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authorAkshay <[email protected]>2020-06-18 06:09:57 +0100
committerAkshay <[email protected]>2020-06-18 06:09:57 +0100
commit3739ce5d1969df71f272d18a3ff8b5e13cd27f4f (patch)
treea78ba875dbc37b23e5211e9aa6fa7293704110c3 /docs/posts/rapid_refactoring_with_vim
parent43032d7952c9dafce3ba8590db928cfd7edf5519 (diff)
new post: turing complete type systems
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40 <div class="post-text"> 40 <div class="post-text">
41 <p>Last weekend, I was tasked with refactoring the 96 unit tests on <a href="https://github.com/ruma/ruma-events/pull/70">ruma-events</a> to use strictly typed json objects using <code>serde_json::json!</code> instead of raw strings. It was rather painless thanks to vim :)</p> 41 <p>Last weekend, I was tasked with refactoring the 96 unit tests on <a href="https://github.com/ruma/ruma-events/pull/70">ruma-events</a> to use strictly typed json objects using <code>serde_json::json!</code> instead of raw strings. It was rather painless thanks to vim :)</p>
42<p>Here’s a small sample of what had to be done (note the lines prefixed with the arrow):</p> 42<p>Here’s a small sample of what had to be done (note the lines prefixed with the arrow):</p>
43<div class="sourceCode" id="cb1"><pre class="sourceCode rust"><code class="sourceCode rust"><span id="cb1-1"><a href="#cb1-1"></a>→ <span class="kw">use</span> <span class="pp">serde_json::</span><span class="op">{</span>from_str<span class="op">};</span></span> 43<div class="sourceCode" id="cb1"><pre class="sourceCode rust"><code class="sourceCode rust"><span id="cb1-1"><a href="#cb1-1" aria-hidden="true"></a>→ <span class="kw">use</span> <span class="pp">serde_json::</span><span class="op">{</span>from_str<span class="op">};</span></span>
44<span id="cb1-2"><a href="#cb1-2"></a> </span> 44<span id="cb1-2"><a href="#cb1-2" aria-hidden="true"></a> </span>
45<span id="cb1-3"><a href="#cb1-3"></a> <span class="at">#[</span>test<span class="at">]</span></span> 45<span id="cb1-3"><a href="#cb1-3" aria-hidden="true"></a> <span class="at">#[</span>test<span class="at">]</span></span>
46<span id="cb1-4"><a href="#cb1-4"></a> <span class="kw">fn</span> deserialize() <span class="op">{</span></span> 46<span id="cb1-4"><a href="#cb1-4" aria-hidden="true"></a> <span class="kw">fn</span> deserialize() <span class="op">{</span></span>
47<span id="cb1-5"><a href="#cb1-5"></a> <span class="pp">assert_eq!</span>(</span> 47<span id="cb1-5"><a href="#cb1-5" aria-hidden="true"></a> <span class="pp">assert_eq!</span>(</span>
48<span id="cb1-6"><a href="#cb1-6"></a>→ <span class="pp">from_str::</span><span class="op">&lt;</span>Action<span class="op">&gt;</span>(<span class="st">r#&quot;{&quot;set_tweak&quot;: &quot;highlight&quot;}&quot;#</span>)<span class="op">,</span></span> 48<span id="cb1-6"><a href="#cb1-6" aria-hidden="true"></a>→ <span class="pp">from_str::</span><span class="op">&lt;</span>Action<span class="op">&gt;</span>(<span class="st">r#&quot;{&quot;set_tweak&quot;: &quot;highlight&quot;}&quot;#),</span></span>
49<span id="cb1-7"><a href="#cb1-7"></a> <span class="pp">Action::</span>SetTweak(<span class="pp">Tweak::</span>Highlight <span class="op">{</span> value<span class="op">:</span> <span class="cn">true</span> <span class="op">}</span>)</span> 49<span id="cb1-7"><a href="#cb1-7" aria-hidden="true"></a><span class="st"> Action::SetTweak(Tweak::Highlight { value: true })</span></span>
50<span id="cb1-8"><a href="#cb1-8"></a> )<span class="op">;</span></span> 50<span id="cb1-8"><a href="#cb1-8" aria-hidden="true"></a><span class="st"> );</span></span>
