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<title>一个 I/O 项目 - Rust 程序设计语言 简体中文版</title>
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<ul class="chapter"><li><a href="ch01-00-introduction.html"><strong>1.</strong> 介绍</a></li><li><ul class="section"><li><a href="ch01-01-installation.html"><strong>1.1.</strong> 安装</a></li><li><a href="ch01-02-hello-world.html"><strong>1.2.</strong> Hello, World!</a></li></ul></li><li><a href="ch02-00-guessing-game-tutorial.html"><strong>2.</strong> 猜猜看教程</a></li><li><a href="ch03-00-common-programming-concepts.html"><strong>3.</strong> 通用编程概念</a></li><li><ul class="section"><li><a href="ch03-01-variables-and-mutability.html"><strong>3.1.</strong> 变量和可变性</a></li><li><a href="ch03-02-data-types.html"><strong>3.2.</strong> 数据类型</a></li><li><a href="ch03-03-how-functions-work.html"><strong>3.3.</strong> 函数如何工作</a></li><li><a href="ch03-04-comments.html"><strong>3.4.</strong> 注释</a></li><li><a href="ch03-05-control-flow.html"><strong>3.5.</strong> 控制流</a></li></ul></li><li><a href="ch04-00-understanding-ownership.html"><strong>4.</strong> 认识所有权</a></li><li><ul class="section"><li><a href="ch04-01-what-is-ownership.html"><strong>4.1.</strong> 什么是所有权</a></li><li><a href="ch04-02-references-and-borrowing.html"><strong>4.2.</strong> 引用 & 借用</a></li><li><a href="ch04-03-slices.html"><strong>4.3.</strong> Slices</a></li></ul></li><li><a href="ch05-00-structs.html"><strong>5.</strong> 结构体</a></li><li><ul class="section"><li><a href="ch05-01-method-syntax.html"><strong>5.1.</strong> 方法语法</a></li></ul></li><li><a href="ch06-00-enums.html"><strong>6.</strong> 枚举和模式匹配</a></li><li><ul class="section"><li><a href="ch06-01-defining-an-enum.html"><strong>6.1.</strong> 定义枚举</a></li><li><a href="ch06-02-match.html"><strong>6.2.</strong> <code>match</code>控制流运算符</a></li><li><a href="ch06-03-if-let.html"><strong>6.3.</strong> <code>if let</code>简单控制流</a></li></ul></li><li><a href="ch07-00-modules.html"><strong>7.</strong> 模块</a></li><li><ul class="section"><li><a href="ch07-01-mod-and-the-filesystem.html"><strong>7.1.</strong> <code>mod</code>和文件系统</a></li><li><a href="ch07-02-controlling-visibility-with-pub.html"><strong>7.2.</strong> 使用<code>pub</code>控制可见性</a></li><li><a href="ch07-03-importing-names-with-use.html"><strong>7.3.</strong> 使用<code>use</code>导入命名</a></li></ul></li><li><a href="ch08-00-common-collections.html"><strong>8.</strong> 通用集合类型</a></li><li><ul class="section"><li><a href="ch08-01-vectors.html"><strong>8.1.</strong> vector</a></li><li><a href="ch08-02-strings.html"><strong>8.2.</strong> 字符串</a></li><li><a href="ch08-03-hash-maps.html"><strong>8.3.</strong> 哈希 map</a></li></ul></li><li><a href="ch09-00-error-handling.html"><strong>9.</strong> 错误处理</a></li><li><ul class="section"><li><a href="ch09-01-unrecoverable-errors-with-panic.html"><strong>9.1.</strong> <code>panic!</code>与不可恢复的错误</a></li><li><a href="ch09-02-recoverable-errors-with-result.html"><strong>9.2.</strong> <code>Result</code>与可恢复的错误</a></li><li><a href="ch09-03-to-panic-or-not-to-panic.html"><strong>9.3.</strong> <code>panic!</code>还是不<code>panic!</code></a></li></ul></li><li><a href="ch10-00-generics.html"><strong>10.</strong> 泛型、trait 和生命周期</a></li><li><ul class="section"><li><a href="ch10-01-syntax.html"><strong>10.1.</strong> 泛型数据类型</a></li><li><a href="ch10-02-traits.html"><strong>10.2.</strong> trait：定义共享的行为</a></li><li><a href="ch10-03-lifetime-syntax.html"><strong>10.3.</strong> 生命周期与引用有效性</a></li></ul></li><li><a href="ch11-00-testing.html"><strong>11.</strong> 测试</a></li><li><ul class="section"><li><a href="ch11-01-writing-tests.html"><strong>11.1.</strong> 编写测试</a></li><li><a href="ch11-02-running-tests.html"><strong>11.2.</strong> 运行测试</a></li><li><a href="ch11-03-test-organization.html"><strong>11.3.</strong> 测试的组织结构</a></li></ul></li><li><a href="ch12-00-an-io-project.h
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<h1 class="menu-title">Rust 程序设计语言 简体中文版</h1>
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<div id="content" class="content">
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<a class="header" href="#一个-io-项目" name="一个-io-项目"><h1>一个 I/O 项目</h1></a>
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<blockquote>
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<p><a href="https://github.com/rust-lang/book/blob/master/src/ch12-00-an-io-project.md">ch12-00-an-io-project.md</a>
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<br>
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commit efd59dd0fe8e3658563fb5fd289af9d862e07a03</p>
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</blockquote>
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<p>之前几个章节我们学习了很多知识。让我们一起运用这些新知识来构建一个项目。在这个过程中，我们还将学习到更多 Rust 标准库的内容。</p>
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<p>那么我们应该写点什么呢？这得是一个利用 Rust 优势的项目。Rust 的一个强大的用途是命令行工具：Rust 的运行速度、安全性、“单二进制文件”输出和跨平台支持使得它称为这类工作的绝佳选择。所以我们将创建一个我们自己的经典命令行工具：<code>grep</code>。<code>grep</code>有着极为简单的应用场景，它完成如下工作：</p>
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<ol>
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<li>它获取一个文件和一个字符串作为参数。</li>
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<li>读取文件</li>
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<li>寻找文件中包含字符串参数的行</li>
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<li>打印出这些行</li>
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</ol>
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<p>另外，我们还将添加一个额外的功能：一个环境变量允许我们大小写不敏感的搜索字符串参数。</p>
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<p>还有另一个很好的理由使用<code>grep</code>作为示例项目：Rust 社区的成员，Andrew Gallant，已经使用 Rust 创建了一个功能非常完整的<code>grep</code>版本。它叫做<code>ripgrep</code>，并且它非常非常快。这样虽然我们的<code>grep</code>将会非常简单，你也会掌握阅读现实生活中项目的基础知识。</p>
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<p>这个项目将会结合之前所学的一些内容：</p>
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<ul>
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<li>代码组织（使用第七章学习的模块）</li>
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<li>vector 和字符串（第八章，集合）</li>
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<li>错误处理（第九章）</li>
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<li>合理的使用 trait 和生命周期（第十章）</li>
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<li>测试（第十一章）</li>
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</ul>
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<p>另外，我还会简要的讲到闭包、迭代器和 trait 对象，他们分别会在第XX、YY和ZZ章详细介绍。</p>
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<p>让我们一如既往的使用<code>cargo new</code>创建一个新项目：</p>
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<pre><code class="language-text">$ cargo new --bin greprs
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Created binary (application) `greprs` project
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$ cd greprs
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</code></pre>
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<p>我们版本的<code>grep</code>的叫做“greprs”，这样就不会迷惑用户让他们以为这就是可能已经在系统上安装了功能更完整的<code>grep</code>。</p>
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