{"id":10008252,"date":"2023-09-08T11:30:09","date_gmt":"2023-09-08T03:30:09","guid":{"rendered":"https:\/\/blog.itmax.cn\/?p=10008252"},"modified":"2023-09-08T11:30:09","modified_gmt":"2023-09-08T03:30:09","slug":"%e6%96%87%e7%9b%98rust-%e5%ad%90%e5%91%bd%e4%bb%a4%e6%8f%90%e7%a4%ba%ef%bc%8c%e6%8f%90%e9%ab%98%e7%94%a8%e6%88%b7%e4%bd%93%e9%aa%8c-%e4%ba%ac%e4%b8%9c%e4%ba%91%e6%8a%80%e6%9c%af","status":"publish","type":"post","link":"https:\/\/itmax.cn\/?p=10008252","title":{"rendered":"\u6587\u76d8Rust\u2014\u2014\u5b50\u547d\u4ee4\u63d0\u793a\uff0c\u63d0\u9ad8\u7528\u6237\u4f53\u9a8c | \u4eac\u4e1c\u4e91\u6280\u672f\u56e2\u961f"},"content":{"rendered":"<p>\u4e0a\u6b21\u6211\u4eec\u804a\u5230 CLI \u7684\u9886\u57df\u4ea4\u4e92\u6a21\u5f0f\u3002\u5728\u9886\u57df\u4ea4\u4e92\u6a21\u5f0f\u4e2d\uff0c\u53ef\u80fd\u5b58\u5728\u591a\u5c42\u6b21\u7684\u5b50\u547d\u4ee4\u3002\u5728\u4f7f\u7528\u8fc7\u7a0b\u4e2d\u5982\u679c\u5168\u8bc4\u8bb0\u5fc6\u7684\u8bdd\uff0c\u547d\u4ee4\u5c11\u8fd8\u597d\uff0c\u591a\u4e86\u771f\u5fc3\u8bb0\u4e0d\u4f4f\u3002\u9891\u7e41 &#8211;help \u4e5f\u662f\u4e2a\u5f88\u9ebb\u70e6\u7684\u4e8b\u60c5\u3002\u5982\u679c\u6bcf\u6b21\u6309 &#8216;tab&#8217; \u952e\u5c31\u53ef\u4ee5\u63d0\u793a\u6216\u8865\u9f50\u547d\u4ee4\u662f\u4e0d\u662f\u5f88\u65b9\u4fbf\u5462\u3002\u8fd9\u4e00\u8282\u6211\u4eec\u5c31\u6765\u8bf4\u8bf4 &#8216;autocommplete&#8217; \u5982\u4f55\u5b9e\u73b0\u3002\u6211\u4eec\u8fd8\u662f\u4ee5interactcli-rs\u4e2d\u7684\u5b9e\u73b0\u6765\u89e3\u8bf4\u5b9e\u73b0\u8fc7\u7a0b<\/p>\n<p><strong>\u5b9e\u73b0\u8fc7\u7a0b<\/strong><\/p>\n<p>\u5176\u5b9e\uff0crustyline \u5df2\u7ecf\u4e3a\u6211\u4eec\u63d0\u4f9b\u4e86\u57fa\u672c\u7684helper\u529f\u80fd\u6846\u67b6,\u5176\u4e2d\u5305\u62ec\u4e86completer\u3002\u6211\u4eec\u6765\u770b\u4ee3\u7801\uff0c\u6587\u4ef6\u4f4d\u7f6esrc\/interact\/cli.rs<\/p>\n<pre><code>#[derive(Helper)]\nstruct\u00a0MyHelper\u00a0{\n\u00a0\u00a0\u00a0\u00a0completer:\u00a0CommandCompleter,\n\u00a0\u00a0\u00a0\u00a0highlighter:\u00a0MatchingBracketHighlighter,\n\u00a0\u00a0\u00a0\u00a0validator:\u00a0MatchingBracketValidator,\n\u00a0\u00a0\u00a0\u00a0hinter:\u00a0HistoryHinter,\n\u00a0\u00a0\u00a0\u00a0colored_prompt:\u00a0String,\n}\n\npub\u00a0fn\u00a0run()\u00a0{\n\u00a0\u00a0\u00a0\u00a0let\u00a0config\u00a0=\u00a0Config::builder()\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0.history_ignore_space(true)\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0.completion_type(CompletionType::List)\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0.output_stream(OutputStreamType::Stdout)\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0.build();\n\n\u00a0\u00a0\u00a0\u00a0let\u00a0h\u00a0=\u00a0MyHelper\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0completer:\u00a0get_command_completer(),\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0highlighter:\u00a0MatchingBracketHighlighter::new(),\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0hinter:\u00a0HistoryHinter\u00a0{},\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0colored_prompt:\u00a0&quot;&quot;.to_owned(),\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0validator:\u00a0MatchingBracketValidator::new(),\n\u00a0\u00a0\u00a0\u00a0};\n\n\u00a0\u00a0\u00a0\u00a0let\u00a0mut\u00a0rl\u00a0=\u00a0Editor::with_config(config);\n\u00a0\u00a0\u00a0\u00a0\/\/\u00a0let\u00a0mut\u00a0rl\u00a0=\u00a0Editor::&lt;()&gt;::new();\n\u00a0\u00a0\u00a0\u00a0rl.set_helper(Some(h));\n\n\u00a0\u00a0\u00a0\u00a0......