Andrew's git - gitweb.git/blob - 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
   8static const char * const fmt_merge_msg_usage[] = {
   9        "git fmt-merge-msg [--log|--no-log] [--file <file>]",
  10        NULL
  11};
  12
  13static int merge_summary;
  14
  15static int fmt_merge_msg_config(const char *key, const char *value, void *cb)
  16{
  17        static int found_merge_log = 0;
  18        if (!strcmp("merge.log", key)) {
  19                found_merge_log = 1;
  20                merge_summary = git_config_bool(key, value);
  21        }
  22        if (!found_merge_log && !strcmp("merge.summary", key))
  23                merge_summary = git_config_bool(key, value);
  24        return 0;
  25}
  26
  27struct list {
  28        char **list;
  29        void **payload;
  30        unsigned nr, alloc;
  31};
  32
  33static void append_to_list(struct list *list, char *value, void *payload)
  34{
  35        if (list->nr == list->alloc) {
  36                list->alloc += 32;
  37                list->list = xrealloc(list->list, sizeof(char *) * list->alloc);
  38                list->payload = xrealloc(list->payload,
  39                                sizeof(char *) * list->alloc);
  40        }
  41        list->payload[list->nr] = payload;
  42        list->list[list->nr++] = value;
  43}
  44
  45static int find_in_list(struct list *list, char *value)
  46{
  47        int i;
  48
  49        for (i = 0; i < list->nr; i++)
  50                if (!strcmp(list->list[i], value))
  51                        return i;
  52
  53        return -1;
  54}
  55
  56static void free_list(struct list *list)
  57{
  58        int i;
  59
  60        if (list->alloc == 0)
  61                return;
  62
  63        for (i = 0; i < list->nr; i++) {
  64                free(list->list[i]);
  65                free(list->payload[i]);
  66        }
  67        free(list->list);
  68        free(list->payload);
  69        list->nr = list->alloc = 0;
  70}
  71
  72struct src_data {
  73        struct list branch, tag, r_branch, generic;
  74        int head_status;
  75};
  76
  77static struct list srcs = { NULL, NULL, 0, 0};
  78static struct list origins = { NULL, NULL, 0, 0};
  79
  80static int handle_line(char *line)
  81{
  82        int i, len = strlen(line);
  83        unsigned char *sha1;
  84        char *src, *origin;
  85        struct src_data *src_data;
  86        int pulling_head = 0;
  87
  88        if (len < 43 || line[40] != '\t')
  89                return 1;
  90
  91        if (!prefixcmp(line + 41, "not-for-merge"))
  92                return 0;
  93
  94        if (line[41] != '\t')
  95                return 2;
  96
  97        line[40] = 0;
  98        sha1 = xmalloc(20);
  99        i = get_sha1(line, sha1);
 100        line[40] = '\t';
 101        if (i)
 102                return 3;
 103
 104        if (line[len - 1] == '\n')
 105                line[len - 1] = 0;
 106        line += 42;
 107
 108        src = strstr(line, " of ");
 109        if (src) {
 110                *src = 0;
 111                src += 4;
 112                pulling_head = 0;
 113        } else {
 114                src = line;
 115                pulling_head = 1;
 116        }
 117
 118        i = find_in_list(&srcs, src);
 119        if (i < 0) {
 120                i = srcs.nr;
 121                append_to_list(&srcs, xstrdup(src),
 122                                xcalloc(1, sizeof(struct src_data)));
 123        }
 124        src_data = srcs.payload[i];
 125
 126        if (pulling_head) {
 127                origin = xstrdup(src);
 128                src_data->head_status |= 1;
 129        } else if (!prefixcmp(line, "branch ")) {
 130                origin = xstrdup(line + 7);
 131                append_to_list(&src_data->branch, origin, NULL);
 132                src_data->head_status |= 2;
 133        } else if (!prefixcmp(line, "tag ")) {
 134                origin = line;
 135                append_to_list(&src_data->tag, xstrdup(origin + 4), NULL);
 136                src_data->head_status |= 2;
 137        } else if (!prefixcmp(line, "remote branch ")) {
 138                origin = xstrdup(line + 14);
 139                append_to_list(&src_data->r_branch, origin, NULL);
 140                src_data->head_status |= 2;
 141        } else {
 142                origin = xstrdup(src);
 143                append_to_list(&src_data->generic, xstrdup(line), NULL);
 144                src_data->head_status |= 2;
 145        }
 146
 147        if (!strcmp(".", src) || !strcmp(src, origin)) {
 148                int len = strlen(origin);
