From 3ff6fcd59b6689cdc21bca4a82dcf4310e1db87e Mon Sep 17 00:00:00 2001
From: diamondburned <diamond@libdb.so>
Date: Tue, 28 May 2024 13:05:48 -0700
Subject: [PATCH 1/2] allow building on Tinygo

This commit adds package internal/tinygostub that contains
stubs for some of the standard library functions that are not
available in Tinygo.

This allows most of the module to be built with Tinygo.
---
 internal/tinygostub/samefile.go             | 10 ++++++++++
 internal/tinygostub/samefile_tinygo_wasm.go | 10 ++++++++++
 interp/test.go                              |  3 ++-
 3 files changed, 22 insertions(+), 1 deletion(-)
 create mode 100644 internal/tinygostub/samefile.go
 create mode 100644 internal/tinygostub/samefile_tinygo_wasm.go

diff --git a/internal/tinygostub/samefile.go b/internal/tinygostub/samefile.go
new file mode 100644
index 00000000..3bbe27ff
--- /dev/null
+++ b/internal/tinygostub/samefile.go
@@ -0,0 +1,10 @@
+//go:build !(tinygo && wasm)
+
+package tinygostub
+
+import "os"
+
+// SameFile calls [os.SameFile].
+func SameFile(fi1, fi2 os.FileInfo) bool {
+	return os.SameFile(fi1, fi2)
+}
diff --git a/internal/tinygostub/samefile_tinygo_wasm.go b/internal/tinygostub/samefile_tinygo_wasm.go
new file mode 100644
index 00000000..13a374be
--- /dev/null
+++ b/internal/tinygostub/samefile_tinygo_wasm.go
@@ -0,0 +1,10 @@
+//go:build tinygo && wasm
+
+package tinygostub
+
+import "os"
+
+// SameFile returns false.
+func SameFile(fi1, fi2 os.FileInfo) bool {
+	return false
+}
diff --git a/interp/test.go b/interp/test.go
index 3f8ffca7..a6f441d6 100644
--- a/interp/test.go
+++ b/interp/test.go
@@ -13,6 +13,7 @@ import (
 	"golang.org/x/term"
 
 	"mvdan.cc/sh/v3/expand"
+	"mvdan.cc/sh/v3/internal/tinygostub"
 	"mvdan.cc/sh/v3/syntax"
 )
 
@@ -88,7 +89,7 @@ func (r *Runner) binTest(ctx context.Context, op syntax.BinTestOperator, x, y st
 		if err1 != nil || err2 != nil {
 			return false
 		}
-		return os.SameFile(info1, info2)
+		return tinygostub.SameFile(info1, info2)
 	case syntax.TsEql:
 		return atoi(x) == atoi(y)
 	case syntax.TsNeq:

From 8693c4502ed315a77843150bc864b681a625f8c6 Mon Sep 17 00:00:00 2001
From: diamondburned <diamond@libdb.so>
Date: Tue, 28 May 2024 13:14:15 -0700
Subject: [PATCH 2/2] add workflow that guarantees Tinygo build

This workflow guarantees that at least these packages build under Tinygo
x86_64 and WASM:

- mvdan.cc/sh/v3/expand
- mvdan.cc/sh/v3/syntax
- mvdan.cc/sh/v3/interp
---
 .github/workflows/test.yml | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 3e2a57dd..b966c65d 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -40,6 +40,34 @@ jobs:
     - name: Test as root, without cgo, and with busybox
       run: docker run -v="$PWD:/pwd" -w=/pwd -e=CGO_ENABLED=0 golang:1.22.0-alpine go test ./...
 
+  test-tinygo:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - name: Install Tinygo
+      uses: acifani/setup-tinygo@v2
+      with:
+        tinygo-version: 0.32.0
+
+    - name: Create temporary main package
+      run: |
+        mkdir _tinygo && cat<<EOF > _tinygo/main.go
+        package main
+
+        import (
+          _ "mvdan.cc/sh/v3/expand"
+          _ "mvdan.cc/sh/v3/interp"
+          _ "mvdan.cc/sh/v3/syntax"
+        )
+
+        func main() {}
+        EOF
+
+    - name: Build with Tinygo natively
+      run: tinygo build -o /dev/null ./_tinygo
+    - name: Build with Tinygo on WASM
+      run: tinygo build -o /dev/null -target wasm ./_tinygo
+
   docker:
     name: Build and test Docker images
     # Only deploy if previous stages pass.