cargo-feature-combinations 0.0.47

run cargo commands for all feature combinations
Documentation 
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use std::io::{Read, Result, Write};

/// A reader that forwards all bytes read to an additional writer.
///
/// This is useful for capturing subprocess output while still streaming it to
/// the terminal.
pub struct Reader<R, W> {
    read: R,
    output: W,
    force_flush: bool,
}

impl<R, W> Reader<R, W> {
    /// Create a new tee reader.
    ///
    /// If `force_flush` is set, the output writer is flushed after every read.
    pub fn new(read: R, output: W, force_flush: bool) -> Self {
        Self {
            read,
            output,
            force_flush,
        }
    }
}

impl<R: Read, W: Write> Read for Reader<R, W> {
    fn read(&mut self, buf: &mut [u8]) -> Result<usize> {
        let n = self.read.read(buf)?;
        let out = buf.get(..n).ok_or_else(|| {
            std::io::Error::new(
                std::io::ErrorKind::InvalidData,
                "reader reported more bytes read than buffer length",
            )
        })?;
        self.output.write_all(out)?;
        if self.force_flush {
            self.output.flush()?;
        }
        Ok(n)
    }
}