use std::io::Write;

use derive_more::{Deref, DerefMut};

/// A wrapper around a child process's stdin that implements the Write trait.
///
/// This struct allows writing data to an external process's standard input
/// in a way that's compatible with Rust's I/O traits.
#[derive(Deref, DerefMut)]
pub struct ProgramWriter {
    /// The stdin handle of a spawned child process
    #[deref]
    #[deref_mut]
    pub stdin: std::process::ChildStdin,
}

impl Write for ProgramWriter {
    fn write(&mut self, buf: &[u8]) -> std::io::Result<usize> {
        self.stdin.write(buf)
    }

    fn flush(&mut self) -> std::io::Result<()> {
        self.stdin.flush()
    }
}