Kecerahan (Brightness control) Bash version

kecerahan

#!/bin/bash
# SPDX-License-Identifier: MIT
# Copyright © 2019-present Iqbal Rifai

# ------------------------------------------------------------------
# MIT License
# -----------
#
# Copyright (c) 2019-present Iqbal Rifai (https://iqbalrifai.eu.org)
# Permission is hereby granted, free of charge, to any person
# obtaining a copy of this software and associated documentation
# files (the "Software"), to deal in the Software without
# restriction, including without limitation the rights to use,
# copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the
# Software is furnished to do so, subject to the following
# conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
# OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
# HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
# WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
# OTHER DEALINGS IN THE SOFTWARE.
# ------------------------------------------------------------------

# --------------------------------------------
# Usage kecerahan [options....] <value>
# -------------------------------------
#
# options:
#    -h, --help           print this help
# 
#    -b, --brightness     set level brightness
#
#    <value>              range:
#                         0.1-1.0 : 1%-100%
#                         1.0-5.0 : 100%-500%
# --------------------------------------------

RED=`tput setaf 1`
WHITE=`tput setaf 7`
GREEN=`tput setaf 2`
NC=`tput sgr0`
if [[ $EUID -ne 0 ]]; then
        echo "${RED}Error${NC}${WHITE}:${NC} ${WHITE}This script must be run as root${NC}" 
        exit 1
fi

bright(){
        isnumber='^[0-9]+(\.[0-9]+)$'
        if [[ $brightness =~ $isnumber ]]; then
                xrandr --listmonitors | grep "^ " | cut -f 6 -d' ' | \
                xargs --replace=MONITOR xrandr --output MONITOR --brightness $brightness
                echo "${GREEN}Success${NC} ${WHITE}set brightness to $brightness${NC}"
        else
                echo "${RED}Error${NC}${WHITE}:${NC} ${WHITE}Only Number is allowed${NC}" >&2;
                exit 1
        fi 
}

helpm() {
        name="$(basename $0)"
        echo "Usage: $name [options....] <value>"
        echo
        echo "options:"
        echo "   -h, --help           print this help"
        echo
        echo "   -b, --brightness     set level brightness"
        echo
        echo "   <value>              range:"
        echo "                        0.1-1.0 : 1%-100%"
        echo "                        1.0-5.0 : 100%-500%"
        echo
        exit 1
}

case "$1" in
        -b | --brightness)
            brightness="$2"
            bright
            ;;
        -h | --help)
            helpm
            exit 1
            ;;
        --)
            echo "${RED}Error${NC}${WHITE}:${NC} ${WHITE}Unknown option: $1${NC}" >&2
            exit 1
            ;;
        -*)
            echo "${RED}Error${NC}${WHITE}:${NC} ${WHITE}Unknown option: $1${NC}" >&2
            exit 1 
            ;;
        *)
            helpm
            exit 1
            ;;
esac