.PHONY: check clean serve watch

MAKEFLAGS := -j$(shell nproc)

# Source- and destination files
srcs := $(shell find src -type f -not -name '*.gsp' -or -name 'index.gsp')
dsts := $(srcs:src/%=out/%)
dsts := $(dsts:%.gsp=%.html)
dsts := $(dsts:%.dot=%.svg)

# Destination directories
dirs := $(sort $(dir $(dsts)))

# Files that most *.gsp files will depend on
incs := $(wildcard include/*)

all: $(dirs) $(dsts)

$(dirs)&:
	@mkdir -p $(dirs)
	@printf 'MKDIR\t%s\n' $(dirs)

out/%: src/%
	@cp $< $@
	@printf 'CP\t%s\n' $@

out/%.svg: src/%.dot
	@dot -Tsvg $< >$@
	@printf 'DOT\t%s\n' $@


# Generate dependencies for GSP pages
gendeps = $(incs) $(wildcard $(dir $(patsubst out/%.html,src/%.gsp,$1))*.gsp)

.SECONDEXPANSION:
out/%.html: src/%.gsp $$(call gendeps,$$@)
	@PATH="$$PATH:./include" \
	m4 -P $(foreach dir,$(^D),-I$(dir)) include/lib.m4 $< | gsp >$@
	@printf 'GSP\t%s\n' "$@"

check:
	LANG=en_US.UTF-8 find src -name 'index.gsp' -exec \
	     aspell --home-dir=./ --ignore-case check {} \;

clean:
	rm -rf out

serve:
	darkhttpd out --daemon

watch:
	git ls-files -o | entr $(MAKE)