update

libmarlin/src/utils.rs

@@ -0,0 +1,25 @@
+//! Misc shared helpers.
+
+use std::path::PathBuf;
+
+/// Determine a filesystem root to limit recursive walking on glob scans.
+pub fn determine_scan_root(pattern: &str) -> PathBuf {
+    let first_wild = pattern
+        .find(|c| matches!(c, '*' | '?' | '['))
+        .unwrap_or(pattern.len());
+    let mut root = PathBuf::from(&pattern[..first_wild]);
+
+    while root
+        .as_os_str()
+        .to_string_lossy()
+        .contains(|c| matches!(c, '*' | '?' | '['))
+    {
+        root = root.parent().map(|p| p.to_path_buf()).unwrap_or_default();
+    }
+
+    if root.as_os_str().is_empty() {
+        PathBuf::from(".")
+    } else {
+        root
+    }
+}