Static Blog Generator

Rakefile

# frozen_string_literal: true
require 'time'
require 'erb'
require 'org-ruby'
require 'fileutils'

source_files = Rake::FileList.new('posts/*.org')

task default: [*source_files.pathmap('docs/%n.html'), :build_index, :copy_css]

rule '.html' do |t|
  input_file = t.name.pathmap('posts/%n.org')
  post = post_content(input_file)
  render_to_file(t.name, 'assets/post.html.erb', binding)
end

task :build_index do
  posts = source_files
          .map { |i| post_content(i) }
          .sort { |a, b| b[:date] <=> a[:date] }

  render_to_file('docs/index.html', 'assets/index.html.erb', binding)
end

task :copy_css do
  FileUtils.cp('assets/style.css', 'docs/style.css')
end

def org_parser(input_file)
  file = File.read(input_file)
  Orgmode::Parser.new(file, markup_file: 'assets/html.tags.yml')
end

def render_to_file(outfile, template, b)
  template = File.read(template)
  renderer = ERB.new(template)
  output = renderer.result(b)

  File.write(outfile, output)
end

def post_content(input_file)
  parser = org_parser(input_file)

  date = Time.parse(parser.in_buffer_settings['DATE'])
  title = parser.in_buffer_settings['TITLE']
  path = input_file.pathmap('%n.html')

  { title: title, date: date, path: path, formatted_date: date.strftime('%B %d, %Y'), content: parser.to_html }
end