builtin-fmt-merge-msg.c

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