NUM_LINKS_TO_SHOW=		100
PARALLEL_DOWNLOADS=		8


.PHONY: default
default: get-feeds build


.PHONY: build
build: index.gmi

.PHONY:deploy
deploy:
	printf 'cd emilis\nput index.gmi\n' \
		| sftp -b - gemini.circumlunar.space


.PHONY: get-feeds
get-feeds:
	rm downloaded.gmi
	@make sorted.gmi

.PHONY: test-feed
test-feed:
	@echo 'Current feeds.txt:'
	cat feeds.txt
	cp -i feeds.txt backup-feeds.txt
	cp -i test-feed.txt feeds.txt
	@make default
	cp backup-feeds.txt feeds.txt


index.gmi: \
	header.gmi \
	sorted.gmi \
	footer.gmi \

	> "$@"
	cat header.gmi > "$@"
	awk '\
		BEGIN { \
			D=""; \
			T=""; \
		} { \
			if(D!=substr($$3, 0, 10)) { \
				D=substr($$3, 0, 10); \
				T="\n### "D"\n"; \
				printf "%s", T; \
			} \
			$$3=""; \
			print \
		}' sorted.gmi \
		| tee -a "$@"
	cat footer.gmi >> "$@"
	date +'Updated: %FT%T%:z' >> "$@"


sorted.gmi: downloaded.gmi
	cat "$<" | sort -k 3 -r | uniq | head -${NUM_LINKS_TO_SHOW} > "$@"


downloaded.gmi: feeds.txt
	> "$@"
	xargs -a feeds.txt -P ${PARALLEL_DOWNLOADS} -n 1 -I {} bash -c '\
		TMP_FILE=$$(mktemp); \
		URL="{}"; \
		BASE_URL=$$( echo $$URL | grep -oE ".+/" ); \
		echo "BASE_URL: $$BASE_URL"; \
		echo "DOWNLOADING: $$DOMAIN $$URL into $$TMP_FILE"; \
		./gcat "$$URL" \
			| tee $$TMP_FILE; \
		TITLE=$$(grep -s -m 1 -E "^# " $$TMP_FILE | cut -c 3- | sed "s/\r//g" ); \
		echo "TITLE: $$TITLE"; \
		echo "full urls:"; \
		grep -hsE "^=>\s*\S+\s+[0-9]{4}-[0-9]{2}-[0-9]{2}(T[0-9]{2}:[0-9]{2}(:[0-9]{2})?(Z|\+[0-9]{1,2}:[0-9]{2}))?\s+\S.*$$" $$TMP_FILE \
			| grep -sE "^=>\s*gemini://" \
			| awk "{ if(\"$$TITLE\"){ \$$4= \"$$TITLE - \" \$$4; } print }" \
			| tee -a "$@"; \
		echo "slash urls:"; \
		grep -hsE "^=>\s*\S+\s+[0-9]{4}-[0-9]{2}-[0-9]{2}(T[0-9]{2}:[0-9]{2}(:[0-9]{2})?(Z|\+[0-9]{1,2}:[0-9]{2}))?\s+\S.*$$" $$TMP_FILE \
			| grep -hsE "^=>\s*/" \
			| sed -E -e "s#^=>[ ]*/#=> $${BASE_URL}#g" \
			| awk "{ if(\"$$TITLE\"){ \$$4= \"$$TITLE - \" \$$4; } print }" \
			| tee -a "$@"; \
		echo "no-slash urls:"; \
		grep -hsE "^=>\s*\S+\s+[0-9]{4}-[0-9]{2}-[0-9]{2}(T[0-9]{2}:[0-9]{2}(:[0-9]{2})?(Z|\+[0-9]{1,2}:[0-9]{2}))?\s+\S.*$$" $$TMP_FILE \
			| grep -hsvE "^=>\s*gemini://" \
			| grep -hsvE "^=>\s*/" \
			| sed -E -e "s#^=>[ ]*#=> $${BASE_URL}#g" \
			| awk "{ if(\"$$TITLE\"){ \$$4= \"$$TITLE - \" \$$4; } print }" \
			| tee -a "$@"; \
		rm $$TMP_FILE; \
		'