patch: reapply path limit

This was originally applied added in commit eac1b67 (ui-patch: Apply
path limit to generated patch, 2010-06-10) but the ability to limit
patches to particular paths was lost in commit 455b598 (ui-patch.c: Use
log_tree_commit() to generate diffs, 2013-08-20).

The new output is slightly different from the original because Git's
diff infrastructure doesn't give us a way to insert an annotation
immediately after the "---" separator, so the commit has moved below the
diff stat.

Signed-off-by: John Keeping <john@keeping.me.uk>

diff --git a/ui-patch.c b/ui-patch.c
index fd6316b56b850e79ec48f5e22fc9417f0a7df03f..ec7f352340d478bdb11adbde8dc2a9f4462e3f42 100644 (file)
--- a/ui-patch.c
+++ b/ui-patch.c
@@ -18,9 +18,13 @@ void cgit_print_patch(const char *new_rev, const char *old_rev,
        struct commit *commit;
        struct object_id new_rev_oid, old_rev_oid;
        char rev_range[2 * 40 + 3];
-       char *rev_argv[] = { NULL, "--reverse", "--format=email", rev_range };
+       const char *rev_argv[] = { NULL, "--reverse", "--format=email", rev_range, "--", prefix };
+       int rev_argc = ARRAY_SIZE(rev_argv);
        char *patchname;
 
+       if (!prefix)
+               rev_argc--;
+
        if (!new_rev)
                new_rev = ctx.qry.head;
 
@@ -79,7 +83,9 @@ void cgit_print_patch(const char *new_rev, const char *old_rev,
        rev.max_parents = 1;
        rev.diffopt.output_format |= DIFF_FORMAT_DIFFSTAT |
                        DIFF_FORMAT_PATCH | DIFF_FORMAT_SUMMARY;
-       setup_revisions(ARRAY_SIZE(rev_argv), (const char **)rev_argv, &rev,
+       if (prefix)
+               rev.diffopt.stat_sep = fmt("(limited to '%s')\n\n", prefix);
+       setup_revisions(ARRAY_SIZE(rev_argv), rev_argv, &rev,
                        NULL);
        prepare_revision_walk(&rev);