split makefiles, added empty page template

Makefile

@@ -1,46 +1,26 @@
-.PHONY: all 
-tex_deps = build variables.tt library/*/*/*.tt song_choices.csv song_template.tt propers/*.tt purpose_processing.tt
 docker = podman
-all: leadsheet_collection.pdf print_a3.pdf print_a4.pdf clean_intermediate
-%.pdf: %.tex
-	cd build && \
-	lualatex --shell-escape $<
-print_a3.pdf: songsheet_a3part.pdf
-	cd build && \
-	pdftk A=$< B=$< shuffle A B output -  | pdfjam -o a4.pdf --nup 1x2 --paper a4paper --clip true /dev/stdin && \
-	pdfbook2 --paper a3paper -s -n -o 0 -i 0 -t 0 -b 0 a4.pdf && \
-	mv a4-book.pdf print_a3.pdf && \
-	rm a4.pdf
-print_a4.pdf: songsheet_a4part.pdf
-	cd build && \
-	pdftk A=$< B=$< shuffle A B output - | pdfjam -o $@ --nup 1x2 --paper a4paper /dev/stdin;
-songsheet_a3part.pdf: songsheet_a5.pdf
-	cd build && \
-	pdftk $< cat ~3-4 output $@
-#	cp $< $@
-songsheet_a4part.pdf: songsheet_a5.pdf
-#	cp $< $@
-# Uncomment this if songsheet.pdf has 12 pages or less, and you want to use an a4 sheet inside a folded a3 sheet
-	cd build && \
-	pdftk $< cat 3-4 output $@
-songsheet_a5.pdf: songsheet.pdf
-	cd build && \
-	pdfjam -o $@ --nup 2x1 --paper a5paper --landscape $<
+build_dir = build
+tex_deps = variables.tt library/*/*/*.tt song_choices.csv song_template.tt empty_page_template.tt propers/*.tt purpose_processing.tt
+.PHONY: all 
+.PRECIOUS: %.tex
+all: leadsheet_collection.pdf choir_scores.pdf print_a3.pdf clean_intermediate #print_a4.pdf
+%.pdf: build
+	$(MAKE) -C $(build_dir) $@
 songsheet.tex: songsheet.tt $(tex_deps) header.tt head.tt footer.tt
-	tpage $< > build/$@
+	tpage $< > $(build_dir)/$@
 musician_scores.tex: musician_scores.tt $(tex_deps)
-	tpage $< > build/$@
+	tpage $< > $(build_dir)/$@
 leadsheet_collection.tex: musician_scores.tt $(tex_deps)
-	tpage --define parts=band $< > build/$@
-chornoten.tex: musician_scores.tt $(tex_deps)
-	tpage --define parts=choir $< > build/$@
+	tpage --define parts=band $< > $(build_dir)/$@
+choir_scores.tex: musician_scores.tt $(tex_deps)
+	tpage --define parts=SATB $< > $(build_dir)/$@
 clean_intermediate:
-	cd build && \
-	rm songsheet_a3part.pdf songsheet_a4part.pdf songsheet_a5.pdf
-build:
-	mkdir build
+	$(MAKE) -C $(build_dir) clean_intermediate
+build: build-Makefile
+	mkdir -p $(build_dir) && \
+	cp build-Makefile $(build_dir)/Makefile
 clean:
-	rm -r build
+	$(RM) -r build
 init:
 	git submodule update --init --recursive
 build_docker_image: