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Add usage example for required flags

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jakekdodd 2018-02-02 17:16:17 -08:00
parent 3a7eb146ba
commit ee504cbef1
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README.md
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@ -337,8 +337,8 @@ rootCmd.Flags().StringVarP(&Source, "source", "s", "", "Source directory to read
### Local Flag on Parent Commands ### Local Flag on Parent Commands
By default Cobra only parses local flags on the target command, any local flags on By default Cobra only parses local flags on the target command, any local flags on
parent commands are ignored. By enabling `Command.TraverseChildren` Cobra will parent commands are ignored. By enabling `Command.TraverseChildren` Cobra will
parse local flags on each command before executing the target command. parse local flags on each command before executing the target command.
```go ```go
@ -366,6 +366,15 @@ when the `--author` flag is not provided by user.
More in [viper documentation](https://github.com/spf13/viper#working-with-flags). More in [viper documentation](https://github.com/spf13/viper#working-with-flags).
### Required 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")
```
## 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