[RFC/PATCH] show tracking branches with their associated branch names

The "git branch" command, by default, displays the local branches. There
is no visual distinction made between the tracking branches and normal
local branches. This patch enables the "git branch" to display
tracking info for tracking branches:

Before this patch:
  $ git branch
  * master
    local

After this patch:
  $ git branch
  * master [origin/master]
    local

Signed-off-by: Santhosh Kumar Mani <redacted>
---
 builtin/branch.c |   16 ++++++++++++++++
 1 files changed, 16 insertions(+), 0 deletions(-)

diff --git a/builtin/branch.c b/builtin/branch.c
index e1e486e..4841416 100644
--- a/builtin/branch.c
+++ b/builtin/branch.c

@@ -373,6 +373,19 @@ static int ref_cmp(const void *r1, const void *r2)
 	return strcmp(c1->name, c2->name);
 }
 
+static int get_tracking_branch_name(struct strbuf *name, const char

*branch_name)
+{
+	struct branch *branch = branch_get(branch_name);
+
+	if (branch && branch->merge && branch->merge[0]->dst) {
+		strbuf_addf(name, " [%s]",
+				shorten_unambiguous_ref(branch->merge[0]->dst, 0));
+		return 1;
+	}
+
+	return 0;
+}
+
 static void fill_tracking_info(struct strbuf *stat, const char
*branch_name,
 		int show_upstream_ref)
 {

@@ -475,6 +488,9 @@ static void print_ref_item(struct ref_item *item,

int maxwidth, int verbose,
 	else if (verbose)
 		/* " f7c0c00 [ahead 58, behind 197] vcs-svn: drop obj_pool.h" */
 		add_verbose_info(&out, item, verbose, abbrev);
+	else if (get_tracking_branch_name(&out, item->name))
+		;
+
 	printf("%s\n", out.buf);
 	strbuf_release(&name);
 	strbuf_release(&out);
-- 
1.7.0.4