--- /dev/null
+{
+ "git": {
+ "sha1": "736b788c9c32c93b545cb084eac6f94f31f2872c"
+ },
+ "path_in_vcs": ""
+}
\ No newline at end of file
--- /dev/null
+name: CI
+
+on: [push, pull_request]
+
+env:
+ CARGO_TERM_COLOR: always
+
+jobs:
+ test:
+ name: "${{ matrix.os.name }} ${{ matrix.test.name }} (${{ matrix.toolchain }})"
+
+ strategy:
+ matrix:
+ os:
+ - { name: Linux, distro: ubuntu-latest }
+ - { name: Windows, distro: windows-latest }
+ - { name: macOS, distro: macOS-latest }
+ toolchain: [nightly, beta, stable]
+ include:
+ - os: { name: Linux, distro: ubuntu-latest }
+ toolchain: 1.0.0
+
+ runs-on: ${{ matrix.os.distro }}
+
+ steps:
+ - name: Checkout Sources
+ uses: actions/checkout@v2
+
+ - name: Install Rust
+ uses: actions-rs/toolchain@v1
+ with:
+ profile: minimal
+ toolchain: ${{ matrix.toolchain }}
+ override: true
+
+ - name: Run Tests
+ uses: actions-rs/cargo@v1
+ env:
+ FORCE_STATIC: 1
+ KNOWN_CHANNEL: ${{ matrix.toolchain }}
+ with:
+ command: test
--- /dev/null
+target
+Cargo.lock
--- /dev/null
+language: rust
+rust:
+ - 1.0.0
+ - stable
+ - beta
+ - nightly
--- /dev/null
+# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
+#
+# When uploading crates to the registry Cargo will automatically
+# "normalize" Cargo.toml files for maximal compatibility
+# with all versions of Cargo and also rewrite `path` dependencies
+# to registry (e.g., crates.io) dependencies.
+#
+# If you are reading this file be aware that the original Cargo.toml
+# will likely look very different (and much more reasonable).
+# See Cargo.toml.orig for the original contents.
+
+[package]
+name = "version_check"
+version = "0.9.4"
+authors = ["Sergio Benitez <sb@sergio.bz>"]
+exclude = ["static"]
+description = "Tiny crate to check the version of the installed/running rustc."
+documentation = "https://docs.rs/version_check/"
+readme = "README.md"
+keywords = ["version", "rustc", "minimum", "check"]
+license = "MIT/Apache-2.0"
+repository = "https://github.com/SergioBenitez/version_check"
+
+[dependencies]
--- /dev/null
+[package]
+name = "version_check"
+version = "0.9.4"
+authors = ["Sergio Benitez <sb@sergio.bz>"]
+description = "Tiny crate to check the version of the installed/running rustc."
+documentation = "https://docs.rs/version_check/"
+repository = "https://github.com/SergioBenitez/version_check"
+readme = "README.md"
+keywords = ["version", "rustc", "minimum", "check"]
+license = "MIT/Apache-2.0"
+exclude = ["static"]
+
+[dependencies]
--- /dev/null
+ Apache License
+ Version 2.0, January 2004
+ http://www.apache.org/licenses/
+
+TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
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+ any Contribution intentionally submitted for inclusion in the Work
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+ Notwithstanding the above, nothing herein shall supersede or modify
+ the terms of any separate license agreement you may have executed
+ with Licensor regarding such Contributions.
+
+6. Trademarks. This License does not grant permission to use the trade
+ names, trademarks, service marks, or product names of the Licensor,
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+ origin of the Work and reproducing the content of the NOTICE file.
+
+7. Disclaimer of Warranty. Unless required by applicable law or
+ agreed to in writing, Licensor provides the Work (and each
+ Contributor provides its Contributions) on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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+ appropriateness of using or redistributing the Work and assume any
+ risks associated with Your exercise of permissions under this License.
+
+8. Limitation of Liability. In no event and under no legal theory,
+ whether in tort (including negligence), contract, or otherwise,
+ unless required by applicable law (such as deliberate and grossly
+ negligent acts) or agreed to in writing, shall any Contributor be
+ liable to You for damages, including any direct, indirect, special,
+ incidental, or consequential damages of any character arising as a
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+ has been advised of the possibility of such damages.
+
+9. Accepting Warranty or Additional Liability. While redistributing
+ the Work or Derivative Works thereof, You may choose to offer,
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+ on Your own behalf and on Your sole responsibility, not on behalf
+ of any other Contributor, and only if You agree to indemnify,
+ defend, and hold each Contributor harmless for any liability
+ incurred by, or claims asserted against, such Contributor by reason
+ of your accepting any such warranty or additional liability.
+
+END OF TERMS AND CONDITIONS
+
+APPENDIX: How to apply the Apache License to your work.
+
+ To apply the Apache License to your work, attach the following
+ boilerplate notice, with the fields enclosed by brackets "[]"
+ replaced with your own identifying information. (Don't include
+ the brackets!) The text should be enclosed in the appropriate
+ comment syntax for the file format. We also recommend that a
+ file or class name and description of purpose be included on the
+ same "printed page" as the copyright notice for easier
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+
+Copyright [yyyy] [name of copyright owner]
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
--- /dev/null
+The MIT License (MIT)
+Copyright (c) 2017-2018 Sergio Benitez
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
--- /dev/null
+# version\_check
+
+[](https://github.com/SergioBenitez/version_check/actions)
+[](https://crates.io/crates/version_check)
+[](https://docs.rs/version_check)
+
+This tiny crate checks that the running or installed `rustc` meets some version
+requirements. The version is queried by calling the Rust compiler with
+`--version`. The path to the compiler is determined first via the `RUSTC`
+environment variable. If it is not set, then `rustc` is used. If that fails, no
+determination is made, and calls return `None`.
+
+## Usage
+
+Add to your `Cargo.toml` file, typically as a build dependency:
+
+```toml
+[build-dependencies]
+version_check = "0.9"
+```
+
+`version_check` is compatible and compiles with Rust 1.0.0 and beyond.
