TMPDIR   ?= _tmp
BUILDDIR ?= _build
PAGESDIR ?= pages
DATADIR  ?= data
TEMPLATE ?= $(DATADIR)/template.html

PAGES != find $(PAGESDIR) -name '*.md'
OUTPUTPAGES = $(patsubst $(PAGESDIR)/%.md,$(BUILDDIR)/%.html,$(PAGES))

STYLE != find style -type f
OUTPUTSTYLE = $(patsubst %,$(BUILDDIR)/%,$(STYLE))

OUTPUT = $(OUTPUTPAGES) $(OUTPUTSTYLE)

LANGFILTER = $(TMPDIR)/langfilter
EXECS = $(LANGFILTER)

.PHONY: all
all: build

.PHONY: build
build: $(OUTPUT)

$(BUILDDIR)/%.html: $(PAGESDIR)/%.md $(TEMPLATE) $(LANGFILTER)
	mkdir -p $(dir $@)
	pandoc -s --toc --template $(TEMPLATE) --filter $(LANGFILTER) -o $@ $<

$(BUILDDIR)/%: %
	mkdir -p $(dir $@)
	cp $< $@

$(LANGFILTER): langfilter/*.hs langfilter/langfilter.cabal
	mkdir -p $(dir $@)
	cabal build -v0 all
	find dist-newstyle -name $(notdir $@) \
	  -print -type f -exec cp {} $(TMPDIR) \;


.PHONY: clean distclean
clean:
	rm -rf $(BUILDDIR)
distclean: clean
	rm -rf $(TMPDIR)