Merge branch 'maint'

* maint:
  Documentation: fix graph in git-rev-parse.txt
  show-branch --current: do not barf on detached HEAD

Documentation/git-rev-parse.txt

@@ -243,16 +243,18 @@ Here is an illustration, by Jon Loeliger.  Both commit nodes B
 and C are parents of commit node A.  Parent commits are ordered
 left-to-right.
 
-    G   H   I   J
-     \ /     \ /
-      D   E   F
-       \  |  / \ 
-        \ | /   |
-         \|/    |
-          B     C
-           \   /
-            \ /
-             A
+........................................
+G   H   I   J
+ \ /     \ /
+  D   E   F
+   \  |  / \
+    \ | /   |
+     \|/    |
+      B     C
+       \   /
+        \ /
+         A
+........................................
 
     A =      = A^0
     B = A^   = A^1     = A~1

builtin-show-branch.c

@@ -782,8 +782,8 @@ int cmd_show_branch(int ac, const char **av, const char *prefix)
 				has_head++;
 		}
 		if (!has_head) {
-			int pfxlen = strlen("refs/heads/");
-			append_one_rev(head + pfxlen);
+			int offset = !prefixcmp(head, "refs/heads/") ? 11 : 0;
+			append_one_rev(head + offset);
 		}
 	}