\n\n}\n\n\n<\/code><\/pre>\n<p>\u9996\u5148\u5b9a\u4e49 MyHelper \u7ed3\u6784\u4f53\uff0c \u9700\u8981\u5b9e\u73b0 Completer + Hinter + Highlighter + Validator trait\u3002\u7136\u540e\u901a\u8fc7rustyline\u7684set_helper\u51fd\u6570\u52a0\u8f7d\u6211\u4eec\u5b9a\u4e49\u597d\u7684helper\u3002\u5728MyHelper \u7ed3\u6784\u4f53\u4e2d\uff0c\u9700\u8981\u6211\u4eec\u81ea\u5df1\u6765\u5b9e\u73b0completer\u7684\u903b\u8f91\u3002<\/p>\n<p><strong>Sub command autocompleter\u5b9e\u73b0\u8be6\u89e3<\/strong><\/p>\n<ul>\n<li>SubCmd \u7ed3\u6784\u4f53<\/li>\n<\/ul>\n<pre><code>#[derive(Debug,\u00a0Clone)]\npub\u00a0struct\u00a0SubCmd\u00a0{\n\u00a0\u00a0\u00a0\u00a0pub\u00a0level:\u00a0usize,\n\u00a0\u00a0\u00a0\u00a0pub\u00a0command_name:\u00a0String,\n\u00a0\u00a0\u00a0\u00a0pub\u00a0subcommands:\u00a0Vec&lt;String&gt;,\n}\n\n\n<\/code><\/pre>\n<p>SubCmd \u7ed3\u6784\u4f53\u5305\u542b\uff1a\u547d\u4ee4\u7ea7\u522b\uff0c\u547d\u4ee4\u540d\u79f0\uff0c\u4ee5\u53ca\u8be5\u547d\u4ee4\u5305\u542b\u7684\u5b50\u547d\u4ee4\u4fe1\u606f\uff0c\u4ee5\u4fbf\u5728\u5b9e\u73b0\u5b9e\u73b0 autocomplete \u65f6\u5b9a\u4f4d\u547d\u4ee4\u548c\u5b50\u547d\u4ee4\u7684\u8303\u56f4<\/p>\n<ul>\n<li>\u5728\u7a0b\u5e8f\u542f\u52a8\u65f6\u904d\u5386\u6240\u6709\u7684command\uff0csrc\/cmd\/rootcmd.rs \u4e2d\u7684all_subcommand\u51fd\u6570\u8d1f\u8d23\u6536\u96c6\u6240\u6709\u547d\u4ee4\u5e76\u8f6c\u6362\u4e3aVec&lt;SubCmd&gt;<\/li>\n<\/ul>\n<pre><code>pub\u00a0fn\u00a0all_subcommand(app:\u00a0&amp;clap_Command,\u00a0beginlevel:\u00a0usize,\u00a0input:\u00a0&amp;mut\u00a0Vec&lt;SubCmd&gt;)\u00a0{\n\u00a0\u00a0let\u00a0nextlevel\u00a0=\u00a0beginlevel\u00a0+\u00a01;\n\u00a0\u00a0let\u00a0mut\u00a0subcmds\u00a0=\u00a0vec![];\n\u00a0\u00a0for\u00a0iterm\u00a0in\u00a0app.get_subcommands()\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0subcmds.push(iterm.get_name().to_string());\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0if\u00a0iterm.has_subcommands()\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0all_subcommand(iterm,\u00a0nextlevel,\u00a0input);\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\u00a0else\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0if\u00a0beginlevel\u00a0==\u00a00\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0all_subcommand(iterm,\u00a0nextlevel,\u00a0input);\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\u00a0\u00a0}\n\u00a0\u00a0let\u00a0subcommand\u00a0=\u00a0SubCmd\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0level:\u00a0beginlevel,\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0command_name:\u00a0app.get_name().to_string(),\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0subcommands:\u00a0subcmds,\n\u00a0\u00a0};\n\u00a0\u00a0input.push(subcommand);\n}\n\n\n<\/code><\/pre>\n<ul>\n<li>CommandCompleter \u5b50\u547d\u4ee4\u81ea\u52a8\u8865\u5145\u529f\u80fd\u7684\u6838\u5fc3\u90e8\u5206<\/li>\n<\/ul>\n<pre><code>#[derive(Debug,\u00a0Clone)]\npub\u00a0struct\u00a0CommandCompleter\u00a0{\n\u00a0\u00a0\u00a0\u00a0subcommands:\u00a0Vec&lt;SubCmd&gt;,\n}\n\nimpl\u00a0CommandCompleter\u00a0{\n\u00a0\u00a0\u00a0\u00a0pub\u00a0fn\u00a0new(subcmds:\u00a0Vec&lt;SubCmd&gt;)\u00a0-&gt;\u00a0Self\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Self\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0subcommands:\u00a0subcmds,\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\u00a0\u00a0\u00a0\u00a0}\n\n\u00a0\u00a0\u00a0\u00a0\/\/\u83b7\u53d6level\u4e0b\u6240\u6709\u53ef\u80fd\u7684\u5b50\u547d\u4ee4\n\u00a0\u00a0\u00a0\u00a0pub\u00a0fn\u00a0level_possible_cmd(&amp;self,\u00a0level:\u00a0usize)\u00a0-&gt;\u00a0\u00a0\u00a0Vec&lt;String&gt;\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0let\u00a0mut\u00a0subcmds\u00a0=\u00a0vec![];\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0let\u00a0cmds\u00a0=\u00a0self.subcommands.clone();\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0for\u00a0iterm\u00a0in\u00a0cmds\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0if\u00a0iterm.level\u00a0==\u00a0level\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0subcmds.push(iterm.command_name.clone());\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return\u00a0subcmds;\n\u00a0\u00a0\u00a0\u00a0}\n\u00a0\u00a0\u00a0\u00a0\/\/\u83b7\u53d6level\u4e0b\u67d0\u5b57\u7b26\u4e32\u5f00\u5934\u7684\u5b50\u547d\u4ee4\n\u00a0\u00a0\u00a0\u00a0pub\u00a0fn\u00a0level_prefix_possible_cmd(&amp;self,\u00a0level:\u00a0usize,\u00a0\u00a0\u00a0prefix:\u00a0&amp;str)\u00a0-&gt;\u00a0Vec&lt;String&gt;\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0let\u00a0mut\u00a0subcmds\u00a0=\u00a0vec![];\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0let\u00a0cmds\u00a0=\u00a0self.subcommands.clone();\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0for\u00a0iterm\u00a0in\u00a0cmds\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0if\u00a0iterm.level\u00a0==\u00a0level\u00a0&amp;&amp;\u00a0iterm.command_name.\u00a0\u00a0starts_with(prefix)\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0subcmds.push(iterm.command_name);\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return\u00a0subcmds;\n\u00a0\u00a0\u00a0\u00a0}\n\n\u00a0\u00a0\u00a0\u00a0\/\/\u83b7\u53d6\u67d0level\u00a0\u4e0b\u67d0subcommand\u7684\u6240\u6709\u5b50\u547d\u4ee4\n\u00a0\u00a0\u00a0\u00a0pub\u00a0fn\u00a0level_cmd_possible_sub_cmd(&amp;self,\u00a0level:\u00a0\u00a0\u00a0usize,\u00a0cmd:\u00a0String)\u00a0-&gt;\u00a0Vec&lt;String&gt;\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0let\u00a0mut\u00a0subcmds\u00a0=\u00a0vec![];\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0let\u00a0cmds\u00a0=\u00a0self.subcommands.clone();\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0for\u00a0iterm\u00a0in\u00a0cmds\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0if\u00a0iterm.level\u00a0==\u00a0level\u00a0&amp;&amp;\u00a0iterm.command_name\u00a0\u00a0\u00a0==\u00a0cmd\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0subcmds\u00a0=\u00a0iterm.subcommands.clone();\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return\u00a0subcmds;\n\u00a0\u00a0\u00a0\u00a0}\n\n\u00a0\u00a0\u00a0\u00a0\/\/\u83b7\u53d6\u67d0level\u00a0\u4e0b\u67d0subcommand\u7684\u6240\u6709prefix\u5b50\u547d\u4ee4\n\u00a0\u00a0\u00a0\u00a0pub\u00a0fn\u00a0level_cmd_possible_prefix_sub_cmd(\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0&amp;self,\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0level:\u00a0usize,\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0cmd:\u00a0String,\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0prefix:\u00a0&amp;str,\n\u00a0\