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docs: update user guide (#2128)

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site/content/user_guide.md
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@ -3,7 +3,7 @@
While you are welcome to provide your own organization, typically a Cobra-based While you are welcome to provide your own organization, typically a Cobra-based
application will follow the following organizational structure: application will follow the following organizational structure:
``` ```test
▾ appName/ ▾ appName/
▾ cmd/ ▾ cmd/
add.go add.go
@ -301,6 +301,7 @@ command := cobra.Command{
### Bind Flags with Config ### Bind Flags with Config
You can also bind your flags with [viper](https://github.com/spf13/viper): You can also bind your flags with [viper](https://github.com/spf13/viper):
```go ```go
var author string 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 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: when a flag has not been set, mark it as required:
```go ```go
rootCmd.Flags().StringVarP(&Region, "region", "r", "", "AWS region (required)") rootCmd.Flags().StringVarP(&Region, "region", "r", "", "AWS region (required)")
rootCmd.MarkFlagRequired("region") rootCmd.MarkFlagRequired("region")
``` ```
Or, for persistent flags: Or, for persistent flags:
```go ```go
rootCmd.PersistentFlags().StringVarP(&Region, "region", "r", "", "AWS region (required)") rootCmd.PersistentFlags().StringVarP(&Region, "region", "r", "", "AWS region (required)")
rootCmd.MarkPersistentFlagRequired("region") 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 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: Cobra can enforce that requirement:
```go ```go
rootCmd.Flags().StringVarP(&u, "username", "u", "", "Username (required if password is set)") rootCmd.Flags().StringVarP(&u, "username", "u", "", "Username (required if password is set)")
rootCmd.Flags().StringVarP(&pw, "password", "p", "", "Password (required if username 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 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: exclusive options such as specifying an output format as either `--json` or `--yaml` but never both:
```go ```go
rootCmd.Flags().BoolVar(&ofJson, "json", false, "Output in JSON") rootCmd.Flags().BoolVar(&ofJson, "json", false, "Output in JSON")
rootCmd.Flags().BoolVar(&ofYaml, "yaml", false, "Output in YAML") 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`. 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: This can be combined with `MarkFlagsMutuallyExclusive` to enforce exactly one flag from a given group:
```go ```go
rootCmd.Flags().BoolVar(&ofJson, "json", false, "Output in JSON") rootCmd.Flags().BoolVar(&ofJson, "json", false, "Output in JSON")
rootCmd.Flags().BoolVar(&ofYaml, "yaml", false, "Output in YAML") 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. 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 ```go
package main 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 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: you don't want aliases. Example:
``` ```bash
$ kubectl remove $ kubectl remove
Error: unknown command "remove" for "kubectl" Error: unknown command "remove" for "kubectl"
@ -787,7 +793,7 @@ func main() {
Example run as a kubectl plugin: Example run as a kubectl plugin:
``` ```bash
$ kubectl myplugin $ kubectl myplugin
Usage: Usage:
kubectl myplugin [command] kubectl myplugin [command]