Update following onModStateChanged + Depreciation warning.

src/runner/pythonutils.cpp

@@ -0,0 +1,46 @@
+#include "pythonutils.h"
+
+#include <filesystem>
+#include <set>
+
+#include <QCoreApplication>
+
+#include "log.h"
+
+// Contains the list of filename / line number for which a depreciation warning has already been shown.
+static std::set<std::pair<std::string, int>> g_DeprecatedLines;
+
+namespace utils {
+
+  void show_depreciation_warning(std::string_view name, std::string_view message, bool show_once) {
+    
+    // Find the caller:
+    auto inspect = bpy::import("inspect");
+    auto current_frame = inspect.attr("currentframe")();
+    auto callable_frame = inspect.attr("getouterframes")(current_frame, 2);
+    auto filename = bpy::extract<std::string>(callable_frame[-1].attr("filename"))();
+    auto function = bpy::extract<std::string>(callable_frame[-1].attr("function"))();
+    auto lineno = bpy::extract<int>(callable_frame[-1].attr("lineno"));
+
+    // Only show once if requested:
+    if (show_once && g_DeprecatedLines.contains({ filename, lineno })) {
+      return;
+    }
+
+    // Register the depreciation:
+    g_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);
+    }
+  }
+
+}