{"id":208152,"date":"2025-07-08T13:52:27","date_gmt":"2025-07-08T05:52:27","guid":{"rendered":"https:\/\/server.hk\/cnblog\/208152\/"},"modified":"2025-07-08T13:52:27","modified_gmt":"2025-07-08T05:52:27","slug":"%e6%82%a8%e5%8f%af%e4%bb%a5%e4%b8%ba-cobra-%e4%b8%ad%e7%9a%84%e6%a0%87%e5%bf%97%e6%8c%87%e5%ae%9a%e5%8f%af%e9%80%89%e5%8f%82%e6%95%b0%e5%90%97%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/208152\/","title":{"rendered":"\u60a8\u53ef\u4ee5\u4e3a Cobra \u4e2d\u7684\u6807\u5fd7\u6307\u5b9a\u53ef\u9009\u53c2\u6570\u5417\uff1f"},"content":{"rendered":"

<\/b> <\/p>\n

\u5f53\u524d\u4f4d\u7f6e\uff1a ><\/span> ><\/span> ><\/span> ><\/span> \u60a8\u53ef\u4ee5\u4e3a Cobra \u4e2d\u7684\u6807\u5fd7\u6307\u5b9a\u53ef\u9009\u53c2\u6570\u5417\uff1f<\/span><\/p>\n

\u6765\u6e90\uff1astackoverflow<\/span>
\n2024-04-29 16:39:38<\/span>
\n<\/i>0\u6d4f\u89c8<\/span>
\n<\/i>\u6536\u85cf<\/span> <\/p>\n

\u4eb2\u7231\u7684\u7f16\u7a0b\u5b66\u4e60\u7231\u597d\u8005\uff0c\u5982\u679c\u4f60\u70b9\u5f00\u4e86\u8fd9\u7bc7\u6587\u7ae0\uff0c\u8bf4\u660e\u4f60\u5bf9\u300a\u60a8\u53ef\u4ee5\u4e3a Cobra \u4e2d\u7684\u6807\u5fd7\u6307\u5b9a\u53ef\u9009\u53c2\u6570\u5417\uff1f\u300b\u5f88\u611f\u5174\u8da3\u3002\u672c\u7bc7\u6587\u7ae0\u5c31\u6765\u7ed9\u5927\u5bb6\u8be6\u7ec6\u89e3\u6790\u4e00\u4e0b\uff0c\u4e3b\u8981\u4ecb\u7ecd\u4e00\u4e0b\uff0c\u5e0c\u671b\u6240\u6709\u8ba4\u771f\u8bfb\u5b8c\u7684\u7ae5\u978b\u4eec\uff0c\u90fd\u6709\u5b9e\u8d28\u6027\u7684\u63d0\u9ad8\u3002<\/p>\n

\u95ee\u9898\u5185\u5bb9
\n <\/p>\n

\u5047\u8bbe\u6211\u7684\u7a0b\u5e8f\u4e2d\u6709\u8fd9\u4e2a\u6807\u5fd7\uff0c\u5b83\u53ea\u6253\u5370\u6b63\u6570\uff1a<\/p>\n

c.PersistentFlags().IntVar(&SomeFlag, optionSomeFlag, 0, \"\u505a\u67d0\u4e8b(\u8303\u56f4: x-y)\")<\/code><\/p>\n

\u9ed8\u8ba4\u503c\u4e3a 0\uff0c\u56e0\u6b64\u5982\u679c\u7528\u6237\u4e0d\u5207\u6362\u8be5\u6807\u5fd7\uff0c\u5219\u4e0d\u4f1a\u6253\u5370\u4efb\u4f55\u5185\u5bb9\u3002 \u5982\u4f55\u4f7f\u6807\u5fd7\u63a5\u53d7\u53c2\u6570\u4f46\u672c\u8eab\u6709\u9ed8\u8ba4\u503c\uff1f \u5373\u5982\u679c\u9ed8\u8ba4\u503c\u4e3a 5<\/p>\n

