A bit of updates post -rc0
[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"
e1f89863 5#include "tempfile.h"
b1d78d77 6#include "trailer.h"
8966a394 7#include "list.h"
9385b5d7
CC
8/*
9 * Copyright (c) 2013, 2014 Christian Couder <chriscool@tuxfamily.org>
10 */
11
12enum action_where { WHERE_END, WHERE_AFTER, WHERE_BEFORE, WHERE_START };
13enum action_if_exists { EXISTS_ADD_IF_DIFFERENT_NEIGHBOR, EXISTS_ADD_IF_DIFFERENT,
14 EXISTS_ADD, EXISTS_REPLACE, EXISTS_DO_NOTHING };
15enum action_if_missing { MISSING_ADD, MISSING_DO_NOTHING };
16
17struct 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;
24};
25
26static struct conf_info default_conf_info;
27
28struct trailer_item {
8966a394 29 struct list_head list;
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30 /*
31 * If this is not a trailer line, the line is stored in value
32 * (excluding the terminating newline) and token is NULL.
33 */
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34 char *token;
35 char *value;
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36};
37
38struct arg_item {
39 struct list_head list;
40 char *token;
41 char *value;
9385b5d7
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42 struct conf_info conf;
43};
44
8966a394 45static LIST_HEAD(conf_head);
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46
47static char *separators = ":";
48
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49#define TRAILER_ARG_STRING "$ARG"
50
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51static const char *git_generated_prefixes[] = {
52 "Signed-off-by: ",
53 "(cherry picked from commit ",
54 NULL
55};
56
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57/* Iterate over the elements of the list. */
58#define list_for_each_dir(pos, head, is_reverse) \
59 for (pos = is_reverse ? (head)->prev : (head)->next; \
60 pos != (head); \
61 pos = is_reverse ? pos->prev : pos->next)
62
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63static int after_or_end(enum action_where where)
64{
65 return (where == WHERE_AFTER) || (where == WHERE_END);
66}
67
68/*
69 * Return the length of the string not including any final
70 * punctuation. E.g., the input "Signed-off-by:" would return
71 * 13, stripping the trailing punctuation but retaining
72 * internal punctuation.
73 */
74static size_t token_len_without_separator(const char *token, size_t len)
75{
76 while (len > 0 && !isalnum(token[len - 1]))
77 len--;
78 return len;
79}
80
cc71b0de 81static int same_token(struct trailer_item *a, struct arg_item *b)
9385b5d7 82{
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83 size_t a_len, b_len, min_len;
84
85 if (!a->token)
86 return 0;
87
88 a_len = token_len_without_separator(a->token, strlen(a->token));
89 b_len = token_len_without_separator(b->token, strlen(b->token));
90 min_len = (a_len > b_len) ? b_len : a_len;
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91
92 return !strncasecmp(a->token, b->token, min_len);
93}
94
cc71b0de 95static int same_value(struct trailer_item *a, struct arg_item *b)
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CC
96{
97 return !strcasecmp(a->value, b->value);
98}
99
cc71b0de 100static int same_trailer(struct trailer_item *a, struct arg_item *b)
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101{
102 return same_token(a, b) && same_value(a, b);
103}
4103818d 104
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105static inline int contains_only_spaces(const char *str)
106{
107 const char *s = str;
108 while (*s && isspace(*s))
109 s++;
110 return !*s;
111}
112
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113static inline void strbuf_replace(struct strbuf *sb, const char *a, const char *b)
114{
115 const char *ptr = strstr(sb->buf, a);
116 if (ptr)
117 strbuf_splice(sb, ptr - sb->buf, strlen(a), b, strlen(b));
118}
119
4103818d 120static void free_trailer_item(struct trailer_item *item)
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121{
122 free(item->token);
123 free(item->value);
124 free(item);
125}
126
127static void free_arg_item(struct arg_item *item)
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128{
129 free(item->conf.name);
130 free(item->conf.key);
131 free(item->conf.command);
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132 free(item->token);
133 free(item->value);
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134 free(item);
135}
136
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137static char last_non_space_char(const char *s)
138{
139 int i;
140 for (i = strlen(s) - 1; i >= 0; i--)
141 if (!isspace(s[i]))
142 return s[i];
143 return '\0';
