doc: describe git svn init --ignore-refs
[git/git-svn.git] / trailer.c
blob11f0b9fb40bcedbfcd3111fa8076ce0d9e1eb20f
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 static int configured;
51 #define TRAILER_ARG_STRING "$ARG"
53 static const char *git_generated_prefixes[] = {
54 "Signed-off-by: ",
55 "(cherry picked from commit ",
56 NULL
59 /* Iterate over the elements of the list. */
60 #define list_for_each_dir(pos, head, is_reverse) \
61 for (pos = is_reverse ? (head)->prev : (head)->next; \
62 pos != (head); \
63 pos = is_reverse ? pos->prev : pos->next)
65 static int after_or_end(enum action_where where)
67 return (where == WHERE_AFTER) || (where == WHERE_END);
71 * Return the length of the string not including any final
72 * punctuation. E.g., the input "Signed-off-by:" would return
73 * 13, stripping the trailing punctuation but retaining
74 * internal punctuation.
76 static size_t token_len_without_separator(const char *token, size_t len)
78 while (len > 0 && !isalnum(token[len - 1]))
79 len--;
80 return len;
83 static int same_token(struct trailer_item *a, struct arg_item *b)
85 size_t a_len, b_len, min_len;
87 if (!a->token)
88 return 0;
90 a_len = token_len_without_separator(a->token, strlen(a->token));
91 b_len = token_len_without_separator(b->token, strlen(b->token));
92 min_len = (a_len > b_len) ? b_len : a_len;
94 return !strncasecmp(a->token, b->token, min_len);
97 static int same_value(struct trailer_item *a, struct arg_item *b)
99 return !strcasecmp(a->value, b->value);
102 static int same_trailer(struct trailer_item *a, struct arg_item *b)
104 return same_token(a, b) && same_value(a, b);
107 static inline int is_blank_line(const char *str)
109 const char *s = str;
110 while (*s && *s != '\n' && isspace(*s))
111 s++;
112 return !*s || *s == '\n';
115 static inline void strbuf_replace(struct strbuf *sb, const char *a, const char *b)
117 const char *ptr = strstr(sb->buf, a);
118 if (ptr)
119 strbuf_splice(sb, ptr - sb->buf, strlen(a), b, strlen(b));
122 static void free_trailer_item(struct trailer_item *item)
124 free(item->token);
125 free(item->value);
126 free(item);
129 static void free_arg_item(struct arg_item *item)
131 free(item->conf.name);
132 free(item->conf.key);
133 free(item->conf.command);
134 free(item->token);
135 free(item->value);
136 free(item);
139 static char last_non_space_char(const char *s)
141 int i;
142 for (i = strlen(s) - 1; i >= 0; i--)
143 if (!isspace(s[i]))
144 return s[i];
145 return '\0';
148 static void print_tok_val(FILE *outfile, const char *tok, const char *val)
150 char c;
152 if (!tok) {
153 fprintf(outfile, "%s\n", val);
154 return;
157 c = last_non_space_char(tok);
158 if (!c)
159 return;
160 if (strchr(separators, c))
161 fprintf(outfile, "%s%s\n", tok, val);
162 else
163 fprintf(outfile, "%s%c %s\n", tok, separators[0], val);
166 static void print_all(FILE *outfile, struct list_head *head, int trim_empty)
168 struct list_head *pos;
169 struct trailer_item *item;
170 list_for_each(pos, head) {
171 item = list_entry(pos, struct trailer_item, list);
172 if (!trim_empty || strlen(item->value) > 0)
173 print_tok_val(outfile, item->token, item->value);
177 static struct trailer_item *trailer_from_arg(struct arg_item *arg_tok)
179 struct trailer_item *new = xcalloc(sizeof(*new), 1);
180 new->token = arg_tok->token;
181 new->value = arg_tok->value;
182 arg_tok->token = arg_tok->value = NULL;
183 free_arg_item(arg_tok);
184 return new;
187 static void add_arg_to_input_list(struct trailer_item *on_tok,
188 struct arg_item *arg_tok)
190 int aoe = after_or_end(arg_tok->conf.where);
191 struct trailer_item *to_add = trailer_from_arg(arg_tok);
192 if (aoe)
193 list_add(&to_add->list, &on_tok->list);
