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