#!/usr/bin/make -sf

## pinopress - the simple static blog generator
## dependencies: sponge

# user variables
SITEURL := https://blog.danieliu.xyz
USERVAR1 :=
USERVAR2 :=

.PHONY: help build clean

# internal variables
TEMPLATE_DIR := templates
BUILD_DIR := build
SRC_DIR := articles
MODULE_DIR := modules

ARTICLE_PATH := article
ARTICLE_LIST := $(basename $(shell ls $(SRC_DIR)))

# some helper functions
define export_common
	export SITEURL="$(SITEURL)"
	export USERVAR1="$(USERVAR1)"
	export USERVAR2="$(USERVAR2)"
endef

# usage: export_article [input md]
define export_article
	export ARTICLE_TITLE=`./$(MODULE_DIR)/md-header "$(1)" name`
	export PUBLISHED_DATE=`./$(MODULE_DIR)/md-header "$(1)" published`
	# vvv this is sorta ugly vvv
	export ARTICLE_URL="$(SITEURL)/$(ARTICLE_PATH)/$(subst .md,.html,$(notdir "$(1)"))"
endef

help:
	echo 'pinopress help|build|clean'

build: $(BUILD_DIR)/rolling.html $(BUILD_DIR)/archive.html $(addprefix $(BUILD_DIR)/$(ARTICLE_PATH)/,$(addsuffix .html,$(ARTICLE_LIST)))

.ONESHELL:
$(BUILD_DIR)/rolling.html:
	echo 'building rolling file'
	$(export_common)
	cat $(TEMPLATE_DIR)/head.template.html $(TEMPLATE_DIR)/rollingbody.template.html $(TEMPLATE_DIR)/foot.template.html > "$@"
	for article_file in `ls $(SRC_DIR)`; do
		$(call export_article,"$(SRC_DIR)/$$article_file")
		envsubst < $(TEMPLATE_DIR)/rollingitem.template.html | sed -i "/<!-- ROLLING_ITEMS -->/r /dev/stdin" "$@"
	done
	envsubst < "$@" | sponge "$@"

.ONESHELL:
$(BUILD_DIR)/archive.html:
	echo 'building archive file'
	$(export_common)
	cat $(TEMPLATE_DIR)/head.template.html $(TEMPLATE_DIR)/archivebody.template.html $(TEMPLATE_DIR)/foot.template.html > "$@"
	envsubst < "$@" | sponge "$@"

.ONESHELL:
$(BUILD_DIR)/$(ARTICLE_PATH)/%.html: $(SRC_DIR)/%.md
	echo "parsing $<"
	$(export_common)
	$(call export_article,"$<")
	cat $(TEMPLATE_DIR)/head.template.html > "$@"
	# module pipeline starts here
	./$(MODULE_DIR)/md "$^" >> "$@"
	# module pipeline ends here
	cat $(TEMPLATE_DIR)/foot.template.html >> "$@"
	envsubst < "$@" | sponge "$@"

clean:
	echo 'cleaning...'
	rm $(BUILD_DIR)/rolling.html $(BUILD_DIR)/archive.html $(BUILD_DIR)/$(ARTICLE_PATH)/*