WebTorrent process

* Separate hidden window, with its own renderer process, for WebTorrent
  (Must be a window. You cannot run WebRTC at all in a Web Worker, and you can't
   run it well in a node process like the electron main process.)

* Disabled the create-torrent-modal for now. That gives us a consistent UX
  regardless of whether the user dragged files or folders onto the app or opened
  the Create New Torrent menu item.

* Main process routes all messages between the main and webtorrent windows.

* The renderer index.js is smaller now (but still too big), with the WebTorrent
  interface moved to webtorrent.js / it's own process.

* The UI should be faster now, and should not lag under load.

main/index.js

@@ -54,6 +54,7 @@ function init () {
   app.on('ready', function () {
     menu.init()
     windows.createMainWindow()
+    windows.createWebTorrentHiddenWindow()
     shortcuts.init()
     tray.init()
     handlers.install()

main/ipc.js

@@ -69,6 +69,28 @@ function init () {
     menu.onPlayerClose()
     shortcuts.unregisterPlayerShortcuts()
   })
+
+  // Capture all events
+  var oldEmit = ipcMain.emit
+  ipcMain.emit = function (name, e, ...args) {
+    // Relay messages between the main window and the WebTorrent hidden window
+    if (name.startsWith('wt-')) {
+      var recipient, recipientStr
+      if (e.sender.browserWindowOptions.title === 'webtorrent-hidden-window') {
+        recipient = windows.main
+        recipientStr = 'main'
+      } else {
+        recipient = windows.webtorrent
+        recipientStr = 'webtorrent'
+      }
+      console.log('sending %s to %s', name, recipientStr)
+      recipient.send(name, ...args)
+      return
+    }
+
+    // Emit all other events normally
+    oldEmit.call(ipcMain, name, e, ...args)
+  }
 }
 
 function setBounds (bounds, maximize) {

main/menu.js

@@ -124,7 +124,10 @@ function showCreateTorrent () {
     properties: [ 'openFile', 'openDirectory' ]
   }, function (filenames) {
     if (!Array.isArray(filenames)) return
-    windows.main.send('dispatch', 'seed', filenames[0])
+    var options = {
+      files: filenames[0]
+    }
+    windows.main.send('dispatch', 'createTorrent', options)
   })
 }
 

main/windows.js

@@ -1,9 +1,10 @@
 var windows = module.exports = {
   about: null,
   main: null,
-  createAboutWindow: createAboutWindow,
-  createMainWindow: createMainWindow,
-  focusWindow: focusWindow
+  createAboutWindow,
+  createWebTorrentHiddenWindow,
+  createMainWindow,
+  focusWindow
 }
 
 var electron = require('electron')
@@ -46,6 +47,25 @@ function createAboutWindow () {
   })
 }
 
+function createWebTorrentHiddenWindow () {
+  var win = windows.webtorrent = new electron.BrowserWindow({
+    backgroundColor: '#ECECEC',
+    show: false,
+    center: true,
+    title: 'webtorrent-hidden-window',
+    width: 500,
+    height: 500,
+    minimizable: false,
+    maximizable: false,
+    fullscreen: false,
+    skipTaskbar: true
+  })
+  win.loadURL(config.WINDOW_WEBTORRENT)
+
+  // To debug the WebTorrent process, set `show` to true above and uncomment:
+  // win.webContents.openDevTools({detached: false})
+}
+
 function createMainWindow () {
   if (windows.main) {
     return focusWindow(windows.main)
@@ -56,7 +76,7 @@ function createMainWindow () {
     icon: config.APP_ICON + '.png',
     minWidth: 375,
     minHeight: 38 + (120 * 2), // header height + 2 torrents
-    show: false, // Hide window until DOM finishes loading
+    show: true, // Hide window until DOM finishes loading
     title: config.APP_WINDOW_TITLE,
     titleBarStyle: 'hidden-inset', // Hide OS chrome, except traffic light buttons (OS X)
     useContentSize: true, // Specify web page size without OS chrome