#!/bin/bash
# A new mover.
# Created by Kim Johansson
# Released under GNU GPL v2.0

# Set this files name.
NAME="renamer"

# Check if we have more than two arguments.
# -z is to check if a string is empty. With ! before it's negated, if the string is not empty.
if [ ! -z $3 ]
	then
	echo -e "Usage: $NAME file1 file2"
# Proper exit status if something went wrong.
	exit 1
fi

DONE="no"
while [ "$DONE" != "yes" ]
do
	if [ -z $1 ]
		then
		echo -e -n "File to rename: "
		read FILE_TO_RENAME
		if [ -e $FILE_TO_RENAME ]
			then DONE="yes"
		else
			echo -e "File does not exist."
		fi
	else
		FILE_TO_RENAME=$1
		if [ ! -e $FILE_TO_RENAME ]
			then
			echo -e "File does not exists."
			exit 1
		else
			DONE="yes"
		fi
	fi
done

DONE="no"
while [ "$DONE" != "yes" ]
do
	if [ -z $2 ]
		then
		echo -e -n "New name: "
		read NEW_NAME
		if [ ! -e $NEW_NAME ]
			then DONE="yes"
		else
			echo -e "File exists."
		fi
	else
		NEW_NAME=$2
		if [ ! -e $NEW_NAME ]
			then DONE="yes"
		else
			echo -e "File exists."
			exit 1
		fi
	fi
done

# Finally, use the mv command to rename the file.
mv $FILE_TO_RENAME $NEW_NAME
# Proper exit status.
exit 0