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

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

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Cc: martin f. krafft <madduck@debian.org>
Cc: Petr Baudis <pasky@suse.cz>
---
 tg-export.sh |   18 ++++++++++++++----
 1 files changed, 14 insertions(+), 4 deletions(-)

diff --git a/tg-export.sh b/tg-export.sh
index 52af88d..6f1d226 100644
--- a/tg-export.sh
+++ b/tg-export.sh
@@ -7,6 +7,7 @@ name=
 branches=
 output=
 driver=collapse
+skipempty=false
 
 
 ## Parse options
@@ -20,6 +21,8 @@ while [ -n "$1" ]; do
 		driver=quilt;;
 	--collapse)
 		driver=collapse;;
+	-n)
+		skipempty=true;;
 	-*)
 		echo "Usage: tg [...] export ([--collapse] NEWBRANCH | [-b BRANCH1,BRANCH2...] --quilt DIRECTORY)" >&2
 		exit 1;;
@@ -34,6 +37,9 @@ done
 [ -z "$branches" -o "$driver" = "quilt" ] ||
 	die "-b works only with the quilt driver"
 
+! "$skipempty" || [ "$driver" = "quilt" ] ||
+	die "-n is only implemented for the quilt driver"
+
 if [ -z "$branches" ]; then
 	# this check is only needed when no branches have been passed
 	name="$(git symbolic-ref HEAD | sed 's#^refs/heads/##')"
@@ -140,10 +146,14 @@ quilt()
 		return
 	fi
 
-	echo "Exporting $_dep"
-	mkdir -p "$(dirname "$filename")"
-	$tg patch "$_dep" >"$filename"
-	echo "$_dep.diff -p1" >>"$output/series"
+	if "$skipempty" && 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