History persistence from file

README.md

@@ -71,14 +71,20 @@ _Note: The `(prompt>)` is  optional_
 // Get command history
 ReadLine.GetHistory();
 
-// Add command to history
-ReadLine.AddHistory("dotnet run");
+// Add commands to history
+ReadLine.AddHistory("dotnet run", "git init");
 
-// Clear history
+// Clear all in-memory history
 ReadLine.ClearHistory();
 
-// Disable history
-ReadLine.HistoryEnabled = false;
+// Enable or disable history recording
+ReadLine.HistoryEnabled = true;
+
+// Load history from file
+ReadLine.LoadHistory("history.txt");
+
+// Save history to file
+ReadLine.SaveHistory("history.txt");
 ```
 
 _Note: History information is persisted for an entire application session. Also, calls to `ReadLine.Read()` automatically adds the console input to history_

src/ReadLine/ReadLine.cs

@@ -2,6 +2,7 @@
 using Internal.ReadLine.Abstractions;
 
 using System.Collections.Generic;
+using System.IO;
 
 namespace System
 {
@@ -32,8 +33,11 @@ public static string Read(string prompt = "", string @default = "")
             }
             else
             {
-                if (HistoryEnabled)
-                    _history.Add(text);
+                if (HistoryEnabled && !string.IsNullOrWhiteSpace(text))
+                {
+                    if (_history.Count == 0 || _history[_history.Count - 1] != text)
+                        _history.Add(text);
+                }
             }
 
             return text;
@@ -58,5 +62,25 @@ private static string GetText(KeyHandler keyHandler)
             Console.WriteLine();
             return keyHandler.Text;
         }
+
+        public static void LoadHistory(string filePath)
+        {
+            if (!File.Exists(filePath)) return;
+
+            var lines = File.ReadAllLines(filePath);
+            _history = new List<string>(lines);
+        }
+
+        public static void SaveHistory(string filePath)
+        {
+            try
+            {
+                File.WriteAllLines(filePath, _history);
+            }
+            catch (Exception ex)
+            {
+                Console.Error.WriteLine($"[ReadLine] Failed to save history: {ex.Message}");
+            }
+        }
     }
 }

test/ReadLine.Tests/ReadLineTests.cs

@@ -1,4 +1,5 @@
 using System;
+using System.IO;
 using System.Linq;
 using Xunit;
 
@@ -35,6 +36,25 @@ public void TestGetCorrectHistory()
             Assert.Equal("dotnet run", GetHistory()[1]);
             Assert.Equal("git init", GetHistory()[2]);
         }
+
+        [Fact]
+        public void TestLoadAndSaveHistory()
+        {
+            string path = "test_history.txt";
+            ClearHistory();
+            AddHistory("foo", "bar");
+            SaveHistory(path);
+
+            ClearHistory();
+            Assert.Empty(GetHistory());
+
+            LoadHistory(path);
+            Assert.Equal(2, GetHistory().Count);
+            Assert.Equal("foo", GetHistory()[0]);
+            Assert.Equal("bar", GetHistory()[1]);
+
+            File.Delete(path);
+        }
 
         public void Dispose()
         {