Prompt

A simple Go package to make terminal input styled a little more like console input in Craft CMS commands.

Installation

go get github.com/pixelandtonic/prompt

Example Usage

To create a new default prompt:

p := prompt.NewPrompt()

Passing Options

You can also override the options for a prompt using:

p := prompt.NewWithOptions(opts)

Asking for User Input

To prompt a user to enter input, you simply .Ask:

opts := &prompt.InputOptions{Default: "42"}
a, err := p.Ask("What is the answer to the Ultimate Question of Life, the Universe, and Everything", opts)
if err != nil {
	log.Println(err)
}
fmt.Println("the user answered:", a)

Note: Notice how we did not add a space or ? at the end of the question. The default options when calling .NewPrompt() will always add a space and question mark at the end of the output question. If you want to override that pass options using prompt.Options

If the user does not provide an input, the default value passed in the options will be returned.

Validating Input

You can also validate input with a simple func:

opts := &prompt.InputOptions{Default: "42", Validator: validateTheMeaning}
a, err := p.Ask("What is the answer to the Ultimate Question of Life, the Universe, and Everything", opts)
if err != nil {
	log.Println(err)
}
fmt.Println("the user answered:", a)

The validate function is simple and takes a string and returns an error:

func validateTheMeaning(input string) error {
    if input != "42" {
        return errors.New("wrong, the answer is 42")
    }
    return nil
}

Confirming Actions

You can also use Confirm to always return a boolean which defaults to false

opts := &prompt.InputOptions{Default: "yes"}
confirm, err := p.Confirm("Do you confirm these changes", opts)
if err != nil {
	log.Println(err)
}
fmt.Println("confirmed:", confirm)

You can also pass a validator to confirm, but this will default to checking if the input contains a y.

Providing a Selection

You can also create a selection of items to choose from:

opts := &prompt.SelectOptions{Default: 1}
selected, index, err := p.Select("Select an speed", []string{"Ludicrous mode", "Normal mode"}, opts)
if err != nil {
	log.Println(err)
}