Improve tests, version

Signed-off-by: Oliver Eikemeier <eikemeier@fillmore-labs.com>

.github/workflows/test.yml

@@ -18,7 +18,7 @@ jobs:
     runs-on: ubuntu-24.04
     strategy:
       matrix:
-        go: ["1.22", "1.21"]
+        go: ["1.23", "1.22", "1.21"]
     env:
       GOTOOLCHAIN: local
     steps:
@@ -32,9 +32,11 @@ jobs:
       - name: 🧸 golangci-lint
         uses: golangci/golangci-lint-action@v6
         with:
-          version: v1.59.1
+          version: v1.60.1
       - name: 🔨 Test
-        run: go test -coverprofile=cover.out ./...
+        run: |
+          go get -C ./pkg/analyzer/testdata golang.org/x/exp/errors
+          go test -coverprofile=cover.out ./...
       - name: 🧑🏻‍💻 codecov
         uses: codecov/codecov-action@v4
         with:

go.mod

@@ -2,11 +2,11 @@ module fillmore-labs.com/zerolint
 
 go 1.21
 
-toolchain go1.22.5
+toolchain go1.23.0
 
-require golang.org/x/tools v0.23.0
+require golang.org/x/tools v0.24.0
 
 require (
-	golang.org/x/mod v0.19.0 // indirect
-	golang.org/x/sync v0.7.0 // indirect
+	golang.org/x/mod v0.20.0 // indirect
+	golang.org/x/sync v0.8.0 // indirect
 )

go.sum

@@ -1,8 +1,8 @@
 github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
 github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
-golang.org/x/mod v0.19.0 h1:fEdghXQSo20giMthA7cd28ZC+jts4amQ3YMXiP5oMQ8=
-golang.org/x/mod v0.19.0/go.mod h1:hTbmBsO62+eylJbnUtE2MGJUyE7QWk4xUqPFrRgJ+7c=
-golang.org/x/sync v0.7.0 h1:YsImfSBoP9QPYL0xyKJPq0gcaJdG3rInoqxTWbfQu9M=
-golang.org/x/sync v0.7.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
-golang.org/x/tools v0.23.0 h1:SGsXPZ+2l4JsgaCKkx+FQ9YZ5XEtA1GZYuoDjenLjvg=
-golang.org/x/tools v0.23.0/go.mod h1:pnu6ufv6vQkll6szChhK3C3L/ruaIv5eBeztNG8wtsI=
+golang.org/x/mod v0.20.0 h1:utOm6MM3R3dnawAiJgn0y+xvuYRsm1RKM/4giyfDgV0=
+golang.org/x/mod v0.20.0/go.mod h1:hTbmBsO62+eylJbnUtE2MGJUyE7QWk4xUqPFrRgJ+7c=
+golang.org/x/sync v0.8.0 h1:3NFvSEYkUoMifnESzZl15y791HH1qU2xm6eCJU5ZPXQ=
+golang.org/x/sync v0.8.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
+golang.org/x/tools v0.24.0 h1:J1shsA93PJUEVaUSaay7UXAyE8aimq3GW0pjlolpa24=
+golang.org/x/tools v0.24.0/go.mod h1:YhNqVBIfWHdzvTLs0d8LCuMhkKUgSUKldakyV7W/WDQ=

main.go

@@ -45,40 +45,15 @@ func (versionFlag) IsBoolFlag() bool { return true }
 func (versionFlag) Get() any         { return nil }
 func (versionFlag) String() string   { return "" }
 func (versionFlag) Set(_ string) error {
-	progname, err := os.Executable()
-	if err != nil {
-		return err
-	}
+	const progname = "zerolint"
 
-	var goVersion, version, revision, time string
 	if bi, ok := debug.ReadBuildInfo(); ok {
-		goVersion = bi.GoVersion
-		version = bi.Main.Version
-		var modified string
-		for _, s := range bi.Settings {
-			switch s.Key {
-			case "vcs.revision":
-				revision = s.Value
-
-			case "vcs.time":
-				time = s.Value
-
-			case "vcs.modified":
-				modified = s.Value
-			}
-		}
-
-		if len(revision) > 6 { //nolint:mnd
-			revision = revision[:7]
-			if len(modified) > 0 {
-				revision += " (dirty)"
-			}
-		}
+		fmt.Printf("%s version %s build with %s\n",
+			progname, bi.Main.Version, bi.GoVersion)
+	} else {
+		fmt.Printf("%s version (unknown)\n", progname)
 	}
 
