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::path::{Path, PathBuf};
pub(super) fn looks_like_path(value: &str) -> bool {
value.contains('/') || value.contains('\\') || value.contains(':')
}
pub(super) fn expand_home_path(value: &str) -> PathBuf {
if value == "~" {
if let Some(home) = home_dir() {
return home;
}
} else if let Some(rest) = value
.strip_prefix("~/")
.or_else(|| value.strip_prefix("~\\"))
{
if let Some(home) = home_dir() {
return home.join(rest);
}
}
PathBuf::from(value)
}
fn home_dir() -> Option<PathBuf> {
std::env::var_os("HOME")
.or_else(|| std::env::var_os("USERPROFILE"))
.map(PathBuf::from)
}
pub(super) fn find_executable_in_path(program: &str) -> Option<PathBuf> {
let path = Path::new(program);
if looks_like_path(program) {
return path.is_file().then(|| path.to_path_buf());
}
let path_var = std::env::var_os("PATH")?;
let extensions = executable_extensions(program);
for directory in std::env::split_paths(&path_var) {
for extension in &extensions {
let candidate = directory.join(format!("{program}{extension}"));
if candidate.is_file() {
return Some(candidate);
}
}
}
None
}
fn executable_extensions(program: &str) -> Vec<String> {
if !cfg!(target_os = "windows") || Path::new(program).extension().is_some() {
return vec![String::new()];
}
let pathext = std::env::var("PATHEXT").unwrap_or_else(|_| ".COM;.EXE;.BAT;.CMD".to_string());
let mut extensions = vec![String::new()];
for extension in pathext.split(';') {
let extension = extension.trim();
if extension.is_empty() {
continue;
}
let normalized = if extension.starts_with('.') {
extension.to_string()
} else {
format!(".{extension}")
};
if !extensions.iter().any(|seen| seen == &normalized) {
extensions.push(normalized);
}
}
extensions
}