HOST ?= niss.website
REMOTE_USER ?= www-data
REMOTE_DIR ?= blog

TMPDIR      ?= _tmp
BUILDDIR    ?= /srv/www/blog
POSTSDIR    ?= posts
IMAGESDIR   ?= images
TEMPLATEDIR ?= templates

STATICS := \
  $(subst $(POSTSDIR)/,, $(shell find $(POSTSDIR) -type f -not -iname '*.md')) \
  $(shell 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 = $(patsubst %.scss,%.css,$(patsubst %,$(BUILDDIR)/%,$(STYLE)))

SCRIPT != find script -type f
OUTPUTSCRIPT = $(patsubst %.ts,%.js,$(patsubst %,$(BUILDDIR)/%,$(SCRIPT)))

OUTPUT = $(OUTPUTPOSTS) $(OUTPUTSTYLE) $(OUTPUTSCRIPT)

ALL_TAGS = $(TMPDIR)/all-tags
POST_LISTS = $(TMPDIR)/post-lists
COMBO_FILTER = $(TMPDIR)/combo-filter
EXECS = $(ALL_TAGS) $(POST_LISTS) $(COMBO_FILTER)

CABAL_FLAGS ?= -O

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

.PHONY: all
all: build

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

POSTDEPS = \
  $(TEMPLATEDIR)/* \
  $(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-simple,meta.html)

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

$(BUILDDIR)/%.css: %.scss
	@echo "[sass]" $@
	mkdir -p $(dir $@)
	sass --no-source-map -I style $< $@

$(BUILDDIR)/%.js: %.ts
	@echo "[tsc]" $@
	mkdir -p $(dir $@)
	tsc --strict --noUncheckedIndexedAccess --noEmitOnError \
	    --lib dom,es2021 --target es2015 \
	    --outDir $(dir $@) $^

# $(1): template file
# $(2): extra flags
define pandoc
  @echo "[pandoc] $(subst $(TMPDIR)/,,$(subst $(BUILDDIR)/,,$@))"
  mkdir -p $(dir $@)
  mkdir -p $(basename $@)
  LANG_COLOR="currentcolor" \
    pandoc -s --toc --toc-depth=2 --template $(TEMPLATEDIR)/$(1) -o $@ $< \
      -f markdown+emoji $(2) \
      -M filename=$(subst $(BUILDDIR)/,,$@) --metadata-file=rss.yaml \
      $(SYNTAXFLAGS) --filter $(COMBO_FILTER) \
      --mathml --citeproc --csl=apa-eu.csl
endef

# $(1): template file
define pandoc-simple
  @echo "[pandoc] $(subst $(TMPDIR)/,,$(subst $(BUILDDIR)/,,$@))"
  mkdir -p $(dir $@)
  mkdir -p $(basename $@)
  pandoc -s --template $(TEMPLATEDIR)/$(1) -o $@ $< \
    -M filename=$(subst $(BUILDDIR)/,,$@) --metadata-file=rss.yaml
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:)
$(COMBO_FILTER): $(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 \
	       --delete --delete-after \
	       --rsh='ssh -l $(REMOTE_USER)' \
	       $(BUILDDIR)/ $(HOST):$(REMOTE_DIR)/



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

.SILENT: