git/builtin-fmt-merge-msg.c

   1 #include "builtin.h"
   2 #include "cache.h"
   3 #include "commit.h"
   4 #include "diff.h"
   5 #include "revision.h"
   6 #include "tag.h"
   7
   8 static const char *fmt_merge_msg_usage =
   9         "git-fmt-merge-msg [--summary] [--no-summary] [--file <file>]";
  10
  11 static int merge_summary;
  12
  13 static int fmt_merge_msg_config(const char *key, const char *value)
  14 {
  15         if (!strcmp("merge.summary", key))
  16                 merge_summary = git_config_bool(key, value);
  17         return 0;
  18 }
  19
  20 struct list {
  21         char **list;
  22         void **payload;
  23         unsigned nr, alloc;
  24 };
  25
  26 static void append_to_list(struct list *list, char *value, void *payload)
  27 {
  28         if (list->nr == list->alloc) {
  29                 list->alloc += 32;
  30                 list->list = xrealloc(list->list, sizeof(char *) * list->alloc);
  31                 list->payload = xrealloc(list->payload,
  32                                 sizeof(char *) * list->alloc);
  33         }
  34         list->payload[list->nr] = payload;
  35         list->list[list->nr++] = value;
  36 }
  37
  38 static int find_in_list(struct list *list, char *value)
  39 {
  40         int i;
  41
  42         for (i = 0; i < list->nr; i++)
  43                 if (!strcmp(list->list[i], value))
  44                         return i;
  45
  46         return -1;
  47 }
  48
  49 static void free_list(struct list *list)
  50 {
  51         int i;
  52
  53         if (list->alloc == 0)
  54                 return;
  55
  56         for (i = 0; i < list->nr; i++) {
  57                 free(list->list[i]);
  58                 free(list->payload[i]);
  59         }
  60         free(list->list);
  61         free(list->payload);
  62         list->nr = list->alloc = 0;
  63 }
  64
  65 struct src_data {
  66         struct list branch, tag, r_branch, generic;
  67         int head_status;
  68 };
  69
  70 static struct list srcs = { NULL, NULL, 0, 0};
  71 static struct list origins = { NULL, NULL, 0, 0};
  72
  73 static int handle_line(char *line)
  74 {
  75         int i, len = strlen(line);
  76         unsigned char *sha1;
  77         char *src, *origin;
  78         struct src_data *src_data;
  79         int pulling_head = 0;
  80
  81         if (len < 43 || line[40] != '\t')
  82                 return 1;
  83
  84         if (!prefixcmp(line + 41, "not-for-merge"))
  85                 return 0;
  86
  87         if (line[41] != '\t')
  88                 return 2;
  89
  90         line[40] = 0;
  91         sha1 = xmalloc(20);
  92         i = get_sha1(line, sha1);
  93         line[40] = '\t';
  94         if (i)
  95                 return 3;
  96
  97         if (line[len - 1] == '\n')
  98                 line[len - 1] = 0, --len;
  99         if (line[len - 1] == '\r')
 100                 line[len - 1] = 0;
 101         line += 42;
 102
 103         src = strstr(line, " of ");
 104         if (src) {
 105                 *src = 0;
 106                 src += 4;
 107                 pulling_head = 0;
 108         } else {
 109                 src = line;
 110                 pulling_head = 1;
 111         }
 112
 113         i = find_in_list(&srcs, src);
 114         if (i < 0) {
 115                 i = srcs.nr;
 116                 append_to_list(&srcs, xstrdup(src),
 117                                 xcalloc(1, sizeof(struct src_data)));
 118         }
 119         src_data = srcs.payload[i];
 120
 121         if (pulling_head) {
 122                 origin = xstrdup(src);
 123                 src_data->head_status |= 1;
 124         } else if (!prefixcmp(line, "branch ")) {
 125                 origin = xstrdup(line + 7);
 126                 append_to_list(&src_data->branch, origin, NULL);
 127                 src_data->head_status |= 2;
 128         } else if (!prefixcmp(line, "tag ")) {
 129                 origin = line;
 130                 append_to_list(&src_data->tag, xstrdup(origin + 4), NULL);
 131                 src_data->head_status |= 2;
 132         } else if (!prefixcmp(line, "remote branch ")) {
 133                 origin = xstrdup(line + 14);
 134                 append_to_list(&src_data->r_branch, origin, NULL);
 135                 src_data->head_status |= 2;
 136         } else {
 137                 origin = xstrdup(src);
