https://plumephp.com/tags/flagset/Recent content in FlagSet on PlumePHPHugozh-CNMon, 28 Aug 2023 20:22:00 +0800https://plumephp.com/go-cli-flagset-subcommands-2023/Mon, 28 Aug 2023 20:22:00 +0800https://plumephp.com/go-cli-flagset-subcommands-2023/<h2 id="一个命令变多后main-很容易乱">一个命令变多后，main 很容易乱</h2> <p>Go 很适合写命令行工具。最开始你可能只有一个参数：</p> <div class="highlight"><pre tabindex="0" class="chroma"><code class="language-sh" data-lang="sh"><span class="line"><span class="cl">todo -file tasks.json </span></span></code></pre></div><p>后来需求变成：</p> <div class="highlight"><pre tabindex="0" class="chroma"><code class="language-sh" data-lang="sh"><span class="line"><span class="cl">todo add -title <span class="s2">&#34;学习 Go&#34;</span> </span></span><span class="line"><span class="cl">todo list </span></span><span class="line"><span class="cl">todo <span class="k">done</span> -id <span class="m">1</span> </span></span></code></pre></div><p>这时如果还把所有参数都塞进全局 <code>flag</code>，<code>main.go</code> 会很快变乱。标准库 <code>flag.FlagSet</code> 可以为每个子命令单独解析参数。你不一定要马上引入 Cobra 这类库，小工具用标准库就能组织得很清楚。</p>