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[git/git.git] / trailer.c
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9385b5d7 1#include "cache.h"
f0a90b4e 2#include "string-list.h"
85039fb6 3#include "run-command.h"
61cfef4c 4#include "commit.h"
e1f89863 5#include "tempfile.h"
b1d78d77 6#include "trailer.h"
9385b5d7
CC
7/*
8 * Copyright (c) 2013, 2014 Christian Couder <chriscool@tuxfamily.org>
9 */
10
11enum action_where { WHERE_END, WHERE_AFTER, WHERE_BEFORE, WHERE_START };
12enum action_if_exists { EXISTS_ADD_IF_DIFFERENT_NEIGHBOR, EXISTS_ADD_IF_DIFFERENT,
13 EXISTS_ADD, EXISTS_REPLACE, EXISTS_DO_NOTHING };
14enum action_if_missing { MISSING_ADD, MISSING_DO_NOTHING };
15
16struct conf_info {
17 char *name;
18 char *key;
19 char *command;
20 enum action_where where;
21 enum action_if_exists if_exists;
22 enum action_if_missing if_missing;
23};
24
25static struct conf_info default_conf_info;
26
27struct trailer_item {
28 struct trailer_item *previous;
29 struct trailer_item *next;
30 const char *token;
31 const char *value;
32 struct conf_info conf;
33};
34
35static struct trailer_item *first_conf_item;
36
37static char *separators = ":";
38
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39#define TRAILER_ARG_STRING "$ARG"
40
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41static int after_or_end(enum action_where where)
42{
43 return (where == WHERE_AFTER) || (where == WHERE_END);
44}
45
46/*
47 * Return the length of the string not including any final
48 * punctuation. E.g., the input "Signed-off-by:" would return
49 * 13, stripping the trailing punctuation but retaining
50 * internal punctuation.
51 */
52static size_t token_len_without_separator(const char *token, size_t len)
53{
54 while (len > 0 && !isalnum(token[len - 1]))
55 len--;
56 return len;
57}
58
59static int same_token(struct trailer_item *a, struct trailer_item *b)
60{
61 size_t a_len = token_len_without_separator(a->token, strlen(a->token));
62 size_t b_len = token_len_without_separator(b->token, strlen(b->token));
63 size_t min_len = (a_len > b_len) ? b_len : a_len;
64
65 return !strncasecmp(a->token, b->token, min_len);
66}
67
68static int same_value(struct trailer_item *a, struct trailer_item *b)
69{
70 return !strcasecmp(a->value, b->value);
71}
72
73static int same_trailer(struct trailer_item *a, struct trailer_item *b)
74{
75 return same_token(a, b) && same_value(a, b);
76}
4103818d 77
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78static inline int contains_only_spaces(const char *str)
79{
80 const char *s = str;
81 while (*s && isspace(*s))
82 s++;
83 return !*s;
84}
85
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86static inline void strbuf_replace(struct strbuf *sb, const char *a, const char *b)
87{
88 const char *ptr = strstr(sb->buf, a);
89 if (ptr)
90 strbuf_splice(sb, ptr - sb->buf, strlen(a), b, strlen(b));
91}
92
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93static void free_trailer_item(struct trailer_item *item)
94{
95 free(item->conf.name);
96 free(item->conf.key);
97 free(item->conf.command);
98 free((char *)item->token);
99 free((char *)item->value);
100 free(item);
101}
102
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103static char last_non_space_char(const char *s)
104{
105 int i;
106 for (i = strlen(s) - 1; i >= 0; i--)
107 if (!isspace(s[i]))
108 return s[i];
109 return '\0';
110}
111
d0d2344a 112static void print_tok_val(FILE *outfile, const char *tok, const char *val)
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CC
113{
114 char c = last_non_space_char(tok);
115 if (!c)
116 return;
117 if (strchr(separators, c))
d0d2344a 118 fprintf(outfile, "%s%s\n", tok, val);
b1d78d77 119 else
d0d2344a 120 fprintf(outfile, "%s%c %s\n", tok, separators[0], val);
b1d78d77
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121}
122
d0d2344a 123static void print_all(FILE *outfile, struct trailer_item *first, int trim_empty)
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124{
125 struct trailer_item *item;
126 for (item = first; item; item = item->next) {
127 if (!trim_empty || strlen(item->value) > 0)
