Add Context::option_manager()

it returns the more specific option manager available
(window -> buffer -> global)

src/context.hh

@@ -32,6 +32,16 @@ struct Context
         return *m_window;
     }
     bool has_window() const { return m_window; }
+
+    OptionManager& option_manager() const
+    {
+        if (m_window)
+            return m_window->option_manager();
+        if (m_buffer)
+            return m_buffer->option_manager();
+        return GlobalOptionManager::instance();
+    }
+
 public:
     safe_ptr<Window> m_window;
     safe_ptr<Buffer> m_buffer;

src/main.cc

@@ -440,7 +440,7 @@ int main(int argc, char* argv[])
                                    { return context.window().selections_content().back(); });
     shell_manager.register_env_var("opt_.+",
                                    [](const String& name, const Context& context)
-                                   { return context.window().option_manager()[name.substr(4)].as_string(); });
+                                   { return context.option_manager()[name.substr(4)].as_string(); });
     register_commands();
     register_highlighters();
     register_filters();