[PATCH] fix guilt-pop and push to fail if no relevant patches

[Scott Moser <smoser@brickies.net>]

currently guilt-pop and guilt-push will exit with '0' if there are no more
relevant patches in the series (ie, if you've pushed or popped all of them)

This means that you cannot do something like:
  while guilt-push; do
    guilt refresh || break
  done

for reference, quilt does exit with non-zero in those cases:
  $ quilt push -a && quilt push
  File series fully applied, ends at patch my.patch
  $ echo $?
  1

  $ quilt pop -a; quilt pop
  No patch removed
  $ echo $?
  2

Signed-off-by: Scott Moser <smoser@brickies.net>
---
 guilt-pop            |    3 +--
 guilt-push           |   43 ++++++++++++++++++++++++-------------------
 regression/t-021.out |    3 +++
 3 files changed, 28 insertions(+), 21 deletions(-)

diff --git a/guilt-pop b/guilt-pop
index db8473e..8a83fdb 100755
--- a/guilt-pop
+++ b/guilt-pop
@@ -45,8 +45,7 @@ patch="$1"
 [ ! -z "$all" ] && patch="-a"
 
 if [ ! -s "$applied" ]; then
-	disp "No patches applied."
-	exit 0
+	die "No patches applied."
 elif [ "$patch" = "-a" ]; then
 	# we are supposed to pop all patches
 
diff --git a/guilt-push b/guilt-push
index 018f9ac..48f886b 100755
--- a/guilt-push
+++ b/guilt-push
@@ -97,22 +97,27 @@ fi
 sidx=`wc -l < $applied`
 sidx=`expr $sidx + 1`
 
-get_series | sed -n -e "${sidx},${eidx}p" | while read p
-do
-	disp "Applying patch..$p"
-	if [ ! -f "$GUILT_DIR/$branch/$p" ]; then
-		die "Patch $p does not exist. Aborting."
-	fi
-
-	push_patch "$p" $abort_flag
-
-	# bail if necessary
-	if [ $? -eq 0 ]; then
-		disp "Patch applied."
-	elif [ -z "$abort_flag" ]; then
-		die "Patch applied with rejects. Fix it up, and refresh."
-	else
-		die "To force apply this patch, use 'guilt push -f'"
-	fi
-done
-
+get_series | sed -n -e "${sidx},${eidx}p" |
+	{
+	did_patch=0
+	while read p
+	do
+		disp "Applying patch..$p"
+		if [ ! -f "$GUILT_DIR/$branch/$p" ]; then
+			die "Patch $p does not exist. Aborting."
+		fi
+
+		push_patch "$p" $abort_flag
+
+		# bail if necessary
+		if [ $? -eq 0 ]; then
+			disp "Patch applied."
+		elif [ -z "$abort_flag" ]; then
+			die "Patch applied with rejects. Fix it up, and refresh."
+		else
+			die "To force apply this patch, use 'guilt push -f'"
+		fi
+		did_patch=1
+	done
+	[ $did_patch -ge 1 ] || die "no patches to apply"
+	}
diff --git a/regression/t-021.out b/regression/t-021.out
index cd8ae96..44771cb 100644
--- a/regression/t-021.out
+++ b/regression/t-021.out
@@ -822,6 +822,7 @@ index 0000000..8baef1b
 @@ -0,0 +1 @@
 +abc
 % guilt-push --all
+no patches to apply
 % guilt-pop -n -1
 Invalid number of patches to pop.
 % list_files
@@ -908,6 +909,7 @@ index 0000000..8baef1b
 @@ -0,0 +1 @@
 +abc
 % guilt-push --all
+no patches to apply
 % guilt-pop -n 0
 No patches requested to be removed.
 % list_files
@@ -994,6 +996,7 @@ index 0000000..8baef1b
 @@ -0,0 +1 @@
 +abc
 % guilt-push --all
+no patches to apply
 % guilt-pop -n 1
 Now at remove.
 % list_files
-- 
1.5.6.3