cherry-pick/revert: transparently refresh index
[git] / log-tree.c
1 #include "cache.h"
2 #include "diff.h"
3 #include "commit.h"
4 #include "tag.h"
5 #include "graph.h"
6 #include "log-tree.h"
7 #include "reflog-walk.h"
8 #include "refs.h"
9 #include "string-list.h"
10 #include "color.h"
11
12 struct decoration name_decoration = { "object names" };
13
14 enum decoration_type {
15         DECORATION_NONE = 0,
16         DECORATION_REF_LOCAL,
17         DECORATION_REF_REMOTE,
18         DECORATION_REF_TAG,
19         DECORATION_REF_STASH,
20         DECORATION_REF_HEAD,
21 };
22
23 static char decoration_colors[][COLOR_MAXLEN] = {
24         GIT_COLOR_RESET,
25         GIT_COLOR_BOLD_GREEN,   /* REF_LOCAL */
26         GIT_COLOR_BOLD_RED,     /* REF_REMOTE */
27         GIT_COLOR_BOLD_YELLOW,  /* REF_TAG */
28         GIT_COLOR_BOLD_MAGENTA, /* REF_STASH */
29         GIT_COLOR_BOLD_CYAN,    /* REF_HEAD */
30 };
31
32 static const char *decorate_get_color(int decorate_use_color, enum decoration_type ix)
33 {
34         if (decorate_use_color)
35                 return decoration_colors[ix];
36         return "";
37 }
38
39 static int parse_decorate_color_slot(const char *slot)
40 {
41         /*
42          * We're comparing with 'ignore-case' on
43          * (because config.c sets them all tolower),
44          * but let's match the letters in the literal
45          * string values here with how they are
46          * documented in Documentation/config.txt, for
47          * consistency.
48          *
49          * We love being consistent, don't we?
50          */
51         if (!strcasecmp(slot, "branch"))
52                 return DECORATION_REF_LOCAL;
53         if (!strcasecmp(slot, "remoteBranch"))
54                 return DECORATION_REF_REMOTE;
55         if (!strcasecmp(slot, "tag"))
56                 return DECORATION_REF_TAG;
57         if (!strcasecmp(slot, "stash"))
58                 return DECORATION_REF_STASH;
59         if (!strcasecmp(slot, "HEAD"))
60                 return DECORATION_REF_HEAD;
61         return -1;
62 }
63
64 int parse_decorate_color_config(const char *var, const int ofs, const char *value)
65 {
66         int slot = parse_decorate_color_slot(var + ofs);
67         if (slot < 0)
68                 return 0;
69         if (!value)
70                 return config_error_nonbool(var);
71         color_parse(value, var, decoration_colors[slot]);
72         return 0;
73 }
74
75 /*
76  * log-tree.c uses DIFF_OPT_TST for determining whether to use color
77  * for showing the commit sha1, use the same check for --decorate
78  */
79 #define decorate_get_color_opt(o, ix) \
80         decorate_get_color(DIFF_OPT_TST((o), COLOR_DIFF), ix)
81
82 static void add_name_decoration(enum decoration_type type, const char *name, struct object *obj)
83 {
84         int nlen = strlen(name);
85         struct name_decoration *res = xmalloc(sizeof(struct name_decoration) + nlen);
86         memcpy(res->name, name, nlen + 1);
87         res->type = type;
88         res->next = add_decoration(&name_decoration, obj, res);
89 }
90
91 static int add_ref_decoration(const char *refname, const unsigned char *sha1, int flags, void *cb_data)
92 {
93         struct object *obj = parse_object(sha1);
94         enum decoration_type type = DECORATION_NONE;
95         if (!obj)
96                 return 0;
97
98         if (!prefixcmp(refname, "refs/heads"))
99                 type = DECORATION_REF_LOCAL;
100         else if (!prefixcmp(refname, "refs/remotes"))
101                 type = DECORATION_REF_REMOTE;
102         else if (!prefixcmp(refname, "refs/tags"))
103                 type = DECORATION_REF_TAG;
104         else if (!prefixcmp(refname, "refs/stash"))
105                 type = DECORATION_REF_STASH;
106         else if (!prefixcmp(refname, "HEAD"))
107                 type = DECORATION_REF_HEAD;
108
109         if (!cb_data || *(int *)cb_data == DECORATE_SHORT_REFS)
110                 refname = prettify_refname(refname);
111         add_name_decoration(type, refname, obj);
112         while (obj->type == OBJ_TAG) {
113                 obj = ((struct tag *)obj)->tagged;
114                 if (!obj)
115                         break;
116                 add_name_decoration(DECORATION_REF_TAG, refname, obj);
117         }
118         return 0;
119 }
120
121 void load_ref_decorations(int flags)
122 {
