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
|
use ctrlc;
use std::fs;
use std::io;
use std::io::Write;
use std::process::Command;
fn eval(paths: &[&str], prompt: &str) {
let mut bins: Vec<String> = Vec::new();
for path in paths {
let files = fs::read_dir(path).expect("Unable to read files in your path");
for file in files {
bins.push(file.unwrap().path().display().to_string());
}
}
loop {
// Output the prompt
io::stdout().flush().unwrap();
print!("{}", prompt);
io::stdout().flush().unwrap();
// Wait for user input
let mut input = String::new();
let bytes = io::stdin()
.read_line(&mut input)
.expect("Unable to evaluate the input string");
// Check if we've reached EOF (i.e. <C-d>)
if bytes == 0 {
println!("");
break;
}
// Trim the input
let input = input.trim();
// Check if user wants to exit the shell
if input == "exit" || input == "quit" {
break;
}
// Parse command and arguments
let mut split = input.split(' ');
let cmd = match split.next() {
Some(str) if str.trim().is_empty() => continue,
Some(str) => str.trim(),
None => continue,
};
// Parse arguments
let mut args = vec![];
loop {
let next = split.next();
match next {
Some(str) => args.push(str),
None => break,
}
}
// Check if user wants to change directories
if cmd == "cd" {
let path = match args.first() {
Some(str) => str,
None => env!("HOME"),
};
match std::env::set_current_dir(path) {
Ok(_) => {}
Err(_) => {
println!("cd: Unable to change into {}", path);
continue;
}
}
continue;
}
// Check if the command exists
let cmd = match bins.iter().find(|b| b.split("/").last().unwrap() == cmd) {
Some(cmd) => cmd,
None => {
println!("Command not found");
continue;
}
};
// Run the command (and wait for it to finish)
let mut child = match Command::new(cmd).args(args).spawn() {
Ok(ch) => ch,
Err(_) => {
println!("Unable to fork");
continue;
}
};
child.wait().unwrap();
}
}
fn main() {
// Define paths
// TODO: Hardcoded path should only be the fallback
let paths = [
"/bin",
"/sbin",
"/usr/bin",
"/usr/sbin",
"/usr/local/bin",
"/usr/local/sbin",
];
// Set the prompt
let prompt = "|> ";
// Handle signals
ctrlc::set_handler(move || {
print!("\n{}", prompt);
io::stdout().flush().unwrap();
})
.expect("Unable to set <C-c> handler");
// Begin evaluating commands
eval(&paths, prompt);
}
|
