#!/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}"

namebase="$(mktemp -d)/blkrn"
cat > "${namebase}.1"
exec </dev/tty >/dev/tty || { echo 'Interactive terminal needed' >&2; exit; }

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

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

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

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

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

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

rm -r "$(dirname "${namebase}")"