Add custom file type ".drawio" in addition to ".xml"

[arnowelzel]

This is one possible way to deal with #32.

My change adds the additional neccessary handling:

• additional MIME type application/x-drawio (extension .drawio) in the app configuration
• extending actions for opening files - .drawio will be handled as well and not only .xml
• if XML is not associated with Draw.io, the "new" action will create files with the extension .drawio and not .xml
• additional note in the admin settings about the need to register the MIME type manually

To do

Translations for the admin settings note. And maybe we also find a more elegant way to deal with custom file types and the associated icons without "hacking" the file list on the fly.

How to deal with the custom MIME type

Unfortunately an app can not extend the MIME type mapping in Nextcloud by itself (at least I don't know any official way) - however one can register this type manually (as described for Ownpad which also uses a custom file type):

Just copy /resources/config/mimetypemapping.dist.json to /config/mimetypemapping.json (in the config/ folder at Nextcloud’s root directory; the file should be stored next to the config.php file). Afterwards add the two following line just after the “_comment” lines.

"drawio": ["application/x-drawio"],

If all other mimetypes are not working properly, just run the following command:

sudo -u www-data php occ files:scan --all

[arnowelzel]

It's now nearly two months since my last update. Any problem with this pull request? Is this app still under active development?

[pawelrojek]

@arnowelzel
Sorry for the delay. I had to miss the notification earlier.

Thanks for the code. Great job.

[arnowelzel]

Thanks!