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Update README.md

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Albert Nigmatzianov 2017-07-24 09:18:37 +02:00 committed by GitHub
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@ -467,6 +467,24 @@ A flag can also be assigned locally which will only apply to that specific comma
RootCmd.Flags().StringVarP(&Source, "source", "s", "", "Source directory to read from") RootCmd.Flags().StringVarP(&Source, "source", "s", "", "Source directory to read from")
``` ```
### Bind Flags with Config
You can also bind your flags with [viper](https://github.com/spf13/viper):
```go
var author string
func init() {
RootCmd.PersistentFlags().StringVar(&author, "author", "YOUR NAME", "Author name for copyright attribution")
viper.BindPFlag("author", RootCmd.PersistentFlags().Lookup("author"))
}
```
In this example the persistent flag `author` is bound with `viper`.
**Note**, that the variable `author` will not be set to the value from config,
when the `--author` flag is not provided by user.
More in [viper documentation](https://github.com/spf13/viper#working-with-flags).
## Positional and Custom Arguments ## Positional and Custom Arguments
Validation of positional arguments can be specified using the `Args` field. Validation of positional arguments can be specified using the `Args` field.
@ -497,25 +515,6 @@ Args: func validColorArgs(cmd *cobra.Command, args []string) error {
``` ```
### Bind Flags with Config
You can also bind your flags with [viper](https://github.com/spf13/viper):
```go
var author string
func init() {
RootCmd.PersistentFlags().StringVar(&author, "author", "YOUR NAME", "Author name for copyright attribution")
viper.BindPFlag("author", RootCmd.PersistentFlags().Lookup("author"))
}
```
In this example the persistent flag `author` is bound with `viper`.
**Note**, that the variable `author` will not be set to the value from config,
when the `--author` flag is not provided by user.
More in [viper documentation](https://github.com/spf13/viper#working-with-flags).
## Example ## Example
In the example below, we have defined three commands. Two are at the top level In the example below, we have defined three commands. Two are at the top level