#!/bin/bash

help() {
	echo "Usage: $0 <pkg-name> <priority>"
	echo "       $0 <pkg-name> -before <pkg-name>"
	echo "       $0 <pkg-name> -after <pkg-name>"
	exit 1
}

setpkg="$1"
shift

case "$1" in
	-before)
		read dummy1 dummy2 dummy3 masterpri < <( grep '^\[P\]' package/*/$2/$2.desc; )
		setpri=`perl -e "printf('%07.3f', $masterpri - 0.001)"`
		shift; shift
		;;
	-after)
		read dummy1 dummy2 dummy3 masterpri < <( grep '^\[P\]' package/*/$2/$2.desc; )
		setpri=`perl -e "printf('%07.3f', $masterpri + 0.001)"`
		shift; shift
		;;
	*)
		masterpri="$1"
		setpri="$1"
		shift
		;;
esac

if [ -z "$setpkg" -o -z "$setpri" -o -z "$masterpri" -o ! -f package/*/$setpkg/$setpkg.desc ]; then
	help
fi

tempfile=`mktemp`
cp package/*/$setpkg/$setpkg.desc $tempfile
sed -i "s,^\(\[P\].*\) [0-9.]*,\1 $setpri," $tempfile
diff -u ./package/*/$setpkg/$setpkg.desc $tempfile
rm -f $tempfile