123         static int loaded;
124         if (!loaded) {
125                 loaded = 1;
126                 for_each_ref(add_ref_decoration, &flags);
127                 head_ref(add_ref_decoration, &flags);
128         }
129 }
130
131 static void show_parents(struct commit *commit, int abbrev)
132 {
133         struct commit_list *p;
134         for (p = commit->parents; p ; p = p->next) {
135                 struct commit *parent = p->item;
136                 printf(" %s", find_unique_abbrev(parent->object.sha1, abbrev));
137         }
138 }
139
140 void show_decorations(struct rev_info *opt, struct commit *commit)
141 {
142         const char *prefix;
143         struct name_decoration *decoration;
144         const char *color_commit =
145                 diff_get_color_opt(&opt->diffopt, DIFF_COMMIT);
146         const char *color_reset =
147                 decorate_get_color_opt(&opt->diffopt, DECORATION_NONE);
148
149         if (opt->show_source && commit->util)
150                 printf("\t%s", (char *) commit->util);
151         if (!opt->show_decorations)
152                 return;
153         decoration = lookup_decoration(&name_decoration, &commit->object);
154         if (!decoration)
155                 return;
156         prefix = " (";
157         while (decoration) {
158                 printf("%s", prefix);
159                 fputs(decorate_get_color_opt(&opt->diffopt, decoration->type),
160                       stdout);
161                 if (decoration->type == DECORATION_REF_TAG)
162                         fputs("tag: ", stdout);
163                 printf("%s", decoration->name);
164                 fputs(color_reset, stdout);
165                 fputs(color_commit, stdout);
166                 prefix = ", ";
167                 decoration = decoration->next;
168         }
169         putchar(')');
170 }
171
172 /*
173  * Search for "^[-A-Za-z]+: [^@]+@" pattern. It usually matches
174  * Signed-off-by: and Acked-by: lines.
175  */
176 static int detect_any_signoff(char *letter, int size)
177 {
178         char *cp;
179         int seen_colon = 0;
180         int seen_at = 0;
181         int seen_name = 0;
182         int seen_head = 0;
183
184         cp = letter + size;
185         while (letter <= --cp && *cp == '\n')
186                 continue;
187
188         while (letter <= cp) {
189                 char ch = *cp--;
190                 if (ch == '\n')
191                         break;
192
193                 if (!seen_at) {
194                         if (ch == '@')
195                                 seen_at = 1;
196                         continue;
197                 }
198                 if (!seen_colon) {
199                         if (ch == '@')
200                                 return 0;
201                         else if (ch == ':')
202                                 seen_colon = 1;
203                         else
204                                 seen_name = 1;
205                         continue;
206                 }
207                 if (('A' <= ch && ch <= 'Z') ||
208                     ('a' <= ch && ch <= 'z') ||
209                     ch == '-') {
210                         seen_head = 1;
211                         continue;
212                 }
213                 /* no empty last line doesn't match */
214                 return 0;
215         }
216         return seen_head && seen_name;
217 }
218
219 static void append_signoff(struct strbuf *sb, const char *signoff)
220 {
221         static const char signed_off_by[] = "Signed-off-by: ";
222         size_t signoff_len = strlen(signoff);
223         int has_signoff = 0;
224         char *cp;
225
226         cp = sb->buf;
227
228         /* First see if we already have the sign-off by the signer */
229         while ((cp = strstr(cp, signed_off_by))) {
230
231                 has_signoff = 1;
232
233                 cp += strlen(signed_off_by);
234                 if (cp + signoff_len >= sb->buf + sb->len)
235                         break;
236                 if (strncmp(cp, signoff, signoff_len))
237                         continue;
238                 if (!isspace(cp[signoff_len]))
239                         continue;
240                 /* we already have him */
241                 return;
242         }
243
244         if (!has_signoff)
245                 has_signoff = detect_any_signoff(sb->buf, sb->len);