-	fmt.Printf("%s version %s build with %s from %s on %s\n",
-		progname, version, goVersion, revision, time)
-
 	os.Exit(0)
 
 	return nil

pkg/analyzer/analyzer_test.go

@@ -28,9 +28,9 @@ func TestAnalyzer(t *testing.T) { //nolint:paralleltest
 	a := analyzer.Analyzer
 
 	analyzer.Basic = true
-	analysistest.Run(t, dir, a, "basic")
+	analysistest.Run(t, dir, a, "go.test/basic")
 
 	analyzer.Basic = false
 	analyzer.Excludes = dir + "/excluded.txt"
-	analysistest.RunWithSuggestedFixes(t, dir, a, "a")
+	analysistest.RunWithSuggestedFixes(t, dir, a, "go.test/a")
 }

pkg/analyzer/testdata/src/a/testdata.go → pkg/analyzer/testdata/a/testdata.go

@@ -19,6 +19,8 @@ package a
 import (
 	"errors"
 	"fmt"
+
+	xerrors "golang.org/x/exp/errors"
 )
 
 type empty struct{}
@@ -49,15 +51,18 @@ func Exported() {
 	var x [0]string
 	var y [0]string
 
-	if errors.Is(nil, ErrOne) {
+	if errors.Is(ErrOne, nil) {
 		fmt.Println("nil")
 	}
 
-	if myErrs.Is(ErrOne, ErrTwo) {
-		fmt.Println("nil")
-	}
+	func() {
+		errors := myErrs
+		if errors.Is(ErrOne, ErrTwo) {
+			fmt.Println("one is two")
+		}
+	}()
 
-	if errors.Is(func() error { // want "comparison of pointer to zero-size variable"
+	if xerrors.Is(func() error { // want "comparison of pointer to zero-size variable"
 		return ErrOne
 	}(), ErrTwo) {
 		fmt.Println("equal")
@@ -116,7 +121,9 @@ func Ptr[T any](v T) *T { return &v }
 
 type greeter [5][5]struct{}
 
-func (g *greeter) String() string { // want "pointer to zero-size type"
+type greeterAlias = *greeter // want "pointer to zero-size type"
+
+func (g greeterAlias) String() string {
 	return "hello, world"
 }
 

pkg/analyzer/testdata/src/a/testdata.go.golden → pkg/analyzer/testdata/a/testdata.go.golden

@@ -19,6 +19,8 @@ package a
 import (
 	"errors"
 	"fmt"
+
+	xerrors "golang.org/x/exp/errors"
 )
 
 type empty struct{}
@@ -49,15 +51,18 @@ func Exported() {
 	var x [0]string
 	var y [0]string
 
-	if errors.Is(nil, ErrOne) {
+	if errors.Is(ErrOne, nil) {
 		fmt.Println("nil")
 	}
 
-	if myErrs.Is(ErrOne, ErrTwo) {
-		fmt.Println("nil")
-	}
+	func() {
+		errors := myErrs
+		if errors.Is(ErrOne, ErrTwo) {
+			fmt.Println("one is two")
+		}
+	}()
 
-	if errors.Is(func() error { // want "comparison of pointer to zero-size variable"
+	if xerrors.Is(func() error { // want "comparison of pointer to zero-size variable"
 		return ErrOne
 	}(), ErrTwo) {
 		fmt.Println("equal")
@@ -116,7 +121,9 @@ func Ptr[T any](v T) *T { return &v }
 
 type greeter [5][5]struct{}
 
-func (g greeter) String() string { // want "pointer to zero-size type"
+type greeterAlias = greeter // want "pointer to zero-size type"
+
+func (g greeterAlias) String() string {
 	return "hello, world"
 }
 

