git-merge: no reason to use cpio anymore
[git] / log-tree.c
1 #include "cache.h"
2 #include "diff.h"
3 #include "commit.h"
4 #include "log-tree.h"
5 #include "reflog-walk.h"
6
7 struct decoration name_decoration = { "object names" };
8
9 static void show_parents(struct commit *commit, int abbrev)
10 {
11         struct commit_list *p;
12         for (p = commit->parents; p ; p = p->next) {
13                 struct commit *parent = p->item;
14                 printf(" %s", diff_unique_abbrev(parent->object.sha1, abbrev));
15         }
16 }
17
18 static void show_decorations(struct commit *commit)
19 {
20         const char *prefix;
21         struct name_decoration *decoration;
22
23         decoration = lookup_decoration(&name_decoration, &commit->object);
24         if (!decoration)
25                 return;
26         prefix = " (";
27         while (decoration) {
28                 printf("%s%s", prefix, decoration->name);
29                 prefix = ", ";
30                 decoration = decoration->next;
31         }
32         putchar(')');
33 }
34
35 /*
36  * Search for "^[-A-Za-z]+: [^@]+@" pattern. It usually matches
37  * Signed-off-by: and Acked-by: lines.
38  */
39 static int detect_any_signoff(char *letter, int size)
40 {
41         char ch, *cp;
42         int seen_colon = 0;
43         int seen_at = 0;
44         int seen_name = 0;
45         int seen_head = 0;
46
47         cp = letter + size;
48         while (letter <= --cp && (ch = *cp) == '\n')
49                 continue;
50
51         while (letter <= cp) {
52                 ch = *cp--;
53                 if (ch == '\n')
54                         break;
55
56                 if (!seen_at) {
57                         if (ch == '@')
58                                 seen_at = 1;
59                         continue;
60                 }
61                 if (!seen_colon) {
62                         if (ch == '@')
63                                 return 0;
64                         else if (ch == ':')
65                                 seen_colon = 1;
66                         else
67                                 seen_name = 1;
68                         continue;
69                 }
70                 if (('A' <= ch && ch <= 'Z') ||
71                     ('a' <= ch && ch <= 'z') ||
72                     ch == '-') {
73                         seen_head = 1;
74                         continue;
75                 }
76                 /* no empty last line doesn't match */
77                 return 0;
78         }
79         return seen_head && seen_name;
80 }
81
82 static unsigned long append_signoff(char **buf_p, unsigned long *buf_sz_p,
83                                     unsigned long at, 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         char *buf;
90         unsigned long buf_sz;
91
92         buf = *buf_p;
93         buf_sz = *buf_sz_p;
94         if (buf_sz <= at + strlen(signed_off_by) + signoff_len + 3) {
95                 buf_sz += strlen(signed_off_by) + signoff_len + 3;
96                 buf = xrealloc(buf, buf_sz);
97                 *buf_p = buf;
98                 *buf_sz_p = buf_sz;
99         }
100         cp = buf;
101
102         /* First see if we already have the sign-off by the signer */
103         while ((cp = strstr(cp, signed_off_by))) {
104
105                 has_signoff = 1;
106
107                 cp += strlen(signed_off_by);
108                 if (cp + signoff_len >= buf + at)
109                         break;
110                 if (strncmp(cp, signoff, signoff_len))
111                         continue;
112                 if (!isspace(cp[signoff_len]))
113                         continue;
114                 /* we already have him */
115                 return at;
116         }
117
118         if (!has_signoff)
119                 has_signoff = detect_any_signoff(buf, at);
120
121         if (!has_signoff)
122                 buf[at++] = '\n';
123
124         strcpy(buf + at, signed_off_by);
125         at += strlen(signed_off_by);
126         strcpy(buf + at, signoff);
127         at += signoff_len;
128         buf[at++] = '\n';
129         buf[at] = 0;
130         return at;
131 }
132
133 static unsigned int digits_in_number(unsigned int number)
134 {
135         unsigned int i = 10, result = 1;
136         while (i <= number) {
137                 i *= 10;
138                 result++;
139         }
140         return result;
141 }
142
143 void show_log(struct rev_info *opt, const char *sep)
144 {
145         char *msgbuf = NULL;
146         unsigned long msgbuf_len = 0;
147         struct log_info *log = opt->loginfo;
148         struct commit *commit = log->commit, *parent = log->parent;
149         int abbrev = opt->diffopt.abbrev;
150         int abbrev_commit = opt->abbrev_commit ? opt->abbrev : 40;
151         const char *extra;
152         int len;
153         const char *subject = NULL, *extra_headers = opt->extra_headers;
154
155         opt->loginfo = NULL;
156         if (!opt->verbose_header) {
157                 if (opt->left_right) {
158                         if (commit->object.flags & BOUNDARY)
159                                 putchar('-');
160                         else if (commit->object.flags & SYMMETRIC_LEFT)
161                                 putchar('<');
162                         else
163                                 putchar('>');
164                 }
165                 fputs(diff_unique_abbrev(commit->object.sha1, abbrev_commit), stdout);
166                 if (opt->parents)
167                         show_parents(commit, abbrev_commit);
168                 show_decorations(commit);
169                 putchar(opt->diffopt.line_termination);
170                 return;
171         }
172
173         /*
174          * The "oneline" format has several special cases:
175          *  - The pretty-printed commit lacks a newline at the end
176          *    of the buffer, but we do want to make sure that we
177          *    have a newline there. If the separator isn't already
178          *    a newline, add an extra one.
