1 files changed, 55 insertions, 0 deletions
diff --git a/libs/plugin_python/src/mobase/deprecation.cpp b/libs/plugin_python/src/mobase/deprecation.cpp
new file mode 100644
index 0000000..958712d
--- /dev/null
+++ b/libs/plugin_python/src/mobase/deprecation.cpp
@@ -0,0 +1,55 @@
+#include "deprecation.h"
+
+#include <filesystem>
+#include <set>
+
+#include <pybind11/pybind11.h>
+
+#include <QCoreApplication>
+
+#include <uibase/log.h>
+
+namespace py = pybind11;
+
+namespace mo2::python {
+
+    void show_deprecation_warning(std::string_view name, std::string_view message,
+                                  bool show_once)
+    {
+
+        // Contains the list of filename / line number for which a deprecation
+        // warning has already been shown.
+        static std::set<std::pair<std::string, int>> DeprecatedLines;
+
+        // Find the caller:
+        auto inspect                = py::module_::import("inspect");
+        auto current_frame          = inspect.attr("currentframe")();
+        py::sequence callable_frame = inspect.attr("getouterframes")(current_frame, 2);
+        auto last_frame             = callable_frame[py::int_(-1)];
+        auto filename               = last_frame.attr("filename").cast<std::string>();
+        auto function               = last_frame.attr("function").cast<std::string>();
+        auto lineno                 = last_frame.attr("lineno").cast<int>();
+
+        // Only show once if requested:
+        if (show_once && DeprecatedLines.contains({filename, lineno})) {
+            return;
+        }
+
+        // Register the deprecation:
+        DeprecatedLines.emplace(filename, lineno);
+
+        auto path = relative(std::filesystem::path(filename),
+                             QCoreApplication::applicationDirPath().toStdWString());
+
+        // Show the message:
+        if (message.empty()) {
+            MOBase::log::warn("[deprecated] {} in {} [{}:{}].", name, function,
+                              path.native(), lineno);
+        }
+        else {
+            MOBase::log::warn("[deprecated] {} in {} [{}:{}]: {}", name, function,
+                              path.native(), lineno, message);
+        }
+    }
+
+}  // namespace mo2::python