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use std::{
    ffi::OsStr,
    path::Path,
    process::{Command, Stdio},
};

pub trait CommandExtra: Sized {
    fn with_current_dir(self, dir: impl AsRef<Path>) -> Self;
    fn with_env(self, key: impl AsRef<OsStr>, value: impl AsRef<OsStr>) -> Self;
    fn without_env(self, key: impl AsRef<OsStr>) -> Self;
    fn with_no_env(self) -> Self;
    fn with_arg(self, arg: impl AsRef<OsStr>) -> Self;
    fn with_stdin(self, stdio: Stdio) -> Self;
    fn with_stdout(self, stdio: Stdio) -> Self;
    fn with_stderr(self, stdio: Stdio) -> Self;

    fn with_args<Args>(self, args: Args) -> Self
    where
        Args: IntoIterator,
        Args::Item: AsRef<OsStr>,
    {
        args.into_iter().fold(self, |cmd, arg| cmd.with_arg(arg))
    }
}

impl CommandExtra for Command {
    fn with_current_dir(mut self, dir: impl AsRef<Path>) -> Self {
        self.current_dir(dir);
        self
    }

    fn with_env(mut self, key: impl AsRef<OsStr>, value: impl AsRef<OsStr>) -> Self {
        self.env(key, value);
        self
    }

    fn without_env(mut self, key: impl AsRef<OsStr>) -> Self {
        self.env_remove(key);
        self
    }

    fn with_no_env(mut self) -> Self {
        self.env_clear();
        self
    }

    fn with_arg(mut self, arg: impl AsRef<OsStr>) -> Self {
        self.arg(arg);
        self
    }

    fn with_stdin(mut self, stdio: Stdio) -> Self {
        self.stdin(stdio);
        self
    }

    fn with_stdout(mut self, stdio: Stdio) -> Self {
        self.stdout(stdio);
        self
    }

    fn with_stderr(mut self, stdio: Stdio) -> Self {
        self.stderr(stdio);
        self
    }
}