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| 1 | +use std::fmt; |
| 2 | + |
| 3 | +#[derive(Debug, PartialEq, Eq, Copy, Clone)] |
| 4 | +enum Kind { |
| 5 | + Dev, |
| 6 | + Nightly, |
| 7 | + Beta, |
| 8 | + Stable, |
| 9 | +} |
| 10 | + |
| 11 | +/// Release channel: "dev", "nightly", "beta", or "stable". |
| 12 | +#[derive(Debug, PartialEq, Eq, Copy, Clone)] |
| 13 | +pub struct Channel(Kind); |
| 14 | + |
| 15 | +impl Channel { |
| 16 | + /// Reads the release channel of the running compiler. If it cannot be |
| 17 | + /// determined (see the [top-level documentation](crate)), returns `None`. |
| 18 | + /// |
| 19 | + /// # Example |
| 20 | + /// |
| 21 | + /// ```rust |
| 22 | + /// use version_check::Channel; |
| 23 | + /// |
| 24 | + /// match Channel::read() { |
| 25 | + /// Some(c) => format!("The channel is: {}", c), |
| 26 | + /// None => format!("Failed to read the release channel.") |
| 27 | + /// }; |
| 28 | + /// ``` |
| 29 | + pub fn read() -> Option<Channel> { |
| 30 | + ::get_version_and_date() |
| 31 | + .and_then(|(version, _)| version) |
| 32 | + .and_then(|version| Channel::parse(&version)) |
| 33 | + } |
| 34 | + |
| 35 | + /// Parse a Rust release channel from a Rust release version string (of the |
| 36 | + /// form `major[.minor[.patch[-channel]]]`). Returns `None` if `version` is |
| 37 | + /// not a valid Rust version string. |
| 38 | + /// |
| 39 | + /// # Example |
| 40 | + /// |
| 41 | + /// ```rust |
| 42 | + /// use version_check::Channel; |
| 43 | + /// |
| 44 | + /// let dev = Channel::parse("1.3.0-dev").unwrap(); |
| 45 | + /// assert!(dev.is_dev()); |
| 46 | + /// |
| 47 | + /// let nightly = Channel::parse("1.42.2-nightly").unwrap(); |
| 48 | + /// assert!(nightly.is_nightly()); |
| 49 | + /// |
| 50 | + /// let beta = Channel::parse("1.32.0-beta").unwrap(); |
| 51 | + /// assert!(beta.is_beta()); |
| 52 | + /// |
| 53 | + /// let stable = Channel::parse("1.4.0").unwrap(); |
| 54 | + /// assert!(stable.is_stable()); |
| 55 | + /// ``` |
| 56 | + pub fn parse(version: &str) -> Option<Channel> { |
| 57 | + if version.contains("-dev") { |
| 58 | + Some(Channel(Kind::Dev)) |
| 59 | + } else if version.contains("-nightly") { |
| 60 | + Some(Channel(Kind::Nightly)) |
| 61 | + } else if version.contains("-beta") { |
| 62 | + Some(Channel(Kind::Beta)) |
| 63 | + } else if !version.contains("-") { |
| 64 | + Some(Channel(Kind::Stable)) |
| 65 | + } else { |
| 66 | + None |
| 67 | + } |
| 68 | + } |
| 69 | + |
| 70 | + /// Returns the name of the release channel. |
| 71 | + fn as_str(&self) -> &'static str { |
| 72 | + match self.0 { |
| 73 | + Kind::Dev => "dev", |
| 74 | + Kind::Beta => "beta", |
| 75 | + Kind::Nightly => "nightly", |
| 76 | + Kind::Stable => "stable", |
| 77 | + } |
| 78 | + } |
| 79 | + |
| 80 | + /// Returns `true` if this channel supports feature flags. In other words, |
| 81 | + /// returns `true` if the channel is either `dev` or `nightly`. |
| 82 | + /// |
| 83 | + /// # Example |
| 84 | + /// |
| 85 | + /// ```rust |
| 86 | + /// use version_check::Channel; |
| 87 | + /// |
| 88 | + /// let dev = Channel::parse("1.3.0-dev").unwrap(); |
| 89 | + /// assert!(dev.supports_features()); |
| 90 | + /// |
| 91 | + /// let nightly = Channel::parse("1.42.2-nightly").unwrap(); |
| 92 | + /// assert!(nightly.supports_features()); |
