SHELL = /bin/sh
.SUFFIXES:

# functions for links, pages, and parts, take a list of sources as the only
# argument
getlinks = $(shell pandoc lua pandoc/links.lua $(1))
getpages = $(patsubst %.md,public_html/%.html,$(1))
getparts = $(patsubst %.md,public_html/%.html.part,$(1))

.PHONY: all
all: public_html/index.html $(call getpages,$(call getlinks,--follow index.md))

public_html/index.html: public_html/index.html.part $(call getparts,$(call getlinks,index.md))

.SECONDEXPANSION:
public_html/%.html: public_html/%.html.part $$(call getparts,$$(call getlinks,%.md)) public_html/index.html.part
	pandoc --data-dir pandoc -d bavbavhaus.net.yaml -M slug=$* -M bodypart=$< $(patsubst %,-M linkparts=%,$(filter-out $<,$^)) -o $@ $*.md

public_html/%.html.part: %.md
	pandoc --data-dir pandoc -d bavbavhaus.net.part.yaml -M url=$*.html --id-prefix $* -o $@ $<

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