blob: e176dc0f6eb268d3706038b9059426b05e2e2530 (
plain)
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
|
pub mod error;
use error::Error;
use std::io;
use std::io::prelude::*;
pub type Result<T> = std::result::Result<T, Error>;
pub enum Input {
String(String),
End,
}
fn main() -> Result<()> {
std::process::exit(match repl() {
Ok(()) => 0,
Err(ref e) => {
eprintln!("{}", e);
1
}
})
}
fn repl() -> Result<()> {
println!("Hello, terminal!");
loop {
prompt()?;
let input = read()?;
match input {
Input::String(string) => execute(string)?,
Input::End => break,
}
}
Ok(())
}
fn prompt() -> Result<()> {
print!("$ ");
io::stdout().flush()?;
Ok(())
}
fn read() -> Result<Input> {
let mut input = String::new();
let n_bytes = io::stdin().read_line(&mut input)?;
if n_bytes == 0 {
Ok(Input::End)
} else {
Ok(Input::String(input))
}
}
fn execute(input: String) -> Result<()> {
println!("{}", input);
Ok(())
}
|