http-backend: respect CONTENT_LENGTH for receive-pack
[git] / log-tree.c
1 #include "cache.h"
2 #include "config.h"
3 #include "diff.h"
4 #include "commit.h"
5 #include "tag.h"
6 #include "graph.h"
7 #include "log-tree.h"
8 #include "reflog-walk.h"
9 #include "refs.h"
10 #include "string-list.h"
11 #include "color.h"
12 #include "gpg-interface.h"
13 #include "sequencer.h"
14 #include "line-log.h"
15
16 static struct decoration name_decoration = { "object names" };
17 static int decoration_loaded;
18 static int decoration_flags;
19
20 static char decoration_colors[][COLOR_MAXLEN] = {
21         GIT_COLOR_RESET,
22         GIT_COLOR_BOLD_GREEN,   /* REF_LOCAL */
23         GIT_COLOR_BOLD_RED,     /* REF_REMOTE */
24         GIT_COLOR_BOLD_YELLOW,  /* REF_TAG */
25         GIT_COLOR_BOLD_MAGENTA, /* REF_STASH */
26         GIT_COLOR_BOLD_CYAN,    /* REF_HEAD */
27         GIT_COLOR_BOLD_BLUE,    /* GRAFTED */
28 };
29
30 static const char *decorate_get_color(int decorate_use_color, enum decoration_type ix)
31 {
32         if (want_color(decorate_use_color))
33                 return decoration_colors[ix];
34         return "";
35 }
36
37 static int parse_decorate_color_slot(const char *slot)
38 {
39         /*
40          * We're comparing with 'ignore-case' on
41          * (because config.c sets them all tolower),
42          * but let's match the letters in the literal
43          * string values here with how they are
44          * documented in Documentation/config.txt, for
45          * consistency.
46          *
47          * We love being consistent, don't we?
48          */
49         if (!strcasecmp(slot, "branch"))
50                 return DECORATION_REF_LOCAL;
51         if (!strcasecmp(slot, "remoteBranch"))
52                 return DECORATION_REF_REMOTE;
53         if (!strcasecmp(slot, "tag"))
54                 return DECORATION_REF_TAG;
55         if (!strcasecmp(slot, "stash"))
56                 return DECORATION_REF_STASH;
57         if (!strcasecmp(slot, "HEAD"))
58                 return DECORATION_REF_HEAD;
59         return -1;
60 }
61
62 int parse_decorate_color_config(const char *var, const char *slot_name, const char *value)
63 {
64         int slot = parse_decorate_color_slot(slot_name);
65         if (slot < 0)
66                 return 0;
67         if (!value)
68                 return config_error_nonbool(var);
69         return color_parse(value, decoration_colors[slot]);
70 }
71
72 /*
73  * log-tree.c uses DIFF_OPT_TST for determining whether to use color
74  * for showing the commit sha1, use the same check for --decorate
75  */
76 #define decorate_get_color_opt(o, ix) \
77         decorate_get_color((o)->use_color, ix)
78
79 void add_name_decoration(enum decoration_type type, const char *name, struct object *obj)
80 {
81         struct name_decoration *res;
82         FLEX_ALLOC_STR(res, name, name);
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         struct decoration_filter *filter = (struct decoration_filter *)cb_data;
98
99         if (filter && !ref_filter_match(refname,
100                               filter->include_ref_pattern,
101                               filter->exclude_ref_pattern))
102                 return 0;
103
104         if (starts_with(refname, git_replace_ref_base)) {
105                 struct object_id original_oid;
106                 if (!check_replace_refs)
107                         return 0;
108                 if (get_oid_hex(refname + strlen(git_replace_ref_base),
109                                 &original_oid)) {
110                         warning("invalid replace ref %s", refname);
111                         return 0;
112                 }
113                 obj = parse_object(&original_oid);
114                 if (obj)
115                         add_name_decoration(DECORATION_GRAFTED, "replaced", obj);
116                 return 0;
117         }
118
119         obj = parse_object(oid);
120         if (!obj)
121                 return 0;
122
123         if (starts_with(refname, "refs/heads/"))
124                 type = DECORATION_REF_LOCAL;
125         else if (starts_with(refname, "refs/remotes/"))
126                 type = DECORATION_REF_REMOTE;
127         else if (starts_with(refname, "refs/tags/"))
128                 type = DECORATION_REF_TAG;
129         else if (!strcmp(refname, "refs/stash"))
