#!/bin/sh
temp=$(mktemp)
ls > $temp
nvim $temp
results=$(ls | paste -d'|' - $temp)
IFS="
"
for i in $results; do
before="${i%%|*}"
after="${i#*|}"
[ "$before" != "$after" ] && mv "$before" "$after"
printf "%s -> %s\n" "$before" "$after"
done