147 lines
3.9 KiB
Rust
147 lines
3.9 KiB
Rust
//! Managing raw mode.
|
|
//!
|
|
//! Raw mode is a particular state a TTY can have. It signifies that:
|
|
//!
|
|
//! 1. No line buffering (the input is given byte-by-byte).
|
|
//! 2. The input is not written out, instead it has to be done manually by the programmer.
|
|
//! 3. The output is not canonicalized (for example, `\n` means "go one line down", not "line
|
|
//! break").
|
|
//!
|
|
//! It is essential to design terminal programs.
|
|
//!
|
|
//! # Example
|
|
//!
|
|
//! ```rust,no_run
|
|
//! use termion::raw::IntoRawMode;
|
|
//! use std::io::{Write, stdout};
|
|
//!
|
|
//! fn main() {
|
|
//! let mut stdout = stdout().into_raw_mode().unwrap();
|
|
//!
|
|
//! write!(stdout, "Hey there.").unwrap();
|
|
//! }
|
|
//! ```
|
|
|
|
use std::io::{self, Write};
|
|
use std::ops;
|
|
|
|
/// A terminal restorer, which keeps the previous state of the terminal, and restores it, when
|
|
/// dropped.
|
|
///
|
|
/// Restoring will entirely bring back the old TTY state.
|
|
#[cfg(target_os = "redox")]
|
|
pub struct RawTerminal<W: Write> {
|
|
output: W,
|
|
}
|
|
|
|
#[cfg(target_os = "redox")]
|
|
impl<W: Write> Drop for RawTerminal<W> {
|
|
fn drop(&mut self) {
|
|
write!(self, csi!("?82l")).unwrap();
|
|
}
|
|
}
|
|
|
|
#[cfg(not(target_os = "redox"))]
|
|
use termios::Termios;
|
|
/// A terminal restorer, which keeps the previous state of the terminal, and restores it, when
|
|
/// dropped.
|
|
#[cfg(not(target_os = "redox"))]
|
|
pub struct RawTerminal<W: Write> {
|
|
prev_ios: Termios,
|
|
output: W,
|
|
}
|
|
|
|
#[cfg(not(target_os = "redox"))]
|
|
impl<W: Write> Drop for RawTerminal<W> {
|
|
fn drop(&mut self) {
|
|
use termios::set_terminal_attr;
|
|
set_terminal_attr(&mut self.prev_ios as *mut _);
|
|
}
|
|
}
|
|
|
|
impl<W: Write> ops::Deref for RawTerminal<W> {
|
|
type Target = W;
|
|
|
|
fn deref(&self) -> &W {
|
|
&self.output
|
|
}
|
|
}
|
|
|
|
impl<W: Write> ops::DerefMut for RawTerminal<W> {
|
|
fn deref_mut(&mut self) -> &mut W {
|
|
&mut self.output
|
|
}
|
|
}
|
|
|
|
impl<W: Write> Write for RawTerminal<W> {
|
|
fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
|
|
self.output.write(buf)
|
|
}
|
|
|
|
fn flush(&mut self) -> io::Result<()> {
|
|
self.output.flush()
|
|
}
|
|
}
|
|
|
|
/// Types which can be converted into "raw mode".
|
|
///
|
|
/// # Why is this type defined on writers and not readers?
|
|
///
|
|
/// TTYs has their state controlled by the writer, not the reader. You use the writer to clear the
|
|
/// screen, move the cursor and so on, so naturally you use the writer to change the mode as well.
|
|
pub trait IntoRawMode: Write + Sized {
|
|
/// Switch to raw mode.
|
|
///
|
|
/// Raw mode means that stdin won't be printed (it will instead have to be written manually by
|
|
/// the program). Furthermore, the input isn't canonicalised or buffered (that is, you can
|
|
/// read from stdin one byte of a time). The output is neither modified in any way.
|
|
fn into_raw_mode(self) -> io::Result<RawTerminal<Self>>;
|
|
}
|
|
|
|
impl<W: Write> IntoRawMode for W {
|
|
#[cfg(not(target_os = "redox"))]
|
|
fn into_raw_mode(self) -> io::Result<RawTerminal<W>> {
|
|
use termios::{cfmakeraw, get_terminal_attr, set_terminal_attr};
|
|
|
|
let (mut ios, exit) = get_terminal_attr();
|
|
let prev_ios = ios;
|
|
if exit != 0 {
|
|
return Err(io::Error::new(io::ErrorKind::Other, "Unable to get Termios attribute."));
|
|
}
|
|
|
|
unsafe {
|
|
cfmakeraw(&mut ios);
|
|
}
|
|
|
|
if set_terminal_attr(&mut ios as *mut _) != 0 {
|
|
Err(io::Error::new(io::ErrorKind::Other, "Unable to set Termios attribute."))
|
|
} else {
|
|
let res = RawTerminal {
|
|
prev_ios: prev_ios,
|
|
output: self,
|
|
};
|
|
Ok(res)
|
|
}
|
|
}
|
|
|
|
#[cfg(target_os = "redox")]
|
|
fn into_raw_mode(mut self) -> io::Result<RawTerminal<W>> {
|
|
write!(self, csi!("?82h")).map(|_| {
|
|
RawTerminal { output: self }
|
|
})
|
|
}
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod test {
|
|
use super::*;
|
|
use std::io::{Write, stdout};
|
|
|
|
#[test]
|
|
fn test_into_raw_mode() {
|
|
let mut out = stdout().into_raw_mode().unwrap();
|
|
|
|
out.write_all(b"this is a test, muahhahahah").unwrap();
|
|
}
|
|
}
|