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

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 <redacted>
---
 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

Jeff,
   Did you not like the patch below for some reason ?
   It seemed fairly straightforward to me that guilt-pop and guilt-push
should exit failure if they did not do anything due to having nothing to
do.


On Mon, 29 Sep 2008, Scott Moser wrote:

On Fri, Oct 17, 2008 at 07:37:33AM -0400, Scott Moser wrote:

Jeff,
   Did you not like the patch below for some reason ?

I don't remember my train of thought, but I ended up making a simpler patch
to address the push-pushing-more-than-it-should bug. I completely missed the
part about the exit codes.

   It seemed fairly straightforward to me that guilt-pop and guilt-push
should exit failure if they did not do anything due to having nothing to
do.

I'd actually say that it's not obvious, but...see below :)

On Mon, 29 Sep 2008, Scott Moser wrote:

quoted

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

Who am I to argue against compatibility.

...

quoted

diff --git a/guilt-push b/guilt-push
index 018f9ac..48f886b 100755
--- a/guilt-push
+++ b/guilt-push

[snipped long diff]

With my fix, this should be a 2-liner :)

Sorry for missing the return code part...

Josef 'Jeff' Sipek.

-- 
We have joy, we have fun, we have Linux on a Sun...

On Fri, 17 Oct 2008, Josef 'Jeff' Sipek wrote:

On Fri, Oct 17, 2008 at 07:37:33AM -0400, Scott Moser wrote:

quoted

Jeff,
   Did you not like the patch below for some reason ?

I don't remember my train of thought, but I ended up making a simpler patch
to address the push-pushing-more-than-it-should bug. I completely missed the
part about the exit codes.

good enough. I hadn't pulled in a while and didn't realize you'd made a
change.  I never actually saw a problem with "pushing too much" , but
only in the exit codes.

quoted

quoted

diff --git a/guilt-push b/guilt-push
index 018f9ac..48f886b 100755
--- a/guilt-push
+++ b/guilt-push

[snipped long diff]

With my fix, this should be a 2-liner :)

for what its worth, the patch i sent only added a couple lines.  It
really just changed indentation.  So, the patch was long, only 2 new
lines that did anything.

anyway... I'm happy if you make it exit failure.

Thanks,