From 0fc86c2ffd0326b6f6ed5fa36803d26993655c08 Mon Sep 17 00:00:00 2001 From: Xinwei Xiong <3293172751NSS@gmail.com> Date: Mon, 8 Apr 2024 18:47:35 +0800 Subject: [PATCH] docs: update user guide (#2128) --- site/content/user_guide.md | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-) diff --git a/site/content/user_guide.md b/site/content/user_guide.md index 3b42ef044..93e87d66d 100644 --- a/site/content/user_guide.md +++ b/site/content/user_guide.md @@ -3,7 +3,7 @@ While you are welcome to provide your own organization, typically a Cobra-based application will follow the following organizational structure: -``` +```test ▾ appName/ ▾ cmd/ add.go @@ -301,6 +301,7 @@ command := cobra.Command{ ### Bind Flags with Config You can also bind your flags with [viper](https://github.com/spf13/viper): + ```go var author string @@ -320,12 +321,14 @@ More in [viper documentation](https://github.com/spf13/viper#working-with-flags) Flags are optional by default. If instead you wish your command to report an error when a flag has not been set, mark it as required: + ```go rootCmd.Flags().StringVarP(&Region, "region", "r", "", "AWS region (required)") rootCmd.MarkFlagRequired("region") ``` Or, for persistent flags: + ```go rootCmd.PersistentFlags().StringVarP(&Region, "region", "r", "", "AWS region (required)") rootCmd.MarkPersistentFlagRequired("region") @@ -335,6 +338,7 @@ rootCmd.MarkPersistentFlagRequired("region") If you have different flags that must be provided together (e.g. if they provide the `--username` flag they MUST provide the `--password` flag as well) then Cobra can enforce that requirement: + ```go rootCmd.Flags().StringVarP(&u, "username", "u", "", "Username (required if password is set)") rootCmd.Flags().StringVarP(&pw, "password", "p", "", "Password (required if username is set)") @@ -343,6 +347,7 @@ rootCmd.MarkFlagsRequiredTogether("username", "password") You can also prevent different flags from being provided together if they represent mutually exclusive options such as specifying an output format as either `--json` or `--yaml` but never both: + ```go rootCmd.Flags().BoolVar(&ofJson, "json", false, "Output in JSON") rootCmd.Flags().BoolVar(&ofYaml, "yaml", false, "Output in YAML") @@ -351,6 +356,7 @@ rootCmd.MarkFlagsMutuallyExclusive("json", "yaml") If you want to require at least one flag from a group to be present, you can use `MarkFlagsOneRequired`. This can be combined with `MarkFlagsMutuallyExclusive` to enforce exactly one flag from a given group: + ```go rootCmd.Flags().BoolVar(&ofJson, "json", false, "Output in JSON") rootCmd.Flags().BoolVar(&ofYaml, "yaml", false, "Output in YAML") @@ -428,7 +434,7 @@ by not providing a 'Run' for the 'rootCmd'. We have only defined one flag for a single command. -More documentation about flags is available at https://github.com/spf13/pflag +More documentation about flags is available at https://github.com/spf13/pflag. ```go package main @@ -722,7 +728,7 @@ command.SuggestionsMinimumDistance = 1 You can also explicitly set names for which a given command will be suggested using the `SuggestFor` attribute. This allows suggestions for strings that are not close in terms of string distance, but make sense in your set of commands but for which you don't want aliases. Example: -``` +```bash $ kubectl remove Error: unknown command "remove" for "kubectl" @@ -787,7 +793,7 @@ func main() { Example run as a kubectl plugin: -``` +```bash $ kubectl myplugin Usage: kubectl myplugin [command]