51<span id="cb1-9"><a href="#cb1-9"></a> <span class="op">}</span></span></code></pre></div> 51<span id="cb1-9"><a href="#cb1-9" aria-hidden="true"></a><span class="st"> }</span></span></code></pre></div>
52<p>had to be converted to:</p> 52<p>had to be converted to:</p>
53<div class="sourceCode" id="cb2"><pre class="sourceCode rust"><code class="sourceCode rust"><span id="cb2-1"><a href="#cb2-1"></a>→ <span class="kw">use</span> <span class="pp">serde_json::</span><span class="op">{</span>from_value<span class="op">};</span></span> 53<div class="sourceCode" id="cb2"><pre class="sourceCode rust"><code class="sourceCode rust"><span id="cb2-1"><a href="#cb2-1" aria-hidden="true"></a>→ <span class="kw">use</span> <span class="pp">serde_json::</span><span class="op">{</span>from_value<span class="op">};</span></span>
54<span id="cb2-2"><a href="#cb2-2"></a> </span> 54<span id="cb2-2"><a href="#cb2-2" aria-hidden="true"></a> </span>
55<span id="cb2-3"><a href="#cb2-3"></a> <span class="at">#[</span>test<span class="at">]</span></span> 55<span id="cb2-3"><a href="#cb2-3" aria-hidden="true"></a> <span class="at">#[</span>test<span class="at">]</span></span>
56<span id="cb2-4"><a href="#cb2-4"></a> <span class="kw">fn</span> deserialize() <span class="op">{</span></span> 56<span id="cb2-4"><a href="#cb2-4" aria-hidden="true"></a> <span class="kw">fn</span> deserialize() <span class="op">{</span></span>
57<span id="cb2-5"><a href="#cb2-5"></a> <span class="pp">assert_eq!</span>(</span> 57<span id="cb2-5"><a href="#cb2-5" aria-hidden="true"></a> <span class="pp">assert_eq!</span>(</span>
58<span id="cb2-6"><a href="#cb2-6"></a>→ <span class="pp">from_value::</span><span class="op">&lt;</span>Action<span class="op">&gt;</span>(<span class="pp">json!</span>(<span class="op">{</span><span class="st">&quot;set_tweak&quot;</span><span class="op">:</span> <span class="st">&quot;highlight&quot;</span><span class="op">}</span>))<span class="op">,</span></span> 58<span id="cb2-6"><a href="#cb2-6" aria-hidden="true"></a>→ <span class="pp">from_value::</span><span class="op">&lt;</span>Action<span class="op">&gt;</span>(<span class="pp">json!</span>(<span class="op">{</span><span class="st">&quot;set_tweak&quot;</span><span class="op">:</span> <span class="st">&quot;highlight&quot;</span><span class="op">}</span>))<span class="op">,</span></span>
59<span id="cb2-7"><a href="#cb2-7"></a> <span class="pp">Action::</span>SetTweak(<span class="pp">Tweak::</span>Highlight <span class="op">{</span> value<span class="op">:</span> <span class="cn">true</span> <span class="op">}</span>)</span> 59<span id="cb2-7"><a href="#cb2-7" aria-hidden="true"></a> <span class="pp">Action::</span>SetTweak(<span class="pp">Tweak::</span>Highlight <span class="op">{</span> value<span class="op">:</span> <span class="cn">true</span> <span class="op">}</span>)</span>
60<span id="cb2-8"><a href="#cb2-8"></a> )<span class="op">;</span></span> 60<span id="cb2-8"><a href="#cb2-8" aria-hidden="true"></a> )<span class="op">;</span></span>
61<span id="cb2-9"><a href="#cb2-9"></a> <span class="op">}</span></span></code></pre></div> 61<span id="cb2-9"><a href="#cb2-9" aria-hidden="true"></a> <span class="op">}</span></span></code></pre></div>
62<h3 id="the-arglist">The arglist</h3> 62<h3 id="the-arglist">The arglist</h3>
