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POAuto-removing all newlines from Haml output
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  1. POAuto-removing all newlines from Haml output
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    copied!<p>I'm using Haml in a Rails 3 app, and its newlines drive me nuts! For example,</p> <pre><code>%span foo </code></pre> <p>renders as</p> <pre><code>&lt;span&gt; foo &lt;/span&gt; </code></pre> <p>But I'd much rather want</p> <pre><code>&lt;span&gt;foo&lt;/foo&gt; </code></pre> <p>The reason (apart from being cleaner XML) is that extra newlines are a problem for my Selenium tests because they mess up the ability to do XPath queries like <code>"//span[.='foo']"</code>. So I'd have to write <code>'\nfoo\n'</code> instead (ew!), or use <code>//span[contains(text(), 'foo')]</code>, which matches too broadly.</p> <p>I know I could use the alligator operators ("&lt;" and ">") to strip whitespace, but since I don't ever have a case where I <em>want</em> the newlines to appear in the output, I'd just end up adding them mechanically at the end of each line. And that just seems very unDRY.</p> <p>So now I see two solutions:</p> <ol> <li>Force Haml to never emit newlines unless they come from a Ruby expression. I see some <code>nuke_inner_whitespace</code> / <code>nuke_outer_whitespace</code> variables spread around the Haml code that might do the job, but I'm not sure how to change them without resorting to gratuitous monkey-patching.</li> <li>Hook into Rails to apply a <code>gsub!("\n", "")</code> to all rendered HTML. (For textarea's and pre's, I could still use <code>~ "foo\nbar"</code> to make Haml emit <code>foo&amp;#x000A;bar</code>.) But where's the right place to hook into Rails? I'm a little lost in the code.</li> </ol> <p>Any pointers or other suggestions appreciated!</p> <p><strong>Update:</strong> I've used Jason's monkey patch below for a while now and I'm beginning to think that it's not worth it. E.g. if I want to get <code>&lt;span&gt;[del]&lt;/span&gt; &lt;span&gt;foo&lt;/span&gt;</code>, it's difficult to <em>not</em> have the blank space in between nuked. Even the following will render as <code>[del]foo</code> on the page:</p> <pre><code>%span = '[del] ' %span foo </code></pre> <p>So I think I'm going back to adding alligator operators manually (see my self-answer down below). Live and learn.</p> <p>Thanks again to Jason! :)</p>
 

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