 149                if (origin[0] == '\'' && origin[len - 1] == '\'') {
 150                        origin = xmemdupz(origin + 1, len - 2);
 151                } else {
 152                        origin = xstrdup(origin);
 153                }
 154        } else {
 155                char *new_origin = xmalloc(strlen(origin) + strlen(src) + 5);
 156                sprintf(new_origin, "%s of %s", origin, src);
 157                origin = new_origin;
 158        }
 159        append_to_list(&origins, origin, sha1);
 160        return 0;
 161}
 162
 163static void print_joined(const char *singular, const char *plural,
 164                struct list *list, struct strbuf *out)
 165{
 166        if (list->nr == 0)
 167                return;
 168        if (list->nr == 1) {
 169                strbuf_addf(out, "%s%s", singular, list->list[0]);
 170        } else {
 171                int i;
 172                strbuf_addstr(out, plural);
 173                for (i = 0; i < list->nr - 1; i++)
 174                        strbuf_addf(out, "%s%s", i > 0 ? ", " : "", list->list[i]);
 175                strbuf_addf(out, " and %s", list->list[list->nr - 1]);
 176        }
 177}
 178
 179static void shortlog(const char *name, unsigned char *sha1,
 180                struct commit *head, struct rev_info *rev, int limit,
 181                struct strbuf *out)
 182{
 183        int i, count = 0;
 184        struct commit *commit;
 185        struct object *branch;
 186        struct list subjects = { NULL, NULL, 0, 0 };
 187        int flags = UNINTERESTING | TREESAME | SEEN | SHOWN | ADDED;
 188
 189        branch = deref_tag(parse_object(sha1), sha1_to_hex(sha1), 40);
 190        if (!branch || branch->type != OBJ_COMMIT)
 191                return;
 192
 193        setup_revisions(0, NULL, rev, NULL);
 194        rev->ignore_merges = 1;
 195        add_pending_object(rev, branch, name);
 196        add_pending_object(rev, &head->object, "^HEAD");
 197        head->object.flags |= UNINTERESTING;
 198        if (prepare_revision_walk(rev))
 199                die("revision walk setup failed");
 200        while ((commit = get_revision(rev)) != NULL) {
 201                char *oneline, *bol, *eol;
 202
 203                /* ignore merges */
 204                if (commit->parents && commit->parents->next)
 205                        continue;
 206
 207                count++;
 208                if (subjects.nr > limit)
 209                        continue;
 210
 211                bol = strstr(commit->buffer, "\n\n");
 212                if (bol) {
 213                        unsigned char c;
 214                        do {
 215                                c = *++bol;
 216                        } while (isspace(c));
 217                        if (!c)
 218                                bol = NULL;
 219                }
 220
 221                if (!bol) {
 222                        append_to_list(&subjects, xstrdup(sha1_to_hex(
 223                                                        commit->object.sha1)),
 224                                        NULL);
 225                        continue;
 226                }
 227
 228                eol = strchr(bol, '\n');
 229                if (eol) {
 230                        oneline = xmemdupz(bol, eol - bol);
 231                } else {
 232                        oneline = xstrdup(bol);
 233                }
 234                append_to_list(&subjects, oneline, NULL);
 235        }
 236
 237        if (count > limit)
 238                strbuf_addf(out, "\n* %s: (%d commits)\n", name, count);
 239        else
 240                strbuf_addf(out, "\n* %s:\n", name);
 241
 242        for (i = 0; i < subjects.nr; i++)
 243                if (i >= limit)
 244                        strbuf_addf(out, "  ...\n");
 245                else
 246                        strbuf_addf(out, "  %s\n", subjects.list[i]);
 247
 248        clear_commit_marks((struct commit *)branch, flags);
 249        clear_commit_marks(head, flags);
 250        free_commit_list(rev->commits);
 251        rev->commits = NULL;
 252        rev->pending.nr = 0;
 253
 254        free_list(&subjects);
 255}
 256
 257int fmt_merge_msg(int merge_summary, struct strbuf *in, struct strbuf *out) {
 258        int limit = 20, i = 0, pos = 0;
 259        char *sep = "";
 260        unsigned char head_sha1[20];
 261        const char *current_branch;
 262
 263        /* get current branch */
 264        current_branch = resolve_ref("HEAD", head_sha1, 1, NULL);
 265        if (!current_branch)
 266                die("No current branch");
 267        if (!prefixcmp(current_branch, "refs/heads/"))
