fix read_lines to better handle errors

src/parser.rs

@@ -39,16 +39,8 @@ pub fn process_files(
 pub fn read_lines(
     file_path: &Path,
 ) -> anyhow::Result<impl Iterator<Item = std::io::Result<String>>, anyhow::Error> {
-    match file_path.try_exists() {
-        Ok(true) => {}
-        Ok(false) => return Err(anyhow::anyhow!("File path needs to exist")),
-        Err(e) => eprintln!("Error checking path: {e}"),
-    }
-
-    let path_string = file_path.to_string_lossy().to_string();
-
-    let file =
-        File::open(file_path).with_context(|| format!("failed to open file: {path_string}"))?;
+    let file = File::open(file_path)
+        .with_context(|| format!("failed to open file: {}", file_path.display()))?;
     let reader = BufReader::new(file);
 
     Ok(reader.lines())