144}
145
d0d2344a 146static void print_tok_val(FILE *outfile, const char *tok, const char *val)
b1d78d77 147{
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148 char c;
149
150 if (!tok) {
151 fprintf(outfile, "%s\n", val);
152 return;
153 }
154
155 c = last_non_space_char(tok);
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CC
156 if (!c)
157 return;
158 if (strchr(separators, c))
d0d2344a 159 fprintf(outfile, "%s%s\n", tok, val);
b1d78d77 160 else
d0d2344a 161 fprintf(outfile, "%s%c %s\n", tok, separators[0], val);
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162}
163
8966a394 164static void print_all(FILE *outfile, struct list_head *head, int trim_empty)
b1d78d77 165{
8966a394 166 struct list_head *pos;
b1d78d77 167 struct trailer_item *item;
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168 list_for_each(pos, head) {
169 item = list_entry(pos, struct trailer_item, list);
b1d78d77 170 if (!trim_empty || strlen(item->value) > 0)
d0d2344a 171 print_tok_val(outfile, item->token, item->value);
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CC
172 }
173}
174
cc71b0de 175static struct trailer_item *trailer_from_arg(struct arg_item *arg_tok)
4103818d 176{
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177 struct trailer_item *new = xcalloc(sizeof(*new), 1);
178 new->token = arg_tok->token;
179 new->value = arg_tok->value;
180 arg_tok->token = arg_tok->value = NULL;
181 free_arg_item(arg_tok);
182 return new;
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183}
184
185static void add_arg_to_input_list(struct trailer_item *on_tok,
cc71b0de 186 struct arg_item *arg_tok)
8966a394 187{
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188 int aoe = after_or_end(arg_tok->conf.where);
189 struct trailer_item *to_add = trailer_from_arg(arg_tok);
190 if (aoe)
191 list_add(&to_add->list, &on_tok->list);
8966a394 192 else
cc71b0de 193 list_add_tail(&to_add->list, &on_tok->list);
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194}
195
196static int check_if_different(struct trailer_item *in_tok,
cc71b0de 197 struct arg_item *arg_tok,
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198 int check_all,
199 struct list_head *head)
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200{
201 enum action_where where = arg_tok->conf.where;
8966a394 202 struct list_head *next_head;
4103818d 203 do {
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204 if (same_trailer(in_tok, arg_tok))
205 return 0;
206 /*
207 * if we want to add a trailer after another one,
208 * we have to check those before this one
209 */
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210 next_head = after_or_end(where) ? in_tok->list.prev
211 : in_tok->list.next;
212 if (next_head == head)
213 break;
214 in_tok = list_entry(next_head, struct trailer_item, list);
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215 } while (check_all);
216 return 1;
217}
218
d65fd424 219static char *apply_command(const char *command, const char *arg)
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CC
220{
221 struct strbuf cmd = STRBUF_INIT;
222 struct strbuf buf = STRBUF_INIT;
b226293b 223 struct child_process cp = CHILD_PROCESS_INIT;
85039fb6 224 const char *argv[] = {NULL, NULL};
d65fd424 225 char *result;
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226
227 strbuf_addstr(&cmd, command);
228 if (arg)
229 strbuf_replace(&cmd, TRAILER_ARG_STRING, arg);
230
231 argv[0] = cmd.buf;
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232 cp.argv = argv;
233 cp.env = local_repo_env;
234 cp.no_stdin = 1;
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235 cp.use_shell = 1;
236
c5eadcaa 237 if (capture_command(&cp, &buf, 1024)) {
13ad56f8 238 error(_("running trailer command '%s' failed"), cmd.buf);
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239 strbuf_release(&buf);
240 result = xstrdup("");
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241 } else {
242 strbuf_trim(&buf);
85039fb6 243 result = strbuf_detach(&buf, NULL);
c5eadcaa 244 }
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245
246 strbuf_release(&cmd);
247 return result;
248}
249
cc71b0de 250static void apply_item_command(struct trailer_item *in_tok, struct arg_item *arg_tok)
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251{
252 if (arg_tok->conf.command) {
253 const char *arg;
254 if (arg_tok->value && arg_tok->value[0]) {
255 arg = arg_tok->value;
256 } else {
257 if (in_tok && in_tok->value)
258 arg = xstrdup(in_tok->value);
259 else
260 arg = xstrdup("");
261 }
262 arg_tok->value = apply_command(arg_tok->conf.command, arg);
263 free((char *)arg);
