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 [--log] [--no-log] [--file <file>]";
  10
  11 static int merge_summary;
  12
  13 static int fmt_merge_msg_config(const char *key, const char *value)
  14 {
  15         static int found_merge_log = 0;
  16         if (!strcmp("merge.log", key)) {
  17                 found_merge_log = 1;
  18                 merge_summary = git_config_bool(key, value);
  19         }
  20         if (!found_merge_log && !strcmp("merge.summary", key))
  21                 merge_summary = git_config_bool(key, value);
  22         return 0;
  23 }
  24
  25 struct list {
  26         char **list;
  27         void **payload;
  28         unsigned nr, alloc;
  29 };
  30
  31 static void append_to_list(struct list *list, char *value, void *payload)
  32 {
  33         if (list->nr == list->alloc) {
  34                 list->alloc += 32;
  35                 list->list = xrealloc(list->list, sizeof(char *) * list->alloc);
  36                 list->payload = xrealloc(list->payload,
  37                                 sizeof(char *) * list->alloc);
  38         }
  39         list->payload[list->nr] = payload;
  40         list->list[list->nr++] = value;
  41 }
  42
  43 static int find_in_list(struct list *list, char *value)
  44 {
  45         int i;
  46
  47         for (i = 0; i < list->nr; i++)
  48                 if (!strcmp(list->list[i], value))
  49                         return i;
  50
  51         return -1;
  52 }
  53
  54 static void free_list(struct list *list)
  55 {
  56         int i;
  57
  58         if (list->alloc == 0)
  59                 return;
  60
  61         for (i = 0; i < list->nr; i++) {
  62                 free(list->list[i]);
  63                 free(list->payload[i]);
  64         }
  65         free(list->list);
  66         free(list->payload);
  67         list->nr = list->alloc = 0;
  68 }
  69
  70 struct src_data {
  71         struct list branch, tag, r_branch, generic;
  72         int head_status;
  73 };
  74
  75 static struct list srcs = { NULL, NULL, 0, 0};
  76 static struct list origins = { NULL, NULL, 0, 0};
  77
  78 static int handle_line(char *line)
  79 {
  80         int i, len = strlen(line);
  81         unsigned char *sha1;
  82         char *src, *origin;
  83         struct src_data *src_data;
  84         int pulling_head = 0;
  85
  86         if (len < 43 || line[40] != '\t')
  87                 return 1;
  88
  89         if (!prefixcmp(line + 41, "not-for-merge"))
  90                 return 0;
  91
  92         if (line[41] != '\t')
  93                 return 2;
  94
  95         line[40] = 0;
  96         sha1 = xmalloc(20);
  97         i = get_sha1(line, sha1);
  98         line[40] = '\t';
  99         if (i)
 100                 return 3;
 101
 102         if (line[len - 1] == '\n')
 103                 line[len - 1] = 0;
 104         line += 42;
 105
 106         src = strstr(line, " of ");
 107         if (src) {
 108                 *src = 0;
 109                 src += 4;
 110                 pulling_head = 0;
 111         } else {
 112                 src = line;
 113                 pulling_head = 1;
 114         }
 115
 116         i = find_in_list(&srcs, src);
 117         if (i < 0) {
 118                 i = srcs.nr;
 119                 append_to_list(&srcs, xstrdup(src),
 120                                 xcalloc(1, sizeof(struct src_data)));
 121         }
 122         src_data = srcs.payload[i];
 123
 124         if (pulling_head) {
 125                 origin = xstrdup(src);
 126                 src_data->head_status |= 1;
 127         } else if (!prefixcmp(line, "branch ")) {
 128                 origin = xstrdup(line + 7);
 129                 append_to_list(&src_data->branch, origin, NULL);
 130                 src_data->head_status |= 2;
 131         } else if (!prefixcmp(line, "tag ")) {
 132                 origin = line;
 133                 append_to_list(&src_data->tag, xstrdup(origin + 4), NULL);
 134                 src_data->head_status |= 2;
 135         } else if (!prefixcmp(line, "remote branch ")) {
 136                 origin = xstrdup(line + 14);
 137                 append_to_list(&src_data->r_branch, origin, NULL);
 138                 src_data->head_status |= 2;
 139         } else {
 140                 origin = xstrdup(src);
 141                 append_to_list(&src_data->generic, xstrdup(line), NULL);
 142                 src_data->head_status |= 2;
 143         }
 144
 145         if (!strcmp(".", src) || !strcmp(src, origin)) {
