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
use std::path::{Path, PathBuf};
use bstr::{BStr, BString, ByteSlice};
use quick_error::quick_error;
#[derive(PartialEq, Eq, Debug, Hash, Ord, PartialOrd, Clone)]
#[cfg_attr(feature = "serde1", derive(serde::Serialize, serde::Deserialize))]
pub enum ForUser {
Current,
Name(BString),
}
impl From<ForUser> for Option<BString> {
fn from(v: ForUser) -> Self {
match v {
ForUser::Name(user) => Some(user),
ForUser::Current => None,
}
}
}
quick_error! {
#[derive(Debug)]
pub enum Error {
Utf8(err: bstr::Utf8Error) {
display("UTF8 conversion on non-unix system failed")
from()
source(err)
}
MissingHome(user: Option<BString>) {
display("Home directory could not be obtained for {}", match user {Some(user) => format!("user '{}'", user), None => "current user".into()})
}
}
}
fn path_segments(path: &BStr) -> Option<impl Iterator<Item = &[u8]>> {
if path.starts_with(b"/") {
Some(path[1..].split(|c| *c == b'/'))
} else {
None
}
}
pub fn parse(path: &BStr) -> Result<(Option<ForUser>, BString), Error> {
Ok(path_segments(path)
.and_then(|mut iter| {
iter.next().map(|segment| {
if segment.starts_with(b"~") {
let eu = if segment.len() == 1 {
Some(ForUser::Current)
} else {
Some(ForUser::Name(segment[1..].into()))
};
(
eu,
format!(
"/{}",
iter.map(|s| s.as_bstr().to_str_lossy()).collect::<Vec<_>>().join("/")
)
.into(),
)
} else {
(None, path.into())
}
})
})
.unwrap_or_else(|| (None, path.into())))
}
pub fn for_shell(path: BString) -> BString {
use bstr::ByteVec;
match parse(path.as_slice().as_bstr()) {
Ok((user, mut path)) => match user {
Some(ForUser::Current) => {
path.insert(0, b'~');
path
}
Some(ForUser::Name(mut user)) => {
user.insert(0, b'~');
user.append(path.as_vec_mut());
user
}
None => path,
},
Err(_) => path,
}
}
pub fn with(
user: Option<&ForUser>,
path: &BStr,
home_for_user: impl FnOnce(&ForUser) -> Option<PathBuf>,
) -> Result<PathBuf, Error> {
fn make_relative(path: &Path) -> PathBuf {
path.components().skip(1).collect()
}
let path = path.to_path()?;
Ok(match user {
Some(user) => home_for_user(user)
.ok_or_else(|| Error::MissingHome(user.to_owned().into()))?
.join(make_relative(path)),
None => path.into(),
})
}
pub fn expand_path(user: Option<&ForUser>, path: &BStr) -> Result<PathBuf, Error> {
with(user, path, |user| match user {
ForUser::Current => home::home_dir(),
ForUser::Name(user) => {
home::home_dir().and_then(|home| home.parent().map(|home_dirs| home_dirs.join(user.to_string())))
}
})
}