d0d2344a 128 print_tok_val(outfile, item->token, item->value);
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129 }
130}
131
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132static void update_last(struct trailer_item **last)
133{
134 if (*last)
135 while ((*last)->next != NULL)
136 *last = (*last)->next;
137}
138
139static void update_first(struct trailer_item **first)
140{
141 if (*first)
142 while ((*first)->previous != NULL)
143 *first = (*first)->previous;
144}
145
146static void add_arg_to_input_list(struct trailer_item *on_tok,
147 struct trailer_item *arg_tok,
148 struct trailer_item **first,
149 struct trailer_item **last)
150{
151 if (after_or_end(arg_tok->conf.where)) {
152 arg_tok->next = on_tok->next;
153 on_tok->next = arg_tok;
154 arg_tok->previous = on_tok;
155 if (arg_tok->next)
156 arg_tok->next->previous = arg_tok;
157 update_last(last);
158 } else {
159 arg_tok->previous = on_tok->previous;
160 on_tok->previous = arg_tok;
161 arg_tok->next = on_tok;
162 if (arg_tok->previous)
163 arg_tok->previous->next = arg_tok;
164 update_first(first);
165 }
166}
167
168static int check_if_different(struct trailer_item *in_tok,
169 struct trailer_item *arg_tok,
170 int check_all)
171{
172 enum action_where where = arg_tok->conf.where;
173 do {
174 if (!in_tok)
175 return 1;
176 if (same_trailer(in_tok, arg_tok))
177 return 0;
178 /*
179 * if we want to add a trailer after another one,
180 * we have to check those before this one
181 */
182 in_tok = after_or_end(where) ? in_tok->previous : in_tok->next;
183 } while (check_all);
184 return 1;
185}
186
187static void remove_from_list(struct trailer_item *item,
188 struct trailer_item **first,
189 struct trailer_item **last)
190{
191 struct trailer_item *next = item->next;
192 struct trailer_item *previous = item->previous;
193
194 if (next) {
195 item->next->previous = previous;
196 item->next = NULL;
197 } else if (last)
198 *last = previous;
199
200 if (previous) {
201 item->previous->next = next;
202 item->previous = NULL;
203 } else if (first)
204 *first = next;
205}
206
207static struct trailer_item *remove_first(struct trailer_item **first)
208{
209 struct trailer_item *item = *first;
210 *first = item->next;
211 if (item->next) {
212 item->next->previous = NULL;
213 item->next = NULL;
214 }
215 return item;
216}
217
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218static const char *apply_command(const char *command, const char *arg)
219{
220 struct strbuf cmd = STRBUF_INIT;
221 struct strbuf buf = STRBUF_INIT;
b226293b 222 struct child_process cp = CHILD_PROCESS_INIT;
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223 const char *argv[] = {NULL, NULL};
224 const char *result;
225
226 strbuf_addstr(&cmd, command);
227 if (arg)
228 strbuf_replace(&cmd, TRAILER_ARG_STRING, arg);
229
230 argv[0] = cmd.buf;
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231 cp.argv = argv;
232 cp.env = local_repo_env;
233 cp.no_stdin = 1;
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234 cp.use_shell = 1;
235
c5eadcaa 236 if (capture_command(&cp, &buf, 1024)) {
13ad56f8 237 error(_("running trailer command '%s' failed"), cmd.buf);
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238 strbuf_release(&buf);
239 result = xstrdup("");
c5eadcaa
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240 } else {
241 strbuf_trim(&buf);
85039fb6 242 result = strbuf_detach(&buf, NULL);
c5eadcaa 243 }
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244
245 strbuf_release(&cmd);
246 return result;
247}
248
249static void apply_item_command(struct trailer_item *in_tok, struct trailer_item *arg_tok)
250{
251 if (arg_tok->conf.command) {
252 const char *arg;
253 if (arg_tok->value && arg_tok->value[0]) {
254 arg = arg_tok->value;
255 } else {
256 if (in_tok && in_tok->value)
257 arg = xstrdup(in_tok->value);
258 else
259 arg = xstrdup("");
260 }
261 arg_tok->value = apply_command(arg_tok->conf.command, arg);
262 free((char *)arg);
263 }
264}
265
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266static void apply_arg_if_exists(struct trailer_item *in_tok,
