Create relative pathes for saving projects

src/Tools/tim_tool/src/logic/tim/mod.rs

@@ -1,5 +1,6 @@
 pub mod types;
 
+use pathdiff::diff_paths;
 use std::{fs::File, path::PathBuf};
 use slint::{Rgba8Pixel, SharedPixelBuffer};
 use tool_helper::Error;
@@ -132,6 +133,15 @@ impl TIMInfo {
     pub fn get_path(&self) -> std::path::PathBuf {
         self.path.clone()
     }
+
+    pub fn get_path_rel_to(&self, mut reference_path: std::path::PathBuf) -> Result<std::path::PathBuf, Error> {
+        let file_path = self.path.clone();
+
+        reference_path.pop();
+        diff_paths(&file_path, &reference_path).ok_or_else(|| {
+            Error::from_text(format!("Can not create relative path from {} to {}", file_path.to_string_lossy().as_ref(), reference_path.to_string_lossy().as_ref()))
+        })
+    }
 }
 
 #[derive(Clone)]