DEST_DIR ?= dist
ISSUES != find . -path "./issues/*" -type d
DEST_PDF_FILES := $(ISSUES:./issues/%=$(DEST_DIR)/issue-%.pdf)
DEST_HTML_FILES := $(ISSUES:./issues/%=$(DEST_DIR)/issue-%.html)
DEST_EPUB_FILES := $(ISSUES:./issues/%=$(DEST_DIR)/issue-%.epub)

PANDOC != command -v pandoc 2> /dev/null

all: $(DEST_PDF_FILES) $(DEST_HTML_FILES) $(DEST_EPUB_FILES)

$(DEST_DIR)/issue-%.pdf: issues/%
	@echo "building $@"
	@$(PANDOC) \
		--file-scope \
		--from markdown \
		--to latex \
		--pdf-engine xelatex \
		--table-of-contents \
		--variable title:"tildeverse zine $@" \
		--standalone \
		--output $@ \
		$</*.md

$(DEST_DIR)/issue-%.html: issues/%
	@echo "building $@"
	@$(PANDOC) \
		--file-scope \
		--from markdown \
		--to html \
		--standalone \
		--table-of-contents \
		--lua-filter header-permalinks.lua \
		--lua-filter increase-header-levels.lua \
		--metadata title:"tildeverse zine $@" \
		--variable include-before:"<div class=\"container\">" \
		--variable include-after:"</div>" \
		--css https://tilde.team/css/hacker.css \
		--output $@ \
		$</*.md

$(DEST_DIR)/issue-%.epub: issues/%
	@echo "building $@"
	@$(PANDOC) \
		--file-scope \
		--from markdown \
		--to epub \
		--standalone \
		--table-of-contents \
		--lua-filter increase-header-levels.lua \
		--metadata title:"tildeverse zine $@" \
		--output $@ \
		$</*.md

clean:
	@echo "removing build artifacts"
	@rm $(DEST_PDF_FILES) $(DEST_HTML_FILES) $(DEST_EPUB_FILES)

.PHONY: clean