u00a0\u00a0\u00a0)\u00a0-&gt;\u00a0Vec&lt;String&gt;\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0let\u00a0mut\u00a0subcmds\u00a0=\u00a0vec![];\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0let\u00a0cmds\u00a0=\u00a0self.subcommands.clone();\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0for\u00a0iterm\u00a0in\u00a0cmds\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0if\u00a0iterm.level\u00a0==\u00a0level\u00a0&amp;&amp;\u00a0iterm.command_name\u00a0\u00a0\u00a0==\u00a0cmd\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0for\u00a0i\u00a0in\u00a0iterm.subcommands\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0if\u00a0i.starts_with(prefix)\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0subcmds.push(i);\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return\u00a0subcmds;\n\u00a0\u00a0\u00a0\u00a0}\n\n\u00a0\u00a0\u00a0\u00a0pub\u00a0fn\u00a0complete_cmd(&amp;self,\u00a0line:\u00a0&amp;str,\u00a0pos:\u00a0usize)\u00a0-&gt;\u00a0\u00a0\u00a0Result&lt;(usize,\u00a0Vec&lt;Pair&gt;)&gt;\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0let\u00a0mut\u00a0entries:\u00a0Vec&lt;Pair&gt;\u00a0=\u00a0Vec::new();\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0let\u00a0d:\u00a0Vec&lt;_&gt;\u00a0=\u00a0line.split('\u00a0').collect();\n\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0if\u00a0d.len()\u00a0==\u00a01\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0if\u00a0d.last()\u00a0==\u00a0Some(&amp;&quot;&quot;)\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0for\u00a0str\u00a0in\u00a0self.level_possible_cmd(1)\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0let\u00a0mut\u00a0replace\u00a0=\u00a0str.clone();\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0replace.push_str(&quot;\u00a0&quot;);\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0entries.push(Pair\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0display:\u00a0str.clone(),\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0replacement:\u00a0replace,\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0});\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return\u00a0Ok((pos,\u00a0entries));\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0if\u00a0let\u00a0Some(last)\u00a0=\u00a0d.last()\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0for\u00a0str\u00a0in\u00a0self.level_prefix_possible_cmd\u00a0\u00a0(1,\u00a0*last)\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0let\u00a0mut\u00a0replace\u00a0=\u00a0str.clone();\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0replace.push_str(&quot;\u00a0&quot;);\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0entries.push(Pair\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0display:\u00a0str.clone(),\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0replacement:\u00a0replace,\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0});\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return\u00a0Ok((pos\u00a0-\u00a0last.len(),\u00a0entries));\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0if\u00a0d.last()\u00a0==\u00a0Some(&amp;&quot;&quot;)\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0for\u00a0str\u00a0in\u00a0self\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0.level_cmd_possible_sub_cmd(d.len()\u00a0-\u00a01,\u00a0\u00a0\u00a0d.get(d.len()\u00a0-\u00a02).unwrap().to_string())\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0let\u00a0mut\u00a0replace\u00a0=\u00a0str.clone();\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0replace.push_str(&quot;\u00a0&quot;);\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0entries.push(Pair\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0display:\u00a0str.clone(),\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0replacement:\u00a0replace,\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0});\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return\u00a0Ok((pos,\u00a0entries));\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0if\u00a0let\u00a0Some(last)\u00a0=\u00a0d.last()\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0for\u00a0str\u00a0in\u00a0self.\u00a0\u00a0level_cmd_possible_prefix_sub_cmd(\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0d.len()\u00a0-\u00a01,\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0d.get(d.len()\u00a0-\u00a02).unwrap().to_string(),\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0*last,\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0)\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0let\u00a0mut\u00a0replace\u00a0=\u00a0str.clone();\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0replace.push_str(&quot;\u00a0&quot;);\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0entries.push(Pair\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0display:\u00a0str.clone(),\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0replacement:\u00a0replace,\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0});\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return\u00a0Ok((pos\u00a0-\u00a0last.len(),\u00a0entries));\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Ok((pos,\u00a0entries))\n\u00a0\u00a0\u00a0\u00a0}\n}\n\nimpl\u00a0Completer\u00a0for\u00a0CommandCompleter\u00a0{\n\u00a0\u00a0\u00a0\u00a0type\u00a0Candidate\u00a0=\u00a0Pair;\n\n\u00a0\u00a0\u00a0\u00a0fn\u00a0complete(&amp;self,\u00a0line:\u00a0&amp;str,\u00a0pos:\u00a0usize,\u00a0_ctx:\u00a0&amp;\u00a0\u00a0Context&lt;'_&gt;)\u00a0-&gt;\u00a0Result&lt;(usize,\u00a0Vec&lt;Pair&gt;)&gt;\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0self.complete_cmd(line,\u00a0pos)\n\u00a0\u00a0\u00a0\u00a0}\n}\n\n\n<\/code><\/pre>\n<p>CommandCompleter 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&#8220;root cm&#8221; root \u4e0b\u5305\u542b cmd1\u3001cmd2 \u4e24\u4e2a\u5b50\u547d\u4ee4\uff0c\u6b64\u65f6\u5982\u679c\u6309 &#8216;tab&#8217;\u952e\uff0ccomplete_cmd \u51fd\u6570\u5c31\u4f1a\u8fd4\u56de (7,[cmd1,cmd2])\u3002<\/p>\n<blockquote>\n<p>\u4f5c\u8005\uff1a\u4eac\u4e1c\u79d1\u6280\u00a0\u8d3e\u4e16\u95fb<\/p>\n<p>\u6765\u6e90\uff1a\u4eac\u4e1c\u4e91\u5f00\u53d1\u8005\u793e\u533a \u8f6c\u8f7d\u8bf7\u6ce8\u660e\u6765\u6e90<\/p>\n<\/blockquote>\n<p><a href=\"https:\/\/segmentfault.com\/a\/1190000044194557\">https:\/\/segmentfault.com\/a\/1190000044194557<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e0a\u6b21\u6211\u4eec\u804a\u5230 CLI \u7684\u9886\u57df\u4ea4\u4e92\u6a21\u5f0f\u3002\u5728\u9886\u57df\u4ea4\u4e92\u6a21\u5f0f\u4e2d\uff0c\u53ef\u80fd\u5b58\u5728\u591a\u5c42\u6b21\u7684\u5b50\u547d\u4ee4\u3002\u5728\u4f7f\u7528\u8fc7\u7a0b\u4e2d\u5982\u679c\u5168\u8bc4\u8bb0\u5fc6\u7684\u8bdd\uff0c 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