246
247         if (!has_signoff)
248                 strbuf_addch(sb, '\n');
249
250         strbuf_addstr(sb, signed_off_by);
251         strbuf_add(sb, signoff, signoff_len);
252         strbuf_addch(sb, '\n');
253 }
254
255 static unsigned int digits_in_number(unsigned int number)
256 {
257         unsigned int i = 10, result = 1;
258         while (i <= number) {
259                 i *= 10;
260                 result++;
261         }
262         return result;
263 }
264
265 void get_patch_filename(struct commit *commit, int nr, const char *suffix,
266                         struct strbuf *buf)
267 {
268         int suffix_len = strlen(suffix) + 1;
269         int start_len = buf->len;
270
271         strbuf_addf(buf, commit ? "%04d-" : "%d", nr);
272         if (commit) {
273                 int max_len = start_len + FORMAT_PATCH_NAME_MAX - suffix_len;
274                 struct pretty_print_context ctx = {0};
275                 ctx.date_mode = DATE_NORMAL;
276
277                 format_commit_message(commit, "%f", buf, &ctx);
278                 if (max_len < buf->len)
279                         strbuf_setlen(buf, max_len);
280                 strbuf_addstr(buf, suffix);
281         }
282 }
283
284 void log_write_email_headers(struct rev_info *opt, struct commit *commit,
285                              const char **subject_p,
286                              const char **extra_headers_p,
287                              int *need_8bit_cte_p)
288 {
289         const char *subject = NULL;
290         const char *extra_headers = opt->extra_headers;
291         const char *name = sha1_to_hex(commit->object.sha1);
292
293         *need_8bit_cte_p = 0; /* unknown */
294         if (opt->total > 0) {
295                 static char buffer[64];
296                 snprintf(buffer, sizeof(buffer),
297                          "Subject: [%s %0*d/%d] ",
298                          opt->subject_prefix,
299                          digits_in_number(opt->total),
300                          opt->nr, opt->total);
301                 subject = buffer;
302         } else if (opt->total == 0 && opt->subject_prefix && *opt->subject_prefix) {
303                 static char buffer[256];
304                 snprintf(buffer, sizeof(buffer),
305                          "Subject: [%s] ",
306                          opt->subject_prefix);
307                 subject = buffer;
308         } else {
309                 subject = "Subject: ";
310         }
311
312         printf("From %s Mon Sep 17 00:00:00 2001\n", name);
313         graph_show_oneline(opt->graph);
314         if (opt->message_id) {
315                 printf("Message-Id: <%s>\n", opt->message_id);
316                 graph_show_oneline(opt->graph);
317         }
318         if (opt->ref_message_ids && opt->ref_message_ids->nr > 0) {
319                 int i, n;
320                 n = opt->ref_message_ids->nr;
321                 printf("In-Reply-To: <%s>\n", opt->ref_message_ids->items[n-1].string);
322                 for (i = 0; i < n; i++)
323                         printf("%s<%s>\n", (i > 0 ? "\t" : "References: "),
324                                opt->ref_message_ids->items[i].string);
325                 graph_show_oneline(opt->graph);
326         }
327         if (opt->mime_boundary) {
328                 static char subject_buffer[1024];
329                 static char buffer[1024];
330                 struct strbuf filename =  STRBUF_INIT;
331                 *need_8bit_cte_p = -1; /* NEVER */
332                 snprintf(subject_buffer, sizeof(subject_buffer) - 1,
333                          "%s"
334                          "MIME-Version: 1.0\n"
335                          "Content-Type: multipart/mixed;"
336                          " boundary=\"%s%s\"\n"
337                          "\n"
338                          "This is a multi-part message in MIME "
339                          "format.\n"
340                          "--%s%s\n"
341                          "Content-Type: text/plain; "
342                          "charset=UTF-8; format=fixed\n"
343                          "Content-Transfer-Encoding: 8bit\n\n",
344                          extra_headers ? extra_headers : "",
345                          mime_boundary_leader, opt->mime_boundary,
346                          mime_boundary_leader, opt->mime_boundary);