pkg/analyzer/testdata/excluded.txt

@@ -1,2 +1,2 @@
-# zerolint exclusions for a
-a.C
+# zerolint exclusions for go.test/a
+go.test/a.C

pkg/analyzer/testdata/go.mod

@@ -0,0 +1,5 @@
+module go.test
+
+go 1.21
+
+require golang.org/x/exp/errors v0.0.0-20240719175910-8a7402abbf56

pkg/analyzer/testdata/go.sum

@@ -0,0 +1,2 @@
+golang.org/x/exp/errors v0.0.0-20240719175910-8a7402abbf56 h1:wWtjcEP22Momq1fphl8WkZCnFX615H/yPDX494o7PtU=
+golang.org/x/exp/errors v0.0.0-20240719175910-8a7402abbf56/go.mod h1:YgqsNsAu4fTvlab/7uiYK9LJrCIzKg/NiZUIH1/ayqo=

pkg/visitor/binary.go

@@ -26,5 +26,6 @@ func (v Visitor) visitBinary(x *ast.BinaryExpr) bool {
 		return true
 	}
 
+	// X == Y or X != Y
 	return v.visitCmp(x, x.X, x.Y)
 }

pkg/visitor/call.go

@@ -27,41 +27,45 @@ import (
 	"golang.org/x/tools/go/analysis"
 )
 
-func (v Visitor) visitCallBasic(x *ast.CallExpr) bool { // only [errors.Is]
+func (v Visitor) visitCallBasic(x *ast.CallExpr) bool {
 	if len(x.Args) != 2 { //nolint:mnd
 		return true
 	}
 	if s, ok := unwrap(x.Fun).(*ast.SelectorExpr); !ok || !v.isErrorsIs(s) {
 		return true
 	}
 
+	// errors.Is(..., ...)
 	return v.visitCmp(x, x.Args[0], x.Args[1])
 }
 
 func (v Visitor) visitCall(x *ast.CallExpr) bool {
-	tF := v.TypesInfo.Types[x.Fun]
-	if tF.IsType() { // check for type casts
-		return v.visitCast(x, tF.Type)
+	funType := v.TypesInfo.Types[x.Fun]
+	if funType.IsType() { // check for type casts
+		// (T)(...)
+		return v.visitCast(x, funType.Type)
 	}
 
-	switch f := unwrap(x.Fun).(type) {
-	case *ast.SelectorExpr: // check for [errors.Is]
-		if len(x.Args) != 2 || !v.isErrorsIs(f) {
+	switch fun := unwrap(x.Fun).(type) {
+	case *ast.SelectorExpr:
+		if len(x.Args) != 2 || !v.isErrorsIs(fun) {
 			return true
 		}
 
+		// errors.Is(..., ...)
 		return v.visitCmp(x, x.Args[0], x.Args[1])
 
-	case *ast.Ident: // check for [builtin.new]
-		if !tF.IsBuiltin() || f.Name != "new" || len(x.Args) != 1 {
+	case *ast.Ident:
+		if !funType.IsBuiltin() || fun.Name != "new" || len(x.Args) != 1 {
 			return true
 		}
 
-		a := x.Args[0]
-		tA := v.TypesInfo.Types[a].Type
-		if v.isZeroSizeType(tA) {
-			message := fmt.Sprintf("new called on zero-size type %q", tA.String())
-			fixes := makePure(x, a)
+		// new(...)
+		arg := x.Args[0]
+		argType := v.TypesInfo.Types[arg].Type
+		if v.isZeroSizeType(argType) {
+			message := fmt.Sprintf("new called on zero-size type %q", argType)
+			fixes := makePure(x, arg)
 			v.report(x, message, fixes)
 
 			return false
@@ -75,19 +79,20 @@ func (v Visitor) isErrorsIs(f *ast.SelectorExpr) bool {
 	if f.Sel.Name != "Is" {
 		return false
 	}
-	path, ok := v.pkgImportPath(f.X)
 
-	return ok && (path == "errors" || path == "golang.org/x/exp/errors")
-}
+	id, ok := f.X.(*ast.Ident)
+	if !ok {
+		return false
+	}
 