| 93 | + /// |
| 94 | + /// let beta = Channel::parse("1.32.0-beta").unwrap(); |
| 95 | + /// assert!(!beta.supports_features()); |
| 96 | + /// |
| 97 | + /// let stable = Channel::parse("1.4.0").unwrap(); |
| 98 | + /// assert!(!stable.supports_features()); |
| 99 | + /// ``` |
| 100 | + pub fn supports_features(&self) -> bool { |
| 101 | + match self.0 { |
| 102 | + Kind::Dev | Kind::Nightly => true, |
| 103 | + Kind::Beta | Kind::Stable => false |
| 104 | + } |
| 105 | + } |
| 106 | + |
| 107 | + /// Returns `true` if this channel is `dev` and `false` otherwise. |
| 108 | + /// |
| 109 | + /// # Example |
| 110 | + /// |
| 111 | + /// ```rust |
| 112 | + /// use version_check::Channel; |
| 113 | + /// |
| 114 | + /// let dev = Channel::parse("1.3.0-dev").unwrap(); |
| 115 | + /// assert!(dev.is_dev()); |
| 116 | + /// |
| 117 | + /// let stable = Channel::parse("1.0.0").unwrap(); |
| 118 | + /// assert!(!stable.is_dev()); |
| 119 | + /// ``` |
| 120 | + pub fn is_dev(&self) -> bool { |
| 121 | + match self.0 { |
| 122 | + Kind::Dev => true, |
| 123 | + _ => false |
| 124 | + } |
| 125 | + } |
| 126 | + |
| 127 | + /// Returns `true` if this channel is `nightly` and `false` otherwise. |
| 128 | + /// |
| 129 | + /// # Example |
| 130 | + /// |
| 131 | + /// ```rust |
| 132 | + /// use version_check::Channel; |
| 133 | + /// |
| 134 | + /// let nightly = Channel::parse("1.3.0-nightly").unwrap(); |
| 135 | + /// assert!(nightly.is_nightly()); |
| 136 | + /// |
| 137 | + /// let stable = Channel::parse("1.0.0").unwrap(); |
| 138 | + /// assert!(!stable.is_nightly()); |
| 139 | + /// ``` |
| 140 | + pub fn is_nightly(&self) -> bool { |
| 141 | + match self.0 { |
| 142 | + Kind::Nightly => true, |
| 143 | + _ => false |
| 144 | + } |
| 145 | + } |
| 146 | + |
| 147 | + /// Returns `true` if this channel is `beta` and `false` otherwise. |
| 148 | + /// |
| 149 | + /// # Example |
| 150 | + /// |
| 151 | + /// ```rust |
| 152 | + /// use version_check::Channel; |
| 153 | + /// |
| 154 | + /// let beta = Channel::parse("1.3.0-beta").unwrap(); |
| 155 | + /// assert!(beta.is_beta()); |
| 156 | + /// |
| 157 | + /// let stable = Channel::parse("1.0.0").unwrap(); |
| 158 | + /// assert!(!stable.is_beta()); |
| 159 | + /// ``` |
| 160 | + pub fn is_beta(&self) -> bool { |
| 161 | + match self.0 { |
| 162 | + Kind::Beta => true, |
| 163 | + _ => false |
| 164 | + } |
| 165 | + } |
| 166 | + |
| 167 | + /// Returns `true` if this channel is `stable` and `false` otherwise. |
| 168 | + /// |
| 169 | + /// # Example |
| 170 | + /// |
| 171 | + /// ```rust |
| 172 | + /// use version_check::Channel; |
| 173 | + /// |
| 174 | + /// let stable = Channel::parse("1.0.0").unwrap(); |
| 175 | + /// assert!(stable.is_stable()); |
| 176 | + /// |
| 177 | + /// let beta = Channel::parse("1.3.0-beta").unwrap(); |
| 178 | + /// assert!(!beta.is_stable()); |
| 179 | + /// ``` |
| 180 | + pub fn is_stable(&self) -> bool { |
| 181 | + match self.0 { |
| 182 | + Kind::Stable => true, |
| 183 | + _ => false |
| 184 | + } |
| 185 | + } |
| 186 | +} |
| 187 | + |
| 188 | +impl fmt::Display for Channel { |
| 189 | + fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { |
| 190 | + write!(f, "{}", self.as_str()) |
| 191 | + } |
| 192 | +} |
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