normalize path in add and check if path correspond to deleted object

src/utils/path.rs

@@ -1,8 +1,61 @@
 use std::env;
 use std::fs::canonicalize;
-use std::path::{PathBuf, Path};
+use std::path::{PathBuf, Path, Component};
+
 use crate::global::global::DIR_PATH;
 
+/// Improve the path to try remove and solve .. token.
+/// Taken from https://stackoverflow.com/questions/68231306/stdfscanonicalize-for-files-that-dont-exist
+///
+/// This assumes that `a/b/../c` is `a/c` which might be different from
+/// what the OS would have chosen when b is a link. This is OK
+/// for broot verb arguments but can't be generally used elsewhere
+///
+/// This function ensures a given path ending with '/' still
+/// ends with '/' after normalization.
+pub fn normalize_path<P: AsRef<Path>>(path: P) -> PathBuf {
+    let ends_with_slash = path.as_ref()
+        .to_str()
+        .map_or(false, |s| s.ends_with('/'));
+    let mut normalized = PathBuf::new();
+    for component in path.as_ref().components() {
+        match &component {
+            Component::ParentDir => {
+                if !normalized.pop() {
+                    normalized.push(component);
+                }
+            }
+            _ => {
+                normalized.push(component);
+            }
+        }
+    }
+    if ends_with_slash {
+        normalized.push("");
+    }
+    normalized
+}
+
+pub fn normalize_relative(file: &str) -> Result<String, String> {
+    let current = match current() {
+        Some(p) => p,
+        None => {
+            return Err("cannot find current location".to_owned());
+        }
+    };
+    
+    let p = {
+        let tmp_p = current.join(PathBuf::from(file));
+        normalize_path(tmp_p)
+    };
+
+    let relative_p = match p.strip_prefix(repo_root()) {
+        Ok(p) => p,
+        Err(_) => return Err("is not in a nextsync repo or doesn't exist".to_owned()),
+    };
+    Ok(relative_p.to_str().unwrap().to_owned())
+}
+
 pub fn current() -> Option<PathBuf> {
     let d = DIR_PATH.lock().unwrap();