Add ability to take glob patterns from stdin

[jhscheer]

as requested in issue #51

This detects input on stdin using the is_terminal crate.
Each input line is treated as a separate glob pattern.

This adds a new (hidden) flag --stdin to indicate that et should
take input from stdin. Since the naming convention is to use - for
this, we replace the args - with --stdin before we hand them over
to Clap.

Example usage:

$ mkdir Hello; cd Hello
$ touch hello.rs helLo.rs HELlo.rs hello.txt
$  fd -e rs '^hel[lL]o' | et
Hello (2 B)
├─ hello.rs (1 B)
└─ helLo.rs (1 B)

[solidiquis]

Looks like we've got some failed tests. Additionally for this sort of thing I think it would be nice if we can have users pipe the things to et without having to manually allow reading from stdin. So like: fd -e rs '^hel[lL]o' | et

To allow for this sort of thing we'll need to check if stdin is a tty using this crate. If it isn't we proceed to traverse and treeify the output. Let me know what you think.

[jhscheer]

Fixed the test.

I can implement the isatty functionality in a follow-up PR.
However, I would argue in favor of is-terminal because it is an actively maintained port of atty and it is also a dependency of clap, which makes it already a part of our dependency graph.

[solidiquis]

I wasn't aware of that crate. Agreed, is-terminal should be preferred over atty.

[solidiquis]

Let me know if there's anything you disagree with :]

[solidiquis]

Overall this looks fantastic, thank you for implementing this! My last request will be to remove the usage of - as per my other comment. Once that's done I'll get this merged in and include it in this Sunday's minor release :]

[solidiquis]

Hmmm any idea why this is happening? The test seems to be stuck. Happened yesterday as well I can help investigate if you need.

[jhscheer]

I restarted the test, but it looks like it is stuck again.
I think it's an issue with github's CI, I doubt it's related to the changes in this PR.

[solidiquis]

Okay so after doing some digging and playing around I've learned that Github Actions doesn't provide a tty so !stdin().is_terminal() evals to true which causes stdin to hang waiting for input. The solution is quite simple, we just need to modify tests/utils/mod.rs to be this:

    let output = cmd
        .stdin(Stdio::null()) // add this here
        .stdout(Stdio::piped())
        .stderr(Stdio::piped())
        .spawn()
        .unwrap()
        .wait_with_output()
        .unwrap();

Could you make that change and run tests again? Excited to get this merged in!

[solidiquis]

Woot we are good! Thanks for doing this! 💪