Merge branch 'js/misc-fixes' into maint
[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 #include "gpg-interface.h"
12 #include "sequencer.h"
13 #include "line-log.h"
14
15 static struct decoration name_decoration = { "object names" };
16 static int decoration_loaded;
17 static int decoration_flags;
18
19 static char decoration_colors[][COLOR_MAXLEN] = {
20         GIT_COLOR_RESET,
21         GIT_COLOR_BOLD_GREEN,   /* REF_LOCAL */
22         GIT_COLOR_BOLD_RED,     /* REF_REMOTE */
23         GIT_COLOR_BOLD_YELLOW,  /* REF_TAG */
24         GIT_COLOR_BOLD_MAGENTA, /* REF_STASH */
25         GIT_COLOR_BOLD_CYAN,    /* REF_HEAD */
26         GIT_COLOR_BOLD_BLUE,    /* GRAFTED */
27 };
28
29 static const char *decorate_get_color(int decorate_use_color, enum decoration_type ix)
30 {
31         if (want_color(decorate_use_color))
32                 return decoration_colors[ix];
33         return "";
34 }
35
36 static int parse_decorate_color_slot(const char *slot)
37 {
38         /*
39          * We're comparing with 'ignore-case' on
40          * (because config.c sets them all tolower),
41          * but let's match the letters in the literal
42          * string values here with how they are
43          * documented in Documentation/config.txt, for
44          * consistency.
45          *
46          * We love being consistent, don't we?
47          */
48         if (!strcasecmp(slot, "branch"))
49                 return DECORATION_REF_LOCAL;
50         if (!strcasecmp(slot, "remoteBranch"))
51                 return DECORATION_REF_REMOTE;
52         if (!strcasecmp(slot, "tag"))
53                 return DECORATION_REF_TAG;
54         if (!strcasecmp(slot, "stash"))
55                 return DECORATION_REF_STASH;
56         if (!strcasecmp(slot, "HEAD"))
57                 return DECORATION_REF_HEAD;
58         return -1;
59 }
60
61 int parse_decorate_color_config(const char *var, const char *slot_name, const char *value)
62 {
63         int slot = parse_decorate_color_slot(slot_name);
64         if (slot < 0)
65                 return 0;
66         if (!value)
67                 return config_error_nonbool(var);
68         return color_parse(value, decoration_colors[slot]);
69 }
70
71 /*
72  * log-tree.c uses DIFF_OPT_TST for determining whether to use color
73  * for showing the commit sha1, use the same check for --decorate
74  */
75 #define decorate_get_color_opt(o, ix) \
76         decorate_get_color((o)->use_color, ix)
77
78 void add_name_decoration(enum decoration_type type, const char *name, struct object *obj)
79 {
80         int nlen = strlen(name);
81         struct name_decoration *res = xmalloc(sizeof(*res) + nlen + 1);
82         memcpy(res->name, name, nlen + 1);
83         res->type = type;
84         res->next = add_decoration(&name_decoration, obj, res);
85 }
86
87 const struct name_decoration *get_name_decoration(const struct object *obj)
88 {
89         return lookup_decoration(&name_decoration, obj);
90 }
91
92 static int add_ref_decoration(const char *refname, const struct object_id *oid,
93                               int flags, void *cb_data)
94 {
95         struct object *obj;
96         enum decoration_type type = DECORATION_NONE;
97
98         assert(cb_data == NULL);
99
100         if (starts_with(refname, git_replace_ref_base)) {
101                 struct object_id original_oid;
102                 if (!check_replace_refs)
103                         return 0;
104                 if (get_oid_hex(refname + strlen(git_replace_ref_base),
105                                 &original_oid)) {
106                         warning("invalid replace ref %s", refname);
107                         return 0;
108                 }
109                 obj = parse_object(original_oid.hash);
110                 if (obj)
111                         add_name_decoration(DECORATION_GRAFTED, "replaced", obj);
112                 return 0;
113         }
114
115         obj = parse_object(oid->hash);
116         if (!obj)
117                 return 0;
118
119         if (starts_with(refname, "refs/heads/"))
