Inline electron-squirrel-startup (Fixes #44)

Now the desktop icon will only be created on installation, not on
update.

packages/insomnia-app/app/main.development.js

@@ -1,5 +1,5 @@
 // @flow
-import needsRestart from 'electron-squirrel-startup';
+import needsRestart from './main/squirrel-startup';
 import * as electron from 'electron';
 import * as errorHandling from './main/error-handling';
 import * as updates from './main/updates';

packages/insomnia-app/app/main/squirrel-startup.js

@@ -0,0 +1,41 @@
+import path from 'path';
+import { spawn } from 'child_process';
+import { app } from 'electron';
+
+function run(args, done) {
+  const updateExe = path.resolve(path.dirname(process.execPath), '..', 'Update.exe');
+  spawn(updateExe, args, {
+    detached: true,
+  }).on('close', done);
+}
+
+function check() {
+  if (process.platform === 'win32') {
+    const cmd = process.argv[1];
+    console.log('processing squirrel command `%s`', cmd);
+    const target = path.basename(process.execPath);
+
+    if (cmd === '--squirrel-install') {
+      run(['--createShortcut=' + target + ''], app.quit);
+      return true;
+    }
+
+    if (cmd === '--squirrel-updated') {
+      app.quit();
+      return true;
+    }
+
+    if (cmd === '--squirrel-uninstall') {
+      run(['--removeShortcut=' + target + ''], app.quit);
+      return true;
+    }
+
+    if (cmd === '--squirrel-obsolete') {
+      app.quit();
+      return true;
+    }
+  }
+  return false;
+}
+
+module.exports = check();

packages/insomnia-app/package.json

@@ -106,7 +106,6 @@
     "codemirror-graphql": "^0.8.3",
     "deep-equal": "^1.0.1",
     "electron-context-menu": "^0.10.0",
-    "electron-squirrel-startup": "^1.0.0",
     "font-scanner": "^0.1.1",
     "fs-extra": "^5.0.0",
     "fuzzysort": "^1.1.1",