SHELL = /bin/sh
.SUFFIXES:

# All notes referenced with internal links, starting from `index.md`.
NOTES = $(shell pandoc lua pandoc/collect_notes.lua index.md)
# All pages referenced with internal links, starting from `index.md`.
PAGES := $(patsubst %.md,public_html/%.html,$(NOTES))
# All parts referenced with internal links in `$(1)`, plus the sitemap.
PARTS = $(patsubst %.md,public_html/%.html.part,$(shell pandoc lua pandoc/collect_links.lua $(1))) public_html/sitemap.html.part

PANDOCFLAGS = --data-dir pandoc

.PHONY: all
all: $(PAGES)

.SECONDEXPANSION:
public_html/%.html: flags = $(patsubst %,-M parts=%,$(filter-out $<,$^))
public_html/%.html: %.md $$(call PARTS,%.md)
	@echo $^
	pandoc $(PANDOCFLAGS) -d bavbavhaus.net.yaml -M slug=$* $(flags) -o $@ $<

.SECONDARY:
public_html/%.html.part: %.md
	pandoc $(PANDOCFLAGS) -d bavbavhaus.net.part.yaml --id-prefix $* -M url=$*.html -M slug=$* -o $@ $<

public_html/sitemap.html.part: $(NOTES)
	pandoc lua pandoc/sitemap.lua index.md $@

dest/%.docx: %.md
	test -d dest || mkdir dest
	pandoc --data-dir pandoc --resource-path pandoc -d docx.yaml -o $@ $<

.PHONY: clean
clean:
	$(RM) public_html/*.html.part
	$(RM) public_html/*.html
	$(RM) -r dest