[PATCH 2/3] for-each-ref: introduce %(HEAD) marker

[Ramkumar Ramachandra <artagnon@gmail.com>]

'git branch' shows which branch you are currently on with an '*', but
'git for-each-ref' misses this feature.  So, extend the format with
%(HEAD) to do exactly the same thing.

Now you can use the following format in for-each-ref:

  %C(red)%(HEAD)%C(reset) %C(green)%(refname:short)%C(reset)

to display a red asterisk next to the current ref.

Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>
---
 builtin/for-each-ref.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/builtin/for-each-ref.c b/builtin/for-each-ref.c
index 1563b25..63d3a85 100644
--- a/builtin/for-each-ref.c
+++ b/builtin/for-each-ref.c
@@ -76,6 +76,7 @@ static struct {
 	{ "upstream" },
 	{ "symref" },
 	{ "flag" },
+	{ "HEAD" },
 };
 
 /*
@@ -683,8 +684,16 @@ static void populate_value(struct refinfo *ref)
 				v->s = xstrdup(buf + 1);
 			}
 			continue;
-		}
-		else
+		} else if (!strcmp(name, "HEAD")) {
+			const char *head;
+			unsigned char sha1[20];
+			head = resolve_ref_unsafe("HEAD", sha1, 1, NULL);
+			if (!strcmp(ref->refname, head))
+				v->s = "*";
+			else
+				v->s = " ";
+			continue;
+		} else
 			continue;
 
 		formatp = strchr(name, ':');
-- 
1.8.3.rc3.2.g99b8f3f.dirty