Commands for buffer navigation

[Darksecond]

I would love to see a set of commands for buffer navigation, like in vim.
Specifically something like buffer_next and buffer_previous which can be aliased to :bn and :bp.
They would allow the user to switch buffers without having to go through the b menu.

[sudormrfbin]

There's gn and gp for next and previous buffer, so it's just a matter of adding the typable commands (defined in https://github.com/helix-editor/helix/blob/master/helix-term/src/commands/typed.rs) which utilize already existing functions:

helix/helix-term/src/commands.rs

Lines 636 to 667 in d15c875

	fn goto_next_buffer(cx: &mut Context) {
	goto_buffer(cx, Direction::Forward);
	}
	fn goto_previous_buffer(cx: &mut Context) {
	goto_buffer(cx, Direction::Backward);
	}
	fn goto_buffer(cx: &mut Context, direction: Direction) {
	let current = view!(cx.editor).doc;
	let id = match direction {
	Direction::Forward => {
	let iter = cx.editor.documents.keys();
	let mut iter = iter.skip_while(|id| *id != &current);
	iter.next(); // skip current item
	iter.next().or_else(|| cx.editor.documents.keys().next())
	}
	Direction::Backward => {
	let iter = cx.editor.documents.keys();
	let mut iter = iter.rev().skip_while(|id| *id != &current);
	iter.next(); // skip current item
	iter.next()
	.or_else(|| cx.editor.documents.keys().rev().next())
	}
	}
	.unwrap();
	let id = *id;
	cx.editor.switch(id, Action::Replace);
	}

[David-Kunz]

Hi @Darksecond and @sudormrfbin,

I've just created a PR to add the typed commands buffer-next and buffer-previous.

Best regards,
David