SHELL = /bin/sh
INSTALLDIR := ./public_html/eh/eh/eh/eh-eh/

# The name of the stylesheet. This needs to be copied to any directory containing html files that use it.
style := style.css
images := images

# Main html template that pandoc uses to generate .html from .md files
template := pandoc/template.html

# Template for extracting metadata of .md files in json format
list_template := pandoc/meta-json-template.txt

# List of articles with their metadata to be used in the creation of the article list in index.html 
article_list := articles.json

# article targets
articles := $(patsubst %.md,%.html,$(wildcard articles/*.md))

all: index.html about.html

install:
	cp -r index.html about.html $(articles) $(style) $(images) $(INSTALLDIR); \

clean:
	echo '{"articles": []}' > $(article_list); \
	rm index.html about.html $(articles);

$(articles): %.html: %.md
	# Build articles using pandoc
	pandoc $< --template $(template) --css $(style) --highlight-style zenburn --mathml --toc --output $@; \
	
	# Extract metadata from .md file
	# pandoc $< --template $(list_template) > article.json.tmp.0; \
	
	# Append filename field to article object. This is used to link to the article from index.html.
	# pandoc $< --template $(list_template) | jq '. += {"filename": "$(notdir $@)"}' > article.json.tmp; \
	
	# Append article object to the article list
	jq '.articles += [$(shell pandoc $< --template $(list_template) | jq '. += {"filename": "$(notdir $@)"}' )]' $(article_list) > articles.json.tmp; \
	mv ./articles.json.tmp $(article_list); \

index.html: index.md $(articles)
	# Build index.html with metadata injected from articles_list
	pandoc $< --template $(template) --css $(style) --metadata-file $(article_list) --highlight-style zenburn --mathml --toc --output $@; \

about.html: about.md
	pandoc $< --template $(template) --css $(style) --highlight-style zenburn --mathml --toc --output $@