oliverdavies.uk/content/node.c8d78160-4a98-441c-a707-c1fde53f9044.yml

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2025-07-10 00:14:12 +01:00
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title:
- value: 'Write programs that do one thing and do it well'
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body:
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<p>Over the last few days, I've written about watchers and running commands such as automated tests when files are changed.</p>
<p>Some tools have this built in, whilst others don't.</p>
<p>I've used different tools to do this and recently switched to <code>entr</code>.</p>
<p>The previous one wasn't showing me the output from running Drupal automated tests, which <code>entr</code> does.</p>
<p>I also like that it follows the UNIX philosophy of doing one thing well and working well with other programs.</p>
<p>For example, to run my automated tests when I change a file, I need to run <code>find web/modules/custom | entr ./run test</code>.</p>
<p><code>entr</code> isn't concerned with how to find the list of files to watch - only what to do with them.</p>
<p>To get the list of files, I use the <code>find</code> command and provide the files to <code>entr</code>.</p>
<p>I also like to do this with my application code. I like to write small modules and libraries with clear boundaries and responsibilities, do their tasks well, and work well with other parts of the application.</p>
format: full_html
processed: |
<p>Over the last few days, I've written about watchers and running commands such as automated tests when files are changed.</p>
<p>Some tools have this built in, whilst others don't.</p>
<p>I've used different tools to do this and recently switched to <code>entr</code>.</p>
<p>The previous one wasn't showing me the output from running Drupal automated tests, which <code>entr</code> does.</p>
<p>I also like that it follows the UNIX philosophy of doing one thing well and working well with other programs.</p>
<p>For example, to run my automated tests when I change a file, I need to run <code>find web/modules/custom | entr ./run test</code>.</p>
<p><code>entr</code> isn't concerned with how to find the list of files to watch - only what to do with them.</p>
<p>To get the list of files, I use the <code>find</code> command and provide the files to <code>entr</code>.</p>
<p>I also like to do this with my application code. I like to write small modules and libraries with clear boundaries and responsibilities, do their tasks well, and work well with other parts of the application.</p>
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