120                 type = DECORATION_REF_LOCAL;
121         else if (starts_with(refname, "refs/remotes/"))
122                 type = DECORATION_REF_REMOTE;
123         else if (starts_with(refname, "refs/tags/"))
124                 type = DECORATION_REF_TAG;
125         else if (!strcmp(refname, "refs/stash"))
126                 type = DECORATION_REF_STASH;
127         else if (!strcmp(refname, "HEAD"))
128                 type = DECORATION_REF_HEAD;
129
130         add_name_decoration(type, refname, obj);
131         while (obj->type == OBJ_TAG) {
132                 obj = ((struct tag *)obj)->tagged;
133                 if (!obj)
134                         break;
135                 if (!obj->parsed)
136                         parse_object(obj->sha1);
137                 add_name_decoration(DECORATION_REF_TAG, refname, obj);
138         }
139         return 0;
140 }
141
142 static int add_graft_decoration(const struct commit_graft *graft, void *cb_data)
143 {
144         struct commit *commit = lookup_commit(graft->oid.hash);
145         if (!commit)
146                 return 0;
147         add_name_decoration(DECORATION_GRAFTED, "grafted", &commit->object);
148         return 0;
149 }
150
151 void load_ref_decorations(int flags)
152 {
153         if (!decoration_loaded) {
154
155                 decoration_loaded = 1;
156                 decoration_flags = flags;
157                 for_each_ref(add_ref_decoration, NULL);
158                 head_ref(add_ref_decoration, NULL);
159                 for_each_commit_graft(add_graft_decoration, NULL);
160         }
161 }
162
163 static void show_parents(struct commit *commit, int abbrev)
164 {
165         struct commit_list *p;
166         for (p = commit->parents; p ; p = p->next) {
167                 struct commit *parent = p->item;
168                 printf(" %s", find_unique_abbrev(parent->object.sha1, abbrev));
169         }
170 }
171
172 static void show_children(struct rev_info *opt, struct commit *commit, int abbrev)
173 {
174         struct commit_list *p = lookup_decoration(&opt->children, &commit->object);
175         for ( ; p; p = p->next) {
176                 printf(" %s", find_unique_abbrev(p->item->object.sha1, abbrev));
177         }
178 }
179
180 /*
181  * Do we have HEAD in the output, and also the branch it points at?
182  * If so, find that decoration entry for that current branch.
183  */
184 static const struct name_decoration *current_pointed_by_HEAD(const struct name_decoration *decoration)
185 {
186         const struct name_decoration *list, *head = NULL;
187         const char *branch_name = NULL;
188         unsigned char unused[20];
189         int rru_flags;
190
191         /* First find HEAD */
192         for (list = decoration; list; list = list->next)
193                 if (list->type == DECORATION_REF_HEAD) {
194                         head = list;
195                         break;
196                 }
197         if (!head)
198                 return NULL;
199
200         /* Now resolve and find the matching current branch */
201         branch_name = resolve_ref_unsafe("HEAD", 0, unused, &rru_flags);
202         if (!(rru_flags & REF_ISSYMREF))
203                 return NULL;
204
205         if (!starts_with(branch_name, "refs/"))
206                 return NULL;
207
208         /* OK, do we have that ref in the list? */
209         for (list = decoration; list; list = list->next)
210                 if ((list->type == DECORATION_REF_LOCAL) &&
211                     !strcmp(branch_name, list->name)) {
212                         return list;
213                 }
214
215         return NULL;
216 }
217
218 static void show_name(struct strbuf *sb, const struct name_decoration *decoration)
219 {
220         if (decoration_flags == DECORATE_SHORT_REFS)
221                 strbuf_addstr(sb, prettify_refname(decoration->name));
222         else
223                 strbuf_addstr(sb, decoration->name);
224 }
225
226 /*
227  * The caller makes sure there is no funny color before calling.
228  * format_decorations_extended makes sure the same after return.
