fix cyclic dependency with go modules

pkg/moq/moq.go

@@ -4,10 +4,7 @@ import (
 	"bytes"
 	"errors"
 	"fmt"
-	"go/ast"
 	"go/format"
-	"go/parser"
-	"go/token"
 	"go/types"
 	"io"
 	"os"
@@ -64,10 +61,8 @@ var golintInitialisms = []string{
 
 // Mocker can generate mock structs.
 type Mocker struct {
-	src     string
+	srcPkg  *packages.Package
 	tmpl    *template.Template
-	fset    *token.FileSet
-	pkgs    map[string]*ast.Package
 	pkgName string
 	pkgPath string
 
@@ -76,31 +71,24 @@ type Mocker struct {
 
 // New makes a new Mocker for the specified package directory.
 func New(src, packageName string) (*Mocker, error) {
-	fset := token.NewFileSet()
-	noTestFiles := func(i os.FileInfo) bool {
-		return !strings.HasSuffix(i.Name(), "_test.go")
-	}
-	wd, err := os.Getwd()
+	srcPkg, err := pkgInfoFromPath(src, packages.LoadSyntax)
 	if err != nil {
-		return nil, fmt.Errorf("failed to determin current working directory: %s", err)
+		return nil, fmt.Errorf("Couldn't load source package: %s", err)
 	}
-	packagePath := stripGopath(filepath.Join(wd, src, packageName))
+	pkgPath := srcPkg.PkgPath
 
-	pkgs, err := parser.ParseDir(fset, src, noTestFiles, parser.SpuriousErrors)
+	if len(packageName) == 0 {
+		packageName = srcPkg.Name
+	} else {
+		mockPkgPath := filepath.Join(src, packageName)
+		if _, err := os.Stat(mockPkgPath); os.IsNotExist(err) {
+			os.Mkdir(mockPkgPath, os.ModePerm)
+		}
+		mockPkg, err := pkgInfoFromPath(mockPkgPath, packages.LoadFiles)
 		if err != nil {
-		return nil, err
+			return nil, fmt.Errorf("Couldn't load mock package: %s", err)
 		}
-	if len(packageName) == 0 {
-		for pkgName := range pkgs {
-			if strings.Contains(pkgName, "_test") {
-				continue
-			}
-			packageName = pkgName
-			break
-		}
-	}
-	if len(packageName) == 0 {
-		return nil, errors.New("failed to determine package name")
+		pkgPath = mockPkg.PkgPath
 	}
 
 	tmpl, err := template.New("moq").Funcs(templateFuncs).Parse(moqTemplate)
@@ -108,12 +96,10 @@ func New(src, packageName string) (*Mocker, error) {
 		return nil, err
 	}
 	return &Mocker{
-		src:     src,
 		tmpl:    tmpl,
-		fset:    fset,
-		pkgs:    pkgs,
+		srcPkg:  srcPkg,
 		pkgName: packageName,
-		pkgPath: packagePath,
+		pkgPath: pkgPath,
 		imports: make(map[string]bool),
 	}, nil
 }
@@ -124,11 +110,6 @@ func (m *Mocker) Mock(w io.Writer, name ...string) error {
 		return errors.New("must specify one interface")
 	}
 
-	pkgInfo, err := pkgInfoFromPath(m.src)
-	if err != nil {
-		return err
-	}
-
 	doc := doc{
 		PackageName: m.pkgName,
 		Imports:     moqImports,
@@ -136,7 +117,7 @@ func (m *Mocker) Mock(w io.Writer, name ...string) error {
 
 	mocksMethods := false
 
-	tpkg := pkgInfo.Types
+	tpkg := m.srcPkg.Types
 	for _, n := range name {
 		iface := tpkg.Scope().Lookup(n)
 		if iface == nil {
@@ -177,7 +158,7 @@ func (m *Mocker) Mock(w io.Writer, name ...string) error {
 	}
 
 	var buf bytes.Buffer
-	err = m.tmpl.Execute(&buf, doc)
+	err := m.tmpl.Execute(&buf, doc)
 	if err != nil {
 		return err
 	}
@@ -228,23 +209,15 @@ func (m *Mocker) extractArgs(sig *types.Signature, list *types.Tuple, nameFormat
 	return params
 }
 
