Andrew's git - gitweb.git/blob - builtin/merge-base.c

   1#include "builtin.h"
   2#include "cache.h"
   3#include "commit.h"
   4#include "parse-options.h"
   5
   6static int show_merge_base(struct commit **rev, int rev_nr, int show_all)
   7{
   8        struct commit_list *result;
   9
  10        result = get_merge_bases_many(rev[0], rev_nr - 1, rev + 1, 0);
  11
  12        if (!result)
  13                return 1;
  14
  15        while (result) {
  16                printf("%s\n", sha1_to_hex(result->item->object.sha1));
  17                if (!show_all)
  18                        return 0;
  19                result = result->next;
  20        }
  21
  22        return 0;
  23}
  24
  25static const char * const merge_base_usage[] = {
  26        "git merge-base [-a|--all] <commit> <commit>...",
  27        "git merge-base [-a|--all] --octopus <commit>...",
  28        "git merge-base --independent <commit>...",
  29        NULL
  30};
  31
  32static struct commit *get_commit_reference(const char *arg)
  33{
  34        unsigned char revkey[20];
  35        struct commit *r;
  36
  37        if (get_sha1(arg, revkey))
  38                die("Not a valid object name %s", arg);
  39        r = lookup_commit_reference(revkey);
  40        if (!r)
  41                die("Not a valid commit name %s", arg);
  42
  43        return r;
  44}
  45
  46static int handle_octopus(int count, const char **args, int reduce, int show_all)
  47{
  48        struct commit_list *revs = NULL;
  49        struct commit_list *result;
  50        int i;
  51
  52        if (reduce)
  53                show_all = 1;
  54
  55        for (i = count - 1; i >= 0; i--)
  56                commit_list_insert(get_commit_reference(args[i]), &revs);
  57
  58        result = reduce ? reduce_heads(revs) : get_octopus_merge_bases(revs);
  59
  60        if (!result)
  61                return 1;
  62
  63        while (result) {
  64                printf("%s\n", sha1_to_hex(result->item->object.sha1));
  65                if (!show_all)
  66                        return 0;
  67                result = result->next;
  68        }
  69
  70        return 0;
  71}
  72
  73int cmd_merge_base(int argc, const char **argv, const char *prefix)
  74{
  75        struct commit **rev;
  76        int rev_nr = 0;
  77        int show_all = 0;
  78        int octopus = 0;
  79        int reduce = 0;
  80
  81        struct option options[] = {
  82                OPT_BOOLEAN('a', "all", &show_all, "output all common ancestors"),
  83                OPT_BOOLEAN(0, "octopus", &octopus, "find ancestors for a single n-way merge"),
  84                OPT_BOOLEAN(0, "independent", &reduce, "list revs not reachable from others"),
  85                OPT_END()
  86        };
  87
  88        git_config(git_default_config, NULL);
  89        argc = parse_options(argc, argv, prefix, options, merge_base_usage, 0);
  90        if (!octopus && !reduce && argc < 2)
  91                usage_with_options(merge_base_usage, options);
  92        if (reduce && (show_all || octopus))
  93                die("--independent cannot be used with other options");
  94
  95        if (octopus || reduce)
  96                return handle_octopus(argc, argv, reduce, show_all);
  97
  98        rev = xmalloc(argc * sizeof(*rev));
  99        while (argc-- > 0)
 100                rev[rev_nr++] = get_commit_reference(*argv++);
 101        return show_merge_base(rev, rev_nr, show_all);
 102}