194 else
195 list_add_tail(&to_add->list, &on_tok->list);
198 static int check_if_different(struct trailer_item *in_tok,
199 struct arg_item *arg_tok,
200 int check_all,
201 struct list_head *head)
203 enum action_where where = arg_tok->conf.where;
204 struct list_head *next_head;
205 do {
206 if (same_trailer(in_tok, arg_tok))
207 return 0;
209 * if we want to add a trailer after another one,
210 * we have to check those before this one
212 next_head = after_or_end(where) ? in_tok->list.prev
213 : in_tok->list.next;
214 if (next_head == head)
215 break;
216 in_tok = list_entry(next_head, struct trailer_item, list);
217 } while (check_all);
218 return 1;
221 static char *apply_command(const char *command, const char *arg)
223 struct strbuf cmd = STRBUF_INIT;
224 struct strbuf buf = STRBUF_INIT;
225 struct child_process cp = CHILD_PROCESS_INIT;
226 const char *argv[] = {NULL, NULL};
227 char *result;
229 strbuf_addstr(&cmd, command);
230 if (arg)
231 strbuf_replace(&cmd, TRAILER_ARG_STRING, arg);
233 argv[0] = cmd.buf;
234 cp.argv = argv;
235 cp.env = local_repo_env;
236 cp.no_stdin = 1;
237 cp.use_shell = 1;
239 if (capture_command(&cp, &buf, 1024)) {
240 error(_("running trailer command '%s' failed"), cmd.buf);
241 strbuf_release(&buf);
242 result = xstrdup("");
243 } else {
244 strbuf_trim(&buf);
245 result = strbuf_detach(&buf, NULL);
248 strbuf_release(&cmd);
249 return result;
252 static void apply_item_command(struct trailer_item *in_tok, struct arg_item *arg_tok)
254 if (arg_tok->conf.command) {
255 const char *arg;
256 if (arg_tok->value && arg_tok->value[0]) {
257 arg = arg_tok->value;
258 } else {
259 if (in_tok && in_tok->value)
260 arg = xstrdup(in_tok->value);
261 else
262 arg = xstrdup("");
264 arg_tok->value = apply_command(arg_tok->conf.command, arg);
265 free((char *)arg);
269 static void apply_arg_if_exists(struct trailer_item *in_tok,
270 struct arg_item *arg_tok,
271 struct trailer_item *on_tok,
272 struct list_head *head)
274 switch (arg_tok->conf.if_exists) {
275 case EXISTS_DO_NOTHING:
276 free_arg_item(arg_tok);
277 break;
278 case EXISTS_REPLACE:
279 apply_item_command(in_tok, arg_tok);
280 add_arg_to_input_list(on_tok, arg_tok);
281 list_del(&in_tok->list);
282 free_trailer_item(in_tok);
283 break;
284 case EXISTS_ADD:
285 apply_item_command(in_tok, arg_tok);
286 add_arg_to_input_list(on_tok, arg_tok);
287 break;
288 case EXISTS_ADD_IF_DIFFERENT:
289 apply_item_command(in_tok, arg_tok);
290 if (check_if_different(in_tok, arg_tok, 1, head))
291 add_arg_to_input_list(on_tok, arg_tok);
292 else
293 free_arg_item(arg_tok);
294 break;
295 case EXISTS_ADD_IF_DIFFERENT_NEIGHBOR:
296 apply_item_command(in_tok, arg_tok);
297 if (check_if_different(on_tok, arg_tok, 0, head))
298 add_arg_to_input_list(on_tok, arg_tok);
299 else
300 free_arg_item(arg_tok);
301 break;
305 static void apply_arg_if_missing(struct list_head *head,
306 struct arg_item *arg_tok)
308 enum action_where where;
309 struct trailer_item *to_add;
311 switch (arg_tok->conf.if_missing) {
312 case MISSING_DO_NOTHING:
313 free_arg_item(arg_tok);
314 break;
315 case MISSING_ADD:
316 where = arg_tok->conf.where;
317 apply_item_command(NULL, arg_tok);
318 to_add = trailer_from_arg(arg_tok);
319 if (after_or_end(where))
320 list_add_tail(&to_add->list, head);
321 else
322 list_add(&to_add->list, head);
326 static int find_same_and_apply_arg(struct list_head *head,
327 struct arg_item *arg_tok)
329 struct list_head *pos;
330 struct trailer_item *in_tok;
331 struct trailer_item *on_tok;
333 enum action_where where = arg_tok->conf.where;
334 int middle = (where == WHERE_AFTER) || (where == WHERE_BEFORE);
335 int backwards = after_or_end(where);
336 struct trailer_item *start_tok;