229  */
230 void format_decorations_extended(struct strbuf *sb,
231                         const struct commit *commit,
232                         int use_color,
233                         const char *prefix,
234                         const char *separator,
235                         const char *suffix)
236 {
237         const struct name_decoration *decoration;
238         const struct name_decoration *current_and_HEAD;
239         const char *color_commit =
240                 diff_get_color(use_color, DIFF_COMMIT);
241         const char *color_reset =
242                 decorate_get_color(use_color, DECORATION_NONE);
243
244         decoration = get_name_decoration(&commit->object);
245         if (!decoration)
246                 return;
247
248         current_and_HEAD = current_pointed_by_HEAD(decoration);
249         while (decoration) {
250                 /*
251                  * When both current and HEAD are there, only
252                  * show HEAD->current where HEAD would have
253                  * appeared, skipping the entry for current.
254                  */
255                 if (decoration != current_and_HEAD) {
256                         strbuf_addstr(sb, color_commit);
257                         strbuf_addstr(sb, prefix);
258                         strbuf_addstr(sb, color_reset);
259                         strbuf_addstr(sb, decorate_get_color(use_color, decoration->type));
260                         if (decoration->type == DECORATION_REF_TAG)
261                                 strbuf_addstr(sb, "tag: ");
262
263                         show_name(sb, decoration);
264
265                         if (current_and_HEAD &&
266                             decoration->type == DECORATION_REF_HEAD) {
267                                 strbuf_addstr(sb, color_reset);
268                                 strbuf_addstr(sb, color_commit);
269                                 strbuf_addstr(sb, " -> ");
270                                 strbuf_addstr(sb, color_reset);
271                                 strbuf_addstr(sb, decorate_get_color(use_color, current_and_HEAD->type));
272                                 show_name(sb, current_and_HEAD);
273                         }
274                         strbuf_addstr(sb, color_reset);
275
276                         prefix = separator;
277                 }
278                 decoration = decoration->next;
279         }
280         strbuf_addstr(sb, color_commit);
281         strbuf_addstr(sb, suffix);
282         strbuf_addstr(sb, color_reset);
283 }
284
285 void show_decorations(struct rev_info *opt, struct commit *commit)
286 {
287         struct strbuf sb = STRBUF_INIT;
288
289         if (opt->show_source && commit->util)
290                 printf("\t%s", (char *) commit->util);
291         if (!opt->show_decorations)
292                 return;
293         format_decorations(&sb, commit, opt->diffopt.use_color);
294         fputs(sb.buf, stdout);
295         strbuf_release(&sb);
296 }
297
298 static unsigned int digits_in_number(unsigned int number)
299 {
300         unsigned int i = 10, result = 1;
301         while (i <= number) {
302                 i *= 10;
303                 result++;
304         }
305         return result;
306 }
307
308 void fmt_output_subject(struct strbuf *filename,
309                         const char *subject,
310                         struct rev_info *info)
311 {
312         const char *suffix = info->patch_suffix;
313         int nr = info->nr;
314         int start_len = filename->len;
315         int max_len = start_len + FORMAT_PATCH_NAME_MAX - (strlen(suffix) + 1);
316
317         if (0 < info->reroll_count)
318                 strbuf_addf(filename, "v%d-", info->reroll_count);
319         strbuf_addf(filename, "%04d-%s", nr, subject);
320
321         if (max_len < filename->len)
322                 strbuf_setlen(filename, max_len);
323         strbuf_addstr(filename, suffix);
324 }
325
326 void fmt_output_commit(struct strbuf *filename,
327                        struct commit *commit,
328                        struct rev_info *info)
329 {
330         struct pretty_print_context ctx = {0};
331         struct strbuf subject = STRBUF_INIT;
332
333         format_commit_message(commit, "%f", &subject, &ctx);
334         fmt_output_subject(filename, subject.buf, info);
335         strbuf_release(&subject);
336 }
337
338 void log_write_email_headers(struct rev_info *opt, struct commit *commit,
339                              const char **subject_p,
340                              const char **extra_headers_p,
341                              int *need_8bit_cte_p)
342 {
343         const char *subject = NULL;
344         const char *extra_headers = opt->extra_headers;
345         const char *name = sha1_to_hex(commit->object.sha1);
346
347         *need_8bit_cte_p = 0; /* unknown */
348         if (opt->total > 0) {
349                 static char buffer[64];
