#! /bin/bash
#
# viname - rename files using vi ;-)
# $Id: viname,v 1.9 2004/07/19 14:41:17 hotti Exp $
#
# Copyright (c) Daniel Hottinger <hodaniel@student.ethz.ch>
# Released under the terms of the GNU General Public License v2 or later
#
# Created: Mon Jul 23 15:25:08 CEST 2001
# Last change: Fri Nov 04 19:43:56 PDT 2011
# Todo:
#   - rmdir -p old, empty directorys (ask user!)
#   - " foo.txt" -> read name -> "foo.txt"
# Changes:
#   [2004-06-17] back to /bin/sh. wrote better code
#   [2002-12-28] this is actually a bash-script
#   [2002-03-23] use /usr/bin/vi if $EDITOR is not set

set -e

EXT="$PPID.$$"
OLD=$(mktemp || echo /tmp/viname.$EXT.old)
NEW=$(mktemp || echo /tmp/viname.$EXT.new)

error() {
    echo "interrupt" >&2
    exit 1
}

sig_exit() {
    rm $OLD $NEW
}

trap "error" HUP INT QUIT TERM
trap "sig_exit" EXIT

case "$1" in
    -h|--help|"")
	echo "Usage: viname Files You Want To Rename"
	echo "       viname -i filelist"
	echo "       viname -e command"
	echo "       viname -r directory"
	echo "		 rename all files in directory"
	echo
	echo "Then edit the Filenames in your favorite editor."
	echo "After exiting, the files are renamed according to"
	echo "their new name in the file."
	echo "Be careful not to delete or insert new lines, exept"
	echo "you really know, what you're doing ;)"
	echo "Directories cannot be renamed. If you do so, new"
	echo "directories will be created and the old ones will"
	echo "be kept."
	echo
	echo "e.g. viname -e 'find -name *&*'"
	exit 0
	;;
    -i)
	cat "$2" > $OLD
	;;
    -e)
	$2 > $OLD
	;;
    -r)
	shift
	while [ ! -z "$1" ]; do
          find "$1" -type f
          shift
	done | sort > $OLD
	;;
    *)
	while [ ! -z "$1" ] ; do
          echo "$1" >> $OLD
          shift
	done
	;;
esac

cp $OLD $NEW

${VISUAL:-${EDITOR:-/usr/bin/vi}} $NEW

if ! [ $NEW -nt $OLD ]
then
    echo abort
    exit
fi

while read FILE # from $OLD
do
    mv -- "$FILE" "$FILE".$EXT
done < $OLD

exec 0< $OLD
exec 3< $NEW

while read OLDFILE
do
    read NEWFILE <&3
    if [ -f "$NEWFILE" ]; then
	echo "Cannot rename '$OLDFILE.$EXT' to '$NEWFILE': file exists"
    else
	NEWDIR=`dirname "$NEWFILE"`
	[ ! -d "$NEWDIR" ] && mkdir -p "$NEWDIR"
	mv -- "$OLDFILE".$EXT "$NEWFILE"
    fi
done