338 if (list_empty(head))
339 return 0;
341 start_tok = list_entry(backwards ? head->prev : head->next,
342 struct trailer_item,
343 list);
345 list_for_each_dir(pos, head, backwards) {
346 in_tok = list_entry(pos, struct trailer_item, list);
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, head);
351 return 1;
353 return 0;
356 static void process_trailers_lists(struct list_head *head,
357 struct list_head *arg_head)
359 struct list_head *pos, *p;
360 struct arg_item *arg_tok;
362 list_for_each_safe(pos, p, arg_head) {
363 int applied = 0;
364 arg_tok = list_entry(pos, struct arg_item, list);
366 list_del(pos);
368 applied = find_same_and_apply_arg(head, arg_tok);
370 if (!applied)
371 apply_arg_if_missing(head, arg_tok);
375 static int set_where(struct conf_info *item, const char *value)
377 if (!strcasecmp("after", value))
378 item->where = WHERE_AFTER;
379 else if (!strcasecmp("before", value))
380 item->where = WHERE_BEFORE;
381 else if (!strcasecmp("end", value))
382 item->where = WHERE_END;
383 else if (!strcasecmp("start", value))
384 item->where = WHERE_START;
385 else
386 return -1;
387 return 0;
390 static int set_if_exists(struct conf_info *item, const char *value)
392 if (!strcasecmp("addIfDifferent", value))
393 item->if_exists = EXISTS_ADD_IF_DIFFERENT;
394 else if (!strcasecmp("addIfDifferentNeighbor", value))
395 item->if_exists = EXISTS_ADD_IF_DIFFERENT_NEIGHBOR;
396 else if (!strcasecmp("add", value))
397 item->if_exists = EXISTS_ADD;
398 else if (!strcasecmp("replace", value))
399 item->if_exists = EXISTS_REPLACE;
400 else if (!strcasecmp("doNothing", value))
401 item->if_exists = EXISTS_DO_NOTHING;
402 else
403 return -1;
404 return 0;
407 static int set_if_missing(struct conf_info *item, const char *value)
409 if (!strcasecmp("doNothing", value))
410 item->if_missing = MISSING_DO_NOTHING;
411 else if (!strcasecmp("add", value))
412 item->if_missing = MISSING_ADD;
413 else
414 return -1;
415 return 0;
418 static void duplicate_conf(struct conf_info *dst, const struct conf_info *src)
420 *dst = *src;
421 dst->name = xstrdup_or_null(src->name);
422 dst->key = xstrdup_or_null(src->key);
423 dst->command = xstrdup_or_null(src->command);
426 static struct arg_item *get_conf_item(const char *name)
428 struct list_head *pos;
429 struct arg_item *item;
431 /* Look up item with same name */
432 list_for_each(pos, &conf_head) {
433 item = list_entry(pos, struct arg_item, list);
434 if (!strcasecmp(item->conf.name, name))
435 return item;
438 /* Item does not already exists, create it */
439 item = xcalloc(sizeof(*item), 1);
440 duplicate_conf(&item->conf, &default_conf_info);
441 item->conf.name = xstrdup(name);
443 list_add_tail(&item->list, &conf_head);
445 return item;
448 enum trailer_info_type { TRAILER_KEY, TRAILER_COMMAND, TRAILER_WHERE,
449 TRAILER_IF_EXISTS, TRAILER_IF_MISSING };
451 static struct {
452 const char *name;
453 enum trailer_info_type type;
454 } trailer_config_items[] = {
455 { "key", TRAILER_KEY },
456 { "command", TRAILER_COMMAND },
457 { "where", TRAILER_WHERE },
458 { "ifexists", TRAILER_IF_EXISTS },
459 { "ifmissing", TRAILER_IF_MISSING }
462 static int git_trailer_default_config(const char *conf_key, const char *value, void *cb)
464 const char *trailer_item, *variable_name;
466 if (!skip_prefix(conf_key, "trailer.", &trailer_item))
467 return 0;
469 variable_name = strrchr(trailer_item, '.');
470 if (!variable_name) {
471 if (!strcmp(trailer_item, "where")) {
472 if (set_where(&default_conf_info, value) < 0)
473 warning(_("unknown value '%s' for key '%s'"),
474 value, conf_key);
475 } else if (!strcmp(trailer_item, "ifexists")) {
476 if (set_if_exists(&default_conf_info, value) < 0)
