default: all
	# $^ -> finished $@ at $(shell date)

SOURCE_FILES := $(shell find . -type f | egrep -v '(cache|output|.doit.db|#)' )
NEWEST       := $(shell ls -t $(SOURCE_FILES) | head -1 )
LATEX_MAKEFILES := $(shell find latex -name Makefile)
LATEX_FOLDERS   := $(dir $(LATEX_MAKEFILES))
LATEX_TEX       := $(shell find $(LATEX_FOLDERS) -maxdepth 1 -name [^.]\*.tex)
LATEX_PDFS      := $(patsubst %.tex,%.pdf,$(LATEX_TEX))

newest:
	@echo ================ updated file: $(NEWEST)

all: latex output
	# $^ -> finished $@ at $(shell date)
clean: latex-clean
	rm -rfv output
	# $^ -> finished $@ at $(shell date)

serve: all
	cd output && python -m http.server
	# $^ -> finished $@ at $(shell date)

output: $(NEWEST)
	nikola build
	date > $@/sentinel
	touch $@
	# $^ -> finished $@ at $(shell date)

continuous: all
	while true ; do \
		$(MAKE) -q -s latex output || $(MAKE) newest all; \
		/bin/echo -n -e \\r $$(date +"%F %T.%N :") "" ; \
		sleep 1; \
	done
	# $^ -> finished $@ at $(shell date)

latex: $(LATEX_PDFS)
	touch $@
	# $^ -> finished $@ at $(shell date)
%.pdf : %.tex
	$(MAKE) -C $(dir $@)
	# $^ -> finished $@ at $(shell date)
latex-clean:
	$(foreach folder, $(LATEX_FOLDERS), $(MAKE) -C $(folder) clean;)
	# $^ -> finished $@ at $(shell date)