350                 snprintf(buffer, sizeof(buffer),
351                          "Subject: [%s%s%0*d/%d] ",
352                          opt->subject_prefix,
353                          *opt->subject_prefix ? " " : "",
354                          digits_in_number(opt->total),
355                          opt->nr, opt->total);
356                 subject = buffer;
357         } else if (opt->total == 0 && opt->subject_prefix && *opt->subject_prefix) {
358                 static char buffer[256];
359                 snprintf(buffer, sizeof(buffer),
360                          "Subject: [%s] ",
361                          opt->subject_prefix);
362                 subject = buffer;
363         } else {
364                 subject = "Subject: ";
365         }
366
367         printf("From %s Mon Sep 17 00:00:00 2001\n", name);
368         graph_show_oneline(opt->graph);
369         if (opt->message_id) {
370                 printf("Message-Id: <%s>\n", opt->message_id);
371                 graph_show_oneline(opt->graph);
372         }
373         if (opt->ref_message_ids && opt->ref_message_ids->nr > 0) {
374                 int i, n;
375                 n = opt->ref_message_ids->nr;
376                 printf("In-Reply-To: <%s>\n", opt->ref_message_ids->items[n-1].string);
377                 for (i = 0; i < n; i++)
378                         printf("%s<%s>\n", (i > 0 ? "\t" : "References: "),
379                                opt->ref_message_ids->items[i].string);
380                 graph_show_oneline(opt->graph);
381         }
382         if (opt->mime_boundary) {
383                 static char subject_buffer[1024];
384                 static char buffer[1024];
385                 struct strbuf filename =  STRBUF_INIT;
386                 *need_8bit_cte_p = -1; /* NEVER */
387                 snprintf(subject_buffer, sizeof(subject_buffer) - 1,
388                          "%s"
389                          "MIME-Version: 1.0\n"
390                          "Content-Type: multipart/mixed;"
391                          " boundary=\"%s%s\"\n"
392                          "\n"
393                          "This is a multi-part message in MIME "
394                          "format.\n"
395                          "--%s%s\n"
396                          "Content-Type: text/plain; "
397                          "charset=UTF-8; format=fixed\n"
398                          "Content-Transfer-Encoding: 8bit\n\n",
399                          extra_headers ? extra_headers : "",
400                          mime_boundary_leader, opt->mime_boundary,
401                          mime_boundary_leader, opt->mime_boundary);
402                 extra_headers = subject_buffer;
403
404                 if (opt->numbered_files)
405                         strbuf_addf(&filename, "%d", opt->nr);
406                 else
407                         fmt_output_commit(&filename, commit, opt);
408                 snprintf(buffer, sizeof(buffer) - 1,
409                          "\n--%s%s\n"
410                          "Content-Type: text/x-patch;"
411                          " name=\"%s\"\n"
412                          "Content-Transfer-Encoding: 8bit\n"
413                          "Content-Disposition: %s;"
414                          " filename=\"%s\"\n\n",
415                          mime_boundary_leader, opt->mime_boundary,
416                          filename.buf,
417                          opt->no_inline ? "attachment" : "inline",
418                          filename.buf);
419                 opt->diffopt.stat_sep = buffer;
420                 strbuf_release(&filename);
421         }
422         *subject_p = subject;
423         *extra_headers_p = extra_headers;
424 }
425
426 static void show_sig_lines(struct rev_info *opt, int status, const char *bol)
427 {
428         const char *color, *reset, *eol;
429
430         color = diff_get_color_opt(&opt->diffopt,
431                                    status ? DIFF_WHITESPACE : DIFF_FRAGINFO);
432         reset = diff_get_color_opt(&opt->diffopt, DIFF_RESET);
433         while (*bol) {
434                 eol = strchrnul(bol, '\n');
435                 printf("%s%.*s%s%s", color, (int)(eol - bol), bol, reset,
436                        *eol ? "\n" : "");
437                 graph_show_oneline(opt->graph);
438                 bol = (*eol) ? (eol + 1) : eol;
439         }
440 }
441
442 static void show_signature(struct rev_info *opt, struct commit *commit)
443 {
444         struct strbuf payload = STRBUF_INIT;
445         struct strbuf signature = STRBUF_INIT;
446         struct strbuf gpg_output = STRBUF_INIT;
447         int status;
448
449         if (parse_signed_commit(commit, &payload, &signature) <= 0)
450                 goto out;
451
452         status = verify_signed_buffer(payload.buf, payload.len,
453                                       signature.buf, signature.len,
454                                       &gpg_output, NULL);
