#! /bin/sh

# Last updated: 20090622

patchfile=$1

if [ -z "$patchfile" -o ! -f $patchfile ]; then
	echo "usage: ${0##*/} <file>"
	exit 1
fi

login=$USER

checkoutfile=${patchfile%%.diff}.checkout
commitfile=${patchfile%%.diff}.commit

echo_co() { echo $* >> $checkoutfile; }
echo_ci() { echo $* >> $commitfile; }

echo "#! /bin/sh" > $checkoutfile
echo "#! /bin/sh" > $commitfile

chmod 755 $checkoutfile
chmod 755 $commitfile

# Get the list of all changes files.
minus=`grep -- "^--- " $patchfile | sed '/\/dev\/null/d;s|^--- ||;s|[ab]/||;s|	.*||'`
plus=`grep -- "^+++ " $patchfile | sed '/\/dev\/null/d;s|^+++ ||;s|[ab]/||;s|	.*||'`
checkout=`echo $minus $plus | tr ' ' '\n' | sed -E 's|/[^/]+$||;s|^(ports/)?|ports/|' | sort -u`

if [ -n "$checkout" ]; then
	echo_co
	echo_co "# Checkout a few directories."
	for i in $checkout; do
		echo_co "cvs -d $login@pcvs.FreeBSD.org:/home/pcvs checkout -l $i"
	done
fi

# Find deleted files.

deleted=`grep -B 1 -- "^+++ /dev/null" $patchfile | grep -- "^--- " | sed 's|[ab]/||;s|^--- ||;s|	.*||'`

if [ -n "$deleted" ]; then
	echo_ci
	echo_ci "# Removed files."
	echo_ci "cvs -d $login@pcvs.FreeBSD.org:/home/pcvs rm $deleted" | tr '\n' ' '
	echo_ci
fi

# Find new files.

added=`grep -A 1 -- "^--- /dev/null" $patchfile | grep -- "^+++ " | sed 's|[ab]/||;s|^+++ ||;s|	.*||'`
newdirs=`echo $added | tr ' ' '\n' | sed -E 's|/[^/]+$||' | sort -u`

if [ -n "$newdirs" ]; then
	echo_ci "# Possible new directories."
	for i in $newdirs; do
		echo_ci "cvs -d $login@pcvs.FreeBSD.org:/home/pcvs add $i"
	done
	echo_ci
fi

if [ -n "$added" ]; then
	echo_ci "# New files."
	echo_ci "cvs -d $login@pcvs.FreeBSD.org:/home/pcvs add $added" | tr '\n' ' '
	echo_ci
fi

if [ -n "$plus" -o -n "$minus" ]; then
	echo_ci "# Let's go!"
	echo_ci "cvs -d $login@pcvs.FreeBSD.org:/home/pcvs ci $plus $minus" | tr '\n' ' '
fi

echo "I've generated two shell scripts for you. Typical use case is:"
echo ""
echo "    $ ./$checkoutfile"
echo "    $ cd ports && patch -s -E -p0 < ../$patchfile"
echo "    $ ../$commitfile"
echo ""