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
use std::{env, path};
const ARRET_ROOT_ENV_VAR: &str = "ARRET_ROOT";
fn is_arret_root(path: &path::Path) -> bool {
path.join("./.arret-root").is_file()
}
pub struct InvalidOptionError {
invalid_path: path::PathBuf,
}
impl InvalidOptionError {
pub fn invalid_path(&self) -> &path::Path {
&self.invalid_path
}
}
pub struct InvalidEnvVarError {
invalid_path: path::PathBuf,
}
impl InvalidEnvVarError {
pub fn env_var_name(&self) -> &'static str {
ARRET_ROOT_ENV_VAR
}
pub fn invalid_path(&self) -> &path::Path {
&self.invalid_path
}
}
pub enum FindArretRootError {
InvalidOption(InvalidOptionError),
InvalidEnvVar(InvalidEnvVarError),
NotFound,
}
pub fn find_arret_root(
arret_root_option: Option<&str>,
) -> Result<path::PathBuf, FindArretRootError> {
if let Some(arg_root) = arret_root_option {
let arg_path = path::PathBuf::from(arg_root);
if !is_arret_root(&arg_path) {
return Err(FindArretRootError::InvalidOption(InvalidOptionError {
invalid_path: arg_path,
}));
}
return Ok(arg_path);
}
if let Some(env_root) = env::var_os(ARRET_ROOT_ENV_VAR) {
let env_path = path::PathBuf::from(env_root);
if !is_arret_root(&env_path) {
return Err(FindArretRootError::InvalidEnvVar(InvalidEnvVarError {
invalid_path: env_path,
}));
}
return Ok(env_path);
}
if let Some(manifest_dir) = option_env!("CARGO_MANIFEST_DIR") {
for candidate in path::Path::new(manifest_dir).ancestors() {
if is_arret_root(candidate) {
return Ok(candidate.to_owned());
}
}
}
let current_dir = env::current_dir().expect("Cannot determine current directory");
for candidate in path::Path::new(¤t_dir).ancestors() {
if is_arret_root(candidate) {
return Ok(candidate.to_owned());
}
}
Err(FindArretRootError::NotFound)
}