termion/src/extra.rs

30 lines
959 B
Rust
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use std::io::{Read, Write};
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use {IntoRawMode, TerminalError};
/// Extension to `Read` trait.
pub trait ReadExt {
/// Read a password.
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///
/// EOT and ETX will abort the prompt, returning `None`. Newline or carriage return will
/// complete the password input.
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fn read_passwd<W: Write>(&mut self, writer: &mut W) -> Result<Option<String>, TerminalError>;
}
impl<R: Read> ReadExt for R {
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fn read_passwd<W: Write>(&mut self, writer: &mut W) -> Result<Option<String>, TerminalError> {
let _raw = try!(writer.into_raw_mode());
let mut string = String::with_capacity(30);
for c in self.bytes() {
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match c {
Err(_) => return Err(TerminalError::StdinError),
Ok(0) | Ok(3) | Ok(4) => return Ok(None),
Ok(b'\n') | Ok(b'\r') => return Ok(Some(string)),
Ok(c) => string.push(c as char),
}
}
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Ok(Some(string))
}
}