#!/bin/bash

# Rename files by editing their filenames with $EDITOR
# Not robust against filenames with newlines

# Todo: Run this through tsort to make simultaenous moves a -> b , b -> c safe.

OLDNAMES="$(mktemp)"
NEWNAMES="$(mktemp)"

if (( $# > 0 ))
 then ls -di "$@"
 else ls -i
fi | sed 's/^ *//' | tee "$NEWNAMES" > "$OLDNAMES"

$EDITOR "$NEWNAMES"

while read inode newname;do
	oldline="$(grep "^$inode " "$OLDNAMES")"
	oldname="${oldline#* }"
	if [[ "$oldname" != "$newname" && ! -e "$newname" ]];then
		mv -v "$oldname" "$newname"
	fi
done < "$NEWNAMES"

rm "$OLDNAMES" "$NEWNAMES"