shutter OptiPNG PNG optimizer plugin

#! /usr/bin/env bash

###################################################
#
#  Copyright (C) 2008, 2009, 2010 Mario Kemper <[email protected]> and Shutter Team
#
#  This file is part of Shutter.
#
#  Shutter is free software; you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation; either version 3 of the License, or
#  (at your option) any later version.
#
#  Shutter is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#  along with Shutter; if not, write to the Free Software
#  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#
###################################################
#
#  OptiPNG Plugin by Roman Raguet http://askubuntu.com/a/329830/34298
#
#  recompresses png image files to a smaller size
#
###################################################

TEXTDOMAIN=shutter-plugins
TEXTDOMAINDIR=$SHUTTER_INTL
PLUGIN_NAME=$"Optipng Plugin"
PLUGIN_SORT=$"Recompress"
PLUGIN_TIP=$"OptiPNG is a PNG optimizer that recompresses image files to a smaller size"
PLUGIN_EXT="image/png"
#LOGO="/usr/share/shutter/resources/system/plugins/shell/optipngplugin/optipngplugin.png"
if [[ "${1}" = "name" ]];then
    echo "${PLUGIN_NAME}"
    exit 0
elif [[ "${1}" = "sort" ]];then
    echo "${PLUGIN_SORT}"
    exit 0
elif [[ "${1}" = "tip" ]];then
    echo "${PLUGIN_TIP}"
    exit 0
elif [[ "${1}" = "ext" ]];then
    echo "${PLUGIN_EXT}"
    exit 0
fi
FILE="${1}"
#WIDTH="${2}"
#HEIGHT="${3}"
#FILEYTPE="${4}"
#INTL_PATH="${5}"
#GEO="${2}x${3}"

# option -o7 is the best compression but takes quite long:
optipng -o7 "${FILE}"
exit 0