[Linux] .jl files are identified as "plain text documents"

General Usage
4

I was finally able to fix this by following this guide. The conclusion was essentially (all steps must be done with admin priviliges):

  1. Create /usr/share/mime/packages/julia.xml (easiest way is to copy and rename one of the files in there).
  2. Change the file contents to
<?xml version="1.0" encoding="utf-8"?>
<mime-info xmlns='http://www.freedesktop.org/standards/shared-mime-info'>
  <mime-type type="text/julia">
      <comment>Julia source code</comment>
      <glob pattern="*.jl"/>
    </mime-type>
</mime-info>
  1. Run sudo update-mime-database /usr/share/mime

Sidenote: rust files also had the line
<sub-class-of type="text/plain"/>, which seems very correct. However, I could not make the association work when I included that line.

Sidenote 2: I was unable to get an icon for the extension to work, but that would have been nice.

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