(#47) Refactored clipboard provider

Author: s1hofmann

Diff for: lib/provider/native/clipboard-action-provider.interface.ts

@@ -26,7 +26,7 @@ export interface ClipboardActionProvider {
    * @param {string} text The text to copy to the clipboard
    * @memberof ClipboardActionProvider
    */
-  copy(text: string): void;
+  copy(text: string): Promise<void>;
 
   /**
    * paste should allow to paste the current text on the system's clipboard

Diff for: lib/provider/native/clipboardy-clipboard-action.class.ts

@@ -5,16 +5,29 @@ export class ClipboardAction implements ClipboardActionProvider {
   constructor() {
   }
 
-  public hasText(): Promise<boolean> {
-    return Promise.resolve(clippy.readSync().length > 0);
+  public async hasText(): Promise<boolean> {
+    return new Promise<boolean>((resolve, reject) => {
+      try {
+        const content = clippy.readSync();
+        resolve(content.length > 0);
+      } catch (e) {
+        reject(e);
+      }
+    });
   }
 
   public clear(): Promise<boolean> {
-    throw new Error("Method not implemented.");
+    return Promise.reject("Method not implemented.");
   }
 
-  public copy(text: string): void {
-    clippy.writeSync(text);
+  public async copy(text: string): Promise<void> {
+    return new Promise<void>((resolve, reject) => {
+      try {
+        clippy.writeSync(text);
+      } catch (e) {
+        reject(e);
+      }
+    });
   }
 
   public async paste(): Promise<string> {