[GUILT v4 26/33] "guilt pop" now fails when there are no more patches to pop.

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This is analogous to how "guilt push" now fails when there are no more
patches to push.  Like push, the "--all" argument still succeeds even
if there was no need to pop anything.

Updated the test suite.

Signed-off-by: Per Cederqvist <cederp@xxxxxxxxx>
Signed-off-by: Josef 'Jeff' Sipek <jeffpc@xxxxxxxxxxxxxx>
---
 guilt-pop            | 17 +++++++++++------
 regression/t-021.out |  2 ++
 regression/t-021.sh  |  6 ++++++
 regression/t-061.sh  |  6 +++++-
 4 files changed, 24 insertions(+), 7 deletions(-)

diff --git a/guilt-pop b/guilt-pop
index f0e647f..191313e 100755
--- a/guilt-pop
+++ b/guilt-pop
@@ -49,9 +49,19 @@ fi
 patch="$1"
 [ ! -z "$all" ] && patch="-a"
 
+# Treat "guilt pop" as "guilt pop -n 1".
+if [ -z "$patch" ]; then
+	patch=1
+	num=t
+fi
+
 if [ ! -s "$applied" ]; then
 	disp "No patches applied."
-	exit 0
+	if [ "$patch" = "-a" ]; then
+		exit 0
+	else
+		exit 1
+	fi
 elif [ "$patch" = "-a" ]; then
 	# we are supposed to pop all patches
 
@@ -68,11 +78,6 @@ elif [ ! -z "$num" ]; then
 	# catch underflow
 	[ $eidx -lt 0 ] && eidx=0
 	[ $eidx -eq $sidx ] && die "No patches requested to be removed."
-elif [ -z "$patch" ]; then
-	# we are supposed to pop only the current patch on the stack
-
-	sidx=`wc -l < "$applied"`
-	eidx=`expr $sidx - 1`
 else
 	# we're supposed to pop only up to a patch, make sure the patch is
 	# in the series
diff --git a/regression/t-021.out b/regression/t-021.out
index 9b42d9c..58be12f 100644
--- a/regression/t-021.out
+++ b/regression/t-021.out
@@ -287,6 +287,8 @@ index 0000000..8baef1b
 +++ b/def
 @@ -0,0 +1 @@
 +abc
+% guilt pop
+No patches applied.
 % guilt push --all
 Applying patch..modify
 Patch applied.
diff --git a/regression/t-021.sh b/regression/t-021.sh
index 614e870..e0d2dc1 100755
--- a/regression/t-021.sh
+++ b/regression/t-021.sh
@@ -23,6 +23,12 @@ guilt series | _tac | while read n ; do
 done
 
 #
+# pop when there is nothing to pop
+#
+
+shouldfail guilt pop
+
+#
 # push all
 #
 cmd guilt push --all
diff --git a/regression/t-061.sh b/regression/t-061.sh
index 1411baa..6192f1b 100755
--- a/regression/t-061.sh
+++ b/regression/t-061.sh
@@ -48,7 +48,11 @@ cmd list_files
 
 for i in `seq 5`
 do
-	cmd guilt pop
+	if [ $i -ge 5 ]; then
+		shouldfail guilt pop
+	else
+		cmd guilt pop
+	fi
 	cmd git for-each-ref
 	cmd guilt push
 	cmd git for-each-ref
-- 
1.8.3.1

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