[gjs/ewlsh/nova-repl: 4/7] system: Add versionString

[Evan Welsh <ewlsh src gnome org>]

commit 98de2102ea78434a572c8f1f0093e3931795096d
Author: Evan Welsh <contact evanwelsh com>
Date:   Sun Jan 23 23:15:06 2022 -0800

    system: Add versionString

 installed-tests/js/testSystem.js | 6 ++++++
 modules/system.cpp               | 9 ++++++++-
 2 files changed, 14 insertions(+), 1 deletion(-)
---
diff --git a/installed-tests/js/testSystem.js b/installed-tests/js/testSystem.js
index c7bab2ef2..17701bcba 100644
--- a/installed-tests/js/testSystem.js
+++ b/installed-tests/js/testSystem.js
@@ -23,6 +23,12 @@ describe('System.version', function () {
     });
 });
 
+describe('System.versionString', function () {
+    it('gives a correctly formatted string', function () {
+        expect(System.versionString).toMatch(/1.[0-9]{2}.[0-9]/);
+    });
+});
+
 describe('System.refcount()', function () {
     it('gives the correct number', function () {
         let o = new GObject.Object({});
diff --git a/modules/system.cpp b/modules/system.cpp
index 9152cfe38..789a91843 100644
--- a/modules/system.cpp
+++ b/modules/system.cpp
@@ -328,6 +328,10 @@ gjs_js_define_system_stuff(JSContext              *context,
             return false;
     }
 
+    JS::RootedValue v_gjs_version_string(context);
+    if (!gjs_string_from_utf8(context, VERSION, &v_gjs_version_string))
+        return false;
+
     JS::RootedObject program_args_getter(
         context,
         JS_GetFunctionObject(js::NewFunctionByIdWithReserved(
@@ -350,5 +354,8 @@ gjs_js_define_system_stuff(JSContext              *context,
                                  GJS_MODULE_PROP_FLAGS) &&
            JS_DefinePropertyById(context, module, gjs->atoms().version(),
                                  GJS_VERSION,
-                                 GJS_MODULE_PROP_FLAGS | JSPROP_READONLY);
+                                 GJS_MODULE_PROP_FLAGS | JSPROP_READONLY) &&
+           JS_DefineProperty(context, module, "versionString",
+                             v_gjs_version_string,
+                             GJS_MODULE_PROP_FLAGS | JSPROP_READONLY);
 }