264 }
265}
266
4103818d 267static void apply_arg_if_exists(struct trailer_item *in_tok,
cc71b0de 268 struct arg_item *arg_tok,
4103818d 269 struct trailer_item *on_tok,
8966a394 270 struct list_head *head)
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271{
272 switch (arg_tok->conf.if_exists) {
273 case EXISTS_DO_NOTHING:
cc71b0de 274 free_arg_item(arg_tok);
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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 list_del(&in_tok->list);
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280 free_trailer_item(in_tok);
281 break;
282 case EXISTS_ADD:
85039fb6 283 apply_item_command(in_tok, arg_tok);
8966a394 284 add_arg_to_input_list(on_tok, arg_tok);
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285 break;
286 case EXISTS_ADD_IF_DIFFERENT:
85039fb6 287 apply_item_command(in_tok, arg_tok);
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288 if (check_if_different(in_tok, arg_tok, 1, head))
289 add_arg_to_input_list(on_tok, arg_tok);
4103818d 290 else
cc71b0de 291 free_arg_item(arg_tok);
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292 break;
293 case EXISTS_ADD_IF_DIFFERENT_NEIGHBOR:
85039fb6 294 apply_item_command(in_tok, arg_tok);
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295 if (check_if_different(on_tok, arg_tok, 0, head))
296 add_arg_to_input_list(on_tok, arg_tok);
4103818d 297 else
cc71b0de 298 free_arg_item(arg_tok);
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CC
299 break;
300 }
301}
302
8966a394 303static void apply_arg_if_missing(struct list_head *head,
cc71b0de 304 struct arg_item *arg_tok)
4103818d 305{
4103818d 306 enum action_where where;
cc71b0de 307 struct trailer_item *to_add;
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308
309 switch (arg_tok->conf.if_missing) {
310 case MISSING_DO_NOTHING:
cc71b0de 311 free_arg_item(arg_tok);
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312 break;
313 case MISSING_ADD:
314 where = arg_tok->conf.where;
85039fb6 315 apply_item_command(NULL, arg_tok);
cc71b0de 316 to_add = trailer_from_arg(arg_tok);
8966a394 317 if (after_or_end(where))
cc71b0de 318 list_add_tail(&to_add->list, head);
8966a394 319 else
cc71b0de 320 list_add(&to_add->list, head);
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CC
321 }
322}
323
8966a394 324static int find_same_and_apply_arg(struct list_head *head,
cc71b0de 325 struct arg_item *arg_tok)
4103818d 326{
8966a394 327 struct list_head *pos;
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328 struct trailer_item *in_tok;
329 struct trailer_item *on_tok;
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330
331 enum action_where where = arg_tok->conf.where;
332 int middle = (where == WHERE_AFTER) || (where == WHERE_BEFORE);
333 int backwards = after_or_end(where);
8966a394 334 struct trailer_item *start_tok;
4103818d 335
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336 if (list_empty(head))
337 return 0;
4103818d 338
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339 start_tok = list_entry(backwards ? head->prev : head->next,
340 struct trailer_item,
341 list);
342
343 list_for_each_dir(pos, head, backwards) {
344 in_tok = list_entry(pos, struct trailer_item, list);
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CC
345 if (!same_token(in_tok, arg_tok))
346 continue;
347 on_tok = middle ? in_tok : start_tok;
8966a394 348 apply_arg_if_exists(in_tok, arg_tok, on_tok, head);
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349 return 1;
350 }
351 return 0;
352}
353
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354static void process_trailers_lists(struct list_head *head,
355 struct list_head *arg_head)
4103818d 356{
8966a394 357 struct list_head *pos, *p;
cc71b0de 358 struct arg_item *arg_tok;
4103818d 359
8966a394 360 list_for_each_safe(pos, p, arg_head) {
4103818d 361 int applied = 0;
cc71b0de 362 arg_tok = list_entry(pos, struct arg_item, list);
4103818d 363
8966a394 364 list_del(pos);
4103818d 365
8966a394 366 applied = find_same_and_apply_arg(head, arg_tok);
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367
368 if (!applied)
8966a394 369 apply_arg_if_missing(head, arg_tok);
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370 }
371}
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372
373static int set_where(struct conf_info *item, const char *value)
374{
375 if (!strcasecmp("after", value))
376 item->where = WHERE_AFTER;
377 else if (!strcasecmp("before", value))
378 item->where = WHERE_BEFORE;
379 else if (!strcasecmp("end", value))
380 item->where = WHERE_END;
381 else if (!strcasecmp("start", value))
