Syntax hightlighting for interactive rebase

[Ivaylo Draganov]

This is a nice feature that I miss from the Kate editor on KDE. When doing interactive rebase the action, hash and commit message are highlighted in different colors. It's a simple quality of life improvement. Here's a quick mock-up (with example colors):

Prior art in Kate text editor:

[Sonny]

That's a nice idea.

Does kate uses different colors for pick, drop, reword, ... ? If so can you post a screenshot.

[Ivaylo Draganov]

Does kate uses different colors for pick, drop, reword, ... ? If so can you post a screenshot.

I hadn't noticed but indeed it uses different colors for some of the commands:

[Sonny]

Commit now use GtkSourceView which has a powerful language spec system.

It doesn't have one for git but that should be reasonabily easy to do.

https://gitlab.gnome.org/GNOME/gtksourceview/-/tree/master/data/language-specs
https://wiki.gnome.org/Projects/GtkSourceView/LanguageDefinitions
https://builder.readthedocs.io/en/latest/plugins/editor/highlighting.html
https://gnome.pages.gitlab.gnome.org/gtksourceview/gtksourceview5/lang-tutorial.html
https://gnome.pages.gitlab.gnome.org/gtksourceview/gtksourceview5/lang-reference.html

[Sonny]

Commit now has language definitions for git and hg

https://github.com/sonnyp/Commit/tree/main/src/language-specs

Should be quite straightforward to add support for git rebase syntax highlighting