GH-17: Patched generated electron code.

Signed-off-by: Akos Kitta <kittaakos@gmail.com>

GH-17/electron-main.js

@@ -0,0 +1,59 @@
+// @ts-check
+const cluster = require('cluster');
+if (cluster.isMaster) {
+    // Workaround for https://github.com/electron/electron/issues/9225. Chrome has an issue where
+    // in certain locales (e.g. PL), image metrics are wrongly computed. We explicitly set the
+    // LC_NUMERIC to prevent this from happening (selects the numeric formatting category of the
+    // C locale, http://en.cppreference.com/w/cpp/locale/LC_categories).
+    if (process.env.LC_ALL) {
+        process.env.LC_ALL = 'C';
+    }
+    process.env.LC_NUMERIC = 'C';
+    const electron = require('electron');
+    electron.app.on('window-all-closed', function () {
+        if (process.platform !== 'darwin') {
+            electron.app.quit();
+        }
+    });
+    electron.app.on('ready', function () {
+        const path = require('path');
+        const { fork } = require('child_process');
+        // Check whether we are in bundled application or development mode.
+        const devMode = process.defaultApp || /node_modules[\/]electron[\/]/.test(process.execPath);
+        const mainWindow = new electron.BrowserWindow({ width: 1024, height: 728, show: false });
+        mainWindow.on('ready-to-show', () => mainWindow.show());
+        const mainPath = path.join(__dirname, '..', 'backend', 'main');
+        const loadMainWindow = function (port) {
+            mainWindow.loadURL(`file://${path.join(__dirname, '../../lib/index.html')}?port=${port}`);
+        };
+        // We need to distinguish between bundled application and development mode when starting the clusters.
+        // https://github.com/electron/electron/issues/6337#issuecomment-230183287
+        if (devMode) {
+            require(mainPath).then(address => {
+                loadMainWindow(address.port);
+            }).catch((error) => {
+                console.error(error);
+                electron.app.exit(1);
+            });
+        } else {
+            const cp = fork(mainPath);
+            cp.on('message', function (message) {
+                loadMainWindow(message);
+            });
+            cp.on('error', function (error) {
+                console.error(error);
+                electron.app.exit(1);
+            });
+            electron.app.on('quit', function() {
+                // If we forked the process for the clusters, we need to manually terminate it.
+                // See: https://github.com/theia-ide/theia/issues/835
+                process.kill(cp.pid);
+            })
+        }
+        mainWindow.on('closed', function () {
+            electron.app.exit(0);
+        });
+    });
+} else {
+    require('../backend/main');
+}

package.json

@@ -11,7 +11,7 @@
     "target": "electron"
   },
   "scripts": {
-    "build": "theia build",
+    "build": "theia build && shx cp ./GH-17/electron-main.js ./src-gen/frontend/",
     "package": "yarn run build && electron-builder",
     "package:all": "yarn run build && electron-builder -lmw"
   },
@@ -41,6 +41,8 @@
   },
   "devDependencies": {
     "@theia/cli": "^0.2.1",
-    "electron-builder": "^19.30.2"
+    "electron-builder": "^19.30.2",
+    "//": "GH-17",
+    "shx": "^0.2.2"
   }
-}
+}