Is it possible to add extra syntax highlighting support to code notes inside Trilium?

[sv158]

Hi👋 I saw there are some issues asking for support for specific language syntax, and the commit log shows updates in mime_types.ts.
I agree it's good to add more support for mainstream languages. However, for those programming languages still in development, it may not be worth hardcoding them into the languages list.
I noticed that the config page is also a note (despite it can not export as PDF), so I wonder if it's possible to make the syntax highlighting configuration more flexible🤔?
In Tiddlywiki, there are many ways to achieve this. I'm new to Trilium, and I appreciate any replies and help🐣

[dosubot[bot]]

Hi @sv158! I'm Dosu and I’m helping the Trilium team.

Currently, Trilium's syntax highlighting for code notes is built-in and uses highlight.js. Adding support for new languages isn't user-configurable through the UI or config notes—doing so requires editing source files (like mime_types.ts), updating the list of supported languages, and rebuilding Trilium. There's no plugin or config-note mechanism for end users to flexibly add or adjust syntax highlighting like in Tiddlywiki; all changes must be made at the code level and are not dynamically extensible at runtime. Manual language selection is supported, but auto-detection and user-driven extension aren't available at this time [source].

If you want to experiment, you can look into the process described in the PRs for swapping in a custom CKEditor build and updating mime types, but this is a developer-level workflow and not exposed as a user-facing feature [source].

To reply, just mention @dosu.

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