+
+## Examples
+
+Set a `cfg` flag in `build.rs` if the running compiler was determined to be
+at least version `1.13.0`:
+
+```rust
+extern crate version_check as rustc;
+
+if rustc::is_min_version("1.13.0").unwrap_or(false) {
+ println!("cargo:rustc-cfg=question_mark_operator");
+}
+```
+
+Check that the running compiler was released on or after `2018-12-18`:
+
+```rust
+extern crate version_check as rustc;
+
+match rustc::is_min_date("2018-12-18") {
+ Some(true) => "Yep! It's recent!",
+ Some(false) => "No, it's older.",
+ None => "Couldn't determine the rustc version."
+};
+```
+
+Check that the running compiler supports feature flags:
+
+```rust
+extern crate version_check as rustc;
+
+match rustc::is_feature_flaggable() {
+ Some(true) => "Yes! It's a dev or nightly release!",
+ Some(false) => "No, it's stable or beta.",
+ None => "Couldn't determine the rustc version."
+};
+```
+
+See the [rustdocs](https://docs.rs/version_check) for more examples and complete
+documentation.
+
+## Alternatives
+
+This crate is dead simple with no dependencies. If you need something more and
+don't care about panicking if the version cannot be obtained, or if you don't
+mind adding dependencies, see [rustc_version]. If you'd instead prefer a feature
+detection library that works by dynamically invoking `rustc` with a
+representative code sample, see [autocfg].
+
+[rustc_version]: https://crates.io/crates/rustc_version
+[autocfg]: https://crates.io/crates/autocfg
+
+## License
+
+`version_check` is licensed under either of the following, at your option:
+
+ * Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
+ * MIT License ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
--- /dev/null
+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())
+ }
+}
--- /dev/null
+use std::fmt;
+
+/// Release date including year, month, and day.
+// Internal storage is: y[31..9] | m[8..5] | d[5...0].
+#[derive(Debug, PartialEq, Eq, Copy, Clone, PartialOrd, Ord)]
+pub struct Date(u32);
+
+impl Date {
+ /// Reads the release date of the running compiler. If it cannot be
+ /// determined (see the [top-level documentation](crate)), returns `None`.
+ ///
+ /// # Example
+ ///
+ /// ```rust
+ /// use version_check::Date;
+ ///
+ /// match Date::read() {
+ /// Some(d) => format!("The release date is: {}", d),
+ /// None => format!("Failed to read the release date.")
+ /// };
+ /// ```
+ pub fn read() -> Option<Date> {
+ ::get_version_and_date()
+ .and_then(|(_, date)| date)
+ .and_then(|date| Date::parse(&date))
+ }
+
+ /// Parse a release date of the form `%Y-%m-%d`. Returns `None` if `date` is
+ /// not in `%Y-%m-%d` format.
+ ///
+ /// # Example
+ ///
+ /// ```rust
+ /// use version_check::Date;
+ ///
+ /// let date = Date::parse("2016-04-20").unwrap();
+ ///
+ /// assert!(date.at_least("2016-01-10"));
+ /// assert!(date.at_most("2016-04-20"));
+ /// assert!(date.exactly("2016-04-20"));
+ ///
+ /// assert!(Date::parse("2021-12-31").unwrap().exactly("2021-12-31"));
+ ///
+ /// assert!(Date::parse("March 13, 2018").is_none());
+ /// assert!(Date::parse("1-2-3-4-5").is_none());
+ /// assert!(Date::parse("2020-300-23120").is_none());
+ /// assert!(Date::parse("2020-12-12 1").is_none());
+ /// assert!(Date::parse("2020-10").is_none());
+ /// assert!(Date::parse("2020").is_none());
+ /// ```
+ pub fn parse(date: &str) -> Option<Date> {
+ let mut ymd = [0u16; 3];
+ for (i, split) in date.split('-').map(|s| s.parse::<u16>()).enumerate() {
+ ymd[i] = match (i, split) {
+ (3, _) | (_, Err(_)) => return None,
+ (_, Ok(v)) => v,
+ };
+ }
+
+ let (year, month, day) = (ymd[0], ymd[1], ymd[2]);
+ if year == 0 || month == 0 || month > 12 || day == 0 || day > 31 {
+ return None;
+ }
+
+ Some(Date::from_ymd(year, month as u8, day as u8))
+ }
+
+ /// Creates a `Date` from `(year, month, day)` date components.
+ ///
+ /// Does not check the validity of `year`, `month`, or `day`, but `year` is
+ /// truncated to 23 bits (% 8,388,608), `month` to 4 bits (% 16), and `day`
+ /// to 5 bits (% 32).
+ ///
+ /// # Example
+ ///
+ /// ```rust
+ /// use version_check::Date;
+ ///
+ /// assert!(Date::from_ymd(2021, 7, 30).exactly("2021-07-30"));
+ /// assert!(Date::from_ymd(2010, 3, 23).exactly("2010-03-23"));
+ /// assert!(Date::from_ymd(2090, 1, 31).exactly("2090-01-31"));
+ ///
+ /// // Truncation: 33 % 32 == 0x21 & 0x1F == 1.
+ /// assert!(Date::from_ymd(2090, 1, 33).exactly("2090-01-01"));
+ /// ```
+ pub fn from_ymd(year: u16, month: u8, day: u8) -> Date {
+ let year = (year as u32) << 9;
+ let month = ((month as u32) & 0xF) << 5;
+ let day = (day as u32) & 0x1F;
+ Date(year | month | day)
+ }
+
+ /// Return the original (YYYY, MM, DD).
+ fn to_ymd(&self) -> (u16, u8, u8) {
+ let y = self.0 >> 9;
+ let m = (self.0 >> 5) & 0xF;
+ let d = self.0 & 0x1F;
+ (y as u16, m as u8, d as u8)
+ }
+
+ /// Returns `true` if `self` occurs on or after `date`.
+ ///
+ /// If `date` occurs before `self`, or if `date` is not in `%Y-%m-%d`
+ /// format, returns `false`.
