extensionSystem: Turn into a class
The extension system started out as a set of simple functions, but gained more state later, and even some hacks to emit signals without having an object to emit them on. There is no good reason for that weirdness, so rather than imitating an object, wrap the existing system into a real ExtensionManager object. https://bugzilla.gnome.org/show_bug.cgi?id=789852
This commit is contained in:
Florian Müllner
committed by
Florian Müllner
Florian Müllner
parent
d82810240f
commit
ea17740719
@ -8,356 +8,351 @@ const Main = imports.ui.main;
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const { ExtensionState } = ExtensionUtils;
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// Arrays of uuids
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var enabledExtensions;
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// Contains the order that extensions were enabled in.
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var extensionOrder = [];
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// We don't really have a class to add signals on. So, create
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// a simple dummy object, add the signal methods, and export those
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// publically.
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var _signals = {};
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Signals.addSignalMethods(_signals);
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var connect = _signals.connect.bind(_signals);
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var disconnect = _signals.disconnect.bind(_signals);
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const ENABLED_EXTENSIONS_KEY = 'enabled-extensions';
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const DISABLE_USER_EXTENSIONS_KEY = 'disable-user-extensions';
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const EXTENSION_DISABLE_VERSION_CHECK_KEY = 'disable-extension-version-validation';
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var initted = false;
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var enabled;
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var ExtensionManager = class {
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constructor() {
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this._initted = false;
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this._enabled = false;
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function disableExtension(uuid) {
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let extension = ExtensionUtils.extensions[uuid];
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if (!extension)
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return;
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this._enabledExtensions = [];
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this._extensionOrder = [];
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if (extension.state != ExtensionState.ENABLED)
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return;
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Main.sessionMode.connect('updated', this._sessionUpdated.bind(this));
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this._sessionUpdated();
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}
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// "Rebase" the extension order by disabling and then enabling extensions
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// in order to help prevent conflicts.
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disableExtension(uuid) {
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let extension = ExtensionUtils.extensions[uuid];
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if (!extension)
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return;
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// Example:
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// order = [A, B, C, D, E]
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// user disables C
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// this should: disable E, disable D, disable C, enable D, enable E
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if (extension.state != ExtensionState.ENABLED)
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return;
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let orderIdx = extensionOrder.indexOf(uuid);
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let order = extensionOrder.slice(orderIdx + 1);
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let orderReversed = order.slice().reverse();
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// "Rebase" the extension order by disabling and then enabling extensions
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// in order to help prevent conflicts.
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// Example:
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// order = [A, B, C, D, E]
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// user disables C
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// this should: disable E, disable D, disable C, enable D, enable E
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let orderIdx = this._extensionOrder.indexOf(uuid);
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let order = this._extensionOrder.slice(orderIdx + 1);
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let orderReversed = order.slice().reverse();
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for (let i = 0; i < orderReversed.length; i++) {
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let uuid = orderReversed[i];
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try {
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ExtensionUtils.extensions[uuid].stateObj.disable();
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} catch (e) {
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this.logExtensionError(uuid, e);
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}
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}
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if (extension.stylesheet) {
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let theme = St.ThemeContext.get_for_stage(global.stage).get_theme();
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theme.unload_stylesheet(extension.stylesheet);
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delete extension.stylesheet;
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}
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for (let i = 0; i < orderReversed.length; i++) {
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let uuid = orderReversed[i];
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try {
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ExtensionUtils.extensions[uuid].stateObj.disable();
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extension.stateObj.disable();
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} catch (e) {
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logExtensionError(uuid, e);
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this.logExtensionError(uuid, e);
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}
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for (let i = 0; i < order.length; i++) {
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let uuid = order[i];
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try {
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ExtensionUtils.extensions[uuid].stateObj.enable();
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} catch (e) {
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this.logExtensionError(uuid, e);
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}
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}
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this._extensionOrder.splice(orderIdx, 1);
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if (extension.state != ExtensionState.ERROR) {
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extension.state = ExtensionState.DISABLED;
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this.emit('extension-state-changed', extension);
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}
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}
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if (extension.stylesheet) {
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enableExtension(uuid) {
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let extension = ExtensionUtils.extensions[uuid];
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if (!extension)
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return;
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if (extension.state == ExtensionState.INITIALIZED)
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this.initExtension(uuid);
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if (extension.state != ExtensionState.DISABLED)
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return;
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this._extensionOrder.push(uuid);
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let stylesheetNames = [`${global.session_mode}.css`, 'stylesheet.css'];
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let theme = St.ThemeContext.get_for_stage(global.stage).get_theme();
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theme.unload_stylesheet(extension.stylesheet);
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delete extension.stylesheet;
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}
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try {
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extension.stateObj.disable();
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} catch (e) {
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logExtensionError(uuid, e);
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}
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for (let i = 0; i < order.length; i++) {
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let uuid = order[i];
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try {
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ExtensionUtils.extensions[uuid].stateObj.enable();
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} catch (e) {
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logExtensionError(uuid, e);
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for (let i = 0; i < stylesheetNames.length; i++) {
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try {
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let stylesheetFile = extension.dir.get_child(stylesheetNames[i]);
