More refactoring in prep for a real design.

watcher.hpp

@@ -0,0 +1,20 @@
+#pragma once
+#include <efsw/efsw.hpp>
+#include <git2.h>
+#include <string>                  // for operator+, to_string
+
+class UpdateListener : public efsw::FileWatchListener {
+  public:
+    bool changes = false;
+    git_repository* repo = nullptr;
+
+    UpdateListener(git_repository *r) : repo(r) {};
+
+    void handleFileAction(efsw::WatchID watchid,
+        const std::string& dir,
+        const std::string& filename,
+        efsw::Action action,
+        std::string oldFilename) override;
+
+    void reset_state();
+};