feat(buttons): add checkbox and radio buttons

src/buttons/buttons.js

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+angular.module('ui.bootstrap.buttons', [])
+
+  .constant('buttonConfig', {
+    activeClass:'active'
+  })
+
+  .directive('btnRadio', ['buttonConfig', function (buttonConfig) {
+  var activeClass = buttonConfig.activeClass || 'active';
+
+  return {
+
+    require:'ngModel',
+    link:function (scope, element, attrs, ngModelCtrl) {
+
+      var value = scope.$eval(attrs.btnRadio);
+
+      //model -> UI
+      scope.$watch(function () {
+        return ngModelCtrl.$modelValue;
+      }, function (modelValue) {
+        if (angular.equals(modelValue, value)){
+          element.addClass(activeClass);
+        } else {
+          element.removeClass(activeClass);
+        }
+      });
+
+      //ui->model
+      element.bind('click', function () {
+        if (!element.hasClass(activeClass)) {
+          scope.$apply(function () {
+            ngModelCtrl.$setViewValue(value);
+          });
+        }
+      });
+    }
+  };
+}])
+
+  .directive('btnCheckbox', ['buttonConfig', function (buttonConfig) {
+
+  var activeClass = buttonConfig.activeClass || 'active';
+
+  return {
+    require:'ngModel',
+    link:function (scope, element, attrs, ngModelCtrl) {
+
+      var trueValue = scope.$eval(attrs.btnCheckboxTrue);
+      var falseValue = scope.$eval(attrs.btnCheckboxFalse);
+
+      trueValue = angular.isDefined(trueValue) ? trueValue : true;
+      falseValue = angular.isDefined(falseValue) ? falseValue : false;
+
+      //model -> UI
+      scope.$watch(function () {
+        return ngModelCtrl.$modelValue;
+      }, function (modelValue) {
+        if (angular.equals(modelValue, trueValue)) {
+          element.addClass(activeClass);
+        } else {
+          element.removeClass(activeClass);
+        }
+      });
+
+      //ui->model
+      element.bind('click', function () {
+        scope.$apply(function () {
+          ngModelCtrl.$setViewValue(element.hasClass(activeClass) ? falseValue : trueValue);
+        });
+      });
+    }
+  };
+}]);

src/buttons/docs/demo.html

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+<div ng-controller="ButtonsCtrl">
+    <h4>Single toggle</h4>
+    <pre>{{singleModel}}</pre>
+    <button type="button" class="btn btn-primary" ng-model="singleModel" btn-checkbox btn-checkbox-true="1" btn-checkbox-false="0">
+        Single Toggle
+    </button>
+    <h4>Checkbox</h4>
+    <pre>{{checkModel}}</pre>
+    <div class="btn-group" data-toggle="buttons-checkbox">
+        <button type="button" class="btn btn-primary" ng-model="checkModel.left" btn-checkbox>Left</button>
+        <button type="button" class="btn btn-primary" ng-model="checkModel.middle" btn-checkbox>Middle</button>
+        <button type="button" class="btn btn-primary" ng-model="checkModel.right" btn-checkbox>Right</button>
+    </div>
+    <h4>Radio</h4>
+    <pre>{{radioModel}}</pre>
+    <div class="btn-group" data-toggle="buttons-checkbox">
+        <button type="button" class="btn btn-primary" ng-model="radioModel" btn-radio="'Left'">Left</button>
+        <button type="button" class="btn btn-primary" ng-model="radioModel" btn-radio="'Middle'">Middle</button>
+        <button type="button" class="btn btn-primary" ng-model="radioModel" btn-radio="'Right'">Right</button>
+    </div>
+</div>

src/buttons/docs/demo.js

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+var ButtonsCtrl = function ($scope) {
+
+  $scope.singleModel = 1;
+
+  $scope.radioModel = 'Middle';
+
+  $scope.checkModel = {
+    left: false,
+    middle: true,
+    right: false
+  };
+};

src/buttons/test/buttons.spec.js

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+describe('buttons', function () {
+
+  var $scope, $compile;
+
+  beforeEach(module('ui.bootstrap.buttons'));
+  beforeEach(inject(function (_$rootScope_, _$compile_) {
+    $scope = _$rootScope_;
+    $compile = _$compile_;
+  }));
+
+  describe('checkbox', function () {
+
+    var compileButton = function (markup, scope) {
+      var el = $compile(markup)(scope);
+      scope.$digest();
+      return el;
+    };
+
+    //model -> UI
+    it('should work correctly with default model values', function () {
+      $scope.model = false;
+      var btn = compileButton('<button ng-model="model" btn-checkbox>click</button>', $scope);
+      expect(btn).not.toHaveClass('active');
+
+      $scope.model = true;
+      $scope.$digest();
+      expect(btn).toHaveClass('active');
+    });
+
+    it('should bind custom model values', function () {
+      $scope.model = 1;
+      var btn = compileButton('<button ng-model="model" btn-checkbox btn-checkbox-true="1" btn-checkbox-false="0">click</button>', $scope);
+      expect(btn).toHaveClass('active');
+
+      $scope.model = 0;
+      $scope.$digest();
+      expect(btn).not.toHaveClass('active');
+    });
+
+    //UI-> model
+    it('should toggle default model values on click', function () {
+      $scope.model = false;
+      var btn = compileButton('<button ng-model="model" btn-checkbox>click</button>', $scope);
+
+      btn.click();
+      expect($scope.model).toEqual(true);
+      btn.click();
+      expect($scope.model).toEqual(false);
+    });
+
+    it('should toggle custom model values on click', function () {
+      $scope.model = 0;
+      var btn = compileButton('<button ng-model="model" btn-checkbox btn-checkbox-true="1" btn-checkbox-false="0">click</button>', $scope);
+
+      btn.click();
+      expect($scope.model).toEqual(1);
+      btn.click();
+      expect($scope.model).toEqual(0);
+    });
+  });
+
+  describe('radio', function () {
+
+    var compileButtons = function (markup, scope) {
+      var el = $compile('<div>'+markup+'</div>')(scope);
+      scope.$digest();
+      return el.find('button');
+    };
+
+    //model -> UI
+    it('should work correctly set active class based on model', function () {
+      var btns = compileButtons('<button ng-model="model" btn-radio="1">click1</button><button ng-model="model" btn-radio="2">click2</button>', $scope);
+      expect(btns.eq(0)).not.toHaveClass('active');
+      expect(btns.eq(1)).not.toHaveClass('active');
+
+      $scope.model = 2;
+      $scope.$digest();
+      expect(btns.eq(0)).not.toHaveClass('active');
+      expect(btns.eq(1)).toHaveClass('active');
+    });
+
+    //UI->model
+    it('should work correctly set active class based on model', function () {
+      var btns = compileButtons('<button ng-model="model" btn-radio="1">click1</button><button ng-model="model" btn-radio="2">click2</button>', $scope);
+      expect($scope.model).toBeUndefined();
+
+      btns.eq(0).click();
+      expect($scope.model).toEqual(1);
+
+      btns.eq(1).click();
+      expect($scope.model).toEqual(2);
+    });
+  });
+});