local dir = require"pl.dir"
local gumbo = require"gumbo"
local blog = {}
local takeaways = {
	["published-on"] = "published",
	["last-modified-on"] = "modified",
}


function blog.posts (config)
	local pages = dir.getfiles(".", "*.html")
	local posts = {}
	for _, filename in pairs(pages) do
		local document = gumbo.parseFile(filename)
		local metas = document:getElementsByTagName"meta"
		local properties = {title=document.title, filename=filename:sub(3), published=""}
		for _, meta in ipairs(metas) do
			local take = nil
			for _, attribute in ipairs(meta.attributes) do
				if attribute.name == "name" then
					take = takeaways[attribute.value]
				end
				if take and attribute.name == "content" then
					properties[take] = attribute.value
				end
			end
		end
		if config:check(properties.filename) then
			table.insert(posts, properties)
		end
	end
	table.sort(posts, function (lhs, rhs) return lhs.published > rhs.published end)
	return posts
end


return blog