477 warning(_("unknown value '%s' for key '%s'"),
478 value, conf_key);
479 } else if (!strcmp(trailer_item, "ifmissing")) {
480 if (set_if_missing(&default_conf_info, value) < 0)
481 warning(_("unknown value '%s' for key '%s'"),
482 value, conf_key);
483 } else if (!strcmp(trailer_item, "separators")) {
484 separators = xstrdup(value);
487 return 0;
490 static int git_trailer_config(const char *conf_key, const char *value, void *cb)
492 const char *trailer_item, *variable_name;
493 struct arg_item *item;
494 struct conf_info *conf;
495 char *name = NULL;
496 enum trailer_info_type type;
497 int i;
499 if (!skip_prefix(conf_key, "trailer.", &trailer_item))
500 return 0;
502 variable_name = strrchr(trailer_item, '.');
503 if (!variable_name)
504 return 0;
506 variable_name++;
507 for (i = 0; i < ARRAY_SIZE(trailer_config_items); i++) {
508 if (strcmp(trailer_config_items[i].name, variable_name))
509 continue;
510 name = xstrndup(trailer_item, variable_name - trailer_item - 1);
511 type = trailer_config_items[i].type;
512 break;
515 if (!name)
516 return 0;
518 item = get_conf_item(name);
519 conf = &item->conf;
520 free(name);
522 switch (type) {
523 case TRAILER_KEY:
524 if (conf->key)
525 warning(_("more than one %s"), conf_key);
526 conf->key = xstrdup(value);
527 break;
528 case TRAILER_COMMAND:
529 if (conf->command)
530 warning(_("more than one %s"), conf_key);
531 conf->command = xstrdup(value);
532 break;
533 case TRAILER_WHERE:
534 if (set_where(conf, value))
535 warning(_("unknown value '%s' for key '%s'"), value, conf_key);
536 break;
537 case TRAILER_IF_EXISTS:
538 if (set_if_exists(conf, value))
539 warning(_("unknown value '%s' for key '%s'"), value, conf_key);
540 break;
541 case TRAILER_IF_MISSING:
542 if (set_if_missing(conf, value))
543 warning(_("unknown value '%s' for key '%s'"), value, conf_key);
544 break;
545 default:
546 die("BUG: trailer.c: unhandled type %d", type);
548 return 0;
551 static void ensure_configured(void)
553 if (configured)
554 return;
556 /* Default config must be setup first */
557 git_config(git_trailer_default_config, NULL);
558 git_config(git_trailer_config, NULL);
559 configured = 1;
562 static const char *token_from_item(struct arg_item *item, char *tok)
564 if (item->conf.key)
565 return item->conf.key;
566 if (tok)
567 return tok;
568 return item->conf.name;
571 static int token_matches_item(const char *tok, struct arg_item *item, int tok_len)
573 if (!strncasecmp(tok, item->conf.name, tok_len))
574 return 1;
575 return item->conf.key ? !strncasecmp(tok, item->conf.key, tok_len) : 0;
579 * If the given line is of the form
580 * "<token><optional whitespace><separator>..." or "<separator>...", return the
581 * location of the separator. Otherwise, return -1. The optional whitespace
582 * is allowed there primarily to allow things like "Bug #43" where <token> is
583 * "Bug" and <separator> is "#".
585 * The separator-starts-line case (in which this function returns 0) is
586 * distinguished from the non-well-formed-line case (in which this function
587 * returns -1) because some callers of this function need such a distinction.
589 static int find_separator(const char *line, const char *separators)
591 int whitespace_found = 0;
592 const char *c;
593 for (c = line; *c; c++) {
594 if (strchr(separators, *c))
595 return c - line;
596 if (!whitespace_found && (isalnum(*c) || *c == '-'))
597 continue;
598 if (c != line && (*c == ' ' || *c == '\t')) {
599 whitespace_found = 1;
600 continue;
602 break;
604 return -1;
608 * Obtain the token, value, and conf from the given trailer.
610 * separator_pos must not be 0, since the token cannot be an empty string.
612 * If separator_pos is -1, interpret the whole trailer as a token.