347                 extra_headers = subject_buffer;
348
349                 get_patch_filename(opt->numbered_files ? NULL : commit, opt->nr,
350                                     opt->patch_suffix, &filename);
351                 snprintf(buffer, sizeof(buffer) - 1,
352                          "\n--%s%s\n"
353                          "Content-Type: text/x-patch;"
354                          " name=\"%s\"\n"
355                          "Content-Transfer-Encoding: 8bit\n"
356                          "Content-Disposition: %s;"
357                          " filename=\"%s\"\n\n",
358                          mime_boundary_leader, opt->mime_boundary,
359                          filename.buf,
360                          opt->no_inline ? "attachment" : "inline",
361                          filename.buf);
362                 opt->diffopt.stat_sep = buffer;
363                 strbuf_release(&filename);
364         }
365         *subject_p = subject;
366         *extra_headers_p = extra_headers;
367 }
368
369 void show_log(struct rev_info *opt)
370 {
371         struct strbuf msgbuf = STRBUF_INIT;
372         struct log_info *log = opt->loginfo;
373         struct commit *commit = log->commit, *parent = log->parent;
374         int abbrev_commit = opt->abbrev_commit ? opt->abbrev : 40;
375         const char *extra_headers = opt->extra_headers;
376         struct pretty_print_context ctx = {0};
377
378         opt->loginfo = NULL;
379         ctx.show_notes = opt->show_notes;
380         if (!opt->verbose_header) {
381                 graph_show_commit(opt->graph);
382
383                 if (!opt->graph) {
384                         if (commit->object.flags & BOUNDARY)
385                                 putchar('-');
386                         else if (commit->object.flags & UNINTERESTING)
387                                 putchar('^');
388                         else if (opt->left_right) {
389                                 if (commit->object.flags & SYMMETRIC_LEFT)
390                                         putchar('<');
391                                 else
392                                         putchar('>');
393                         }
394                 }
395                 fputs(find_unique_abbrev(commit->object.sha1, abbrev_commit), stdout);
396                 if (opt->print_parents)
397                         show_parents(commit, abbrev_commit);
398                 show_decorations(opt, commit);
399                 if (opt->graph && !graph_is_commit_finished(opt->graph)) {
400                         putchar('\n');
401                         graph_show_remainder(opt->graph);
402                 }
403                 putchar(opt->diffopt.line_termination);
404                 return;
405         }
406
407         /*
408          * If use_terminator is set, we already handled any record termination
409          * at the end of the last record.
410          * Otherwise, add a diffopt.line_termination character before all
411          * entries but the first.  (IOW, as a separator between entries)
412          */
413         if (opt->shown_one && !opt->use_terminator) {
414                 /*
415                  * If entries are separated by a newline, the output
416                  * should look human-readable.  If the last entry ended
417                  * with a newline, print the graph output before this
418                  * newline.  Otherwise it will end up as a completely blank
419                  * line and will look like a gap in the graph.
420                  *
421                  * If the entry separator is not a newline, the output is
422                  * primarily intended for programmatic consumption, and we
423                  * never want the extra graph output before the entry
424                  * separator.
425                  */
426                 if (opt->diffopt.line_termination == '\n' &&
427                     !opt->missing_newline)
428                         graph_show_padding(opt->graph);
429                 putchar(opt->diffopt.line_termination);
430         }
431         opt->shown_one = 1;
432
433         /*
434          * If the history graph was requested,
435          * print the graph, up to this commit's line
436          */
437         graph_show_commit(opt->graph);
438
439         /*
440          * Print header line of header..