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theme.load_stylesheet(stylesheetFile);
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extension.stylesheet = stylesheetFile;
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break;
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} catch (e) {
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if (e.matches(Gio.IOErrorEnum, Gio.IOErrorEnum.NOT_FOUND))
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continue; // not an error
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log(`Failed to load stylesheet for extension ${uuid}: ${e.message}`);
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return;
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}
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}
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}
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extensionOrder.splice(orderIdx, 1);
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if ( extension.state != ExtensionState.ERROR ) {
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extension.state = ExtensionState.DISABLED;
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_signals.emit('extension-state-changed', extension);
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}
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}
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function enableExtension(uuid) {
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let extension = ExtensionUtils.extensions[uuid];
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if (!extension)
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return;
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if (extension.state == ExtensionState.INITIALIZED)
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initExtension(uuid);
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if (extension.state != ExtensionState.DISABLED)
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return;
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extensionOrder.push(uuid);
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let stylesheetNames = [`${global.session_mode}.css`, 'stylesheet.css'];
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let theme = St.ThemeContext.get_for_stage(global.stage).get_theme();
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for (let i = 0; i < stylesheetNames.length; i++) {
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try {
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let stylesheetFile = extension.dir.get_child(stylesheetNames[i]);
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theme.load_stylesheet(stylesheetFile);
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extension.stylesheet = stylesheetFile;
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break;
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extension.stateObj.enable();
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extension.state = ExtensionState.ENABLED;
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this.emit('extension-state-changed', extension);
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return;
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} catch (e) {
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if (e.matches(Gio.IOErrorEnum, Gio.IOErrorEnum.NOT_FOUND))
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continue; // not an error
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log(`Failed to load stylesheet for extension ${uuid}: ${e.message}`);
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if (extension.stylesheet) {
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theme.unload_stylesheet(extension.stylesheet);
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delete extension.stylesheet;
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}
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this.logExtensionError(uuid, e);
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return;
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}
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}
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try {
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extension.stateObj.enable();
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extension.state = ExtensionState.ENABLED;
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_signals.emit('extension-state-changed', extension);
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return;
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} catch (e) {
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if (extension.stylesheet) {
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theme.unload_stylesheet(extension.stylesheet);
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delete extension.stylesheet;
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}
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logExtensionError(uuid, e);
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return;
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}
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}
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logExtensionError(uuid, error) {
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let extension = ExtensionUtils.extensions[uuid];
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if (!extension)
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return;
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function logExtensionError(uuid, error) {
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let extension = ExtensionUtils.extensions[uuid];
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if (!extension)
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return;
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let message = `${error}`;
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let message = `${error}`;
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extension.state = ExtensionState.ERROR;
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if (!extension.errors)
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extension.errors = [];
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extension.errors.push(message);
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extension.state = ExtensionState.ERROR;
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if (!extension.errors)
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extension.errors = [];
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extension.errors.push(message);
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log('Extension "%s" had error: %s'.format(uuid, message));
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_signals.emit('extension-state-changed', { uuid: uuid,
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log('Extension "%s" had error: %s'.format(uuid, message));
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this.emit('extension-state-changed', { uuid: uuid,
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error: message,
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state: extension.state });
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}
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}
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function loadExtension(extension) {
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// Default to error, we set success as the last step
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extension.state = ExtensionState.ERROR;
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loadExtension(extension) {
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// Default to error, we set success as the last step
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extension.state = ExtensionState.ERROR;
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let checkVersion = !global.settings.get_boolean(EXTENSION_DISABLE_VERSION_CHECK_KEY);
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let checkVersion = !global.settings.get_boolean(EXTENSION_DISABLE_VERSION_CHECK_KEY);
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if (checkVersion && ExtensionUtils.isOutOfDate(extension)) {
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extension.state = ExtensionState.OUT_OF_DATE;
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} else {
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let enabled = enabledExtensions.includes(extension.uuid);
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if (enabled) {
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if (!initExtension(extension.uuid))
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return;
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if (extension.state == ExtensionState.DISABLED)
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enableExtension(extension.uuid);
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if (checkVersion && ExtensionUtils.isOutOfDate(extension)) {
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extension.state = ExtensionState.OUT_OF_DATE;
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} else {
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extension.state = ExtensionState.INITIALIZED;
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let enabled = this._enabledExtensions.includes(extension.uuid);
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if (enabled) {
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if (!this.initExtension(extension.uuid))
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return;
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if (extension.state == ExtensionState.DISABLED)
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this.enableExtension(extension.uuid);
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} else {
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extension.state = ExtensionState.INITIALIZED;
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}
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}
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this.emit('extension-state-changed', extension);
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}
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_signals.emit('extension-state-changed', extension);
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}
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unloadExtension(extension) {
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// Try to disable it -- if it's ERROR'd, we can't guarantee that,
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// but it will be removed on next reboot, and hopefully nothing
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// broke too much.