-func pkgInfoFromPath(src string) (*packages.Package, error) {
-	abs, err := filepath.Abs(src)
-	if err != nil {
-		return nil, err
-	}
-	pkgFull := stripGopath(abs)
-
+func pkgInfoFromPath(src string, mode packages.LoadMode) (*packages.Package, error) {
 	conf := packages.Config{
-		Mode: packages.LoadSyntax,
+		Mode: mode,
 		Dir:  src,
 	}
-
-	pkgs, err := packages.Load(&conf, pkgFull)
+	pkgs, err := packages.Load(&conf)
 	if err != nil {
 		return nil, err
 	}
-
 	if len(pkgs) == 0 {
 		return nil, errors.New("No packages found")
 	}

pkg/moq/moq_modules_test.go

@@ -0,0 +1,129 @@
+// +build go1.11
+
+package moq
+
+import (
+	"bytes"
+	"io"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+)
+
+// copy copies srcPath to destPath, dirs and files
+func copy(srcPath, destPath string, item os.FileInfo) error {
+	if item.IsDir() {
+		if err := os.MkdirAll(destPath, os.FileMode(0755)); err != nil {
+			return err
+		}
+		items, err := ioutil.ReadDir(srcPath)
+		if err != nil {
+			return err
+		}
+		for _, item := range items {
+			src := filepath.Join(srcPath, item.Name())
+			dest := filepath.Join(destPath, item.Name())
+			if err := copy(src, dest, item); err != nil {
+				return err
+			}
+		}
+	} else {
+		src, err := os.Open(srcPath)
+		if err != nil {
+			return err
+		}
+		defer src.Close()
+
+		dest, err := os.Create(destPath)
+		if err != nil {
+			return err
+		}
+		defer dest.Close()
+
+		_, err = io.Copy(dest, src)
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// copyTestPackage copies test package to a temporary directory
+func copyTestPackage(srcPath string) (string, error) {
+	tmpDir, err := ioutil.TempDir("", "moq-tests")
+	if err != nil {
+		return "", err
+	}
+
+	info, err := os.Lstat(srcPath)
+	if err != nil {
+		return tmpDir, err
+	}
+	return tmpDir, copy(srcPath, tmpDir, info)
+}
+
+func TestModulesSamePackage(t *testing.T) {
+	tmpDir, err := copyTestPackage("testpackages/modules")
+	defer os.RemoveAll(tmpDir)
+	if err != nil {
+		t.Fatalf("Test package copy error: %s", err)
+	}
+
+	m, err := New(tmpDir, "")
+	if err != nil {
+		t.Fatalf("moq.New: %s", err)
+	}
+	var buf bytes.Buffer
+	err = m.Mock(&buf, "Foo")
+	if err != nil {
+		t.Errorf("m.Mock: %s", err)
+	}
+	s := buf.String()
+	if strings.Contains(s, `github.com/matryer/modules`) {
+		t.Errorf("should not have cyclic dependency")
+	}
+	// assertions of things that should be mentioned
+	var strs = []string{
+		"package simple",
+		"var _ Foo = &FooMock{}",
+		"type FooMock struct",
+	}
+	for _, str := range strs {
+		if !strings.Contains(s, str) {
+			t.Errorf("expected but missing: \"%s\"", str)
+		}
+	}
+}
+func TestModulesNestedPackage(t *testing.T) {
+	tmpDir, err := copyTestPackage("testpackages/modules")
+	defer os.RemoveAll(tmpDir)
+	if err != nil {
+		t.Fatalf("Test package copy error: %s", err)
+	}
+
+	m, err := New(tmpDir, "nested")
+	if err != nil {
+		t.Fatalf("moq.New: %s", err)
+	}
+	var buf bytes.Buffer
+	err = m.Mock(&buf, "Foo")
+	if err != nil {
+		t.Errorf("m.Mock: %s", err)
+	}
+	s := buf.String()
+	// assertions of things that should be mentioned
+	var strs = []string{
+		"package nested",
+		"github.com/matryer/modules",
+		"var _ simple.Foo = &FooMock{}",
+		"type FooMock struct",
+		"func (mock *FooMock) FooIt(bar *simple.Bar) {",
+	}
+	for _, str := range strs {
+		if !strings.Contains(s, str) {
+			t.Errorf("expected but missing: \"%s\"", str)
+		}
+	}
+}

pkg/moq/testpackages/modules/go.mod

@@ -0,0 +1 @@
+module github.com/matryer/modules

pkg/moq/testpackages/modules/simple.go

@@ -0,0 +1,7 @@
+package simple
+
+type Foo interface {
+	FooIt(bar *Bar)
+}
+
+type Bar struct{}