130                 type = DECORATION_REF_STASH;
131         else if (!strcmp(refname, "HEAD"))
132                 type = DECORATION_REF_HEAD;
133
134         add_name_decoration(type, refname, obj);
135         while (obj->type == OBJ_TAG) {
136                 obj = ((struct tag *)obj)->tagged;
137                 if (!obj)
138                         break;
139                 if (!obj->parsed)
140                         parse_object(&obj->oid);
141                 add_name_decoration(DECORATION_REF_TAG, refname, obj);
142         }
143         return 0;
144 }
145
146 static int add_graft_decoration(const struct commit_graft *graft, void *cb_data)
147 {
148         struct commit *commit = lookup_commit(&graft->oid);
149         if (!commit)
150                 return 0;
151         add_name_decoration(DECORATION_GRAFTED, "grafted", &commit->object);
152         return 0;
153 }
154
155 void load_ref_decorations(struct decoration_filter *filter, int flags)
156 {
157         if (!decoration_loaded) {
158                 if (filter) {
159                         struct string_list_item *item;
160                         for_each_string_list_item(item, filter->exclude_ref_pattern) {
161                                 normalize_glob_ref(item, NULL, item->string);
162                         }
163                         for_each_string_list_item(item, filter->include_ref_pattern) {
164                                 normalize_glob_ref(item, NULL, item->string);
165                         }
166                 }
167                 decoration_loaded = 1;
168                 decoration_flags = flags;
169                 for_each_ref(add_ref_decoration, filter);
170                 head_ref(add_ref_decoration, filter);
171                 for_each_commit_graft(add_graft_decoration, filter);
172         }
173 }
174
175 static void show_parents(struct commit *commit, int abbrev, FILE *file)
176 {
177         struct commit_list *p;
178         for (p = commit->parents; p ; p = p->next) {
179                 struct commit *parent = p->item;
180                 fprintf(file, " %s", find_unique_abbrev(&parent->object.oid, abbrev));
181         }
182 }
183
184 static void show_children(struct rev_info *opt, struct commit *commit, int abbrev)
185 {
186         struct commit_list *p = lookup_decoration(&opt->children, &commit->object);
187         for ( ; p; p = p->next) {
188                 fprintf(opt->diffopt.file, " %s", find_unique_abbrev(&p->item->object.oid, abbrev));
189         }
190 }
191
192 /*
193  * Do we have HEAD in the output, and also the branch it points at?
194  * If so, find that decoration entry for that current branch.
195  */
196 static const struct name_decoration *current_pointed_by_HEAD(const struct name_decoration *decoration)
197 {
198         const struct name_decoration *list, *head = NULL;
199         const char *branch_name = NULL;
200         int rru_flags;
201
202         /* First find HEAD */
203         for (list = decoration; list; list = list->next)
204                 if (list->type == DECORATION_REF_HEAD) {
205                         head = list;
206                         break;
207                 }
208         if (!head)
209                 return NULL;
210
211         /* Now resolve and find the matching current branch */
212         branch_name = resolve_ref_unsafe("HEAD", 0, NULL, &rru_flags);
213         if (!branch_name || !(rru_flags & REF_ISSYMREF))
214                 return NULL;
215
216         if (!starts_with(branch_name, "refs/"))
217                 return NULL;
218
219         /* OK, do we have that ref in the list? */
220         for (list = decoration; list; list = list->next)
221                 if ((list->type == DECORATION_REF_LOCAL) &&
222                     !strcmp(branch_name, list->name)) {
223                         return list;
224                 }
225
226         return NULL;
227 }
228
229 static void show_name(struct strbuf *sb, const struct name_decoration *decoration)
230 {
231         if (decoration_flags == DECORATE_SHORT_REFS)
232                 strbuf_addstr(sb, prettify_refname(decoration->name));
233         else
234                 strbuf_addstr(sb, decoration->name);
235 }
236
237 /*
238  * The caller makes sure there is no funny color before calling.
239  * format_decorations_extended makes sure the same after return.
