How To Dynamically Bind Function To Ng-click Using The Function Expression From Model

I have the following element in my Angular template to generate a button bar with Font Awesome icons:

$parse and do something like this.

app.controller('MainCtrl',['$scope', '$parse', function($scope, $parse) { //<-- inject parse
    //.. Some code

    //Make this as handler to ngClick passing expression which is function name you have in your model
    $scope.callFunc = function(exp){
       $parse(exp)($scope); //Parse the function name to get the expression and invoke it on the scope
    }
    //Your specific function to be called
    $scope.less = function(){
      console.log('less');
    }
    $scope.more = function(){
      console.log('more');
    }

In your view do:-

     data-ng-click="callFunc(btn[1])"

var app = angular.module('plunker', []);

app.controller('MainCtrl', function($scope, $parse) {
  $scope.navigation = {buttonBar:[
    [ "fa-minus", "less()", "Show fewer cloud buttons." ],
    [ "fa-plus", "more()", "Show more cloud buttons." ],
    [ "fa-minus-square", "smaller()", "Make cloud buttons smaller." ],
    [ "fa-plus-square", "bigger()", "Make cloud buttons bigger." ],
    [ "fa-bars", "toggleShowStrings()", "Toggle display of matching strings." ],
    [ "fa-refresh", "initialize();", "Load more content." ],
    [ "fa-undo", "resetQuery()", "Clear query." ]
]};

  $scope.callFunc = function(exp){
    $parse(exp)($scope);
  }
  
  $scope.less = function(){
    console.log('less');
  }
  
  $scope.more = function(){
   console.log('more');
  }
});

    <link data-require="bootstrap-css@*" data-semver="3.2.0"  href="//maxcdn.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.min.css" />
    <script>document.write('<base href="' + document.location + '" />');</script>
    <link  href="style.css" />
    <script data-require="angular.js@1.2.x" src="https://code.angularjs.org/1.2.25/angular.js" data-semver="1.2.25"></script>




  <div ng-app="plunker" ng-controller="MainCtrl">
     <i>Click the first 2 buttons and check the console</i>
    <ul><li 
    data-ng-repeat="btn in navigation.buttonBar" 
    data-ng-click="callFunc(btn[1])"
    class="btn btn-default" style="font-size: 30px; vertical-align: middle;"
    tooltip-placement="bottom" tooltip="{{ btn[2] }}"
><i class="fa {{ btn[0] }}"></i></li></ul>
 </div>