[PATCH] tg export: implement skipping empty patches for quilt mode

["Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>]

From: Uwe Kleine-König <ukleinek@strlen.de>

addionally fix the README item for skipping the export of empty patches
not to need an option (-n) as this should be the default.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 README       |    2 +-
 tg-export.sh |   12 ++++++++----
 2 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/README b/README
index 5bfe3ee..9b92d43 100644
--- a/README
+++ b/README
@@ -414,7 +414,7 @@ tg export
 	TODO: Make stripping of non-essential headers configurable
 	TODO: Make stripping of [PATCH] and other prefixes configurable
 	TODO: --mbox option for other mode of operation
-	TODO: -n option to prevent exporting of empty patches
+	TODO: prevent exporting of empty patches
 	TODO: -a option to export all branches
 	TODO: For quilt exporting, use a temporary branch and remove it when
 	      done - this would allow producing conflict-less series
diff --git a/tg-export.sh b/tg-export.sh
index 52af88d..f133fb8 100644
--- a/tg-export.sh
+++ b/tg-export.sh
@@ -140,10 +140,14 @@ quilt()
 		return
 	fi
 
-	echo "Exporting $_dep"
-	mkdir -p "$(dirname "$filename")"
-	$tg patch "$_dep" >"$filename"
-	echo "$_dep.diff -p1" >>"$output/series"
+	if branch_empty "$_dep"; then
+		echo "Skip empty patch $_dep";
+	else
+		echo "Exporting $_dep"
+		mkdir -p "$(dirname "$filename")"
+		$tg patch "$_dep" >"$filename"
+		echo "$_dep.diff -p1" >>"$output/series"
+	fi
 }
 
 
-- 
1.5.6.5