Text files with LaTeX extensions do not open in the text editor.

[SentToDevNull]

Filename extensions include: .tex, .aux, .sty, .bib, .toc, .nav, .cls, .dev, .lof, .bst, .bbx, .lot, .cbx, .bbl, .blg, and .fd

Source for extensions: https://tex.stackexchange.com/questions/7770/file-extensions-related-to-latex-etc

[nickvergessen]

What are the mimetypes of those files?

Can you upload some samples for me here, so I can test it and add them to
https://github.com/nextcloud/files_texteditor/blob/master/js/editor.js#L240-L252

[SentToDevNull]

Here are the mimetypes:

text/x-bibtex
text/x-tex
text/x-log
text/plain
application/x-cdrdao-toc

Here is a link to sample files with those mimetypes:
https://www.lukasyoder.com/nextcloud/index.php/s/QcX3TuDSG2fOJfE

[Spartachetto]

Just a quick remark: the functionality of the issue Manage the file extensions associated with texteditor (#15), would allow the same user (or, maybe better, admin) to perform this operation

[SentToDevNull]

Agreed. Seems like that would be a pretty nice feature to have in Nextcloud 12.

[ruedigerkupper]

@SentToDevNull:
Your MIME type for the .toc file is wrong. The one you mention (application/x-cdrdao-toc) is for CD-table-of-contents. It's used by the popular „cdrdao“ tool for creating CD images.
LaTeX also creates .toc files (for table of contents of written documents). They have, like all LaTeX files, MIME type „text/plain“.

[ruedigerkupper]

@nickvergessen:
All LaTeX files are plain text (originally ASCII, but nowadays usually UTF-8 encoded). That is one feature that made and makes LaTeX so beautiful and long lasting: There is no dedicated editor for LaTeX, just use your favorite text editor, be it Emacs, gedit or vi.
So you would indeed expect that LaTeX files open in your app.