port _arduino_prop to make

This is kind of criminal, but I'm very proud of it.

etc/sketch-arduino-cli.mk

@@ -2,6 +2,15 @@ mkfile_path := $(abspath $(lastword $(MAKEFILE_LIST)))
 mkfile_dir := $(dir $(mkfile_path))
 
 
+# Make a variable lazily evaluated at first call
+# From https://blog.jgc.org/2016/07/lazy-gnu-make-variables.html
+make-lazy = $(eval $1 = $$(eval $1 := $(value $(1)))$$($1))
+
+
+
+
+
+
 export KALEIDOSCOPE_DIR ?= $(abspath $(mkfile_dir)/..)
 export KALEIDOSCOPE_BIN_DIR ?= $(KALEIDOSCOPE_DIR)/bin
 
@@ -28,6 +37,24 @@ else
 export ARDUINO_VERBOSE ?= 
 endif
 
+# This is horrible. But because make doesn't really support
+# multi-line variables and we want to cache the full
+# _arduino_props in a variable, which means letting make 
+# split the properties on space, which is what it converts
+# newlines into. To make this go, we we need to replace interior
+# spaces in the variables with something. We chose the fire 
+# emoji, since it accurately represents our feelings on this 
+# state of affairs. Later, when finding props, we need to reverse 
+# this process, turning fire into space.
+_arduino_props = $(shell ${ARDUINO_CLI}  compile --show-properties "$${SKETCH_FILE_PATH}"|perl -p -e"s/ /🔥/g")
+$(call make-lazy,_arduino_props)
+
+_arduino_prop = $(subst $1=,,$(subst 🔥, ,$(filter $1=%,$(_arduino_props))))
+
+# How to use_arduino_prop
+# $(call _arduino_prop,recipe.hooks.sketch.prebuild.2.pattern)
+
+
 #
 # Build path config