267 struct trailer_item *arg_tok,
268 struct trailer_item *on_tok,
269 struct trailer_item **in_tok_first,
270 struct trailer_item **in_tok_last)
271{
272 switch (arg_tok->conf.if_exists) {
273 case EXISTS_DO_NOTHING:
274 free_trailer_item(arg_tok);
275 break;
276 case EXISTS_REPLACE:
85039fb6 277 apply_item_command(in_tok, arg_tok);
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278 add_arg_to_input_list(on_tok, arg_tok,
279 in_tok_first, in_tok_last);
280 remove_from_list(in_tok, in_tok_first, in_tok_last);
281 free_trailer_item(in_tok);
282 break;
283 case EXISTS_ADD:
85039fb6 284 apply_item_command(in_tok, arg_tok);
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285 add_arg_to_input_list(on_tok, arg_tok,
286 in_tok_first, in_tok_last);
287 break;
288 case EXISTS_ADD_IF_DIFFERENT:
85039fb6 289 apply_item_command(in_tok, arg_tok);
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290 if (check_if_different(in_tok, arg_tok, 1))
291 add_arg_to_input_list(on_tok, arg_tok,
292 in_tok_first, in_tok_last);
293 else
294 free_trailer_item(arg_tok);
295 break;
296 case EXISTS_ADD_IF_DIFFERENT_NEIGHBOR:
85039fb6 297 apply_item_command(in_tok, arg_tok);
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298 if (check_if_different(on_tok, arg_tok, 0))
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 }
305}
306
307static void apply_arg_if_missing(struct trailer_item **in_tok_first,
308 struct trailer_item **in_tok_last,
309 struct trailer_item *arg_tok)
310{
311 struct trailer_item **in_tok;
312 enum action_where where;
313
314 switch (arg_tok->conf.if_missing) {
315 case MISSING_DO_NOTHING:
316 free_trailer_item(arg_tok);
317 break;
318 case MISSING_ADD:
319 where = arg_tok->conf.where;
320 in_tok = after_or_end(where) ? in_tok_last : in_tok_first;
85039fb6 321 apply_item_command(NULL, arg_tok);
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322 if (*in_tok) {
323 add_arg_to_input_list(*in_tok, arg_tok,
324 in_tok_first, in_tok_last);
325 } else {
326 *in_tok_first = arg_tok;
327 *in_tok_last = arg_tok;
328 }
329 break;
330 }
331}
332
333static int find_same_and_apply_arg(struct trailer_item **in_tok_first,
334 struct trailer_item **in_tok_last,
335 struct trailer_item *arg_tok)
336{
337 struct trailer_item *in_tok;
338 struct trailer_item *on_tok;
339 struct trailer_item *following_tok;
340
341 enum action_where where = arg_tok->conf.where;
342 int middle = (where == WHERE_AFTER) || (where == WHERE_BEFORE);
343 int backwards = after_or_end(where);
344 struct trailer_item *start_tok = backwards ? *in_tok_last : *in_tok_first;
345
346 for (in_tok = start_tok; in_tok; in_tok = following_tok) {
347 following_tok = backwards ? in_tok->previous : in_tok->next;
348 if (!same_token(in_tok, arg_tok))
349 continue;
350 on_tok = middle ? in_tok : start_tok;
351 apply_arg_if_exists(in_tok, arg_tok, on_tok,
352 in_tok_first, in_tok_last);
353 return 1;
354 }
355 return 0;
356}
357
358static void process_trailers_lists(struct trailer_item **in_tok_first,
359 struct trailer_item **in_tok_last,
360 struct trailer_item **arg_tok_first)
361{
362 struct trailer_item *arg_tok;
363 struct trailer_item *next_arg;
364
365 if (!*arg_tok_first)
366 return;
367
368 for (arg_tok = *arg_tok_first; arg_tok; arg_tok = next_arg) {
369 int applied = 0;
370
371 next_arg = arg_tok->next;
372 remove_from_list(arg_tok, arg_tok_first, NULL);
373
374 applied = find_same_and_apply_arg(in_tok_first,
375 in_tok_last,
376 arg_tok);
377
378 if (!applied)
379 apply_arg_if_missing(in_tok_first,
380 in_tok_last,
381 arg_tok);
382 }
383}
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384
385static int set_where(struct conf_info *item, const char *value)
386{
387 if (!strcasecmp("after", value))
388 item->where = WHERE_AFTER;
389 else if (!strcasecmp("before", value))
390 item->where = WHERE_BEFORE;
391 else if (!strcasecmp("end", value))
392 item->where = WHERE_END;
393 else if (!strcasecmp("start", value))
394 item->where = WHERE_START;
395 else
396 return -1;
397 return 0;
398}
399
400static int set_if_exists(struct conf_info *item, const char *value)
