Awesome

grunt-confirm

Abort or continue the flow of tasks according to an answer (with or without Enter key) to the specified question. The flow of tasks is paused, until the user responds and the next behavior is found by specified options.

Getting Started

This plugin requires Grunt ~0.4.1

If you haven't used Grunt before, be sure to check out the Getting Started guide, as it explains how to create a Gruntfile as well as install and use Grunt plugins. Once you're familiar with that process, you may install this plugin with this command:

npm install grunt-confirm --save-dev

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

grunt.loadNpmTasks('grunt-confirm');

The "confirm" task

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

Options

question

Type: string, function or undefined

Display a specified string or a returned string by a specified function to the user.
If the function returns a falsy, this task is finished immediately. And the flow of tasks is continued.

The function is passed a files argument. That is the standard Grunt files components (see Files).
The function can make the question text by using it.

If this option is not specified when '_key' is specified to the input option and the proceed option is not specified (i.e. you want to let the flow of tasks just pause), a message 'Continue... (Hit any key)' is displayed.

For example:

Gruntfile.js

grunt.initConfig({
  confirm: {
    build: {
      options: {
        // Static text.
        question: 'This processing requires about 10 minutes. Continue?',
        input: '_key:y'
      }
    }
  },
  // Other tasks...
});

grunt.initConfig({
  confirm: {
    deploy: {
      src: '<%= copy.deploy.src %>', // refer to another task
      options: {
        question: function(files) {
          var count = 0;
          files.forEach(function(f) { count += f.src.length; });
          return !count ? false : // No file. And do nothing.
            count + ' files are copied at next task. Are you sure?';
        },
        input: '_key:y'
      }
    }
  },
  copy: {
    deploy: {
      expand: true,
      cwd: 'src/',
      src: '**/*.html',
      dest: 'public_html/'
    }
  }
});

input

Type: string or undefined

Accept the user's input that is specified type.

• If it is not specified (i.e. undefined), accept a text (with an Enter key), and let the proceed option decide whether to continue the flow of tasks.
• If a comma-separated string like 'text1,text2' is specified, accept a text (with an Enter key), and continue the flow of tasks when the input text was found in that comma-separated string, otherwise abort it.
• If '_key' is specified, get a pressed key (without an Enter key), and let the proceed option decide whether to continue the flow of tasks.
• If a string '_key:charlist' is specified, get a pressed key (without an Enter key), and continue the flow of tasks when the pressed key was found in that charlist, otherwise abort it. The charlist is a string that includes characters as the keys. For example, if '_key:abc' is specified, continue the flow of tasks when the A, B or C key is pressed.

The string comparisons are case-insensitive (i.e. a equals A).

proceed

Type: function, boolean or undefined

Decide whether to continue the flow of tasks when the input option is not specified (i.e. undefined) or '_key' is specified to it.

If a function is specified, call the function, and continue the flow of tasks when that returns a truthy, otherwise abort it.
The function is passed an answer and a files arguments. The answer is a string that was input by the user, or a single character as a pressed key by the user. The files is the standard Grunt files components (see Files).
The function can determine to abort or continue by using those.

If false is specified, the flow of tasks is aborted immediately. And the remaining tasks will not run.
Otherwise the flow of tasks is continued. That is, when any text was input or any key was pressed, it is continued. It is just paused until it.

For example:

Gruntfile.js

grunt.initConfig({
  confirm: {
    pack: {
      src: '<%= another.pack.src %>', // refer to another task
      options: {
        question: 'How many files are required?',
        proceed: function(answer, files) {
          var count = 0;
          files.forEach(function(f) { count += f.src.length; });
          if (count < +answer) {
            grunt.log.writeln('There are only ' + count + ' files.');
            return false;
          } else {
            return true;
          }
        }
      }
    }
  },
  // Other tasks...
});

grunt.initConfig({
  confirm: {
    build: {
      options: {
        question: 'Do you want to build? :',
        input: '_key:y' // Continue the flow if `Y` key is pressed.
      }
    }
  },
  // Other tasks...
});

grunt.initConfig({
  confirm: {
    // Show something. Pause until any key is pressed.
    showMessage: {options: {input: '_key'}}
  },
  // Other tasks...
});

See Also

If you want to more process, consider grunt-task-helper and readlineSync.