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I'm working on a CLI utility which displays an indicatif::ProgressBar.
I made it possible to pass a custom progress bar by passing a lambda (pb_init) to .with_progress_init, so that in tests I can validate the output.
In a function setting up tests, I define a InMemoryTerm that will be used when drawing the progress bar. I need to define it outside of the pb_init, because I need to return it so I can use it in test assertions.
This is the excerpt of the test code causing trouble (complete code on github):
async fn setup_mocks -> ....... {
// other code
// ....
let in_mem = Rc::new(InMemoryTerm::new(10, 80));
let term = in_mem.clone();
let pb_init = move |size| {
ProgressBar::with_draw_target(
Some(size),
ProgressDrawTarget::term_like(Box::new(*term)))
// ----------------------------------------------------^^^^
// 1. cannot move out of an `Rc`
// move occurs because value has type `indicatif::InMemoryTerm`,
// which does not implement the `Copy` trait [E0507]
};
let downloader = asfald::Downloader::new()
.with_client(github_client)
.with_progress_init(pb_init);
// other code
// ....
// fn returns this struct
GithubMock {
cleanup: Box::new(cleanup),
server_url,
downloader,
url,
expected,
pb_term: in_mem.clone(),
}
}
If I dereference it like in the code above, I get the error in comment. If I don't dereference it, I get the error 1. the trait bound std::rc::Rcindicatif::InMemoryTerm: indicatif::TermLike is not satisfied. Does that mean I need to define a struct wrapping the Rc and implement the trait myself for that struct to delegate all calls to trait functions to the Rc value (which is automatically dereferenced)? Is there a trick to make it easy, just as an Rc is automatically dereferenced thanks to the Deref trait?
FYI I'm a recent rust dev, and might have misunderstood something 
3 posts - 2 participants
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