 138                 append_to_list(&src_data->generic, xstrdup(line), NULL);
 139                 src_data->head_status |= 2;
 140         }
 141
 142         if (!strcmp(".", src) || !strcmp(src, origin)) {
 143                 int len = strlen(origin);
 144                 if (origin[0] == '\'' && origin[len - 1] == '\'') {
 145                         char *new_origin = xmalloc(len - 1);
 146                         memcpy(new_origin, origin + 1, len - 2);
 147                         new_origin[len - 2] = 0;
 148                         origin = new_origin;
 149                 } else
 150                         origin = xstrdup(origin);
 151         } else {
 152                 char *new_origin = xmalloc(strlen(origin) + strlen(src) + 5);
 153                 sprintf(new_origin, "%s of %s", origin, src);
 154                 origin = new_origin;
 155         }
 156         append_to_list(&origins, origin, sha1);
 157         return 0;
 158 }
 159
 160 static void print_joined(const char *singular, const char *plural,
 161                 struct list *list)
 162 {
 163         if (list->nr == 0)
 164                 return;
 165         if (list->nr == 1) {
 166                 printf("%s%s", singular, list->list[0]);
 167         } else {
 168                 int i;
 169                 printf("%s", plural);
 170                 for (i = 0; i < list->nr - 1; i++)
 171                         printf("%s%s", i > 0 ? ", " : "", list->list[i]);
 172                 printf(" and %s", list->list[list->nr - 1]);
 173         }
 174 }
 175
 176 static void shortlog(const char *name, unsigned char *sha1,
 177                 struct commit *head, struct rev_info *rev, int limit)
 178 {
 179         int i, count = 0;
 180         struct commit *commit;
 181         struct object *branch;
 182         struct list subjects = { NULL, NULL, 0, 0 };
 183         int flags = UNINTERESTING | TREECHANGE | SEEN | SHOWN | ADDED;
 184
 185         branch = deref_tag(parse_object(sha1), sha1_to_hex(sha1), 40);
 186         if (!branch || branch->type != OBJ_COMMIT)
 187                 return;
 188
 189         setup_revisions(0, NULL, rev, NULL);
 190         rev->ignore_merges = 1;
 191         add_pending_object(rev, branch, name);
 192         add_pending_object(rev, &head->object, "^HEAD");
 193         head->object.flags |= UNINTERESTING;
 194         prepare_revision_walk(rev);
 195         while ((commit = get_revision(rev)) != NULL) {
 196                 char *oneline, *bol, *eol;
 197
 198                 /* ignore merges */
 199                 if (commit->parents && commit->parents->next)
 200                         continue;
 201
 202                 count++;
 203                 if (subjects.nr > limit)
 204                         continue;
 205
 206                 bol = strstr(commit->buffer, "\n\n");
 207                 if (!bol) {
 208                         append_to_list(&subjects, xstrdup(sha1_to_hex(
 209                                                         commit->object.sha1)),
 210                                         NULL);
 211                         continue;
 212                 }
 213
 214                 bol += 2;
 215                 eol = strchr(bol, '\n');
 216
 217                 if (eol) {
 218                         int len = eol - bol;
 219                         oneline = xmalloc(len + 1);
 220                         memcpy(oneline, bol, len);
 221                         oneline[len] = 0;
 222                 } else
 223                         oneline = xstrdup(bol);
 224                 append_to_list(&subjects, oneline, NULL);
 225         }
 226
 227         if (count > limit)
 228                 printf("\n* %s: (%d commits)\n", name, count);
 229         else
 230                 printf("\n* %s:\n", name);
 231
 232         for (i = 0; i < subjects.nr; i++)
 233                 if (i >= limit)
 234                         printf("  ...\n");
 235                 else
 236                         printf("  %s\n", subjects.list[i]);
 237
 238         clear_commit_marks((struct commit *)branch, flags);
 239         clear_commit_marks(head, flags);
 240         free_commit_list(rev->commits);
 241         rev->commits = NULL;
 242         rev->pending.nr = 0;
 243
 244         free_list(&subjects);
 245 }
 246
 247 int cmd_fmt_merge_msg(int argc, const char **argv, const char *prefix)
 248 {
 249         int limit = 20, i = 0;
 250         char line[1024];
