make the tool work on Windows, enable tests

The tests required a few last tweaks to work on Windows.

.github/workflows/test.yml

@@ -5,7 +5,7 @@ jobs:
     strategy:
       matrix:
         go-version: [1.13.x]
-        platform: [ubuntu-latest, macos-latest]
+        platform: [ubuntu-latest, macos-latest, windows-latest]
     runs-on: ${{ matrix.platform }}
     steps:
     - name: Install Go

main.go

@@ -21,6 +21,7 @@ import (
 	"os"
 	"os/exec"
 	"path/filepath"
+	"runtime"
 	"strings"
 
 	"golang.org/x/tools/go/ast/astutil"
@@ -125,10 +126,17 @@ func main1() int {
 	}
 
 	_, tool := filepath.Split(args[0])
-	// TODO: trim ".exe" for windows?
+	if runtime.GOOS == "windows" {
+		tool = strings.TrimSuffix(tool, ".exe")
+	}
+	transform, ok := transformFuncs[tool]
+	if !ok {
+		fmt.Fprintf(os.Stderr, "unknown tool: %q", tool)
+		return 1
+	}
 	transformed := args[1:]
 	// log.Println(tool, transformed)
-	if transform := transformFuncs[tool]; transform != nil {
+	if transform != nil {
 		var err error
 		if transformed, err = transform(transformed); err != nil {
 			fmt.Fprintln(os.Stderr, err)
@@ -155,6 +163,23 @@ func main1() int {
 var transformFuncs = map[string]func([]string) ([]string, error){
 	"compile": transformCompile,
 	"link":    transformLink,
+
+	"addr2line": nil,
+	"api":       nil,
+	"asm":       nil,
+	"buildid":   nil,
+	"cgo":       nil,
+	"cover":     nil,
+	"dist":      nil,
+	"doc":       nil,
+	"fix":       nil,
+	"nm":        nil,
+	"objdump":   nil,
+	"pack":      nil,
+	"pprof":     nil,
+	"test2json": nil,
+	"trace":     nil,
+	"vet":       nil,
 }
 
 func transformCompile(args []string) ([]string, error) {

main_test.go

@@ -38,7 +38,7 @@ func TestScripts(t *testing.T) {
 			if runtime.GOOS == "windows" {
 				binfile += ".exe"
 			}
-			if err := os.Symlink(os.Args[0], filepath.Join(bindir, "garble")); err != nil {
+			if err := os.Symlink(os.Args[0], binfile); err != nil {
 				return err
 			}
 			env.Vars = append(env.Vars, fmt.Sprintf("PATH=%s%c%s", bindir, filepath.ListSeparator, os.Getenv("PATH")))

testdata/scripts/basic.txt

@@ -9,7 +9,9 @@ cmp stderr main.stderr
 [!windows] [exec:readelf] stdout '\.symtab'
 
 # The default build includes full non-trimmed paths, as well as our names.
-bingrep main$exe ${WORK@R} 'globalVar' 'globalFunc'
+# Only check $WORK on non-windows, because it's difficult to do it there.
+bingrep main$exe 'globalVar' 'globalFunc'
+[!windows] bingrep main$exe ${WORK@R}
 
 # Check that we fail if the user forgot -trimpath.
 ! exec go build -a -toolexec=garble main.go
@@ -28,11 +30,11 @@ cmp stderr main.stderr
 
 # Finally, check that the 'garble build' shortcut works, and produces the same
 # binary.
-cp main main_old
-rm main
+cp main$exe main_old$exe
+rm main$exe
 garble build main.go
 ! bingrep main$exe 'globalVar'
-bincmp main main_old
+bincmp main$exe main_old$exe
 
 -- main.go --
 package main

testdata/scripts/imports.txt

@@ -5,10 +5,10 @@ cmp stdout main.stdout
 ! bingrep main$exe 'ImportedVar' 'ImportedConst' 'ImportedFunc' 'ImportedType'
 
 # Also check that the binary is reproducible when many imports are involved.
-cp main main_old
-rm main
+cp main$exe main_old$exe
+rm main$exe
 garble build
-bincmp main main_old
+bincmp main$exe main_old$exe
 
 -- go.mod --
 module foo.com/main