Mods: Reject old layout mods & improve errors

src/dusk/data.cpp

@@ -1005,4 +1005,50 @@ Paths initialize_data() {
     };
 }
 
+std::filesystem::path user_home_path() {
+    const char* homePath = SDL_GetUserFolder(SDL_FOLDER_HOME);
+    if (homePath == nullptr || homePath[0] == '\0') {
+        return {};
+    }
+    return std::filesystem::path{reinterpret_cast<const char8_t*>(homePath)};
+}
+
+std::filesystem::path normalized_display_path(const std::filesystem::path& path) {
+    std::error_code ec;
+    auto normalized = std::filesystem::weakly_canonical(path, ec);
+    if (!ec) {
+        return normalized;
+    }
+
+    normalized = std::filesystem::absolute(path, ec);
+    if (!ec) {
+        return normalized.lexically_normal();
+    }
+
+    return path.lexically_normal();
+}
+
+std::string abbreviated_path_string(const std::filesystem::path& path) {
+    const auto homePath = user_home_path();
+    if (path.empty() || homePath.empty()) {
+        return io::fs_path_to_string(path);
+    }
+
+    const auto normalizedPath = normalized_display_path(path);
+    const auto normalizedHome = normalized_display_path(homePath);
+    if (normalizedPath == normalizedHome) {
+        return "~";
+    }
+
+    const auto relativePath = normalizedPath.lexically_relative(normalizedHome);
+    if (!relativePath.empty() && !relativePath.is_absolute()) {
+        const auto it = relativePath.begin();
+        if (it == relativePath.end() || *it != "..") {
+            return io::fs_path_to_string(std::filesystem::path{"~"} / relativePath);
+        }
+    }
+
+    return io::fs_path_to_string(path);
+}
+
 }  // namespace dusk::data