2019-08-23 16:46:04 -04:00
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use libc::ioctl;
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2019-08-26 16:39:52 -04:00
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use libc::{c_ushort, STDIN_FILENO, STDOUT_FILENO, TIOCGWINSZ};
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2019-08-22 16:44:47 -04:00
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use nix::sys::termios;
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use nix::sys::termios::{
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2019-08-23 13:33:18 -04:00
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ControlFlags, InputFlags, LocalFlags, OutputFlags, SpecialCharacterIndices, Termios,
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2019-08-22 16:44:47 -04:00
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};
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use std::os::unix::io::RawFd;
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2019-08-22 14:25:18 -04:00
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2019-08-23 16:46:04 -04:00
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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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2019-08-23 14:57:26 -04:00
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/// Convert Ctrl+letter chords to their
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/// ASCII table equivalents
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#[inline]
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pub fn ctrl_key(c: char) -> char {
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let key = c as u8;
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if !c.is_ascii() {
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panic!("CTRL_KEY only accepts ASCII characters");
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}
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// Intentionally "overflow" u8 to wrap around to the
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// beginning of the ASCII table. Ctrl+a is 1, Ctrl+b is 2, etc.
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(key & 0x1f) as char
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}
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/// Get a `Termios` struct, for getting/setting terminal flags
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2019-08-22 16:44:47 -04:00
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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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2019-08-23 14:57:26 -04:00
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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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2019-08-22 16:44:47 -04:00
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let mut raw = get_termios(STDIN_FILENO);
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raw.input_flags.remove(
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2019-08-23 13:33:18 -04:00
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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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2019-08-27 17:38:05 -04:00
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// 8 bit characters
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raw.control_flags |= ControlFlags::CS8;
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2019-08-22 16:44:47 -04:00
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2019-08-27 17:38:05 -04:00
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raw.local_flags
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.remove(LocalFlags::ECHO | LocalFlags::ICANON | LocalFlags::IEXTEN | LocalFlags::ISIG);
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2019-08-22 16:44:47 -04:00
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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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2019-08-23 14:57:26 -04:00
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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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2019-08-22 16:44:47 -04:00
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}
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2019-08-23 14:57:26 -04:00
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/// Restore terminal to "cooked"/canonical mode
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pub fn disable_raw_mode(original: &Termios) {
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termios::tcsetattr(STDIN_FILENO, termios::SetArg::TCSAFLUSH, original).unwrap();
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2019-08-23 13:33:18 -04:00
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}
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2019-08-23 16:46:04 -04:00
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2019-08-27 17:38:05 -04:00
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/// Attempt to get the size of the terminal (in rows and columns) from an `ioctl` call
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2019-08-23 16:46:04 -04:00
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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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