#!/bin/sh
# simple script that generates entrance config using build_config.sh.in
# and .desktop files from /usr/share/xsessions

CONFIGIN="/etc/X11/entrance/build_config.sh.in"
CONFIGOUT="/tmp/build_config.sh"
SESSIONS="/tmp/sessions"
ICONDIR="/usr/share/entrance/images/sessions"
THEMEDIR="/usr/share/entrance/themes"

die() {
	echo "$2" >&2
	exit $1
}
[ -f $CONFIGIN -a -r $CONFIGIN ] || \
	die 1 "No config file $CONFIGIN, or not readable"

[ -d /usr/share/xsessions ] || die 2 "No xsessions dir"

# two common desktops
cat << EOF > /tmp/default.desktop
Name=Default
Exec=default
EOF
cat << EOF > /tmp/failsafe.desktop
Name=Failsafe
Exec=failsafe
EOF


SESSION_SRTING="$(grep -E "^#session:" $CONFIGIN | sed 's/^#session://')"

: > $SESSIONS
NUM=0
for DESKTOP in /tmp/default.desktop /usr/share/xsessions/*.desktop \
	/tmp/failsafe.desktop; do

	EXEC=$(grep -E "^Exec=" $DESKTOP | sed 's/^Exec=//' )
	[ -n "$EXEC" ] || ( echo "Skipping $DESKTOP !!!" >&2; continue )
	[ -n "$(which $EXEC 2>/dev/null)" ] && EXEC=$(which $EXEC)
	EXEC=$(echo $EXEC | sed 's_/_\\/_g')
	
	NAME="$(grep -E "^Name=" $DESKTOP | sed 's/^Name=//' | \
		sed 's_/_\\/_g')"
	[ -n "$NAME" ] || NAME="$EXEC"

	ICON="$(basename $DESKTOP .desktop).png"
	[ -r $ICONDIR/$ICON ] || ICON=default.png

	echo "$SESSION_SRTING" | \
		sed -e "s/@NUM@/$NUM/g" -e "s/@SESSION@/$EXEC/g" \
		    -e "s/@TITLE@/$NAME/g" -e "s/@ICON@/$ICON/g" >> $SESSIONS
	NUM=$(($NUM+1))
done

THEME=$(grep entrance/theme $CONFIGIN | sed 's/.*\s//; s/"//g')
OLDT=
NEWT=
if ! [ -r $THEMEDIR/$THEME ]; then
	OLDT=$(grep entrance/theme $CONFIGIN | sed 's/.*\s//')
	NEWT=$(ls $THEMEDIR | head -n 1)	
fi

sed -e "s/@auth_mode@/1/" -e "s/@COUNT@/$NUM/" -e "s/$OLDT/$NEWT/" $CONFIGIN > $CONFIGOUT
chmod 755 $CONFIGOUT
exec $CONFIGOUT