From bf4cf561cae801ab49ca74ac69e733a88ea77bce Mon Sep 17 00:00:00 2001
From: Kevin <quebin31@gmail.com>
Date: Wed, 11 Mar 2020 23:05:12 -0500
Subject: [PATCH] Utility function to detect hidden folders. Implemented for
 Unix and Windows.

---
 crates/nu-cli/src/shell/filesystem_shell.rs | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/crates/nu-cli/src/shell/filesystem_shell.rs b/crates/nu-cli/src/shell/filesystem_shell.rs
index bfe7cec53..22ff18408 100644
--- a/crates/nu-cli/src/shell/filesystem_shell.rs
+++ b/crates/nu-cli/src/shell/filesystem_shell.rs
@@ -9,6 +9,7 @@ use crate::prelude::*;
 use crate::shell::completer::NuCompleter;
 use crate::shell::shell::Shell;
 use crate::utils::FileStructure;
+use cfg_if::cfg_if;
 use nu_errors::ShellError;
 use nu_parser::ExpandContext;
 use nu_protocol::{Primitive, ReturnSuccess, UntaggedValue};
@@ -1135,3 +1136,23 @@ fn is_dir_empty(d: &PathBuf) -> bool {
         Ok(mut s) => s.next().is_none(),
     }
 }
+
+fn is_hidden_dir(dir: impl AsRef<Path>) -> bool {
+    cfg_if! {
+        if #[cfg(unix)] {
+            dir.as_ref().starts_with(".")
+        } else if #[cfg(windows)] {
+            use std::os::windows::fs::MetadataExt;
+
+            if let Ok(metadata) = dir.as_ref().metadata() {
+                let attributes = metadata.file_attributes();
+                // https://docs.microsoft.com/en-us/windows/win32/fileio/file-attribute-constants
+                attributes & 0x2
+            } else {
+                false
+            }
+        } else {
+            false
+        }
+    }
+}