382 item->where = WHERE_START;
383 else
384 return -1;
385 return 0;
386}
387
388static int set_if_exists(struct conf_info *item, const char *value)
389{
390 if (!strcasecmp("addIfDifferent", value))
391 item->if_exists = EXISTS_ADD_IF_DIFFERENT;
392 else if (!strcasecmp("addIfDifferentNeighbor", value))
393 item->if_exists = EXISTS_ADD_IF_DIFFERENT_NEIGHBOR;
394 else if (!strcasecmp("add", value))
395 item->if_exists = EXISTS_ADD;
396 else if (!strcasecmp("replace", value))
397 item->if_exists = EXISTS_REPLACE;
398 else if (!strcasecmp("doNothing", value))
399 item->if_exists = EXISTS_DO_NOTHING;
400 else
401 return -1;
402 return 0;
403}
404
405static int set_if_missing(struct conf_info *item, const char *value)
406{
407 if (!strcasecmp("doNothing", value))
408 item->if_missing = MISSING_DO_NOTHING;
409 else if (!strcasecmp("add", value))
410 item->if_missing = MISSING_ADD;
411 else
412 return -1;
413 return 0;
414}
415
d65fd424 416static void duplicate_conf(struct conf_info *dst, const struct conf_info *src)
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CC
417{
418 *dst = *src;
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419 dst->name = xstrdup_or_null(src->name);
420 dst->key = xstrdup_or_null(src->key);
421 dst->command = xstrdup_or_null(src->command);
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CC
422}
423
cc71b0de 424static struct arg_item *get_conf_item(const char *name)
46a0613f 425{
8966a394 426 struct list_head *pos;
cc71b0de 427 struct arg_item *item;
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428
429 /* Look up item with same name */
8966a394 430 list_for_each(pos, &conf_head) {
cc71b0de 431 item = list_entry(pos, struct arg_item, list);
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432 if (!strcasecmp(item->conf.name, name))
433 return item;
434 }
435
436 /* Item does not already exists, create it */
cc71b0de 437 item = xcalloc(sizeof(*item), 1);
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438 duplicate_conf(&item->conf, &default_conf_info);
439 item->conf.name = xstrdup(name);
440
8966a394 441 list_add_tail(&item->list, &conf_head);
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442
443 return item;
444}
445
446enum trailer_info_type { TRAILER_KEY, TRAILER_COMMAND, TRAILER_WHERE,
447 TRAILER_IF_EXISTS, TRAILER_IF_MISSING };
448
449static struct {
450 const char *name;
451 enum trailer_info_type type;
452} trailer_config_items[] = {
453 { "key", TRAILER_KEY },
454 { "command", TRAILER_COMMAND },
455 { "where", TRAILER_WHERE },
456 { "ifexists", TRAILER_IF_EXISTS },
457 { "ifmissing", TRAILER_IF_MISSING }
458};
459
460static int git_trailer_default_config(const char *conf_key, const char *value, void *cb)
461{
462 const char *trailer_item, *variable_name;
463
464 if (!skip_prefix(conf_key, "trailer.", &trailer_item))
465 return 0;
466
467 variable_name = strrchr(trailer_item, '.');
468 if (!variable_name) {
469 if (!strcmp(trailer_item, "where")) {
470 if (set_where(&default_conf_info, value) < 0)
471 warning(_("unknown value '%s' for key '%s'"),
472 value, conf_key);
473 } else if (!strcmp(trailer_item, "ifexists")) {
474 if (set_if_exists(&default_conf_info, value) < 0)
475 warning(_("unknown value '%s' for key '%s'"),
476 value, conf_key);
477 } else if (!strcmp(trailer_item, "ifmissing")) {
478 if (set_if_missing(&default_conf_info, value) < 0)
479 warning(_("unknown value '%s' for key '%s'"),
480 value, conf_key);
481 } else if (!strcmp(trailer_item, "separators")) {
482 separators = xstrdup(value);
483 }
484 }
485 return 0;
486}
487
488static int git_trailer_config(const char *conf_key, const char *value, void *cb)
489{
490 const char *trailer_item, *variable_name;
cc71b0de 491 struct arg_item *item;
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492 struct conf_info *conf;
493 char *name = NULL;
494 enum trailer_info_type type;
495 int i;
496
497 if (!skip_prefix(conf_key, "trailer.", &trailer_item))
498 return 0;
499
500 variable_name = strrchr(trailer_item, '.');
501 if (!variable_name)
502 return 0;
503
504 variable_name++;
505 for (i = 0; i < ARRAY_SIZE(trailer_config_items); i++) {
506 if (strcmp(trailer_config_items[i].name, variable_name))
507 continue;
508 name = xstrndup(trailer_item, variable_name - trailer_item - 1);
509 type = trailer_config_items[i].type;
510 break;
511 }
512
513 if (!name)
514 return 0;
515
516 item = get_conf_item(name);
517 conf = &item->conf;
518 free(name);
519
520 switch (type) {
521 case TRAILER_KEY:
522 if (conf->key)
523 warning(_("more than one %s"), conf_key);
524 conf->key = xstrdup(value);
525 break;
526 case TRAILER_COMMAND:
