rvm-rs 0.0.4

Resolc compiler version manager
Documentation 
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//! resolc wrapper

use anyhow::Context;
use rvm::VersionManager;
use std::io;
use std::process::{Command, ExitStatus, Stdio};

fn main() {
    let code = match runner() {
        Ok(code) => code,
        Err(err) => {
            eprintln!("rvm: error: {err}");
            1
        }
    };
    std::process::exit(code);
}

fn runner() -> anyhow::Result<i32> {
    let mut args = std::env::args_os().skip(1).peekable();
    let manager = VersionManager::new(true)?;
    let bin = {
        if let Some(version) = args
            .peek()
            .and_then(|str| str.to_str())
            .and_then(|arg| arg.strip_prefix('+'))
            .map(|arg| {
                arg.parse::<semver::Version>()
                    .context("failed to parse version specifier")
            })
            .transpose()
            .context("failed to parse version specifier")?
        {
            args.next();
            manager.get(&version, None)?
        } else {
            manager.get_default()?
        }
    };

    let bin_path = bin.local().expect("should not fail");

    if !bin_path.exists() {
        anyhow::bail!(
            "Resolc version {} is not installed or does not exist; looked at {}",
            bin.version(),
            bin_path.display()
        );
    }

    let mut cmd = Command::new(bin_path);
    cmd.args(args)
        .stdin(Stdio::inherit())
        .stdout(Stdio::inherit())
        .stderr(Stdio::inherit());
    Ok(exec(&mut cmd)?.code().unwrap_or(-1))
}

fn exec(cmd: &mut Command) -> io::Result<ExitStatus> {
    #[cfg(unix)]
    {
        use std::os::unix::prelude::*;
        Err(cmd.exec())
    }
    #[cfg(not(unix))]
    {
        cmd.status()
    }
}