pandoc_sources := $(wildcard *.mkd)
presentations = $(pandoc_sources:%.mkd=%/index.html)

all: $(presentations)

# TODO: use --offline when working with Debian packaging of Pandoc
# FIXME: only add local stylesheet if it already exist in target dir
$(presentations): %/index.html : %.mkd %/local.css
	mkdir -p $(dir $@)
	pandoc --from Markdown --to Slidy -o $@ -s -c local.css $<
	perl -i -pe 's{https?://www.w3.org/Talks/Tools/Slidy2/(?:styles|scripts)/(slidy.(?:css|js))(?:\.gz)?}{../../../slidy/$$1}g' $@

%/local.css: $(firstword $(wildcard local.scss local.css) ../../slidy/local.css)
#%/local.css: local.scss
#%/local.css: $(wildcard local.scss)
	$(if $(filter %.scss,$<),\
		rm --force $@ && \
			sassc --load-path /usr/share/sass/stylesheets --style compressed $< $@,\
		ln --force --symbolic --target-directory=$* ../$<)