scarb 0.1.0

The Cairo package manager
Documentation 
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use std::env;
use std::ffi::OsStr;
use std::path::PathBuf;
use std::process::Command;

use anyhow::{bail, Result};

use crate::core::Config;
use crate::process::{exec_replace, is_executable};
use crate::subcommands::{get_env_vars, EXTERNAL_CMD_PREFIX};

#[tracing::instrument(level = "debug", skip(config))]
pub fn execute_external_subcommand(cmd: &str, args: &[&OsStr], config: &Config) -> Result<()> {
    let Some(cmd) = find_external_subcommand(cmd, config) else {
        // TODO(mkaput): Reuse clap's no such command message logic here.
        bail!("no such command: `{cmd}`");
    };

    // TODO(mkaput): Jobserver.
    // TODO(#129): Write a test that CTRL+C kills everything, like Cargo's death,
    //   but perhaps use an external bash script? Use Job Objects or smth else to fix it.

    let mut cmd = Command::new(cmd);
    cmd.args(args);
    cmd.envs(get_env_vars(config)?);

    exec_replace(&mut cmd)
}

fn find_external_subcommand(cmd: &str, config: &Config) -> Option<PathBuf> {
    let command_exe = format!("{EXTERNAL_CMD_PREFIX}{cmd}{}", env::consts::EXE_SUFFIX);
    config
        .dirs()
        .path_dirs
        .iter()
        .map(|dir| dir.join(&command_exe))
        .find(|file| is_executable(file))
}