+ ///
+ /// # Example
+ ///
+ /// ```rust
+ /// use version_check::Date;
+ ///
+ /// let date = Date::parse("2020-01-01").unwrap();
+ ///
+ /// assert!(date.at_least("2019-12-31"));
+ /// assert!(date.at_least("2020-01-01"));
+ /// assert!(date.at_least("2014-04-31"));
+ ///
+ /// assert!(!date.at_least("2020-01-02"));
+ /// assert!(!date.at_least("2024-08-18"));
+ /// ```
+ pub fn at_least(&self, date: &str) -> bool {
+ Date::parse(date)
+ .map(|date| self >= &date)
+ .unwrap_or(false)
+ }
+
+ /// Returns `true` if `self` occurs on or before `date`.
+ ///
+ /// If `date` occurs after `self`, or if `date` is not in `%Y-%m-%d`
+ /// format, returns `false`.
+ ///
+ /// # Example
+ ///
+ /// ```rust
+ /// use version_check::Date;
+ ///
+ /// let date = Date::parse("2020-01-01").unwrap();
+ ///
+ /// assert!(date.at_most("2020-01-01"));
+ /// assert!(date.at_most("2020-01-02"));
+ /// assert!(date.at_most("2024-08-18"));
+ ///
+ /// assert!(!date.at_most("2019-12-31"));
+ /// assert!(!date.at_most("2014-04-31"));
+ /// ```
+ pub fn at_most(&self, date: &str) -> bool {
+ Date::parse(date)
+ .map(|date| self <= &date)
+ .unwrap_or(false)
+ }
+
+ /// Returns `true` if `self` occurs exactly on `date`.
+ ///
+ /// If `date` is not exactly `self`, or if `date` is not in `%Y-%m-%d`
+ /// format, returns `false`.
+ ///
+ /// # Example
+ ///
+ /// ```rust
+ /// use version_check::Date;
+ ///
+ /// let date = Date::parse("2020-01-01").unwrap();
+ ///
+ /// assert!(date.exactly("2020-01-01"));
+ ///
+ /// assert!(!date.exactly("2019-12-31"));
+ /// assert!(!date.exactly("2014-04-31"));
+ /// assert!(!date.exactly("2020-01-02"));
+ /// assert!(!date.exactly("2024-08-18"));
+ /// ```
+ pub fn exactly(&self, date: &str) -> bool {
+ Date::parse(date)
+ .map(|date| self == &date)
+ .unwrap_or(false)
+ }
+}
+
+impl fmt::Display for Date {
+ fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+ let (y, m, d) = self.to_ymd();
+ write!(f, "{}-{:02}-{:02}", y, m, d)
+ }
+}
+
+#[cfg(test)]
+mod tests {
+ use super::Date;
+
+ macro_rules! reflexive_display {
+ ($string:expr) => (
+ assert_eq!(Date::parse($string).unwrap().to_string(), $string);
+ )
+ }
+
+ #[test]
+ fn display() {
+ reflexive_display!("2019-05-08");
+ reflexive_display!("2000-01-01");
+ reflexive_display!("2000-12-31");
+ reflexive_display!("2090-12-31");
+ reflexive_display!("1999-02-19");
+ reflexive_display!("9999-12-31");
+ }
+}
--- /dev/null
+//! This tiny crate checks that the running or installed `rustc` meets some
+//! version requirements. The version is queried by calling the Rust compiler
+//! with `--version`. The path to the compiler is determined first via the
+//! `RUSTC` environment variable. If it is not set, then `rustc` is used. If
+//! that fails, no determination is made, and calls return `None`.
+//!
+//! # Examples
+//!
+//! * Set a `cfg` flag in `build.rs` if the running compiler was determined to
+//! be at least version `1.13.0`:
+//!
+//! ```rust
+//! extern crate version_check as rustc;
+//!
+//! if rustc::is_min_version("1.13.0").unwrap_or(false) {
+//! println!("cargo:rustc-cfg=question_mark_operator");
+//! }
+//! ```
+//!
+//! See [`is_max_version`] or [`is_exact_version`] to check if the compiler
+//! is _at most_ or _exactly_ a certain version.
+//!
+//! * Check that the running compiler was released on or after `2018-12-18`:
+//!
+//! ```rust
+//! extern crate version_check as rustc;
+//!
+//! match rustc::is_min_date("2018-12-18") {
+//! Some(true) => "Yep! It's recent!",
+//! Some(false) => "No, it's older.",
+//! None => "Couldn't determine the rustc version."
+//! };
+//! ```
+//!
+//! See [`is_max_date`] or [`is_exact_date`] to check if the compiler was
+//! released _prior to_ or _exactly on_ a certain date.
+//!
+//! * Check that the running compiler supports feature flags:
+//!
+//! ```rust
+//! extern crate version_check as rustc;
+//!
+//! match rustc::is_feature_flaggable() {
+//! Some(true) => "Yes! It's a dev or nightly release!",
+//! Some(false) => "No, it's stable or beta.",
+//! None => "Couldn't determine the rustc version."
+//! };
+//! ```
+//!
+//! * Check that the running compiler supports a specific feature:
+//!
+//! ```rust
+//! extern crate version_check as rustc;
+//!
+//! if let Some(true) = rustc::supports_feature("doc_cfg") {
+//! println!("cargo:rustc-cfg=has_doc_cfg");
+//! }
+//! ```
+//!
+//! * Check that the running compiler is on the stable channel:
+//!
+//! ```rust
+//! extern crate version_check as rustc;
+//!
+//! match rustc::Channel::read() {
+//! Some(c) if c.is_stable() => format!("Yes! It's stable."),
+//! Some(c) => format!("No, the channel {} is not stable.", c),
+//! None => format!("Couldn't determine the rustc version.")
+//! };
+//! ```
+//!
+//! To interact with the version, release date, and release channel as structs,
+//! use [`Version`], [`Date`], and [`Channel`], respectively. The [`triple()`]
+//! function returns all three values efficiently.
+//!
+//! # Alternatives
+//!
+//! This crate is dead simple with no dependencies. If you need something more
+//! and don't care about panicking if the version cannot be obtained, or if you
+//! don't mind adding dependencies, see
+//! [rustc_version](https://crates.io/crates/rustc_version).
+
+#![allow(deprecated)]
+
+mod version;
+mod channel;
+mod date;
+
+use std::env;
+use std::process::Command;
+
+#[doc(inline)] pub use version::*;
+#[doc(inline)] pub use channel::*;
+#[doc(inline)] pub use date::*;
+
+/// Parses (version, date) as available from rustc version string.