401{
402 if (!strcasecmp("addIfDifferent", value))
403 item->if_exists = EXISTS_ADD_IF_DIFFERENT;
404 else if (!strcasecmp("addIfDifferentNeighbor", value))
405 item->if_exists = EXISTS_ADD_IF_DIFFERENT_NEIGHBOR;
406 else if (!strcasecmp("add", value))
407 item->if_exists = EXISTS_ADD;
408 else if (!strcasecmp("replace", value))
409 item->if_exists = EXISTS_REPLACE;
410 else if (!strcasecmp("doNothing", value))
411 item->if_exists = EXISTS_DO_NOTHING;
412 else
413 return -1;
414 return 0;
415}
416
417static int set_if_missing(struct conf_info *item, const char *value)
418{
419 if (!strcasecmp("doNothing", value))
420 item->if_missing = MISSING_DO_NOTHING;
421 else if (!strcasecmp("add", value))
422 item->if_missing = MISSING_ADD;
423 else
424 return -1;
425 return 0;
426}
427
428static void duplicate_conf(struct conf_info *dst, struct conf_info *src)
429{
430 *dst = *src;
431 if (src->name)
432 dst->name = xstrdup(src->name);
433 if (src->key)
434 dst->key = xstrdup(src->key);
435 if (src->command)
436 dst->command = xstrdup(src->command);
437}
438
439static struct trailer_item *get_conf_item(const char *name)
440{
441 struct trailer_item *item;
442 struct trailer_item *previous;
443
444 /* Look up item with same name */
445 for (previous = NULL, item = first_conf_item;
446 item;
447 previous = item, item = item->next) {
448 if (!strcasecmp(item->conf.name, name))
449 return item;
450 }
451
452 /* Item does not already exists, create it */
453 item = xcalloc(sizeof(struct trailer_item), 1);
454 duplicate_conf(&item->conf, &default_conf_info);
455 item->conf.name = xstrdup(name);
456
457 if (!previous)
458 first_conf_item = item;
459 else {
460 previous->next = item;
461 item->previous = previous;
462 }
463
464 return item;
465}
466
467enum trailer_info_type { TRAILER_KEY, TRAILER_COMMAND, TRAILER_WHERE,
468 TRAILER_IF_EXISTS, TRAILER_IF_MISSING };
469
470static struct {
471 const char *name;
472 enum trailer_info_type type;
473} trailer_config_items[] = {
474 { "key", TRAILER_KEY },
475 { "command", TRAILER_COMMAND },
476 { "where", TRAILER_WHERE },
477 { "ifexists", TRAILER_IF_EXISTS },
478 { "ifmissing", TRAILER_IF_MISSING }
479};
480
481static int git_trailer_default_config(const char *conf_key, const char *value, void *cb)
482{
483 const char *trailer_item, *variable_name;
484
485 if (!skip_prefix(conf_key, "trailer.", &trailer_item))
486 return 0;
487
488 variable_name = strrchr(trailer_item, '.');
489 if (!variable_name) {
490 if (!strcmp(trailer_item, "where")) {
491 if (set_where(&default_conf_info, value) < 0)
492 warning(_("unknown value '%s' for key '%s'"),
493 value, conf_key);
494 } else if (!strcmp(trailer_item, "ifexists")) {
495 if (set_if_exists(&default_conf_info, value) < 0)
496 warning(_("unknown value '%s' for key '%s'"),
497 value, conf_key);
498 } else if (!strcmp(trailer_item, "ifmissing")) {
499 if (set_if_missing(&default_conf_info, value) < 0)
500 warning(_("unknown value '%s' for key '%s'"),
501 value, conf_key);
502 } else if (!strcmp(trailer_item, "separators")) {
503 separators = xstrdup(value);
504 }
505 }
506 return 0;
507}
508
509static int git_trailer_config(const char *conf_key, const char *value, void *cb)
510{
511 const char *trailer_item, *variable_name;
512 struct trailer_item *item;
513 struct conf_info *conf;
514 char *name = NULL;
515 enum trailer_info_type type;
516 int i;
517
518 if (!skip_prefix(conf_key, "trailer.", &trailer_item))
519 return 0;
520
521 variable_name = strrchr(trailer_item, '.');
522 if (!variable_name)
523 return 0;
524
525 variable_name++;
526 for (i = 0; i < ARRAY_SIZE(trailer_config_items); i++) {
527 if (strcmp(trailer_config_items[i].name, variable_name))
528 continue;
529 name = xstrndup(trailer_item, variable_name - trailer_item - 1);
530 type = trailer_config_items[i].type;
531 break;
532 }
533
534 if (!name)
535 return 0;
536
537 item = get_conf_item(name);
538 conf = &item->conf;
539 free(name);
540
541 switch (type) {
542 case TRAILER_KEY:
543 if (conf->key)
544 warning(_("more than one %s"), conf_key);
545 conf->key = xstrdup(value);
546 break;
547 case TRAILER_COMMAND:
