Glyphicons rake task and helpers

examples.rb

link_to_glyphicon(:edit, edit_admin_product_coupon_path(@product, coupon))

glyphicon(:move, :class => 'drag_handle', :title => "Drag to reorder", :variant => :halfling)

glyphicons.rake

namespace :misc do
  task :glyphs => :environment do
    glyphs = []
    longest_name = 0
    Dir.glob(File.join(Rails.root, "public/images/glyphicons/*.png")) do |path|
      width, height = `identify -format "%wx%h" #{path}`.strip.split(/x/)

      # glyphicons_083_random.png
      # glyphicons_083_random@2x.png
      # glyphicons_halflings_047_bold.png
      
      path.match(/\/(glyphicons_(halflings_)?(\d+)_([^.@]+)(@2x)?)\.png$/)
      filename, halfling, num, name, x2 = $1, $2, $3, $4, $5
      name = name + "_" + (halfling.present? ? 'halfling' : x2.present? ? 'x2' : 'normal')
      glyphs << { :name => name, :num => num, :width => width, :height => height, :filename => filename }
      len = name.length
      longest_name = len if len > longest_name
    end
    File.open(File.join(Rails.root, "glyphs.rb"), "w") do |f| 
      f.write("  GLYPHICONS = {\n")
      f.write(glyphs.map {|glyph| "    '#{glyph[:name]}' #{" " * (longest_name - glyph[:name].length)} => [#{'%2d' % glyph[:width]}, #{'%2d' % glyph[:height]}, '#{glyph[:filename]}']" }.join(",\n"))
      f.write("\n  }\n")
    end
  end
end

glyphicons_helper.rb

module GlyphiconsHelper
  # options:
  #   :variant = :normal, :halfling, :x2
  def glyphicon(name, options = {})    
    variant = (options.delete(:variant).presence || 'normal').to_s
    width, height, filename = GLYPHICONS["#{name}_#{variant}"]
    
    divisor = variant == 'normal' ? 1.5 : 1
    
    image_tag(
      "glyphicons/#{filename}.png", 
      options.merge(:size => "#{(width.to_f/divisor).round}x#{(height.to_f/divisor).round}", :class => ['glyphicon', options.delete(:class)].compact.join(" "))
    )
  end
  
  def link_to_glyphicon(name, *args) 
    options = args.last.is_a?(Hash) ? args.last.dup : {}
    if options[:class].present?
      options[:class] += " glyphicon"
    else
      options[:class] = "glyphicon"
    end
    variant = options.delete(:variant) || :normal
    args[args.length - 1] = options if args.last.is_a?(Hash)
    link_to(glyphicon(name, :variant => variant), *args)
  end
end