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
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
|
use std::ffi::OsStr;
use std::io::{self, IsTerminal, Read, Write};
use std::os::unix::ffi::OsStrExt;
use std::os::unix::io::AsRawFd;
use std::path::Path;
use std::process::{Child, Command, Stdio};
pub mod cursor;
pub mod linebuf;
pub mod panic;
pub mod parse;
pub mod raw;
use linebuf::LineBuf;
use raw::*;
use crate::cursor::{Direction, move_cursor};
use crate::parse::Ast;
macro_rules! print {
($($x:tt)*) => {{
write!(io::stdout(), $($x)*).unwrap();
io::stdout().flush().unwrap();
}}
}
macro_rules! println {
() => {{
println!("")
}};
($($x:tt)*) => {{
write!(io::stdout(), $($x)*).unwrap();
write!(io::stdout(), "\r\n").unwrap();
io::stdout().flush().unwrap();
}};
}
const PROMPT: &str = "> ";
fn run_command(raw: &ScopedRawMode, line: Vec<u8>) {
let parsed = parse::do_parse(&line);
let parsed = match parsed {
Ok(p) => p,
Err(err) => {
print!("{err:?}\r\n{PROMPT}");
return;
}
};
let Ast::Pipes(pipes) = parsed else {
todo!("can only handle pipes");
};
// simple command that can probably be builtin
// TODO: handle builtins uniformly instead of big if case
if pipes.cmds.len() == 1 {
let c = &pipes.cmds[0];
match &c.cmd[..] {
b"cd" => {
let target: &Path = match c.args.get(0).map(|v| &v[..]) {
Some(b"-") => todo!("prev"),
Some(path) => OsStr::from_bytes(path).as_ref(),
None => todo!("homedir"),
};
if let Err(_) = std::env::set_current_dir(target) {
print!("ERR {PROMPT}");
} else {
print!("{PROMPT}");
}
return;
}
b"from" => todo!("read from file"),
b"to" | b"into" => todo!("write into file"),
b"append" => todo!("append to file"),
_ => (),
}
}
let mut children: Vec<Child> = Vec::new();
let mut prev_stdout = None;
let mut spawn_error = false;
raw.disable();
for (i, cmd) in pipes.cmds.iter().enumerate() {
let mut command = Command::new(OsStr::from_bytes(&cmd.cmd));
for arg in cmd.args.iter() {
command.arg(OsStr::from_bytes(arg));
}
if let Some(stdout) = prev_stdout.take() {
command.stdin(Stdio::from(stdout));
}
if i < pipes.cmds.len() - 1 {
command.stdout(Stdio::piped());
}
let mut child = match command.spawn() {
Ok(c) => c,
Err(e) => {
println!("failed to spawn {:?} - {e:?}", OsStr::from_bytes(&cmd.cmd));
spawn_error = true;
break;
}
};
prev_stdout = child.stdout.take();
children.push(child);
}
let status_string;
if spawn_error {
for child in children.iter_mut() {
if let Err(e) = child.kill() {
println!("failed to kill child - {e:?}");
}
}
status_string = "ERR".into();
} else {
let mut code = 0;
for mut child in children {
match child.wait() {
Ok(ec) => {
if let Some(c) = ec.code() {
code = c;
}
}
Err(e) => {
println!("failed to wait for child - {e:?}")
}
}
}
if code == 0 {
status_string = String::new();
} else {
status_string = format!("{code}");
}
}
raw.enable();
print!("\r{status_string}{PROMPT}");
}
fn main() {
crate::panic::hook();
let stdin = io::stdin();
let stdout = io::stdout();
if !stdin.is_terminal() {
println!("need to run in a tty");
return;
}
let fd = stdin.as_raw_fd();
let raw = ScopedRawMode::on_fd(fd);
raw.enable();
let mut stdin = stdin.lock();
let mut stdout = stdout.lock();
let mut buffer = [0u8; 1];
let mut line = LineBuf::new();
let mut history = Vec::new();
print!("{PROMPT}");
loop {
let Ok(_) = stdin.read_exact(&mut buffer) else {
break;
};
match buffer[0] {
// EOF
4 => {
break;
}
// Enter
b'\r' => {
let line = line.dump();
if !line.is_empty() {
print!("\r\n");
history.push(line.clone());
run_command(&raw, line);
}
}
// Backspace (127 on most systems)
127 => {
if line.del_left().is_some() {
print!("\x08 \x08");
}
}
// Escape sequence
27 => {
let mut seq = [0u8; 2];
stdin.read_exact(&mut seq).unwrap();
if seq[0] == b'[' {
match seq[1] {
b'A' => {
// up
}
b'B' => {
// down
}
b'C' => {
move_cursor(Direction::Right, 1);
line.right();
}
b'D' => {
move_cursor(Direction::Left, 1);
line.left();
}
x => todo!("escape character {x}"),
}
}
}
b'|' if line.is_empty() && !history.is_empty() => {
let mut cmd = history[history.len() - 1].clone();
cmd.extend_from_slice(b" | ");
io::stdout().write_all(&cmd).unwrap();
io::stdout().flush().unwrap();
line.set_content(cmd);
}
// Normal character
x => {
line.add(x);
stdout.write_all(&[x]).unwrap();
line.display_post();
}
}
}
raw.disable();
println!("bye");
}
|
