Allow to dynamically add custom functions at runtime. This is very helpful for scenarios where the custom function is very domain-specific and does not make sense to add to the Luckysheet codebase.

Developer will have to be cognizant of locals and needs to handle providing the appropriate text based on the current locale.

src/core.js

@@ -126,6 +126,7 @@ luckysheet.create = function (setting) {
     luckysheetConfigsetting.workbookCreateBefore = extendsetting.workbookCreateBefore;
     luckysheetConfigsetting.workbookCreateAfter = extendsetting.workbookCreateAfter;
     luckysheetConfigsetting.remoteFunction = extendsetting.remoteFunction;
+    luckysheetConfigsetting.customFunctions = extendsetting.customFunctions;
 
     luckysheetConfigsetting.fireMousedown = extendsetting.fireMousedown;
     luckysheetConfigsetting.forceCalculation = extendsetting.forceCalculation;
@@ -156,7 +157,7 @@ luckysheet.create = function (setting) {
     initPlugins(extendsetting.plugins , extendsetting.data);
 
     // Store formula information, including internationalization
-    functionlist();
+    functionlist(extendsetting.customFunctions);
 
     let devicePixelRatio = extendsetting.devicePixelRatio;
     if(devicePixelRatio == null){

src/function/functionlist.js

@@ -3,10 +3,10 @@ import Store from '../store/index'
 import locale from '../locale/locale';
 //{"0":"数学","1":"统计","2":"查找","3":"Luckysheet内置","4":"数据挖掘","5":"数据源","6":"日期","7":"过滤器","8":"财务","9":"工程计算","10":"逻辑","11":"运算符","12":"文本","13":"转换工具","14":"数组"}
 
-const functionlist = function(){
+const functionlist = function(customFunctions){
     let _locale = locale();
     // internationalization,get function list
-    let functionListOrigin = _locale.functionlist;
+    let functionListOrigin = [..._locale.functionlist];
 
     // add new property f
     for (let i = 0; i < functionListOrigin.length; i++) {
@@ -14,6 +14,10 @@ const functionlist = function(){
         func.f = functionImplementation[func.n];
     }
 
+    if (customFunctions) {
+        functionListOrigin.push(...customFunctions);
+    }
+
     Store.functionlist = functionListOrigin;
     
     // get n property
@@ -29,4 +33,4 @@ const functionlist = function(){
     Store.luckysheet_function = luckysheet_function;
 }
 
-export default functionlist;
+export default functionlist;