NEW support multiple monitors with full customization

src/var/lib/kiosk-browser/.xsession

@@ -1,23 +1,74 @@
 #!/bin/bash
 exec 2> >(logger -t kiosk-browser)
+
+# windows manager helps with fullscreen
+metacity &
+
+# cache xrandr configuration
+XRANDR_OUTPUT="$(xrandr)"
+function xrandr_find_port {
+    # find connected port matching pattern
+    read port junk < <(grep connect <<<"$XRANDR_OUTPUT" | grep -i "$1") ; echo $port
+}
+
+function xrandr_find_other_ports {
+    # find ports NOT matching pattern
+    grep connect <<<"$XRANDR_OUTPUT" | cut -f 1 -d " " | grep -v $(xrandr_find_port "$1")
+}
+
 set -x
 if test -r /etc/default/kiosk-browser ; then
     source /etc/default/kiosk-browser
 fi
 
-# windows manager helps with fullscreen
-metacity &
+
+if [[ ! "$KIOSK_BROWSER_PORTS" ]] ; then
+	# set . as a built-in default to use the first connected port that xrandr reports
+	KIOKS_BROWSER_PORTS=.
+fi
+
+if [[ ! "$KIOSK_BROWSER_START_PAGE" ]] ; then
+	# point to our github page as built-in default
+	KIOSK_BROWSER_START_PAGE=https://github.com/ImmobilienScout24/kiosk-browser
+fi
+
+# configure displays
+xrandr $(
+	xrandr_position=
+	for (( c=0 ; c<${#KIOSK_BROWSER_PORTS[@]} ; c++ )) ; do
+		port=$(xrandr_find_port "${KIOSK_BROWSER_PORTS[c]}")
+		echo "--output $port ${KIOSK_BROWSER_XRANDR_EXTRA_OPTS[c]} $xrandr_position --auto"
+		xrandr_position="--right-of $port"
+	done
+	)
+sleep 3
+
+# xrandr configuration changed, update cache
+XRANDR_OUTPUT="$(xrandr)"
 
 # disable screen blanking
 xset -dpms
 xset s off
 xset s noblank
 
+#forget about running jobs
+disown -a
+
 while true; do
-  # exit if no display given, use xwininfo to test for running X server
-  xwininfo -root &>/dev/null || exit 0
-  # wipe state data
-  rm -Rf ~/.config/chromium/* ~/.cache/* ~/.pki/*
-  chromium-browser "${KIOSK_BROWSER_OPTIONS[@]}" --no-first-run --start-maximized --kiosk "${KIOSK_BROWSER_START_PAGE:=https://github.com/ImmobilienScout24/kiosk-browser}"
-  sleep 5
+	# exit if no display given, use xwininfo to test for running X server
+	xwininfo -root &>/dev/null || exit 0
+	# wipe state data
+	rm -Rf ~/.config/chromium/* ~/.cache/* ~/.pki/*
+	# if KIOSK_BROWSER_PORTS is set, assume that it specifies multiple screens connected.
+	for (( c=0 ; c<${#KIOSK_BROWSER_PORTS[@]} ; c++ )) ; do
+		chromium-browser --user-data-dir=$HOME/.config/chromium/$c "${KIOSK_BROWSER_OPTIONS[@]}" --no-first-run --start-maximized --kiosk "${KIOSK_BROWSER_START_PAGE[c]:-$KIOSK_BROWSER_START_PAGE}" &
+		sleep 1
+		# move new window to the current screen. We identify the window by the --user-data-dir option which appears in the window class name :-)
+		port=$(xrandr_find_port "${KIOSK_BROWSER_PORTS[c]}")
+		port_x=$(sed -ne "/$port/s#[^+].*+\([0-9]\+\)+.*#\1#p" <<<"$XRANDR_OUTPUT")
+		xdotool search --classname chromium/$c windowmove --sync $port_x 0
+	done
+
+	wait # for the browsers to finish
+	sleep 5
 done