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this.disableExtension(extension.uuid);
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function unloadExtension(extension) {
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// Try to disable it -- if it's ERROR'd, we can't guarantee that,
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// but it will be removed on next reboot, and hopefully nothing
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// broke too much.
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disableExtension(extension.uuid);
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extension.state = ExtensionState.UNINSTALLED;
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this.emit('extension-state-changed', extension);
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extension.state = ExtensionState.UNINSTALLED;
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_signals.emit('extension-state-changed', extension);
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delete ExtensionUtils.extensions[extension.uuid];
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return true;
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}
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function reloadExtension(oldExtension) {
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// Grab the things we'll need to pass to createExtensionObject
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// to reload it.
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let { uuid: uuid, dir: dir, type: type } = oldExtension;
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// Then unload the old extension.
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unloadExtension(oldExtension);
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// Now, recreate the extension and load it.
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let newExtension;
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try {
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newExtension = ExtensionUtils.createExtensionObject(uuid, dir, type);
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} catch (e) {
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logExtensionError(uuid, e);
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return;
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delete ExtensionUtils.extensions[extension.uuid];
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return true;
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}
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loadExtension(newExtension);
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}
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reloadExtension(oldExtension) {
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// Grab the things we'll need to pass to createExtensionObject
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// to reload it.
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let { uuid: uuid, dir: dir, type: type } = oldExtension;
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function initExtension(uuid) {
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let extension = ExtensionUtils.extensions[uuid];
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let dir = extension.dir;
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// Then unload the old extension.
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this.unloadExtension(oldExtension);
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if (!extension)
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throw new Error("Extension was not properly created. Call loadExtension first");
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let extensionJs = dir.get_child('extension.js');
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if (!extensionJs.query_exists(null)) {
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logExtensionError(uuid, new Error('Missing extension.js'));
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return false;
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}
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let extensionModule;
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let extensionState = null;
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ExtensionUtils.installImporter(extension);
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try {
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extensionModule = extension.imports.extension;
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} catch (e) {
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logExtensionError(uuid, e);
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return false;
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}
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if (extensionModule.init) {
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// Now, recreate the extension and load it.
