#!/bin/bash
#
# Setting default browser using xdg utils
#
#    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/>.
#
# 2021-11-20
# @linux-aarhus (c) root.nix.dk
# https://root.nix.dk/en/utility-scripts/set-browser-script
#

print_usage(){
    echo "Usage:"
    echo "  Supply browser desktop file as the first argument"
    echo "  e.g.   set-browser.sh firefox.desktop"
    echo "" 
}

show_available_browsers(){
    echo "Available browsers (installed)"
    echo "---"
    # funny thing with cut when splitting a path
    # one would expect the column to be number 4 but it is 5
    # as string starts with `/` and therefore first column is empty
    # e.g. /usr/share/applications/firefox.desktop
    grep -rl 'internet' /usr/share/applications | cut -d'/' -f5
    echo "---"  
}

set_browser() {
    # set scheme handlers
    xdg-mime default "$1" x-scheme-handler/https
    xdg-mime default "$1" x-scheme-handler/http
    # set default browser
    xdg-settings set default-web-browser "$1"
    echo "Default browser set using $1"
}

# check if argument is supplied
if [[ "$1" == "" ]]; then
    print_usage
    show_available_browsers
    exit 1
fi

# check if desktop file
if [[ "$1" =~ ".desktop" ]]; then
    # check if the file exist
    if [[ -f "/usr/share/applications/$1"  ]]; then
        set_browser "$1"
    else
        echo "$1 - file not found"
        show_available_browsers
        exit 1
    fi
else
    echo "$1 is not a .desktop file"
    show_available_browsers
    exit 1
fi