chapters := 01 02 03 04 05 06 07 08 09 10 11 12 appendix
edited_chapters := $(foreach chapter,$(chapters),edited/$(chapter).markdown)

book.pdf: $(edited_chapters) title.txt Makefile
	pandoc -o book.pdf title.txt $(edited_chapters) --table-of-contents --number-sections -V documentclass=book

edited/%.markdown: original/%.markdown edit-chapter.go Makefile
	go run edit-chapter.go $< $@

book.tex: $(edited_chapters) title.txt Makefile
	pandoc -o book.tex title.txt $(edited_chapters) --table-of-contents --number-sections -V documentclass=book