240  */
241 void format_decorations_extended(struct strbuf *sb,
242                         const struct commit *commit,
243                         int use_color,
244                         const char *prefix,
245                         const char *separator,
246                         const char *suffix)
247 {
248         const struct name_decoration *decoration;
249         const struct name_decoration *current_and_HEAD;
250         const char *color_commit =
251                 diff_get_color(use_color, DIFF_COMMIT);
252         const char *color_reset =
253                 decorate_get_color(use_color, DECORATION_NONE);
254
255         decoration = get_name_decoration(&commit->object);
256         if (!decoration)
257                 return;
258
259         current_and_HEAD = current_pointed_by_HEAD(decoration);
260         while (decoration) {
261                 /*
262                  * When both current and HEAD are there, only
263                  * show HEAD->current where HEAD would have
264                  * appeared, skipping the entry for current.
265                  */
266                 if (decoration != current_and_HEAD) {
267                         strbuf_addstr(sb, color_commit);
268                         strbuf_addstr(sb, prefix);
269                         strbuf_addstr(sb, color_reset);
270                         strbuf_addstr(sb, decorate_get_color(use_color, decoration->type));
271                         if (decoration->type == DECORATION_REF_TAG)
272                                 strbuf_addstr(sb, "tag: ");
273
274                         show_name(sb, decoration);
275
276                         if (current_and_HEAD &&
277                             decoration->type == DECORATION_REF_HEAD) {
278                                 strbuf_addstr(sb, " -> ");
279                                 strbuf_addstr(sb, color_reset);
280                                 strbuf_addstr(sb, decorate_get_color(use_color, current_and_HEAD->type));
281                                 show_name(sb, current_and_HEAD);
282                         }
283                         strbuf_addstr(sb, color_reset);
284
285                         prefix = separator;
286                 }
287                 decoration = decoration->next;
288         }
289         strbuf_addstr(sb, color_commit);
290         strbuf_addstr(sb, suffix);
291         strbuf_addstr(sb, color_reset);
292 }
293
294 void show_decorations(struct rev_info *opt, struct commit *commit)
295 {
296         struct strbuf sb = STRBUF_INIT;
297
298         if (opt->show_source && commit->util)
299                 fprintf(opt->diffopt.file, "\t%s", (char *) commit->util);
300         if (!opt->show_decorations)
301                 return;
302         format_decorations(&sb, commit, opt->diffopt.use_color);
303         fputs(sb.buf, opt->diffopt.file);
304         strbuf_release(&sb);
305 }
306
307 static unsigned int digits_in_number(unsigned int number)
308 {
309         unsigned int i = 10, result = 1;
310         while (i <= number) {
311                 i *= 10;
312                 result++;
313         }
314         return result;
315 }
316
317 void fmt_output_subject(struct strbuf *filename,
318                         const char *subject,
319                         struct rev_info *info)
320 {
321         const char *suffix = info->patch_suffix;
322         int nr = info->nr;
323         int start_len = filename->len;
324         int max_len = start_len + FORMAT_PATCH_NAME_MAX - (strlen(suffix) + 1);
325
326         if (0 < info->reroll_count)
327                 strbuf_addf(filename, "v%d-", info->reroll_count);
328         strbuf_addf(filename, "%04d-%s", nr, subject);
329
330         if (max_len < filename->len)
331                 strbuf_setlen(filename, max_len);
332         strbuf_addstr(filename, suffix);
333 }
334
335 void fmt_output_commit(struct strbuf *filename,
336                        struct commit *commit,
337                        struct rev_info *info)
338 {
339         struct pretty_print_context ctx = {0};
340         struct strbuf subject = STRBUF_INIT;
341
342         format_commit_message(commit, "%f", &subject, &ctx);
343         fmt_output_subject(filename, subject.buf, info);
344         strbuf_release(&subject);
345 }
346
347 void fmt_output_email_subject(struct strbuf *sb, struct rev_info *opt)
348 {
349         if (opt->total > 0) {
350                 strbuf_addf(sb, "Subject: [%s%s%0*d/%d] ",
351                             opt->subject_prefix,
352                             *opt->subject_prefix ? " " : "",
353                             digits_in_number(opt->total),
354                             opt->nr, opt->total);
355         } else if (opt->total == 0 && opt->subject_prefix && *opt->subject_prefix) {
356                 strbuf_addf(sb, "Subject: [%s] ",
357                             opt->subject_prefix);
358         } else {
359                 strbuf_addstr(sb, "Subject: ");
360         }
361 }
362
363 void log_write_email_headers(struct rev_info *opt, struct commit *commit,
364                              const char **extra_headers_p,
365                              int *need_8bit_cte_p,
366                              int maybe_multipart)
367 {
368         const char *extra_headers = opt->extra_headers;
369         const char *name = oid_to_hex(opt->zero_commit ?