548 if (conf->command)
549 warning(_("more than one %s"), conf_key);
550 conf->command = xstrdup(value);
551 break;
552 case TRAILER_WHERE:
553 if (set_where(conf, value))
554 warning(_("unknown value '%s' for key '%s'"), value, conf_key);
555 break;
556 case TRAILER_IF_EXISTS:
557 if (set_if_exists(conf, value))
558 warning(_("unknown value '%s' for key '%s'"), value, conf_key);
559 break;
560 case TRAILER_IF_MISSING:
561 if (set_if_missing(conf, value))
562 warning(_("unknown value '%s' for key '%s'"), value, conf_key);
563 break;
564 default:
ef1177d1 565 die("BUG: trailer.c: unhandled type %d", type);
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566 }
567 return 0;
568}
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569
570static int parse_trailer(struct strbuf *tok, struct strbuf *val, const char *trailer)
571{
572 size_t len;
573 struct strbuf seps = STRBUF_INIT;
574 strbuf_addstr(&seps, separators);
575 strbuf_addch(&seps, '=');
576 len = strcspn(trailer, seps.buf);
577 strbuf_release(&seps);
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578 if (len == 0) {
579 int l = strlen(trailer);
580 while (l > 0 && isspace(trailer[l - 1]))
581 l--;
582 return error(_("empty trailer token in trailer '%.*s'"), l, trailer);
583 }
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CC
584 if (len < strlen(trailer)) {
585 strbuf_add(tok, trailer, len);
586 strbuf_trim(tok);
587 strbuf_addstr(val, trailer + len + 1);
588 strbuf_trim(val);
589 } else {
590 strbuf_addstr(tok, trailer);
591 strbuf_trim(tok);
592 }
593 return 0;
594}
595
596static const char *token_from_item(struct trailer_item *item, char *tok)
597{
598 if (item->conf.key)
599 return item->conf.key;
600 if (tok)
601 return tok;
602 return item->conf.name;
603}
604
605static struct trailer_item *new_trailer_item(struct trailer_item *conf_item,
606 char *tok, char *val)
607{
608 struct trailer_item *new = xcalloc(sizeof(*new), 1);
85039fb6 609 new->value = val ? val : xstrdup("");
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610
611 if (conf_item) {
612 duplicate_conf(&new->conf, &conf_item->conf);
613 new->token = xstrdup(token_from_item(conf_item, tok));
614 free(tok);
615 } else {
616 duplicate_conf(&new->conf, &default_conf_info);
617 new->token = tok;
618 }
619
620 return new;
621}
622
623static int token_matches_item(const char *tok, struct trailer_item *item, int tok_len)
624{
625 if (!strncasecmp(tok, item->conf.name, tok_len))
626 return 1;
627 return item->conf.key ? !strncasecmp(tok, item->conf.key, tok_len) : 0;
628}
629
630static struct trailer_item *create_trailer_item(const char *string)
631{
632 struct strbuf tok = STRBUF_INIT;
633 struct strbuf val = STRBUF_INIT;
634 struct trailer_item *item;
635 int tok_len;
636
637 if (parse_trailer(&tok, &val, string))
638 return NULL;
639
640 tok_len = token_len_without_separator(tok.buf, tok.len);
641
642 /* Lookup if the token matches something in the config */
643 for (item = first_conf_item; item; item = item->next) {
644 if (token_matches_item(tok.buf, item, tok_len))
645 return new_trailer_item(item,
646 strbuf_detach(&tok, NULL),
647 strbuf_detach(&val, NULL));
648 }
649
650 return new_trailer_item(NULL,
651 strbuf_detach(&tok, NULL),
652 strbuf_detach(&val, NULL));
653}
654
655static void add_trailer_item(struct trailer_item **first,
656 struct trailer_item **last,
657 struct trailer_item *new)
658{
659 if (!new)
660 return;
661 if (!*last) {
662 *first = new;
663 *last = new;
664 } else {
665 (*last)->next = new;
666 new->previous = *last;
667 *last = new;
668 }
669}
670
671static struct trailer_item *process_command_line_args(struct string_list *trailers)
672{
673 struct trailer_item *arg_tok_first = NULL;
674 struct trailer_item *arg_tok_last = NULL;
675 struct string_list_item *tr;
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676 struct trailer_item *item;
677
678 /* Add a trailer item for each configured trailer with a command */
679 for (item = first_conf_item; item; item = item->next) {
680 if (item->conf.command) {
681 struct trailer_item *new = new_trailer_item(item, NULL, NULL);
