git-submodule - Add 'foreach' subcommand
[git] / log-tree.c
1 #include "cache.h"
2 #include "diff.h"
3 #include "commit.h"
4 #include "graph.h"
5 #include "log-tree.h"
6 #include "reflog-walk.h"
7
8 struct decoration name_decoration = { "object names" };
9
10 static void show_parents(struct commit *commit, int abbrev)
11 {
12         struct commit_list *p;
13         for (p = commit->parents; p ; p = p->next) {
14                 struct commit *parent = p->item;
15                 printf(" %s", diff_unique_abbrev(parent->object.sha1, abbrev));
16         }
17 }
18
19 void show_decorations(struct commit *commit)
20 {
21         const char *prefix;
22         struct name_decoration *decoration;
23
24         decoration = lookup_decoration(&name_decoration, &commit->object);
25         if (!decoration)
26                 return;
27         prefix = " (";
28         while (decoration) {
29                 printf("%s%s", prefix, decoration->name);
30                 prefix = ", ";
31                 decoration = decoration->next;
32         }
33         putchar(')');
34 }
35
36 /*
37  * Search for "^[-A-Za-z]+: [^@]+@" pattern. It usually matches
38  * Signed-off-by: and Acked-by: lines.
39  */
40 static int detect_any_signoff(char *letter, int size)
41 {
42         char ch, *cp;
43         int seen_colon = 0;
44         int seen_at = 0;
45         int seen_name = 0;
46         int seen_head = 0;
47
48         cp = letter + size;
49         while (letter <= --cp && (ch = *cp) == '\n')
50                 continue;
51
52         while (letter <= cp) {
53                 ch = *cp--;
54                 if (ch == '\n')
55                         break;
56
57                 if (!seen_at) {
58                         if (ch == '@')
59                                 seen_at = 1;
60                         continue;
61                 }
62                 if (!seen_colon) {
63                         if (ch == '@')
64                                 return 0;
65                         else if (ch == ':')
66                                 seen_colon = 1;
67                         else
68                                 seen_name = 1;
69                         continue;
70                 }
71                 if (('A' <= ch && ch <= 'Z') ||
72                     ('a' <= ch && ch <= 'z') ||
73                     ch == '-') {
74                         seen_head = 1;
75                         continue;
76                 }
77                 /* no empty last line doesn't match */
78                 return 0;
79         }
80         return seen_head && seen_name;
81 }
82
83 static void append_signoff(struct strbuf *sb, const char *signoff)
84 {
85         static const char signed_off_by[] = "Signed-off-by: ";
86         size_t signoff_len = strlen(signoff);
87         int has_signoff = 0;
88         char *cp;
89
90         cp = sb->buf;
91
92         /* First see if we already have the sign-off by the signer */
93         while ((cp = strstr(cp, signed_off_by))) {
94
95                 has_signoff = 1;
96
97                 cp += strlen(signed_off_by);
98                 if (cp + signoff_len >= sb->buf + sb->len)
99                         break;
100                 if (strncmp(cp, signoff, signoff_len))
101                         continue;
102                 if (!isspace(cp[signoff_len]))
103                         continue;
104                 /* we already have him */
105                 return;
106         }
107
108         if (!has_signoff)
109                 has_signoff = detect_any_signoff(sb->buf, sb->len);
110
111         if (!has_signoff)
112                 strbuf_addch(sb, '\n');
113
114         strbuf_addstr(sb, signed_off_by);
115         strbuf_add(sb, signoff, signoff_len);
116         strbuf_addch(sb, '\n');
117 }
118
119 static unsigned int digits_in_number(unsigned int number)
120 {
121         unsigned int i = 10, result = 1;
122         while (i <= number) {
123                 i *= 10;
124                 result++;
125         }
126         return result;
127 }
128
129 static int has_non_ascii(const char *s)
130 {
131         int ch;
132         if (!s)
133                 return 0;
134         while ((ch = *s++) != '\0') {
135                 if (non_ascii(ch))
136                         return 1;
137         }
138         return 0;
139 }
140
141 void log_write_email_headers(struct rev_info *opt, const char *name,
142                              const char **subject_p,
143                              const char **extra_headers_p,
144                              int *need_8bit_cte_p)
145 {
146         const char *subject = NULL;
147         const char *extra_headers = opt->extra_headers;
148
149         *need_8bit_cte_p = 0; /* unknown */
150         if (opt->total > 0) {
151                 static char buffer[64];
152                 snprintf(buffer, sizeof(buffer),
