From 2916245115648f8cdf1b45b5db8dcb0c2267edbf Mon Sep 17 00:00:00 2001
From: Marc Nuri <marc@marcnuri.com>
Date: Thu, 23 Jan 2025 15:56:33 +0100
Subject: [PATCH] feat(wasi): initial wasi compilation

---
 .gitignore          |  1 +
 Makefile            |  9 ++++++
 native/wasm/main.go | 72 +++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 82 insertions(+)
 create mode 100644 native/wasm/main.go

diff --git a/.gitignore b/.gitignore
index 849708fc..e094e31d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,6 +7,7 @@ target/
 *.so
 *.dylib
 *.h
+*.wasm
 
 *.test
 
diff --git a/Makefile b/Makefile
index 9c885bf7..55b8b99b 100644
--- a/Makefile
+++ b/Makefile
@@ -42,6 +42,15 @@ build-native-cross-platform:
 	go install src.techknowlogick.com/xgo@latest
 	xgo $(COMMON_BUILD_ARGS) -out native/out/helm --targets */arm64,*/amd64 ./native
 
+.PHONY: build-native-wasi
+build-native-wasi:
+	#cd native && GOOS=wasip1 GOARCH=wasm go build -o ./out/helm.wasm ./wasm/main.go
+	# Andrea recommends using TinyGo
+	# Doesn't work, need to find the right combination of ENV variables
+	#cd native && GOOS=wasip1 GOARCH=wasm tinygo build -o ./out/helm.wasm
+	# Working Version:
+	cd native && tinygo build -target=wasi -o ./out/helm.wasm ./wasm/main.go
+
 .PHONY: build-java
 build-java:
 	mvn $(MAVEN_OPTIONS) clean verify
diff --git a/native/wasm/main.go b/native/wasm/main.go
new file mode 100644
index 00000000..3c87fc63
--- /dev/null
+++ b/native/wasm/main.go
@@ -0,0 +1,72 @@
+/*
+ * Copyright 2024 Marc Nuri
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package main
+
+/*
+#include <stdbool.h>
+#include <stdlib.h>
+
+typedef struct {
+	char* out;
+	char* err;
+	char* stdOut;
+	char* stdErr;
+} Result;
+*/
+import "C"
+import (
+	"fmt"
+	"strings"
+	"unsafe"
+)
+
+//export ExportedFunction
+func ExportedFunction() int64 {
+	fmt.Println("Hello")
+	return 0
+}
+
+//export CString
+func CString() *C.char {
+	return C.CString("A C String")
+}
+
+//export CFree
+func CFree(pointer unsafe.Pointer) {
+	C.free(pointer)
+}
+
+//export CExport
+func CExport() *C.Result {
+	return &C.Result{
+		out:    toCString("out-string"),
+		err:    toCString("err-string"),
+		stdOut: toCString("stdOut-string"),
+		stdErr: toCString("stdErr-string"),
+	}
+}
+
+func toCString(str string) *C.char {
+	if len(strings.TrimSpace(str)) == 0 {
+		return nil
+	}
+	return C.CString(str)
+}
+
+// Needed for compilation (only)
+func main() {
+}