dataURIを作る

#!/usr/bin/env ruby

require 'base64'
require 'rubygems'
require 'mime/types'
require 'optparse'

##初期化
with=nil
####引数処理
opt = OptionParser.new
opt.on(
    "--tag=[TAG]",
    "タグに埋め込んだ状態で出力する.デフォルト<img>(MIME判別) ")
    {|arg| 
        case arg
            when nil
                with = "img"
            when false
                with = false
            else
                with = arg
        end
    }

opt.on("--css", "CSS埋め込み用に展開する .url(\"data:image/png;base64,XXXX\") "){ |arg| with = "css"|| arg if arg }
opt.parse!(ARGV)

###メイン処理
data_type =  MIME::Types.type_for(ARGF.path).first.to_s
if with != false then
    with = "script" if data_type =~/script/i
    with = "img"    if data_type =~/image/i
    #with = "embed"  if data_type =~/flash/i # no browser support swf in data uri scheme
    with = "svg"    if data_type =~/svg/i
end

data_str  =  Base64.encode64(ARGF.read).gsub /\n/,""
src_str =  "data:#{data_type};base64,#{data_str}"
##出力処理
case with
    when "img"
        puts "<img src=\"#{src_str}\" />"
    when "script"
        puts "<script src=\"#{src_str}\"></script>"
    when "css"
        puts "url(\"#{src_str}\""
    when "object"
        puts "<object data='#{src_str}' type='#{data_type}'> </object>"
    when "embed"
        puts "<embed src='#{src_str}' type='#{data_type}' />"
    when false
        puts src_str
    else
        puts "<#{with} src=\"#{src_str}\" />"
end