Add debug logging facility

src/libclang/parse_functions.cpp

@@ -74,6 +74,15 @@ std::unique_ptr<cpp_entity> detail::parse_entity(const detail::parse_context& co
                                                  const CXCursor&              cur,
                                                  const CXCursor&              parent_cur) try
 {
+    if (context.logger->is_verbose())
+    {
+        auto message = detail::format("parsing cursor of type '",
+                                      detail::get_cursor_kind_spelling(cur).c_str(), "'");
+        context.logger->log("libclang parser",
+                            diagnostic{std::move(message), detail::make_location(cur),
+                                       severity::debug});
+    }
+
     auto kind = clang_getCursorKind(cur);
     switch (kind)
     {

src/parser.cpp

@@ -15,6 +15,8 @@ bool diagnostic_logger::log(const char* source, const diagnostic& d) const
 {
     if (d.severity == severity::error)
         error_ = true;
+    else if (!verbose_ && d.severity == severity::debug)
+        return false;
     return do_log(source, d);
 }