rust-matchers: add `Matcher` trait and implement `AlwaysMatcher`...
rust-matchers: add `Matcher` trait and implement `AlwaysMatcher`
In our quest of a faster Mercurial, we have arrived at the point where we need
to implement the matchers in Rust.
This RFC mainly for the `Matcher` trait to see if the changes proposed feel
fine to people with more experience on the matter. While the `AlwaysMatcher`
implementation is here as a trivial example, it should be the first step
towards matchers use in Rust as it is currently the only supported one.
Notable changes:
- `exact` is renamed to `exact_match`
- enums for `visit*` methods with `Recursive` instead of `'all'`, etc.
- a new `roots`, separate from `file_set`
- no `bad`, `explicitdir` or `traversedir` functions as they can be passed
to the high functions instead of the matchers
Thanks to Martin for suggesting the last two (most important) changes and for
reaching out to help a few weeks ago.
Differential Revision:
https://phab.mercurial-scm.org/D7178
