Add overwrite for existing sqlite file #178 #156

* Add the ability to overwrite an existing sqlite file if the user
  chooses a sqlite file which already exists.

Signed-off-by: Jillian Daguil <[email protected]>

Author: jdaguil

assets/js/renderer.js

@@ -647,7 +647,7 @@ $(document).ready(function () {
                 reader.pipe(writer);
                 reader.on("end", function () {
                     loadDatabaseFromFile(newFileName);
-                })
+                });
             }
         );
     }
@@ -721,6 +721,16 @@ $(document).ready(function () {
                     function (fileName) {
                         if (fileName === undefined) return;
 
+                        // Overwrite existing sqlite file
+                        if (fs.existsSync(fileName)) {
+                            fs.unlink(fileName, (err) => {
+                              if (err) {
+                                  throw err;
+                              }
+                              console.info(`Deleted ${fileName}`);
+                            });
+                        }
+
                         // Create a new database when importing a json file
                         aboutCodeDB = new AboutCodeDB({
                             dbName: "demo_schema",