Support for the link feature

[joshbode]

I would love to be able to use the link feature and I have created a branch to add support to the configuration parser to expose this: https://github.com/joshbode/ghostty/tree/link-config

I wasn't sure how this was intended to be exposed, so I kept the configuration simple as the regex(es) to be matched, e.g.

# ~/.config/ghostty/config
link = ([~.]?/)?([\w.+-]+/)*([\w.+-]+)
link = \d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}

note: the patterns are checked in the order provided, when matching links

$ ghostty +show-config | grep "^link = "
link = ([~.]?/)?([\w.+-]+/)*([\w.+-]+)
link = \d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}

Do we want to be able to specify the target of the link patterns (i.e. map to something other than open/xdg-open)?
(I have an open wrapper sitting high in my PATH so I can redirect matches where I like, typically to a Neovim session)

Site note: I've been very impressed with Ghostty and it's been working well for me, the only thing that's really been keeping me on Alacritty is this feature, the equivalent there being hints.

[Grazfather]

#2394 is discussing some ways to expose this in the config.

I personally would want something other than open. copy/yank, open in browser, etc, are two big ones.

[joshbode]

I've updated my branch to support specifying a limited set of actions (currently open and copy_to_clipboard):
e.g.:

link = copy_to_clipboard=#ID\d+
link = open=([~.]?/)?([\w.+-]+/)*([\w.+-]+)
link = open=\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}

with:

• open: open with system opener (e.g. open/xdg-open) - if this matches a URL, then it'll (probably) open in the browser
• copy_to_clipboard - what is says on the tin :)

I've tried to keep the same config style as for keybind but I'm open to suggestions