Make index file locking code reusable to others.
[git.git] / log-tree.c
1 #include "cache.h"
2 #include "diff.h"
3 #include "commit.h"
4 #include "log-tree.h"
5
6 static void show_parents(struct commit *commit, int abbrev)
7 {
8         struct commit_list *p;
9         for (p = commit->parents; p ; p = p->next) {
10                 struct commit *parent = p->item;
11                 printf(" %s", diff_unique_abbrev(parent->object.sha1, abbrev));
12         }
13 }
14
15 static int append_signoff(char *buf, int buf_sz, int at, const char *signoff)
16 {
17         int signoff_len = strlen(signoff);
18         static const char signed_off_by[] = "Signed-off-by: ";
19         char *cp = buf;
20
21         /* Do we have enough space to add it? */
22         if (buf_sz - at <= strlen(signed_off_by) + signoff_len + 2)
23                 return at;
24
25         /* First see if we already have the sign-off by the signer */
26         while (1) {
27                 cp = strstr(cp, signed_off_by);
28                 if (!cp)
29                         break;
30                 cp += strlen(signed_off_by);
31                 if ((cp + signoff_len < buf + at) &&
32                     !strncmp(cp, signoff, signoff_len) &&
33                     isspace(cp[signoff_len]))
34                         return at; /* we already have him */
35         }
36
37         strcpy(buf + at, signed_off_by);
38         at += strlen(signed_off_by);
39         strcpy(buf + at, signoff);
40         at += signoff_len;
41         buf[at++] = '\n';
42         buf[at] = 0;
43         return at;
44 }
45
46 void show_log(struct rev_info *opt, struct log_info *log, const char *sep)
47 {
48         static char this_header[16384];
49         struct commit *commit = log->commit, *parent = log->parent;
50         int abbrev = opt->diffopt.abbrev;
51         int abbrev_commit = opt->abbrev_commit ? opt->abbrev : 40;
52         const char *extra;
53         int len;
54         const char *subject = NULL, *extra_headers = opt->extra_headers;
55
56         opt->loginfo = NULL;
57         if (!opt->verbose_header) {
58                 fputs(diff_unique_abbrev(commit->object.sha1, abbrev_commit), stdout);
59                 if (opt->parents)
60                         show_parents(commit, abbrev_commit);
61                 putchar('\n');
62                 return;
63         }
64
65         /*
66          * The "oneline" format has several special cases:
67          *  - The pretty-printed commit lacks a newline at the end
68          *    of the buffer, but we do want to make sure that we
69          *    have a newline there. If the separator isn't already
70          *    a newline, add an extra one.
71          *  - unlike other log messages, the one-line format does
72          *    not have an empty line between entries.
73          */
74         extra = "";
75         if (*sep != '\n' && opt->commit_format == CMIT_FMT_ONELINE)
76                 extra = "\n";
77         if (opt->shown_one && opt->commit_format != CMIT_FMT_ONELINE)
78                 putchar('\n');
79         opt->shown_one = 1;
80
81         /*
82          * Print header line of header..
83          */
84
85         if (opt->commit_format == CMIT_FMT_EMAIL) {
86                 char *sha1 = sha1_to_hex(commit->object.sha1);
87                 if (opt->total > 0) {
88                         static char buffer[64];
89                         snprintf(buffer, sizeof(buffer),
90                                         "Subject: [PATCH %d/%d] ",
91                                         opt->nr, opt->total);
92                         subject = buffer;
93                 } else if (opt->total == 0)
94                         subject = "Subject: [PATCH] ";
95                 else
96                         subject = "Subject: ";
97
98                 printf("From %s Mon Sep 17 00:00:00 2001\n", sha1);
99                 if (opt->mime_boundary) {
100                         static char subject_buffer[1024];
101                         static char buffer[1024];
102                         snprintf(subject_buffer, sizeof(subject_buffer) - 1,
103                                  "%s"
104                                  "MIME-Version: 1.0\n"
105                                  "Content-Type: multipart/mixed;\n"
106                                  " boundary=\"%s%s\"\n"
107                                  "\n"
108                                  "This is a multi-part message in MIME "
109                                  "format.\n"
110                                  "--%s%s\n"
111                                  "Content-Type: text/plain; "
112                                  "charset=UTF-8; format=fixed\n"
113                                  "Content-Transfer-Encoding: 8bit\n\n",
114                                  extra_headers ? extra_headers : "",
115                                  mime_boundary_leader, opt->mime_boundary,
116                                  mime_boundary_leader, opt->mime_boundary);
117                         extra_headers = subject_buffer;
118
119                         snprintf(buffer, sizeof(buffer) - 1,
120                                  "--%s%s\n"
121                                  "Content-Type: text/x-patch;\n"
122                                  " name=\"%s.diff\"\n"
123                                  "Content-Transfer-Encoding: 8bit\n"