455         if (status && !gpg_output.len)
456                 strbuf_addstr(&gpg_output, "No signature\n");
457
458         show_sig_lines(opt, status, gpg_output.buf);
459
460  out:
461         strbuf_release(&gpg_output);
462         strbuf_release(&payload);
463         strbuf_release(&signature);
464 }
465
466 static int which_parent(const unsigned char *sha1, const struct commit *commit)
467 {
468         int nth;
469         const struct commit_list *parent;
470
471         for (nth = 0, parent = commit->parents; parent; parent = parent->next) {
472                 if (!hashcmp(parent->item->object.sha1, sha1))
473                         return nth;
474                 nth++;
475         }
476         return -1;
477 }
478
479 static int is_common_merge(const struct commit *commit)
480 {
481         return (commit->parents
482                 && commit->parents->next
483                 && !commit->parents->next->next);
484 }
485
486 static void show_one_mergetag(struct commit *commit,
487                               struct commit_extra_header *extra,
488                               void *data)
489 {
490         struct rev_info *opt = (struct rev_info *)data;
491         unsigned char sha1[20];
492         struct tag *tag;
493         struct strbuf verify_message;
494         int status, nth;
495         size_t payload_size, gpg_message_offset;
496
497         hash_sha1_file(extra->value, extra->len, typename(OBJ_TAG), sha1);
498         tag = lookup_tag(sha1);
499         if (!tag)
500                 return; /* error message already given */
501
502         strbuf_init(&verify_message, 256);
503         if (parse_tag_buffer(tag, extra->value, extra->len))
504                 strbuf_addstr(&verify_message, "malformed mergetag\n");
505         else if (is_common_merge(commit) &&
506                  !hashcmp(tag->tagged->sha1,
507                           commit->parents->next->item->object.sha1))
508                 strbuf_addf(&verify_message,
509                             "merged tag '%s'\n", tag->tag);
510         else if ((nth = which_parent(tag->tagged->sha1, commit)) < 0)
511                 strbuf_addf(&verify_message, "tag %s names a non-parent %s\n",
512                                     tag->tag, tag->tagged->sha1);
513         else
514                 strbuf_addf(&verify_message,
515                             "parent #%d, tagged '%s'\n", nth + 1, tag->tag);
516         gpg_message_offset = verify_message.len;
517
518         payload_size = parse_signature(extra->value, extra->len);
519         status = -1;
520         if (extra->len > payload_size) {
521                 /* could have a good signature */
522                 if (!verify_signed_buffer(extra->value, payload_size,
523                                           extra->value + payload_size,
524                                           extra->len - payload_size,
525                                           &verify_message, NULL))
526                         status = 0; /* good */
527                 else if (verify_message.len <= gpg_message_offset)
528                         strbuf_addstr(&verify_message, "No signature\n");
529                 /* otherwise we couldn't verify, which is shown as bad */
530         }
531
532         show_sig_lines(opt, status, verify_message.buf);
533         strbuf_release(&verify_message);
534 }
535
536 static void show_mergetag(struct rev_info *opt, struct commit *commit)
537 {
538         for_each_mergetag(show_one_mergetag, commit, opt);
539 }
540
541 void show_log(struct rev_info *opt)
542 {
543         struct strbuf msgbuf = STRBUF_INIT;
544         struct log_info *log = opt->loginfo;
545         struct commit *commit = log->commit, *parent = log->parent;
546         int abbrev_commit = opt->abbrev_commit ? opt->abbrev : 40;
547         const char *extra_headers = opt->extra_headers;
548         struct pretty_print_context ctx = {0};
549
550         opt->loginfo = NULL;
551         if (!opt->verbose_header) {
552                 graph_show_commit(opt->graph);
553
554                 if (!opt->graph)
555                         put_revision_mark(opt, commit);
556                 fputs(find_unique_abbrev(commit->object.sha1, abbrev_commit), stdout);
557                 if (opt->print_parents)
558                         show_parents(commit, abbrev_commit);
559                 if (opt->children.name)
560                         show_children(opt, commit, abbrev_commit);
561                 show_decorations(opt, commit);
562                 if (opt->graph && !graph_is_commit_finished(opt->graph)) {
563                         putchar('\n');
564                         graph_show_remainder(opt->graph);
565                 }
566                 putchar(opt->diffopt.line_termination);
567                 return;
568         }
569
570         /*
571          * If use_terminator is set, we already handled any record termination
572          * at the end of the last record.
