Install and configure timekpr on debian-derived GNU/Linux

setup_timekpr

#!/usr/bin/env bash

# USE AT OWN RISK. Read, understand and adapt.
# Part of my suite of new host configuration scripts

# $1: operating system, either 'linux', 'darwin', *bsd or 'cygwin'

if [ $# != 1 ]; then
    echo "Usage: $0 os" 1>&2
    exit 1
fi

case "$1" in

    [Ll]inux)
        mkdir -p "${HOME}/src"
        cd "${HOME}/src"

        echo 1>&2
        echo Downloading, extracting, building and installing timekpr from LaunchPad 1>&2
        echo 1>&2

        curl -L -O 'https://launchpad.net/timekpr/trunk/0.3.2/+download/timekpr_0.3.2%7Eppa1%7Eubuntu2.tar.gz'
        # Creates a dir named 'stable' WTF
        tar --extract --gzip --file 'timekpr_0.3.2%7Eppa1%7Eubuntu2.tar.gz'
        cd stable

        # Invoke timekpr config GUI using sudo not su
        sed -i 's/gksu/gksudo/' debian/timekpr.desktop

        # Byte-compile timekpr executables
        python ./setup.py
        # Run the (partial) installer
        sudo ./install.sh
        # Install the manfile
        sudo mkdir -p /usr/local/share/man/man8
        sudo cp doc/timekpr.8 /usr/local/share/man/man8/
        # Install the init.d script
        sudo cp debian/timekpr.init /etc/init.d/timekpr
        sudo chmod 755 /etc/init.d/timekpr
        # Link runlevels to init.d script
        sudo ln -s /etc/init.d/timekpr /etc/rcS.d/S20timekpr
        sudo ln -s /etc/init.d/timekpr /etc/rc0.d/K01timekpr
        sudo ln -s /etc/init.d/timekpr /etc/rc1.d/K55timekpr
        sudo ln -s /etc/init.d/timekpr /etc/rc2.d/S20timekpr
        sudo ln -s /etc/init.d/timekpr /etc/rc3.d/S55timekpr
        sudo ln -s /etc/init.d/timekpr /etc/rc4.d/S55timekpr
        sudo ln -s /etc/init.d/timekpr /etc/rc5.d/S55timekpr
        sudo ln -s /etc/init.d/timekpr /etc/rc6.d/K55timekpr

        # Set up pam
        sudo debian/timekpr.postinst
        echo
        echo Check that your display manager has been configured for timekpr if
        echo it is not among those handled by timekpr.postinst
        echo

        cd
        ;;

    *)
        echo Timekeeper only runs on GNU/Linux 1>&2
        # Don't error; this script runs for all OSes
        ;;

esac