cmd

Macro to help with use the std::process::Command feature of Rust. (only works on nightly)

Usage

```rust

![feature(procmacrohygiene)]

use cmd_macro::cmd;

fn main() { let who = "world"; let output = cmd!(echo hello #who ##who).unwrap(); let output = String::fromutf8(output.stdout).unwrap(); asserteq!(output, "hello world #who\n");

let s = "seq";
let n = 3;
let output = cmd!(#s #{2 * n}).unwrap();
let output = String::from_utf8(output.stdout).unwrap();
assert_eq!(output, "1\n2\n3\n4\n5\n6\n");

} ```

This will expand to ```rust fn main() { let who = "world"; let output = (|| -> std::io::Result { let x0 = std::process::Command::new("echo") .arg("hello") .arg(format!("{}", who)) .arg("#who") .output()?; Ok(x0) })() .unwrap(); let output = String::fromutf8(output.stdout).unwrap(); asserteq!(output, "hello world #who\n");

let s = "seq";
let n = 3;
let output = (|| -> std::io::Result<std::process::Output> {
    let x0 = std::process::Command::new(format!("{}", s))
    .arg(format!("{}", 2 * n))
    .output()?;
    Ok(x0)
})()
.unwrap();
let output = String::from_utf8(output.stdout).unwrap();
assert_eq!(output, "1\n2\n3\n4\n5\n6\n");

} ```

Also supports limited piping

rust let cargo_files = cmd!(ls | grep "Cargo").unwrap(); let cargo_files = String::from_utf8(cargo_files.stdout).unwrap(); assert_eq!(cargo_files, "Cargo.lock\nCargo.toml\n");

which is parsed into

rust let cargo_files = (|| -> std::io::Result<std::process::Output> { let x0 = std::process::Command::new("ls") .stdout(std::process::Stdio::piped()) .spawn()?; let x1 = std::process::Command::new("ls") .stdin(x0.stdout.unwrap()) .output()?; Ok(x1) })() .unwrap(); let cargo_files = String::from_utf8(cargo_files.stdout).unwrap(); assert_eq!(cargo_files, "Cargo.lock\nCargo.toml\n");