move index_has_changes() from builtin/am.c to merge.c for reuse
[git/git.git] / merge.c
diff --git a/merge.c b/merge.c
index 1d441ad..b0714bc 100644 (file)
--- a/merge.c
+++ b/merge.c
@@ -1,4 +1,6 @@
 #include "cache.h"
 #include "cache.h"
+#include "diff.h"
+#include "diffcore.h"
 #include "lockfile.h"
 #include "commit.h"
 #include "run-command.h"
 #include "lockfile.h"
 #include "commit.h"
 #include "run-command.h"
@@ -15,6 +17,37 @@ static const char *merge_argument(struct commit *commit)
                return EMPTY_TREE_SHA1_HEX;
 }
 
                return EMPTY_TREE_SHA1_HEX;
 }
 
+int index_has_changes(struct strbuf *sb)
+{
+       struct object_id head;
+       int i;
+
+       if (!get_oid_tree("HEAD", &head)) {
+               struct diff_options opt;
+
+               diff_setup(&opt);
+               DIFF_OPT_SET(&opt, EXIT_WITH_STATUS);
+               if (!sb)
+                       DIFF_OPT_SET(&opt, QUICK);
+               do_diff_cache(&head, &opt);
+               diffcore_std(&opt);
+               for (i = 0; sb && i < diff_queued_diff.nr; i++) {
+                       if (i)
+                               strbuf_addch(sb, ' ');
+                       strbuf_addstr(sb, diff_queued_diff.queue[i]->two->path);
+               }
+               diff_flush(&opt);
+               return DIFF_OPT_TST(&opt, HAS_CHANGES) != 0;
+       } else {
+               for (i = 0; sb && i < active_nr; i++) {
+                       if (i)
+                               strbuf_addch(sb, ' ');
+                       strbuf_addstr(sb, active_cache[i]->name);
+               }
+               return !!active_nr;
+       }
+}
+
 int try_merge_command(const char *strategy, size_t xopts_nr,
                      const char **xopts, struct commit_list *common,
                      const char *head_arg, struct commit_list *remotes)
 int try_merge_command(const char *strategy, size_t xopts_nr,
                      const char **xopts, struct commit_list *common,
                      const char *head_arg, struct commit_list *remotes)