179          *  - unlike other log messages, the one-line format does
180          *    not have an empty line between entries.
181          */
182         extra = "";
183         if (*sep != '\n' && opt->commit_format == CMIT_FMT_ONELINE)
184                 extra = "\n";
185         if (opt->shown_one && opt->commit_format != CMIT_FMT_ONELINE)
186                 putchar(opt->diffopt.line_termination);
187         opt->shown_one = 1;
188
189         /*
190          * Print header line of header..
191          */
192
193         if (opt->commit_format == CMIT_FMT_EMAIL) {
194                 char *sha1 = sha1_to_hex(commit->object.sha1);
195                 if (opt->total > 0) {
196                         static char buffer[64];
197                         snprintf(buffer, sizeof(buffer),
198                                         "Subject: [%s %0*d/%d] ",
199                                         opt->subject_prefix,
200                                         digits_in_number(opt->total),
201                                         opt->nr, opt->total);
202                         subject = buffer;
203                 } else if (opt->total == 0 && opt->subject_prefix && *opt->subject_prefix) {
204                         static char buffer[256];
205                         snprintf(buffer, sizeof(buffer),
206                                         "Subject: [%s] ",
207                                         opt->subject_prefix);
208                         subject = buffer;
209                 } else {
210                         subject = "Subject: ";
211                 }
212
213                 printf("From %s Mon Sep 17 00:00:00 2001\n", sha1);
214                 if (opt->message_id)
215                         printf("Message-Id: <%s>\n", opt->message_id);
216                 if (opt->ref_message_id)
217                         printf("In-Reply-To: <%s>\nReferences: <%s>\n",
218                                opt->ref_message_id, opt->ref_message_id);
219                 if (opt->mime_boundary) {
220                         static char subject_buffer[1024];
221                         static char buffer[1024];
222                         snprintf(subject_buffer, sizeof(subject_buffer) - 1,
223                                  "%s"
224                                  "MIME-Version: 1.0\n"
225                                  "Content-Type: multipart/mixed;"
226                                  " boundary=\"%s%s\"\n"
227                                  "\n"
228                                  "This is a multi-part message in MIME "
229                                  "format.\n"
230                                  "--%s%s\n"
231                                  "Content-Type: text/plain; "
232                                  "charset=UTF-8; format=fixed\n"
233                                  "Content-Transfer-Encoding: 8bit\n\n",
234                                  extra_headers ? extra_headers : "",
235                                  mime_boundary_leader, opt->mime_boundary,
236                                  mime_boundary_leader, opt->mime_boundary);
237                         extra_headers = subject_buffer;
238
239                         snprintf(buffer, sizeof(buffer) - 1,
240                                  "--%s%s\n"
241                                  "Content-Type: text/x-patch;"
242                                  " name=\"%s.diff\"\n"
243                                  "Content-Transfer-Encoding: 8bit\n"
244                                  "Content-Disposition: %s;"
245                                  " filename=\"%s.diff\"\n\n",
246                                  mime_boundary_leader, opt->mime_boundary,
247                                  sha1,
248                                  opt->no_inline ? "attachment" : "inline",
249                                  sha1);
250                         opt->diffopt.stat_sep = buffer;
251                 }
252         } else if (opt->commit_format != CMIT_FMT_USERFORMAT) {
253                 fputs(diff_get_color(opt->diffopt.color_diff, DIFF_COMMIT),
254                       stdout);
255                 if (opt->commit_format != CMIT_FMT_ONELINE)
256                         fputs("commit ", stdout);
257                 if (commit->object.flags & BOUNDARY)
258                         putchar('-');
259                 else if (opt->left_right) {
260                         if (commit->object.flags & SYMMETRIC_LEFT)
261                                 putchar('<');
262                         else
263                                 putchar('>');
264                 }
265                 fputs(diff_unique_abbrev(commit->object.sha1, abbrev_commit),
266                       stdout);
267                 if (opt->parents)
268                         show_parents(commit, abbrev_commit);
269                 if (parent)
270                         printf(" (from %s)",
271                                diff_unique_abbrev(parent->object.sha1,
272                                                   abbrev_commit));
273                 show_decorations(commit);
274                 printf("%s",
275                        diff_get_color(opt->diffopt.color_diff, DIFF_RESET));
