2 files changed, 39 insertions, 0 deletions
diff --git a/modules/mono/utils/path_utils.cpp b/modules/mono/utils/path_utils.cpp
index 20863b1afe..a7bbc75e29 100644
--- a/modules/mono/utils/path_utils.cpp
+++ b/modules/mono/utils/path_utils.cpp
@@ -170,4 +170,41 @@ String join(const String &p_a, const String &p_b, const String &p_c, const Strin
 	return path::join(path::join(path::join(p_a, p_b), p_c), p_d);
 }
 
+String relative_to_impl(const String &p_path, const String &p_relative_to) {
+	// This function assumes arguments are normalized and absolute paths
+
+	if (p_path.begins_with(p_relative_to)) {
+		return p_path.substr(p_relative_to.length() + 1);
+	} else {
+		String base_dir = p_relative_to.get_base_dir();
+
+		if (base_dir.length() <= 2 && (base_dir.empty() || base_dir.ends_with(":")))
+			return p_path;
+
+		return String("..").plus_file(relative_to_impl(p_path, base_dir));
+	}
+}
+
+#ifdef WINDOWS_ENABLED
+String get_drive_letter(const String &p_norm_path) {
+	int idx = p_norm_path.find(":/");
+	if (idx != -1 && idx < p_norm_path.find("/"))
+		return p_norm_path.substr(0, idx + 1);
+	return String();
+}
+#endif
+
+String relative_to(const String &p_path, const String &p_relative_to) {
+	String relative_to_abs_norm = abspath(p_relative_to);
+	String path_abs_norm = abspath(p_path);
+
+#ifdef WINDOWS_ENABLED
+	if (get_drive_letter(relative_to_abs_norm) != get_drive_letter(path_abs_norm)) {
+		return path_abs_norm;
+	}
+#endif
+
+	return relative_to_impl(path_abs_norm, relative_to_abs_norm);
+}
+
 } // namespace path
diff --git a/modules/mono/utils/path_utils.h b/modules/mono/utils/path_utils.h
index ca25bc09f7..7e868d2b5a 100644
--- a/modules/mono/utils/path_utils.h
+++ b/modules/mono/utils/path_utils.h
@@ -57,6 +57,8 @@ String abspath(const String &p_path);
  */
 String realpath(const String &p_path);
 
+String relative_to(const String &p_path, const String &p_relative_to);
+
 } // namespace path
 
 #endif // PATH_UTILS_H