0_intro.md

Attempt to prettify Guardfile

https://github.com/guard/guard + https://github.com/guard/guard-livereload

1_old.rb

  extensions.each do |ext, type|
    watch(%r{
          (?:app|vendor)
          (?:/assets/\w+/(?<path>[^.]+) # path+base without extension
           (?<ext>\.#{ext})) # matching extension (must be first encountered)
          (?:\.\w+|$) # other extensions
          }x) do |m|
      path = m[1]
      "/assets/#{path}.#{type}"
    end
  end

2_new.rb

  extensions.each do |ext, type|
    watch(
      %r{
        (?:app|vendor)

        # Path and base without extension

        (?:/assets/\w+/(?<path>[^.]+)

        # Matching extension, on first encounter

        (?<ext>\.#{ext}))

        # Other extensions

        (?:\.\w+|$)
      }x) do |m|
      path = m[1]
      "/assets/#{path}.#{type}"
    end
  end