+fn version_and_date_from_rustc_version(s: &str) -> (Option<String>, Option<String>) {
+ let last_line = s.lines().last().unwrap_or(s);
+ let mut components = last_line.trim().split(" ");
+ let version = components.nth(1);
+ let date = components.filter(|c| c.ends_with(')')).next()
+ .map(|s| s.trim_right().trim_right_matches(")").trim_left().trim_left_matches('('));
+ (version.map(|s| s.to_string()), date.map(|s| s.to_string()))
+}
+
+/// Parses (version, date) as available from rustc verbose version output.
+fn version_and_date_from_rustc_verbose_version(s: &str) -> (Option<String>, Option<String>) {
+ let (mut version, mut date) = (None, None);
+ for line in s.lines() {
+ let split = |s: &str| s.splitn(2, ":").nth(1).map(|s| s.trim().to_string());
+ match line.trim().split(" ").nth(0) {
+ Some("rustc") => {
+ let (v, d) = version_and_date_from_rustc_version(line);
+ version = version.or(v);
+ date = date.or(d);
+ },
+ Some("release:") => version = split(line),
+ Some("commit-date:") if line.ends_with("unknown") => date = None,
+ Some("commit-date:") => date = split(line),
+ _ => continue
+ }
+ }
+
+ (version, date)
+}
+
+/// Returns (version, date) as available from `rustc --version`.
+fn get_version_and_date() -> Option<(Option<String>, Option<String>)> {
+ let rustc = env::var("RUSTC").unwrap_or_else(|_| "rustc".to_string());
+ Command::new(rustc).arg("--verbose").arg("--version").output().ok()
+ .and_then(|output| String::from_utf8(output.stdout).ok())
+ .map(|s| version_and_date_from_rustc_verbose_version(&s))
+}
+
+/// Reads the triple of [`Version`], [`Channel`], and [`Date`] of the installed
+/// or running `rustc`.
+///
+/// If any attribute cannot be determined (see the [top-level
+/// documentation](crate)), returns `None`.
+///
+/// To obtain only one of three attributes, use [`Version::read()`],
+/// [`Channel::read()`], or [`Date::read()`].
+pub fn triple() -> Option<(Version, Channel, Date)> {
+ let (version_str, date_str) = match get_version_and_date() {
+ Some((Some(version), Some(date))) => (version, date),
+ _ => return None
+ };
+
+ // Can't use `?` or `try!` for `Option` in 1.0.0.
+ match Version::parse(&version_str) {
+ Some(version) => match Channel::parse(&version_str) {
+ Some(channel) => match Date::parse(&date_str) {
+ Some(date) => Some((version, channel, date)),
+ _ => None,
+ },
+ _ => None,
+ },
+ _ => None
+ }
+}
+
+/// Checks that the running or installed `rustc` was released **on or after**
+/// some date.
+///
+/// The format of `min_date` must be YYYY-MM-DD. For instance: `2016-12-20` or
+/// `2017-01-09`.
+///
+/// If the date cannot be retrieved or parsed, or if `min_date` could not be
+/// parsed, returns `None`. Otherwise returns `true` if the installed `rustc`
+/// was release on or after `min_date` and `false` otherwise.
+pub fn is_min_date(min_date: &str) -> Option<bool> {
+ match (Date::read(), Date::parse(min_date)) {
+ (Some(rustc_date), Some(min_date)) => Some(rustc_date >= min_date),
+ _ => None
+ }
+}
+
+/// Checks that the running or installed `rustc` was released **on or before**
+/// some date.
+///
+/// The format of `max_date` must be YYYY-MM-DD. For instance: `2016-12-20` or
+/// `2017-01-09`.
+///
+/// If the date cannot be retrieved or parsed, or if `max_date` could not be
+/// parsed, returns `None`. Otherwise returns `true` if the installed `rustc`
+/// was release on or before `max_date` and `false` otherwise.
+pub fn is_max_date(max_date: &str) -> Option<bool> {
+ match (Date::read(), Date::parse(max_date)) {
+ (Some(rustc_date), Some(max_date)) => Some(rustc_date <= max_date),
+ _ => None
+ }
+}
+
+/// Checks that the running or installed `rustc` was released **exactly** on
+/// some date.
+///
+/// The format of `date` must be YYYY-MM-DD. For instance: `2016-12-20` or
+/// `2017-01-09`.
+///
+/// If the date cannot be retrieved or parsed, or if `date` could not be parsed,
+/// returns `None`. Otherwise returns `true` if the installed `rustc` was
+/// release on `date` and `false` otherwise.
+pub fn is_exact_date(date: &str) -> Option<bool> {
+ match (Date::read(), Date::parse(date)) {
+ (Some(rustc_date), Some(date)) => Some(rustc_date == date),
+ _ => None
+ }
+}
+
+/// Checks that the running or installed `rustc` is **at least** some minimum
+/// version.
+///
+/// The format of `min_version` is a semantic version: `1.3.0`, `1.15.0-beta`,
+/// `1.14.0`, `1.16.0-nightly`, etc.
+///
+/// If the version cannot be retrieved or parsed, or if `min_version` could not
+/// be parsed, returns `None`. Otherwise returns `true` if the installed `rustc`
+/// is at least `min_version` and `false` otherwise.
+pub fn is_min_version(min_version: &str) -> Option<bool> {
+ match (Version::read(), Version::parse(min_version)) {
+ (Some(rustc_ver), Some(min_ver)) => Some(rustc_ver >= min_ver),
+ _ => None
+ }
+}
+
+/// Checks that the running or installed `rustc` is **at most** some maximum
+/// version.
+///
+/// The format of `max_version` is a semantic version: `1.3.0`, `1.15.0-beta`,
+/// `1.14.0`, `1.16.0-nightly`, etc.
+///
+/// If the version cannot be retrieved or parsed, or if `max_version` could not
+/// be parsed, returns `None`. Otherwise returns `true` if the installed `rustc`
+/// is at most `max_version` and `false` otherwise.
