#!/bin/bash

#  The lazy executer - Only starts an external X client once if the search criteria
#		       is correct.

#  Usage:
#
#	lazy {xdotool search args} -- {other command to execute with 'i3-msg exec'}
#

#  Example (i3 window manager):
#
#	bindkey $mod+Control+k exec --no-startup-id \
#					lazy --name "Google Calendar" \
#					-- gnome-www-browser --app=https://calendar.google.com
#

# We are going through all the arg wrangling due to needing to split the arguments
# between xdotool and i3-msg exec. The argument quoting here is hell, touch it at your
# own peril.

# The following commands are intercepted for xdotool. Refer to the man page under search
# options.
#
#	--all
#	--any
#	--class {class}
#	--classname {classname}
#	--name {window title}
#	--title {window title} [deprecated]
#
# All passed search criteria with arguments appear to be partial and regex enabled.
#
# Any other arguments before the '--' will be flagged as an error. Anything after will
# be passed to 'i3-msg exec'.
#
eval set -- $(getopt  -l all,any,class:,classname:,name:,title: -n $0 -- "eatme" "$@")

declare -A SEARCH_ARGS
while true; do
	case "$1" in
		--) 	shift;
			break;;

		--all|--any)
			eval SEARCH_ARGS[${1}]+='${1}';
			shift;
			continue;;

		--class|--classname|--name|--title)
			eval SEARCH_ARGS[${1}]+='${2}'
			shift 2;
			continue;;

		*) 	echo "ERROR - Existing bad argment, ${1@Q}!";
			exit -1;;
	esac
done

# The eval is needed to handling argument quoting correctly

# xdotool searches for existing X clients using the passed search criteria. If _NOT_
# found, the 'i3-msg exec' is executed.

eval xdotool search 									\
	${SEARCH_ARGS[--all]} 								\
	${SEARCH_ARGS[--any]} 								\
	${SEARCH_ARGS[--class]:+--class "\"${SEARCH_ARGS[--class]}\""} 			\
	${SEARCH_ARGS[--classname]:+--classname "\"${SEARCH_ARGS[--classname]}\""} 	\
       	${SEARCH_ARGS[--name]:+--name "\"${SEARCH_ARGS[--name]}\""} 			\
	${SEARCH_ARGS[--title]:+--title "\"${SEARCH_ARGS[--title]}\""} 			\
	|| i3-msg exec -- $@