gulp-function/ts/index.ts

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import "typings-global";
import plugins = require("./gulpfunction.plugins");
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module.exports = function (functionsToExecuteArg:any|any[],executionModeArg:string = 'forEach') {
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//important vars
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let executionMode = executionModeArg; //can be forEach or atEnd
let functionsToExecute = functionsToExecuteArg;
let promiseArray = [];
let runFunction = function(functionArg){
let returnValue = functionArg();
if (typeof returnValue !== "undefined" && typeof returnValue.then !== "undefined") {
promiseArray.push(returnValue);
}
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};
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let checkAndRunFunction = function () {
if (typeof functionsToExecute === "function" ) {
runFunction(functionsToExecute);
} else if (Array.isArray(functionsToExecute)) {
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for (let anyFunction in functionsToExecute) {
runFunction(functionsToExecute[anyFunction]);
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}
} else {
throw new Error("gulp-callfunction: something is strange with the given arguments");
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}
return plugins.Q.all(promiseArray);
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};
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let hasExecutedOnce = false;
let forEach = function (file, enc, cb) { //the forEach function is called for every chunk
switch (executionMode){
case "forEach":
checkAndRunFunction().then(function(){
cb(null, file);
});
break;
case "forFirst":
!hasExecutedOnce ? checkAndRunFunction().then(function(){
cb(null, file);
}) : cb(null, file);
hasExecutedOnce = true;
break;
case "atEnd":
cb(null, file);
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break;
default:
break;
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}
};
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let atEnd = function(cb) {
if (executionMode === "atEnd") {
checkAndRunFunction().then(function(){
cb();
});
} else {
cb();
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}
};
return plugins.through2.obj(forEach,atEnd);
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};