+pub fn is_max_version(max_version: &str) -> Option<bool> {
+ match (Version::read(), Version::parse(max_version)) {
+ (Some(rustc_ver), Some(max_ver)) => Some(rustc_ver <= max_ver),
+ _ => None
+ }
+}
+
+/// Checks that the running or installed `rustc` is **exactly** some version.
+///
+/// The format of `version` is a semantic version: `1.3.0`, `1.15.0-beta`,
+/// `1.14.0`, `1.16.0-nightly`, etc.
+///
+/// If the version cannot be retrieved or parsed, or if `version` could not be
+/// parsed, returns `None`. Otherwise returns `true` if the installed `rustc` is
+/// exactly `version` and `false` otherwise.
+pub fn is_exact_version(version: &str) -> Option<bool> {
+ match (Version::read(), Version::parse(version)) {
+ (Some(rustc_ver), Some(version)) => Some(rustc_ver == version),
+ _ => None
+ }
+}
+
+/// Checks whether the running or installed `rustc` supports feature flags.
+///
+/// In other words, if the channel is either "nightly" or "dev".
+///
+/// Note that support for specific `rustc` features can be enabled or disabled
+/// via the `allow-features` compiler flag, which this function _does not_
+/// check. That is, this function _does not_ check whether a _specific_ feature
+/// is supported, but instead whether features are supported at all. To check
+/// for support for a specific feature, use [`supports_feature()`].
+///
+/// If the version could not be determined, returns `None`. Otherwise returns
+/// `true` if the running version supports feature flags and `false` otherwise.
+pub fn is_feature_flaggable() -> Option<bool> {
+ Channel::read().map(|c| c.supports_features())
+}
+
+/// Checks whether the running or installed `rustc` supports `feature`.
+///
+/// Returns _true_ _iff_ [`is_feature_flaggable()`] returns `true` _and_ the
+/// feature is not disabled via exclusion in `allow-features` via `RUSTFLAGS` or
+/// `CARGO_ENCODED_RUSTFLAGS`. If the version could not be determined, returns
+/// `None`.
+///
+/// # Example
+///
+/// ```rust
+/// use version_check as rustc;
+///
+/// if let Some(true) = rustc::supports_feature("doc_cfg") {
+/// println!("cargo:rustc-cfg=has_doc_cfg");
+/// }
+/// ```
+pub fn supports_feature(feature: &str) -> Option<bool> {
+ match is_feature_flaggable() {
+ Some(true) => { /* continue */ }
+ Some(false) => return Some(false),
+ None => return None,
+ }
+
+ let env_flags = env::var_os("CARGO_ENCODED_RUSTFLAGS")
+ .map(|flags| (flags, '\x1f'))
+ .or_else(|| env::var_os("RUSTFLAGS").map(|flags| (flags, ' ')));
+
+ if let Some((flags, delim)) = env_flags {
+ const ALLOW_FEATURES: &'static str = "allow-features=";
+
+ let rustflags = flags.to_string_lossy();
+ let allow_features = rustflags.split(delim)
+ .map(|flag| flag.trim_left_matches("-Z").trim())
+ .filter(|flag| flag.starts_with(ALLOW_FEATURES))
+ .map(|flag| &flag[ALLOW_FEATURES.len()..]);
+
+ if let Some(allow_features) = allow_features.last() {
+ return Some(allow_features.split(',').any(|f| f.trim() == feature));
+ }
+ }
+
+ // If there are no `RUSTFLAGS` or `CARGO_ENCODED_RUSTFLAGS` or they don't
+ // contain an `allow-features` flag, assume compiler allows all features.
+ Some(true)
+}
+
+#[cfg(test)]
+mod tests {
+ use std::{env, fs};
+
+ use super::version_and_date_from_rustc_version;
+ use super::version_and_date_from_rustc_verbose_version;
+
+ macro_rules! check_parse {
+ (@ $f:expr, $s:expr => $v:expr, $d:expr) => ({
+ if let (Some(v), d) = $f(&$s) {
+ let e_d: Option<&str> = $d.into();
+ assert_eq!((v, d), ($v.to_string(), e_d.map(|s| s.into())));
+ } else {
+ panic!("{:?} didn't parse for version testing.", $s);
+ }
+ });
+ ($f:expr, $s:expr => $v:expr, $d:expr) => ({
+ let warn = "warning: invalid logging spec 'warning', ignoring it";
+ let warn2 = "warning: sorry, something went wrong :(sad)";
+ check_parse!(@ $f, $s => $v, $d);
+ check_parse!(@ $f, &format!("{}\n{}", warn, $s) => $v, $d);
+ check_parse!(@ $f, &format!("{}\n{}", warn2, $s) => $v, $d);
+ check_parse!(@ $f, &format!("{}\n{}\n{}", warn, warn2, $s) => $v, $d);
+ check_parse!(@ $f, &format!("{}\n{}\n{}", warn2, warn, $s) => $v, $d);
+ })
+ }
+
+ macro_rules! check_terse_parse {
+ ($($s:expr => $v:expr, $d:expr,)+) => {$(
+ check_parse!(version_and_date_from_rustc_version, $s => $v, $d);
+ )+}
+ }
+
+ macro_rules! check_verbose_parse {
+ ($($s:expr => $v:expr, $d:expr,)+) => {$(
+ check_parse!(version_and_date_from_rustc_verbose_version, $s => $v, $d);
+ )+}
+ }
+
+ #[test]
+ fn test_version_parse() {
+ check_terse_parse! {
+ "rustc 1.18.0" => "1.18.0", None,
+ "rustc 1.8.0" => "1.8.0", None,
+ "rustc 1.20.0-nightly" => "1.20.0-nightly", None,
