wildmatch: make wildmatch's return value compatible with fnmatch

diff --git a/builtin/rev-parse.c b/builtin/rev-parse.c
index 13495b88f5da1efc2094c0e69abfe93605ee8c03..47b4e7adb956517c22edc580892d63a99d9f219a 100644 (file)
--- a/builtin/rev-parse.c
+++ b/builtin/rev-parse.c
@@ -224,6 +224,7 @@ static int try_difference(const char *arg)
        const char *next;
        const char *this;
        int symmetric;
+       static const char head_by_default[] = "HEAD";
 
        if (!(dotdot = strstr(arg, "..")))
                return 0;
@@ -235,9 +236,20 @@ static int try_difference(const char *arg)
        next += symmetric;
 
        if (!*next)
-               next = "HEAD";
+               next = head_by_default;
        if (dotdot == arg)
-               this = "HEAD";
+               this = head_by_default;
+
+       if (this == head_by_default && next == head_by_default &&
+           !symmetric) {
+               /*
+                * Just ".."?  That is not a range but the
+                * pathspec for the parent directory.
+                */
+               *dotdot = '.';
+               return 0;
+       }
+
        if (!get_sha1(this, sha1) && !get_sha1(next, end)) {
                show_rev(NORMAL, end, next);
                show_rev(symmetric ? NORMAL : REVERSED, sha1, this);