124                                  "Content-Disposition: inline;\n"
125                                  " filename=\"%s.diff\"\n\n",
126                                  mime_boundary_leader, opt->mime_boundary,
127                                  sha1, sha1);
128                         opt->diffopt.stat_sep = buffer;
129                 }
130         } else {
131                 printf("%s%s",
132                        opt->commit_format == CMIT_FMT_ONELINE ? "" : "commit ",
133                        diff_unique_abbrev(commit->object.sha1, abbrev_commit));
134                 if (opt->parents)
135                         show_parents(commit, abbrev_commit);
136                 if (parent)
137                         printf(" (from %s)",
138                                diff_unique_abbrev(parent->object.sha1,
139                                                   abbrev_commit));
140                 putchar(opt->commit_format == CMIT_FMT_ONELINE ? ' ' : '\n');
141         }
142
143         /*
144          * And then the pretty-printed message itself
145          */
146         len = pretty_print_commit(opt->commit_format, commit, ~0u, this_header, sizeof(this_header), abbrev, subject, extra_headers);
147
148         if (opt->add_signoff)
149                 len = append_signoff(this_header, sizeof(this_header), len,
150                                      opt->add_signoff);
151         printf("%s%s%s", this_header, extra, sep);
152 }
153
154 int log_tree_diff_flush(struct rev_info *opt)
155 {
156         diffcore_std(&opt->diffopt);
157
158         if (diff_queue_is_empty()) {
159                 int saved_fmt = opt->diffopt.output_format;
160                 opt->diffopt.output_format = DIFF_FORMAT_NO_OUTPUT;
161                 diff_flush(&opt->diffopt);
162                 opt->diffopt.output_format = saved_fmt;
163                 return 0;
164         }
165
166         if (opt->loginfo && !opt->no_commit_id)
167                 show_log(opt, opt->loginfo, opt->diffopt.with_stat ? "---\n" : "\n");
168         diff_flush(&opt->diffopt);
169         return 1;
170 }
171
172 static int diff_root_tree(struct rev_info *opt,
173                           const unsigned char *new, const char *base)
174 {
175         int retval;
176         void *tree;
177         struct tree_desc empty, real;
178
179         tree = read_object_with_reference(new, tree_type, &real.size, NULL);
180         if (!tree)
181                 die("unable to read root tree (%s)", sha1_to_hex(new));
182         real.buf = tree;
183
184         empty.buf = "";
185         empty.size = 0;
186         retval = diff_tree(&empty, &real, base, &opt->diffopt);
187         free(tree);
188         log_tree_diff_flush(opt);
189         return retval;
190 }
191
192 static int do_diff_combined(struct rev_info *opt, struct commit *commit)
193 {
194         unsigned const char *sha1 = commit->object.sha1;
195
196         diff_tree_combined_merge(sha1, opt->dense_combined_merges, opt);
197         return !opt->loginfo;
198 }
199
200 /*
201  * Show the diff of a commit.
202  *
203  * Return true if we printed any log info messages
204  */
205 static int log_tree_diff(struct rev_info *opt, struct commit *commit, struct log_info *log)
206 {
207         int showed_log;
208         struct commit_list *parents;
209         unsigned const char *sha1 = commit->object.sha1;
210
211         if (!opt->diff)
212                 return 0;
213
214         /* Root commit? */
215         parents = commit->parents;
216         if (!parents) {
217                 if (opt->show_root_diff)
218                         diff_root_tree(opt, sha1, "");
219                 return !opt->loginfo;
220         }
221
222         /* More than one parent? */
223         if (parents && parents->next) {
224                 if (opt->ignore_merges)
225                         return 0;
226                 else if (opt->combine_merges)
227                         return do_diff_combined(opt, commit);
228
229                 /* If we show individual diffs, show the parent info */
230                 log->parent = parents->item;
231         }
232
233         showed_log = 0;
234         for (;;) {
235                 struct commit *parent = parents->item;
236
237                 diff_tree_sha1(parent->object.sha1, sha1, "", &opt->diffopt);
238                 log_tree_diff_flush(opt);
239
240                 showed_log |= !opt->loginfo;
241
242                 /* Set up the log info for the next parent, if any.. */
243                 parents = parents->next;
244                 if (!parents)
245                         break;
246                 log->parent = parents->item;
247                 opt->loginfo = log;
248         }
249         return showed_log;
250 }
251
252 int log_tree_commit(struct rev_info *opt, struct commit *commit)
253 {
254         struct log_info log;
255         int shown;
256
257         log.commit = commit;
258         log.parent = NULL;
259         opt->loginfo = &log;
260
261         shown = log_tree_diff(opt, commit, &log);
262         if (!shown && opt->loginfo && opt->always_show_header) {
263                 log.parent = NULL;
264                 show_log(opt, opt->loginfo, "");
265                 shown = 1;
266         }
267         opt->loginfo = NULL;
268         return shown;
269 }