Allow edit and display of text files with non .txt extension

[windsource]

Initial Checklist

• I understand this is a feature request and questions should be posted in the Community Discussions
• I searched issues and couldn’t find anything (or linked relevant results below)

Idea

Currently a user is able to display and edit text files in the web UI if the file name contains a .txt extension. It would be nice if other text files like Cargo.toml can be displayed and edited as well.
I am not sure about the proper way to identify text files but at least the Linux file command is able to do that:

> file Cargo.toml
Cargo.toml: ASCII text

[AlexAndBear]

Identifying the mime type via the file content is unfortunately not quite doable, as the load on the server would be quite high as soon as we would open the files list.

Anyways, I linked a pr and added various common file types that are openable with the text editor 👍

[windsource]

I understand that examining a file when creating a file list would create too much load. What about examining a file when it is uploaded? Then the mime type could be stored as part of the metadata and it would be available to all applications. #848 would be an improvement but only for the web UI. I think the iOS app would then need the same, or?

[windsource]

Thinking about that topic a little bit more, I am not sure if the mime is what is required here. The Linux file command cannot determine the detailed mime type but if a file is a text based file or not. Maybe that attribute could be stored as part of meta data (in addition to the mime type)?