Pastable version of Hash#switchify

<pre class='prettyprint' language='ruby'>class String
  def dasherize
    to_s.gsub '_', '-'
  end
  
  def switchify
    length &gt; 1 ? &quot;--#{dasherize}&quot; : &quot;-#{self}&quot;
  end
end

class Hash
  def switchify
    inject [] do |args, (key, value)|
      next args unless value
      args &lt;&lt; key.to_s.switchify
      args &lt;&lt; (value === String ? value.inspect : value.to_s) unless value === true
      args
    end
  end
end

h = { :config =&gt; 'foo.ini', :verbose =&gt; true, :with_foo_bar =&gt; false, :with_some_coolness =&gt; true, :T =&gt; true }

p h.switchify
# =&gt; [&quot;--config&quot;, &quot;foo.ini&quot;, &quot;--verbose&quot;, &quot;--with-foo&quot;, &quot;-T&quot;]

p h.switchify.join(' ')
# =&gt; --config foo.ini --verbose --with-foo -T</pre>
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Pastable version of Hash#switchify