[piekvorst]

So, the approach is identical to <a href="example.com">example</a>.

In contrast, in Plumber [1], we have things like !98—this text opens pull request no. 98 by passing "!98" to the local server, which knows how to interpret it.

Both approaches go one step beyond plain text. However, Plumber’s approach, at least, doesn’t compromise the plain text itself by embedding invisible elements.

This eliminates an entire category of risks by design. With no hidden metadata, accidental clicks are less probable and social engineering attacks, such as UI deception, are impossible.

[1]: https://p9f.org/sys/doc/plumb.html

[quesera]

What is the reference to Plan9 here?

!x has been a shell history expansion since at least csh (1978?).