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Diffstat (limited to '')
-rw-r--r-- | js/misc/extensionUtils.js | 268 |
1 files changed, 268 insertions, 0 deletions
diff --git a/js/misc/extensionUtils.js b/js/misc/extensionUtils.js new file mode 100644 index 0000000..e9697d4 --- /dev/null +++ b/js/misc/extensionUtils.js @@ -0,0 +1,268 @@ +// -*- mode: js; js-indent-level: 4; indent-tabs-mode: nil -*- +/* exported ExtensionState, ExtensionType, getCurrentExtension, + getSettings, initTranslations, openPrefs, isOutOfDate, + installImporter, serializeExtension, deserializeExtension */ + +// Common utils for the extension system and the extension +// preferences tool + +const { Gio, GLib } = imports.gi; + +const Gettext = imports.gettext; +const Lang = imports.lang; + +const Config = imports.misc.config; + +var ExtensionType = { + SYSTEM: 1, + PER_USER: 2, +}; + +var ExtensionState = { + ENABLED: 1, + DISABLED: 2, + ERROR: 3, + OUT_OF_DATE: 4, + DOWNLOADING: 5, + INITIALIZED: 6, + + // Used as an error state for operations on unknown extensions, + // should never be in a real extensionMeta object. + UNINSTALLED: 99, +}; + +const SERIALIZED_PROPERTIES = [ + 'type', + 'state', + 'path', + 'error', + 'hasPrefs', + 'hasUpdate', + 'canChange', +]; + +/** + * getCurrentExtension: + * + * @returns {?object} - The current extension, or null if not called from + * an extension. + */ +function getCurrentExtension() { + let stack = new Error().stack.split('\n'); + let extensionStackLine; + + // Search for an occurrence of an extension stack frame + // Start at 1 because 0 is the stack frame of this function + for (let i = 1; i < stack.length; i++) { + if (stack[i].includes('/gnome-shell/extensions/')) { + extensionStackLine = stack[i]; + break; + } + } + if (!extensionStackLine) + return null; + + // The stack line is like: + // init([object Object])@/home/user/data/gnome-shell/extensions/u@u.id/prefs.js:8 + // + // In the case that we're importing from + // module scope, the first field is blank: + // @/home/user/data/gnome-shell/extensions/u@u.id/prefs.js:8 + let match = new RegExp('@(.+):\\d+').exec(extensionStackLine); + if (!match) + return null; + + // local import, as the module is used from outside the gnome-shell process + // as well (not this function though) + let extensionManager = imports.ui.main.extensionManager; + + let path = match[1]; + let file = Gio.File.new_for_path(path); + + // Walk up the directory tree, looking for an extension with + // the same UUID as a directory name. + while (file != null) { + let extension = extensionManager.lookup(file.get_basename()); + if (extension !== undefined) + return extension; + file = file.get_parent(); + } + + return null; +} + +/** + * initTranslations: + * @param {string=} domain - the gettext domain to use + * + * Initialize Gettext to load translations from extensionsdir/locale. + * If @domain is not provided, it will be taken from metadata['gettext-domain'] + */ +function initTranslations(domain) { + let extension = getCurrentExtension(); + + if (!extension) + throw new Error('initTranslations() can only be called from extensions'); + + domain = domain || extension.metadata['gettext-domain']; + + // Expect USER extensions to have a locale/ subfolder, otherwise assume a + // SYSTEM extension that has been installed in the same prefix as the shell + let localeDir = extension.dir.get_child('locale'); + if (localeDir.query_exists(null)) + Gettext.bindtextdomain(domain, localeDir.get_path()); + else + Gettext.bindtextdomain(domain, Config.LOCALEDIR); +} + +/** + * getSettings: + * @param {string=} schema - the GSettings schema id + * @returns {Gio.Settings} - a new settings object for @schema + * + * Builds and returns a GSettings schema for @schema, using schema files + * in extensionsdir/schemas. If @schema is omitted, it is taken from + * metadata['settings-schema']. + */ +function getSettings(schema) { + let extension = getCurrentExtension(); + + if (!extension) + throw new Error('getSettings() can only be called from extensions'); + + schema = schema || extension.metadata['settings-schema']; + + const GioSSS = Gio.SettingsSchemaSource; + + // Expect USER extensions to have a schemas/ subfolder, otherwise assume a + // SYSTEM extension that has been installed in the same prefix as the shell + let schemaDir = extension.dir.get_child('schemas'); + let schemaSource; + if (schemaDir.query_exists(null)) { + schemaSource = GioSSS.new_from_directory(schemaDir.get_path(), + GioSSS.get_default(), + false); + } else { + schemaSource = GioSSS.get_default(); + } + + let schemaObj = schemaSource.lookup(schema, true); + if (!schemaObj) + throw new Error(`Schema ${schema} could not be found for extension ${extension.metadata.uuid}. Please check your installation`); + + return new Gio.Settings({ settings_schema: schemaObj }); +} + +/** + * openPrefs: + * + * Open the preference dialog of the current extension + */ +function openPrefs() { + const extension = getCurrentExtension(); + + if (!extension) + throw new Error('openPrefs() can only be called from extensions'); + + try { + const extensionManager = imports.ui.main.extensionManager; + extensionManager.openExtensionPrefs(extension.uuid, '', {}); + } catch (e) { + if (e.name === 'ImportError') + throw new Error('openPrefs() cannot be called from preferences'); + logError(e, 'Failed to open extension preferences'); + } +} + +/** + * versionCheck: + * @param {string[]} required - an array of versions we're compatible with + * @param {string} current - the version we have + * @returns {bool} - true if @current is compatible with @required + * + * Check if a component is compatible for an extension. + * @required is an array, and at least one version must match. + * @current must be in the format <major>.<minor>.<point>.<micro> + * <micro> is always ignored + * <point> is ignored if <minor> is even (so you can target the + * whole stable release) + * <minor> and <major> must match + * Each target version must be at least <major> and <minor> + */ +function versionCheck(required, current) { + let currentArray = current.split('.'); + let major = currentArray[0]; + let minor = currentArray[1]; + let point = currentArray[2]; + for (let i = 0; i < required.length; i++) { + let requiredArray = required[i].split('.'); + if (requiredArray[0] == major && + requiredArray[1] == minor && + ((requiredArray[2] === undefined && parseInt(minor) % 2 == 0) || + requiredArray[2] == point)) + return true; + } + return false; +} + +function isOutOfDate(extension) { + if (!versionCheck(extension.metadata['shell-version'], Config.PACKAGE_VERSION)) + return true; + + return false; +} + +function serializeExtension(extension) { + let obj = {}; + Lang.copyProperties(extension.metadata, obj); + + SERIALIZED_PROPERTIES.forEach(prop => { + obj[prop] = extension[prop]; + }); + + let res = {}; + for (let key in obj) { + let val = obj[key]; + let type; + switch (typeof val) { + case 'string': + type = 's'; + break; + case 'number': + type = 'd'; + break; + case 'boolean': + type = 'b'; + break; + default: + continue; + } + res[key] = GLib.Variant.new(type, val); + } + + return res; +} + +function deserializeExtension(variant) { + let res = { metadata: {} }; + for (let prop in variant) { + let val = variant[prop].unpack(); + if (SERIALIZED_PROPERTIES.includes(prop)) + res[prop] = val; + else + res.metadata[prop] = val; + } + // add the 2 additional properties to create a valid extension object, as createExtensionObject() + res.uuid = res.metadata.uuid; + res.dir = Gio.File.new_for_path(res.path); + return res; +} + +function installImporter(extension) { + let oldSearchPath = imports.searchPath.slice(); // make a copy + imports.searchPath = [extension.dir.get_parent().get_path()]; + // importing a "subdir" creates a new importer object that doesn't affect + // the global one + extension.imports = imports[extension.uuid]; + imports.searchPath = oldSearchPath; +} |