SHELL = /bin/sh
.SUFFIXES:

# collect notes, sorted by time
notes := $(wildcard $(shell ls -t *.md))
# functions for pages and parts, takes a list of notes as the only argument
getpages = $(patsubst %.md,public_html/%.html,$(1))
getparts = $(patsubst %.md,partials/%.html,$(1))
# collect orphans
orphans = $(filter-out \
	  $(call getpages,$(notes)),\
	  $(wildcard public_html/*.html) $(wildcard public_html/.*.html))

.PHONY: all
all: $(call getpages,$(notes))
	$(if $(orphans),$(RM) $(orphans))

.PHONY: hidden
hidden: notes := $(wildcard $(shell ls -t .*.md *.md))
hidden: all

public_html/%.html: %.md sitemap.json links.json
	$(eval deps := $(shell jq -r '.["$<"] | unique | join(" ")' links.json))
	$(if $(deps), $(MAKE) $(call getparts,$(deps)))
	pandoc \
		--data-dir pandoc \
		--defaults bavbavhaus.net.yaml \
		--template bavbavhaus.net.html5 \
		--metadata url=$< \
		--lua-filter insert_sitemap.lua \
		--lua-filter insert_links.lua \
		--lua-filter update_internal_targets.lua \
		--output $@ \
		$<

# preserve `partials/%.html` intermediate files
.PRECIOUS: partials/%.html
partials/%.html: %.md | partials
	pandoc \
		--data-dir pandoc \
		--defaults bavbavhaus.net.yaml \
		--template bavbavhaus.net.inline.html5 \
		--id-prefix $< \
		--metadata url=$< \
		--lua-filter update_internal_targets.lua \
		--output $@ \
		$<

# create `partials` directory if it doesn't exist
partials:
	test -d $@ || mkdir $@

# generate `sitemap.json`
sitemap.json: FORCE
	pandoc lua pandoc/sitemap.lua $@ $(notes)

# generate `links.json`
links.json: FORCE
	pandoc lua pandoc/links.lua $@ $(notes)

FORCE: ;

# clean all targets
.PHONY: clean
clean:
	$(RM) $(patsubst %.md,public_html/%.html,$(notes))
	$(RM) sitemap.json links.json
	$(RM) -r partials

# # dest
# .PHONY: dest
# dest:
# 	test -d "dest" || mkdir "dest"
# 
# # docx
# dest/%.docx: notes/%.md\
# 	     pandoc/defaults/docx.yaml\
# 	     pandoc/reference-sl.docx\
# 	     pandoc/csl/chicago-fullnote-sl.csl\
# 	     pandoc/filters/pandoc-quotes.lua\
# 	     pandoc/filters/delink.lua\
# 	     | dest
# 	pandoc --data-dir=pandoc -ddocx -o $@ $<
# 
# # pdf
# dest/%.pdf: notes/%.md\
# 	    pandoc/defaults/pdf.yaml\
# 	    pandoc/csl/chicago-fullnote-sl.csl\
# 	    | dest
# 	pandoc --data-dir=pandoc -dpdf -o $@ $<
# 
# # presentation
# dest/%.s5.html: notes/%.md\
# 		pandoc/defaults/s5.yaml\
# 		pandoc/templates/default.s5\
# 		pandoc/s5/default/pretty.css\
# 		pandoc/s5/default/framing.css\
# 		pandoc/csl/chicago-fullnote-sl.csl\
# 	        pandoc/filters/pandoc-quotes.lua\
# 		| dest
# 	pandoc --data-dir=pandoc -ds5 -o $@ $<