grunt-prompt

grunt-prompt

Add interactive UI to your Gruntfile such as lists, checkboxes, text input with filtering, and password fields, all on the command line.

Grunt-prompt's UI is powered by the amazing Inquirer, a project created by Simon Boudrias.

Getting Started

This plugin requires Grunt ~0.4.1

npm install grunt-prompt --save-dev

One the plugin has been installed, it may be enabled inside your Gruntfile with this line of JavaScript:

grunt.loadNpmTasks('grunt-prompt');

grunt-prompt

Overview

In your project's Gruntfile, add a section named prompt to the data object passed into grunt.initConfig().

grunt-prompt is a multi-task. This means you can create multiple prompts.

grunt.initConfig({
  prompt: {
    target: {
      options: {
        questions: [
          {
            config: 'config.name', // arbitray name or config for any other grunt task
            type: '<question type>', // list, checkbox, confirm, input, password
            message: 'Question to ask the user',
            default: 'value', // default value if nothing is entered
            choices: 'Array|function(answers)',
            validate: function(value), // return true if valid, error message if invalid
            filter:  function(value), // modify the answer
            when: function(answers) // only ask this question when this function returns true
          }
        ]
      }
    },
  },
})

Options

config

Type: String required

This is used for three things:

• It will set or overwrite the config of other Grunt tasks: config: 'jshint.allFiles.reporter'
• The key in the resulting answers object: if (answers['jshint.allFiles.reporter'] === 'custom') {...
• It can be an abitrary value read using grunt.config: grunt.config('jshint.allFiles.reporter')

type

Type: String required

Type of question to ask:

• list: use arrow keys to pick one choice. Returns a string.
• checkbox: use arrow keys and space bar to pick multiple items. Returns an array.
• confirm: Yes/no. Returns a boolean.
• input: Free text input. Returns a string.
• password: Masked input. Returns a string.

Here's an example of each type:

The documentation for Inquiry has more details about type as well as additional typess.

message

Type: String required

Question to ask the user.

Hint: keep it short, users hate to read.

default

Type: String/Array/Boolean/'function' optional

Default value used when the user just hits Enter. If a value field is not provided, the filter value must match the name exactly.

choices

For question types 'list' and 'checkbox': Type: array of hashes

• name The label that is displayed in the UI.
• value optional Value returned. When not used the name is used instead.
• checked optional Choose the option by default. Only for checkbox.

choices: [
  { name: 'jshint', checked: true },
  { name: 'jslint' },
  { name: 'eslint' },
  '---', // puts in a non-selectable separator
  { name: 'I like to live dangerously', value: 'none' }
]

validate

Type: function(value) optional

Return true if it is valid (true true, not a truthy value). Return string message if it is not valid.

filter

Type: function(value) optional

Use a modified version of the input for the answer. Useful for stripping extra characters, converting strings to integers.

when

Type: function(answers) optional

Choose when this question is asked. Perfect for asking questions based on the results of previous questions.

then

Type: function(results) optional

Runs after all questions have been asked.

How to use the results in your Gruntfile

You can also modify how tasks will work by changing options for other tasks. You do not need to write code to do this, it's all in the config var.

Here we will let the user choose what Mocha reporter to use.

config:
  prompt: {
    mochacli: {
      options: {
        questions: [
          {
            config: 'mochacli.options.reporter'
            type: 'list'
            message: 'Which Mocha reporter would you like to use?',
            default: 'spec'
            choices: ['dot', 'spec', 'nyan', 'TAP', 'landing', 'list',
              'progress', 'json', 'JSONconv', 'HTMLconv', 'min', 'doc']
          }
        ]
      }
    }
  }

and create a shortcut:

grunt.registerTask('test',
  [
    'prompt:mochacli',
    'mochacli'
  ]);

And run it:

$ grunt test

How can values be accessed from my own code?

This config value is accessible to all other grunt tasks via grunt.config('<config name>').

If you had this:

config: 'validation'

Then later on in your custom task can access it like this:

var validation = grunt.config('validation');

Usage Examples

This is an example of how grunt-prompt for something like grunt-bump which makes it easy to update your project's version in the package.json, bower.json, and git tag.

prompt: {
  bump: {
    options: {
      questions: [
        {
          config:  'bump.increment',
          type:    'list',
          message: 'Bump version from ' + '<%= pkg.version %>'.cyan + ' to:',
          choices: [
            {
              value: 'build',
              name:  'Build:  '.yellow + (currentVersion + '-?').yellow +
                ' Unstable, betas, and release candidates.'
            },
            {
              value: 'patch',
              name:  'Patch:  '.yellow + semver.inc(currentVersion, 'patch').yellow +
                '   Backwards-compatible bug fixes.'
            },
            {
              value: 'minor',
              name:  'Minor:  '.yellow + semver.inc(currentVersion, 'minor').yellow +
                '   Add functionality in a backwards-compatible manner.'
            },
            {
              value: 'major',
              name:  'Major:  '.yellow + semver.inc(currentVersion, 'major').yellow +
                '   Incompatible API changes.'
            },
            {
              value: 'custom',
              name:  'Custom: ?.?.?'.yellow +
                '   Specify version...'
            }
          ]
        },
        {
          config:   'bump.version',
          type:     'input',
          message:  'What specific version would you like',
          when:     function (answers) {
            return answers['bump.increment'] === 'custom';
          },
          validate: function (value) {
            var valid = semver.valid(value) && true;
            return valid || 'Must be a valid semver, such as 1.2.3-rc1. See ' +
              'http://semver.org/'.blue.underline + ' for more details.';
          }
        },
        {
          config:  'bump.files',
          type:    'checkbox',
          message: 'What should get the new version:',
          choices: [
            {
              value:   'package',
              name:    'package.json' +
                (!grunt.file.isFile('package.json') ? ' file not found, will create one'.grey : ''),
              checked: grunt.file.isFile('package.json')
            },
            {
              value:   'bower',
              name:    'bower.json' +
                (!grunt.file.isFile('bower.json') ? ' file not found, will create one'.grey : ''),
              checked: grunt.file.isFile('bower.json')
            },
            {
              value:   'git',
              name:    'git tag',
              checked: grunt.file.isDir('.git')
            }
          ]
        }
      ]
    }
  }
}

Release History

• 0.2.1 - 4 Feb 2014 - Fix bug when using a function to provide choices.
• 0.2.0 - 26 Jan 2014 - Added then option which runs after questions. Improved docs.
• 0.1.1 - 27 July 2013 - Some documentation cleanup, better screenshots, new example code in the gruntfile, reomved unused tests.
• 0.1.0 - 18 July 2013 - First version, after an exhausting but fun day with the family at Hershey Park.

License

MIT