Support reading from standard input

[malte-v]

Kakoune allows reading stdin directly into a buffer, like dmesg | kak from a shell. I use this to page large amounts of text with Kakoune, and IMO Helix should support it, too.

[kirawi]

Piping?

[malte-v]

Yes.

[kirawi]

I think you can do that now #547

[malte-v]

I don't think #547 implements what I mean. I'm talking about reading text from stdin into a buffer on startup.

[malte-v]

For reference, vim allows someprogram | vim -, and neovim as well as Kakoune don't even need the -, e.g. someprogram | nvim/kak.