370                                       &null_oid : &commit->object.oid);
371
372         *need_8bit_cte_p = 0; /* unknown */
373
374         fprintf(opt->diffopt.file, "From %s Mon Sep 17 00:00:00 2001\n", name);
375         graph_show_oneline(opt->graph);
376         if (opt->message_id) {
377                 fprintf(opt->diffopt.file, "Message-Id: <%s>\n", opt->message_id);
378                 graph_show_oneline(opt->graph);
379         }
380         if (opt->ref_message_ids && opt->ref_message_ids->nr > 0) {
381                 int i, n;
382                 n = opt->ref_message_ids->nr;
383                 fprintf(opt->diffopt.file, "In-Reply-To: <%s>\n", opt->ref_message_ids->items[n-1].string);
384                 for (i = 0; i < n; i++)
385                         fprintf(opt->diffopt.file, "%s<%s>\n", (i > 0 ? "\t" : "References: "),
386                                opt->ref_message_ids->items[i].string);
387                 graph_show_oneline(opt->graph);
388         }
389         if (opt->mime_boundary && maybe_multipart) {
390                 static struct strbuf subject_buffer = STRBUF_INIT;
391                 static struct strbuf buffer = STRBUF_INIT;
392                 struct strbuf filename =  STRBUF_INIT;
393                 *need_8bit_cte_p = -1; /* NEVER */
394
395                 strbuf_reset(&subject_buffer);
396                 strbuf_reset(&buffer);
397
398                 strbuf_addf(&subject_buffer,
399                          "%s"
400                          "MIME-Version: 1.0\n"
401                          "Content-Type: multipart/mixed;"
402                          " boundary=\"%s%s\"\n"
403                          "\n"
404                          "This is a multi-part message in MIME "
405                          "format.\n"
406                          "--%s%s\n"
407                          "Content-Type: text/plain; "
408                          "charset=UTF-8; format=fixed\n"
409                          "Content-Transfer-Encoding: 8bit\n\n",
410                          extra_headers ? extra_headers : "",
411                          mime_boundary_leader, opt->mime_boundary,
412                          mime_boundary_leader, opt->mime_boundary);
413                 extra_headers = subject_buffer.buf;
414
415                 if (opt->numbered_files)
416                         strbuf_addf(&filename, "%d", opt->nr);
417                 else
418                         fmt_output_commit(&filename, commit, opt);
419                 strbuf_addf(&buffer,
420                          "\n--%s%s\n"
421                          "Content-Type: text/x-patch;"
422                          " name=\"%s\"\n"
423                          "Content-Transfer-Encoding: 8bit\n"
424                          "Content-Disposition: %s;"
425                          " filename=\"%s\"\n\n",
426                          mime_boundary_leader, opt->mime_boundary,
427                          filename.buf,
428                          opt->no_inline ? "attachment" : "inline",
429                          filename.buf);
430                 opt->diffopt.stat_sep = buffer.buf;
431                 strbuf_release(&filename);
432         }
433         *extra_headers_p = extra_headers;
434 }
435
436 static void show_sig_lines(struct rev_info *opt, int status, const char *bol)
437 {
438         const char *color, *reset, *eol;
439
440         color = diff_get_color_opt(&opt->diffopt,
441                                    status ? DIFF_WHITESPACE : DIFF_FRAGINFO);
442         reset = diff_get_color_opt(&opt->diffopt, DIFF_RESET);
443         while (*bol) {
444                 eol = strchrnul(bol, '\n');
445                 fprintf(opt->diffopt.file, "%s%.*s%s%s", color, (int)(eol - bol), bol, reset,
446                        *eol ? "\n" : "");
447                 graph_show_oneline(opt->graph);
448                 bol = (*eol) ? (eol + 1) : eol;
449         }
450 }
451
452 static void show_signature(struct rev_info *opt, struct commit *commit)
453 {
454         struct strbuf payload = STRBUF_INIT;
455         struct strbuf signature = STRBUF_INIT;
456         struct strbuf gpg_output = STRBUF_INIT;
457         int status;
458
459         if (parse_signed_commit(commit, &payload, &signature) <= 0)
460                 goto out;
461
462         status = verify_signed_buffer(payload.buf, payload.len,
463                                       signature.buf, signature.len,
464                                       &gpg_output, NULL);
465         if (status && !gpg_output.len)
466                 strbuf_addstr(&gpg_output, "No signature\n");
467
468         show_sig_lines(opt, status, gpg_output.buf);
469
470  out:
471         strbuf_release(&gpg_output);
472         strbuf_release(&payload);
473         strbuf_release(&signature);