573          * Otherwise, add a diffopt.line_termination character before all
574          * entries but the first.  (IOW, as a separator between entries)
575          */
576         if (opt->shown_one && !opt->use_terminator) {
577                 /*
578                  * If entries are separated by a newline, the output
579                  * should look human-readable.  If the last entry ended
580                  * with a newline, print the graph output before this
581                  * newline.  Otherwise it will end up as a completely blank
582                  * line and will look like a gap in the graph.
583                  *
584                  * If the entry separator is not a newline, the output is
585                  * primarily intended for programmatic consumption, and we
586                  * never want the extra graph output before the entry
587                  * separator.
588                  */
589                 if (opt->diffopt.line_termination == '\n' &&
590                     !opt->missing_newline)
591                         graph_show_padding(opt->graph);
592                 putchar(opt->diffopt.line_termination);
593         }
594         opt->shown_one = 1;
595
596         /*
597          * If the history graph was requested,
598          * print the graph, up to this commit's line
599          */
600         graph_show_commit(opt->graph);
601
602         /*
603          * Print header line of header..
604          */
605
606         if (opt->commit_format == CMIT_FMT_EMAIL) {
607                 log_write_email_headers(opt, commit, &ctx.subject, &extra_headers,
608                                         &ctx.need_8bit_cte);
609         } else if (opt->commit_format != CMIT_FMT_USERFORMAT) {
610                 fputs(diff_get_color_opt(&opt->diffopt, DIFF_COMMIT), stdout);
611                 if (opt->commit_format != CMIT_FMT_ONELINE)
612                         fputs("commit ", stdout);
613
614                 if (!opt->graph)
615                         put_revision_mark(opt, commit);
616                 fputs(find_unique_abbrev(commit->object.sha1, abbrev_commit),
617                       stdout);
618                 if (opt->print_parents)
619                         show_parents(commit, abbrev_commit);
620                 if (opt->children.name)
621                         show_children(opt, commit, abbrev_commit);
622                 if (parent)
623                         printf(" (from %s)",
624                                find_unique_abbrev(parent->object.sha1,
625                                                   abbrev_commit));
626                 fputs(diff_get_color_opt(&opt->diffopt, DIFF_RESET), stdout);
627                 show_decorations(opt, commit);
628                 if (opt->commit_format == CMIT_FMT_ONELINE) {
629                         putchar(' ');
630                 } else {
631                         putchar('\n');
632                         graph_show_oneline(opt->graph);
633                 }
634                 if (opt->reflog_info) {
635                         /*
636                          * setup_revisions() ensures that opt->reflog_info
637                          * and opt->graph cannot both be set,
638                          * so we don't need to worry about printing the
639                          * graph info here.
