--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/rust/rhg/src/utils/path_utils.rs	Tue Oct 05 18:02:22 2021 +0530
@@ -0,0 +1,48 @@
+// path utils module
+//
+// This software may be used and distributed according to the terms of the
+// GNU General Public License version 2 or any later version.
+
+use crate::error::CommandError;
+use crate::ui::UiError;
+use hg::repo::Repo;
+use hg::utils::current_dir;
+use hg::utils::files::{get_bytes_from_path, relativize_path};
+use hg::utils::hg_path::HgPath;
+use hg::utils::hg_path::HgPathBuf;
+use std::borrow::Cow;
+
+pub fn relativize_paths(
+    repo: &Repo,
+    paths: impl IntoIterator<Item = impl AsRef<HgPath>>,
+    mut callback: impl FnMut(Cow<[u8]>) -> Result<(), UiError>,
+) -> Result<(), CommandError> {
+    let cwd = current_dir()?;
+    let repo_root = repo.working_directory_path();
+    let repo_root = cwd.join(repo_root); // Make it absolute
+    let repo_root_hgpath =
+        HgPathBuf::from(get_bytes_from_path(repo_root.to_owned()));
+    let outside_repo: bool;
+    let cwd_hgpath: HgPathBuf;
+
+    if let Ok(cwd_relative_to_repo) = cwd.strip_prefix(&repo_root) {
+        // The current directory is inside the repo, so we can work with
+        // relative paths
+        outside_repo = false;
+        cwd_hgpath =
+            HgPathBuf::from(get_bytes_from_path(cwd_relative_to_repo));
+    } else {
+        outside_repo = true;
+        cwd_hgpath = HgPathBuf::from(get_bytes_from_path(cwd));
+    }
+
+    for file in paths {
+        if outside_repo {
+            let file = repo_root_hgpath.join(file.as_ref());
+            callback(relativize_path(&file, &cwd_hgpath))?;
+        } else {
+            callback(relativize_path(file.as_ref(), &cwd_hgpath))?;
+        }
+    }
+    Ok(())
+}