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