Re: [GUILT 25/28] "guilt push" now fails when there are no more patches to push.

This makes it easier to script operations on the entire queue, for
example run the test suite on each patch in the queue:

    guilt pop -a;while guilt push; do make test||break; done

This brings "guilt push" in line with the push operation in Mercurial
Queues (hg qpush), which fails when there are no patches to apply.

Updated the test suite.

"guilt push -a" still does not fail.  (It successfully manages to
ensure that all patches are pushed, even if it did not have to do
anything to make it so.)

Signed-off-by: Per Cederqvist <redacted>
---
 guilt-push           | 14 ++++-----
 regression/t-020.out | 89 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 regression/t-020.sh  | 13 +++++++-
 3 files changed, 108 insertions(+), 8 deletions(-)

diff --git a/guilt-push b/guilt-push
index 67687e7..2222350 100755
--- a/guilt-push
+++ b/guilt-push

@@ -55,6 +55,7 @@ fi
 
 patch="$1"
 [ ! -z "$all" ] && patch="-a"
+[ -z "$patch" ] && { patch=1; num=t; }

@@ -78,11 +79,6 @@ elif [ ! -z "$num" ]; then
 	# clamp to minimum
 	[ $tidx -lt $eidx ] && eidx=$tidx
 
-elif [ -z "$patch" ]; then
-	# we are supposed to push only the next patch onto the stack
-
-	eidx=`wc -l < "$applied"`
-	eidx=`expr $eidx + 1`
 else
 	# we're supposed to push only up to a patch, make sure the patch is
 	# in the series

@@ -109,7 +105,11 @@ if [ "$sidx" -gt "$eidx" ]; then
 	else
 		disp "File series fully applied, ends at patch `get_series | tail -n 1`"
 	fi
-	exit 0
+	if [ -n "$all" ]; then
+		exit 0
+	else
+		exit 1
+	fi