527 if (conf->command)
528 warning(_("more than one %s"), conf_key);
529 conf->command = xstrdup(value);
530 break;
531 case TRAILER_WHERE:
532 if (set_where(conf, value))
533 warning(_("unknown value '%s' for key '%s'"), value, conf_key);
534 break;
535 case TRAILER_IF_EXISTS:
536 if (set_if_exists(conf, value))
537 warning(_("unknown value '%s' for key '%s'"), value, conf_key);
538 break;
539 case TRAILER_IF_MISSING:
540 if (set_if_missing(conf, value))
541 warning(_("unknown value '%s' for key '%s'"), value, conf_key);
542 break;
543 default:
ef1177d1 544 die("BUG: trailer.c: unhandled type %d", type);
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CC
545 }
546 return 0;
547}
f0a90b4e 548
cc71b0de 549static const char *token_from_item(struct arg_item *item, char *tok)
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CC
550{
551 if (item->conf.key)
552 return item->conf.key;
553 if (tok)
554 return tok;
555 return item->conf.name;
556}
557
cc71b0de 558static int token_matches_item(const char *tok, struct arg_item *item, int tok_len)
f0a90b4e
CC
559{
560 if (!strncasecmp(tok, item->conf.name, tok_len))
561 return 1;
562 return item->conf.key ? !strncasecmp(tok, item->conf.key, tok_len) : 0;
563}
564
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565/*
566 * Return the location of the first separator in line, or -1 if there is no
567 * separator.
568 */
569static int find_separator(const char *line, const char *separators)
f0a90b4e 570{
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571 int loc = strcspn(line, separators);
572 if (!line[loc])
573 return -1;
574 return loc;
575}
f0a90b4e 576
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577/*
578 * Obtain the token, value, and conf from the given trailer.
579 *
580 * separator_pos must not be 0, since the token cannot be an empty string.
581 *
582 * If separator_pos is -1, interpret the whole trailer as a token.
583 */
584static void parse_trailer(struct strbuf *tok, struct strbuf *val,
585 const struct conf_info **conf, const char *trailer,
586 int separator_pos)
f0a90b4e 587{
cc71b0de 588 struct arg_item *item;
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589 int tok_len;
590 struct list_head *pos;
f0a90b4e 591
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592 if (separator_pos != -1) {
593 strbuf_add(tok, trailer, separator_pos);
f0a90b4e 594 strbuf_trim(tok);
fdbf4510 595 strbuf_addstr(val, trailer + separator_pos + 1);
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CC
596 strbuf_trim(val);
597 } else {
598 strbuf_addstr(tok, trailer);
599 strbuf_trim(tok);
600 }
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CC
601
602 /* Lookup if the token matches something in the config */
63ab3f34 603 tok_len = token_len_without_separator(tok->buf, tok->len);
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JT
604 if (conf)
605 *conf = &default_conf_info;
8966a394 606 list_for_each(pos, &conf_head) {
cc71b0de 607 item = list_entry(pos, struct arg_item, list);
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608 if (token_matches_item(tok->buf, item, tok_len)) {
609 char *tok_buf = strbuf_detach(tok, NULL);
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610 if (conf)
611 *conf = &item->conf;
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612 strbuf_addstr(tok, token_from_item(item, tok_buf));
613 free(tok_buf);
614 break;
615 }
f0a90b4e 616 }
f0a90b4e 617}
f0a90b4e 618
60ef86a1
JT
619static struct trailer_item *add_trailer_item(struct list_head *head, char *tok,
620 char *val)
f0a90b4e 621{
63ab3f34
JT
622 struct trailer_item *new = xcalloc(sizeof(*new), 1);
623 new->token = tok;
624 new->value = val;
8966a394 625 list_add_tail(&new->list, head);
60ef86a1 626 return new;
f0a90b4e
CC
627}
628
cc71b0de
JT
629static void add_arg_item(struct list_head *arg_head, char *tok, char *val,
630 const struct conf_info *conf)
f0a90b4e 631{
cc71b0de
JT
632 struct arg_item *new = xcalloc(sizeof(*new), 1);
633 new->token = tok;
634 new->value = val;
635 duplicate_conf(&new->conf, conf);
636 list_add_tail(&new->list, arg_head);
f0a90b4e
CC
637}
638
8966a394
JT
639static void process_command_line_args(struct list_head *arg_head,
640 struct string_list *trailers)
f0a90b4e 641{
f0a90b4e 642 struct string_list_item *tr;
cc71b0de 643 struct arg_item *item;
63ab3f34
JT
644 struct strbuf tok = STRBUF_INIT;
645 struct strbuf val = STRBUF_INIT;
646 const struct conf_info *conf;
8966a394 647 struct list_head *pos;
85039fb6 648
fdbf4510
JT
649 /*
650 * In command-line arguments, '=' is accepted (in addition to the
651 * separators that are defined).