614 static void parse_trailer(struct strbuf *tok, struct strbuf *val,
615 const struct conf_info **conf, const char *trailer,
616 int separator_pos)
618 struct arg_item *item;
619 int tok_len;
620 struct list_head *pos;
622 if (separator_pos != -1) {
623 strbuf_add(tok, trailer, separator_pos);
624 strbuf_trim(tok);
625 strbuf_addstr(val, trailer + separator_pos + 1);
626 strbuf_trim(val);
627 } else {
628 strbuf_addstr(tok, trailer);
629 strbuf_trim(tok);
632 /* Lookup if the token matches something in the config */
633 tok_len = token_len_without_separator(tok->buf, tok->len);
634 if (conf)
635 *conf = &default_conf_info;
636 list_for_each(pos, &conf_head) {
637 item = list_entry(pos, struct arg_item, list);
638 if (token_matches_item(tok->buf, item, tok_len)) {
639 char *tok_buf = strbuf_detach(tok, NULL);
640 if (conf)
641 *conf = &item->conf;
642 strbuf_addstr(tok, token_from_item(item, tok_buf));
643 free(tok_buf);
644 break;
649 static struct trailer_item *add_trailer_item(struct list_head *head, char *tok,
650 char *val)
652 struct trailer_item *new = xcalloc(sizeof(*new), 1);
653 new->token = tok;
654 new->value = val;
655 list_add_tail(&new->list, head);
656 return new;
659 static void add_arg_item(struct list_head *arg_head, char *tok, char *val,
660 const struct conf_info *conf)
662 struct arg_item *new = xcalloc(sizeof(*new), 1);
663 new->token = tok;
664 new->value = val;
665 duplicate_conf(&new->conf, conf);
666 list_add_tail(&new->list, arg_head);
669 static void process_command_line_args(struct list_head *arg_head,
670 struct string_list *trailers)
672 struct string_list_item *tr;
673 struct arg_item *item;
674 struct strbuf tok = STRBUF_INIT;
675 struct strbuf val = STRBUF_INIT;
676 const struct conf_info *conf;
677 struct list_head *pos;
680 * In command-line arguments, '=' is accepted (in addition to the
681 * separators that are defined).
683 char *cl_separators = xstrfmt("=%s", separators);
685 /* Add an arg item for each configured trailer with a command */
686 list_for_each(pos, &conf_head) {
687 item = list_entry(pos, struct arg_item, list);
688 if (item->conf.command)
689 add_arg_item(arg_head,
690 xstrdup(token_from_item(item, NULL)),
691 xstrdup(""),
692 &item->conf);
695 /* Add an arg item for each trailer on the command line */
696 for_each_string_list_item(tr, trailers) {
697 int separator_pos = find_separator(tr->string, cl_separators);
698 if (separator_pos == 0) {
699 struct strbuf sb = STRBUF_INIT;
700 strbuf_addstr(&sb, tr->string);
701 strbuf_trim(&sb);
702 error(_("empty trailer token in trailer '%.*s'"),
703 (int) sb.len, sb.buf);
704 strbuf_release(&sb);
705 } else {
706 parse_trailer(&tok, &val, &conf, tr->string,
707 separator_pos);
708 add_arg_item(arg_head,
709 strbuf_detach(&tok, NULL),
710 strbuf_detach(&val, NULL),
711 conf);
715 free(cl_separators);
718 static void read_input_file(struct strbuf *sb, const char *file)
720 if (file) {
721 if (strbuf_read_file(sb, file, 0) < 0)
722 die_errno(_("could not read input file '%s'"), file);
723 } else {
724 if (strbuf_read(sb, fileno(stdin), 0) < 0)
725 die_errno(_("could not read from stdin"));
729 static const char *next_line(const char *str)
731 const char *nl = strchrnul(str, '\n');
732 return nl + !!*nl;
736 * Return the position of the start of the last line. If len is 0, return -1.
738 static int last_line(const char *buf, size_t len)
740 int i;
741 if (len == 0)
742 return -1;
743 if (len == 1)
744 return 0;
746 * Skip the last character (in addition to the null terminator),
747 * because if the last character is a newline, it is considered as part
748 * of the last line anyway.
750 i = len - 2;
752 for (; i >= 0; i--) {
753 if (buf[i] == '\n')
754 return i + 1;
756 return 0;
760 * Return the position of the start of the patch or the length of str if there
761 * is no patch in the message.
763 static int find_patch_start(const char *str)
765 const char *s;
767 for (s = str; *s; s = next_line(s)) {
768 if (starts_with(s, "---"))
769 return s - str;
772 return s - str;
776 * Return the position of the first trailer line or len if there are no
777 * trailers.