441          */
442
443         if (opt->commit_format == CMIT_FMT_EMAIL) {
444                 log_write_email_headers(opt, commit, &ctx.subject, &extra_headers,
445                                         &ctx.need_8bit_cte);
446         } else if (opt->commit_format != CMIT_FMT_USERFORMAT) {
447                 fputs(diff_get_color_opt(&opt->diffopt, DIFF_COMMIT), stdout);
448                 if (opt->commit_format != CMIT_FMT_ONELINE)
449                         fputs("commit ", stdout);
450
451                 if (!opt->graph) {
452                         if (commit->object.flags & BOUNDARY)
453                                 putchar('-');
454                         else if (commit->object.flags & UNINTERESTING)
455                                 putchar('^');
456                         else if (opt->left_right) {
457                                 if (commit->object.flags & SYMMETRIC_LEFT)
458                                         putchar('<');
459                                 else
460                                         putchar('>');
461                         }
462                 }
463                 fputs(find_unique_abbrev(commit->object.sha1, abbrev_commit),
464                       stdout);
465                 if (opt->print_parents)
466                         show_parents(commit, abbrev_commit);
467                 if (parent)
468                         printf(" (from %s)",
469                                find_unique_abbrev(parent->object.sha1,
470                                                   abbrev_commit));
471                 show_decorations(opt, commit);
472                 printf("%s", diff_get_color_opt(&opt->diffopt, DIFF_RESET));
473                 if (opt->commit_format == CMIT_FMT_ONELINE) {
474                         putchar(' ');
475                 } else {
476                         putchar('\n');
477                         graph_show_oneline(opt->graph);
478                 }
479                 if (opt->reflog_info) {
480                         /*
481                          * setup_revisions() ensures that opt->reflog_info
482                          * and opt->graph cannot both be set,
483                          * so we don't need to worry about printing the
484                          * graph info here.
485                          */
486                         show_reflog_message(opt->reflog_info,
487                                     opt->commit_format == CMIT_FMT_ONELINE,
488                                     opt->date_mode_explicit ?
489                                         opt->date_mode :
490                                         DATE_NORMAL);
491                         if (opt->commit_format == CMIT_FMT_ONELINE)
492                                 return;
493                 }
494         }
495
496         if (!commit->buffer)
497                 return;
498
499         /*
500          * And then the pretty-printed message itself
501          */
502         if (ctx.need_8bit_cte >= 0)
503                 ctx.need_8bit_cte = has_non_ascii(opt->add_signoff);
504         ctx.date_mode = opt->date_mode;
505         ctx.abbrev = opt->diffopt.abbrev;
506         ctx.after_subject = extra_headers;
507         ctx.reflog_info = opt->reflog_info;
508         pretty_print_commit(opt->commit_format, commit, &msgbuf, &ctx);
509
510         if (opt->add_signoff)
511                 append_signoff(&msgbuf, opt->add_signoff);
512         if (opt->show_log_size) {
513                 printf("log size %i\n", (int)msgbuf.len);
514                 graph_show_oneline(opt->graph);
515         }
516
517         /*
518          * Set opt->missing_newline if msgbuf doesn't
519          * end in a newline (including if it is empty)
520          */
521         if (!msgbuf.len || msgbuf.buf[msgbuf.len - 1] != '\n')
522                 opt->missing_newline = 1;
523         else
524                 opt->missing_newline = 0;
525
526         if (opt->graph)
527                 graph_show_commit_msg(opt->graph, &msgbuf);
528         else
529                 fwrite(msgbuf.buf, sizeof(char), msgbuf.len, stdout);
530         if (opt->use_terminator) {
531                 if (!opt->missing_newline)
532                         graph_show_padding(opt->graph);
533                 putchar('\n');
534         }
535
536         strbuf_release(&msgbuf);
537 }
538
539 int log_tree_diff_flush(struct rev_info *opt)
540 {
541         diffcore_std(&opt->diffopt);
542
543         if (diff_queue_is_empty()) {
544                 int saved_fmt = opt->diffopt.output_format;
545                 opt->diffopt.output_format = DIFF_FORMAT_NO_OUTPUT;
546                 diff_flush(&opt->diffopt);
547                 opt->diffopt.output_format = saved_fmt;
548                 return 0;
549         }
550
551         if (opt->loginfo && !opt->no_commit_id) {
552                 /* When showing a verbose header (i.e. log message),
553                  * and not in --pretty=oneline format, we would want
554                  * an extra newline between the end of log and the
555                  * output for readability.
