#!/bin/bash
# Copyright Cédric Picard 2014 -- License WTFPL
# Inspired by Ranger's -- See https://github.com/hut/ranger

set -e -u

if [ $# -ne 0 ] ; then
    { for i in "$@" ; do printf "%s\n" "$i" ; done } | "$0"
    exit
fi

EDITOR="${EDITOR:-vi}"

file=/tmp/blkrn-$$
cat > ${file}.1
exec </dev/tty >/dev/tty || { echo 'Interactive terminal needed' >&2; exit; }

cp ${file}.1 ${file}.2
"$EDITOR" ${file}.2

if [ $(wc -l < ${file}.1) -ne $(wc -l < ${file}.2) ] ; then
    rm ${file}.1 ${file}.2
    echo "Wrong number of lines" >&2
    exit 1
fi

sed -i "s/'/'\"'\"'/g" ${file}.1 ${file}.2

paste -d "\n" ${file}.1 ${file}.2  | while read -r input ; do
    read -r output

    if [ "$input" != "$output" ] ; then
        echo "mv -- '$input' '$output'"
    fi
done > ${file}.sh

if [ "$(stat --printf="%s" ${file}.sh)" -ne 0 ] ; then
    "$EDITOR" ${file}.sh
    sh ${file}.sh
fi

rm ${file}.1 ${file}.2 ${file}.sh