682 add_trailer_item(&arg_tok_first, &arg_tok_last, new);
683 }
684 }
f0a90b4e 685
85039fb6 686 /* Add a trailer item for each trailer on the command line */
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687 for_each_string_list_item(tr, trailers) {
688 struct trailer_item *new = create_trailer_item(tr->string);
689 add_trailer_item(&arg_tok_first, &arg_tok_last, new);
690 }
691
692 return arg_tok_first;
693}
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CC
694
695static struct strbuf **read_input_file(const char *file)
696{
697 struct strbuf **lines;
698 struct strbuf sb = STRBUF_INIT;
699
700 if (file) {
701 if (strbuf_read_file(&sb, file, 0) < 0)
702 die_errno(_("could not read input file '%s'"), file);
703 } else {
704 if (strbuf_read(&sb, fileno(stdin), 0) < 0)
705 die_errno(_("could not read from stdin"));
706 }
707
708 lines = strbuf_split(&sb, '\n');
709
710 strbuf_release(&sb);
711
712 return lines;
713}
714
715/*
716 * Return the (0 based) index of the start of the patch or the line
717 * count if there is no patch in the message.
718 */
719static int find_patch_start(struct strbuf **lines, int count)
720{
721 int i;
722
723 /* Get the start of the patch part if any */
724 for (i = 0; i < count; i++) {
725 if (starts_with(lines[i]->buf, "---"))
726 return i;
727 }
728
729 return count;
730}
731
732/*
733 * Return the (0 based) index of the first trailer line or count if
734 * there are no trailers. Trailers are searched only in the lines from
735 * index (count - 1) down to index 0.
736 */
737static int find_trailer_start(struct strbuf **lines, int count)
738{
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739 int start, end_of_title, only_spaces = 1;
740
741 /* The first paragraph is the title and cannot be trailers */
742 for (start = 0; start < count; start++) {
743 if (lines[start]->buf[0] == comment_line_char)
744 continue;
745 if (contains_only_spaces(lines[start]->buf))
746 break;
747 }
748 end_of_title = start;
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749
750 /*
751 * Get the start of the trailers by looking starting from the end
752 * for a line with only spaces before lines with one separator.
753 */
5c99995d 754 for (start = count - 1; start >= end_of_title; start--) {
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755 if (lines[start]->buf[0] == comment_line_char)
756 continue;
757 if (contains_only_spaces(lines[start]->buf)) {
758 if (only_spaces)
759 continue;
760 return start + 1;
761 }
762 if (strcspn(lines[start]->buf, separators) < lines[start]->len) {
763 if (only_spaces)
764 only_spaces = 0;
765 continue;
766 }
767 return count;
768 }
769
770 return only_spaces ? count : 0;
771}
772
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773/* Get the index of the end of the trailers */
774static int find_trailer_end(struct strbuf **lines, int patch_start)
775{
776 struct strbuf sb = STRBUF_INIT;
777 int i, ignore_bytes;
778
779 for (i = 0; i < patch_start; i++)
780 strbuf_addbuf(&sb, lines[i]);
781 ignore_bytes = ignore_non_trailer(&sb);
782 strbuf_release(&sb);
783 for (i = patch_start - 1; i >= 0 && ignore_bytes > 0; i--)
784 ignore_bytes -= lines[i]->len;
785
786 return i + 1;
787}
788
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789static int has_blank_line_before(struct strbuf **lines, int start)
790{
791 for (;start >= 0; start--) {
792 if (lines[start]->buf[0] == comment_line_char)
793 continue;
794 return contains_only_spaces(lines[start]->buf);
795 }
796 return 0;
797}
798
d0d2344a 799static void print_lines(FILE *outfile, struct strbuf **lines, int start, int end)
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800{
801 int i;
802 for (i = start; lines[i] && i < end; i++)
d0d2344a 803 fprintf(outfile, "%s", lines[i]->buf);
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804}
805
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806static int process_input_file(FILE *outfile,
807 struct strbuf **lines,
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808 struct trailer_item **in_tok_first,
809 struct trailer_item **in_tok_last)
810{
