Implement Calculate action

src/actions.ts

@@ -14,6 +14,7 @@ import Url from "~/actions/url";
 import Date from "~/actions/date";
 import Count from "~/actions/count";
 import ChooseFromMenu from "~/actions/choose-from-menu";
+import Math from "~/actions/math";
 
 interface ActionDefinitions {
     [key: string]: ActionDefinition
@@ -49,6 +50,7 @@ export let actions: ActionDefinitions = {
     'conditional': IfElse,
     'repeat.count': Repeat,
     'repeat.each': RepeatWithEach,
+    'math': Math,
 };
 
 export function actionText(text: string): HTMLElement {

src/actions/math.ts

@@ -0,0 +1,21 @@
+import {renderValue} from "~/value";
+import {renderActionHeader} from "~/render";
+import {actions} from "~/actions";
+
+interface MathParameters {
+    WFInput: string | object
+    WFMathOperation: string | object
+    WFMathOperand: string | object
+}
+
+export default {
+    icon: "plus_slash_minus",
+    background: "#8e8e93",
+    render: (container: HTMLElement, params: MathParameters) => {
+        return renderActionHeader(actions['math'],
+            renderValue(params['WFInput'], 'Number'),
+            renderValue(params['WFMathOperation'] ?? '+', 'Operation'),
+            renderValue(params['WFMathOperand'], 'Number'),
+        );
+    }
+}