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

TMPDIR      ?= _tmp
BUILDDIR    ?= _build
POSTSDIR    ?= posts
TEMPLATEDIR ?= templates

STATICEXTS := yaml

POSTS != find $(POSTSDIR) -name '*.md'
STATICS != parallel find $(POSTSDIR) -name '\*.{}' ::: $(STATICEXTS)
OUTPUTPOSTS = \
  $(patsubst $(POSTSDIR)/%.md,$(BUILDDIR)/%.html,$(POSTS)) \
  $(patsubst $(POSTSDIR)/%,$(BUILDDIR)/%,$(STATICS)) \
  $(BUILDDIR)/index.html

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

OUTPUT = $(OUTPUTPOSTS) $(OUTPUTSTYLE)

LANGFILTER = $(TMPDIR)/langfilter
LAANTAS_SCRIPT = $(TMPDIR)/laantas-script
ALL_TAGS = $(TMPDIR)/all-tags
POST_LISTS = $(TMPDIR)/post-lists
NICE_DATE = $(TMPDIR)/nice-date
EXECS = \
  $(LANGFILTER) $(LAANTAS_SCRIPT) \
  $(ALL_TAGS) $(POST_LISTS) $(NICE_DATE)

CABAL_FLAGS ?= -O -v0

.PHONY: all
all: build

.PHONY: build
build: $(EXECS) $(OUTPUT)


POSTDEPS = $(TEMPLATEDIR)/* $(LANGFILTER) $(LAANTAS_SCRIPT)

$(TMPDIR)/all-tags.md $(TMPDIR)/tags.mk &: $(POSTS) $(ALL_TAGS)
	@echo "[all-tags]"
	$(ALL_TAGS) $(POSTSDIR) $(TMPDIR)/all-tags.md $(TMPDIR)/tags.mk
build: $(BUILDDIR)/all-tags.html
include $(TMPDIR)/tags.mk

$(BUILDDIR)/%.html: $(POSTSDIR)/%.md $(POSTDEPS) ; $(call pandoc,post)
$(BUILDDIR)/%.html: $(TMPDIR)/%.md   $(POSTDEPS) ; $(call pandoc,meta)

define pandoc
  @echo "[pandoc] $<"
  mkdir -p $(dir $@)
  mkdir -p $(basename $@)
  LAANTAS_SCRIPT="$(LAANTAS_SCRIPT)" \
    DIRNAME="$(basename $@)" \
    FILENAME="$@" \
    pandoc -s --toc --template $(TEMPLATEDIR)/$(1).html -o $@ $< \
      --filter $(LANGFILTER) --filter $(NICE_DATE) --mathjax
endef


$(BUILDDIR)/%: $(POSTSDIR)/% ; $(copy)
$(BUILDDIR)/%: $(TMPDIR)/%   ; $(copy)
$(BUILDDIR)/%: %             ; $(copy)

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


BLOG_META_DEPS != find blog-meta -type f

$(LANGFILTER):     lang/langfilter/*     ; $(call cabal-exe)
$(LAANTAS_SCRIPT): lang/laantas-script/* ; $(call cabal-exe)
$(ALL_TAGS):       $(BLOG_META_DEPS)     ; $(call cabal-exe,blog-meta:)
$(POST_LISTS):     $(BLOG_META_DEPS)     ; $(call cabal-exe,blog-meta:)
$(NICE_DATE):      $(BLOG_META_DEPS)     ; $(call cabal-exe,blog-meta:)

define cabal-exe
  @echo "[build] $(notdir $@)"
  cabal build $(1)$(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: