Makefile

install:
	sudo apt-get update && sudo apt-get upgrade -y
	sudo apt-get install -q -y \
		texlive-full \
		lyx \
		build-essential \
		python3-argcomplete \
		ubuntu-make

make_dest_dir:
	$(info    === Making a directory with the final PDFs if it doesn't exist.)
	[ -d pdfs ] || mkdir pdfs

clear_dest_dir:
	$(info    === Cleaning a directory with the final PDFs.)
	rm -f pdfs/*.pdf

make_pdfs:
	$(info    === Building PDFs.)
	FILES=`find lyx_books -name '[a-z-A-Z_-]*.lyx' -print`; \
	sudo lyx --export pdf4 $${FILES}

copy_pdfs:
	$(info    === Copying PDFs into the final directory '$(shell pwd)'.)
	FILES=`find lyx_books -name '[a-z-A-Z_-]*.pdf' -print`; \
	mv $${FILES} pdfs

all: make_dest_dir clear_dest_dir make_pdfs copy_pdfs