feat(editor): the work of the editor sessions not committed yet, as it stands: a curve traced on from the end of the diverging track of a switch goes on at its radius with no transition in, or from a straight right at the switch (alignment start_held, fit_going_on), the plan taking an end adjoining R 10 km or more for a straight; the switches and slips laid into curves, slid along them and laid alone on one straight (frame_path, switch slide); the route plan reading curves going on from the tracks adjoining, the kept designs taken or forgotten; the orthophoto and terrain model settings, downloads and layers, the tracks onto the terrain; the curvature of a path in the plan (bezier::plan_curvature); the Polish texts of all of it. Not built as committed

utilities/utilities.cpp

@@ -73,6 +73,24 @@ std::filesystem::path user_config_path(const std::string &filename)
 	return {}; // env var missing → caller falls back to CWD-relative filename
 }
 
+std::filesystem::path user_cache_path(const std::string &filename)
+{
+	namespace fs = std::filesystem;
+#if defined(_WIN32)
+	if (const char *local = std::getenv("LOCALAPPDATA"))
+		return fs::path(local) / "MaSzyna" / "cache" / filename;
+#elif defined(__APPLE__)
+	if (const char *home = std::getenv("HOME"))
+		return fs::path(home) / "Library" / "Caches" / "MaSzyna" / filename;
+#else
+	if (const char *cache = std::getenv("XDG_CACHE_HOME"); cache != nullptr && *cache != '\0')
+		return fs::path(cache) / "MaSzyna" / filename;
+	if (const char *home = std::getenv("HOME"))
+		return fs::path(home) / ".cache" / "MaSzyna" / filename;
+#endif
+	return {};
+}
+
 // zwraca różnicę czasu
 // jeśli pierwsza jest aktualna, a druga rozkładowa, to ujemna oznacza opóżnienie
 // na dłuższą metę trzeba uwzględnić datę, jakby opóżnienia miały przekraczać 12h (towarowych)