Merge branch 'sb/string-list-remove-unused'
[git] / builtin / merge-recursive.c
1 #include "builtin.h"
2 #include "commit.h"
3 #include "tag.h"
4 #include "merge-recursive.h"
5 #include "xdiff-interface.h"
6
7 static const char builtin_merge_recursive_usage[] =
8         "git %s <base>... -- <head> <remote> ...";
9
10 static const char *better_branch_name(const char *branch)
11 {
12         static char githead_env[8 + GIT_MAX_HEXSZ + 1];
13         char *name;
14
15         if (strlen(branch) != the_hash_algo->hexsz)
16                 return branch;
17         xsnprintf(githead_env, sizeof(githead_env), "GITHEAD_%s", branch);
18         name = getenv(githead_env);
19         return name ? name : branch;
20 }
21
22 int cmd_merge_recursive(int argc, const char **argv, const char *prefix)
23 {
24         const struct object_id *bases[21];
25         unsigned bases_count = 0;
26         int i, failed;
27         struct object_id h1, h2;
28         struct merge_options o;
29         struct commit *result;
30
31         init_merge_options(&o);
32         if (argv[0] && ends_with(argv[0], "-subtree"))
33                 o.subtree_shift = "";
34
35         if (argc < 4)
36                 usagef(builtin_merge_recursive_usage, argv[0]);
37
38         for (i = 1; i < argc; ++i) {
39                 const char *arg = argv[i];
40
41                 if (starts_with(arg, "--")) {
42                         if (!arg[2])
43                                 break;
44                         if (parse_merge_opt(&o, arg + 2))
45                                 die(_("unknown option %s"), arg);
46                         continue;
47                 }
48                 if (bases_count < ARRAY_SIZE(bases)-1) {
49                         struct object_id *oid = xmalloc(sizeof(struct object_id));
50                         if (get_oid(argv[i], oid))
51                                 die(_("could not parse object '%s'"), argv[i]);
52                         bases[bases_count++] = oid;
53                 }
54                 else
55                         warning(Q_("cannot handle more than %d base. "
56                                    "Ignoring %s.",
57                                    "cannot handle more than %d bases. "
58                                    "Ignoring %s.",
59                                     (int)ARRAY_SIZE(bases)-1),
60                                 (int)ARRAY_SIZE(bases)-1, argv[i]);
61         }
62         if (argc - i != 3) /* "--" "<head>" "<remote>" */
63                 die(_("not handling anything other than two heads merge."));
64
65         o.branch1 = argv[++i];
66         o.branch2 = argv[++i];
67
68         if (get_oid(o.branch1, &h1))
69                 die(_("could not resolve ref '%s'"), o.branch1);
70         if (get_oid(o.branch2, &h2))
71                 die(_("could not resolve ref '%s'"), o.branch2);
72
73         o.branch1 = better_branch_name(o.branch1);
74         o.branch2 = better_branch_name(o.branch2);
75
76         if (o.verbosity >= 3)
77                 printf(_("Merging %s with %s\n"), o.branch1, o.branch2);
78
79         failed = merge_recursive_generic(&o, &h1, &h2, bases_count, bases, &result);
80         if (failed < 0)
81                 return 128; /* die() error code */
82         return failed;
83 }