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
|
// Copyleft (ɔ) 2021-2021 The Whirlsplash Collective
// SPDX-License-Identifier: GPL-3.0-only
mod builtins;
mod structure;
use std::{io, io::Write, str::FromStr};
use crate::prompt::{
builtins::{builtin_echo, BuiltIn},
structure::Command,
};
pub struct Prompt;
impl Prompt {
pub fn handle() {
Prompt::write_prompt();
Prompt::process_command(Prompt::tokenize_command(Prompt::read_command()));
}
fn write_prompt() {
print!("> ");
io::stdout().flush().unwrap();
}
fn read_command() -> String {
let mut input = String::new();
io::stdin()
.read_line(&mut input)
.expect("failed to read command from stdin");
input
}
fn tokenize_command(c: String) -> Command {
let mut command_split: Vec<String> = c.split_whitespace().map(|s| s.to_string()).collect();
Command {
keyword: command_split.remove(0),
args: command_split,
}
}
fn process_command(c: Command) -> i32 {
match BuiltIn::from_str(&c.keyword) {
Ok(BuiltIn::Echo) => builtin_echo(&c.args),
Ok(BuiltIn::Exit) => std::process::exit(0),
_ => {
println!("{}: command not found", &c.keyword);
1
}
}
}
}
#[cfg(test)]
mod tokenize_command {
use crate::prompt::Prompt;
#[test]
#[ignore]
fn empty_command() { assert_eq!("", Prompt::tokenize_command("".to_string()).keyword) }
#[test]
fn test_keyword() { assert_eq!("test", Prompt::tokenize_command("test".to_string()).keyword) }
#[test]
fn no_arg() { assert_eq!(0, Prompt::tokenize_command("test".to_string()).args.len()) }
#[test]
fn one_arg() {
assert_eq!(
1,
Prompt::tokenize_command("test one".to_string()).args.len()
)
}
#[test]
fn multi_arg() {
assert_eq!(
3,
Prompt::tokenize_command("test one two three".to_string())
.args
.len()
)
}
#[test]
#[ignore]
fn quotes() {
assert_eq!(
2,
Prompt::tokenize_command("test \"one two\" three".to_string())
.args
.len()
)
}
}
|