779 static int find_trailer_start(const char *buf, size_t len)
781 const char *s;
782 int end_of_title, l, only_spaces = 1;
783 int recognized_prefix = 0, trailer_lines = 0, non_trailer_lines = 0;
785 * Number of possible continuation lines encountered. This will be
786 * reset to 0 if we encounter a trailer (since those lines are to be
787 * considered continuations of that trailer), and added to
788 * non_trailer_lines if we encounter a non-trailer (since those lines
789 * are to be considered non-trailers).
791 int possible_continuation_lines = 0;
793 /* The first paragraph is the title and cannot be trailers */
794 for (s = buf; s < buf + len; s = next_line(s)) {
795 if (s[0] == comment_line_char)
796 continue;
797 if (is_blank_line(s))
798 break;
800 end_of_title = s - buf;
803 * Get the start of the trailers by looking starting from the end for a
804 * blank line before a set of non-blank lines that (i) are all
805 * trailers, or (ii) contains at least one Git-generated trailer and
806 * consists of at least 25% trailers.
808 for (l = last_line(buf, len);
809 l >= end_of_title;
810 l = last_line(buf, l)) {
811 const char *bol = buf + l;
812 const char **p;
813 int separator_pos;
815 if (bol[0] == comment_line_char) {
816 non_trailer_lines += possible_continuation_lines;
817 possible_continuation_lines = 0;
818 continue;
820 if (is_blank_line(bol)) {
821 if (only_spaces)
822 continue;
823 non_trailer_lines += possible_continuation_lines;
824 if (recognized_prefix &&
825 trailer_lines * 3 >= non_trailer_lines)
826 return next_line(bol) - buf;
827 else if (trailer_lines && !non_trailer_lines)
828 return next_line(bol) - buf;
829 return len;
831 only_spaces = 0;
833 for (p = git_generated_prefixes; *p; p++) {
834 if (starts_with(bol, *p)) {
835 trailer_lines++;
836 possible_continuation_lines = 0;
837 recognized_prefix = 1;
838 goto continue_outer_loop;
842 separator_pos = find_separator(bol, separators);
843 if (separator_pos >= 1 && !isspace(bol[0])) {
844 struct list_head *pos;
846 trailer_lines++;
847 possible_continuation_lines = 0;
848 if (recognized_prefix)
849 continue;
850 list_for_each(pos, &conf_head) {
851 struct arg_item *item;
852 item = list_entry(pos, struct arg_item, list);
853 if (token_matches_item(bol, item,
854 separator_pos)) {
855 recognized_prefix = 1;
856 break;
859 } else if (isspace(bol[0]))
860 possible_continuation_lines++;
861 else {
862 non_trailer_lines++;
863 non_trailer_lines += possible_continuation_lines;
864 possible_continuation_lines = 0;
866 continue_outer_loop:
870 return len;
873 /* Return the position of the end of the trailers. */
874 static int find_trailer_end(const char *buf, size_t len)
876 return len - ignore_non_trailer(buf, len);
879 static int ends_with_blank_line(const char *buf, size_t len)
881 int ll = last_line(buf, len);
882 if (ll < 0)
883 return 0;
884 return is_blank_line(buf + ll);
887 static int process_input_file(FILE *outfile,
888 const char *str,
889 struct list_head *head)
891 struct trailer_info info;
892 struct strbuf tok = STRBUF_INIT;
893 struct strbuf val = STRBUF_INIT;
894 int i;
896 trailer_info_get(&info, str);
898 /* Print lines before the trailers as is */
899 fwrite(str, 1, info.trailer_start - str, outfile);
901 if (!info.blank_line_before_trailer)
902 fprintf(outfile, "\n");
904 for (i = 0; i < info.trailer_nr; i++) {
905 int separator_pos;
906 char *trailer = info.trailers[i];
907 if (trailer[0] == comment_line_char)
908 continue;
909 separator_pos = find_separator(trailer, separators);
910 if (separator_pos >= 1) {
911 parse_trailer(&tok, &val, NULL, trailer,
912 separator_pos);
913 add_trailer_item(head,
914 strbuf_detach(&tok, NULL),
915 strbuf_detach(&val, NULL));
916 } else {