474 }
475
476 static int which_parent(const struct object_id *oid, const struct commit *commit)
477 {
478         int nth;
479         const struct commit_list *parent;
480
481         for (nth = 0, parent = commit->parents; parent; parent = parent->next) {
482                 if (!oidcmp(&parent->item->object.oid, oid))
483                         return nth;
484                 nth++;
485         }
486         return -1;
487 }
488
489 static int is_common_merge(const struct commit *commit)
490 {
491         return (commit->parents
492                 && commit->parents->next
493                 && !commit->parents->next->next);
494 }
495
496 static int show_one_mergetag(struct commit *commit,
497                              struct commit_extra_header *extra,
498                              void *data)
499 {
500         struct rev_info *opt = (struct rev_info *)data;
501         struct object_id oid;
502         struct tag *tag;
503         struct strbuf verify_message;
504         int status, nth;
505         size_t payload_size, gpg_message_offset;
506
507         hash_object_file(extra->value, extra->len, type_name(OBJ_TAG), &oid);
508         tag = lookup_tag(&oid);
509         if (!tag)
510                 return -1; /* error message already given */
511
512         strbuf_init(&verify_message, 256);
513         if (parse_tag_buffer(tag, extra->value, extra->len))
514                 strbuf_addstr(&verify_message, "malformed mergetag\n");
515         else if (is_common_merge(commit) &&
516                  !oidcmp(&tag->tagged->oid,
517                           &commit->parents->next->item->object.oid))
518                 strbuf_addf(&verify_message,
519                             "merged tag '%s'\n", tag->tag);
520         else if ((nth = which_parent(&tag->tagged->oid, commit)) < 0)
521                 strbuf_addf(&verify_message, "tag %s names a non-parent %s\n",
522                                     tag->tag, tag->tagged->oid.hash);
523         else
524                 strbuf_addf(&verify_message,
525                             "parent #%d, tagged '%s'\n", nth + 1, tag->tag);
526         gpg_message_offset = verify_message.len;
527
528         payload_size = parse_signature(extra->value, extra->len);
529         status = -1;
530         if (extra->len > payload_size) {
531                 /* could have a good signature */
532                 if (!verify_signed_buffer(extra->value, payload_size,
533                                           extra->value + payload_size,
534                                           extra->len - payload_size,
535                                           &verify_message, NULL))
536                         status = 0; /* good */
537                 else if (verify_message.len <= gpg_message_offset)
538                         strbuf_addstr(&verify_message, "No signature\n");
539                 /* otherwise we couldn't verify, which is shown as bad */
540         }
541
542         show_sig_lines(opt, status, verify_message.buf);
543         strbuf_release(&verify_message);
544         return 0;
545 }
546
547 static int show_mergetag(struct rev_info *opt, struct commit *commit)
548 {
549         return for_each_mergetag(show_one_mergetag, commit, opt);
550 }
551
552 void show_log(struct rev_info *opt)
553 {
554         struct strbuf msgbuf = STRBUF_INIT;
555         struct log_info *log = opt->loginfo;
556         struct commit *commit = log->commit, *parent = log->parent;
557         int abbrev_commit = opt->abbrev_commit ? opt->abbrev : GIT_SHA1_HEXSZ;
558         const char *extra_headers = opt->extra_headers;
559         struct pretty_print_context ctx = {0};
560
561         opt->loginfo = NULL;
562         if (!opt->verbose_header) {
563                 graph_show_commit(opt->graph);
564
565                 if (!opt->graph)
566                         put_revision_mark(opt, commit);
567                 fputs(find_unique_abbrev(&commit->object.oid, abbrev_commit), opt->diffopt.file);
568                 if (opt->print_parents)
569                         show_parents(commit, abbrev_commit, opt->diffopt.file);
570                 if (opt->children.name)
571                         show_children(opt, commit, abbrev_commit);
572                 show_decorations(opt, commit);
573                 if (opt->graph && !graph_is_commit_finished(opt->graph)) {
574                         putc('\n', opt->diffopt.file);
575                         graph_show_remainder(opt->graph);
576                 }
577                 putc(opt->diffopt.line_termination, opt->diffopt.file);
578                 return;
579         }
580
581         /*
582          * If use_terminator is set, we already handled any record termination
583          * at the end of the last record.