652 */
653 char *cl_separators = xstrfmt("=%s", separators);
654
cc71b0de 655 /* Add an arg item for each configured trailer with a command */
8966a394 656 list_for_each(pos, &conf_head) {
cc71b0de 657 item = list_entry(pos, struct arg_item, list);
63ab3f34 658 if (item->conf.command)
cc71b0de
JT
659 add_arg_item(arg_head,
660 xstrdup(token_from_item(item, NULL)),
661 xstrdup(""),
662 &item->conf);
85039fb6 663 }
f0a90b4e 664
cc71b0de 665 /* Add an arg item for each trailer on the command line */
f0a90b4e 666 for_each_string_list_item(tr, trailers) {
fdbf4510
JT
667 int separator_pos = find_separator(tr->string, cl_separators);
668 if (separator_pos == 0) {
669 struct strbuf sb = STRBUF_INIT;
670 strbuf_addstr(&sb, tr->string);
671 strbuf_trim(&sb);
672 error(_("empty trailer token in trailer '%.*s'"),
673 (int) sb.len, sb.buf);
674 strbuf_release(&sb);
675 } else {
676 parse_trailer(&tok, &val, &conf, tr->string,
677 separator_pos);
cc71b0de
JT
678 add_arg_item(arg_head,
679 strbuf_detach(&tok, NULL),
680 strbuf_detach(&val, NULL),
681 conf);
fdbf4510 682 }
f0a90b4e
CC
683 }
684
fdbf4510 685 free(cl_separators);
f0a90b4e 686}
2013d850
CC
687
688static struct strbuf **read_input_file(const char *file)
689{
690 struct strbuf **lines;
691 struct strbuf sb = STRBUF_INIT;
692
693 if (file) {
694 if (strbuf_read_file(&sb, file, 0) < 0)
695 die_errno(_("could not read input file '%s'"), file);
696 } else {
697 if (strbuf_read(&sb, fileno(stdin), 0) < 0)
698 die_errno(_("could not read from stdin"));
699 }
700
701 lines = strbuf_split(&sb, '\n');
702
703 strbuf_release(&sb);
704
705 return lines;
706}
707
708/*
709 * Return the (0 based) index of the start of the patch or the line
710 * count if there is no patch in the message.
711 */
712static int find_patch_start(struct strbuf **lines, int count)
713{
714 int i;
715
716 /* Get the start of the patch part if any */
717 for (i = 0; i < count; i++) {
718 if (starts_with(lines[i]->buf, "---"))
719 return i;
720 }
721
722 return count;
723}
724
725/*
726 * Return the (0 based) index of the first trailer line or count if
727 * there are no trailers. Trailers are searched only in the lines from
728 * index (count - 1) down to index 0.
729 */
730static int find_trailer_start(struct strbuf **lines, int count)
731{
5c99995d 732 int start, end_of_title, only_spaces = 1;
14624506 733 int recognized_prefix = 0, trailer_lines = 0, non_trailer_lines = 0;
60ef86a1
JT
734 /*
735 * Number of possible continuation lines encountered. This will be
736 * reset to 0 if we encounter a trailer (since those lines are to be
737 * considered continuations of that trailer), and added to
738 * non_trailer_lines if we encounter a non-trailer (since those lines
739 * are to be considered non-trailers).
740 */
741 int possible_continuation_lines = 0;
5c99995d
CC
742
743 /* The first paragraph is the title and cannot be trailers */
744 for (start = 0; start < count; start++) {
745 if (lines[start]->buf[0] == comment_line_char)
746 continue;
747 if (contains_only_spaces(lines[start]->buf))
748 break;
749 }
750 end_of_title = start;
2013d850
CC
751
752 /*
14624506
JT
753 * Get the start of the trailers by looking starting from the end for a
754 * blank line before a set of non-blank lines that (i) are all
755 * trailers, or (ii) contains at least one Git-generated trailer and
756 * consists of at least 25% trailers.
