Add a GlobalSetOption hook

src/commands.cc

@@ -758,7 +758,7 @@ static constexpr auto hooks = {
     "BufWritePre", "BufOpenFifo", "BufCloseFifo", "BufReadFifo", "BufSetOption",
     "InsertBegin", "InsertChar", "InsertDelete", "InsertEnd", "InsertIdle", "InsertKey",
     "InsertMove", "InsertCompletionHide", "InsertCompletionShow", "InsertCompletionSelect",
-    "KakBegin", "KakEnd", "FocusIn", "FocusOut", "RuntimeError", "PromptIdle",
+    "KakBegin", "KakEnd", "FocusIn", "FocusOut", "GlobalSetOption", "RuntimeError", "PromptIdle",
     "NormalBegin", "NormalEnd", "NormalIdle", "NormalKey", "ModeChange", "RawKey",
     "WinClose", "WinCreate", "WinDisplay", "WinResize", "WinSetOption",
 };

src/scope.cc

@@ -0,0 +1,26 @@
+#include "scope.hh"
+#include "context.hh"
+
+namespace Kakoune
+{
+
+GlobalScope::GlobalScope()
+    : m_option_registry(m_options)
+{
+    options().register_watcher(*this);
+}
+
+GlobalScope::~GlobalScope()
+{
+    options().unregister_watcher(*this);
+}
+
+void GlobalScope::on_option_changed(const Option& option)
+{
+    Context empty_context{Context::EmptyContextFlag{}};
+    hooks().run_hook("GlobalSetOption",
+                     format("{}={}", option.name(), option.get_as_string()),
+                     empty_context);
+}
+
+}

src/scope.hh

@@ -43,14 +43,17 @@ private:
     Highlighters  m_highlighters;
 };
 
-class GlobalScope : public Scope, public Singleton<GlobalScope>
+class GlobalScope : public Scope, public OptionManagerWatcher, public Singleton<GlobalScope>
 {
     public:
-        GlobalScope() : m_option_registry(m_options) {}
+        GlobalScope();
+        ~GlobalScope();
 
         OptionsRegistry& option_registry() { return m_option_registry; }
         const OptionsRegistry& option_registry() const { return m_option_registry; }
     private:
+        void on_option_changed(const Option& option);
+
         OptionsRegistry m_option_registry;
 };