+ "rustc 1.20" => "1.20", None,
+ "rustc 1.3" => "1.3", None,
+ "rustc 1" => "1", None,
+ "rustc 1.5.1-beta" => "1.5.1-beta", None,
+ "rustc 1.20.0 (2017-07-09)" => "1.20.0", Some("2017-07-09"),
+ "rustc 1.20.0-dev (2017-07-09)" => "1.20.0-dev", Some("2017-07-09"),
+ "rustc 1.20.0-nightly (d84693b93 2017-07-09)" => "1.20.0-nightly", Some("2017-07-09"),
+ "rustc 1.20.0 (d84693b93 2017-07-09)" => "1.20.0", Some("2017-07-09"),
+ "rustc 1.30.0-nightly (3bc2ca7e4 2018-09-20)" => "1.30.0-nightly", Some("2018-09-20"),
+ };
+ }
+
+ #[test]
+ fn test_verbose_version_parse() {
+ check_verbose_parse! {
+ "rustc 1.0.0 (a59de37e9 2015-05-13) (built 2015-05-14)\n\
+ binary: rustc\n\
+ commit-hash: a59de37e99060162a2674e3ff45409ac73595c0e\n\
+ commit-date: 2015-05-13\n\
+ build-date: 2015-05-14\n\
+ host: x86_64-unknown-linux-gnu\n\
+ release: 1.0.0" => "1.0.0", Some("2015-05-13"),
+
+ "rustc 1.0.0 (a59de37e9 2015-05-13) (built 2015-05-14)\n\
+ commit-hash: a59de37e99060162a2674e3ff45409ac73595c0e\n\
+ commit-date: 2015-05-13\n\
+ build-date: 2015-05-14\n\
+ host: x86_64-unknown-linux-gnu\n\
+ release: 1.0.0" => "1.0.0", Some("2015-05-13"),
+
+ "rustc 1.50.0 (cb75ad5db 2021-02-10)\n\
+ binary: rustc\n\
+ commit-hash: cb75ad5db02783e8b0222fee363c5f63f7e2cf5b\n\
+ commit-date: 2021-02-10\n\
+ host: x86_64-unknown-linux-gnu\n\
+ release: 1.50.0" => "1.50.0", Some("2021-02-10"),
+
+ "rustc 1.52.0-nightly (234781afe 2021-03-07)\n\
+ binary: rustc\n\
+ commit-hash: 234781afe33d3f339b002f85f948046d8476cfc9\n\
+ commit-date: 2021-03-07\n\
+ host: x86_64-unknown-linux-gnu\n\
+ release: 1.52.0-nightly\n\
+ LLVM version: 12.0.0" => "1.52.0-nightly", Some("2021-03-07"),
+
+ "rustc 1.41.1\n\
+ binary: rustc\n\
+ commit-hash: unknown\n\
+ commit-date: unknown\n\
+ host: x86_64-unknown-linux-gnu\n\
+ release: 1.41.1\n\
+ LLVM version: 7.0" => "1.41.1", None,
+
+ "rustc 1.49.0\n\
+ binary: rustc\n\
+ commit-hash: unknown\n\
+ commit-date: unknown\n\
+ host: x86_64-unknown-linux-gnu\n\
+ release: 1.49.0" => "1.49.0", None,
+
+ "rustc 1.50.0 (Fedora 1.50.0-1.fc33)\n\
+ binary: rustc\n\
+ commit-hash: unknown\n\
+ commit-date: unknown\n\
+ host: x86_64-unknown-linux-gnu\n\
+ release: 1.50.0" => "1.50.0", None,
+ };
+ }
+
+ fn read_static(verbose: bool, channel: &str, minor: usize) -> String {
+ use std::fs::File;
+ use std::path::Path;
+ use std::io::{BufReader, Read};
+
+ let subdir = if verbose { "verbose" } else { "terse" };
+ let path = Path::new(STATIC_PATH)
+ .join(channel)
+ .join(subdir)
+ .join(format!("rustc-1.{}.0", minor));
+
+ let file = File::open(path).unwrap();
+ let mut buf_reader = BufReader::new(file);
+ let mut contents = String::new();
+ buf_reader.read_to_string(&mut contents).unwrap();
+ contents
+ }
+
+ static STATIC_PATH: &'static str = concat!(env!("CARGO_MANIFEST_DIR"), "/static");
+
+ static DATES: [&'static str; 51] = [
+ "2015-05-13", "2015-06-19", "2015-08-03", "2015-09-15", "2015-10-27",
+ "2015-12-04", "2016-01-19", "2016-02-29", "2016-04-11", "2016-05-18",
+ "2016-07-03", "2016-08-15", "2016-09-23", "2016-11-07", "2016-12-16",
+ "2017-01-19", "2017-03-10", "2017-04-24", "2017-06-06", "2017-07-17",
+ "2017-08-27", "2017-10-09", "2017-11-20", "2018-01-01", "2018-02-12",
+ "2018-03-25", "2018-05-07", "2018-06-19", "2018-07-30", "2018-09-11",
+ "2018-10-24", "2018-12-04", "2019-01-16", "2019-02-28", "2019-04-10",
+ "2019-05-20", "2019-07-03", "2019-08-13", "2019-09-23", "2019-11-04",
+ "2019-12-16", "2020-01-27", "2020-03-09", "2020-04-20", "2020-06-01",
+ "2020-07-13", "2020-08-24", "2020-10-07", "2020-11-16", "2020-12-29",
+ "2021-02-10",
+ ];
+
+ #[test]
+ fn test_stable_compatibility() {
+ if env::var_os("FORCE_STATIC").is_none() && fs::metadata(STATIC_PATH).is_err() {
+ // We exclude `/static` when we package `version_check`, so don't
+ // run if static files aren't present unless we know they should be.
+ return;
+ }
+
+ // Ensure we can parse all output from all Linux stable releases.
+ for v in 0..DATES.len() {
+ let (version, date) = (&format!("1.{}.0", v), Some(DATES[v]));
+ check_terse_parse!(read_static(false, "stable", v) => version, date,);
+ check_verbose_parse!(read_static(true, "stable", v) => version, date,);
+ }
+ }
+
+ #[test]
+ fn test_parse_current() {
+ let (version, channel) = (::Version::read(), ::Channel::read());
+ assert!(version.is_some());
+ assert!(channel.is_some());
+
+ if let Ok(known_channel) = env::var("KNOWN_CHANNEL") {
+ assert_eq!(channel, ::Channel::parse(&known_channel));
+ }
+ }
+}
--- /dev/null
+use std::fmt;
+
+/// Version number: `major.minor.patch`, ignoring release channel.