 146                 int len = strlen(origin);
 147                 if (origin[0] == '\'' && origin[len - 1] == '\'') {
 148                         origin = xmemdupz(origin + 1, len - 2);
 149                 } else {
 150                         origin = xstrdup(origin);
 151                 }
 152         } else {
 153                 char *new_origin = xmalloc(strlen(origin) + strlen(src) + 5);
 154                 sprintf(new_origin, "%s of %s", origin, src);
 155                 origin = new_origin;
 156         }
 157         append_to_list(&origins, origin, sha1);
 158         return 0;
 159 }
 160
 161 static void print_joined(const char *singular, const char *plural,
 162                 struct list *list)
 163 {
 164         if (list->nr == 0)
 165                 return;
 166         if (list->nr == 1) {
 167                 printf("%s%s", singular, list->list[0]);
 168         } else {
 169                 int i;
 170                 printf("%s", plural);
 171                 for (i = 0; i < list->nr - 1; i++)
 172                         printf("%s%s", i > 0 ? ", " : "", list->list[i]);
 173                 printf(" and %s", list->list[list->nr - 1]);
 174         }
 175 }
 176
 177 static void shortlog(const char *name, unsigned char *sha1,
 178                 struct commit *head, struct rev_info *rev, int limit)
 179 {
 180         int i, count = 0;
 181         struct commit *commit;
 182         struct object *branch;
 183         struct list subjects = { NULL, NULL, 0, 0 };
 184         int flags = UNINTERESTING | TREESAME | SEEN | SHOWN | ADDED;
 185
 186         branch = deref_tag(parse_object(sha1), sha1_to_hex(sha1), 40);
 187         if (!branch || branch->type != OBJ_COMMIT)
 188                 return;
 189
 190         setup_revisions(0, NULL, rev, NULL);
 191         rev->ignore_merges = 1;
 192         add_pending_object(rev, branch, name);
 193         add_pending_object(rev, &head->object, "^HEAD");
 194         head->object.flags |= UNINTERESTING;
 195         if (prepare_revision_walk(rev))
 196                 die("revision walk setup failed");
 197         while ((commit = get_revision(rev)) != NULL) {
 198                 char *oneline, *bol, *eol;
 199
 200                 /* ignore merges */
 201                 if (commit->parents && commit->parents->next)
 202                         continue;
 203
 204                 count++;
 205                 if (subjects.nr > limit)
 206                         continue;
 207
 208                 bol = strstr(commit->buffer, "\n\n");
 209                 if (!bol) {
 210                         append_to_list(&subjects, xstrdup(sha1_to_hex(
 211                                                         commit->object.sha1)),
 212                                         NULL);
 213                         continue;
 214                 }
 215
 216                 bol += 2;
 217                 eol = strchr(bol, '\n');
 218                 if (eol) {
 219                         oneline = xmemdupz(bol, eol - bol);
 220                 } else {
 221                         oneline = xstrdup(bol);
 222                 }
 223                 append_to_list(&subjects, oneline, NULL);
 224         }
 225
 226         if (count > limit)
 227                 printf("\n* %s: (%d commits)\n", name, count);
 228         else
 229                 printf("\n* %s:\n", name);
 230
 231         for (i = 0; i < subjects.nr; i++)
 232                 if (i >= limit)
 233                         printf("  ...\n");
 234                 else
 235                         printf("  %s\n", subjects.list[i]);
 236
 237         clear_commit_marks((struct commit *)branch, flags);
 238         clear_commit_marks(head, flags);
 239         free_commit_list(rev->commits);
 240         rev->commits = NULL;
 241         rev->pending.nr = 0;
 242
 243         free_list(&subjects);
 244 }
 245
 246 int cmd_fmt_merge_msg(int argc, const char **argv, const char *prefix)
 247 {
 248         int limit = 20, i = 0;
 249         char line[1024];
 250         FILE *in = stdin;
 251         const char *sep = "";
 252         unsigned char head_sha1[20];
 253         const char *current_branch;
 254
 255         git_config(fmt_merge_msg_config);
 256
 257         while (argc > 1) {
 258                 if (!strcmp(argv[1], "--log") || !strcmp(argv[1], "--summary"))
 259                         merge_summary = 1;
 260                 else if (!strcmp(argv[1], "--no-log")
 261                                 || !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 }