1 files changed, 43 insertions, 0 deletions
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..0d7a010
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,43 @@
+use std::path::{Path, PathBuf};
+
+#[derive(Debug)]
+pub enum NormalizeError {
+    EmptyInput,
+}
+
+pub fn normalize_path(
+    _root: &Path,
+    _origin: &Path,
+    input: &Path,
+) -> Result<PathBuf, NormalizeError> {
+    if input.as_os_str().is_empty() {
+        return Err(NormalizeError::EmptyInput);
+    }
+    Ok(input.to_path_buf())
+}
+
+#[cfg(test)]
+mod tests {
+    use std::path::Path;
+
+    use super::{NormalizeError, normalize_path};
+
+    #[test]
+    fn empty_path_returns_error() {
+        let root = Path::new("/project");
+        let origin_dir = Path::new("/project");
+        let input = Path::new("");
+        let result = normalize_path(root, origin_dir, input);
+        assert!(matches!(result, Err(NormalizeError::EmptyInput)));
+    }
+
+    #[test]
+    fn plain_filename_with_root_at_cwd_returns_filename() {
+        let root = Path::new("/project");
+        let origin_dir = Path::new("/project");
+        let input = Path::new("main.rs");
+        let result = normalize_path(root, origin_dir, input);
+        assert!(result.is_ok());
+        assert_eq!(result.unwrap(), Path::new("main.rs"));
+    }
+}