811 int count = 0;
61cfef4c 812 int patch_start, trailer_start, trailer_end, i;
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813
814 /* Get the line count */
815 while (lines[count])
816 count++;
817
818 patch_start = find_patch_start(lines, count);
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819 trailer_end = find_trailer_end(lines, patch_start);
820 trailer_start = find_trailer_start(lines, trailer_end);
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821
822 /* Print lines before the trailers as is */
d0d2344a 823 print_lines(outfile, lines, 0, trailer_start);
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824
825 if (!has_blank_line_before(lines, trailer_start - 1))
d0d2344a 826 fprintf(outfile, "\n");
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827
828 /* Parse trailer lines */
61cfef4c 829 for (i = trailer_start; i < trailer_end; i++) {
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830 if (lines[i]->buf[0] != comment_line_char) {
831 struct trailer_item *new = create_trailer_item(lines[i]->buf);
832 add_trailer_item(in_tok_first, in_tok_last, new);
833 }
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834 }
835
61cfef4c 836 return trailer_end;
2013d850 837}
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838
839static void free_all(struct trailer_item **first)
840{
841 while (*first) {
842 struct trailer_item *item = remove_first(first);
843 free_trailer_item(item);
844 }
845}
846
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847static struct tempfile trailers_tempfile;
848
849static FILE *create_in_place_tempfile(const char *file)
850{
851 struct stat st;
852 struct strbuf template = STRBUF_INIT;
853 const char *tail;
854 FILE *outfile;
855
856 if (stat(file, &st))
857 die_errno(_("could not stat %s"), file);
858 if (!S_ISREG(st.st_mode))
859 die(_("file %s is not a regular file"), file);
860 if (!(st.st_mode & S_IWUSR))
861 die(_("file %s is not writable by user"), file);
862
863 /* Create temporary file in the same directory as the original */
864 tail = strrchr(file, '/');
865 if (tail != NULL)
866 strbuf_add(&template, file, tail - file + 1);
867 strbuf_addstr(&template, "git-interpret-trailers-XXXXXX");
868
869 xmks_tempfile_m(&trailers_tempfile, template.buf, st.st_mode);
870 strbuf_release(&template);
871 outfile = fdopen_tempfile(&trailers_tempfile, "w");
872 if (!outfile)
873 die_errno(_("could not open temporary file"));
874
875 return outfile;
876}
877
878void process_trailers(const char *file, int in_place, int trim_empty, struct string_list *trailers)
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879{
880 struct trailer_item *in_tok_first = NULL;
881 struct trailer_item *in_tok_last = NULL;
882 struct trailer_item *arg_tok_first;
883 struct strbuf **lines;
61cfef4c 884 int trailer_end;
d0d2344a 885 FILE *outfile = stdout;
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886
887 /* Default config must be setup first */
888 git_config(git_trailer_default_config, NULL);
889 git_config(git_trailer_config, NULL);
890
891 lines = read_input_file(file);
892
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893 if (in_place)
894 outfile = create_in_place_tempfile(file);
895
b1d78d77 896 /* Print the lines before the trailers */
d0d2344a 897 trailer_end = process_input_file(outfile, lines, &in_tok_first, &in_tok_last);
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898
899 arg_tok_first = process_command_line_args(trailers);
900
901 process_trailers_lists(&in_tok_first, &in_tok_last, &arg_tok_first);
902
d0d2344a 903 print_all(outfile, in_tok_first, trim_empty);
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904
905 free_all(&in_tok_first);
906
907 /* Print the lines after the trailers as is */
d0d2344a 908 print_lines(outfile, lines, trailer_end, INT_MAX);
b1d78d77 909
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910 if (in_place)
911 if (rename_tempfile(&trailers_tempfile, file))
912 die_errno(_("could not rename temporary file to %s"), file);
913
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914 strbuf_list_free(lines);
915}