Yuya Nishihara <yuya@tcha.org> [Fri, 10 Apr 2020 22:44:51 +0900] rev 44851
rust-chg: reimplement run_command operation as async function
The crafted state machine is no longer needed thanks to async/await.
The state machine is basically rewritten as follows:
- Ready(..) -> return ..
- PollAgain(..) -> run .. and await
- Err(..) -> return Err(..)
Differential Revision: https://phab.mercurial-scm.org/D8445
Yuya Nishihara <yuya@tcha.org> [Fri, 10 Apr 2020 22:23:10 +0900] rev 44850
rust-chg: reimplement uihandler by using async-trait and tokio-0.2
We no longer have to consume self and arguments.
Differential Revision: https://phab.mercurial-scm.org/D8444
Yuya Nishihara <yuya@tcha.org> [Fri, 10 Apr 2020 23:08:57 +0900] rev 44849
rust-chg: have attach_io() simply take reference of AsRawFd object
We no longer have to deal with the restriction of the Future type.
Before, these file objects couldn't be references and that's the only
reason why we had to make stderr an Option<T>.
This fixes future type deduction issue of stderr = None, where rustc would
complain that T of Option<T> couldn't be deduced.
Differential Revision: https://phab.mercurial-scm.org/D8443