276                 putchar(opt->commit_format == CMIT_FMT_ONELINE ? ' ' : '\n');
277                 if (opt->reflog_info) {
278                         show_reflog_message(opt->reflog_info,
279                                     opt->commit_format == CMIT_FMT_ONELINE,
280                                     opt->date_mode);
281                         if (opt->commit_format == CMIT_FMT_ONELINE) {
282                                 printf("%s", sep);
283                                 return;
284                         }
285                 }
286         }
287
288         /*
289          * And then the pretty-printed message itself
290          */
291         len = pretty_print_commit(opt->commit_format, commit, ~0u,
292                                   &msgbuf, &msgbuf_len, abbrev, subject,
293                                   extra_headers, opt->date_mode);
294
295         if (opt->add_signoff)
296                 len = append_signoff(&msgbuf, &msgbuf_len, len,
297                                      opt->add_signoff);
298         if (opt->show_log_size)
299                 printf("log size %i\n", len);
300
301         printf("%s%s%s", msgbuf, extra, sep);
302         free(msgbuf);
303 }
304
305 int log_tree_diff_flush(struct rev_info *opt)
306 {
307         diffcore_std(&opt->diffopt);
308
309         if (diff_queue_is_empty()) {
310                 int saved_fmt = opt->diffopt.output_format;
311                 opt->diffopt.output_format = DIFF_FORMAT_NO_OUTPUT;
312                 diff_flush(&opt->diffopt);
313                 opt->diffopt.output_format = saved_fmt;
314                 return 0;
315         }
316
317         if (opt->loginfo && !opt->no_commit_id) {
318                 /* When showing a verbose header (i.e. log message),
319                  * and not in --pretty=oneline format, we would want
320                  * an extra newline between the end of log and the
321                  * output for readability.
322                  */
323                 show_log(opt, opt->diffopt.msg_sep);
324                 if (opt->verbose_header &&
325                     opt->commit_format != CMIT_FMT_ONELINE) {
326                         int pch = DIFF_FORMAT_DIFFSTAT | DIFF_FORMAT_PATCH;
327                         if ((pch & opt->diffopt.output_format) == pch)
328                                 printf("---");
329                         putchar('\n');
330                 }
331         }
332         diff_flush(&opt->diffopt);
333         return 1;
334 }
335
336 static int do_diff_combined(struct rev_info *opt, struct commit *commit)
337 {
338         unsigned const char *sha1 = commit->object.sha1;
339
340         diff_tree_combined_merge(sha1, opt->dense_combined_merges, opt);
341         return !opt->loginfo;
342 }
343
344 /*
345  * Show the diff of a commit.
346  *
347  * Return true if we printed any log info messages
348  */
349 static int log_tree_diff(struct rev_info *opt, struct commit *commit, struct log_info *log)
350 {
351         int showed_log;
352         struct commit_list *parents;
353         unsigned const char *sha1 = commit->object.sha1;
354
355         if (!opt->diff)
356                 return 0;
357
358         /* Root commit? */
359         parents = commit->parents;
360         if (!parents) {
361                 if (opt->show_root_diff) {
362                         diff_root_tree_sha1(sha1, "", &opt->diffopt);
363                         log_tree_diff_flush(opt);
364                 }
365                 return !opt->loginfo;
366         }
367
368         /* More than one parent? */
369         if (parents && parents->next) {
370                 if (opt->ignore_merges)
371                         return 0;
372                 else if (opt->combine_merges)
373                         return do_diff_combined(opt, commit);
374
375                 /* If we show individual diffs, show the parent info */
376                 log->parent = parents->item;
377         }
378
379         showed_log = 0;
380         for (;;) {
381                 struct commit *parent = parents->item;
382
383                 diff_tree_sha1(parent->object.sha1, sha1, "", &opt->diffopt);
384                 log_tree_diff_flush(opt);
385
386                 showed_log |= !opt->loginfo;
387
388                 /* Set up the log info for the next parent, if any.. */
389                 parents = parents->next;
390                 if (!parents)
391                         break;
392                 log->parent = parents->item;
393                 opt->loginfo = log;
394         }
395         return showed_log;
396 }
397
398 int log_tree_commit(struct rev_info *opt, struct commit *commit)
399 {
400         struct log_info log;
401         int shown;
402
403         log.commit = commit;
404         log.parent = NULL;
405         opt->loginfo = &log;
406
407         shown = log_tree_diff(opt, commit, &log);
408         if (!shown && opt->loginfo && opt->always_show_header) {
409                 log.parent = NULL;
410                 show_log(opt, "");
411                 shown = 1;
412         }
413         opt->loginfo = NULL;
414         maybe_flush_or_die(stdout, "stdout");
415         return shown;
416 }