From 0c01ab92c1e0222a5e84709bf3dc7de8862550d4 Mon Sep 17 00:00:00 2001
From: Ray <sympatheticfire@gmail.com>
Date: Wed, 27 Oct 2021 02:04:11 +0100
Subject: [PATCH] WIP: file filter pattern

---
 IO/SmartFileSystem.cs | 115 +++++++++++++++++++++++++++++++++++++++++-
 MainForm.Designer.cs  |   2 +-
 MainForm.cs           |   2 +-
 3 files changed, 115 insertions(+), 4 deletions(-)

diff --git a/IO/SmartFileSystem.cs b/IO/SmartFileSystem.cs
index bb37373..bed749f 100644
--- a/IO/SmartFileSystem.cs
+++ b/IO/SmartFileSystem.cs
@@ -11,7 +11,6 @@ namespace RandomFileRunner.IO
     public class SmartFileSystem
     {
 
-
         public static List<string> GetFiles(string path, string pattern)
         {
             List<string> fileList = new List<string>();
@@ -72,6 +71,8 @@ namespace RandomFileRunner.IO
             List<string> directoryList = new List<string>();
             ulong searchCount = 0;
 
+            if (string.IsNullOrWhiteSpace(pattern)) pattern = "*";
+
             directoryList.Add(path);
             searchCount++;
 
@@ -113,8 +114,13 @@ namespace RandomFileRunner.IO
                         callback(null, searchCount, directoryList.Count);
                     }
 
-                    foreach (string item in Directory.EnumerateFiles(directory, pattern, SearchOption.TopDirectoryOnly))
+                    foreach (string item in Directory.EnumerateFiles(directory, "*", SearchOption.TopDirectoryOnly))
                     {
+                        if (!MatchFileSearchPattern(pattern, Path.GetFileName(item)))
+                        {
+                            continue;
+                        }
+
                         if (!IsFileAccessible(item))
                         {
                             continue;
@@ -162,5 +168,110 @@ namespace RandomFileRunner.IO
             return true;
         }
 
+        public static bool MatchFileSearchPattern(string pattern, string subject)
+        {
+            if (pattern.Contains(';'))
+            {
+                string[] parts = pattern.Split(';');
+                for (int i=0; i<parts.Length; i++)
+                {
+                    if (string.IsNullOrWhiteSpace(parts[i]))
+                    {
+                        continue;
+                    }
+
+                    if (MatchWildcard(parts[i].Trim(), subject))
+                    {
+                        return true;
+                    }
+                }
+
+                return false;
+            }
+            else
+            {
+                return MatchWildcard(pattern, subject);
+            }
+        }
+
+        public static bool MatchWildcard(string wildcardPattern, string subject)
+        {
+            if (string.IsNullOrWhiteSpace(wildcardPattern))
+            {
+                return false;
+            }
+
+            Func<string, string, bool> matchPattern = (pattern, subject) =>
+            {
+                string[] parts = pattern.Split('*');
+                if (parts.Length <= 1)
+                {
+                    return subject.Equals(pattern, StringComparison.CurrentCultureIgnoreCase);
+                }
+
+                int pos = 0;
+
+                for (int i = 0; i < parts.Length; i++)
+                {
+                    if (i <= 0)
+                    {
+                        // first
+                        pos = subject.IndexOf(parts[i], pos, StringComparison.CurrentCultureIgnoreCase);
+                        if (pos != 0)
+                        {
+                            return false;
+                        }
+                    }
+                    else if (i >= (parts.Length - 1))
+                    {
+                        // last
+                        if (!subject.EndsWith(parts[i], StringComparison.CurrentCultureIgnoreCase))
+                        {
+                            return false;
+                        }
+                    }
+                    else
+                    {
+                        pos = subject.IndexOf(parts[i], pos, StringComparison.CurrentCultureIgnoreCase);
+                        if (pos < 0)
+                        {
+                            return false;
+                        }
+
+                        pos += parts[i].Length;
+                    }
+                }
+
+                return true;
+            };
+
+            int wildcardCount = wildcardPattern.Count(x => x.Equals('*'));
+            if (wildcardCount <= 0)
+            {
+                return subject.Equals(wildcardPattern, StringComparison.CurrentCultureIgnoreCase);
+            }
+            else if (wildcardCount == 1)
+            {
+                string newWildcardPattern = wildcardPattern.Replace("*", "");
+
+                if (wildcardPattern.StartsWith("*"))
+                {
+                    return subject.EndsWith(newWildcardPattern, StringComparison.CurrentCultureIgnoreCase);
+                }
+                else if (wildcardPattern.EndsWith("*"))
+                {
+                    return subject.StartsWith(newWildcardPattern, StringComparison.CurrentCultureIgnoreCase);
+                }
+                else
+                {
+                    return matchPattern(wildcardPattern, subject);
+                }
+            }
+            else
+            {
+                return matchPattern(wildcardPattern, subject);
+            }
+        }
+
     }
 }
diff --git a/MainForm.Designer.cs b/MainForm.Designer.cs
index 4864909..ac4d541 100644
--- a/MainForm.Designer.cs
+++ b/MainForm.Designer.cs
@@ -451,7 +451,7 @@ namespace RandomFileRunner
             this.Controls.Add(this.pictureBox1);
             this.Icon = ((System.Drawing.Icon)(resources.GetObject("$this.Icon")));
             this.Name = "MainForm";
-            this.Text = "Random File";
+            this.Text = "222";
             ((System.ComponentModel.ISupportInitialize)(this.pictureBox1)).EndInit();
             this.menuStrip1.ResumeLayout(false);
             this.menuStrip1.PerformLayout();
diff --git a/MainForm.cs b/MainForm.cs
index 7db8dee..094d3e9 100644
--- a/MainForm.cs
+++ b/MainForm.cs
@@ -135,7 +135,7 @@ namespace RandomFileRunner
 
                     if (Directory.Exists(item))
                     {
-                        SmartFileSystem.GetFiles(item, "*.txt", SearchDirecory_OnFound);
+                        SmartFileSystem.GetFiles(item, textBox1.Text, SearchDirecory_OnFound);
 
                         ThreadControl.SetText(label2, foundFiles.Count.ToString());