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export DEPLOY_TARGET = vulpes@94.130.78.123:/srv/http/volpeon.ink/

-include Env.mk

#
# FILE GROUPS
#

PANDOC_FILTERS        := $(patsubst %,--lua-filter %,$(wildcard filters/*.lua))
GLOBAL_METADATA       := $(patsubst %,--metadata-file %,$(wildcard metadata/*.yaml))

CONTENT_SRC           := $(shell find content -type f -name "*.md")
FEED_SRC              := $(shell grep -l "^feed: *true$$" $(CONTENT_SRC))
CONTENT_TEMPLATES_SRC := $(shell find templates -type f -name "*.html")
FEED_TEMPLATES_SRC    := $(shell find templates -type f -name "*.xml")
CSS_SRC               := $(shell find assets/css -type f -name "*.scss")

CONTENT_META          := $(patsubst content/%.md,.cache/meta/%.json,$(CONTENT_SRC))
CONTENT_FILES         := $(patsubst content/%.md,out/%.html,$(CONTENT_SRC))
FEED_FILES            := $(patsubst content/%.md,out/%.xml,$(FEED_SRC))
FONT_FILES            := $(patsubst assets/fonts/%.ttf,out/%.woff2,$(wildcard assets/fonts/*.ttf))
CSS_FILES             := $(patsubst assets/css/%.scss,out/%.css,$(wildcard assets/css/style.scss))
STATIC_FILES          := $(patsubst content/%,out/%,$(shell find content -type f ! -name "*.md"))
ASSET_FILES           := $(FONT_FILES) $(CSS_FILES) out/icons.svg $(patsubst content/%,out/%,$(shell find content -maxdepth 1 -type f ! -name "*.md"))

#
# TARGETS
#

all: content_meta content_files feed_files font_files css_files static_files

content_meta:  $(CONTENT_META)
content_files: $(CONTENT_FILES)
feed_files:    $(FEED_FILES)
font_files:    $(FONT_FILES)
css_files:     $(CSS_FILES)
static_files:  $(STATIC_FILES)

#
# RULES
#

.SECONDEXPANSION:

namespace = $(patsubst %/index,%,$(patsubst %.json,%,$(patsubst $(2)%,%,$(1))))

subpages = $(patsubst content/%.md,.cache/meta/%.json, \
	$(shell test -d $(patsubst .cache/meta%,content%,$(1)) && find $(patsubst .cache/meta%,content%,$(1)) -maxdepth 1 -type f -name "*.md" ! -name "index.md") \
	$(shell test -d $(patsubst .cache/meta%,content%,$(1)) && find $(patsubst .cache/meta%,content%,$(1)) -mindepth 2 -maxdepth 2 -type f -name "index.md"))

.cache/meta/%.json: content/%.md $$(call subpages,$$(call namespace,$$@,)) filters/*.lua scripts/subpages.lua scripts/subpages.jq scripts/metadata_tpl.json | .cache/meta
	$(info [META] $< -> $@)
	
	mkdir -p $(@D)
	$(eval PAGES_FILES = $(filter .cache/meta/%.json,$^))
	$(eval NAMESPACE = $(call namespace,$@,.cache/meta))
	$(if $(PAGES_FILES),jq -s --arg namespace "$(NAMESPACE)" -f scripts/subpages.jq $(PAGES_FILES) > "$@.pages",echo "{}" > "$@.pages")
	pandoc \
		-f markdown-citations-implicit_figures \
		-t html5 \
		--wrap preserve \
		--no-highlight \
		--template scripts/metadata_tpl.json \
		--metadata namespace="$(NAMESPACE)" \
		--metadata file_out="$(patsubst .cache/meta/%.json,out/%.html,$@)" \
		--metadata-file "$@.pages" \
		$(PANDOC_FILTERS) \
		-o "$@.meta" "$<"
	rm "$@.pages"
	pandoc \
		-f markdown-citations-implicit_figures \
		-t html5 \
		--wrap preserve \
		--lua-filter scripts/metadata_filter.lua \
		--lua-filter scripts/subpages.lua \
		$(GLOBAL_METADATA) \
		--metadata-file "$@.meta" \
		--metadata file_out="$@" \
		$(PANDOC_FILTERS) \
		-o "$@.content" "$<"
	jq '. + { content: $$content }' --rawfile content "$@.content" "$@.meta" > "$@"
	rm "$@.meta"
	rm "$@.content"

