8 #include "parse-options.h"
9 #include "repository.h"
10 #include "commit-reach.h"
12 static int show_merge_base(struct commit **rev, int rev_nr, int show_all)
14 struct commit_list *result, *r;
16 result = get_merge_bases_many_dirty(rev[0], rev_nr - 1, rev + 1);
21 for (r = result; r; r = r->next) {
22 printf("%s\n", oid_to_hex(&r->item->object.oid));
27 free_commit_list(result);
31 static const char * const merge_base_usage[] = {
32 N_("git merge-base [-a | --all] <commit> <commit>..."),
33 N_("git merge-base [-a | --all] --octopus <commit>..."),
34 N_("git merge-base --independent <commit>..."),
35 N_("git merge-base --is-ancestor <commit> <commit>"),
36 N_("git merge-base --fork-point <ref> [<commit>]"),
40 static struct commit *get_commit_reference(const char *arg)
42 struct object_id revkey;
45 if (get_oid(arg, &revkey))
46 die("Not a valid object name %s", arg);
47 r = lookup_commit_reference(the_repository, &revkey);
49 die("Not a valid commit name %s", arg);
54 static int handle_independent(int count, const char **args)
56 struct commit_list *revs = NULL, *rev;
59 for (i = count - 1; i >= 0; i--)
60 commit_list_insert(get_commit_reference(args[i]), &revs);
62 reduce_heads_replace(&revs);
67 for (rev = revs; rev; rev = rev->next)
68 printf("%s\n", oid_to_hex(&rev->item->object.oid));
70 free_commit_list(revs);
74 static int handle_octopus(int count, const char **args, int show_all)
76 struct commit_list *revs = NULL;
77 struct commit_list *result, *rev;
80 for (i = count - 1; i >= 0; i--)
81 commit_list_insert(get_commit_reference(args[i]), &revs);
83 result = get_octopus_merge_bases(revs);
84 free_commit_list(revs);
85 reduce_heads_replace(&result);
90 for (rev = result; rev; rev = rev->next) {
91 printf("%s\n", oid_to_hex(&rev->item->object.oid));
96 free_commit_list(result);
100 static int handle_is_ancestor(int argc, const char **argv)
102 struct commit *one, *two;
105 die("--is-ancestor takes exactly two commits");
106 one = get_commit_reference(argv[0]);
107 two = get_commit_reference(argv[1]);
108 if (in_merge_bases(one, two))
114 static int handle_fork_point(int argc, const char **argv)
116 struct object_id oid;
118 struct commit *derived, *fork_point;
119 const char *commitname;
121 switch (dwim_ref(argv[0], strlen(argv[0]), &oid, &refname)) {
123 die("No such ref: '%s'", argv[0]);
127 die("Ambiguous refname: '%s'", argv[0]);
130 commitname = (argc == 2) ? argv[1] : "HEAD";
131 if (get_oid(commitname, &oid))
132 die("Not a valid object name: '%s'", commitname);
134 derived = lookup_commit_reference(the_repository, &oid);
136 fork_point = get_fork_point(refname, derived);
141 printf("%s\n", oid_to_hex(&fork_point->object.oid));
145 int cmd_merge_base(int argc, const char **argv, const char *prefix)
152 struct option options[] = {
153 OPT_BOOL('a', "all", &show_all, N_("output all common ancestors")),
154 OPT_CMDMODE(0, "octopus", &cmdmode,
155 N_("find ancestors for a single n-way merge"), 'o'),
156 OPT_CMDMODE(0, "independent", &cmdmode,
157 N_("list revs not reachable from others"), 'r'),
158 OPT_CMDMODE(0, "is-ancestor", &cmdmode,
159 N_("is the first one ancestor of the other?"), 'a'),
160 OPT_CMDMODE(0, "fork-point", &cmdmode,
161 N_("find where <commit> forked from reflog of <ref>"), 'f'),
165 git_config(git_default_config, NULL);
166 argc = parse_options(argc, argv, prefix, options, merge_base_usage, 0);
168 if (cmdmode == 'a') {
170 usage_with_options(merge_base_usage, options);
172 die("--is-ancestor cannot be used with --all");
173 return handle_is_ancestor(argc, argv);
176 if (cmdmode == 'r' && show_all)
177 die("--independent cannot be used with --all");
180 return handle_octopus(argc, argv, show_all);
183 return handle_independent(argc, argv);
185 if (cmdmode == 'f') {
186 if (argc < 1 || 2 < argc)
187 usage_with_options(merge_base_usage, options);
188 return handle_fork_point(argc, argv);
192 usage_with_options(merge_base_usage, options);
194 ALLOC_ARRAY(rev, argc);
196 rev[rev_nr++] = get_commit_reference(*argv++);
197 return show_merge_base(rev, rev_nr, show_all);