#--*- Makefile -*--

#*
# This is a snipped Makefile tha allows you to inspect arbitrary
# variable value:
#
# USAGE:
# make display VARIABLE=LD_LIBRARY_PATH
# make display VARIABLE=YOUR_MAKE_VARIABLE_NAME
#
# The default displayed variable is PATH.
#**

MAX_DISPLAY ?= 1000

# Allow to shorten 'make display VARIABLE=X' to 'make display VAR=X':
VAR      ?= PATH
VARIABLE ?= ${VAR}

.PHONY: display display-all

display:
	@echo ${VARIABLE}=$(wordlist 1,${MAX_DISPLAY},${${VARIABLE}})
	@if [ $(words ${${VARIABLE}}) -gt ${MAX_DISPLAY} ]; then \
		echo "make display: WARNING, there are $(words ${${VARIABLE}}) words in the" \
		     "variable ${VARIABLE}."; \
		echo " Only ${MAX_DISPLAY} first word(s) are displayed." \
		     "Set 'make' parameter MAX_DISPLAY to different value to get more/less of them,"; \
		echo " e.g 'make display VARIABLE=${VARIABLE} MAX_DISPLAY=2000'"; \
	fi

display-all:
	grep -h '^[A-Z].* =' [Mm]ake* \
	| awk '{print $$1}' \
	| xargs -i ${MAKE} --no-print display VARIABLE="{}"