provide a nice @{...} syntax to always mean the current branch reflog

This is shorter than HEAD@{...} and being nameless it has no semantic
issues.

Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/sha1_name.c b/sha1_name.c
index 70c6e42b04c163474b56de7df6c93a038922c600..de8caf8cf6c81480f3e93edc5e3b4582a319a479 100644 (file)
--- a/sha1_name.c
+++ b/sha1_name.c
@@ -279,7 +279,7 @@ static int get_sha1_basic(const char *str, int len, unsigned char *sha1)
        /* basic@{time or number} format to query ref-log */
        reflog_len = at = 0;
        if (str[len-1] == '}') {
-               for (at = 1; at < len - 1; at++) {
+               for (at = 0; at < len - 1; at++) {
                        if (str[at] == '@' && str[at+1] == '{') {
                                reflog_len = (len-1) - (at+2);
                                len = at;
@@ -289,10 +289,14 @@ static int get_sha1_basic(const char *str, int len, unsigned char *sha1)
        }
 
        /* Accept only unambiguous ref paths. */
-       if (ambiguous_path(str, len))
+       if (len && ambiguous_path(str, len))
                return -1;
 
-       refs_found = dwim_ref(str, len, sha1, &real_ref);
+       if (!len && reflog_len) {
+               /* allow "@{...}" to mean the current branch reflog */
+               refs_found = dwim_ref("HEAD", 4, sha1, &real_ref);
+       } else
+               refs_found = dwim_ref(str, len, sha1, &real_ref);
 
        if (!refs_found)
                return -1;
@@ -312,11 +316,12 @@ static int get_sha1_basic(const char *str, int len, unsigned char *sha1)
                 * In the mean time prevent people from getting used to
                 * such a synonym until the work is completed.
                 */
-               if (!strncmp("HEAD", str, len) &&
+               if (len && !strncmp("HEAD", str, len) &&
                    !strncmp(real_ref, "refs/", 5)) {
                        error("reflog for HEAD has not been implemented yet\n"
-                             "Maybe you could try %s%s instead.",
-                             strchr(real_ref+5, '/')+1, str + len);
+                             "Maybe you could try %s%s instead, "
+                             "or just %s for current branch..",
+                             strchr(real_ref+5, '/')+1, str+len, str+len);
                        exit(-1);
                }