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 /*
  16  * Search for "^[-A-Za-z]+: [^@]+@" pattern. It usually matches
  17  * Signed-off-by: and Acked-by: lines.
  18  */
  19 static int detect_any_signoff(char *letter, int size)
  20 {
  21         char ch, *cp;
  22         int seen_colon = 0;
  23         int seen_at = 0;
  24         int seen_name = 0;
  25         int seen_head = 0;
  26
  27         cp = letter + size;
  28         while (letter <= --cp && (ch = *cp) == '\n')
  29                 continue;
  30
  31         while (letter <= cp) {
  32                 ch = *cp--;
  33                 if (ch == '\n')
  34                         break;
  35
  36                 if (!seen_at) {
  37                         if (ch == '@')
  38                                 seen_at = 1;
  39                         continue;
  40                 }
  41                 if (!seen_colon) {
  42                         if (ch == '@')
  43                                 return 0;
  44                         else if (ch == ':')
  45                                 seen_colon = 1;
  46                         else
  47                                 seen_name = 1;
  48                         continue;
  49                 }
  50                 if (('A' <= ch && ch <= 'Z') ||
  51                     ('a' <= ch && ch <= 'z') ||
  52                     ch == '-') {
  53                         seen_head = 1;
  54                         continue;
  55                 }
  56                 /* no empty last line doesn't match */
  57                 return 0;
  58         }
  59         return seen_head && seen_name;
  60 }
  61
  62 static int append_signoff(char *buf, int buf_sz, int at, const char *signoff)
  63 {
  64         static const char signed_off_by[] = "Signed-off-by: ";
  65         int signoff_len = strlen(signoff);
  66         int has_signoff = 0;
  67         char *cp = buf;
  68
  69         /* Do we have enough space to add it? */
  70         if (buf_sz - at <= strlen(signed_off_by) + signoff_len + 3)
  71                 return at;
  72
  73         /* First see if we already have the sign-off by the signer */
  74         while ((cp = strstr(cp, signed_off_by))) {
  75
  76                 has_signoff = 1;
  77
  78                 cp += strlen(signed_off_by);
  79                 if (cp + signoff_len >= buf + at)
  80                         break;
  81                 if (strncmp(cp, signoff, signoff_len))
  82                         continue;
  83                 if (!isspace(cp[signoff_len]))
  84                         continue;
  85                 /* we already have him */
  86                 return at;
  87         }
  88
  89         if (!has_signoff)
  90                 has_signoff = detect_any_signoff(buf, at);
  91
  92         if (!has_signoff)
  93                 buf[at++] = '\n';
  94
  95         strcpy(buf + at, signed_off_by);
  96         at += strlen(signed_off_by);
  97         strcpy(buf + at, signoff);
  98         at += signoff_len;
  99         buf[at++] = '\n';
 100         buf[at] = 0;
 101         return at;
 102 }
 103
 104 void show_log(struct rev_info *opt, const char *sep)
 105 {
 106         static char this_header[16384];
 107         struct log_info *log = opt->loginfo;
 108         struct commit *commit = log->commit, *parent = log->parent;
 109         int abbrev = opt->diffopt.abbrev;
 110         int abbrev_commit = opt->abbrev_commit ? opt->abbrev : 40;
 111         const char *extra;
 112         int len;
 113         const char *subject = NULL, *extra_headers = opt->extra_headers;
 114
 115         opt->loginfo = NULL;
 116         if (!opt->verbose_header) {
 117                 fputs(diff_unique_abbrev(commit->object.sha1, abbrev_commit), stdout);
 118                 if (opt->parents)
 119                         show_parents(commit, abbrev_commit);
 120                 putchar(opt->diffopt.line_termination);
 121                 return;
 122         }
 123
 124         /*
 125          * The "oneline" format has several special cases:
 126          *  - The pretty-printed commit lacks a newline at the end
 127          *    of the buffer, but we do want to make sure that we
 128          *    have a newline there. If the separator isn't already
 129          *    a newline, add an extra one.
 130          *  - unlike other log messages, the one-line format does
 131          *    not have an empty line between entries.
 132          */
 133         extra = "";
 134         if (*sep != '\n' && opt->commit_format == CMIT_FMT_ONELINE)
 135                 extra = "\n";
 136         if (opt->shown_one && opt->commit_format != CMIT_FMT_ONELINE)
 137                 putchar('\n');
 138         opt->shown_one = 1;
 139
 140         /*
 141          * Print header line of header..