-func (v Visitor) pkgImportPath(x ast.Expr) (path string, ok bool) {
-	if id, ok1 := x.(*ast.Ident); ok1 {
-		if pkg, ok2 := v.TypesInfo.Uses[id].(*types.PkgName); ok2 {
-			return pkg.Imported().Path(), true
-		}
+	pkg, ok := v.TypesInfo.Uses[id].(*types.PkgName)
+	if !ok {
+		return false
 	}
 
-	return "", false
+	path := pkg.Imported().Path()
+
+	return path == "errors" || path == "golang.org/x/exp/errors"
 }
 
 func (v Visitor) visitCast(x *ast.CallExpr, t types.Type) bool {
@@ -96,21 +101,18 @@ func (v Visitor) visitCast(x *ast.CallExpr, t types.Type) bool {
 	}
 
 	p, ok := t.Underlying().(*types.Pointer)
-	if !ok {
+	if !ok || !v.isZeroSizeType(p.Elem()) {
 		return true
 	}
 
-	e := p.Elem()
-	if !v.isZeroSizeType(e) {
-		return true
-	}
+	// (*...)(nil)
+	message := fmt.Sprintf("cast of nil to pointer to zero-size variable of type %q", p.Elem())
 
 	var fixes []analysis.SuggestedFix
 	if s, ok2 := unwrap(x.Fun).(*ast.StarExpr); ok2 {
 		fixes = makePure(x, s.X)
 	}
 
-	message := fmt.Sprintf("cast of nil to pointer to zero-size variable of type %q", e.String())
 	v.report(x, message, fixes)
 
 	return fixes == nil

pkg/visitor/cmp.go

@@ -24,7 +24,7 @@ import (
 
 func (v Visitor) visitCmp(n ast.Node, x, y ast.Expr) bool { //nolint:cyclop
 	var p [2]struct {
-		name          string
+		elem          types.Type
 		isZeroPointer bool
 		isInterface   bool
 	}
@@ -36,29 +36,28 @@ func (v Visitor) visitCmp(n ast.Node, x, y ast.Expr) bool { //nolint:cyclop
 		}
 		switch x := t.Type.Underlying().(type) {
 		case *types.Pointer:
-			e := x.Elem()
-			p[i].name = e.String()
-			p[i].isZeroPointer = v.isZeroSizeType(e)
+			p[i].elem = x.Elem()
+			p[i].isZeroPointer = v.isZeroSizeType(x.Elem())
 
 		case *types.Interface:
-			p[i].name = t.Type.String()
+			p[i].elem = t.Type
 			p[i].isInterface = true
 
 		default:
-			p[i].name = t.Type.String()
+			p[i].elem = t.Type
 		}
 	}
 
 	var message string
 	switch {
 	case p[0].isZeroPointer && p[1].isZeroPointer:
-		message = comparisonMessage(p[0].name, p[1].name)
+		message = comparisonMessage(p[0].elem, p[1].elem)
 
 	case p[0].isZeroPointer:
-		message = comparisonIMessage(p[0].name, p[1].name, p[1].isInterface)
+		message = comparisonIMessage(p[0].elem, p[1].elem, p[1].isInterface)
 
 	case p[1].isZeroPointer:
-		message = comparisonIMessage(p[1].name, p[0].name, p[0].isInterface)
+		message = comparisonIMessage(p[1].elem, p[0].elem, p[0].isInterface)
 
 	default:
 		return true
@@ -69,15 +68,15 @@ func (v Visitor) visitCmp(n ast.Node, x, y ast.Expr) bool { //nolint:cyclop
 	return true
 }
 
-func comparisonMessage(xType, yType string) string {
+func comparisonMessage(xType, yType types.Type) string {
 	if xType == yType {
 		return fmt.Sprintf("comparison of pointers to zero-size variables of type %q", xType)
 	}
 
 	return fmt.Sprintf("comparison of pointers to zero-size variables of types %q and %q", xType, yType)
 }
 
-func comparisonIMessage(zType, withType string, isInterface bool) string {
+func comparisonIMessage(zType, withType types.Type, isInterface bool) string {
 	var isIf string
 	if isInterface {
 		isIf = "interface "