1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
use std::io::{self, Write};
use std::ops;
use nix::sys::termios::{tcgetattr, tcsetattr, SetArg, Termios};
use nix::unistd::isatty;
use nix::Error::Sys;
use std::fs;
use std::io::ErrorKind;
use std::os::unix::io::{AsRawFd, RawFd};
pub fn get_tty() -> io::Result<fs::File> {
fs::OpenOptions::new()
.read(true)
.write(true)
.open("/dev/tty")
}
pub struct RawTerminal<W: Write + AsRawFd> {
prev_ios: Termios,
output: W,
}
impl<W: Write + AsRawFd> Drop for RawTerminal<W> {
fn drop(&mut self) {
let _ = tcsetattr(self.output.as_raw_fd(), SetArg::TCSANOW, &self.prev_ios);
}
}
impl<W: Write + AsRawFd> ops::Deref for RawTerminal<W> {
type Target = W;
fn deref(&self) -> &W {
&self.output
}
}
impl<W: Write + AsRawFd> ops::DerefMut for RawTerminal<W> {
fn deref_mut(&mut self) -> &mut W {
&mut self.output
}
}
impl<W: Write + AsRawFd> 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()
}
}
impl<W: Write + AsRawFd> AsRawFd for RawTerminal<W> {
fn as_raw_fd(&self) -> RawFd {
return self.output.as_raw_fd();
}
}
pub trait IntoRawMode: Write + AsRawFd + Sized {
fn into_raw_mode(self) -> io::Result<RawTerminal<Self>>;
}
impl<W: Write + AsRawFd> IntoRawMode for W {
fn into_raw_mode(self) -> io::Result<RawTerminal<W>> {
use nix::errno::Errno::ENOTTY;
use nix::sys::termios::{ControlFlags, InputFlags, LocalFlags, SpecialCharacterIndices};
let istty = isatty(self.as_raw_fd()).map_err(nix_err_to_io_err)?;
if !istty {
Err(nix_err_to_io_err(nix::Error::from_errno(ENOTTY)))?
}
let prev_ios = tcgetattr(self.as_raw_fd()).map_err(nix_err_to_io_err)?;
let mut ios = prev_ios.clone();
ios.input_flags &= !(InputFlags::BRKINT
| InputFlags::ICRNL
| InputFlags::INPCK
| InputFlags::ISTRIP
| InputFlags::IXON);
ios.control_flags |= ControlFlags::CS8;
ios.local_flags &=
!(LocalFlags::ECHO | LocalFlags::ICANON | LocalFlags::IEXTEN | LocalFlags::ISIG);
ios.control_chars[SpecialCharacterIndices::VMIN as usize] = 1;
ios.control_chars[SpecialCharacterIndices::VTIME as usize] = 0;
tcsetattr(self.as_raw_fd(), SetArg::TCSANOW, &ios).map_err(nix_err_to_io_err)?;
Ok(RawTerminal {
prev_ios,
output: self,
})
}
}
fn nix_err_to_io_err(err: nix::Error) -> io::Error {
match err {
Sys(err_no) => io::Error::from(err_no),
_ => io::Error::new(ErrorKind::InvalidData, err),
}
}
#[cfg(test)]
mod test {
use super::*;
use std::io::{stdout, Write};
#[test]
fn test_into_raw_mode() {
let mut out = stdout().into_raw_mode().unwrap();
out.write_all(b"this is a test, muahhahahah\r\n").unwrap();
drop(out);
}
}