From b1eb7543d411025e287e02ee77d33eaf36326eaf Mon Sep 17 00:00:00 2001
From: Jicheng Lu <103353@smsassist.com>
Date: Tue, 22 Jul 2025 10:26:00 -0500
Subject: [PATCH] add from agent filter

---
 .../BotSharp.Core/Templating/TemplateRender.cs    | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/src/Infrastructure/BotSharp.Core/Templating/TemplateRender.cs b/src/Infrastructure/BotSharp.Core/Templating/TemplateRender.cs
index e2a0d029..2124da16 100644
--- a/src/Infrastructure/BotSharp.Core/Templating/TemplateRender.cs
+++ b/src/Infrastructure/BotSharp.Core/Templating/TemplateRender.cs
@@ -4,6 +4,7 @@ using BotSharp.Abstraction.Templating;
 using BotSharp.Abstraction.Translation.Models;
 using Fluid;
 using Fluid.Ast;
+using Fluid.Values;
 using System.Collections;
 using System.IO;
 using System.Reflection;
@@ -37,6 +38,8 @@ public class TemplateRender : ITemplateRender
         _options.MemberAccessStrategy.Register<UserIdentity>();
         _options.MemberAccessStrategy.Register<TranslationInput>();
 
+        _options.Filters.AddFilter("from_agent", FromAgentFilter);
+
         _parser.RegisterExpressionTag("link", (Expression expression, TextWriter writer, TextEncoder encoder, TemplateContext context) =>
         {
             return RenderTag("link", expression, writer, encoder, context, services);
@@ -99,7 +102,7 @@ public class TemplateRender : ITemplateRender
             value = await context.Model.GetValueAsync(TemplateRenderConstant.RENDER_AGENT, context);
             var agent = value?.ToObjectValue() as Agent;
 
-            var splited = Regex.Split(expStr, @"\s*from\s*", RegexOptions.IgnoreCase | RegexOptions.CultureInvariant)
+            var splited = Regex.Split(expStr, @"\s*from_agent\s*", RegexOptions.IgnoreCase | RegexOptions.CultureInvariant)
                                .Where(x => !string.IsNullOrWhiteSpace(x))
                                .Select(x => x.Trim())
                                .ToArray();
@@ -142,6 +145,16 @@ public class TemplateRender : ITemplateRender
         return Completion.Normal;
     }
 
+    private static ValueTask<FluidValue> FromAgentFilter(
+        FluidValue input,
+        FilterArguments arguments,
+        TemplateContext context)
+    {
+        var inputStr = input?.ToStringValue() ?? string.Empty;
+        var fromAgent = arguments.At(0).ToStringValue();
+        return new StringValue($"{inputStr} from_agent {fromAgent}");
+    }
+
     private static bool IsStringType(Type type)
     {
         return type == typeof(string);