#!/bin/bash
# Copyright Cédric Picard 2014 -- License WTFPL
# Inspired by Ranger's -- See https://github.com/hut/ranger
#
# Code shuffled around by Leonardo Eugênio 2020

set -e -u

end(){
    rm -r -- "$(dirname -- "${namebase}")"
    [ $# -ne 0 ] && echo $@ >&2
    exit $#
}

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

EDITOR="${EDITOR:-vi}"

namebase="$(mktemp -d)/blkrn"
echo '# Modify filenames without removing any line, quitting aborts' \
    > "${namebase}.2"
tee -- "${namebase}.1" >> "${namebase}.2"
exec </dev/tty >/dev/tty ||
    end 'Interactive terminal needed'

"$EDITOR" -- "${namebase}.2"
sed -i -- '1d' "${namebase}.2"

! diff -- "${namebase}.1" "${namebase}.2" &> /dev/null || end "no changes"
[ `wc -l < "${namebase}.1"` -eq `wc -l < "${namebase}.2"` ] || end "Wrong number of lines"

{
    echo '# Please review/modify this script or empty it to do nothing'
    echo 'run(){'
    echo '    mkdir -p "$(dirname "$2")"'
    echo '    mv -T -- "$1" "$2"'
    echo '}'
    while read -r l1 <&3 && read -r l2 <&4; do
        [ "$l1" = "$l2" ] || printf "%s\n%s\n" "$l1" "$l2"
    done 3<"${namebase}.1" 4<"${namebase}.2" |
    sed 's/\([\\"$`]\)/\\\1/g;s/^.*$/"&"/' |
    xargs -d"\n" -L2 echo 'run'
} > "${namebase}.sh"

"$EDITOR" -- "${namebase}.sh"
sh -e -- "${namebase}.sh"

end # exit normaly