 268                current_branch += 11;
 269
 270        /* get a line */
 271        while (pos < in->len) {
 272                int len;
 273                char *newline, *p = in->buf + pos;
 274
 275                newline = strchr(p, '\n');
 276                len = newline ? newline - p : strlen(p);
 277                pos += len + !!newline;
 278                i++;
 279                p[len] = 0;
 280                if (handle_line(p))
 281                        die ("Error in line %d: %.*s", i, len, p);
 282        }
 283
 284        strbuf_addstr(out, "Merge ");
 285        for (i = 0; i < srcs.nr; i++) {
 286                struct src_data *src_data = srcs.payload[i];
 287                const char *subsep = "";
 288
 289                strbuf_addstr(out, sep);
 290                sep = "; ";
 291
 292                if (src_data->head_status == 1) {
 293                        strbuf_addstr(out, srcs.list[i]);
 294                        continue;
 295                }
 296                if (src_data->head_status == 3) {
 297                        subsep = ", ";
 298                        strbuf_addstr(out, "HEAD");
 299                }
 300                if (src_data->branch.nr) {
 301                        strbuf_addstr(out, subsep);
 302                        subsep = ", ";
 303                        print_joined("branch ", "branches ", &src_data->branch,
 304                                        out);
 305                }
 306                if (src_data->r_branch.nr) {
 307                        strbuf_addstr(out, subsep);
 308                        subsep = ", ";
 309                        print_joined("remote branch ", "remote branches ",
 310                                        &src_data->r_branch, out);
 311                }
 312                if (src_data->tag.nr) {
 313                        strbuf_addstr(out, subsep);
 314                        subsep = ", ";
 315                        print_joined("tag ", "tags ", &src_data->tag, out);
 316                }
 317                if (src_data->generic.nr) {
 318                        strbuf_addstr(out, subsep);
 319                        print_joined("commit ", "commits ", &src_data->generic,
 320                                        out);
 321                }
 322                if (strcmp(".", srcs.list[i]))
 323                        strbuf_addf(out, " of %s", srcs.list[i]);
 324        }
 325
 326        if (!strcmp("master", current_branch))
 327                strbuf_addch(out, '\n');
 328        else
 329                strbuf_addf(out, " into %s\n", current_branch);
 330
 331        if (merge_summary) {
 332                struct commit *head;
 333                struct rev_info rev;
 334
 335                head = lookup_commit(head_sha1);
 336                init_revisions(&rev, NULL);
 337                rev.commit_format = CMIT_FMT_ONELINE;
 338                rev.ignore_merges = 1;
 339                rev.limited = 1;
 340
 341                for (i = 0; i < origins.nr; i++)
 342                        shortlog(origins.list[i], origins.payload[i],
 343                                        head, &rev, limit, out);
 344        }
 345        return 0;
 346}
 347
 348int cmd_fmt_merge_msg(int argc, const char **argv, const char *prefix)
 349{
 350        const char *inpath = NULL;
 351        struct option options[] = {
 352                OPT_BOOLEAN(0, "log",     &merge_summary, "populate log with the shortlog"),
 353                OPT_BOOLEAN(0, "summary", &merge_summary, "alias for --log"),
 354                OPT_FILENAME('F', "file", &inpath, "file to read from"),
 355                OPT_END()
 356        };
 357
 358        FILE *in = stdin;
 359        struct strbuf input = STRBUF_INIT, output = STRBUF_INIT;
 360        int ret;
 361
 362        git_config(fmt_merge_msg_config, NULL);
 363        argc = parse_options(argc, argv, prefix, options, fmt_merge_msg_usage,
 364                             0);
 365        if (argc > 0)
 366                usage_with_options(fmt_merge_msg_usage, options);
 367
 368        if (inpath && strcmp(inpath, "-")) {
 369                in = fopen(inpath, "r");
 370                if (!in)
 371                        die_errno("cannot open '%s'", inpath);
 372        }
 373
 374        if (strbuf_read(&input, fileno(in), 0) < 0)
 375                die_errno("could not read input file");
 376        ret = fmt_merge_msg(merge_summary, &input, &output);
 377        if (ret)
 378                return ret;
 379        write_in_full(STDOUT_FILENO, output.buf, output.len);
 380        return 0;
 381}