miaou-bash/install.sh

#!/bin/bash

## CONSTANTS

readonly CURDIR=$PWD
readonly REQUIRED_PKGS=(file git bc)
readonly MAIN_TAR_GZ_URL="https://git.artcode.re/miaou/miaou-bash/archive/main.tar.gz"

## FUNCTIONS

function push_directory {
    pushd "$1" || (echo "unable to push directory <$1>" && exit 1)
}

function pop_directory {
    popd || (echo "unable to pop from previous directory" && exit 1)
}

function root_required {
    [ "$(id -u)" -ne 0 ] && echo 'root privilege required' && exit 1
}

## MAIN

root_required

if [[ $CURDIR != '/opt/miaou-bash' ]]; then
    # download and fullfill /opt/miaou-bash, then run it from folder

    if [[ -L /opt/miaou-bash ]]; then
        /opt/miaou-bash/install.sh
    else
        rm -rf /opt/miaou-bash

        push_directory "$(mktemp -d)"
        wget $MAIN_TAR_GZ_URL
        tar -xzf main.tar.gz
        mv miaou-bash /opt/
        pop_directory
        rm -rf "$TEMP"

        push_directory /opt/miaou-bash && ./install.sh

    fi

else
    apt-get install -y "${REQUIRED_PKGS[@]}"
    ./init.sh
fi