Rust-Pipe.md

Rust Pipe

A rust implementation of the pipe operator.

Example

# Using cargo run
cargo run -- --in curl https://systemglitch.me --out grep SystemGlitch

./my-pipe --in curl https://systemglitch.me --out grep SystemGlitch

To pass arguments to sub-commands, you may need to escape hyphens:

./my-pipe --in find ./target \\-name '*cargo*' \\-exec sleep 1 \; \\-exec echo {} \;  --out grep "cargo"

rust-pipe.rs

use clap::{Arg, App}; // Dependency: clap = "2.33.0"
use std::io;
use std::process::{self, Command, Stdio};

fn main() -> io::Result<()> {
    let matches = App::new("rust-pipe")
        .version("0.1.0")
        .author("Jérémy LAMBERT (SystemGlitch) <[email protected]>")
        .about("Rust pipe implementation")
        .arg(
            Arg::with_name("in")
                .short("i")
                .long("in")
                .value_name("input_command")
                .help("Input command")
                .takes_value(true)
                .multiple(true),
        )
        .arg(
            Arg::with_name("out")
                .short("o")
                .long("out")
                .value_name("output_command")
                .help("Output command")
                .takes_value(true)
                .multiple(true),
        )
        .get_matches();

    let mut in_cmd: Vec<String> = matches.values_of("in")
        .unwrap().map(|x| {
            x.replace("\\-", "-")
        }).collect();
    let mut out_cmd: Vec<String> = matches.values_of("out")
        .unwrap().map(|x| {
            x.replace("\\-", "-")
        }).collect();

    let input = Command::new(in_cmd.remove(0))
        .args(in_cmd)
        .stdout(Stdio::piped())
        .stderr(Stdio::inherit())
        .spawn().unwrap();

    let output = Command::new(out_cmd.remove(0))
        .args(out_cmd)
        .stdin(input.stdout.unwrap())
        .stderr(Stdio::inherit())
        .stdout(Stdio::inherit())
        .output()
        .unwrap();
    
    if output.status.success() {
        print!("{}", String::from_utf8(output.stdout).unwrap());
        Ok(())
    } else {
        print!("{}", String::from_utf8(output.stderr).unwrap());
        process::exit(output.status.code().unwrap())
    }
}