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

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

STATICS != find $(IMAGESDIR) -type f

POSTS != find $(POSTSDIR) -name '*.md'
OUTPUTPOSTS = \
  $(patsubst $(POSTSDIR)/%.md,$(BUILDDIR)/%.html,$(POSTS)) \
  $(addprefix $(BUILDDIR)/,$(STATICS)) \
  $(BUILDDIR)/index.html $(BUILDDIR)/rss.xml

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

OUTPUT = $(OUTPUTPOSTS) $(OUTPUTSTYLE)

ALL_TAGS = $(TMPDIR)/all-tags
POST_LISTS = $(TMPDIR)/post-lists
NICE_DATE = $(TMPDIR)/nice-date
SLUG_TAGS = $(TMPDIR)/slug-tags
EXECS = \
  $(LAANTAS_SCRIPT) \
  $(ALL_TAGS) $(POST_LISTS) $(NICE_DATE) $(SLUG_TAGS)

CABAL_FLAGS ?= -O

SYNTAXDIR := syntax
SYNTAXFILES != find $(SYNTAXDIR) -name *.xml
SYNTAXFLAGS = $(patsubst %,--syntax-definition=%,$(SYNTAXFILES))

.PHONY: all
all: build

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


LANGFILTER != cabal list-bin langfilter
LAANTAS_SCRIPT != cabal list-bin laantas-script

POSTDEPS = \
  $(TEMPLATEDIR)/* \
  langfilter laantas-script \
  $(SYNTAXFILES) acm.csl quox.bib

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

$(BUILDDIR)/rss.xml: $(TMPDIR)/index.md $(POSTDEPS)
	$(call pandoc,rss.xml,--metadata-file rss.yaml --write html)

.PHONY: langfilter laantas-script
langfilter laantas-script: %: ; cabal build $@

# $(1): template file
# $(2): extra flags
define pandoc
  @echo "[pandoc] $(subst $(TMPDIR)/,,$(subst $(BUILDDIR)/,,$@))"
  mkdir -p $(dir $@)
  mkdir -p $(basename $@)
  LAANTAS_SCRIPT="$(LAANTAS_SCRIPT)" LANG_COLOR="#325" \
    DIRNAME="$(basename $@)" \
    FILENAME="$@" \
    pandoc -s --toc --toc-depth=2 --template $(TEMPLATEDIR)/$(1) -o $@ $< \
      -f markdown+emoji $(2) \
      $(SYNTAXFLAGS) \
      --filter $(LANGFILTER) --filter $(NICE_DATE) --filter $(SLUG_TAGS) \
      --mathml --citeproc --csl=apa-eu.csl
endef


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

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


BLOG_META_DEPS != find blog-meta -type f

$(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:)
$(SLUG_TAGS):  $(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: