Wallpaper script supports color, no longer sources conf file

session/src/xmd-load-wallpaper

@@ -1,9 +1,51 @@
 #!/bin/sh
 
-if type "$XMD_USERDIR/wallpaper" > /dev/null; then
-	. "$XMD_USERDIR/wallpaper"
+name=`basename "$0"`
+configFilePath="$XMD_USERDIR/wallpaper"
 
-	if type xwallpaper > /dev/null; then
+isInstalled() {
+	type "$1" > /dev/null
+}
+
+shouldHaveInstalled() {
+	if ! isInstalled "$1"; then
+		echo "$name: $1 is not installed" >&2
+		return 1
+	fi
+}
+
+usage() {
+	echo "Usage: $name" >&2
+	exit 2
+}
+
+[ "$#" -gt 0 ] && usage
+
+if type "$configFilePath" > /dev/null; then
+	color="black"
+	
+	while read -r line; do
+		IFS="=" read key value << EOF
+$line
+EOF
+		case "$key" in
+		"mode")  mode="$value";;
+		"file")  file="$value";;
+		"color") color="$color";;
+		*)      echo "$name: bad key $key in $configFilePath" >&2;;
+		esac
+	done < "$configFilePath"
+
+	case "$mode" in
+	"" | center | focus | maximize | stretch | tile | zoom) ;;
+	*)
+		echo "$name: bad mode $mode" >&2
+		exit 1
+		;;
+	esac
+	
+	[ -n color ] && shouldHaveInstalled xsetroot   && \
+		xsetroot -solid "$color"
+	[ -n mode  ] && shouldHaveInstalled xwallpaper && \
 		xwallpaper "--${mode}" "$file"
 fi
-fi