# Static site builder
#
# It allows for the creation a diary and a blog.
# It follows pretty "unixy" way to articulate the build.
# It uses Pandoc, Python3 and POSIX Commands
#

SRC_DIR := src
DIARY_DIR := src/diary
BLOG_DIR := src/blog
BUILD_DIR := build


# Commands Configuration
BLOG_ENTRIES_LIST := .entries.csv
SORT := sort -r
# Utility Function
ESCAPE_PATH = $(shell echo $(1) | sed 's/\//\\\//g')

# Pandoc basic configuration
PANDOC := pandoc -s
PANDOC_FILTERS := 

PANDOC_METADATA = \
 --section-divs \
 --template=templates/default.html \
 --metadata-file metadata.yaml \
 --metadata=blog_entries_list:"$(BLOG_ENTRIES_LIST)" \
 --metadata=path="$(shell echo $@ | sed -e 's/build//g' )" \
 --metadata=git_initial_date="$(shell git log --reverse -n 1 --pretty=format:%aI -- $< || echo 'draft')" \
 --metadata=git_date="$(shell git log -n 1 --pretty=format:%aI -- $< || echo 'draft')" 

PANDOC_COMMAND = $(PANDOC) $(PANDOC_FILTERS) $(PANDOC_METADATA)

# Blog Configuration
COMMENT_SECTION := templates/comment-section.html
PANDOC_BLOG_FILTER := filters/blog_feed.py
PANDOC_DIARY_FILTER := filters/diary.py



# Public Pages configuration
#
# All markdown files
PAGES = \
	build/index.html \
	build/contact.html

# Blog Configuration
BLOG_FEEDS = build/blog/index.html build/blog/rss.xml
BLOG_ENTRIES = $(shell \
  find $(BLOG_DIR) -mindepth 2 -type f -name '*.md' \
  | sed -e 's/\.md/.html/' \
  | sed -e 's/$(call ESCAPE_PATH,$(BLOG_DIR))/$(call ESCAPE_PATH,$(BUILD_DIR))\/blog/g' \
  | $(SORT) \
)
BLOG_BUILD := $(BUILD_DIR)/blog
ENTRIES_TO_RSS := ./scripts/entries2rss.py

# Diary Configuration
DIARY_ENTRIES = $(shell \
  find $(DIARY_DIR) -type f -name '*.md' \
  | sed -e 's/\.md/.html/' \
  | sed -e 's/$(call ESCAPE_PATH,$(DIARY_DIR))/$(call ESCAPE_PATH,$(BUILD_DIR))\/diary/g' \
  | $(SORT) \
)
DIARY_BUILD := $(BUILD_DIR)/diary
DIARY_COMMAND := ./scripts/diary.py $(DIARY_DIR) $(DIARY_BUILD) 
DIARY_INDEX := $(DIARY_BUILD)/index.html $(shell $(DIARY_COMMAND) index-files)

# Build Rules

# PHONY Rules
.PHONY: serve clean info css

info:
	@echo "Blog Entries"
	@echo $(BLOG_ENTRIES) | sed -e 's/^/\t/g;s/\ /\n\t/g'
	@echo "Diary Entries"
	@echo $(DIARY_ENTRIES) | sed -e 's/^/\t/g;s/\ /\n\t/g'


all: $(PAGES) $(BLOG_FEEDS) $(DIARY_INDEX) css

css:
	mkdir -p $(BUILD_DIR)/css
	cp -f $(SRC_DIR)/css/* $(BUILD_DIR)/css/

serve:
	python3 -m http.server --directory $(BUILD_DIR)

clean:
	rm -rf $(BUILD_DIR) $(BLOG_ENTRIES_LIST)

_diary_command:
	@echo "$(DIARY_COMMAND)"

# File Rules

# Blog related rules

$(BLOG_ENTRIES_LIST): $(BLOG_ENTRIES)

$(BUILD_DIR)/blog/%.html: $(BLOG_DIR)/%.md $(COMMENT_SECTION)
	mkdir -p $(shell dirname $@)
	[[ -d "$(shell dirname $<)/assets" ]] \
		&& cp -r $(shell dirname $<)/assets/. $(shell dirname $@)/assets \
		|| echo "Entry with no assets"
	$(PANDOC_COMMAND) \
        --filter $(PANDOC_BLOG_FILTER) \
        --include-after-body=$(COMMENT_SECTION) \
        -i $< -o $@

$(BLOG_BUILD)/index.html: $(BLOG_DIR)/index.md $(BLOG_ENTRIES_LIST)
	cat $(BLOG_ENTRIES_LIST) \
		| $(SORT) \
		| $(ENTRIES_TO_RSS) html \
		| $(PANDOC_COMMAND) -i $< -i - -o $@

$(BLOG_BUILD)/rss.xml: $(BLOG_ENTRIES_LIST)
	cat $(BLOG_ENTRIES_LIST) \
		| $(SORT) \
		| ./scripts/entries2rss.py \
		> $@

# Diary Related rules.

$(DIARY_BUILD)/%.html: $(DIARY_DIR)/%.md
	mkdir -p $(shell dirname $@)
	$(PANDOC_COMMAND) \
        --filter $(PANDOC_DIARY_FILTER) \
		--metadata=diary_dir:$(DIARY_DIR) \
        -i $< -o $@

$(DIARY_BUILD)/%.html: $(DIARY_DIR)/%-*.md
	mkdir -p $(shell dirname $@)
	$(PANDOC_COMMAND) \
		--metadata=diary_dir:$(DIARY_DIR) \
        -i $< -o $@

$(DIARY_BUILD)/index.html: $(DIARY_ENTRIES)
	mkdir -p $(shell dirname $@)
	$(DIARY_COMMAND) index-full \
		| $(PANDOC_COMMAND) -i - -o $@

# Regular page related rules.

$(BUILD_DIR)/%.html: $(SRC_DIR)/%.md
	mkdir -p $(shell dirname $@)
	$(PANDOC_COMMAND) -i $< -o $@