#!/usr/bin/make -sf

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

# user variables
SITEURL := https://blog.danieliu.xyz
USERGLOBAL1 :=
USERGLOBAL2 :=

include config.mk

.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="$(SITEURL)"
	export ARTICLE_PATH="$(ARTICLE_PATH)"
	export USERGLOBAL1="$(USERGLOBAL1)"
	export USERGLOBAL2="$(USERGLOBAL2)"
endef

# usage: build_page [page_template] [item_template] [display_message]
define build_page
	echo "$(3)"
	$(export_common)
	cat $(TEMPLATE_DIR)/$(1) > "$@"
	for article_file in `ls $(SRC_DIR)`; do
		. ./$(MODULE_DIR)/md-header "$(SRC_DIR)/$$article_file"
		envsubst < $(TEMPLATE_DIR)/$(2) | sed -i "/<!-- $(shell echo $(addprefix _mount_,$(basename $(basename $(2)))) | tr '[:lower:]' '[:upper:]') -->/r /dev/stdin" "$(@)"
	done
	$(call expand_mount,$@)
	envsubst < "$@" | sponge "$@"
endef

# usage: expand_mount [filename]
define expand_mount
	for mount in `sed -En 's/<!-- MOUNT_(.+) -->/\1/p' "$(1)"`; do
		sed -i "/<!-- MOUNT_$$mount -->/r $(TEMPLATE_DIR)/`echo $$mount | tr '[:upper:]' '[:lower:]'`.template.html" "$(1)"
	done
endef

help:
	echo 'pinopress help|build|clean'

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

.ONESHELL:
$(BUILD_DIR)/rolling.html:
	$(call build_page,rollingpage.template.html,rollingitem.template.html,building rolling file)

.ONESHELL:
$(BUILD_DIR)/archive.html:
	$(call build_page,archivepage.template.html,archiveitem.template.html,building archive file)

.ONESHELL:
$(BUILD_DIR)/feed.xml:
	$(call build_page,feed.template.xml,feeditem.template.xml,building feed file)

.ONESHELL:
$(BUILD_DIR)/$(ARTICLE_PATH)/%.html: $(SRC_DIR)/%.md
	echo "parsing $<"
	$(export_common)
	cat $(TEMPLATE_DIR)/articlepage.template.html > "$@"
	# module pipeline starts here
	./$(MODULE_DIR)/md "$<" | sed -i "/<!-- _MOUNT_ARTICLECONTENT -->/r /dev/stdin" "$@"
	. ./$(MODULE_DIR)/md-header "$<"
	. ./$(MODULE_DIR)/readingtime "$<"
	# module pipeline ends here
	$(call expand_mount,$@)
	envsubst < "$@" | sponge "$@"

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