From b2efaa856ad06c13c4721699133441bb1af8b060 Mon Sep 17 00:00:00 2001
From: xtqqczze <45661989+xtqqczze@users.noreply.github.com>
Date: Mon, 19 Dec 2022 13:48:31 +0000
Subject: [PATCH 1/3] Refactor `MUIFileSearcher.AddFiles`

---
 .../help/MUIFileSearcher.cs                   | 51 ++++---------------
 1 file changed, 9 insertions(+), 42 deletions(-)

diff --git a/src/System.Management.Automation/help/MUIFileSearcher.cs b/src/System.Management.Automation/help/MUIFileSearcher.cs
index 1873a341c42..7d950785483 100644
--- a/src/System.Management.Automation/help/MUIFileSearcher.cs
+++ b/src/System.Management.Automation/help/MUIFileSearcher.cs
@@ -57,6 +57,14 @@ private MUIFileSearcher(string target, Collection<string> searchPaths)
         /// </summary>
         internal SearchMode SearchMode { get; } = SearchMode.Unique;
 
+        private static EnumerationOptions _enumerationOptions = new()
+        {
+            IgnoreInaccessible = false,
+            AttributesToSkip = 0,
+            MatchType = MatchType.Win32,
+            MatchCasing = MatchCasing.CaseInsensitive,
+        };
+
         private Collection<string> _result = null;
 
         /// <summary>
@@ -113,52 +121,11 @@ private void SearchForFiles()
             }
         }
 
-        private static string[] GetFiles(string path, string pattern)
-        {
-#if UNIX
-            // On Linux, file names are case sensitive, so we need to add
-            // extra logic to select the files that match the given pattern.
-            var result = new List<string>();
-            string[] files = Directory.GetFiles(path);
-
-            var wildcardPattern = WildcardPattern.ContainsWildcardCharacters(pattern)
-                ? WildcardPattern.Get(pattern, WildcardOptions.IgnoreCase)
-                : null;
-
-            foreach (string filePath in files)
-            {
-                if (filePath.Contains(pattern, StringComparison.OrdinalIgnoreCase))
-                {
-                    result.Add(filePath);
-                    break;
-                }
-
-                if (wildcardPattern != null)
-                {
-                    string fileName = Path.GetFileName(filePath);
-                    if (wildcardPattern.IsMatch(fileName))
-                    {
-                        result.Add(filePath);
-                    }
-                }
-            }
-
-            return result.ToArray();
-#else
-            return Directory.GetFiles(path, pattern);
-#endif
-        }
-
         private void AddFiles(string muiDirectory, string directory, string pattern)
         {
             if (Directory.Exists(muiDirectory))
             {
-                string[] files = GetFiles(muiDirectory, pattern);
-
-                if (files == null)
-                    return;
-
-                foreach (string file in files)
+                foreach (string file in Directory.EnumerateFiles(muiDirectory, pattern, _enumerationOptions))
                 {
                     string path = Path.Combine(muiDirectory, file);
 

From 986cc7fb5757ed4b736138b78b20ae3a4ddcb961 Mon Sep 17 00:00:00 2001
From: xtqqczze <45661989+xtqqczze@users.noreply.github.com>
Date: Mon, 19 Dec 2022 18:14:38 +0000
Subject: [PATCH 2/3] fix IDE0044

---
 src/System.Management.Automation/help/MUIFileSearcher.cs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/System.Management.Automation/help/MUIFileSearcher.cs b/src/System.Management.Automation/help/MUIFileSearcher.cs
index 7d950785483..c8fe2057aa3 100644
--- a/src/System.Management.Automation/help/MUIFileSearcher.cs
+++ b/src/System.Management.Automation/help/MUIFileSearcher.cs
@@ -57,7 +57,7 @@ private MUIFileSearcher(string target, Collection<string> searchPaths)
         /// </summary>
         internal SearchMode SearchMode { get; } = SearchMode.Unique;
 
-        private static EnumerationOptions _enumerationOptions = new()
+        private static readonly EnumerationOptions _enumerationOptions = new()
         {
             IgnoreInaccessible = false,
             AttributesToSkip = 0,

From c059fe821dc3284a76ee5b3d2d57f12d87b4b996 Mon Sep 17 00:00:00 2001
From: xtqqczze <45661989+xtqqczze@users.noreply.github.com>
Date: Fri, 23 Dec 2022 15:15:46 +0000
Subject: [PATCH 3/3] fix name clash

---
 src/System.Management.Automation/help/MUIFileSearcher.cs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/System.Management.Automation/help/MUIFileSearcher.cs b/src/System.Management.Automation/help/MUIFileSearcher.cs
index c8fe2057aa3..dd437fa90c0 100644
--- a/src/System.Management.Automation/help/MUIFileSearcher.cs
+++ b/src/System.Management.Automation/help/MUIFileSearcher.cs
@@ -57,7 +57,7 @@ private MUIFileSearcher(string target, Collection<string> searchPaths)
         /// </summary>
         internal SearchMode SearchMode { get; } = SearchMode.Unique;
 
-        private static readonly EnumerationOptions _enumerationOptions = new()
+        private static readonly System.IO.EnumerationOptions _enumerationOptions = new()
         {
             IgnoreInaccessible = false,
             AttributesToSkip = 0,