Angular directive to validate input based on minimum words length.

ngminwords.coffee

'use strict'

###*
 # @ngdoc directive
 # @name app.directive:ngMinwords
 # @description Angular directive to validate input based on minimum words length.
 # # ngMinwords
###
angular.module 'app'
  .directive 'ngMinwords', ->
    restrict: 'A'
    require: '?ngModel'
    link: (scope, element, attrs, ctrl) ->

      if (!ctrl)
        return

      minwords = 0

      attrs.$observe('ngMinwords', (value) ->
        minwords = parseInt(value) || 0
        ctrl.$validate()
      )

      ctrl.$validators.minwords = (modelValue, viewValue) ->
        ctrl.$isEmpty(viewValue) || viewValue.match(/\S+/g).length >= minwords