584          * Otherwise, add a diffopt.line_termination character before all
585          * entries but the first.  (IOW, as a separator between entries)
586          */
587         if (opt->shown_one && !opt->use_terminator) {
588                 /*
589                  * If entries are separated by a newline, the output
590                  * should look human-readable.  If the last entry ended
591                  * with a newline, print the graph output before this
592                  * newline.  Otherwise it will end up as a completely blank
593                  * line and will look like a gap in the graph.
594                  *
595                  * If the entry separator is not a newline, the output is
596                  * primarily intended for programmatic consumption, and we
597                  * never want the extra graph output before the entry
598                  * separator.
599                  */
600                 if (opt->diffopt.line_termination == '\n' &&
601                     !opt->missing_newline)
602                         graph_show_padding(opt->graph);
603                 putc(opt->diffopt.line_termination, opt->diffopt.file);
604         }
605         opt->shown_one = 1;
606
607         /*
608          * If the history graph was requested,
609          * print the graph, up to this commit's line
610          */
611         graph_show_commit(opt->graph);
612
613         /*
614          * Print header line of header..
615          */
616
617         if (cmit_fmt_is_mail(opt->commit_format)) {
618                 log_write_email_headers(opt, commit, &extra_headers,
619                                         &ctx.need_8bit_cte, 1);
620                 ctx.rev = opt;
621                 ctx.print_email_subject = 1;
622         } else if (opt->commit_format != CMIT_FMT_USERFORMAT) {
623                 fputs(diff_get_color_opt(&opt->diffopt, DIFF_COMMIT), opt->diffopt.file);
624                 if (opt->commit_format != CMIT_FMT_ONELINE)
625                         fputs("commit ", opt->diffopt.file);
626
627                 if (!opt->graph)
628                         put_revision_mark(opt, commit);
629                 fputs(find_unique_abbrev(&commit->object.oid,
630                                          abbrev_commit),
631                       opt->diffopt.file);
632                 if (opt->print_parents)
633                         show_parents(commit, abbrev_commit, opt->diffopt.file);
634                 if (opt->children.name)
635                         show_children(opt, commit, abbrev_commit);
636                 if (parent)
637                         fprintf(opt->diffopt.file, " (from %s)",
638                                find_unique_abbrev(&parent->object.oid, abbrev_commit));
639                 fputs(diff_get_color_opt(&opt->diffopt, DIFF_RESET), opt->diffopt.file);
640                 show_decorations(opt, commit);
641                 if (opt->commit_format == CMIT_FMT_ONELINE) {
642                         putc(' ', opt->diffopt.file);
643                 } else {
644                         putc('\n', opt->diffopt.file);
645                         graph_show_oneline(opt->graph);
646                 }
647                 if (opt->reflog_info) {
648                         /*
649                          * setup_revisions() ensures that opt->reflog_info
650                          * and opt->graph cannot both be set,
651                          * so we don't need to worry about printing the
652                          * graph info here.
