gnome-shell/js/misc/extensionUtils.js

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// -*- 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 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);
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// 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];
for (let i = 0; i < required.length; i++) {
let requiredArray = required[i].split('.');
if (requiredArray[0] === major &&
(requiredArray[1] === undefined && isFinite(minor) ||
requiredArray[1] === minor))
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 = { ...extension.metadata };
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;
}