Update docs for generated files and make expereince a bit smoother

README.md

@@ -232,6 +232,18 @@ By default the project will find all wit files and execute wit-bindgen against e
 </ItemGroup>
 ```
 
+### Configuring location of generaged wit files
+
+By default the wit files are generated under the itermediate path `$(IntermediateOutputPath)wit_bindgen` which is by default at a location like `\obj\Debug\net9.0\wit_bindgen`.  This means you can't really see the files and they will be ignored and not checked in to source by default (assuming you have a standard .net `.gitignore`) but intillisense will work. 
+
+If you would like to have the files in a more discoverable place and potentially check the source files in you can configure the output location with a folder name and location of your choice, for example the following will create a folder `genererated/wit/` at the root of your project and put all the files in there.
+
+```xml
+<PropertyGroup>
+    <WitGeneratedFilesRoot>generated/wit</WitGeneratedFilesRoot>
+</PropertyGroup>
+```
+
 ### Passing additional wit-bindgen args
 
 [wit-bindgen](https://github.com/bytecodealliance/wit-bindgen/tree/main) for c# has some advanced settings that can be set by using `WitBindgenAddtionalArgs` property. A non-exhustive list of example args that might be useful are:

src/WitBindgen/build/BytecodeAlliance.Componentize.DotNet.WitBindgen.targets

@@ -48,7 +48,7 @@
 			Condition="'$(Language)' == 'C#' AND '@(Wit)' != ''"
             DependsOnTargets="PrepareWasmSdks; WitCompile_GetDependencies; WitCompile_InvokeTool">
         <ItemGroup>
-            <Compile Include="$(WitGeneratedFilesRoot)**\*.cs" />
+            <Compile Include="$(WitGeneratedFilesRoot)**\*.cs" KeepDuplicates="false" /> 
         </ItemGroup>
     </Target>
 
@@ -75,6 +75,7 @@
     <Target Name="WitCompile_InvokeTool" Inputs="@(Wit);$(MSBuildProjectFile)" Outputs="@(WitGeneratedCsFiles);$(WitGeneratedFilesRoot)lastbuild.txt">
         <PropertyGroup>
             <WitGeneratedFilesRoot Condition="'$(WitGeneratedFilesRoot)' == ''">$(IntermediateOutputPath)wit_bindgen\</WitGeneratedFilesRoot>
+            <WitGeneratedFilesRoot Condition="'$(WitGeneratedFilesRoot)' != '' AND !$(WitGeneratedFilesRoot.EndsWith('\'))">$(WitGeneratedFilesRoot)\</WitGeneratedFilesRoot>
         </PropertyGroup>
         <ItemGroup>
             <WitGeneratedCsFiles Remove="@(WitGeneratedCsFiles)" />

test/WitBindgenTest/WitBindgenTest/CodeGenerationTest.cs

@@ -1,8 +1,3 @@
-using MyFuncsWorld;
-using ProducerWorld;
-using MyResultsWorld;
-using MyWitResultsWorld;
-using System;
 using Xunit;
 
 namespace WitBindgenTest;
@@ -47,4 +42,10 @@ public void ShouldBeNormalWitResult()
     {
         Assert.NotNull((Func<float, MyWitResultsWorld.Result<float, string>>)MyWitResultsWorldImpl.StringError);
     }
+
+    [Fact]
+    public void CanChangeWitouputLocation()
+    {
+         Assert.NotNull((Func<int>)MySimpleWorldImpl.GetNumber);
+    }
 }

test/WitBindgenTest/WitBindgenTest/WitBindgenTest.csproj

@@ -22,6 +22,7 @@
     <ProjectReference Include="..\testapps\LibraryUsingWit\LibraryUsingWit.csproj" />
     <ProjectReference Include="..\testapps\LibraryWithExceptions\LibraryWitExceptions.csproj" />
     <ProjectReference Include="..\testapps\LibraryWithWitResultType\LibraryWithWitResultType.csproj" />
+    <ProjectReference Include="..\testapps\LibraryWithCustomGeneratedFilesLocation\LibraryWithCustomGeneratedFilesLocation.csproj" />
   </ItemGroup>
 
 </Project>

test/WitBindgenTest/testapps/LibraryWithCustomGeneratedFilesLocation/Code.cs

@@ -0,0 +1,9 @@
+using MySimpleWorld;
+
+public class MySimpleWorldImpl : IMySimpleWorld
+{
+    public static int GetNumber()
+    {
+        return 123;
+    }
+}

test/WitBindgenTest/testapps/LibraryWithCustomGeneratedFilesLocation/LibraryWithCustomGeneratedFilesLocation.csproj