63<p>For the initial pass, I decided to handle imports, this was a simple find and replace operation, done to all the files containing tests. Luckily, modules (and therefore files) containing tests in Rust are annotated with the <code>#[cfg(test)]</code> attribute. I opened all such files:</p> 63<p>For the initial pass, I decided to handle imports, this was a simple find and replace operation, done to all the files containing tests. Luckily, modules (and therefore files) containing tests in Rust are annotated with the <code>#[cfg(test)]</code> attribute. I opened all such files:</p>
64<div class="sourceCode" id="cb3"><pre class="sourceCode bash"><code class="sourceCode bash"><span id="cb3-1"><a href="#cb3-1"></a><span class="co"># `grep -l pattern files` lists all the files</span></span> 64<div class="sourceCode" id="cb3"><pre class="sourceCode bash"><code class="sourceCode bash"><span id="cb3-1"><a href="#cb3-1" aria-hidden="true"></a><span class="co"># `grep -l pattern files` lists all the files</span></span>
65<span id="cb3-2"><a href="#cb3-2"></a><span class="co"># matching the pattern</span></span> 65<span id="cb3-2"><a href="#cb3-2" aria-hidden="true"></a><span class="co"># matching the pattern</span></span>
66<span id="cb3-3"><a href="#cb3-3"></a></span> 66<span id="cb3-3"><a href="#cb3-3" aria-hidden="true"></a></span>
67<span id="cb3-4"><a href="#cb3-4"></a><span class="ex">vim</span> <span class="va">$(</span><span class="fu">grep</span> -l <span class="st">&#39;cfg\(test\)&#39;</span> ./**/*.rs<span class="va">)</span></span> 67<span id="cb3-4"><a href="#cb3-4" aria-hidden="true"></a><span class="ex">vim</span> <span class="va">$(</span><span class="fu">grep</span> -l <span class="st">&#39;cfg\(test\)&#39;</span> ./**/*.rs<span class="va">)</span></span>
68<span id="cb3-5"><a href="#cb3-5"></a></span> 68<span id="cb3-5"><a href="#cb3-5" aria-hidden="true"></a></span>
69<span id="cb3-6"><a href="#cb3-6"></a><span class="co"># expands to something like:</span></span> 69<span id="cb3-6"><a href="#cb3-6" aria-hidden="true"></a><span class="co"># expands to something like:</span></span>
70<span id="cb3-7"><a href="#cb3-7"></a><span class="ex">vim</span> push_rules.rs room/member.rs key/verification/lib.rs</span></code></pre></div> 70<span id="cb3-7"><a href="#cb3-7" aria-hidden="true"></a><span class="ex">vim</span> push_rules.rs room/member.rs key/verification/lib.rs</span></code></pre></div>
71<p>Starting vim with more than one file at the shell prompt populates the arglist. Hit <code>:args</code> to see the list of files currently ready to edit. The square [brackets] indicate the current file. Navigate through the arglist with <code>:next</code> and <code>:prev</code>. I use tpope’s vim-unimpaired <a href="#fn1" class="footnote-ref" id="fnref1" role="doc-noteref"><sup>1</sup></a>, which adds <code>]a</code> and <code>[a</code>, mapped to <code>:next</code> and <code>:prev</code>.</p> 71<p>Starting vim with more than one file at the shell prompt populates the arglist. Hit <code>:args</code> to see the list of files currently ready to edit. The square [brackets] indicate the current file. Navigate through the arglist with <code>:next</code> and <code>:prev</code>. I use tpope’s vim-unimpaired <a href="#fn1" class="footnote-ref" id="fnref1" role="doc-noteref"><sup>1</sup></a>, which adds <code>]a</code> and <code>[a</code>, mapped to <code>:next</code> and <code>:prev</code>.</p>
72<p>All that’s left to do is the find and replace, for which we will be using vim’s <code>argdo</code>, applying a substitution to every file in the arglist:</p> 72<p>All that’s left to do is the find and replace, for which we will be using vim’s <code>argdo</code>, applying a substitution to every file in the arglist:</p>
73<pre><code>:argdo s/from_str/from_value/g</code></pre> 73<pre><code>:argdo s/from_str/from_value/g</code></pre>