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.PHONY: all assets clean deploy help tree check-git-clean check-links

SRC := md
OUT := out
HEAD := tpl/head.html
FOOT := tpl/foot.html
CSS := tpl/style.css
MD2HTML ?= /usr/bin/cmark-gfm
CMARK_FLAGS := --to html --extension table --validate-utf8 --unsafe
PYTHON ?= python3
BUILDINFO := tools/buildinfo.py
BUILD_PAGE := tools/build_page.py
GEN_INDEX := tools/gen_index.py
INDEX_HTML := $(OUT)/Index.html
DEPLOY_HOST ?= arsien23i2@dreamhost:tailrecursion.com/~alan

MD_FILES := $(shell find $(SRC) -type f -name '*.md' | LC_ALL=C sort)
HTML := $(patsubst $(SRC)/%.md,$(OUT)/%.html,$(MD_FILES))

all: assets $(OUT)/style.css $(HTML) $(INDEX_HTML)

$(OUT)/style.css: $(CSS)
	mkdir -p $(OUT)
	cp $(CSS) $@

$(OUT):
	mkdir -p $(OUT)

$(OUT)/%.html: $(SRC)/%.md $(HEAD) $(FOOT) tools/mdlink2html.py $(BUILD_PAGE) $(BUILDINFO) | $(OUT)
	OUT_DIR="$(OUT)" MD2HTML="$(MD2HTML)" CMARK_FLAGS="$(CMARK_FLAGS)" \
	$(PYTHON) $(BUILD_PAGE) "$@" "$<" "$(HEAD)" "$(FOOT)" tools/mdlink2html.py

assets:
	mkdir -p $(OUT)
	rsync -a --include='*/' --exclude='*.md' --exclude='*.MD' --prune-empty-dirs $(SRC)/ $(OUT)/

$(INDEX_HTML): $(HTML) $(GEN_INDEX) $(HEAD) $(FOOT) $(BUILDINFO) | $(OUT)
	$(PYTHON) $(GEN_INDEX) $@ $(SRC)

deploy: check-git-clean assets all
	@if [ -z "$(DEPLOY_HOST)" ]; then \
		echo "DEPLOY_HOST is not set"; \
		exit 1; \
	fi
	rsync -a --chmod=F644,D755 $(OUT)/ $(DEPLOY_HOST)
	git push

tree:
	printf 'Markdown sources: ' && find $(SRC) -type f -name '*.md' | wc -l
	printf 'HTML outputs:   ' && if [ -d $(OUT) ]; then find $(OUT) -type f -name '*.html' | wc -l; else echo 0; fi

clean:
	rm -rf $(OUT)

help:
	@echo 'Static site generator targets:'
	@echo '  make assets   - copy non-Markdown assets into $(OUT)/'
	@echo '  make          - build HTML pages (same as make all)'
	@echo '  make deploy   - rsync $(OUT)/ to $$DEPLOY_HOST'
	@echo '  make tree     - count source and generated files'
	@echo '  make clean    - remove $(OUT)/'
	@echo '  (deploy refuses to run with a dirty git worktree)'

check-git-clean:
	@if [ -n "$$(git status --porcelain)" ]; then \
		echo 'Refusing to build: git worktree has uncommitted changes.'; \
		git status --short; \
		exit 1; \
	fi

check-links:
	@python3 tools/check_links.py