 142          */
 143
 144         if (opt->commit_format == CMIT_FMT_EMAIL) {
 145                 char *sha1 = sha1_to_hex(commit->object.sha1);
 146                 if (opt->total > 0) {
 147                         static char buffer[64];
 148                         snprintf(buffer, sizeof(buffer),
 149                                         "Subject: [PATCH %d/%d] ",
 150                                         opt->nr, opt->total);
 151                         subject = buffer;
 152                 } else if (opt->total == 0)
 153                         subject = "Subject: [PATCH] ";
 154                 else
 155                         subject = "Subject: ";
 156
 157                 printf("From %s Mon Sep 17 00:00:00 2001\n", sha1);
 158                 if (opt->message_id)
 159                         printf("Message-Id: <%s>\n", opt->message_id);
 160                 if (opt->ref_message_id)
 161                         printf("In-Reply-To: <%s>\nReferences: <%s>\n",
 162                                opt->ref_message_id, opt->ref_message_id);
 163                 if (opt->mime_boundary) {
 164                         static char subject_buffer[1024];
 165                         static char buffer[1024];
 166                         snprintf(subject_buffer, sizeof(subject_buffer) - 1,
 167                                  "%s"
 168                                  "MIME-Version: 1.0\n"
 169                                  "Content-Type: multipart/mixed;\n"
 170                                  " boundary=\"%s%s\"\n"
 171                                  "\n"
 172                                  "This is a multi-part message in MIME "
 173                                  "format.\n"
 174                                  "--%s%s\n"
 175                                  "Content-Type: text/plain; "
 176                                  "charset=UTF-8; format=fixed\n"
 177                                  "Content-Transfer-Encoding: 8bit\n\n",
 178                                  extra_headers ? extra_headers : "",
 179                                  mime_boundary_leader, opt->mime_boundary,
 180                                  mime_boundary_leader, opt->mime_boundary);
 181                         extra_headers = subject_buffer;
 182
 183                         snprintf(buffer, sizeof(buffer) - 1,
 184                                  "--%s%s\n"
 185                                  "Content-Type: text/x-patch;\n"
 186                                  " name=\"%s.diff\"\n"
 187                                  "Content-Transfer-Encoding: 8bit\n"
 188                                  "Content-Disposition: inline;\n"
 189                                  " filename=\"%s.diff\"\n\n",
 190                                  mime_boundary_leader, opt->mime_boundary,
 191                                  sha1, sha1);
 192                         opt->diffopt.stat_sep = buffer;
 193                 }
 194         } else {
 195                 printf("%s%s%s",
 196                        diff_get_color(opt->diffopt.color_diff, DIFF_COMMIT),
 197                        opt->commit_format == CMIT_FMT_ONELINE ? "" : "commit ",
 198                        diff_unique_abbrev(commit->object.sha1, abbrev_commit));
 199                 if (opt->parents)
 200                         show_parents(commit, abbrev_commit);
 201                 if (parent)
 202                         printf(" (from %s)",
 203                                diff_unique_abbrev(parent->object.sha1,
 204                                                   abbrev_commit));
 205                 printf("%s",
 206                        diff_get_color(opt->diffopt.color_diff, DIFF_RESET));
 207                 putchar(opt->commit_format == CMIT_FMT_ONELINE ? ' ' : '\n');
 208         }
 209
 210         /*
 211          * And then the pretty-printed message itself
 212          */
 213         len = pretty_print_commit(opt->commit_format, commit, ~0u, this_header,
 214                                   sizeof(this_header), abbrev, subject,
 215                                   extra_headers, opt->relative_date);
 216
 217         if (opt->add_signoff)
 218                 len = append_signoff(this_header, sizeof(this_header), len,
 219                                      opt->add_signoff);
 220         printf("%s%s%s", this_header, extra, sep);
 221 }
 222
 223 int log_tree_diff_flush(struct rev_info *opt)
 224 {
 225         diffcore_std(&opt->diffopt);
 226
 227         if (diff_queue_is_empty()) {
 228                 int saved_fmt = opt->diffopt.output_format;
 229                 opt->diffopt.output_format = DIFF_FORMAT_NO_OUTPUT;
 230                 diff_flush(&opt->diffopt);
 231                 opt->diffopt.output_format = saved_fmt;
 232                 return 0;
 233         }
 234
 235         if (opt->loginfo && !opt->no_commit_id) {
 236                 /* When showing a verbose header (i.e. log message),
 237                  * and not in --pretty=oneline format, we would want
 238                  * an extra newline between the end of log and the
 239                  * output for readability.
