HOST ?= rhiannon.website
REMOTE_USER ?= www-data
IDFILE ?= ~/.ssh/xyz
REMOTE_DIR ?= lang

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

STATICEXTS := yaml

PAGES != find $(PAGESDIR) -name '*.md'
STATICS != parallel find $(PAGESDIR) -name '\*.{}' ::: $(STATICEXTS)
OUTPUTPAGES = \
  $(patsubst $(PAGESDIR)/%.md,$(BUILDDIR)/%.html,$(PAGES)) \
  $(patsubst $(PAGESDIR)/%,$(BUILDDIR)/%,$(STATICS))

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

OUTPUT = $(OUTPUTPAGES) $(OUTPUTSTYLE)

LANGFILTER = $(TMPDIR)/langfilter
LAANTAS_SCRIPT = $(TMPDIR)/laantas-script
EXECS = $(LANGFILTER)

CABAL_FLAGS ?= -O -v0

.PHONY: all
all: build

.PHONY: build
build: $(OUTPUT)

$(BUILDDIR)/%.html: $(PAGESDIR)/%.md $(TEMPLATE) $(LANGFILTER) $(LAANTAS_SCRIPT)
	@echo "[pandoc] $<"
	mkdir -p $(dir $@)
	LAANTAS_SCRIPT="$(LAANTAS_SCRIPT)" \
	  DIRNAME="$(subst $(PAGESDIR),$(BUILDDIR),$(dir $<))" \
	  pandoc -s --toc --template $(TEMPLATE) -o $@ $< \
	    --filter $(LANGFILTER)

$(BUILDDIR)/%: $(PAGESDIR)/%
	$(copy)

$(BUILDDIR)/%: %
	$(copy)

define copy
  @echo "[copy] $<"
  mkdir -p $(dir $@)
  cp $< $@
endef

$(LANGFILTER): langfilter/*.hs langfilter/langfilter.cabal
	$(cabal-exe)

$(LAANTAS_SCRIPT): laantas-script/*
	$(cabal-exe)

define cabal-exe
  @echo "[build] $(notdir $@)"
  cabal build $(notdir $@) $(CABAL_FLAGS)
  mkdir -p $(dir $@)
  find dist-newstyle -name $(notdir $@) -type f -exec cp {} $(TMPDIR) \;
endef


upload: build
	@echo "[upload]"
	@rsync --recursive --partial --progress --copy-links \
	       --compress --human-readable --hard-links --size-only \
	       --delete --delete-after \
	       --rsh='ssh -l $(REMOTE_USER) -i $(IDFILE)' \
	       $(BUILDDIR)/ $(HOST):$(REMOTE_DIR)/



.PHONY: clean distclean
clean:
	@echo "[clean]"
	rm -rf $(BUILDDIR)
	rm -rf $(TMPDIR)
distclean: clean
	@echo "[distclean]"
	cabal clean

.SILENT: