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<main>
<h1 id="版本号"><a class="header" href="#版本号">版本号</a></h1>
<h3 id="解析并增加版本号"><a class="header" href="#解析并增加版本号">解析并增加版本号</a></h3>
<p>下面例子使用 <a href="https://docs.rs/semver/*/semver/struct.Version.html#method.parse">Version::parse</a> 将一个字符串转换成 <a href="https://docs.rs/semver/*/semver/struct.Version.html">semver::Version</a> 版本号，然后将它的 patch, minor, major 版本号都增加 1。</p>
<p>注意，为了符合<a href="http://semver.org">语义化版本的说明</a>，增加 <code>minor</code> 版本时，<code>patch</code> 版本会被重设为 <code>0</code>，当增加 <code>major</code> 版本时，<code>minor</code> 和 <code>patch</code> 都将被重设为 <code>0</code>。</p>
<pre><pre class="playground"><code class="language-rust editable edition2021">use semver::{Version, SemVerError};
fn main() -&gt; Result&lt;(), SemVerError&gt; {
let mut parsed_version = Version::parse(&quot;0.2.6&quot;)?;
assert_eq!(
parsed_version,
Version {
major: 0,
minor: 2,
patch: 6,
pre: vec![],
build: vec![],
}
);
parsed_version.increment_patch();
assert_eq!(parsed_version.to_string(), &quot;0.2.7&quot;);
println!(&quot;New patch release: v{}&quot;, parsed_version);
parsed_version.increment_minor();
assert_eq!(parsed_version.to_string(), &quot;0.3.0&quot;);
println!(&quot;New minor release: v{}&quot;, parsed_version);
parsed_version.increment_major();
assert_eq!(parsed_version.to_string(), &quot;1.0.0&quot;);
println!(&quot;New major release: v{}&quot;, parsed_version);
Ok(())
}
</code></pre></pre>
<h3 id="解析一个复杂的版本号字符串"><a class="header" href="#解析一个复杂的版本号字符串">解析一个复杂的版本号字符串</a></h3>
<p>这里的版本号字符串还将包含 <code>SemVer</code> 中定义的预发布和构建元信息。</p>
<p>值得注意的是，为了符合 <code>SemVer</code> 的规则，构建元信息虽然会被解析，但是在做版本号比较时，该信息会被忽略。换而言之，即使两个版本号的构建字符串不同，它们的版本号依然可能相同。</p>
<pre><pre class="playground"><code class="language-rust editable edition2021">use semver::{Identifier, Version, SemVerError};
fn main() -&gt; Result&lt;(), SemVerError&gt; {
let version_str = &quot;1.0.49-125+g72ee7853&quot;;
let parsed_version = Version::parse(version_str)?;
assert_eq!(
parsed_version,
Version {
major: 1,
minor: 0,
patch: 49,
pre: vec![Identifier::Numeric(125)],
build: vec![],
}
);
assert_eq!(
parsed_version.build,
vec![Identifier::AlphaNumeric(String::from(&quot;g72ee7853&quot;))]
);
let serialized_version = parsed_version.to_string();
assert_eq!(&amp;serialized_version, version_str);
Ok(())
}
</code></pre></pre>
<h3 id="检查给定的版本号是否是预发布"><a class="header" href="#检查给定的版本号是否是预发布">检查给定的版本号是否是预发布</a></h3>
<p>下面例子给出两个版本号，然后通过 <a href="https://docs.rs/semver/1.0.7/semver/struct.Version.html#method.is_prerelease">is_prerelease</a> 判断哪个是预发布的版本号。</p>
<pre><pre class="playground"><code class="language-rust editable edition2021">use semver::{Version, SemVerError};
fn main() -&gt; Result&lt;(), SemVerError&gt; {
let version_1 = Version::parse(&quot;1.0.0-alpha&quot;)?;
let version_2 = Version::parse(&quot;1.0.0&quot;)?;
assert!(version_1.is_prerelease());
assert!(!version_2.is_prerelease());
Ok(())
}
</code></pre></pre>
<h3 id="找出给定范围内的最新版本"><a class="header" href="#找出给定范围内的最新版本">找出给定范围内的最新版本</a></h3>
<p>下面例子给出了一个版本号列表，我们需要找到其中最新的版本。</p>
<pre><pre class="playground"><code class="language-rust editable edition2021"><span class="boring">use error_chain::error_chain;
</span>
use semver::{Version, VersionReq};
<span class="boring">error_chain! {
</span><span class="boring"> foreign_links {
</span><span class="boring"> SemVer(semver::SemVerError);
</span><span class="boring"> SemVerReq(semver::ReqParseError);
</span><span class="boring"> }
</span>3}
fn find_max_matching_version&lt;'a, I&gt;(version_req_str: &amp;str, iterable: I) -&gt; Result&lt;Option&lt;Version&gt;&gt;
where
I: IntoIterator&lt;Item = &amp;'a str&gt;,
{
let vreq = VersionReq::parse(version_req_str)?;
Ok(
iterable
.into_iter()
.filter_map(|s| Version::parse(s).ok())
.filter(|s| vreq.matches(s))
.max(),
)
}
fn main() -&gt; Result&lt;()&gt; {
assert_eq!(
find_max_matching_version(&quot;&lt;= 1.0.0&quot;, vec![&quot;0.9.0&quot;, &quot;1.0.0&quot;, &quot;1.0.1&quot;])?,
Some(Version::parse(&quot;1.0.0&quot;)?)
);
assert_eq!(
find_max_matching_version(
&quot;&gt;1.2.3-alpha.3&quot;,
vec![
&quot;1.2.3-alpha.3&quot;,
&quot;1.2.3-alpha.4&quot;,
&quot;1.2.3-alpha.10&quot;,
&quot;1.2.3-beta.4&quot;,
&quot;3.4.5-alpha.9&quot;,
]
)?,
Some(Version::parse(&quot;1.2.3-beta.4&quot;)?)
);
Ok(())
}
</code></pre></pre>
<h3 id="检查外部命令的版本号兼容性"><a class="header" href="#检查外部命令的版本号兼容性">检查外部命令的版本号兼容性</a></h3>
<p>下面将通过 <a href="https://doc.rust-lang.org/std/process/struct.Command.html">Command</a> 来执行系统命令 <code>git --version</code>，并对该系统命令返回的 <code>git</code> 版本号进行解析。</p>
<pre><pre class="playground"><code class="language-rust editable edition2021"><span class="boring">use error_chain::error_chain;
</span>
use std::process::Command;
use semver::{Version, VersionReq};
<span class="boring">error_chain! {
</span><span class="boring"> foreign_links {
</span><span class="boring"> Io(std::io::Error);
</span><span class="boring"> Utf8(std::string::FromUtf8Error);
</span><span class="boring"> SemVer(semver::SemVerError);
</span><span class="boring"> SemVerReq(semver::ReqParseError);
</span><span class="boring"> }
</span><span class="boring">}
</span>
fn main() -&gt; Result&lt;()&gt; {
let version_constraint = &quot;&gt; 1.12.0&quot;;
let version_test = VersionReq::parse(version_constraint)?;
let output = Command::new(&quot;git&quot;).arg(&quot;--version&quot;).output()?;
if !output.status.success() {
error_chain::bail!(&quot;Command executed with failing error code&quot;);
}
let stdout = String::from_utf8(output.stdout)?;
let version = stdout.split(&quot; &quot;).last().ok_or_else(|| {
&quot;Invalid command output&quot;
})?;
let parsed_version = Version::parse(version)?;
if !version_test.matches(&amp;parsed_version) {
error_chain::bail!(&quot;Command version lower than minimum supported version (found {}, need {})&quot;,
parsed_version, version_constraint);
}
Ok(())
}
</code></pre></pre>
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