#!/bin/bash
#
# simple script to ease XFCE installation on a WSL (Windows Subsystem for Linux)
# environment:
#
# This will install essential Xorg packages (without install server side as WSL
# currently don't have the ability of starting a native Xserver)
#
# You'll have to rely on a Windows native Xserver such like vcxsrv or Xming
#
# 2019-02-16 - Eric Belhomme


if [ $UID != 0 ]; then
	echo "Fatal: run run as root user"
	exit 1
fi

function install_locales() {
	# sudo dpkg-reconfigure locales
	BAKIFS=$IFS
	IFS=$'\n'
	LOCALES=('en_US ISO-8859-1' \
		'en_US.ISO-8859-15 ISO-8859-15' \
		'en_US.UTF-8 UTF-8' \
		'fr_FR ISO-8859-1' \
		'fr_FR.UTF-8 UTF-8' \
		'fr_FR@euro ISO-8859-15')

	for ITEM in ${LOCALES[@]}; do
		sed -i -e "s/^# .*$ITEM/$ITEM/" /etc/locale.gen
	done
	IFS=$BAKIFS
	dpkg-reconfigure --frontend=noninteractive locales && update-locale LANG=en_US.UTF-8
	cat > /etc/default/locale <<EOF
LANGUAGE=en_US.UTF-8
LC_ALL=C
LANG=en_US.UTF-8
EOF
}

function install_xcore() {
	apt-get install -y xserver-xorg-video-dummy xserver-xorg-input-void xserver-xorg-core
	apt-get install -y xorg
	apt-get install -y x11-xkb-utils xfonts-base xfonts-encodings xfonts-scalable \
		xfonts-utils x11-session-utils  dbus-x11 desktop-base desktop-file-utils gconf* \
		gnome-mime-data gnome-themes-standard*
}

function install_xfce4() {
	apt-get install -y xfce4-session xfce4-settings xfdesktop4* xfce4-appfinder \
		xfce4-panel xfce4-notifyd xfce4-xkb-plugin notification-daemon thunar
}

function install_gutils() {
	apt-get install -y terminator
	apt-get install -y --no-install-recommends meld firefox-esr firefox-esr-l10n-fr
	update-alternatives --set x-terminal-emulator /usr/bin/terminator
	update-alternatives --set x-www-browser /usr/bin/firefox-esr
}

function configure_xstart() {
	WINHOME=$(wslpath $(cmd.exe /C "echo %USERPROFILE%"))
	if [ ! -e ${HOME}/winhome ]; then
		ln -s $WINHOME ${HOME}/winhome
	fi

	if [ ! -e ${HOME}/startxfce4 ]; then
	cat > ${HOME}/startxfce4 <<EOF
#!/bin/bash
cd $HOME
#eval "$(ssh-agent -s)" &> /dev/null
export DISPLAY="localhost:0.0"

exec dbus-run-session -- bash -l -c startxfce4 &> $HOME/xfce-session.log
EOF
	fi
	chmod 0750 ${HOME}/startxfce4

	if [ "$(grep -c "export DISPLAY")" == "0" ]; then
		echo 'export DISPLAY="localhost:0.0"' >> ${HOME}.bashrc
	fi
	if [ "$(grep -c "export LD_PRELOAD")" == "0" ]; then
		echo 'export LD_PRELOAD=/usr/lib/x86_64-linux-gnu/libGL.so.1' >> ${HOME}.bashrc
	fi
	if [ "$(grep -c "export NO_AT_BRIDGE")" == "0" ]; then
		echo 'export NO_AT_BRIDGE=1' >> ${HOME}.bashrc
	fi
	if [ "$(grep -c "export WINHOME")" == "0" ]; then
    echo "export WINHOME=$WINHOME" >> ${HOME}.bashrc
  fi

	if [ ! -e $WINHOME/Desktop/Xfce4.xlaunch ]; then
	cat > $WINHOME/Desktop/Xfce4.xlaunch << EOF
<?xml version="1.0" encoding="UTF-8"?>
<XLaunch WindowMode="Windowed" ClientMode="StartProgram" LocalClient="True" Display="-1" LocalProgram="C:\Windows\System32\wsl.exe -u $USER ${HOME}/startxfce4" RemoteProgram="xterm" RemotePassword="" PrivateKey="" RemoteHost="" RemoteUser="" XDMCPHost="" XDMCPBroadcast="False" XDMCPIndirect="False" Clipboard="True" ClipboardPrimary="True" ExtraParams="" Wgl="True" DisableAC="False" XDMCPTerminate="False"/>
EOF
	fi
}

###


function exit_help() {
	cat <<EOF
 $0 - installs XFCE4 graphical on WSL env

	usage : $0 -h -a -l -c -x -g

		-h : this help
		-l : set locales
		-c : installs Xorg core
		-x : installs Xfce4 Window Manager
		-g : installs some GUI tools (terminator, meld, Firefox)
		-i : configure Linux and Windows env to start Xfce4 with vcXsrv
		-a : do all of the above

EOF
	exit 1
}

if [ "$#" -eq 0 ]; then exit_help; fi

loca=0
xcor=0
xfce=0
guti=0
vcxs=0
while getopts "halcxgi" option; do
  case "$1" in
		-a)
			loca=1
			xcor=1
			xfce=1
			guti=1
			vcxs=1
			shift; ;;
		-l)
			loca=1; shift; ;;
		-c)
			xcor=1; shift; ;;
		-x)
			xfce=1; shift; ;;
		-g)
			guti=1; shift; ;;
		-i)
			vcxs=1; shift; ;;
    *)
			exit_help
			shift
			;;
  esac
done

# do this anytime
if [ -z "$(find /var/cache/apt/pkgcache.bin -mmin -60)" ]; then
  apt-get update
fi
apt-get install -y locales bash-completion git vim
update-alternatives --set editor /usr/bin/vim.basic

if [ $loca -eq 1 ]; then install_locales; fi
if [ $xcor -eq 1 ]; then install_xcore; fi
if [ $xfce -eq 1 ]; then install_xfce4; fi
if [ $guti -eq 1 ]; then install_gutils; fi
if [ $vcxs -eq 1 ]; then configure_xstart; fi