 251         FILE *in = stdin;
 252         const char *sep = "";
 253         unsigned char head_sha1[20];
 254         const char *current_branch;
 255
 256         git_config(fmt_merge_msg_config);
 257
 258         while (argc > 1) {
 259                 if (!strcmp(argv[1], "--summary"))
 260                         merge_summary = 1;
 261                 else if (!strcmp(argv[1], "--no-summary"))
 262                         merge_summary = 0;
 263                 else if (!strcmp(argv[1], "-F") || !strcmp(argv[1], "--file")) {
 264                         if (argc < 3)
 265                                 die ("Which file?");
 266                         if (!strcmp(argv[2], "-"))
 267                                 in = stdin;
 268                         else {
 269                                 fclose(in);
 270                                 in = fopen(argv[2], "r");
 271                                 if (!in)
 272                                         die("cannot open %s", argv[2]);
 273                         }
 274                         argc--; argv++;
 275                 } else
 276                         break;
 277                 argc--; argv++;
 278         }
 279
 280         if (argc > 1)
 281                 usage(fmt_merge_msg_usage);
 282
 283         /* get current branch */
 284         current_branch = resolve_ref("HEAD", head_sha1, 1, NULL);
 285         if (!current_branch)
 286                 die("No current branch");
 287         if (!prefixcmp(current_branch, "refs/heads/"))
 288                 current_branch += 11;
 289
 290         while (fgets(line, sizeof(line), in)) {
 291                 i++;
 292                 if (line[0] == 0)
 293                         continue;
 294                 if (handle_line(line))
 295                         die ("Error in line %d: %s", i, line);
 296         }
 297
 298         printf("Merge ");
 299         for (i = 0; i < srcs.nr; i++) {
 300                 struct src_data *src_data = srcs.payload[i];
 301                 const char *subsep = "";
 302
 303                 printf(sep);
 304                 sep = "; ";
 305
 306                 if (src_data->head_status == 1) {
 307                         printf(srcs.list[i]);
 308                         continue;
 309                 }
 310                 if (src_data->head_status == 3) {
 311                         subsep = ", ";
 312                         printf("HEAD");
 313                 }
 314                 if (src_data->branch.nr) {
 315                         printf(subsep);
 316                         subsep = ", ";
 317                         print_joined("branch ", "branches ", &src_data->branch);
 318                 }
 319                 if (src_data->r_branch.nr) {
 320                         printf(subsep);
 321                         subsep = ", ";
 322                         print_joined("remote branch ", "remote branches ",
 323                                         &src_data->r_branch);
 324                 }
 325                 if (src_data->tag.nr) {
 326                         printf(subsep);
 327                         subsep = ", ";
 328                         print_joined("tag ", "tags ", &src_data->tag);
 329                 }
 330                 if (src_data->generic.nr) {
 331                         printf(subsep);
 332                         print_joined("commit ", "commits ", &src_data->generic);
 333                 }
 334                 if (strcmp(".", srcs.list[i]))
 335                         printf(" of %s", srcs.list[i]);
 336         }
 337
 338         if (!strcmp("master", current_branch))
 339                 putchar('\n');
 340         else
 341                 printf(" into %s\n", current_branch);
 342
 343         if (merge_summary) {
 344                 struct commit *head;
 345                 struct rev_info rev;
 346
 347                 head = lookup_commit(head_sha1);
 348                 init_revisions(&rev, prefix);
 349                 rev.commit_format = CMIT_FMT_ONELINE;
 350                 rev.ignore_merges = 1;
 351                 rev.limited = 1;
 352
 353                 for (i = 0; i < origins.nr; i++)
 354                         shortlog(origins.list[i], origins.payload[i],
 355                                         head, &rev, limit);
 356         }
 357
 358         /* No cleanup yet; is standalone anyway */
 359
 360         return 0;
 361 }