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let newExtension;
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try {
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extensionState = extensionModule.init(extension);
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newExtension = ExtensionUtils.createExtensionObject(uuid, dir, type);
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} catch (e) {
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logExtensionError(uuid, e);
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this.logExtensionError(uuid, e);
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return;
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}
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this.loadExtension(newExtension);
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}
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initExtension(uuid) {
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let extension = ExtensionUtils.extensions[uuid];
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let dir = extension.dir;
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if (!extension)
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throw new Error("Extension was not properly created. Call loadExtension first");
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let extensionJs = dir.get_child('extension.js');
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if (!extensionJs.query_exists(null)) {
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this.logExtensionError(uuid, new Error('Missing extension.js'));
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return false;
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}
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let extensionModule;
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let extensionState = null;
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ExtensionUtils.installImporter(extension);
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try {
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extensionModule = extension.imports.extension;
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} catch (e) {
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this.logExtensionError(uuid, e);
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return false;
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}
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if (extensionModule.init) {
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try {
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extensionState = extensionModule.init(extension);
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} catch (e) {
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this.logExtensionError(uuid, e);
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return false;
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}
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}
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if (!extensionState)
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extensionState = extensionModule;
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extension.stateObj = extensionState;
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extension.state = ExtensionState.DISABLED;
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this.emit('extension-loaded', uuid);
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return true;
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}
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if (!extensionState)
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extensionState = extensionModule;
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extension.stateObj = extensionState;
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_getEnabledExtensions() {
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let extensions;
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if (Array.isArray(Main.sessionMode.enabledExtensions))
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extensions = Main.sessionMode.enabledExtensions;
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else
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extensions = [];
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extension.state = ExtensionState.DISABLED;
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_signals.emit('extension-loaded', uuid);
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return true;
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}
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if (global.settings.get_boolean(DISABLE_USER_EXTENSIONS_KEY))
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return extensions;
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function getEnabledExtensions() {
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let extensions;
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if (Array.isArray(Main.sessionMode.enabledExtensions))
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extensions = Main.sessionMode.enabledExtensions;
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else
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extensions = [];
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return extensions.concat(global.settings.get_strv(ENABLED_EXTENSIONS_KEY));
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}
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if (global.settings.get_boolean(DISABLE_USER_EXTENSIONS_KEY))
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return extensions;
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_onEnabledExtensionsChanged() {
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let newEnabledExtensions = this._getEnabledExtensions();
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return extensions.concat(global.settings.get_strv(ENABLED_EXTENSIONS_KEY));
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}
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if (!this._enabled)
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return;
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function onEnabledExtensionsChanged() {
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let newEnabledExtensions = getEnabledExtensions();
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if (!enabled)
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return;
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// Find and enable all the newly enabled extensions: UUIDs found in the
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// new setting, but not in the old one.
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newEnabledExtensions.filter(
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uuid => !enabledExtensions.includes(uuid)
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).forEach(uuid => {
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enableExtension(uuid);
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});
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// Find and disable all the newly disabled extensions: UUIDs found in the
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// old setting, but not in the new one.
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enabledExtensions.filter(
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item => !newEnabledExtensions.includes(item)
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).forEach(uuid => {
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disableExtension(uuid);
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});
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enabledExtensions = newEnabledExtensions;
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}
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function _onVersionValidationChanged() {
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// we want to reload all extensions, but only enable
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// extensions when allowed by the sessionMode, so
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// temporarily disable them all
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enabledExtensions = [];
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for (let uuid in ExtensionUtils.extensions)
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reloadExtension(ExtensionUtils.extensions[uuid]);
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enabledExtensions = getEnabledExtensions();
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if (Main.sessionMode.allowExtensions) {
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enabledExtensions.forEach(uuid => {
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enableExtension(uuid);
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// Find and enable all the newly enabled extensions: UUIDs found in the
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// new setting, but not in the old one.
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newEnabledExtensions.filter(
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uuid => !this._enabledExtensions.includes(uuid)
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).forEach(uuid => {
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this.enableExtension(uuid);
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});
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}
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}
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function _loadExtensions() {
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global.settings.connect(`changed::${ENABLED_EXTENSIONS_KEY}`, onEnabledExtensionsChanged);
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global.settings.connect(`changed::${DISABLE_USER_EXTENSIONS_KEY}`, onEnabledExtensionsChanged);
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global.settings.connect(`changed::${EXTENSION_DISABLE_VERSION_CHECK_KEY}`, _onVersionValidationChanged);
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enabledExtensions = getEnabledExtensions();
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let finder = new ExtensionUtils.ExtensionFinder();
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finder.connect('extension-found', (finder, extension) => {
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loadExtension(extension);
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});
|
||||
finder.scanExtensions();
|
||||
}
|
||||
|
||||
function enableAllExtensions() {
|
||||
if (enabled)
|
||||
return;
|
||||
|
||||
if (!initted) {
|
||||
_loadExtensions();
|
||||
initted = true;
|
||||
} else {
|
||||
enabledExtensions.forEach(uuid => {
|
||||
enableExtension(uuid);
|
||||
// Find and disable all the newly disabled extensions: UUIDs found in the
|
||||
// old setting, but not in the new one.
