#! /usr/bin/env 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.

# Read in library functions
if [ "$(type -t patch_file_name)" != function ]
then
	if ! [ -r $QUILT_DIR/scripts/patchfns ]
	then
		echo "Cannot read library $QUILT_DIR/scripts/patchfns" >&2
		exit 1
	fi
	. $QUILT_DIR/scripts/patchfns
fi

usage()
{
	printf $"Usage: quilt rename [-P patch] new_name\n"
	if [ x$1 = x-h ]
	then
		printf $"
Rename the topmost or named patch.

-P patch
	Patch to rename.
"
		exit 0
	else
		exit 1
	fi
}

move_file()
{
	local old=$1 new=$2 newdir=$(dirname "$2")

	[ -d "$newdir" ] || mkdir -p "$newdir" || return 1
	mv "$old" "$new" || return 1
	rmdir -p "$(dirname "$old")" 2> /dev/null

	return 0
}

options=`getopt -o P:h -- "$@"`

if [ $? -ne 0 ]
then
	usage
fi

eval set -- "$options"

while true
do
	case "$1" in
	-P)
		opt_patch=$2
		shift 2 ;;
	-h)
		usage -h ;;
	--)
		shift
		break ;;
	esac
done

if [ $# -ne 1 ]
then
	usage
fi

patch=$(find_patch_in_series "$opt_patch") || exit 1

new_patch=${1#$QUILT_PATCHES/}

if patch_in_series "$new_patch" || \
   [ -d "$QUILT_PC/$new_patch" ] || \
   [ -e "$(patch_file_name "$new_patch")" ]
then
	printf $"Patch %s exists already, please choose a different name\n" \
	       "$(print_patch "$new_patch")" >&2
	exit 1
fi

if ( is_applied "$patch" && \
     ( ! rename_in_db "$patch" "$new_patch" || \
       ! move_file "$QUILT_PC/$patch" \
		   "$QUILT_PC/$new_patch" ) ) || \
   ! rename_in_series "$patch" "$new_patch" || \
   ( [ -e "$(patch_file_name "$patch")" ] && \
     ! move_file "$(patch_file_name "$patch")" \
		 "$(patch_file_name "$new_patch")" )
then
	printf $"Renaming of patch %s to %s failed\n" \
	       "$(print_patch "$patch")" \
	       "$(print_patch "$new_patch")" >&2
	exit 1
fi

printf $"Patch %s renamed to %s\n" \
       "$(print_patch "$patch")" \
       "$(print_patch "$new_patch")"