653                          */
654                         show_reflog_message(opt->reflog_info,
655                                             opt->commit_format == CMIT_FMT_ONELINE,
656                                             &opt->date_mode,
657                                             opt->date_mode_explicit);
658                         if (opt->commit_format == CMIT_FMT_ONELINE)
659                                 return;
660                 }
661         }
662
663         if (opt->show_signature) {
664                 show_signature(opt, commit);
665                 show_mergetag(opt, commit);
666         }
667
668         if (opt->show_notes) {
669                 int raw;
670                 struct strbuf notebuf = STRBUF_INIT;
671
672                 raw = (opt->commit_format == CMIT_FMT_USERFORMAT);
673                 format_display_notes(&commit->object.oid, &notebuf,
674                                      get_log_output_encoding(), raw);
675                 ctx.notes_message = notebuf.len
676                         ? strbuf_detach(&notebuf, NULL)
677                         : xcalloc(1, 1);
678         }
679
680         /*
681          * And then the pretty-printed message itself
682          */
683         if (ctx.need_8bit_cte >= 0 && opt->add_signoff)
684                 ctx.need_8bit_cte =
685                         has_non_ascii(fmt_name(getenv("GIT_COMMITTER_NAME"),
686                                                getenv("GIT_COMMITTER_EMAIL")));
687         ctx.date_mode = opt->date_mode;
688         ctx.date_mode_explicit = opt->date_mode_explicit;
689         ctx.abbrev = opt->diffopt.abbrev;
690         ctx.after_subject = extra_headers;
691         ctx.preserve_subject = opt->preserve_subject;
692         ctx.reflog_info = opt->reflog_info;
693         ctx.fmt = opt->commit_format;
694         ctx.mailmap = opt->mailmap;
695         ctx.color = opt->diffopt.use_color;
696         ctx.expand_tabs_in_log = opt->expand_tabs_in_log;
697         ctx.output_encoding = get_log_output_encoding();
698         if (opt->from_ident.mail_begin && opt->from_ident.name_begin)
699                 ctx.from_ident = &opt->from_ident;
700         if (opt->graph)
701                 ctx.graph_width = graph_width(opt->graph);
702         pretty_print_commit(&ctx, commit, &msgbuf);
703
704         if (opt->add_signoff)
705                 append_signoff(&msgbuf, 0, APPEND_SIGNOFF_DEDUP);
706
707         if ((ctx.fmt != CMIT_FMT_USERFORMAT) &&
708             ctx.notes_message && *ctx.notes_message) {
709                 if (cmit_fmt_is_mail(ctx.fmt)) {
710                         strbuf_addstr(&msgbuf, "---\n");
711                         opt->shown_dashes = 1;
712                 }
713                 strbuf_addstr(&msgbuf, ctx.notes_message);
714         }
715
716         if (opt->show_log_size) {
717                 fprintf(opt->diffopt.file, "log size %i\n", (int)msgbuf.len);
718                 graph_show_oneline(opt->graph);
719         }
720
721         /*
722          * Set opt->missing_newline if msgbuf doesn't
723          * end in a newline (including if it is empty)
724          */
725         if (!msgbuf.len || msgbuf.buf[msgbuf.len - 1] != '\n')
726                 opt->missing_newline = 1;
727         else
728                 opt->missing_newline = 0;
729
730         graph_show_commit_msg(opt->graph, opt->diffopt.file, &msgbuf);
731         if (opt->use_terminator && !commit_format_is_empty(opt->commit_format)) {
732                 if (!opt->missing_newline)
733                         graph_show_padding(opt->graph);
734                 putc(opt->diffopt.line_termination, opt->diffopt.file);
735         }
736
737         strbuf_release(&msgbuf);
738         free(ctx.notes_message);
739 }
740
741 int log_tree_diff_flush(struct rev_info *opt)
742 {
743         opt->shown_dashes = 0;
744         diffcore_std(&opt->diffopt);
745
746         if (diff_queue_is_empty()) {
747                 int saved_fmt = opt->diffopt.output_format;
748                 opt->diffopt.output_format = DIFF_FORMAT_NO_OUTPUT;
749                 diff_flush(&opt->diffopt);
750                 opt->diffopt.output_format = saved_fmt;
751                 return 0;
752         }
753
754         if (opt->loginfo && !opt->no_commit_id) {
755                 show_log(opt);
756                 if ((opt->diffopt.output_format & ~DIFF_FORMAT_NO_OUTPUT) &&
757                     opt->verbose_header &&
758                     opt->commit_format != CMIT_FMT_ONELINE &&
759                     !commit_format_is_empty(opt->commit_format)) {
760                         /*
761                          * When showing a verbose header (i.e. log message),
762                          * and not in --pretty=oneline format, we would want
763                          * an extra newline between the end of log and the
764                          * diff/diffstat output for readability.
765                          */
766                         int pch = DIFF_FORMAT_DIFFSTAT | DIFF_FORMAT_PATCH;
767                         if (opt->diffopt.output_prefix) {
768                                 struct strbuf *msg = NULL;
769                                 msg = opt->diffopt.output_prefix(&opt->diffopt,
770                                         opt->diffopt.output_prefix_data);
771                                 fwrite(msg->buf, msg->len, 1, opt->diffopt.file);
772                         }
773
774                         /*
775                          * We may have shown three-dashes line early
776                          * between notes and the log message, in which
777                          * case we only want a blank line after the
778                          * notes without (an extra) three-dashes line.