640                          */
641                         show_reflog_message(opt->reflog_info,
642                                             opt->commit_format == CMIT_FMT_ONELINE,
643                                             &opt->date_mode,
644                                             opt->date_mode_explicit);
645                         if (opt->commit_format == CMIT_FMT_ONELINE)
646                                 return;
647                 }
648         }
649
650         if (opt->show_signature) {
651                 show_signature(opt, commit);
652                 show_mergetag(opt, commit);
653         }
654
655         if (!get_cached_commit_buffer(commit, NULL))
656                 return;
657
658         if (opt->show_notes) {
659                 int raw;
660                 struct strbuf notebuf = STRBUF_INIT;
661
662                 raw = (opt->commit_format == CMIT_FMT_USERFORMAT);
663                 format_display_notes(commit->object.sha1, &notebuf,
664                                      get_log_output_encoding(), raw);
665                 ctx.notes_message = notebuf.len
666                         ? strbuf_detach(&notebuf, NULL)
667                         : xcalloc(1, 1);
668         }
669
670         /*
671          * And then the pretty-printed message itself
672          */
673         if (ctx.need_8bit_cte >= 0 && opt->add_signoff)
674                 ctx.need_8bit_cte =
675                         has_non_ascii(fmt_name(getenv("GIT_COMMITTER_NAME"),
676                                                getenv("GIT_COMMITTER_EMAIL")));
677         ctx.date_mode = opt->date_mode;
678         ctx.date_mode_explicit = opt->date_mode_explicit;
679         ctx.abbrev = opt->diffopt.abbrev;
680         ctx.after_subject = extra_headers;
681         ctx.preserve_subject = opt->preserve_subject;
682         ctx.reflog_info = opt->reflog_info;
683         ctx.fmt = opt->commit_format;
684         ctx.mailmap = opt->mailmap;
685         ctx.color = opt->diffopt.use_color;
686         ctx.output_encoding = get_log_output_encoding();
687         if (opt->from_ident.mail_begin && opt->from_ident.name_begin)
688                 ctx.from_ident = &opt->from_ident;
689         pretty_print_commit(&ctx, commit, &msgbuf);
690
691         if (opt->add_signoff)
692                 append_signoff(&msgbuf, 0, APPEND_SIGNOFF_DEDUP);
693
694         if ((ctx.fmt != CMIT_FMT_USERFORMAT) &&
695             ctx.notes_message && *ctx.notes_message) {
696                 if (ctx.fmt == CMIT_FMT_EMAIL) {
697                         strbuf_addstr(&msgbuf, "---\n");
698                         opt->shown_dashes = 1;
699                 }
700                 strbuf_addstr(&msgbuf, ctx.notes_message);
701         }
702
703         if (opt->show_log_size) {
704                 printf("log size %i\n", (int)msgbuf.len);
705                 graph_show_oneline(opt->graph);
706         }
707
708         /*
709          * Set opt->missing_newline if msgbuf doesn't
710          * end in a newline (including if it is empty)
711          */
712         if (!msgbuf.len || msgbuf.buf[msgbuf.len - 1] != '\n')
713                 opt->missing_newline = 1;
714         else
715                 opt->missing_newline = 0;
716
717         if (opt->graph)
718                 graph_show_commit_msg(opt->graph, &msgbuf);
719         else
720                 fwrite(msgbuf.buf, sizeof(char), msgbuf.len, stdout);
721         if (opt->use_terminator && !commit_format_is_empty(opt->commit_format)) {
722                 if (!opt->missing_newline)
723                         graph_show_padding(opt->graph);
724                 putchar(opt->diffopt.line_termination);
725         }
726
727         strbuf_release(&msgbuf);
728         free(ctx.notes_message);
729 }
730
731 int log_tree_diff_flush(struct rev_info *opt)
732 {
733         opt->shown_dashes = 0;
734         diffcore_std(&opt->diffopt);
735
736         if (diff_queue_is_empty()) {
737                 int saved_fmt = opt->diffopt.output_format;
738                 opt->diffopt.output_format = DIFF_FORMAT_NO_OUTPUT;
739                 diff_flush(&opt->diffopt);
740                 opt->diffopt.output_format = saved_fmt;
741                 return 0;
742         }
743
744         if (opt->loginfo && !opt->no_commit_id) {
745                 show_log(opt);
746                 if ((opt->diffopt.output_format & ~DIFF_FORMAT_NO_OUTPUT) &&
747                     opt->verbose_header &&
748                     opt->commit_format != CMIT_FMT_ONELINE &&
749                     !commit_format_is_empty(opt->commit_format)) {
750                         /*
751                          * When showing a verbose header (i.e. log message),
752                          * and not in --pretty=oneline format, we would want
753                          * an extra newline between the end of log and the
754                          * diff/diffstat output for readability.
755                          */
756                         int pch = DIFF_FORMAT_DIFFSTAT | DIFF_FORMAT_PATCH;
757                         if (opt->diffopt.output_prefix) {
758                                 struct strbuf *msg = NULL;
759                                 msg = opt->diffopt.output_prefix(&opt->diffopt,
760                                         opt->diffopt.output_prefix_data);
761                                 fwrite(msg->buf, msg->len, 1, stdout);
762                         }
763
764                         /*
765                          * We may have shown three-dashes line early
766                          * between notes and the log message, in which
767                          * case we only want a blank line after the
768                          * notes without (an extra) three-dashes line.
