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
|
use std::io::{self, stdout, Write};
use crossterm::{
cursor,
cursor::position,
event::{self, read, Event, KeyCode, KeyEvent},
execute, style,
terminal::{self, disable_raw_mode, enable_raw_mode},
Result,
};
const HELP: &str = r#"
- Use q to quit
- Move cursor with h, j, k, l
"#;
pub struct Editor {}
impl Editor {
pub fn read_char() -> Result<char> {
loop {
if let Ok(Event::Key(KeyEvent {
code: KeyCode::Char(c),
..
})) = event::read()
{
return Ok(c);
}
}
}
pub fn print_events() -> Result<()> {
loop {
// Handle key events
match Editor::read_char()? {
'h' => execute!(io::stdout(), cursor::MoveLeft(1))?,
'j' => execute!(io::stdout(), cursor::MoveDown(1))?,
'k' => execute!(io::stdout(), cursor::MoveUp(1))?,
'l' => execute!(io::stdout(), cursor::MoveRight(1))?,
'q' => {
execute!(
io::stdout(),
style::ResetColor,
cursor::Show,
terminal::LeaveAlternateScreen
)?;
break;
}
_ => println!("use 'q' to quit."),
}
}
Ok(())
}
pub fn run() -> Result<()> {
enable_raw_mode()?;
// used for clearing the screen
execute!(io::stdout(), terminal::EnterAlternateScreen)?;
println!("{}", HELP);
let mut stdout = stdout();
if let Err(e) = Editor::print_events() {
println!("Error: {:?}\r", e);
}
disable_raw_mode()
}
}
|
