combine-diff: diff-files fix.

When showing a conflicted merge from index stages and working
tree file, we did not fetch the mode from the working tree,
and mistook that as a deleted file.  Also if the manual
resolution (or automated resolution by git rerere) ended up
taking either parent's version, we did not show _anything_ for
that path.  Either was quite bad and confusing.

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

diff --git a/combine-diff.c b/combine-diff.c
index a38f01b..d812600 100644 (file)
--- a/combine-diff.c
+++ b/combine-diff.c
@@ -630,9 +630,10 @@ static int show_patch_diff(struct combine_diff_path *elem, int num_parent,
        int i, show_hunks, shown_header = 0;
        char ourtmp_buf[TMPPATHLEN];
        char *ourtmp = ourtmp_buf;
+       int working_tree_file = !memcmp(elem->sha1, null_sha1, 20);
 
        /* Read the result of merge first */
-       if (memcmp(elem->sha1, null_sha1, 20)) {
+       if (!working_tree_file) {
                result = grab_blob(elem->sha1, &size);
                write_to_temp_file(ourtmp, result, size);
        }
@@ -646,6 +647,7 @@ static int show_patch_diff(struct combine_diff_path *elem, int num_parent,
                        int len = st.st_size;
                        int cnt = 0;
 
+                       elem->mode = DIFF_FILE_CANON_MODE(st.st_mode);
                        size = len;
                        result = xmalloc(len + 1);
                        while (cnt < len) {
@@ -661,6 +663,7 @@ static int show_patch_diff(struct combine_diff_path *elem, int num_parent,
                else {
                        /* deleted file */
                        size = 0;
+                       elem->mode = 0;
                        result = xmalloc(1);
                        result[0] = 0;
                        ourtmp = "/dev/null";
@@ -716,7 +719,7 @@ static int show_patch_diff(struct combine_diff_path *elem, int num_parent,
 
        show_hunks = make_hunks(sline, cnt, num_parent, dense);
 
-       if (show_hunks || mode_differs) {
+       if (show_hunks || mode_differs || working_tree_file) {
                const char *abb;
 
                if (header) {
@@ -731,8 +734,6 @@ static int show_patch_diff(struct combine_diff_path *elem, int num_parent,
                putchar('\n');
                printf("index ");
                for (i = 0; i < num_parent; i++) {
-                       if (elem->parent[i].mode != elem->mode)
-                               mode_differs = 1;
                        abb = find_unique_abbrev(elem->parent[i].sha1,
                                                 DEFAULT_ABBREV);
                        printf("%s%s", i ? "," : "", abb);