2013d850 757 */
5c99995d 758 for (start = count - 1; start >= end_of_title; start--) {
14624506
JT
759 const char **p;
760 int separator_pos;
761
60ef86a1
JT
762 if (lines[start]->buf[0] == comment_line_char) {
763 non_trailer_lines += possible_continuation_lines;
764 possible_continuation_lines = 0;
2013d850 765 continue;
60ef86a1 766 }
2013d850
CC
767 if (contains_only_spaces(lines[start]->buf)) {
768 if (only_spaces)
769 continue;
60ef86a1 770 non_trailer_lines += possible_continuation_lines;
14624506
JT
771 if (recognized_prefix &&
772 trailer_lines * 3 >= non_trailer_lines)
773 return start + 1;
774 if (trailer_lines && !non_trailer_lines)
775 return start + 1;
776 return count;
2013d850 777 }
14624506
JT
778 only_spaces = 0;
779
780 for (p = git_generated_prefixes; *p; p++) {
781 if (starts_with(lines[start]->buf, *p)) {
782 trailer_lines++;
60ef86a1 783 possible_continuation_lines = 0;
14624506
JT
784 recognized_prefix = 1;
785 goto continue_outer_loop;
786 }
2013d850 787 }
14624506 788
60ef86a1 789 separator_pos = find_separator(lines[start]->buf, separators);
c463a6b2 790 if (separator_pos >= 1 && !isspace(lines[start]->buf[0])) {
14624506
JT
791 struct list_head *pos;
792
793 trailer_lines++;
60ef86a1 794 possible_continuation_lines = 0;
14624506
JT
795 if (recognized_prefix)
796 continue;
797 list_for_each(pos, &conf_head) {
798 struct arg_item *item;
799 item = list_entry(pos, struct arg_item, list);
800 if (token_matches_item(lines[start]->buf, item,
801 separator_pos)) {
802 recognized_prefix = 1;
803 break;
804 }
805 }
60ef86a1
JT
806 } else if (isspace(lines[start]->buf[0]))
807 possible_continuation_lines++;
808 else {
14624506 809 non_trailer_lines++;
60ef86a1
JT
810 non_trailer_lines += possible_continuation_lines;
811 possible_continuation_lines = 0;
2013d850 812 }
14624506
JT
813continue_outer_loop:
814 ;
2013d850
CC
815 }
816
14624506 817 return count;
2013d850
CC
818}
819
61cfef4c
CC
820/* Get the index of the end of the trailers */
821static int find_trailer_end(struct strbuf **lines, int patch_start)
822{
823 struct strbuf sb = STRBUF_INIT;
824 int i, ignore_bytes;
825
826 for (i = 0; i < patch_start; i++)
827 strbuf_addbuf(&sb, lines[i]);
828 ignore_bytes = ignore_non_trailer(&sb);
829 strbuf_release(&sb);
830 for (i = patch_start - 1; i >= 0 && ignore_bytes > 0; i--)
831 ignore_bytes -= lines[i]->len;
832
833 return i + 1;
834}
835
2013d850
CC
836static int has_blank_line_before(struct strbuf **lines, int start)
837{
838 for (;start >= 0; start--) {
839 if (lines[start]->buf[0] == comment_line_char)
840 continue;
841 return contains_only_spaces(lines[start]->buf);
842 }
843 return 0;
844}
845
d0d2344a 846static void print_lines(FILE *outfile, struct strbuf **lines, int start, int end)
2013d850
CC
847{
848 int i;
849 for (i = start; lines[i] && i < end; i++)
d0d2344a 850 fprintf(outfile, "%s", lines[i]->buf);
2013d850
CC
851}
852
d0d2344a
TK
853static int process_input_file(FILE *outfile,
854 struct strbuf **lines,
8966a394 855 struct list_head *head)
2013d850
CC
856{
857 int count = 0;
61cfef4c 858 int patch_start, trailer_start, trailer_end, i;
63ab3f34
JT
859 struct strbuf tok = STRBUF_INIT;
860 struct strbuf val = STRBUF_INIT;
60ef86a1 861 struct trailer_item *last = NULL;
2013d850
CC
862
863 /* Get the line count */
864 while (lines[count])
865 count++;
866
867 patch_start = find_patch_start(lines, count);
61cfef4c
CC
868 trailer_end = find_trailer_end(lines, patch_start);
869 trailer_start = find_trailer_start(lines, trailer_end);
2013d850
CC
870
871 /* Print lines before the trailers as is */
d0d2344a 872 print_lines(outfile, lines, 0, trailer_start);
2013d850
