Parse trailer lines */
61cfef4c 828 for (i = trailer_start; i < trailer_end; i++) {
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829 if (lines[i]->buf[0] != comment_line_char) {
830 struct trailer_item *new = create_trailer_item(lines[i]->buf);
831 add_trailer_item(in_tok_first, in_tok_last, new);
832 }
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833 }
834
61cfef4c 835 return trailer_end;
2013d850 836}
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837
838static void free_all(struct trailer_item **first)
839{
840 while (*first) {
841 struct trailer_item *item = remove_first(first);
842 free_trailer_item(item);
843 }
844}
845
846void process_trailers(const char *file, int trim_empty, struct string_list *trailers)
847{
848 struct trailer_item *in_tok_first = NULL;
849 struct trailer_item *in_tok_last = NULL;
850 struct trailer_item *arg_tok_first;
851 struct strbuf **lines;
61cfef4c 852 int trailer_end;
d0d2344a 853 FILE *outfile = stdout;
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854
855 /* Default config must be setup first */
856 git_config(git_trailer_default_config, NULL);
857 git_config(git_trailer_config, NULL);
858
859 lines = read_input_file(file);
860
861 /* Print the lines before the trailers */
d0d2344a 862 trailer_end = process_input_file(outfile, lines, &in_tok_first, &in_tok_last);
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863
864 arg_tok_first = process_command_line_args(trailers);
865
866 process_trailers_lists(&in_tok_first, &in_tok_last, &arg_tok_first);
867
d0d2344a 868 print_all(outfile, in_tok_first, trim_empty);
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869
870 free_all(&in_tok_first);
871
872 /* Print the lines after the trailers as is */
d0d2344a 873 print_lines(outfile, lines, trailer_end, INT_MAX);
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874
875 strbuf_list_free(lines);
876}