added missing Append extensions

Railway.SourceGenerator/EnsureExtensionsExecutor.cs

@@ -7,7 +7,7 @@ using Microsoft.CodeAnalysis;
 
 namespace Just.Railway.SourceGen;
 
-public sealed class EnsureExtensionExecutor : IGeneratorExecutor
+public sealed class EnsureExtensionsExecutor : IGeneratorExecutor
 {
     public void Execute(SourceProductionContext context, Compilation source)
     {
@@ -80,7 +80,7 @@ public sealed class EnsureExtensionExecutor : IGeneratorExecutor
 
         typeOverloads.ForEach(def => sb.AppendLine($$"""
         [PureAttribute]
-        [GeneratedCodeAttribute("{{nameof(EnsureExtensionExecutor)}}", "1.0.0.0")]
+        [GeneratedCodeAttribute("{{nameof(EnsureExtensionsExecutor)}}", "1.0.0.0")]
         public static Ensure<{{def.CollectionType}}> NotEmpty{{def.TemplateDef}}(this in Ensure<{{def.CollectionType}}> ensure, {{errorParameterDecl}})
         {
             return ensure.State switch
@@ -101,7 +101,7 @@ public sealed class EnsureExtensionExecutor : IGeneratorExecutor
 
         sb.AppendLine($$"""
         [PureAttribute]
-        [GeneratedCodeAttribute("{{nameof(EnsureExtensionExecutor)}}", "1.0.0.0")]
+        [GeneratedCodeAttribute("{{nameof(EnsureExtensionsExecutor)}}", "1.0.0.0")]
         public static Ensure<T> NotNull<T>(this in Ensure<T?> ensure, {{errorParameterDecl}})
             where T : struct
         {
@@ -117,7 +117,7 @@ public sealed class EnsureExtensionExecutor : IGeneratorExecutor
         """);
         sb.AppendLine($$"""
         [PureAttribute]
-        [GeneratedCodeAttribute("{{nameof(EnsureExtensionExecutor)}}", "1.0.0.0")]
+        [GeneratedCodeAttribute("{{nameof(EnsureExtensionsExecutor)}}", "1.0.0.0")]
         public static Ensure<T> NotNull<T>(this in Ensure<T?> ensure, {{errorParameterDecl}})
             where T : notnull
         {
@@ -138,7 +138,7 @@ public sealed class EnsureExtensionExecutor : IGeneratorExecutor
         string defaultErrorExpr = "?? Error.New(DefaultErrorType, $\"Value {{{ensure.ValueExpression}}} does not satisfy the requirement.\")";
         sb.AppendLine($$"""
         [PureAttribute]
-        [GeneratedCodeAttribute("{{nameof(EnsureExtensionExecutor)}}", "1.0.0.0")]
+        [GeneratedCodeAttribute("{{nameof(EnsureExtensionsExecutor)}}", "1.0.0.0")]
         public static Ensure<T> Satisfies<T>(this in Ensure<T> ensure, Func<T, bool> requirement, {{errorParameterDecl}})
         {
             return ensure.State switch
@@ -160,7 +160,7 @@ public sealed class EnsureExtensionExecutor : IGeneratorExecutor
     {
         sb.AppendLine($$"""
         [PureAttribute]
-        [GeneratedCodeAttribute("{{nameof(EnsureExtensionExecutor)}}", "1.0.0.0")]
+        [GeneratedCodeAttribute("{{nameof(EnsureExtensionsExecutor)}}", "1.0.0.0")]
         public static async {{taskType}}<Ensure<T>> Satisfies<T>(this {{taskType}}<Ensure<T>> ensureTask, Func<T, bool> requirement, {{errorParameterDecl}})
         {
             var ensure = await ensureTask.ConfigureAwait(false);
@@ -176,7 +176,7 @@ public sealed class EnsureExtensionExecutor : IGeneratorExecutor
         """);
         sb.AppendLine($$"""
         [PureAttribute]
-        [GeneratedCodeAttribute("{{nameof(EnsureExtensionExecutor)}}", "1.0.0.0")]
+        [GeneratedCodeAttribute("{{nameof(EnsureExtensionsExecutor)}}", "1.0.0.0")]
         public static async {{taskType}}<Ensure<T>> Satisfies<T>(this Ensure<T> ensure, Func<T, {{taskType}}<bool>> requirement, {{errorParameterDecl}})
         {
             return ensure.State switch
@@ -191,7 +191,7 @@ public sealed class EnsureExtensionExecutor : IGeneratorExecutor
         """);
         sb.AppendLine($$"""
         [PureAttribute]
-        [GeneratedCodeAttribute("{{nameof(EnsureExtensionExecutor)}}", "1.0.0.0")]
+        [GeneratedCodeAttribute("{{nameof(EnsureExtensionsExecutor)}}", "1.0.0.0")]
         public static async {{taskType}}<Ensure<T>> Satisfies<T>(this {{taskType}}<Ensure<T>> ensureTask, Func<T, {{taskType}}<bool>> requirement, {{errorParameterDecl}})
         {
             var ensure = await ensureTask.ConfigureAwait(false);