.\/program --someflag<\/code> \u8f93\u51fa\u5c06\u662f 5<\/code><\/p>\n

\u4f46\u5982\u679c\u6211\u8fd9\u6837\u505a\u4e86<\/p>\n

.\/program --someflag=1<\/code> \u8f93\u51fa\u5c06\u4e3a 1<\/code><\/p>\n

\u6211\u5c1d\u8bd5\u9075\u5faa Cobra \u7684\u7528\u6237\u6307\u5357\uff0c\u5e76\u671f\u671b\u6709\u4e00\u79cd\u547d\u4ee4\u7c7b\u578b\uff0c\u8be5\u547d\u4ee4\u7c7b\u578b\u5141\u8bb8\u6211\u4ec5\u5728\u7528\u6237\u89e6\u53d1\u8be5\u6807\u5fd7\u65f6\u6307\u5b9a\u9ed8\u8ba4\u503c\uff0c\u800c\u4e0d\u4ec5\u4ec5\u662f\u5b8c\u5168\u6307\u5b9a\u9ed8\u8ba4\u503c\u3002\u6211\u53ef\u80fd\u8bef\u89e3\u4e86\u8fd9\u4e00\u70b9\u6216\u9519\u8fc7\u4e86\u4e00\u4e9b\u4e1c\u897f\u3002<\/p>\n

<\/p>\n

\u6b63\u786e\u7b54\u6848<\/h2>\n

<\/p>\n

\u53ef\u4ee5\u4f7f\u7528nooptdefval\u6765\u5b8c\u6210<\/p>\n

rootcmd.persistentflags().lookup(\"someflag\").nooptdefval = \"5\"<\/pre>\n
\u5728\u4e0b\u9762\u7684\u4ee3\u7801\u4e2d\uff0c\u60a8\u53ef\u4ee5\u627e\u5230\u5177\u6709\u60a8\u63cf\u8ff0\u7684\u884c\u4e3a\u7684\u5e26\u6709 cobra \u7684\u547d\u4ee4\u884c\u5e94\u7528\u7a0b\u5e8f\u7684\u5b8c\u6574\u793a\u4f8b<\/p>\n
package main\n\nimport (\n    \"fmt\"\n    \"github.com\/spf13\/cobra\"\n)\n\nfunc main() {\n    var someflag int\n    var defaultsomeflag = \"5\"\n\n    \/\/ create the root command.\n    rootcmd := &cobra.command{\n        use:   \"program\",\n        short: \"a brief description of your application\",\n        long:  \"a longer description of your application\",\n        run: func(cmd *cobra.command, args []string) {\n            \/\/ check whether the flag was explicitly set.\n            if cmd.flags().lookup(\"someflag\").changed {\n                fmt.printf(\"someflag: %d\\n\", someflag)\n            } else {\n                \/\/ if the flag was not explicitly set don't print a value.\n                fmt.printf(\"someflag is not set\\n\")\n            }\n        },\n    }\n\n    \/\/ define the flag and set its default value.\n    rootcmd.persistentflags().intvar(&someflag, \"someflag\", 0, \"do something (range: x-y)\")\n    rootcmd.persistentflags().lookup(\"someflag\").nooptdefval = defaultsomeflag\n\n    \/\/ execute the root command.\n    if err := rootcmd.execute(); err != nil {\n        fmt.println(err)\n    }\n}<\/pre>\n
\u4e0b\u9762\u662f\u4e0d\u540c\u6807\u5fd7\u503c\u7684\u6267\u884c\u7ed3\u679c\u3002<\/p>\n
$ .\/test\nsomeflag is not set\n$ .\/test --someflag\nsomeflag: 5\n$ .\/test --someflag=3\nsomeflag: 3<\/pre>\n
\u4ee5\u4e0a\u5c31\u662f\u300a\u60a8\u53ef\u4ee5\u4e3a Cobra \u4e2d\u7684\u6807\u5fd7\u6307\u5b9a\u53ef\u9009\u53c2\u6570\u5417\uff1f\u300b\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u5173\u4e8e\u7684\u8d44\u6599\u8bf7\u5173\u6ce8\u516c\u4f17\u53f7\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
\u5f53\u524d\u4f4d\u7f6e\uff1a > > ...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4925],"tags":[],"class_list":["post-208152","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/208152","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=208152"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/208152\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=208152"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=208152"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=208152"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}