scale-viber

#!/bin/bash
#    scale-viber, (C) spiros Georgaras <sng@hellug.gr>, 2020
#
#    This program 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.
#
#    This program 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 this program.  If not, see <https://www.gnu.org/licenses/>.
#    
#    Last modified: 12/02/2021 19:46:36 +0200

function print_help(){
    echo "Utility to scale Viber under Linux

Usage: $(basename "$0") [OPTIONS] [Scale Factor]

Options are:
    -d  DESK
        Location of Viber's Desktop file
        Default: /usr/share/applications/viber.desktop
    -p  PATH
        Path of Viber's executable
        Default: /opt/viber/Viber
    -h  Print this help and exit

[Scale Factor] is 0.1 - 2.0 (zoom factor)
If [Scale Factor] is not specified, 1.2 is used
"
}

SCALE="1.2"
while [ ! -z "$1" ];do
    case "$1" in
        -h)
            print_help
            exit
            ;;
        -d)
            shift
            DESK="$1"
            shift
            ;;
        -p)
            shift
            VIBER_COMMAND="$1"
            shift
            ;;
        *)
            SCALE="$1"
            shift
            ;;
    esac
done

if [ $(id -u) != "0" ];then
    print_help
    echo "ERROR: You must be root to execute this script"
    echo
    exit  1
fi


echo -ne "Looking for Viber desktop file ... "
if [ -z "$DESK" ];then
    if [ -e /usr/share/applications/viber.desktop ];then
        DESK=/usr/share/applications/viber.desktop
    else
        echo "not found"
        echo
        print_help
        echo "Please use -d parameter to specify it..."
        exit 1
    fi
else
    if [ ! -e "$DESK" ];then
        echo "not found"
        echo
        echo "Please check the value of parameter -p"
        echo
        exit 1
    fi
fi
echo found


echo -ne "Looking for Viber executable ... "
if [ -z "$VIBER_COMMAND" ];then
    if [ -e /opt/viber/Viber ];then
        VIBER_COMMAND=/opt/viber/Viber
    fi
else
    if [ ! -e "$DESK" ];then
        echo "not found"
        echo
        echo "Please check the value of parameter -d"
        echo
        exit 1
    fi
fi
echo found

if [ -z "$VIBER_COMMAND" ];then
    V1=$(which Viber)
    V2=$(which viber)
    if [ ! -z "$V1" ]; then VIBER_COMMAND="$V1";fi
    if [ ! -z "$V2" ]; then VIBER_COMMAND="$V2";fi
    if [ -z "$VIBER_COMMAND" ];then
        echo "not found"
        echo
        print_help
        echo "Please use -p parameter to specify it..."
        exit 1
    else
        echo found
    fi
fi

echo -ne "Alterning Desktop file ... "
sed "$DESK" -i -e '/Exec=/d'
echo "Exec=bash -c \"QT_SCALE_FACTOR=${SCALE} ${VIBER_COMMAND}\" %u" >> "$DESK"
echo "done"