153                          "Subject: [%s %0*d/%d] ",
154                          opt->subject_prefix,
155                          digits_in_number(opt->total),
156                          opt->nr, opt->total);
157                 subject = buffer;
158         } else if (opt->total == 0 && opt->subject_prefix && *opt->subject_prefix) {
159                 static char buffer[256];
160                 snprintf(buffer, sizeof(buffer),
161                          "Subject: [%s] ",
162                          opt->subject_prefix);
163                 subject = buffer;
164         } else {
165                 subject = "Subject: ";
166         }
167
168         printf("From %s Mon Sep 17 00:00:00 2001\n", name);
169         graph_show_oneline(opt->graph);
170         if (opt->message_id) {
171                 printf("Message-Id: <%s>\n", opt->message_id);
172                 graph_show_oneline(opt->graph);
173         }
174         if (opt->ref_message_id) {
175                 printf("In-Reply-To: <%s>\nReferences: <%s>\n",
176                        opt->ref_message_id, opt->ref_message_id);
177                 graph_show_oneline(opt->graph);
178         }
179         if (opt->mime_boundary) {
180                 static char subject_buffer[1024];
181                 static char buffer[1024];
182                 *need_8bit_cte_p = -1; /* NEVER */
183                 snprintf(subject_buffer, sizeof(subject_buffer) - 1,
184                          "%s"
185                          "MIME-Version: 1.0\n"
186                          "Content-Type: multipart/mixed;"
187                          " boundary=\"%s%s\"\n"
188                          "\n"
189                          "This is a multi-part message in MIME "
190                          "format.\n"
191                          "--%s%s\n"
192                          "Content-Type: text/plain; "
193                          "charset=UTF-8; format=fixed\n"
194                          "Content-Transfer-Encoding: 8bit\n\n",
195                          extra_headers ? extra_headers : "",
196                          mime_boundary_leader, opt->mime_boundary,
197                          mime_boundary_leader, opt->mime_boundary);
198                 extra_headers = subject_buffer;
199
200                 snprintf(buffer, sizeof(buffer) - 1,
201                          "\n--%s%s\n"
202                          "Content-Type: text/x-patch;"
203                          " name=\"%s.diff\"\n"
204                          "Content-Transfer-Encoding: 8bit\n"
205                          "Content-Disposition: %s;"
206                          " filename=\"%s.diff\"\n\n",
207                          mime_boundary_leader, opt->mime_boundary,
208                          name,
209                          opt->no_inline ? "attachment" : "inline",
210                          name);
211                 opt->diffopt.stat_sep = buffer;
212         }
213         *subject_p = subject;
214         *extra_headers_p = extra_headers;
215 }
216
217 void show_log(struct rev_info *opt)
218 {
219         struct strbuf msgbuf;
220         struct log_info *log = opt->loginfo;
221         struct commit *commit = log->commit, *parent = log->parent;
222         int abbrev = opt->diffopt.abbrev;
223         int abbrev_commit = opt->abbrev_commit ? opt->abbrev : 40;
224         const char *subject = NULL, *extra_headers = opt->extra_headers;
225         int need_8bit_cte = 0;
226
227         opt->loginfo = NULL;
228         if (!opt->verbose_header) {
229                 graph_show_commit(opt->graph);
230
231                 if (!opt->graph) {
232                         if (commit->object.flags & BOUNDARY)
233                                 putchar('-');
234                         else if (commit->object.flags & UNINTERESTING)
235                                 putchar('^');
236                         else if (opt->left_right) {
237                                 if (commit->object.flags & SYMMETRIC_LEFT)
238                                         putchar('<');
239                                 else
240                                         putchar('>');
241                         }
242                 }
243                 fputs(diff_unique_abbrev(commit->object.sha1, abbrev_commit), stdout);
244                 if (opt->print_parents)
245                         show_parents(commit, abbrev_commit);
246                 show_decorations(commit);
247                 if (opt->graph && !graph_is_commit_finished(opt->graph)) {
248                         putchar('\n');
249                         graph_show_remainder(opt->graph);
250                 }
251                 putchar(opt->diffopt.line_termination);
252                 return;
253         }
254
255         /*
256          * If use_terminator is set, add a newline at the end of the entry.
