dbc-codegen 0.4.0

CAN DBC code-gen for embedded Rust
Documentation 
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use std::io::{Result as IoResult, Write};

// adopted from libcore's `fmt/builders.rs`

/// Indents all lines written to this by four spaces
pub struct PadAdapter<'a> {
    buf: &'a mut (dyn Write + 'a),
    on_newline: bool,
}

impl<'a> PadAdapter<'a> {
    pub(crate) fn wrap<'fmt: 'a>(buf: &'fmt mut (dyn Write + 'a)) -> Self {
        PadAdapter {
            buf,
            on_newline: true,
        }
    }
}

impl Write for PadAdapter<'_> {
    fn write(&mut self, mut s: &[u8]) -> IoResult<usize> {
        let len = s.len();
        while !s.is_empty() {
            if self.on_newline {
                self.buf.write_all(b"    ")?;
            }

            let split = if let Some(pos) = s.iter().position(|&v| v == b'\n') {
                self.on_newline = true;
                pos.checked_add(1).expect("newline position overflowed")
            } else {
                self.on_newline = false;
                s.len()
            };
            self.buf.write_all(&s[..split])?;
            s = &s[split..];
        }

        Ok(len)
    }

    fn flush(&mut self) -> IoResult<()> {
        Ok(())
    }
}