@@ -0,0 +1,21 @@
+<Project Sdk="Microsoft.NET.Sdk">
+    <!-- Only needed when referencing the dependencies as projects. For package references, these are imported automatically. -->
+    <Import Project="..\..\..\..\src\WitBindgen\ImportInDev.proj" />
+
+    <PropertyGroup>
+        <TargetFramework>net9.0</TargetFramework>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+        <WitGeneratedFilesRoot>generated/wit</WitGeneratedFilesRoot>
+    </PropertyGroup>
+
+    <ItemGroup>
+      <ProjectReference Include="..\..\..\..\src\WitBindgen\WitBindgen.csproj" />
+      <PackageReference Include="runtime.$(NETCoreSdkPortableRuntimeIdentifier).Microsoft.DotNet.ILCompiler.LLVM"/>
+    </ItemGroup>
+
+    <ItemGroup>
+      <Wit Update="result.wit" />
+    </ItemGroup>
+
+</Project>

test/WitBindgenTest/testapps/LibraryWithCustomGeneratedFilesLocation/generated/wit/MySimple.cs

@@ -0,0 +1,89 @@
+// Generated by `wit-bindgen` 0.40.0. DO NOT EDIT!
+// <auto-generated />
+#nullable enable
+using System.Runtime.InteropServices;
+namespace MySimpleWorld {
+
+    public interface IMySimpleWorld {
+        static abstract int GetNumber();
+
+    }
+
+    public readonly struct None {}
+
+    [StructLayout(LayoutKind.Sequential)]
+    public readonly struct Result<TOk, TErr>
+    {
+        public readonly byte Tag;
+        private readonly object value;
+
+        private Result(byte tag, object value)
+        {
+            Tag = tag;
+            this.value = value;
+        }
+
+        public static Result<TOk, TErr> Ok(TOk ok)
+        {
+            return new Result<TOk, TErr>(Tags.Ok, ok!);
+        }
+
+        public static Result<TOk, TErr> Err(TErr err)
+        {
+            return new Result<TOk, TErr>(Tags.Err, err!);
+        }
+
+        public bool IsOk => Tag == Tags.Ok;
+        public bool IsErr => Tag == Tags.Err;
+
+        public TOk AsOk
+        {
+            get
+            {
+                if (Tag == Tags.Ok)
+                {
+                    return (TOk)value;
+                }
+
+                throw new ArgumentException("expected k, got " + Tag);
+            }
+        }
+
+        public TErr AsErr
+        {
+            get
+            {
+                if (Tag == Tags.Err)
+                {
+                    return (TErr)value;
+                }
+
+                throw new ArgumentException("expected Err, got " + Tag);
+            }
+        }
+
+        public class Tags
+        {
+            public const byte Ok = 0;
+            public const byte Err = 1;
+        }
+    }
+
+    namespace exports {
+        using System.Runtime.InteropServices;
+        public static class MySimpleWorld
+        {
+
+            [UnmanagedCallersOnly(EntryPoint = "get-number")]
+            public static unsafe int wasmExportGetNumber() {
+
+                int ret;
+                ret = MySimpleWorldImpl.GetNumber();
+                return ret;
+
+            }
+
+        }
+    }
+
+}

test/WitBindgenTest/testapps/LibraryWithCustomGeneratedFilesLocation/generated/wit/MySimpleWorld_component_type.wit

@@ -0,0 +1,5 @@
+package test:simple;
+
+world my-simple {
+  export get-number: func() -> s32;
+}

test/WitBindgenTest/testapps/LibraryWithCustomGeneratedFilesLocation/generated/wit/MySimpleWorld_wasm_import_linkage_attribute.cs

@@ -0,0 +1,11 @@
+// Generated by `wit-bindgen` 0.40.0. DO NOT EDIT!
+// <auto-generated />
+#nullable enable
+
+#if !NET9_0_OR_GREATER
+// temporarily add this attribute until it is available in dotnet 9
+namespace System.Runtime.InteropServices
+{
+    internal partial class WasmImportLinkageAttribute : Attribute {}
+}
+#endif

test/WitBindgenTest/testapps/LibraryWithCustomGeneratedFilesLocation/simple.wit

@@ -0,0 +1,5 @@
+package test:simple;
+
+world my-simple {
+  export get-number: func() -> s32;
+}