Add make-process to create HTML files

The markdown files are converted to Markdown via kramdown, using
a GitHub-like CSS. The resulting HTML files are placed under
./articles-html

.gitignore

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+articles-html

Gemfile

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+gem "rake"
+gem "kramdown"
+gem "coderay" 

Gemfile.lock

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+GEM
+  specs:
+    coderay (1.1.0)
+    kramdown (1.4.2)
+    rake (10.3.2)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  coderay
+  kramdown
+  rake

Rakefile

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+require "kramdown"
+require "coderay"
+require "fileutils"
+
+MARKDOWN_FILES = Dir.glob("#{__dir__}/articles/**/*.md")
+
+task default: :html_files
+
+desc "Generate HTML files from markdown articles"
+task :html_files do
+  MARKDOWN_FILES.each do |markdown_file|
+    html_path = markdown_file.sub("/articles/", "/articles-html/").sub(/\.md$/, ".html")
+    puts "Generating #{html_path}"
+    FileUtils.mkdir_p(File.dirname(html_path))
+    File.open(html_path, "w") do |html_file|
+      filecontent = File.read(markdown_file)
+      filecontent = filecontent.gsub("\`\`\`", "~~~")
+      filecontent = Kramdown::Document.new(filecontent, template: "#{__dir__}/templates/default.html.erb")
+      html_file.write(filecontent.to_html)
+    end
+  end
+end
+
+desc "Delete all generated HTML files"
+task :clean do
+  FileUtils.rm_rf("#{__dir__}/articles-html")
+end