Diffy : RubyでStringクラスのdiffを扱うGem

diffyはRubyのStringクラスのdiffを扱うGemです。

出力パターンも相当に頑張ってます。

文字

>> puts Diffy::Diff.new("alpha\nbeta","alpha\ngumma").to_s

 alpha
-beta
\ No newline at end of file
+gumma
\ No newline at end of file

シンプルなhtml出力

>> puts Diffy::Diff.new("alpha\nbeta","alpha\ngumma").to_s(:html_simple)

<div class="diff">
  <ul>
    <li class="unchanged"><span>alpha</span></li>
    <li class="del"><del>beta</del></li>

    <li class="ins"><ins>gumma</ins></li>

  </ul>
</div>

gitっぽく+と-を入れる

>> puts Diffy::Diff.new("alpha\nbeta","alpha\ngumma", :include_plus_and_minus_in_html => true).to_s(:html_simple)

<div class="diff">
  <ul>
    <li class="unchanged"><span><span class="symbol"> </span>alpha</span></li>
    <li class="del"><del><span class="symbol">-</span>beta</del></li>

    <li class="ins"><ins><span class="symbol">+</span>gumma</ins></li>

  </ul>
</div>

html出力

>> puts Diffy::Diff.new("alpha\nbeta","alpha\ngumma").to_s(:html)

<div class="diff">
  <ul>
    <li class="unchanged"><span>alpha</span></li>
    <li class="del"><del><strong>bet</strong>a</del></li>
    <li class="ins"><ins><strong>gumm</strong>a</ins></li>
  </ul>
</div>

上手く捩じ込めば既存のwebフレームワーク(railsとかsinatraとか）にも使う事ができます。

参考もと

• https://github.com/samg/diffy