Introduce "local" scope in evaluate-commands

When using `eval` a new scope named 'local' gets pushed for the
whole evaluation, this makes it possible to temporarily set
an option/hook/alias...

Local scopes nest so nested evals do work as expected.

Remove the now trivial with-option command

1 files changed, 9 insertions, 0 deletions

diff --git a/src/option_manager.cc b/src/option_manager.cc
index 5dd3d612..0a77548f 100644
--- a/src/option_manager.cc
+++ b/src/option_manager.cc
@@ -28,6 +28,15 @@ OptionManager::~OptionManager()
     kak_assert(m_watchers.empty());
 }
 
+void OptionManager::reparent(OptionManager& parent)
+{
+    if (m_parent)
+        m_parent->unregister_watcher(*this);
+
+    m_parent = &parent;
+    parent.register_watcher(*this);
+}
+
 void OptionManager::register_watcher(OptionManagerWatcher& watcher) const
 {
     kak_assert(not contains(m_watchers, &watcher));