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
|
use std::fmt;
#[derive(Debug, PartialEq, Eq, Copy, Clone)]
enum Kind {
Dev,
Nightly,
Beta,
Stable,
}
/// Release channel: "dev", "nightly", "beta", or "stable".
#[derive(Debug, PartialEq, Eq, Copy, Clone)]
pub struct Channel(Kind);
impl Channel {
/// Reads the release channel of the running compiler. If it cannot be
/// determined (see the [top-level documentation](crate)), returns `None`.
///
/// # Example
///
/// ```rust
/// use version_check::Channel;
///
/// match Channel::read() {
/// Some(c) => format!("The channel is: {}", c),
/// None => format!("Failed to read the release channel.")
/// };
/// ```
pub fn read() -> Option<Channel> {
::get_version_and_date()
.and_then(|(version, _)| version)
.and_then(|version| Channel::parse(&version))
}
/// Parse a Rust release channel from a Rust release version string (of the
/// form `major[.minor[.patch[-channel]]]`). Returns `None` if `version` is
/// not a valid Rust version string.
///
/// # Example
///
/// ```rust
/// use version_check::Channel;
///
/// let dev = Channel::parse("1.3.0-dev").unwrap();
/// assert!(dev.is_dev());
///
/// let nightly = Channel::parse("1.42.2-nightly").unwrap();
/// assert!(nightly.is_nightly());
///
/// let beta = Channel::parse("1.32.0-beta").unwrap();
/// assert!(beta.is_beta());
///
/// let stable = Channel::parse("1.4.0").unwrap();
/// assert!(stable.is_stable());
/// ```
pub fn parse(version: &str) -> Option<Channel> {
let version = version.trim();
if version.contains("-dev") || version == "dev" {
Some(Channel(Kind::Dev))
} else if version.contains("-nightly") || version == "nightly" {
Some(Channel(Kind::Nightly))
} else if version.contains("-beta") || version == "beta" {
Some(Channel(Kind::Beta))
} else if !version.contains("-") {
Some(Channel(Kind::Stable))
} else {
None
}
}
/// Returns the name of the release channel.
fn as_str(&self) -> &'static str {
match self.0 {
Kind::Dev => "dev",
Kind::Beta => "beta",
Kind::Nightly => "nightly",
Kind::Stable => "stable",
}
}
/// Returns `true` if this channel supports feature flags. In other words,
/// returns `true` if the channel is either `dev` or `nightly`.
///
/// # Example
///
/// ```rust
/// use version_check::Channel;
///
/// let dev = Channel::parse("1.3.0-dev").unwrap();
/// assert!(dev.supports_features());
///
/// let nightly = Channel::parse("1.42.2-nightly").unwrap();
/// assert!(nightly.supports_features());
///
/// let beta = Channel::parse("1.32.0-beta").unwrap();
/// assert!(!beta.supports_features());
///
/// let stable = Channel::parse("1.4.0").unwrap();
/// assert!(!stable.supports_features());
/// ```
pub fn supports_features(&self) -> bool {
match self.0 {
Kind::Dev | Kind::Nightly => true,
Kind::Beta | Kind::Stable => false
}
}
/// Returns `true` if this channel is `dev` and `false` otherwise.
///
/// # Example
///
/// ```rust
/// use version_check::Channel;
///
/// let dev = Channel::parse("1.3.0-dev").unwrap();
/// assert!(dev.is_dev());
///
/// let stable = Channel::parse("1.0.0").unwrap();
/// assert!(!stable.is_dev());
/// ```
pub fn is_dev(&self) -> bool {
match self.0 {
Kind::Dev => true,
_ => false
}
}
/// Returns `true` if this channel is `nightly` and `false` otherwise.
///
/// # Example
///
/// ```rust
/// use version_check::Channel;
///
/// let nightly = Channel::parse("1.3.0-nightly").unwrap();
/// assert!(nightly.is_nightly());
///
/// let stable = Channel::parse("1.0.0").unwrap();
/// assert!(!stable.is_nightly());
/// ```
pub fn is_nightly(&self) -> bool {
match self.0 {
Kind::Nightly => true,
_ => false
}
}
/// Returns `true` if this channel is `beta` and `false` otherwise.
///
/// # Example
///
/// ```rust
/// use version_check::Channel;
///
/// let beta = Channel::parse("1.3.0-beta").unwrap();
/// assert!(beta.is_beta());
///
/// let stable = Channel::parse("1.0.0").unwrap();
/// assert!(!stable.is_beta());
/// ```
pub fn is_beta(&self) -> bool {
match self.0 {
Kind::Beta => true,
_ => false
}
}
/// Returns `true` if this channel is `stable` and `false` otherwise.
///
/// # Example
///
/// ```rust
/// use version_check::Channel;
///
/// let stable = Channel::parse("1.0.0").unwrap();
/// assert!(stable.is_stable());
///
/// let beta = Channel::parse("1.3.0-beta").unwrap();
/// assert!(!beta.is_stable());
/// ```
pub fn is_stable(&self) -> bool {
match self.0 {
Kind::Stable => true,
_ => false
}
}
}
impl fmt::Display for Channel {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{}", self.as_str())
}
}
|