556                  */
557                 show_log(opt);
558                 if ((opt->diffopt.output_format & ~DIFF_FORMAT_NO_OUTPUT) &&
559                     opt->verbose_header &&
560                     opt->commit_format != CMIT_FMT_ONELINE) {
561                         int pch = DIFF_FORMAT_DIFFSTAT | DIFF_FORMAT_PATCH;
562                         if ((pch & opt->diffopt.output_format) == pch)
563                                 printf("---");
564                         if (opt->diffopt.output_prefix) {
565                                 struct strbuf *msg = NULL;
566                                 msg = opt->diffopt.output_prefix(&opt->diffopt,
567                                         opt->diffopt.output_prefix_data);
568                                 fwrite(msg->buf, msg->len, 1, stdout);
569                         }
570                         putchar('\n');
571                 }
572         }
573         diff_flush(&opt->diffopt);
574         return 1;
575 }
576
577 static int do_diff_combined(struct rev_info *opt, struct commit *commit)
578 {
579         unsigned const char *sha1 = commit->object.sha1;
580
581         diff_tree_combined_merge(sha1, opt->dense_combined_merges, opt);
582         return !opt->loginfo;
583 }
584
585 /*
586  * Show the diff of a commit.
587  *
588  * Return true if we printed any log info messages
589  */
590 static int log_tree_diff(struct rev_info *opt, struct commit *commit, struct log_info *log)
591 {
592         int showed_log;
593         struct commit_list *parents;
594         unsigned const char *sha1 = commit->object.sha1;
595
596         if (!opt->diff && !DIFF_OPT_TST(&opt->diffopt, EXIT_WITH_STATUS))
597                 return 0;
598
599         /* Root commit? */
600         parents = commit->parents;
601         if (!parents) {
602                 if (opt->show_root_diff) {
603                         diff_root_tree_sha1(sha1, "", &opt->diffopt);
604                         log_tree_diff_flush(opt);
605                 }
606                 return !opt->loginfo;
607         }
608
609         /* More than one parent? */
610         if (parents && parents->next) {
611                 if (opt->ignore_merges)
612                         return 0;
613                 else if (opt->combine_merges)
614                         return do_diff_combined(opt, commit);
615                 else if (opt->first_parent_only) {
616                         /*
617                          * Generate merge log entry only for the first
618                          * parent, showing summary diff of the others
619                          * we merged _in_.
620                          */
621                         diff_tree_sha1(parents->item->object.sha1, sha1, "", &opt->diffopt);
622                         log_tree_diff_flush(opt);
623                         return !opt->loginfo;
624                 }
625
626                 /* If we show individual diffs, show the parent info */
627                 log->parent = parents->item;
628         }
629
630         showed_log = 0;
631         for (;;) {
632                 struct commit *parent = parents->item;
633
634                 diff_tree_sha1(parent->object.sha1, sha1, "", &opt->diffopt);
635                 log_tree_diff_flush(opt);
636
637                 showed_log |= !opt->loginfo;
638
639                 /* Set up the log info for the next parent, if any.. */
640                 parents = parents->next;
641                 if (!parents)
642                         break;
643                 log->parent = parents->item;
644                 opt->loginfo = log;
645         }
646         return showed_log;
647 }
648
649 int log_tree_commit(struct rev_info *opt, struct commit *commit)
650 {
651         struct log_info log;
652         int shown;
653
654         log.commit = commit;
655         log.parent = NULL;
656         opt->loginfo = &log;
657
658         shown = log_tree_diff(opt, commit, &log);
659         if (!shown && opt->loginfo && opt->always_show_header) {
660                 log.parent = NULL;
661                 show_log(opt);
662                 shown = 1;
663         }
664         opt->loginfo = NULL;
665         maybe_flush_or_die(stdout, "stdout");
666         return shown;
667 }