refactor main-app process

clean unnecessary codes

index.js

@@ -1,10 +1,85 @@
+const { app } = require('electron')
+const ChildProcess = require('child_process')
+const path = require('path')
+
+var error = null
+
 function isFinderCalled () {
   var argv = process.argv.slice(1)
   return argv.some((arg) => arg.match(/--finder/))
 }
 
+function execMainApp () {
+  const appRootPath = path.join(process.execPath, '../..')
+  const updateDotExePath = path.join(appRootPath, 'Update.exe')
+  const exeName = path.basename(process.execPath)
+
+  function spawnUpdate (args, cb) {
+    var stdout = ''
+    var updateProcess = null
+    try {
+      updateProcess = ChildProcess.spawn(updateDotExePath, args)
+    } catch (e) {
+      process.nextTick(function () {
+        cb(e)
+      })
+    }
+
+    updateProcess.stdout.on('data', function (data) {
+      stdout += data
+    })
+
+    updateProcess.on('error', function (_error) {
+      error = _error
+    })
+    updateProcess.on('close', function (code, signal) {
+      if (code !== 0) {
+        error = new Error('Command failed: #{signal ? code}')
+        error.code = code
+        error.stdout = stdout
+      }
+
+      cb(error, stdout)
+    })
+  }
+
+  var handleStartupEvent = function () {
+    if (process.platform !== 'win32') {
+      return false
+    }
+
+    var squirrelCommand = process.argv[1]
+    switch (squirrelCommand) {
+      case '--squirrel-install':
+        spawnUpdate(['--createShortcut', exeName], function (err) {
+          if (err) console.error(err)
+          app.quit()
+        })
+        return true
+      case '--squirrel-updated':
+        app.quit()
+        return true
+      case '--squirrel-uninstall':
+        spawnUpdate(['--removeShortcut', exeName], function (err) {
+          if (err) console.error(err)
+          app.quit()
+        })
+        return true
+      case '--squirrel-obsolete':
+        app.quit()
+        return true
+    }
+  }
+
+  if (handleStartupEvent()) {
+    return
+  }
+
+  require('./lib/main-app')
+}
+
 if (isFinderCalled()) {
   require('./lib/finder-app')
 } else {
-  require('./lib/main-app')
+  execMainApp()
 }