92 lines
2.3 KiB
Rust
92 lines
2.3 KiB
Rust
//! # Helpers
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//!
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//! Various functions calling C wrappers to get/set terminal functionality
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use libc::ioctl;
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use libc::{c_ushort, STDIN_FILENO, STDOUT_FILENO, TIOCGWINSZ};
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use nix::sys::termios;
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use nix::sys::termios::{
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ControlFlags, InputFlags, LocalFlags, OutputFlags, SpecialCharacterIndices, Termios,
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};
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use std::os::unix::io::RawFd;
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use std::sync::Arc;
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#[derive(Debug)]
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pub struct TermSize {
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/// number of rows
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pub rows: u16,
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/// number of columns
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pub cols: u16,
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}
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#[repr(C)]
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#[derive(Debug)]
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struct UnixTermSize {
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/// number of rows
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pub rows: c_ushort,
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/// number of columns
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pub cols: c_ushort,
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x: c_ushort,
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y: c_ushort,
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}
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/// Get a `Termios` struct, for getting/setting terminal flags
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pub fn get_termios(fd: RawFd) -> Termios {
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termios::tcgetattr(fd).unwrap()
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}
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/// Put terminal into raw mode so there is full control of terminal output
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pub fn enable_raw_mode() {
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let mut raw = get_termios(STDIN_FILENO);
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raw.input_flags.remove(
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InputFlags::BRKINT
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| InputFlags::ICRNL
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| InputFlags::INPCK
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| InputFlags::ISTRIP
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| InputFlags::IXON,
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);
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raw.output_flags.remove(OutputFlags::OPOST);
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// 8 bit characters
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raw.control_flags |= ControlFlags::CS8;
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raw.local_flags
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.remove(LocalFlags::ECHO | LocalFlags::ICANON | LocalFlags::IEXTEN | LocalFlags::ISIG);
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raw.control_chars[SpecialCharacterIndices::VMIN as usize] = 0;
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raw.control_chars[SpecialCharacterIndices::VTIME as usize] = 1;
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// Raw mode or bust!
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termios::tcsetattr(STDIN_FILENO, termios::SetArg::TCSAFLUSH, &raw).unwrap();
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}
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/// Restore terminal to "cooked"/canonical mode
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pub fn disable_raw_mode() {
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let mutex = Arc::clone(&super::ORIGINAL_TERMIOS);
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let termios = mutex.lock().unwrap();
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termios::tcsetattr(STDIN_FILENO, termios::SetArg::TCSAFLUSH, &termios).unwrap();
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}
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/// Attempt to get the size of the terminal (in rows and columns) from an `ioctl` call
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pub fn get_term_size() -> Option<TermSize> {
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let raw = UnixTermSize {
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rows: 0,
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cols: 0,
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x: 0,
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y: 0,
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};
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let r = unsafe { ioctl(STDOUT_FILENO, TIOCGWINSZ.into(), &raw) };
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if r == 0 {
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Some(TermSize {
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rows: raw.rows,
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cols: raw.cols,
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})
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} else {
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None
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}
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}
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