Railway.SourceGenerator/ExtensionsMethodGenerator.cs

@@ -19,7 +19,7 @@ public class ExtensionsMethodGenerator : IIncrementalGenerator
         new ResultTapExecutor(),
         new ResultAppendExecutor(),
         new TryExtensionsExecutor(),
-        new EnsureExtensionExecutor(),
+        new EnsureExtensionsExecutor(),
     };
 
     public void Initialize(IncrementalGeneratorInitializationContext context)

Railway.SourceGenerator/ResultAppendExecutor.cs

@@ -200,6 +200,48 @@ internal sealed class ResultAppendExecutor : ResultExtensionsExecutor
         string resultExpandedTypeDef = GenerateResultTypeDef(expandedTemplateArgNames);
         string methodExpandedTemplateDecl = GenerateTemplateDecl(expandedTemplateArgNames);
 
+        sb.AppendLine($$"""
+        [PureAttribute]
+        [GeneratedCodeAttribute("{{nameof(ResultAppendExecutor)}}", "1.0.0.0")]
+        public static async {{taskType}}<{{resultExpandedTypeDef}}> Append{{methodExpandedTemplateDecl}}(this {{taskType}}<{{resultTypeDef}}> resultTask, TNext next)
+        {
+            var result = await resultTask.ConfigureAwait(false);
+            return result.State switch
+            {
+                ResultState.Success => Result.Success({{JoinArguments(resultValueExpansion, "next")}}),
+                ResultState.Error => result.Error!,
+                _ => throw new ResultNotInitializedException(nameof(result))
+            };
+        }
+        """);
+
+        sb.AppendLine($$"""
+        [PureAttribute]
+        [GeneratedCodeAttribute("{{nameof(ResultAppendExecutor)}}", "1.0.0.0")]
+        public static async {{taskType}}<{{resultExpandedTypeDef}}> Append{{methodExpandedTemplateDecl}}(this {{taskType}}<{{resultTypeDef}}> resultTask, Result<TNext> next)
+        {
+            var result = await resultTask.ConfigureAwait(false);
+            if ((result.State & next.State) == ResultState.Bottom)
+            {
+                throw new ResultNotInitializedException(string.Join(';', GetBottom(result.State, next.State)));
+            }
+
+            Error? error = null;
+            if (result.IsFailure)
+            {
+                error += result.Error;
+            }
+            if (next.IsFailure)
+            {
+                error += next.Error;
+            }
+
+            return error is null
+                ? Result.Success({{JoinArguments(resultValueExpansion, "next.Value")}})
+                : error;
+        }
+        """);
+
         sb.AppendLine($$"""
         [PureAttribute]
         [GeneratedCodeAttribute("{{nameof(ResultAppendExecutor)}}", "1.0.0.0")]