# This file is a so called Makefile. Execute it with make -f <filename>
# This Makefile removes the password (given by command line option) from all pdf files in the working directory

PDF_FILES = $(wildcard *.pdf)
INPUT_FILES = $(filter-out %_decrypt.pdf,$(PDF_FILES))
DECRYPT_PDF_FILES = $(patsubst %.pdf,%_decrypt.pdf,$(INPUT_FILES))
$(warning $(INPUT_FILES))

ifdef passwd
all: $(DECRYPT_PDF_FILES)

%_decrypt.pdf: %.pdf
	qpdf --password=$(passwd) --decrypt $< $@

else
all:
	@echo -e "ERROR: Specify password, with\n\tmake passwd=<password> all" 1>&2
endif

clean:
	rm -f $(DECRYPT_PDF_FILES)