4 files changed, 212 insertions, 0 deletions
diff --git a/comm/mail/components/devtools/components.conf b/comm/mail/components/devtools/components.conf
new file mode 100644
index 0000000000..023940a05f
--- /dev/null
+++ b/comm/mail/components/devtools/components.conf
@@ -0,0 +1,15 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+Classes = [
+  {
+    'cid': '{089694e9-106a-4704-abf7-62a88545e194}',
+    'contract_ids': ['@mozilla.org/messenger/devtools-startup-clh;1'],
+    'jsm': 'resource:///modules/devtools-loader.jsm',
+    'constructor': 'DevToolsStartup',
+    'categories': {'command-line-handler': 'm-aaa-tb-devtools'},
+  },
+]
diff --git a/comm/mail/components/devtools/devtools-loader.jsm b/comm/mail/components/devtools/devtools-loader.jsm
new file mode 100644
index 0000000000..a951bb2b94
--- /dev/null
+++ b/comm/mail/components/devtools/devtools-loader.jsm
@@ -0,0 +1,80 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+function DevToolsStartup() {}
+
+DevToolsStartup.prototype = {
+  QueryInterface: ChromeUtils.generateQI(["nsICommandLineHandler"]),
+
+  helpInfo: "",
+  handle(cmdLine) {
+    this.initialize();
+
+    // We want to overwrite the -devtools flag and open the toolbox instead
+    let devtoolsFlag = cmdLine.handleFlag("devtools", false);
+    if (devtoolsFlag) {
+      this.handleDevToolsFlag(cmdLine);
+    }
+  },
+
+  handleDevToolsFlag(cmdLine) {
+    const { BrowserToolboxLauncher } = ChromeUtils.importESModule(
+      "resource://devtools/client/framework/browser-toolbox/Launcher.sys.mjs"
+    );
+    BrowserToolboxLauncher.init();
+
+    if (cmdLine.state == Ci.nsICommandLine.STATE_REMOTE_AUTO) {
+      cmdLine.preventDefault = true;
+    }
+  },
+
+  initialize() {
+    let { loader, require, DevToolsLoader } = ChromeUtils.importESModule(
+      "resource://devtools/shared/loader/Loader.sys.mjs"
+    );
+    let { DevToolsServer } = require("devtools/server/devtools-server");
+    let { gDevTools } = require("devtools/client/framework/devtools");
+
+    // Set up the client and server chrome window type, make sure it can't be set
+    Object.defineProperty(DevToolsServer, "chromeWindowType", {
+      get: () => "mail:3pane",
+      set: () => {},
+      configurable: true,
+    });
+    Object.defineProperty(gDevTools, "chromeWindowType", {
+      get: () => "mail:3pane",
+      set: () => {},
+      configurable: true,
+    });
+
+    // Make sure our root actor is always registered, no matter how devtools are called.
+    let devtoolsRegisterActors =
+      DevToolsServer.registerActors.bind(DevToolsServer);
+    DevToolsServer.registerActors = function (options) {
+      devtoolsRegisterActors(options);
+      if (options.root) {
+        const {
+          createRootActor,
+        } = require("resource:///modules/tb-root-actor.js");
+        DevToolsServer.setRootActor(createRootActor);
+      }
+    };
+
+    // Make the loader visible to the debugger by default and for the already
+    // loaded instance. Thunderbird now also provides the Browser Toolbox for
+    // chrome debugging, which uses its own separate loader instance.
+    DevToolsLoader.prototype.invisibleToDebugger = false;
+    loader.invisibleToDebugger = false;
+    DevToolsServer.allowChromeProcess = true;
+
+    // Initialize and load the toolkit/browser actors. This will also call above function to set the
+    // Thunderbird root actor
+    DevToolsServer.init();
+    DevToolsServer.registerAllActors();
+  },
+};
+
+var EXPORTED_SYMBOLS = ["DevToolsStartup"];
diff --git a/comm/mail/components/devtools/moz.build b/comm/mail/components/devtools/moz.build
new file mode 100644
index 0000000000..fbe8acc2cb
--- /dev/null
+++ b/comm/mail/components/devtools/moz.build
@@ -0,0 +1,13 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+EXTRA_JS_MODULES += [
+    "devtools-loader.jsm",
+    "tb-root-actor.js",
+]
+
+XPCOM_MANIFESTS += [
+    "components.conf",
+]
diff --git a/comm/mail/components/devtools/tb-root-actor.js b/comm/mail/components/devtools/tb-root-actor.js
new file mode 100644
index 0000000000..3f546605f6
--- /dev/null
+++ b/comm/mail/components/devtools/tb-root-actor.js
@@ -0,0 +1,104 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* globals loader, require, exports */
+
+/**
+ * Actors for Thunderbird Developer Tools, for example the root actor or tab
+ * list actor.
+ */
+
+var { ActorRegistry } = require("devtools/server/actors/utils/actor-registry");
+
+loader.lazyRequireGetter(
+  this,
+  "RootActor",
+  "devtools/server/actors/root",
+  true
+);
+loader.lazyRequireGetter(
+  this,
+  "BrowserTabList",
+  "devtools/server/actors/webbrowser",
+  true
+);
+loader.lazyRequireGetter(
+  this,
+  "BrowserAddonList",
+  "devtools/server/actors/webbrowser",
+  true
+);
+loader.lazyRequireGetter(
+  this,
+  "sendShutdownEvent",
+  "devtools/server/actors/webbrowser",
+  true
+);
+loader.lazyRequireGetter(
+  this,
+  "WorkerDescriptorActorList",
+  "devtools/server/actors/worker/worker-descriptor-actor-list",
+  true
+);
+loader.lazyRequireGetter(
+  this,
+  "ServiceWorkerRegistrationActorList",
+  "devtools/server/actors/worker/service-worker-registration-list",
+  true
+);
+loader.lazyRequireGetter(
+  this,
+  "ProcessActorList",
+  "devtools/server/actors/process",
+  true
+);
+
+/**
+ * Create the root actor for Thunderbird.
+ *
+ * @param aConnection       The debugger connection to create the actor for.
+ * @returns The mail actor for the connection.
+ */
+exports.createRootActor = function (aConnection) {
+  let parameters = {
+    tabList: new TBTabList(aConnection),
+    addonList: new BrowserAddonList(aConnection),
+    workerList: new WorkerDescriptorActorList(aConnection, {}),
+    serviceWorkerRegistrationList: new ServiceWorkerRegistrationActorList(
+      aConnection
+    ),
+    processList: new ProcessActorList(),
+    globalActorFactories: ActorRegistry.globalActorFactories,
+    onShutdown: sendShutdownEvent,
+  };
+
+  // Create the root actor and set the application type
+  let rootActor = new RootActor(aConnection, parameters);
+  rootActor.applicationType = "mail";
+
+  return rootActor;
+};
+
+/**
+ * Thunderbird's version of the tab list. We don't have gBrowser, but tabmail has similar functions
+ * that will be helpful. The tabs displayed are those tabs in tabmail that have a browser element.
+ * This is mainly the contentTabs, but can also be others such as the start page.
+ */
+class TBTabList extends BrowserTabList {
+  _getSelectedBrowser(window) {
+    let tabmail = window.document.getElementById("tabmail");
+    return tabmail ? tabmail.selectedBrowser : null;
+  }
+
+  _getChildren(window) {
+    let tabmail = window.document.getElementById("tabmail");
+    if (!tabmail) {
+      return [];
+    }
+
+    return tabmail.tabInfo
+      .map(tab => tabmail.getBrowserForTab(tab))
+      .filter(Boolean);
+  }
+}