+#[derive(PartialEq, Eq, Copy, Clone, PartialOrd, Ord)]
+pub struct Version(u64);
+
+impl Version {
+ /// Reads the version of the running compiler. If it cannot be determined
+ /// (see the [top-level documentation](crate)), returns `None`.
+ ///
+ /// # Example
+ ///
+ /// ```rust
+ /// use version_check::Version;
+ ///
+ /// match Version::read() {
+ /// Some(d) => format!("Version is: {}", d),
+ /// None => format!("Failed to read the version.")
+ /// };
+ /// ```
+ pub fn read() -> Option<Version> {
+ ::get_version_and_date()
+ .and_then(|(version, _)| version)
+ .and_then(|version| Version::parse(&version))
+ }
+
+
+ /// Parse a Rust release version (of the form
+ /// `major[.minor[.patch[-channel]]]`), ignoring the release channel, if
+ /// any. Returns `None` if `version` is not a valid Rust version string.
+ ///
+ /// # Example
+ ///
+ /// ```rust
+ /// use version_check::Version;
+ ///
+ /// let version = Version::parse("1.18.0").unwrap();
+ /// assert!(version.exactly("1.18.0"));
+ ///
+ /// let version = Version::parse("1.20.0-nightly").unwrap();
+ /// assert!(version.exactly("1.20.0"));
+ /// assert!(version.exactly("1.20.0-beta"));
+ ///
+ /// let version = Version::parse("1.3").unwrap();
+ /// assert!(version.exactly("1.3.0"));
+ ///
+ /// let version = Version::parse("1").unwrap();
+ /// assert!(version.exactly("1.0.0"));
+ ///
+ /// assert!(Version::parse("one.two.three").is_none());
+ /// assert!(Version::parse("1.65536.2").is_none());
+ /// assert!(Version::parse("1. 2").is_none());
+ /// assert!(Version::parse("").is_none());
+ /// assert!(Version::parse("1.").is_none());
+ /// assert!(Version::parse("1.2.3.4").is_none());
+ /// ```
+ pub fn parse(version: &str) -> Option<Version> {
+ let splits = version.split('-')
+ .nth(0)
+ .unwrap_or("")
+ .split('.')
+ .map(|s| s.parse::<u16>());
+
+ let mut mmp = [0u16; 3];
+ for (i, split) in splits.enumerate() {
+ mmp[i] = match (i, split) {
+ (3, _) | (_, Err(_)) => return None,
+ (_, Ok(v)) => v,
+ };
+ }
+
+ let (maj, min, patch) = (mmp[0], mmp[1], mmp[2]);
+ Some(Version::from_mmp(maj, min, patch))
+ }
+
+ /// Creates a `Version` from `(major, minor, patch)` version components.
+ ///
+ /// # Example
+ ///
+ /// ```rust
+ /// use version_check::Version;
+ ///
+ /// assert!(Version::from_mmp(1, 35, 0).exactly("1.35.0"));
+ /// assert!(Version::from_mmp(1, 33, 0).exactly("1.33.0"));
+ /// assert!(Version::from_mmp(1, 35, 1).exactly("1.35.1"));
+ /// assert!(Version::from_mmp(1, 13, 2).exactly("1.13.2"));
+ /// ```
+ pub fn from_mmp(major: u16, minor: u16, patch: u16) -> Version {
+ Version(((major as u64) << 32) | ((minor as u64) << 16) | patch as u64)
+ }
+
+ /// Returns the `(major, minor, patch)` version components of `self`.
+ ///
+ /// # Example
+ ///
+ /// ```rust
+ /// use version_check::Version;
+ ///
+ /// assert_eq!(Version::parse("1.35.0").unwrap().to_mmp(), (1, 35, 0));
+ /// assert_eq!(Version::parse("1.33.0").unwrap().to_mmp(), (1, 33, 0));
+ /// assert_eq!(Version::parse("1.35.1").unwrap().to_mmp(), (1, 35, 1));
+ /// assert_eq!(Version::parse("1.13.2").unwrap().to_mmp(), (1, 13, 2));
+ /// ```
+ pub fn to_mmp(&self) -> (u16, u16, u16) {
+ let major = self.0 >> 32;
+ let minor = self.0 >> 16;
+ let patch = self.0;
+ (major as u16, minor as u16, patch as u16)
+ }
+
+ /// Returns `true` if `self` is greater than or equal to `version`.
+ ///
+ /// If `version` is greater than `self`, or if `version` is not a valid Rust
+ /// version string, returns `false`.
+ ///
+ /// # Example
+ ///
+ /// ```rust
+ /// use version_check::Version;
+ ///
+ /// let version = Version::parse("1.35.0").unwrap();
+ ///
+ /// assert!(version.at_least("1.33.0"));
+ /// assert!(version.at_least("1.35.0"));
+ /// assert!(version.at_least("1.13.2"));
+ ///
+ /// assert!(!version.at_least("1.35.1"));
+ /// assert!(!version.at_least("1.55.0"));
+ ///
+ /// let version = Version::parse("1.12.5").unwrap();
+ ///
+ /// assert!(version.at_least("1.12.0"));
+ /// assert!(!version.at_least("1.35.0"));
+ /// ```
+ pub fn at_least(&self, version: &str) -> bool {
+ Version::parse(version)
+ .map(|version| self >= &version)
+ .unwrap_or(false)
+ }
+
+ /// Returns `true` if `self` is less than or equal to `version`.
+ ///
+ /// If `version` is less than `self`, or if `version` is not a valid Rust
+ /// version string, returns `false`.
+ ///
+ /// # Example
+ ///
+ /// ```rust
+ /// use version_check::Version;
+ ///
+ /// let version = Version::parse("1.35.0").unwrap();
+ ///
+ /// assert!(version.at_most("1.35.1"));
+ /// assert!(version.at_most("1.55.0"));
+ /// assert!(version.at_most("1.35.0"));
+ ///
+ /// assert!(!version.at_most("1.33.0"));
+ /// assert!(!version.at_most("1.13.2"));
+ /// ```
+ pub fn at_most(&self, version: &str) -> bool {
+ Version::parse(version)
+ .map(|version| self <= &version)
+ .unwrap_or(false)
+ }
+
+ /// Returns `true` if `self` is exactly equal to `version`.
+ ///
+ /// If `version` is not equal to `self`, or if `version` is not a valid Rust
+ /// version string, returns `false`.
+ ///
+ /// # Example
+ ///
+ /// ```rust
+ /// use version_check::Version;
+ ///
+ /// let version = Version::parse("1.35.0").unwrap();
+ ///
+ /// assert!(version.exactly("1.35.0"));
+ ///
+ /// assert!(!version.exactly("1.33.0"));
+ /// assert!(!version.exactly("1.35.1"));
+ /// assert!(!version.exactly("1.13.2"));
+ /// ```
+ pub fn exactly(&self, version: &str) -> bool {
+ Version::parse(version)
+ .map(|version| self == &version)
+ .unwrap_or(false)
+ }
+}
+
+impl fmt::Display for Version {
+ fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+ let (major, minor, patch) = self.to_mmp();
+ write!(f, "{}.{}.{}", major, minor, patch)
+ }
+}
+
+impl fmt::Debug for Version {
+ fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+ // We don't use `debug_*` because it's not available in `1.0.0`.
+ write!(f, "Version({:?}, {:?})", self.0, self.to_mmp())
+ }
+}
+
+#[cfg(test)]
+mod tests {
+ use super::Version;
+
+ macro_rules! assert_to_mmp {
+ // We don't use `.into::<Option<_>>` because it's not available in 1.0.
+ // We don't use the message part of `assert!` for the same reason.
+ ($s:expr, None) => (
+ assert_eq!(Version::parse($s), None);
+ );
+ ($s:expr, $mmp:expr) => (
+ assert_eq!(Version::parse($s).map(|v| v.to_mmp()), Some($mmp));
+ )
+ }
+
+ macro_rules! assert_from_mmp {
+ (($x:expr, $y:expr, $z:expr) => $s:expr) => {
+ assert_eq!(Some(Version::from_mmp($x, $y, $z)), Version::parse($s));
+ };
+ }
+
+ #[test]
+ fn test_str_to_mmp() {
+ assert_to_mmp!("1", (1, 0, 0));
+ assert_to_mmp!("1.2", (1, 2, 0));
+ assert_to_mmp!("1.18.0", (1, 18, 0));
+ assert_to_mmp!("3.19.0", (3, 19, 0));
+ assert_to_mmp!("1.19.0-nightly", (1, 19, 0));
+ assert_to_mmp!("1.12.2349", (1, 12, 2349));
+ assert_to_mmp!("0.12", (0, 12, 0));
+ assert_to_mmp!("1.12.5", (1, 12, 5));
+ assert_to_mmp!("1.12", (1, 12, 0));
+ assert_to_mmp!("1", (1, 0, 0));
+ assert_to_mmp!("1.4.4-nightly (d84693b93 2017-07-09))", (1, 4, 4));
+ assert_to_mmp!("1.58879.4478-dev", (1, 58879, 4478));
+ assert_to_mmp!("1.58879.4478-dev (d84693b93 2017-07-09))", (1, 58879, 4478));
+ }
+
+ #[test]
+ fn test_malformed() {
+ assert_to_mmp!("1.65536.2", None);
+ assert_to_mmp!("-1.2.3", None);
+ assert_to_mmp!("1. 2", None);
+ assert_to_mmp!("", None);
+ assert_to_mmp!(" ", None);
+ assert_to_mmp!(".", None);
+ assert_to_mmp!("one", None);
+ assert_to_mmp!("1.", None);
+ assert_to_mmp!("1.2.3.4.5.6", None);
+ }
+
+ #[test]
+ fn test_from_mmp() {
+ assert_from_mmp!((1, 18, 0) => "1.18.0");
+ assert_from_mmp!((3, 19, 0) => "3.19.0");
+ assert_from_mmp!((1, 19, 0) => "1.19.0");
+ assert_from_mmp!((1, 12, 2349) => "1.12.2349");
+ assert_from_mmp!((0, 12, 0) => "0.12");
+ assert_from_mmp!((1, 12, 5) => "1.12.5");
+ assert_from_mmp!((1, 12, 0) => "1.12");
+ assert_from_mmp!((1, 0, 0) => "1");
+ assert_from_mmp!((1, 4, 4) => "1.4.4");
+ assert_from_mmp!((1, 58879, 4478) => "1.58879.4478");
+ }
+
+ #[test]
+ fn test_comparisons() {
+ let version = Version::parse("1.18.0").unwrap();
+ assert!(version.exactly("1.18.0"));
+ assert!(version.at_least("1.12.0"));
+ assert!(version.at_least("1.12"));
+ assert!(version.at_least("1"));
+ assert!(version.at_most("1.18.1"));
+ assert!(!version.exactly("1.19.0"));
+ assert!(!version.exactly("1.18.1"));
+
+ let version = Version::parse("1.20.0-nightly").unwrap();
+ assert!(version.exactly("1.20.0-beta"));
+ assert!(version.exactly("1.20.0-nightly"));
+ assert!(version.exactly("1.20.0"));
+ assert!(!version.exactly("1.19"));
+
+ let version = Version::parse("1.3").unwrap();
+ assert!(version.exactly("1.3.0"));
+ assert!(version.exactly("1.3.0-stable"));
+ assert!(version.exactly("1.3"));
+ assert!(!version.exactly("1.5.0-stable"));
+
+ let version = Version::parse("1").unwrap();
+ assert!(version.exactly("1.0.0"));
+ assert!(version.exactly("1.0"));
+ assert!(version.exactly("1"));
+
+ assert!(Version::parse("one.two.three").is_none());
+ }
+
+ macro_rules! reflexive_display {
+ ($s:expr) => (
+ assert_eq!(Version::parse($s).unwrap().to_string(), $s);
+ )
+ }
+
+ #[test]
+ fn display() {
+ reflexive_display!("1.0.0");
+ reflexive_display!("1.2.3");
+ reflexive_display!("1.12.1438");
+ reflexive_display!("1.44.0");
+ reflexive_display!("2.44.0");
+ reflexive_display!("23459.28923.3483");
+ }
+}
projects / platform / upstream / rust-version_check.git / commitdiff