.cache/assets.json: $(ASSET_FILES) | .cache
	sha256sum $^ | sed -r 's/([0-9a-f]+) +out\/(.*)/{ "\2": "\/\2?\1" }/' | jq '{ assets: [inputs] | add | with_entries( .key |= gsub( "\\."; "_") ) }' > "$@"

out/%.html: content/%.md .cache/meta/%.json .cache/assets.json $(CONTENT_TEMPLATES_SRC) metadata/*.yaml filters/*.lua scripts/metadata_filter.lua | out
	$(info [MARK] $< -> $@)
	
	mkdir -p $(@D)
	pandoc \
		-f markdown-citations-implicit_figures \
		-t html5 \
		--wrap preserve \
		--no-highlight \
		--template templates/base.html \
		--lua-filter scripts/metadata_filter.lua \
		$(GLOBAL_METADATA) \
		--metadata-file .cache/assets.json \
		--metadata-file "$(filter .cache/meta/%.json,$^)" \
		--metadata file_out="$@" \
		$(PANDOC_FILTERS) \
		-o "$@" "$<"

out/%.xml: content/%.md .cache/meta/%.json $(FEED_TEMPLATES_SRC) metadata/*.yaml filters/*.lua scripts/metadata_filter.lua | out
	$(info [FEED] $< -> $@)
	
	mkdir -p $(@D)
	pandoc \
		-f markdown-citations-implicit_figures \
		-t html5 \
		--wrap preserve \
		--no-highlight \
		--template templates/feed.xml \
		--lua-filter scripts/metadata_filter.lua \
		$(GLOBAL_METADATA) \
		--metadata-file "$(filter .cache/meta/%.json,$^)" \
		--metadata file_out="$@" \
		$(PANDOC_FILTERS) \
		-o "$@" "$<"

out/%/thumbnail.png: content/%/thumbnail.png | out
	$(info [THMB] $< -> $@)

	convert -thumbnail 550x280^ -gravity center -extent 550x280 "$<" png:- | pngquant -o "$@" -

out/%/thumbnail.jpg: content/%/thumbnail.jpg | out
	$(info [THMB] $< -> $@)

	convert -thumbnail 550x280^ -gravity center -extent 550x280 "$<" ppm:- | cjpeg -quality 80 > "$@"

out/%.woff2: assets/fonts/%.ttf assets/fonts/glyphs.txt | out
	$(info [FONT] $< -> $@)
	
	pyftsubset "$<" \
		--text-file="assets/fonts/glyphs.txt" \
		--layout-features+=ss09,dlig \
		--flavor="woff2" \
		--output-file="$@"

out/%.css: assets/css/%.scss $(CSS_SRC) | out
	$(info [SCSS] $< -> $@)

	sass --load-path=node_modules "$<" | ./node_modules/.bin/postcss --use autoprefixer --no-map -o "$@"

out/icons.svg: | out
	$(info [ICON] $@)

	node ./node_modules/iro-icons/scripts/create_sprite.js \
		asterisk \
		arrow-left \
		arrow-right \
		arrow-up-right \
		shuffle \
		envelope \
		hash \
		messages \
		parallelogram \
		globe \
		image \
		graph \
		git-branch \
		smile \
		link \
		x \
		chevron-left \
		chevron-right \
		"$@"

out/%: content/% | out
	$(info [COPY] $< -> $@)

	mkdir -p $(@D)
	cp "$<" "$@"

.cache/hash: | .cache
	mkdir -p .cache/hash

.cache/meta: | .cache
	mkdir -p .cache/meta

.cache:
	mkdir -p .cache

out:
	mkdir -p out

#
# UTILITIES
#

watch: all
	while true; do \
		inotifywait -qr -e modify -e create -e delete -e move assets content filters metadata scripts templates; \
		$(MAKE); \
	done

serve: all
	python -m http.server --bind 127.0.0.1 --directory out 8000

dev: watch serve

compress: all
	pigz -R -k -9 -- `find out -type f -iregex '.*\\.\\(css\\|js\\|json\\|html\\|xml\\|txt\\|svg\\|ico\\)'` 
	brotli -k -- `find out -type f -iregex '.*\\.\\(css\\|js\\|json\\|html\\|xml\\|txt\\|svg\\|ico\\|woff\\)'`

deploy: compress
	rsync --progress --stats -rvz --delete out/ "$(DEPLOY_TARGET)"

clean:
	rm -rf out

.PHONY: all watch serve dev deploy clean