#! /bin/bash

#  This script is free software; you can redistribute it and/or modify
#  it under the terms of the GNU General Public License version 2 as
#  published by the Free Software Foundation.
#
#  See the COPYING and AUTHORS files for more details.

if ! [ -r @LIB@/patchfns ]
then
	echo "Cannot read library @LIB@/patchfns" >&2
	exit 1
fi
. @LIB@/patchfns

usage()
{
	echo "Usage: apatch [-fq] patchname"
	exit 1
}

interrupt()
{
	local pc_file=$(pc_file_name $1)
	@LIB@/backup-files -s -f $pc_file -B .pc/$patch/ -r
	echo "apatch interrupted by user"
	exit 1
}

apply_patch()
{
	local patch=$(stripit $1)
	local pc_file=$(pc_file_name $patch)
	local patch_file=$(patch_file_name $patch)
	local file status

	if ! [ -e "$patch_file" ]
	then
		echo "No patch named $patch found."
		return 1
	fi

	#if is_applied "$patch"
	#then
	#	echo "$patch" is already applied
	#	return 1
	#fi

	trap "" SIGINT
	refresh_file_list $patch
	status=$?
	if [ $status -eq 2 ]
	then
		[ -z "$opt_quiet" ] && echo "Recreated file list for $patch"
	elif [ $status -ne 0 ]
	then
		return 1
	fi

	if ! @LIB@/backup-files -s -f $pc_file -B .pc/$patch/
	then
		exit 1
	fi
	
	trap "interrupt $patch" SIGINT
	# (patch -b fails if a file appears more than once in a patch!)
	#patch $(patch_args $patch) --no-backup-if-mismatch \
	#	-E $silent -i $patch_file
	patch $(patch_args $patch) --no-backup-if-mismatch \
		-E $silent -i $patch_file
	status=$?
	trap "" SIGINT

	# Remember date/time of applying so that poppatch can
	# avoid reverse applying the patch in the usual cases.
	touch $pc_file

	if [ $status -eq 0 -o -n "$opt_force" ]
	then
		add_to_db $patch
		if [ $status -eq 0 ]
		then
			echo "Applied $patch"
			rm -f $(pc_file_name $patch)~forced
		else
			touch $(pc_file_name $patch)~forced
			echo "Applied $patch (forced; needs refpatch)"
		fi
	else
		@LIB@/backup-files -s -f $pc_file -B .pc/$patch/ -r
		echo "Patch $patch does not apply"
	fi
	trap - SIGINT
	return $status
}

options=`getopt -o fqh -- "$@"`

if [ $? -ne 0 ]
then
	usage
fi

eval set -- "$options"

while true
do
	case "$1" in
	-f)
		opt_force=1
		shift ;;
	-q)
		opt_quiet=1
		shift ;;
	-h)
		usage -h ;;
	--)
		shift
		break ;;
	esac
done

if [ $# -ne 1 ]
then
	usage
fi

[ -n "$opt_quiet" ] && silent=-s

patch=$(stripit $1)

top=$(top_patch)
if [ -n "$top" -a -e $(pc_file_name $top)~forced ]
then
	echo "The topmost patch $top was force applied. Please run" \
	     "refpatch before applying other patches."
	exit 1
fi

apply_patch $patch