feat: Add commands and functionality to save and load chat sessions.

.gitignore

@@ -2,3 +2,4 @@ bin
 obj
 .vscode
 publish
+.anchor

AppJsonContext.cs

@@ -16,6 +16,8 @@ namespace AnchorCli;
 [JsonSerializable(typeof(ModelsResponse))]
 [JsonSerializable(typeof(ModelInfo))]
 [JsonSerializable(typeof(ModelPricing))]
+[JsonSerializable(typeof(Microsoft.Extensions.AI.ChatMessage))]
+[JsonSerializable(typeof(System.Collections.Generic.List<Microsoft.Extensions.AI.ChatMessage>))]
 [JsonSerializable(typeof(AnchorConfig))]
 [JsonSourceGenerationOptions(
     DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull,

ChatSession.cs

@@ -1,4 +1,5 @@
 using Microsoft.Extensions.AI;
+using System.Text.Json;
 
 namespace AnchorCli;
 
@@ -69,4 +70,38 @@ internal sealed class ChatSession
             yield return update;
         }
     }
+
+    public async Task SaveAsync(string filePath, CancellationToken cancellationToken = default)
+    {
+        // Skip the system message when saving (it will be recreated on load)
+        var messagesToSave = History.Skip(1).ToList();
+        
+        var options = new JsonSerializerOptions
+        {
+            PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
+            WriteIndented = true
+        };
+        
+        var json = JsonSerializer.Serialize(messagesToSave, AppJsonContext.Default.ListChatMessage);
+        await File.WriteAllTextAsync(filePath, json, cancellationToken);
+    }
+
+    public async Task LoadAsync(string filePath, CancellationToken cancellationToken = default)
+    {
+        var json = await File.ReadAllTextAsync(filePath, cancellationToken);
+        
+        var options = new JsonSerializerOptions
+        {
+            PropertyNamingPolicy = JsonNamingPolicy.CamelCase
+        };
+        
+        var messages = JsonSerializer.Deserialize<List<ChatMessage>>(json, AppJsonContext.Default.ListChatMessage)
+            ?? new List<ChatMessage>();
+        
+        // Keep the system message and append loaded messages
+        var systemMessage = History[0];
+        History.Clear();
+        History.Add(systemMessage);
+        History.AddRange(messages);
+    }
 }

Commands/LoadCommand.cs

@@ -0,0 +1,31 @@
+using Spectre.Console;
+
+namespace AnchorCli.Commands;
+
+internal class LoadCommand(ChatSession session) : ICommand
+{
+    public string Name => "load";
+    public string Description => "Load a chat session from a file";
+
+    public async Task ExecuteAsync(string[] args, CancellationToken ct)
+    {
+        string filePath = args.Length > 0 ? args[0] : ".anchor/session.json";
+        
+        if (!File.Exists(filePath))
+        {
+            AnsiConsole.MarkupLine($"[yellow]No session file found at {Markup.Escape(filePath)}[/]");
+            return;
+        }
+
+        try
+        {
+            await session.LoadAsync(filePath, ct);
+            AnsiConsole.MarkupLine($"[green]Session loaded from {Markup.Escape(filePath)}[/]");
+        }
+        catch (Exception ex)
+        {
+            AnsiConsole.MarkupLine($"[red]Failed to load session: {Markup.Escape(ex.Message)}[/]");
+        }
+    }
+}
+

Commands/SaveCommand.cs

@@ -0,0 +1,31 @@
+using Spectre.Console;
+
+namespace AnchorCli.Commands;
+
+internal class SaveCommand(ChatSession session) : ICommand
+{
+    public string Name => "save";
+    public string Description => "Save the current chat session to a file";
+
+    public async Task ExecuteAsync(string[] args, CancellationToken ct)
+    {
+        string filePath = args.Length > 0 ? args[0] : ".anchor/session.json";
+
+        try
+        {
+            var directory = Path.GetDirectoryName(filePath);
+            if (!string.IsNullOrEmpty(directory) && !Directory.Exists(directory))
+            {
+                Directory.CreateDirectory(directory);
+            }
+
+            await session.SaveAsync(filePath, ct);
+            AnsiConsole.MarkupLine($"[green]Session saved to {Markup.Escape(filePath)}[/]");
+        }
+        catch (Exception ex)
+        {
+            AnsiConsole.MarkupLine($"[red]Failed to save session: {Markup.Escape(ex.Message)}[/]");
+        }
+    }
+}
+

Program.cs

@@ -81,13 +81,13 @@ infoTable.AddRow("[grey]CWD[/]", $"[green]{Markup.Escape(Environment.CurrentDire
 
 if (modelInfo?.Pricing != null)
 
-if (modelInfo?.Pricing != null)
+    if (modelInfo?.Pricing != null)
-{
+    {
-    var inM = tokenTracker.InputPrice * 1_000_000m;
+        var inM = tokenTracker.InputPrice * 1_000_000m;
-    var outM = tokenTracker.OutputPrice * 1_000_000m;
+        var outM = tokenTracker.OutputPrice * 1_000_000m;
-    infoTable.AddRow("[grey]Pricing[/]",
+        infoTable.AddRow("[grey]Pricing[/]",
-        $"[yellow]${inM:F2}[/][dim]/M in[/]  [yellow]${outM:F2}[/][dim]/M out[/]");
+            $"[yellow]${inM:F2}[/][dim]/M in[/]  [yellow]${outM:F2}[/][dim]/M out[/]");
-}
+    }
 if (modelInfo != null)
 {
     infoTable.AddRow("[grey]Context[/]",
@@ -110,7 +110,7 @@ var openAiClient = new OpenAIClient(new ApiKeyCredential(apiKey), new OpenAIClie
 IChatClient innerClient = openAiClient.GetChatClient(model).AsIChatClient();
 
 // ── Tool call logging via Spectre ───────────────────────────────────────
-object consoleLock = new object();
+object consoleLock = new();
 
 void ToolLog(string message)
 {
@@ -142,12 +142,38 @@ commandRegistry.Register(new StatusCommand(model, endpoint));
 commandRegistry.Register(new CompactCommand(session.Compactor, session.History));
 commandRegistry.Register(new SetupCommand());
 commandRegistry.Register(new ResetCommand(session, tokenTracker));
+commandRegistry.Register(new SaveCommand(session));
+commandRegistry.Register(new LoadCommand(session));
 
 
 var commandDispatcher = new CommandDispatcher(commandRegistry);
 
 // ── Run Repl ────────────────────────────────────────────────────────────
 
+// Auto-load session if it exists
+const string sessionPath = ".anchor/session.json";
+if (File.Exists(sessionPath))
+{
+    try
+    {
+        await session.LoadAsync(sessionPath, default);
+        AnsiConsole.MarkupLine($"[dim grey]Auto-loaded previous session.[/]");
+    }
+    catch { /* Ignore load errors on startup */ }
+}
+
 var repl = new ReplLoop(session, tokenTracker, commandDispatcher);
 await repl.RunAsync();
 
+// Auto-save session on clean exit
+try
+{
+    var directory = Path.GetDirectoryName(sessionPath);
+    if (!string.IsNullOrEmpty(directory) && !Directory.Exists(directory))
+    {
+        Directory.CreateDirectory(directory);
+    }
+    await session.SaveAsync(sessionPath, default);
+}
+catch { /* Ignore save errors on exit */ }
+