779                          * Otherwise, we show the three-dashes line if
780                          * we are showing the patch with diffstat, but
781                          * in that case, there is no extra blank line
782                          * after the three-dashes line.
783                          */
784                         if (!opt->shown_dashes &&
785                             (pch & opt->diffopt.output_format) == pch)
786                                 fprintf(opt->diffopt.file, "---");
787                         putc('\n', opt->diffopt.file);
788                 }
789         }
790         diff_flush(&opt->diffopt);
791         return 1;
792 }
793
794 static int do_diff_combined(struct rev_info *opt, struct commit *commit)
795 {
796         diff_tree_combined_merge(commit, opt->dense_combined_merges, opt);
797         return !opt->loginfo;
798 }
799
800 /*
801  * Show the diff of a commit.
802  *
803  * Return true if we printed any log info messages
804  */
805 static int log_tree_diff(struct rev_info *opt, struct commit *commit, struct log_info *log)
806 {
807         int showed_log;
808         struct commit_list *parents;
809         struct object_id *oid;
810
811         if (!opt->diff && !opt->diffopt.flags.exit_with_status)
812                 return 0;
813
814         parse_commit_or_die(commit);
815         oid = get_commit_tree_oid(commit);
816
817         /* Root commit? */
818         parents = get_saved_parents(opt, commit);
819         if (!parents) {
820                 if (opt->show_root_diff) {
821                         diff_root_tree_oid(oid, "", &opt->diffopt);
822                         log_tree_diff_flush(opt);
823                 }
824                 return !opt->loginfo;
825         }
826
827         /* More than one parent? */
828         if (parents && parents->next) {
829                 if (opt->ignore_merges)
830                         return 0;
831                 else if (opt->combine_merges)
832                         return do_diff_combined(opt, commit);
833                 else if (opt->first_parent_only) {
834                         /*
835                          * Generate merge log entry only for the first
836                          * parent, showing summary diff of the others
837                          * we merged _in_.
838                          */
839                         parse_commit_or_die(parents->item);
840                         diff_tree_oid(get_commit_tree_oid(parents->item),
841                                       oid, "", &opt->diffopt);
842                         log_tree_diff_flush(opt);
843                         return !opt->loginfo;
844                 }
845
846                 /* If we show individual diffs, show the parent info */
847                 log->parent = parents->item;
848         }
849
850         showed_log = 0;
851         for (;;) {
852                 struct commit *parent = parents->item;
853
854                 parse_commit_or_die(parent);
855                 diff_tree_oid(get_commit_tree_oid(parent),
856                               oid, "", &opt->diffopt);
857                 log_tree_diff_flush(opt);
858
859                 showed_log |= !opt->loginfo;
860
861                 /* Set up the log info for the next parent, if any.. */
862                 parents = parents->next;
863                 if (!parents)
864                         break;
865                 log->parent = parents->item;
866                 opt->loginfo = log;
867         }
868         return showed_log;
869 }
870
871 int log_tree_commit(struct rev_info *opt, struct commit *commit)
872 {
873         struct log_info log;
874         int shown, close_file = opt->diffopt.close_file;
875
876         log.commit = commit;
877         log.parent = NULL;
878         opt->loginfo = &log;
879         opt->diffopt.close_file = 0;
880
881         if (opt->line_level_traverse)
882                 return line_log_print(opt, commit);
883
884         if (opt->track_linear && !opt->linear && !opt->reverse_output_stage)
885                 fprintf(opt->diffopt.file, "\n%s\n", opt->break_bar);
886         shown = log_tree_diff(opt, commit, &log);
887         if (!shown && opt->loginfo && opt->always_show_header) {
888                 log.parent = NULL;
889                 show_log(opt);
890                 shown = 1;
891         }
892         if (opt->track_linear && !opt->linear && opt->reverse_output_stage)
893                 fprintf(opt->diffopt.file, "\n%s\n", opt->break_bar);
894         opt->loginfo = NULL;
895         maybe_flush_or_die(opt->diffopt.file, "stdout");
896         if (close_file)
897                 fclose(opt->diffopt.file);
898         return shown;
899 }