 240                  */
 241                 show_log(opt, opt->diffopt.msg_sep);
 242                 if (opt->verbose_header &&
 243                     opt->commit_format != CMIT_FMT_ONELINE) {
 244                         int pch = DIFF_FORMAT_DIFFSTAT | DIFF_FORMAT_PATCH;
 245                         if ((pch & opt->diffopt.output_format) == pch)
 246                                 printf("---%c", opt->diffopt.line_termination);
 247                         else
 248                                 putchar(opt->diffopt.line_termination);
 249                 }
 250         }
 251         diff_flush(&opt->diffopt);
 252         return 1;
 253 }
 254
 255 static int diff_root_tree(struct rev_info *opt,
 256                           const unsigned char *new, const char *base)
 257 {
 258         int retval;
 259         void *tree;
 260         struct tree_desc empty, real;
 261
 262         tree = read_object_with_reference(new, tree_type, &real.size, NULL);
 263         if (!tree)
 264                 die("unable to read root tree (%s)", sha1_to_hex(new));
 265         real.buf = tree;
 266
 267         empty.buf = "";
 268         empty.size = 0;
 269         retval = diff_tree(&empty, &real, base, &opt->diffopt);
 270         free(tree);
 271         log_tree_diff_flush(opt);
 272         return retval;
 273 }
 274
 275 static int do_diff_combined(struct rev_info *opt, struct commit *commit)
 276 {
 277         unsigned const char *sha1 = commit->object.sha1;
 278
 279         diff_tree_combined_merge(sha1, opt->dense_combined_merges, opt);
 280         return !opt->loginfo;
 281 }
 282
 283 /*
 284  * Show the diff of a commit.
 285  *
 286  * Return true if we printed any log info messages
 287  */
 288 static int log_tree_diff(struct rev_info *opt, struct commit *commit, struct log_info *log)
 289 {
 290         int showed_log;
 291         struct commit_list *parents;
 292         unsigned const char *sha1 = commit->object.sha1;
 293
 294         if (!opt->diff)
 295                 return 0;
 296
 297         /* Root commit? */
 298         parents = commit->parents;
 299         if (!parents) {
 300                 if (opt->show_root_diff)
 301                         diff_root_tree(opt, sha1, "");
 302                 return !opt->loginfo;
 303         }
 304
 305         /* More than one parent? */
 306         if (parents && parents->next) {
 307                 if (opt->ignore_merges)
 308                         return 0;
 309                 else if (opt->combine_merges)
 310                         return do_diff_combined(opt, commit);
 311
 312                 /* If we show individual diffs, show the parent info */
 313                 log->parent = parents->item;
 314         }
 315
 316         showed_log = 0;
 317         for (;;) {
 318                 struct commit *parent = parents->item;
 319
 320                 diff_tree_sha1(parent->object.sha1, sha1, "", &opt->diffopt);
 321                 log_tree_diff_flush(opt);
 322
 323                 showed_log |= !opt->loginfo;
 324
 325                 /* Set up the log info for the next parent, if any.. */
 326                 parents = parents->next;
 327                 if (!parents)
 328                         break;
 329                 log->parent = parents->item;
 330                 opt->loginfo = log;
 331         }
 332         return showed_log;
 333 }
 334
 335 int log_tree_commit(struct rev_info *opt, struct commit *commit)
 336 {
 337         struct log_info log;
 338         int shown;
 339
 340         log.commit = commit;
 341         log.parent = NULL;
 342         opt->loginfo = &log;
 343
 344         shown = log_tree_diff(opt, commit, &log);
 345         if (!shown && opt->loginfo && opt->always_show_header) {
 346                 log.parent = NULL;
 347                 show_log(opt, "");
 348                 shown = 1;
 349         }
 350         opt->loginfo = NULL;
 351         return shown;
 352 }