From f54df9fd6d50030beee064bfd1415bad066107d2 Mon Sep 17 00:00:00 2001
From: A Farzat <a@farzat.xyz>
Date: Sat, 20 Jun 2026 16:58:01 +0300
Subject: Extract paths_from_null_separated_bytes to utils

---
 src/util/mod.rs       |  1 +
 src/util/path_list.rs | 52 +++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 53 insertions(+)
 create mode 100644 src/util/path_list.rs

(limited to 'src/util')

diff --git a/src/util/mod.rs b/src/util/mod.rs
index 24ba6fc..eda8605 100644
--- a/src/util/mod.rs
+++ b/src/util/mod.rs
@@ -1,3 +1,4 @@
 pub mod fence;
 pub mod language;
 pub mod path_display;
+pub mod path_list;
diff --git a/src/util/path_list.rs b/src/util/path_list.rs
new file mode 100644
index 0000000..88f43b9
--- /dev/null
+++ b/src/util/path_list.rs
@@ -0,0 +1,52 @@
+//! Null-separated path-list parsing helpers.
+
+use std::{ffi::OsStr, os::unix::ffi::OsStrExt, path::Path};
+
+/// Parses a NUL-separated path list into borrowed paths.
+///
+/// Empty segments are ignored. Returned paths borrow from `bytes`.
+pub fn paths_from_null_separated_bytes(bytes: &[u8]) -> Vec<&Path> {
+    bytes
+        .split(|byte| *byte == 0)
+        .filter(|segment| !segment.is_empty())
+        .map(|segment| Path::new(OsStr::from_bytes(segment)))
+        .collect()
+}
+
+#[cfg(test)]
+mod tests {
+    use std::path::Path;
+
+    use super::paths_from_null_separated_bytes;
+
+    #[test]
+    fn paths_from_null_separated_bytes_returns_empty_list_for_empty_input() {
+        let paths = paths_from_null_separated_bytes(b"");
+
+        assert!(paths.is_empty());
+    }
+
+    #[test]
+    fn paths_from_null_separated_bytes_ignores_empty_segments() {
+        let paths = paths_from_null_separated_bytes(b"\0a.rs\0\0b.rs\0");
+
+        assert_eq!(paths, vec![Path::new("a.rs"), Path::new("b.rs")]);
+    }
+
+    #[test]
+    fn paths_from_null_separated_bytes_accepts_final_path_without_trailing_nul() {
+        let paths = paths_from_null_separated_bytes(b"a.rs\0b.rs");
+
+        assert_eq!(paths, vec![Path::new("a.rs"), Path::new("b.rs")]);
+    }
+
+    #[test]
+    fn paths_from_null_separated_bytes_preserves_order() {
+        let paths = paths_from_null_separated_bytes(b"b.rs\0a.rs\0c.rs\0");
+
+        assert_eq!(
+            paths,
+            vec![Path::new("b.rs"), Path::new("a.rs"), Path::new("c.rs")]
+        );
+    }
+}
-- 
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