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