Makefile for building Graphviz graphs

Makefile

SRC := $(wildcard *.dot *.gv)
CMD := dot


.PHONY: help Makefile

# Put it first so that "make" without argument is like "make help".
help:
	@echo Usage:
	@echo
	@echo "    make format CMD=cmd"
	@echo
	@echo -n where format is
	@dot -T? 2>&1 | grep -o " one of: .*"
	@echo
	@echo and cmd is optionally one of: dot [default] neato fdp sfdp twopi circo

# Catch-all target: route all unknown targets to $(CMD) -T
%: Makefile
	@# Be careful to strip renderer and formatter from suffix
	$(foreach src,$(SRC),$(CMD) -T $@ $(src) -o $(addsuffix .$(firstword $(subst :, ,$@)),$(basename $(src)));)