Add error checking for incorrect files

src/index.ts

@@ -233,7 +233,7 @@ function chooseFile(title, for_save=false) {
     title: title,
     defaultPath: <string>store.get("default_dir", app.getPath("documents")),
     filters: [
-      {name: 'json', extensions: ['json']},
+      {name: 'json', extensions: ['ewe', 'json']},
       {name: 'All Files', extensions: ['*']}
     ]
   }
@@ -271,6 +271,8 @@ function openFile(file_path="", make_new_window=false) {
       if (window && window.title == "Web Editor - splash") {
         window.close();
       }
+    } else {
+      dialog.showErrorBox("Invalid File", `The file you tried to open "${file_path}" is not usable by this application.`)
     }
   }
 }
@@ -334,25 +336,34 @@ function updateMenuBar() {
 
 function loadJson(file_path) {
   let file = fs.readFileSync(file_path);
-  return JSON.parse(file.toString());
+  try {
+    return JSON.parse(file.toString());
+  }
+  catch (e) {
+    return null;
+  }
 }
 
 function checkFile(file_path) {
   let json = loadJson(file_path);
-  let result;
-  let valid_result = false;
-  for (let schema_path of all_schemas) {
-    let schema = loadJson(schema_path);
-    result = validator.validate(json, schema);
-    if (result.valid) {
-      let split_schema = schema_path.split(/[\\/]/);
-      result = {"schema": split_schema[split_schema.length-1], "result": result};
-      valid_result = true;
-      break;
+  if (json != null) {
+    let result;
+    let valid_result = false;
+    for (let schema_path of all_schemas) {
+      let schema = loadJson(schema_path);
+      result = validator.validate(json, schema);
+      if (result.valid) {
+        let split_schema = schema_path.split(/[\\/]/);
+        result = {"schema": split_schema[split_schema.length-1], "result": result};
+        valid_result = true;
+        break;
+      }
     }
-  }
-  if (valid_result) {
-    return result;
+    if (valid_result) {
+      return result;
+    }
+  } else {
+    return null;
   }
 }
 
@@ -436,12 +447,12 @@ ipcMain.on("open", (event, file_path="", new_window=false) => {
 
 ipcMain.on("quit", (event) => {
   if (BrowserWindow.getAllWindows().length > 1) {
-    BrowserWindow.getFocusedWindow().destroy();
+    BrowserWindow.fromWebContents(event.sender).destroy();
   } else {
     app.exit();
   }
 })
 
 ipcMain.on("close-window", (event) => {
-  BrowserWindow.getFocusedWindow().destroy();
+  BrowserWindow.fromWebContents(event.sender).destroy();
 })