Add support for launching *.drawio files when used in Ubuntu via snap

[thekalinga]

Currently if drawio is installed via snapstore, I am unable to launch application by double clicking on the *.drawio file in file explorer. By default ubuntu is considering drawio as text file. This seems to be due the fact that application/vnd.jgraph.mxfile is an unknown mime type in ubuntu.

Would make user's life much simpler if the application delivered via snap allows user to do this

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Here is how I fixed the issue in my own Ubuntu 16.04 system

1. Created a file at ~/.local/share/mime/packages/drawio.xml with the following content

<?xml version="1.0" encoding="UTF-8"?>
<mime-info xmlns="http://www.freedesktop.org/standards/shared-mime-info">
    <mime-type type="application/vnd.jgraph.mxfile">
        <comment>Drawio Diagram</comment>
        <glob pattern="*.drawio" case-sensitive="true"/>
    </mime-type>
</mime-info>

This seems to be the way we make a new mime type available to ubuntu

2. Update ubuntu mime-database by running update-mime-database ~/.local/share/mime

3. Copy drawio icon to ~/.local/share/icons/application-vnd.jgraph.mxfile.png from /snap/drawio/current/meta/gui/icon.png

i.e I ran cp /snap/drawio/current/meta/gui/icon.png ~/.local/share/icons/application-vnd.jgraph.mxfile.png

(In case of snap, I see the following directory /var/lib/snapd/desktop/icons. Not sure if the icon needs to be copied here as part of snap installation)

4. Update ubuntu icon cache so file manager knows that icon exists update-icon-caches ~/.local/share/icons/

Now all drawio files show icon & also I'm able to right click & associate *.drawio files with Drawio application without affecting the default application for rest of the text files using Files application

Extra notes:

I ran gvfs-info test.drawio/gio test.drawio & looked at standard::icon row in the output.

The row looked like the following

standard::icon: application-vnd.jgraph.mxfile, application-x-generic

The 1st icon name application-vnd.jgraph.mxfile is the name of png file ubuntu looks for. If its not found, it uses application-x-generic.png as the image as fallback. Once I placed under ~/.local/share/icons/application-vnd.jgraph.mxfile.png, all file icons for *.drawio in the file system show drawio icon. The icon preferred for this 128x128 resolution, but even 1024x1024 (default) also seem to work fine

Someone said elsewhere (I have not tried), we can use /usr/share/mime/packages for mime file xml & /usr/share/icons/ for icon update if we want to do it at system level instead of user level

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[cfsanchezMinsait]

Just an update. With Ubuntu 20.04 (I don't know if the version is relevant), I had to copy the file ~/.local/share/mime/packages/drawio.xml also in the path ~/.local/share/mime/application/drawio.xml. I followed all the other steps indicated by @thekalinga, and it worked for me.

[brlin-tw]

Hello, this affects greatly to GNU/Linux users' UX as currently opening the file will launch the default text editor due to its MIME file type has been incorrectly classified as text/plain, please reopen this issue.

[brlin-tw]

Related with #11.