CC
873
874 if (!has_blank_line_before(lines, trailer_start - 1))
d0d2344a 875 fprintf(outfile, "\n");
2013d850
CC
876
877 /* Parse trailer lines */
61cfef4c 878 for (i = trailer_start; i < trailer_end; i++) {
fdbf4510
JT
879 int separator_pos;
880 if (lines[i]->buf[0] == comment_line_char)
881 continue;
60ef86a1
JT
882 if (last && isspace(lines[i]->buf[0])) {
883 struct strbuf sb = STRBUF_INIT;
884 strbuf_addf(&sb, "%s\n%s", last->value, lines[i]->buf);
885 strbuf_strip_suffix(&sb, "\n");
886 free(last->value);
887 last->value = strbuf_detach(&sb, NULL);
888 continue;
889 }
fdbf4510
JT
890 separator_pos = find_separator(lines[i]->buf, separators);
891 if (separator_pos >= 1) {
892 parse_trailer(&tok, &val, NULL, lines[i]->buf,
893 separator_pos);
60ef86a1
JT
894 last = add_trailer_item(head,
895 strbuf_detach(&tok, NULL),
896 strbuf_detach(&val, NULL));
14624506
JT
897 } else {
898 strbuf_addbuf(&val, lines[i]);
899 strbuf_strip_suffix(&val, "\n");
900 add_trailer_item(head,
901 NULL,
902 strbuf_detach(&val, NULL));
60ef86a1 903 last = NULL;
2887103b 904 }
2013d850
CC
905 }
906
61cfef4c 907 return trailer_end;
2013d850 908}
b1d78d77 909
8966a394 910static void free_all(struct list_head *head)
b1d78d77 911{
8966a394
JT
912 struct list_head *pos, *p;
913 list_for_each_safe(pos, p, head) {
914 list_del(pos);
915 free_trailer_item(list_entry(pos, struct trailer_item, list));
b1d78d77
CC
916 }
917}
918
e1f89863
TK
919static struct tempfile trailers_tempfile;
920
921static FILE *create_in_place_tempfile(const char *file)
922{
923 struct stat st;
924 struct strbuf template = STRBUF_INIT;
925 const char *tail;
926 FILE *outfile;
927
928 if (stat(file, &st))
929 die_errno(_("could not stat %s"), file);
930 if (!S_ISREG(st.st_mode))
931 die(_("file %s is not a regular file"), file);
932 if (!(st.st_mode & S_IWUSR))
933 die(_("file %s is not writable by user"), file);
934
935 /* Create temporary file in the same directory as the original */
936 tail = strrchr(file, '/');
937 if (tail != NULL)
938 strbuf_add(&template, file, tail - file + 1);
939 strbuf_addstr(&template, "git-interpret-trailers-XXXXXX");
940
941 xmks_tempfile_m(&trailers_tempfile, template.buf, st.st_mode);
942 strbuf_release(&template);
943 outfile = fdopen_tempfile(&trailers_tempfile, "w");
944 if (!outfile)
945 die_errno(_("could not open temporary file"));
946
947 return outfile;
948}
949
950void process_trailers(const char *file, int in_place, int trim_empty, struct string_list *trailers)
b1d78d77 951{
8966a394
JT
952 LIST_HEAD(head);
953 LIST_HEAD(arg_head);
b1d78d77 954 struct strbuf **lines;
61cfef4c 955 int trailer_end;
d0d2344a 956 FILE *outfile = stdout;
b1d78d77
CC
957
958 /* Default config must be setup first */
959 git_config(git_trailer_default_config, NULL);
960 git_config(git_trailer_config, NULL);
961
962 lines = read_input_file(file);
963
e1f89863
TK
964 if (in_place)
965 outfile = create_in_place_tempfile(file);
966
b1d78d77 967 /* Print the lines before the trailers */
8966a394 968 trailer_end = process_input_file(outfile, lines, &head);
b1d78d77 969
8966a394 970 process_command_line_args(&arg_head, trailers);
b1d78d77 971
8966a394 972 process_trailers_lists(&head, &arg_head);
b1d78d77 973
8966a394 974 print_all(outfile, &head, trim_empty);
b1d78d77 975
8966a394 976 free_all(&head);
b1d78d77
CC
977
978 /* Print the lines after the trailers as is */
d0d2344a 979 print_lines(outfile, lines, trailer_end, INT_MAX);
b1d78d77 980
e1f89863
TK
981 if (in_place)
982 if (rename_tempfile(&trailers_tempfile, file))
983 die_errno(_("could not rename temporary file to %s"), file);
984
b1d78d77
CC
985 strbuf_list_free(lines);
986}