functions

# Some useful functions for shell
# yeasy@github
#


# colorfully output string
echo_r () {
    [ $# -ne 1 ] && return 0
    echo -e "\033[31m$1\033[0m"
}
echo_g () {
    [ $# -ne 1 ] && return 0
    echo -e "\033[32m$1\033[0m"
}
echo_y () {
    [ $# -ne 1 ] && return 0
    echo -e "\033[33m$1\033[0m"
}
echo_b () {
    [ $# -ne 1 ] && return 0
    echo -e "\033[34m$1\033[0m"
}

# check if a command existed
command_exists() {
	command -v "$@" > /dev/null 2>&1
}

# perform some very rudimentary platform detection
os_detect () {
	lsb_dist=''
	if command_exists lsb_release; then
		lsb_dist="$(lsb_release -si)"
	fi
	if [ -z "$lsb_dist" ] && [ -r /etc/lsb-release ]; then
		lsb_dist="$(. /etc/lsb-release && echo "$DISTRIB_ID")"
	fi
	if [ -z "$lsb_dist" ] && [ -r /etc/debian_version ]; then
		lsb_dist='debian'
	fi
	if [ -z "$lsb_dist" ] && [ -r /etc/fedora-release ]; then
		lsb_dist='fedora'
	fi
	if [ -z "$lsb_dist" ] && [ -r /etc/centos-release ]; then
		lsb_dist='centos'
	fi
	if [ -z "$lsb_dist" ] && [ -r /etc/os-release ]; then
		lsb_dist="$(. /etc/os-release && echo "$ID")"
	fi

	lsb_dist="$(echo "$lsb_dist" | tr '[:upper:]' '[:lower:]')"
	case "$lsb_dist" in
		amzn|fedora|centos)
			if [ "$lsb_dist" = 'amzn' ]; then
				(
					set -x
					echo "amzn"
				)
			else
				(
					set -x
					echo "fedora|centos"
				)
			fi
			exit 0
			;;

		'opensuse project'|opensuse|'suse linux'|sled)
			(
				set -x
				echo "opensusue"
			)
			exit 0
			;;

		ubuntu|debian|linuxmint|'elementary os'|kali)
			export DEBIAN_FRONTEND=noninteractive

            echo "ubuntu|debian"
		
			exit 0
			;;

		gentoo)
			(
				set -x
                echo "gentoo"
			)
			exit 0
			;;
	esac
}