769                          * Otherwise, we show the three-dashes line if
770                          * we are showing the patch with diffstat, but
771                          * in that case, there is no extra blank line
772                          * after the three-dashes line.
773                          */
774                         if (!opt->shown_dashes &&
775                             (pch & opt->diffopt.output_format) == pch)
776                                 printf("---");
777                         putchar('\n');
778                 }
779         }
780         diff_flush(&opt->diffopt);
781         return 1;
782 }
783
784 static int do_diff_combined(struct rev_info *opt, struct commit *commit)
785 {
786         diff_tree_combined_merge(commit, opt->dense_combined_merges, opt);
787         return !opt->loginfo;
788 }
789
790 /*
791  * Show the diff of a commit.
792  *
793  * Return true if we printed any log info messages
794  */
795 static int log_tree_diff(struct rev_info *opt, struct commit *commit, struct log_info *log)
796 {
797         int showed_log;
798         struct commit_list *parents;
799         unsigned const char *sha1;
800
801         if (!opt->diff && !DIFF_OPT_TST(&opt->diffopt, EXIT_WITH_STATUS))
802                 return 0;
803
804         parse_commit_or_die(commit);
805         sha1 = commit->tree->object.sha1;
806
807         /* Root commit? */
808         parents = get_saved_parents(opt, commit);
809         if (!parents) {
810                 if (opt->show_root_diff) {
811                         diff_root_tree_sha1(sha1, "", &opt->diffopt);
812                         log_tree_diff_flush(opt);
813                 }
814                 return !opt->loginfo;
815         }
816
817         /* More than one parent? */
818         if (parents && parents->next) {
819                 if (opt->ignore_merges)
820                         return 0;
821                 else if (opt->combine_merges)
822                         return do_diff_combined(opt, commit);
823                 else if (opt->first_parent_only) {
824                         /*
825                          * Generate merge log entry only for the first
826                          * parent, showing summary diff of the others
827                          * we merged _in_.
828                          */
829                         parse_commit_or_die(parents->item);
830                         diff_tree_sha1(parents->item->tree->object.sha1,
831                                        sha1, "", &opt->diffopt);
832                         log_tree_diff_flush(opt);
833                         return !opt->loginfo;
834                 }
835
836                 /* If we show individual diffs, show the parent info */
837                 log->parent = parents->item;
838         }
839
840         showed_log = 0;
841         for (;;) {
842                 struct commit *parent = parents->item;
843
844                 parse_commit_or_die(parent);
845                 diff_tree_sha1(parent->tree->object.sha1,
846                                sha1, "", &opt->diffopt);
847                 log_tree_diff_flush(opt);
848
849                 showed_log |= !opt->loginfo;
850
851                 /* Set up the log info for the next parent, if any.. */
852                 parents = parents->next;
853                 if (!parents)
854                         break;
855                 log->parent = parents->item;
856                 opt->loginfo = log;
857         }
858         return showed_log;
859 }
860
861 int log_tree_commit(struct rev_info *opt, struct commit *commit)
862 {
863         struct log_info log;
864         int shown;
865
866         log.commit = commit;
867         log.parent = NULL;
868         opt->loginfo = &log;
869
870         if (opt->line_level_traverse)
871                 return line_log_print(opt, commit);
872
873         if (opt->track_linear && !opt->linear && !opt->reverse_output_stage)
874                 printf("\n%s\n", opt->break_bar);
875         shown = log_tree_diff(opt, commit, &log);
876         if (!shown && opt->loginfo && opt->always_show_header) {
877                 log.parent = NULL;
878                 show_log(opt);
879                 shown = 1;
880         }
881         if (opt->track_linear && !opt->linear && opt->reverse_output_stage)
882                 printf("\n%s\n", opt->break_bar);
883         opt->loginfo = NULL;
884         maybe_flush_or_die(stdout, "stdout");
885         return shown;
886 }