Add "highlight current line"

[MarkuBu]

A standard feature of most editors is highlighting the current line.

This is something I miss in Helix.

[trcm]

I'd like to work on this

[thienpow]

yes having a current line highlighted is absolutely nice, adding to that the cursor should show | instead of a big block when inserting text. big block cursor should only be shown when not in insert mode

look at this video to "feel" how nice is it with | cursor and full current line highligted
https://www.youtube.com/watch?v=FW2X1CXrU1w

[workingj]

There is a setting for cursor per mode:

[editor.cursor-shape]
insert = "bar"
normal = "block"
select = "underline"

[TobTobXX]

Just gonna drop the term cursorline in here, for anyone searching this in the future. That's what vim calls it.

A consideration that needs to be made (in contrast to many other editors) is that helix can have multiple cursors. Probably all lines should be highlighted then.

[archseer]

Should be an easy thing to add, there's already code that does this to highlight the current position of the debugger:

helix/helix-term/src/ui/editor.rs

Lines 103 to 111 in cc68fa8

	surface.set_style(
	Rect::new(
	area.x,
	area.y + (line - view.offset.row) as u16,
	area.width,
	1,
	),
	theme.get("ui.highlight"),
	);

[TobTobXX]

Ok, I took my shot at this by patching together the logic from the DAP highlight and gutter highlighting (see TobTobXX@f9f33e0). It works, but only the default theme makes it show up. (Probably bc ui.highlight is a relatively new theme key?)

Still need to implement config...