917 strbuf_addstr(&val, trailer);
918 strbuf_strip_suffix(&val, "\n");
919 add_trailer_item(head,
920 NULL,
921 strbuf_detach(&val, NULL));
925 trailer_info_release(&info);
927 return info.trailer_end - str;
930 static void free_all(struct list_head *head)
932 struct list_head *pos, *p;
933 list_for_each_safe(pos, p, head) {
934 list_del(pos);
935 free_trailer_item(list_entry(pos, struct trailer_item, list));
939 static struct tempfile trailers_tempfile;
941 static FILE *create_in_place_tempfile(const char *file)
943 struct stat st;
944 struct strbuf template = STRBUF_INIT;
945 const char *tail;
946 FILE *outfile;
948 if (stat(file, &st))
949 die_errno(_("could not stat %s"), file);
950 if (!S_ISREG(st.st_mode))
951 die(_("file %s is not a regular file"), file);
952 if (!(st.st_mode & S_IWUSR))
953 die(_("file %s is not writable by user"), file);
955 /* Create temporary file in the same directory as the original */
956 tail = strrchr(file, '/');
957 if (tail != NULL)
958 strbuf_add(&template, file, tail - file + 1);
959 strbuf_addstr(&template, "git-interpret-trailers-XXXXXX");
961 xmks_tempfile_m(&trailers_tempfile, template.buf, st.st_mode);
962 strbuf_release(&template);
963 outfile = fdopen_tempfile(&trailers_tempfile, "w");
964 if (!outfile)
965 die_errno(_("could not open temporary file"));
967 return outfile;
970 void process_trailers(const char *file, int in_place, int trim_empty, struct string_list *trailers)
972 LIST_HEAD(head);
973 LIST_HEAD(arg_head);
974 struct strbuf sb = STRBUF_INIT;
975 int trailer_end;
976 FILE *outfile = stdout;
978 ensure_configured();
980 read_input_file(&sb, file);
982 if (in_place)
983 outfile = create_in_place_tempfile(file);
985 /* Print the lines before the trailers */
986 trailer_end = process_input_file(outfile, sb.buf, &head);
988 process_command_line_args(&arg_head, trailers);
990 process_trailers_lists(&head, &arg_head);
992 print_all(outfile, &head, trim_empty);
994 free_all(&head);
996 /* Print the lines after the trailers as is */
997 fwrite(sb.buf + trailer_end, 1, sb.len - trailer_end, outfile);
999 if (in_place)
1000 if (rename_tempfile(&trailers_tempfile, file))
1001 die_errno(_("could not rename temporary file to %s"), file);
1003 strbuf_release(&sb);
1006 void trailer_info_get(struct trailer_info *info, const char *str)
1008 int patch_start, trailer_end, trailer_start;
1009 struct strbuf **trailer_lines, **ptr;
1010 char **trailer_strings = NULL;
1011 size_t nr = 0, alloc = 0;
1012 char **last = NULL;
1014 ensure_configured();
1016 patch_start = find_patch_start(str);
1017 trailer_end = find_trailer_end(str, patch_start);
1018 trailer_start = find_trailer_start(str, trailer_end);
1020 trailer_lines = strbuf_split_buf(str + trailer_start,
1021 trailer_end - trailer_start,
1022 '\n',
1024 for (ptr = trailer_lines; *ptr; ptr++) {
1025 if (last && isspace((*ptr)->buf[0])) {
1026 struct strbuf sb = STRBUF_INIT;
1027 strbuf_attach(&sb, *last, strlen(*last), strlen(*last));
1028 strbuf_addbuf(&sb, *ptr);
1029 *last = strbuf_detach(&sb, NULL);
1030 continue;
1032 ALLOC_GROW(trailer_strings, nr + 1, alloc);
1033 trailer_strings[nr] = strbuf_detach(*ptr, NULL);
1034 last = find_separator(trailer_strings[nr], separators) >= 1
1035 ? &trailer_strings[nr]
1036 : NULL;
1037 nr++;
1039 strbuf_list_free(trailer_lines);
1041 info->blank_line_before_trailer = ends_with_blank_line(str,
1042 trailer_start);
1043 info->trailer_start = str + trailer_start;
1044 info->trailer_end = str + trailer_end;
1045 info->trailers = trailer_strings;
1046 info->trailer_nr = nr;
1049 void trailer_info_release(struct trailer_info *info)
1051 int i;
1052 for (i = 0; i < info->trailer_nr; i++)
1053 free(info->trailers[i]);
1054 free(info->trailers);