|
||||
this._enabledExtensions.filter(
|
||||
item => !newEnabledExtensions.includes(item)
|
||||
).forEach(uuid => {
|
||||
this.disableExtension(uuid);
|
||||
});
|
||||
|
||||
this._enabledExtensions = newEnabledExtensions;
|
||||
}
|
||||
enabled = true;
|
||||
}
|
||||
|
||||
function disableAllExtensions() {
|
||||
if (!enabled)
|
||||
return;
|
||||
_onVersionValidationChanged() {
|
||||
// we want to reload all extensions, but only enable
|
||||
// extensions when allowed by the sessionMode, so
|
||||
// temporarily disable them all
|
||||
this._enabledExtensions = [];
|
||||
for (let uuid in ExtensionUtils.extensions)
|
||||
this.reloadExtension(ExtensionUtils.extensions[uuid]);
|
||||
this._enabledExtensions = this._getEnabledExtensions();
|
||||
|
||||
if (initted) {
|
||||
extensionOrder.slice().reverse().forEach(uuid => {
|
||||
disableExtension(uuid);
|
||||
if (Main.sessionMode.allowExtensions) {
|
||||
this._enabledExtensions.forEach(uuid => {
|
||||
this.enableExtension(uuid);
|
||||
});
|
||||
}
|
||||
}
|
||||
|
||||
_loadExtensions() {
|
||||
global.settings.connect(`changed::${ENABLED_EXTENSIONS_KEY}`,
|
||||
this._onEnabledExtensionsChanged.bind(this));
|
||||
global.settings.connect(`changed::${DISABLE_USER_EXTENSIONS_KEY}`,
|
||||
this._onEnabledExtensionsChanged.bind(this));
|
||||
global.settings.connect(`changed::${EXTENSION_DISABLE_VERSION_CHECK_KEY}`,
|
||||
this._onVersionValidationChanged.bind(this));
|
||||
|
||||
this._enabledExtensions = this._getEnabledExtensions();
|
||||
|
||||
let finder = new ExtensionUtils.ExtensionFinder();
|
||||
finder.connect('extension-found', (finder, extension) => {
|
||||
this.loadExtension(extension);
|
||||
});
|
||||
finder.scanExtensions();
|
||||
}
|
||||
|
||||
enabled = false;
|
||||
}
|
||||
enableAllExtensions() {
|
||||
if (this._enabled)
|
||||
return;
|
||||
|
||||
function _sessionUpdated() {
|
||||
// For now sessionMode.allowExtensions controls extensions from both the
|
||||
// 'enabled-extensions' preference and the sessionMode.enabledExtensions
|
||||
// property; it might make sense to make enabledExtensions independent
|
||||
// from allowExtensions in the future
|
||||
if (Main.sessionMode.allowExtensions) {
|
||||
if (initted)
|
||||
enabledExtensions = getEnabledExtensions();
|
||||
enableAllExtensions();
|
||||
} else {
|
||||
disableAllExtensions();
|
||||
if (!this._initted) {
|
||||
this._loadExtensions();
|
||||
this._initted = true;
|
||||
} else {
|
||||
this._enabledExtensions.forEach(uuid => {
|
||||
this.enableExtension(uuid);
|
||||
});
|
||||
}
|
||||
this._enabled = true;
|
||||
}
|
||||
}
|
||||
|
||||
function init() {
|
||||
Main.sessionMode.connect('updated', _sessionUpdated);
|
||||
_sessionUpdated();
|
||||
}
|
||||
disableAllExtensions() {
|
||||
if (!this._enabled)
|
||||
return;
|
||||
|
||||
if (this._initted) {
|
||||
this._extensionOrder.slice().reverse().forEach(uuid => {
|
||||
this.disableExtension(uuid);
|
||||
});
|
||||
}
|
||||
|
||||
this._enabled = false;
|
||||
}
|
||||
|
||||
_sessionUpdated() {
|
||||
// For now sessionMode.allowExtensions controls extensions from both the
|
||||
// 'enabled-extensions' preference and the sessionMode.enabledExtensions
|
||||
// property; it might make sense to make enabledExtensions independent
|
||||
// from allowExtensions in the future
|
||||
if (Main.sessionMode.allowExtensions) {
|
||||
if (this._initted)
|
||||
this._enabledExtensions = this._getEnabledExtensions();
|
||||
this.enableAllExtensions();
|
||||
} else {
|
||||
this.disableAllExtensions();
|
||||
}
|
||||
}
|
||||
};
|
||||
Signals.addSignalMethods(ExtensionManager.prototype);
|
||||
|
||||
Reference in New Issue
Block a user