Libified diff-index: backward compatibility fix.

"diff-index -m" does not mean "do not ignore merges", but means
"pretend missing files match the index".

The previous round tried to address this, but failed because
setup_revisions() ate "-m" flag before the caller had a chance
to intervene.

Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/diff-index.c b/diff-index.c
index 4a243b3..8694012 100644 (file)
--- a/diff-index.c
+++ b/diff-index.c
@@ -23,9 +23,7 @@ int main(int argc, const char **argv)
        for (i = 1; i < argc; i++) {
                const char *arg = argv[i];
                        
-               if (!strcmp(arg, "-m"))
-                       match_missing = 1; 
-               else if (!strcmp(arg, "--cached"))
+               if (!strcmp(arg, "--cached"))
                        cached = 1;
                else
                        usage(diff_cache_usage);
@@ -37,5 +35,5 @@ int main(int argc, const char **argv)
        if (!rev.pending_objects || rev.pending_objects->next ||
            rev.max_count != -1 || rev.min_age != -1 || rev.max_age != -1)
                usage(diff_cache_usage);
-       return run_diff_index(&rev, cached, match_missing);
+       return run_diff_index(&rev, cached);
 }

diff --git a/diff-lib.c b/diff-lib.c
index 63da3b5..2183b41 100644 (file)
--- a/diff-lib.c
+++ b/diff-lib.c
@@ -308,12 +308,20 @@ static void mark_merge_entries(void)
        }
 }
 
-int run_diff_index(struct rev_info *revs, int cached, int match_missing)
+int run_diff_index(struct rev_info *revs, int cached)
 {
        int ret;
        struct object *ent;
        struct tree *tree;
        const char *tree_name;
+       int match_missing = 0;
+
+       /* 
+        * Backward compatibility wart - "diff-index -m" does
+        * not mean "do not ignore merges", but totally different.
+        */
+       if (!revs->ignore_merges)
+               match_missing = 1;
 
        if (read_cache() < 0) {
                perror("read_cache");

diff --git a/diff.h b/diff.h
index 837d449..7150b90 100644 (file)
--- a/diff.h
+++ b/diff.h
@@ -171,6 +171,6 @@ extern const char *diff_unique_abbrev(const unsigned char *, int);
 
 extern int run_diff_files(struct rev_info *revs, int silent_on_removed);
 
-extern int run_diff_index(struct rev_info *revs, int cached, int match_missing);
+extern int run_diff_index(struct rev_info *revs, int cached);
 
 #endif /* DIFF_H */