Add shitty and primitive map operation

src/Dispatcher.ts

@@ -121,6 +121,7 @@ export default class Dispatch {
         split: {dispatcher: DispatcherStandardInputStream, operation: TextOperations.Split},
         trim: {dispatcher: DispatcherStandardInputStream, operation: TextOperations.Trim},
         cat: {dispatcher: DispatcherStandardInputStream, operation: TextOperations.Cat},
+        map: {dispatcher: DispatcherStandardInputStream, operation: TextOperations.Map},
         /* join: {dispIInputStreamDelegaterStandardInputStream, operation: TextOperations.Join} */
     };
     public streamDelegate?: IStreamDelegate;

src/TextOperations.ts

@@ -113,3 +113,17 @@ export class Cat implements IStreamingOperation {
         return data + this.stringToConcatenate;
     }
 }
+
+
+export class Map implements IStreamingOperation {
+    private debug = Debug('Map');
+    private func: any;
+
+    public parse(args: string[]): void {
+        this.func = args.join(' ');
+    }
+
+    public run(data: string): string {
+        return eval(this.func)(data);
+    }
+}

test/DispatchSpec.ts

@@ -59,4 +59,15 @@ describe('DispatcherStandardInputStream', function () {
         stdin.write('ello\nsomething');
         stdin.end();
     });
+
+    it('Dispatches to map', function (done) {
+        const cat = new TextOperations.Map();
+        dispatch
+            .dispatch(cat, [`(x) => {const path = require('path'); return x + path.extname(x);}`])
+            .then(() => expect(handlerDelegate.buffer).to.deep.equal(['hello.world.world']))
+            .then(() => done())
+            .catch((err) => console.log(err));
+        stdin.write('hello.world');
+        stdin.end();
+    });
 });