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#!/usr/bin/env bash
# Copyright (c) 2016 Egor Tensin <Egor.Tensin@gmail.com>
# This file is part of the "Linux/Cygwin environment" project.
# For details, see https://github.com/egor-tensin/linux-home.
# Distributed under the MIT License.
swap_files() (
set -o errexit -o nounset -o pipefail
if [ "$#" -ne 2 ]; then
echo "usage: ${FUNCNAME[0]} PATH1 PATH2" >&2
return 1
fi
local path1="$1"
local path2="$2"
if [ ! -r "$path1" ] || [ ! -w "$path1" ]; then
echo "${FUNCNAME[0]}: must be readable and writable: $path1" >&2
return 1
fi
if [ ! -r "$path2" ] || [ ! -w "$path2" ]; then
echo "${FUNCNAME[0]}: must be readable and writable: $path2" >&2
return 1
fi
local path1_dir
path1_dir="$( dirname -- "$path1" )"
local tmp_path
tmp_path="$( mktemp -- "$path1_dir/XXX" )"
mv -- "$path1" "$tmp_path"
mv -- "$path2" "$path1"
mv -- "$tmp_path" "$path2"
)
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