257          * Otherwise, add a diffopt.line_termination character before all
258          * entries but the first.  (IOW, as a separator between entries)
259          */
260         if (opt->shown_one && !opt->use_terminator) {
261                 /*
262                  * If entries are separated by a newline, the output
263                  * should look human-readable.  If the last entry ended
264                  * with a newline, print the graph output before this
265                  * newline.  Otherwise it will end up as a completely blank
266                  * line and will look like a gap in the graph.
267                  *
268                  * If the entry separator is not a newline, the output is
269                  * primarily intended for programmatic consumption, and we
270                  * never want the extra graph output before the entry
271                  * separator.
272                  */
273                 if (opt->diffopt.line_termination == '\n' &&
274                     !opt->missing_newline)
275                         graph_show_padding(opt->graph);
276                 putchar(opt->diffopt.line_termination);
277         }
278         opt->shown_one = 1;
279
280         /*
281          * If the history graph was requested,
282          * print the graph, up to this commit's line
283          */
284         graph_show_commit(opt->graph);
285
286         /*
287          * Print header line of header..
288          */
289
290         if (opt->commit_format == CMIT_FMT_EMAIL) {
291                 log_write_email_headers(opt, sha1_to_hex(commit->object.sha1),
292                                         &subject, &extra_headers,
293                                         &need_8bit_cte);
294         } else if (opt->commit_format != CMIT_FMT_USERFORMAT) {
295                 fputs(diff_get_color_opt(&opt->diffopt, DIFF_COMMIT), stdout);
296                 if (opt->commit_format != CMIT_FMT_ONELINE)
297                         fputs("commit ", stdout);
298
299                 if (!opt->graph) {
300                         if (commit->object.flags & BOUNDARY)
301                                 putchar('-');
302                         else if (commit->object.flags & UNINTERESTING)
303                                 putchar('^');
304                         else if (opt->left_right) {
305                                 if (commit->object.flags & SYMMETRIC_LEFT)
306                                         putchar('<');
307                                 else
308                                         putchar('>');
309                         }
310                 }
311                 fputs(diff_unique_abbrev(commit->object.sha1, abbrev_commit),
312                       stdout);
313                 if (opt->print_parents)
314                         show_parents(commit, abbrev_commit);
315                 if (parent)
316                         printf(" (from %s)",
317                                diff_unique_abbrev(parent->object.sha1,
318                                                   abbrev_commit));
319                 show_decorations(commit);
320                 printf("%s", diff_get_color_opt(&opt->diffopt, DIFF_RESET));
321                 if (opt->commit_format == CMIT_FMT_ONELINE) {
322                         putchar(' ');
323                 } else {
324                         putchar('\n');
325                         graph_show_oneline(opt->graph);
326                 }
327                 if (opt->reflog_info) {
328                         /*
329                          * setup_revisions() ensures that opt->reflog_info
330                          * and opt->graph cannot both be set,
331                          * so we don't need to worry about printing the
332                          * graph info here.
