fix: on Linux/Win, hide OSX specific menu items and change 'Shell' to 'File' (#736)

Based on this document:
https://github.com/electron/electron/blob/master/docs/api/menu.md#user-content-notes-on-os-x-application-menu

app/menu.js

@@ -8,9 +8,10 @@ const appName = app.getName();
 // https://github.com/sindresorhus/anatine/blob/master/menu.js
 
 module.exports = function createMenu({createWindow, updatePlugins}) {
-  return [
-    {
-      label: 'Application',
+  const osxApplicationMenu = {
+    // This menu label is overrided by OSX to be the appName
+    // The label is set to appName here so it matches actual behavior
+    label: appName,
     submenu: [
       {
         role: 'about'
@@ -55,9 +56,10 @@ module.exports = function createMenu({createWindow, updatePlugins}) {
         role: 'quit'
       }
     ]
-    },
-    {
-      label: 'Shell',
+  };
+
+  const shellOrFileMenu = {
+    label: process.platform === 'darwin' ? 'Shell' : 'File',
     submenu: [
       {
         label: 'New Window',
@@ -90,13 +92,14 @@ module.exports = function createMenu({createWindow, updatePlugins}) {
         }
       },
       {
-          label: 'Close Terminal Window',
+        label: process.platform === 'darwin' ? 'Close Terminal Window' : 'Quit',
         role: 'close',
         accelerator: 'CmdOrCtrl+Shift+W'
       }
     ]
-    },
-    {
+  };
+
+  const editMenu = {
     label: 'Edit',
     submenu: [
       {
@@ -133,8 +136,26 @@ module.exports = function createMenu({createWindow, updatePlugins}) {
         }
       }
     ]
-    },
+  };
+
+  if (process.platform !== 'darwin') {
+    editMenu.submenu.push(
+      {type: 'separator'},
       {
+        label: 'Preferences...',
+        accelerator: 'Cmd+,',
+        click(item, focusedWindow) {
+          if (focusedWindow) {
+            focusedWindow.rpc.emit('preferences');
+          } else {
+            createWindow(win => win.rpc.emit('preferences'));
+          }
+        }
+      }
+    );
+  }
+
+  const viewMenu = {
     label: 'View',
     submenu: [
       {
@@ -195,8 +216,9 @@ module.exports = function createMenu({createWindow, updatePlugins}) {
         }
       }
     ]
-    },
-    {
+  };
+
+  const pluginsMenu = {
     label: 'Plugins',
     submenu: [
       {
@@ -207,8 +229,9 @@ module.exports = function createMenu({createWindow, updatePlugins}) {
         }
       }
     ]
-    },
-    {
+  };
+
+  const windowMenu = {
     role: 'window',
     submenu: [
       {
@@ -248,8 +271,9 @@ module.exports = function createMenu({createWindow, updatePlugins}) {
         role: 'togglefullscreen'
       }
     ]
-    },
-    {
+  };
+
+  const helpMenu = {
     role: 'help',
     submenu: [
       {
@@ -272,11 +296,12 @@ ${process.platform} ${process.arch} ${os.release()}`;
 
           shell.openExternal(`https://github.com/zeit/hyperterm/issues/new?body=${encodeURIComponent(body)}`);
         }
-        },
-        ...(
-          process.platform === 'darwin' ?
-            [] :
-            [
+      }
+    ]
+  };
+
+  if (process.platform !== 'darwin') {
+    helpMenu.submenu.push(
       {type: 'separator'},
       {
         role: 'about',
@@ -290,9 +315,18 @@ ${process.platform} ${process.arch} ${os.release()}`;
           });
         }
       }
-            ]
-        )
-      ]
+    );
   }
-  ];
+
+  const menu = [].concat(
+    process.platform === 'darwin' ? osxApplicationMenu : [],
+    shellOrFileMenu,
+    editMenu,
+    viewMenu,
+    pluginsMenu,
+    windowMenu,
+    helpMenu
+  );
+
+  return menu;
 };