[gjs: 1/3] add override GLib.VariantDict.lookup

[Philip Chimento <pchimento src gnome org>]

commit 448847782431d0e8a21891b203d63153b80d9955
Author: Sonny Piers <sonny fastmail net>
Date:   Fri Aug 2 12:19:20 2019 +0200

    add override GLib.VariantDict.lookup

 installed-tests/js/testGLib.js | 11 +++++++++++
 modules/overrides/GLib.js      |  9 +++++++++
 2 files changed, 20 insertions(+)
---
diff --git a/installed-tests/js/testGLib.js b/installed-tests/js/testGLib.js
index b162eee9..1645815b 100644
--- a/installed-tests/js/testGLib.js
+++ b/installed-tests/js/testGLib.js
@@ -70,3 +70,14 @@ describe('GVariant constructor', function () {
             expect(a[ix]).toEqual(val));
     });
 });
+
+describe('GVariantDict lookup', function () {
+    it('returns the unpacked variant', function () {
+        const variantDict = new GLib.VariantDict(null);
+        variantDict.insert_value('foo', GLib.Variant.new_string('bar'));
+        expect(variantDict.lookup('foo')).toEqual('bar');
+        expect(variantDict.lookup('foo', null)).toEqual('bar');
+        expect(variantDict.lookup('foo', 's')).toEqual('bar');
+        expect(variantDict.lookup('foo', new GLib.VariantType('s'))).toEqual('bar');
+    });
+});
diff --git a/modules/overrides/GLib.js b/modules/overrides/GLib.js
index 75b2d9d2..e57555da 100644
--- a/modules/overrides/GLib.js
+++ b/modules/overrides/GLib.js
@@ -301,4 +301,13 @@ function _init() {
         GLib.log_variant(logDomain, logLevel, new GLib.Variant('a{sv}', fields));
     };
 
+    this.VariantDict.prototype.lookup = function(key, variantType = null, deep = false) {
+        if (typeof variantType === 'string')
+            variantType = new GLib.VariantType(variantType);
+
+        const variant = this.lookup_value(key, variantType);
+        if (variant === null)
+            return null;
+        return _unpack_variant(variant, deep);
+    };
 }