333                          */
334                         show_reflog_message(opt->reflog_info,
335                                     opt->commit_format == CMIT_FMT_ONELINE,
336                                     opt->date_mode);
337                         if (opt->commit_format == CMIT_FMT_ONELINE)
338                                 return;
339                 }
340         }
341
342         if (!commit->buffer)
343                 return;
344
345         /*
346          * And then the pretty-printed message itself
347          */
348         strbuf_init(&msgbuf, 0);
349         if (need_8bit_cte >= 0)
350                 need_8bit_cte = has_non_ascii(opt->add_signoff);
351         pretty_print_commit(opt->commit_format, commit, &msgbuf,
352                             abbrev, subject, extra_headers, opt->date_mode,
353                             need_8bit_cte);
354
355         if (opt->add_signoff)
356                 append_signoff(&msgbuf, opt->add_signoff);
357         if (opt->show_log_size) {
358                 printf("log size %i\n", (int)msgbuf.len);
359                 graph_show_oneline(opt->graph);
360         }
361
362         /*
363          * Set opt->missing_newline if msgbuf doesn't
364          * end in a newline (including if it is empty)
365          */
366         if (!msgbuf.len || msgbuf.buf[msgbuf.len - 1] != '\n')
367                 opt->missing_newline = 1;
368         else
369                 opt->missing_newline = 0;
370
371         if (opt->graph)
372                 graph_show_commit_msg(opt->graph, &msgbuf);
373         else
374                 fwrite(msgbuf.buf, sizeof(char), msgbuf.len, stdout);
375         if (opt->use_terminator) {
376                 if (!opt->missing_newline)
377                         graph_show_padding(opt->graph);
378                 putchar('\n');
379         }
380
381         strbuf_release(&msgbuf);
382 }
383
384 int log_tree_diff_flush(struct rev_info *opt)
385 {
386         diffcore_std(&opt->diffopt);
387
388         if (diff_queue_is_empty()) {
389                 int saved_fmt = opt->diffopt.output_format;
390                 opt->diffopt.output_format = DIFF_FORMAT_NO_OUTPUT;
391                 diff_flush(&opt->diffopt);
392                 opt->diffopt.output_format = saved_fmt;
393                 return 0;
394         }
395
396         if (opt->loginfo && !opt->no_commit_id) {
397                 /* When showing a verbose header (i.e. log message),
398                  * and not in --pretty=oneline format, we would want
399                  * an extra newline between the end of log and the
400                  * output for readability.
401                  */
402                 show_log(opt);
403                 if ((opt->diffopt.output_format & ~DIFF_FORMAT_NO_OUTPUT) &&
404                     opt->verbose_header &&
405                     opt->commit_format != CMIT_FMT_ONELINE) {
406                         int pch = DIFF_FORMAT_DIFFSTAT | DIFF_FORMAT_PATCH;
407                         if ((pch & opt->diffopt.output_format) == pch)
408                                 printf("---");
409                         putchar('\n');
410                 }
411         }
412         diff_flush(&opt->diffopt);
413         return 1;
414 }
415
416 static int do_diff_combined(struct rev_info *opt, struct commit *commit)
417 {
418         unsigned const char *sha1 = commit->object.sha1;
419
420         diff_tree_combined_merge(sha1, opt->dense_combined_merges, opt);
421         return !opt->loginfo;
422 }
423
424 /*
425  * Show the diff of a commit.
426  *
427  * Return true if we printed any log info messages
428  */
429 static int log_tree_diff(struct rev_info *opt, struct commit *commit, struct log_info *log)
430 {
431         int showed_log;
432         struct commit_list *parents;
433         unsigned const char *sha1 = commit->object.sha1;
434
435         if (!opt->diff)
436                 return 0;
437
438         /* Root commit? */
439         parents = commit->parents;
440         if (!parents) {
441                 if (opt->show_root_diff) {
442                         diff_root_tree_sha1(sha1, "", &opt->diffopt);
443                         log_tree_diff_flush(opt);
444                 }
445                 return !opt->loginfo;
446         }
447
448         /* More than one parent? */
449         if (parents && parents->next) {
450                 if (opt->ignore_merges)
451                         return 0;
452                 else if (opt->combine_merges)
453                         return do_diff_combined(opt, commit);
454
455                 /* If we show individual diffs, show the parent info */
456                 log->parent = parents->item;
457         }
458
459         showed_log = 0;
460         for (;;) {
461                 struct commit *parent = parents->item;
462
463                 diff_tree_sha1(parent->object.sha1, sha1, "", &opt->diffopt);
464                 log_tree_diff_flush(opt);
465
466                 showed_log |= !opt->loginfo;
467
468                 /* Set up the log info for the next parent, if any.. */
469                 parents = parents->next;
470                 if (!parents)
471                         break;
472                 log->parent = parents->item;
473                 opt->loginfo = log;
474         }
475         return showed_log;
476 }
477
478 int log_tree_commit(struct rev_info *opt, struct commit *commit)
479 {
480         struct log_info log;
481         int shown;
482
483         log.commit = commit;
484         log.parent = NULL;
485         opt->loginfo = &log;
486
487         shown = log_tree_diff(opt, commit, &log);
488         if (!shown && opt->loginfo && opt->always_show_header) {
489                 log.parent = NULL;
490                 show_log(opt);
491                 shown = 1;
492         }
493         opt->loginfo = NULL;
494         maybe_flush_or_die(stdout, "stdout");
495         return shown;
496 }