Extend index to save more flags

diff --git a/builtin-diff.c b/builtin-diff.c
index 037c3039a43d198f228fbc64e46d85d4170c1329..9c8c295732bf12990b8324bf75968fd68dd41d59 100644 (file)
--- a/builtin-diff.c
+++ b/builtin-diff.c
@@ -74,6 +74,8 @@ static int builtin_diff_b_f(struct rev_info *revs,
        if (!(S_ISREG(st.st_mode) || S_ISLNK(st.st_mode)))
                die("'%s': not a regular file or symlink", path);
 
+       diff_set_mnemonic_prefix(&revs->diffopt, "o/", "w/");
+
        if (blob[0].mode == S_IFINVALID)
                blob[0].mode = canon_mode(st.st_mode);
 
@@ -175,10 +177,8 @@ static int builtin_diff_combined(struct rev_info *revs,
        if (!revs->dense_combined_merges && !revs->combine_merges)
                revs->dense_combined_merges = revs->combine_merges = 1;
        parent = xmalloc(ents * sizeof(*parent));
-       /* Again, the revs are all reverse */
        for (i = 0; i < ents; i++)
-               hashcpy((unsigned char *)(parent + i),
-                       ent[ents - 1 - i].item->sha1);
+               hashcpy((unsigned char *)(parent + i), ent[i].item->sha1);
        diff_tree_combined(parent[0], parent + 1, ents - 1,
                           revs->dense_combined_merges, revs);
        return 0;
@@ -223,7 +223,13 @@ static int builtin_diff_files(struct rev_info *revs, int argc, const char **argv
                argv++; argc--;
        }
 
-       if (revs->max_count == -1 &&
+       /*
+        * "diff --base" should not combine merges because it was not
+        * asked to.  "diff -c" should not densify (if the user wants
+        * dense one, --cc can be explicitly asked for, or just rely
+        * on the default).
+        */
+       if (revs->max_count == -1 && !revs->combine_merges &&
            (revs->diffopt.output_format & DIFF_FORMAT_PATCH))
                revs->combine_merges = revs->dense_combined_merges = 1;