xephwrap: Add Xephyr wrapper script

xephwrap

@@ -0,0 +1,66 @@
+#! /usr/bin/env bash
+#
+# xephwrap.sh
+# Copyright (C) 2018 salt <salt@lap-th-e560-0>
+#
+# Distributed under terms of the MIT license.
+#
+
+name="$(basename $0 .sh)"
+
+function log() {
+	[ -z ${1+x} ] && return 1
+	printf "\e[94m$name\e[0m: $1\n"
+}
+
+function xprompt() {
+	[ -z ${1+x} ] && return 2
+	[ -z ${2+x} ] || default="$2"; suffix=" [$default]"
+	read -p "$1$suffix: "
+	if [ "$REPLY" == "" ]; then
+		export REPLY="$2"
+	fi
+}
+
+function validatedep() {
+	[ -z ${1+x} ] && return 2
+	if ! which "$1" > /dev/null 2>&1; then
+		return 1
+	fi
+	return 0
+}
+
+# Validate dependencies
+for dep in Xephyr; do
+	if ! validatedep "$dep"; then
+		log "Failed to validate dependency: \"$dep\""
+		exit 1
+	fi
+done
+
+# Prompt for user interaction
+xprompt "Size" "1280x720"
+size="$REPLY"
+
+xprompt "Display" "10"
+display="$REPLY"
+
+if ! [ "$display" -ge "-1" ]; then
+	log "Invalid response for display: \"$display\""
+	exit 4
+fi
+if [ "$display" == "$DISPLAY" ]; then
+	log "Response matches host display: \"$display\""
+	exit 5
+fi
+
+# Start the server up
+Xephyr \
+	-ac \
+	-screen "$size" \
+	:"$display" \
+	&
+disown
+log "Started Xephyr server"
+exit 0
+