feat: use go/analysis.Pass.Module

go.mod

@@ -5,6 +5,7 @@ go 1.22.0
 require (
 	github.com/stretchr/testify v1.10.0
 	golang.org/x/mod v0.22.0
+	golang.org/x/tools v0.27.0
 )
 
 require (

go.sum

@@ -6,6 +6,8 @@ github.com/stretchr/testify v1.10.0 h1:Xv5erBjTwe/5IxqUQTdXv5kgmIvbHo3QQyRwhJsOf
 github.com/stretchr/testify v1.10.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
 golang.org/x/mod v0.22.0 h1:D4nJWe9zXqHOmWqj4VMOJhvzj7bEZg4wEYa759z1pH4=
 golang.org/x/mod v0.22.0/go.mod h1:6SkKJ3Xj0I0BrPOZoBy3bdMptDDU9oJrpohJ3eWZ1fY=
+golang.org/x/tools v0.27.0 h1:qEKojBykQkQ4EynWy4S8Weg69NumxKdn40Fce3uc/8o=
+golang.org/x/tools v0.27.0/go.mod h1:sUi0ZgbwW9ZPAq26Ekut+weQPR5eIM6GQLQ1Yjm1H0Q=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=

module.go

@@ -7,8 +7,10 @@ import (
 	"fmt"
 	"os"
 	"os/exec"
+	"path/filepath"
 
 	"golang.org/x/mod/modfile"
+	"golang.org/x/tools/go/analysis"
 )
 
 type modInfo struct {
@@ -20,26 +22,49 @@ type modInfo struct {
 }
 
 // GetModuleFile gets module file.
+// It's better to use [GetGoModFile] instead of this function.
 func GetModuleFile() (*modfile.File, error) {
+	goMod, err := getModulePath()
+	if err != nil {
+		return nil, err
+	}
+
+	if goMod == "" {
+		return nil, errors.New("working directory is not part of a module")
+	}
+
+	return parseGoMod(goMod)
+}
+
+// GetGoModFile gets module file.
+func GetGoModFile(pass *analysis.Pass) (*modfile.File, error) {
+	if pass.Module != nil && pass.Module.Path != "" {
+		return parseGoMod(pass.Module.Path)
+	}
+
+	return GetModuleFile()
+}
+
+func getModulePath() (string, error) {
 	// https://github.com/golang/go/issues/44753#issuecomment-790089020
 	cmd := exec.Command("go", "list", "-m", "-json")
 
 	raw, err := cmd.Output()
 	if err != nil {
-		return nil, fmt.Errorf("command go list: %w: %s", err, string(raw))
+		return "", fmt.Errorf("command go list: %w: %s", err, string(raw))
 	}
 
 	var v modInfo
 	err = json.NewDecoder(bytes.NewBuffer(raw)).Decode(&v)
 	if err != nil {
-		return nil, fmt.Errorf("unmarshaling error: %w: %s", err, string(raw))
+		return "", fmt.Errorf("unmarshaling error: %w: %s", err, string(raw))
 	}
 
-	if v.GoMod == "" {
-		return nil, errors.New("working directory is not part of a module")
-	}
+	return v.GoMod, nil
+}
 
-	raw, err = os.ReadFile(v.GoMod)
+func parseGoMod(goMod string) (*modfile.File, error) {
+	raw, err := os.ReadFile(filepath.Clean(goMod))
 	if err != nil {
 		return nil, fmt.Errorf("reading go.mod file: %w", err)
 	}