[gjs: 1/4] ns: Expose __version__ property

[Philip Chimento <pchimento src gnome org>]

commit 9aca552e85a45a3cc1991236becb68bae91ca27c
Author: Florian Müllner <fmuellner gnome org>
Date:   Tue Aug 3 23:33:34 2021 +0200

    ns: Expose __version__ property
    
    It can be useful to know the version of a namespace that has been
    loaded, so expose a corresponding property alongside the name.

 gi/ns.cpp | 8 ++++++++
 1 file changed, 8 insertions(+)
---
diff --git a/gi/ns.cpp b/gi/ns.cpp
index 063b31f0..54ab994d 100644
--- a/gi/ns.cpp
+++ b/gi/ns.cpp
@@ -164,6 +164,13 @@ class Ns : private GjsAutoChar, public CWrapper<Ns> {
         return gjs_string_from_utf8(cx, priv->get(), args.rval());
     }
 
+    GJS_JSAPI_RETURN_CONVENTION
+    static bool get_version(JSContext* cx, unsigned argc, JS::Value* vp) {
+        GJS_CHECK_WRAPPER_PRIV(cx, argc, vp, args, this_obj, Ns, priv);
+        const char *version = g_irepository_get_version(nullptr, priv->get());
+        return gjs_string_from_utf8(cx, version, args.rval());
+    }
+
     static constexpr JSClassOps class_ops = {
         nullptr,  // addProperty
         nullptr,  // deleteProperty
@@ -178,6 +185,7 @@ class Ns : private GjsAutoChar, public CWrapper<Ns> {
     static constexpr JSPropertySpec proto_props[] = {
         JS_STRING_SYM_PS(toStringTag, "GIRepositoryNamespace", JSPROP_READONLY),
         JS_PSG("__name__", &Ns::get_name, GJS_MODULE_PROP_FLAGS),
+        JS_PSG("__version__", &Ns::get_version, GJS_MODULE_PROP_FLAGS & ~JSPROP_ENUMERATE),
         JS_PS_END};
     // clang-format on