Use x/tools/go/loader to load packages instead of custom importer.

main.go

@@ -2,12 +2,12 @@ package main
 
 import (
 	"bytes"
-	"errors"
 	"flag"
 	"fmt"
 	"io"
 	"io/ioutil"
 	"os"
+	"errors"
 
 	"github.com/matryer/moq/pkg/moq"
 )

pkg/moq/importer.go

@@ -1,186 +0,0 @@
-package moq
-
-// taken from https://github.com/ernesto-jimenez/gogen
-// Copyright (c) 2015 Ernesto Jiménez
-
-import (
-	"fmt"
-	"go/ast"
-	"go/importer"
-	"go/parser"
-	"go/token"
-	"go/types"
-	"io/ioutil"
-	"os"
-	"path"
-	"path/filepath"
-	"strings"
-)
-
-type customImporter struct {
-	source        string
-	imported      map[string]*types.Package
-	base          types.Importer
-	skipTestFiles bool
-}
-
-func (i *customImporter) Import(path string) (*types.Package, error) {
-	var err error
-	if path == "" || path[0] == '.' {
-		path, err = filepath.Abs(filepath.Clean(path))
-		if err != nil {
-			return nil, err
-		}
-		path = stripGopath(path)
-	}
-	if pkg, ok := i.imported[path]; ok {
-		return pkg, nil
-	}
-	pkg, err := i.fsPkg(path)
-	if err != nil {
-		return nil, err
-	}
-	i.imported[path] = pkg
-	return pkg, nil
-}
-
-func gopathDir(source, pkg string) (string, error) {
-	// check vendor directory
-	vendorPath, found := vendorPath(source, pkg)
-	if found {
-		return vendorPath, nil
-	}
-	for _, gopath := range gopaths() {
-		absPath, err := filepath.Abs(path.Join(gopath, "src", pkg))
-		if err != nil {
-			return "", err
-		}
-		if dir, err := os.Stat(absPath); err == nil && dir.IsDir() {
-			return absPath, nil
-		}
-	}
-	return "", fmt.Errorf("%s not in $GOPATH or %s", pkg, path.Join(source, "vendor"))
-}
-
-func vendorPath(source, pkg string) (string, bool) {
-	for {
-		if isGopath(source) {
-			return "", false
-		}
-		var err error
-		source, err = filepath.Abs(source)
-		if err != nil {
-			return "", false
-		}
-		vendorPath, err := filepath.Abs(path.Join(source, "vendor", pkg))
-		if err != nil {
-			return "", false
-		}
-		if dir, err := os.Stat(vendorPath); err == nil && dir.IsDir() {
-			return vendorPath, true
-		}
-		source = filepath.Dir(source)
-	}
-}
-
-func removeGopath(p string) string {
-	for _, gopath := range gopaths() {
-		p = strings.Replace(p, path.Join(gopath, "src")+"/", "", 1)
-	}
-	return p
-}
-
-func gopaths() []string {
-	return strings.Split(os.Getenv("GOPATH"), string(filepath.ListSeparator))
-}
-
-func isGopath(path string) bool {
-	for _, p := range gopaths() {
-		if p == path {
-			return true
-		}
-	}
-	return false
-}
-
-func (i *customImporter) fsPkg(pkg string) (*types.Package, error) {
-	dir, err := gopathDir(i.source, pkg)
-	if err != nil {
-		return importOrErr(i.base, pkg, err)
-	}
-
-	dirFiles, err := ioutil.ReadDir(dir)
-	if err != nil {
-		return importOrErr(i.base, pkg, err)
-	}
-
-	fset := token.NewFileSet()
-	var files []*ast.File
-	for _, fileInfo := range dirFiles {
-		if fileInfo.IsDir() {
-			continue
-		}
-		n := fileInfo.Name()
-		if path.Ext(fileInfo.Name()) != ".go" {
-			continue
-		}
-		if i.skipTestFiles && strings.Contains(fileInfo.Name(), "_test.go") {
-			continue
-		}
-		file := path.Join(dir, n)
-		src, err := ioutil.ReadFile(file)
-		if err != nil {
-			return nil, err
-		}
-		f, err := parser.ParseFile(fset, file, src, 0)
-		if err != nil {
-			return nil, err
-		}
-		files = append(files, f)
-	}
-	conf := types.Config{
-		Importer: i,
-	}
-	p, err := conf.Check(pkg, fset, files, nil)
-
-	if err != nil {
-		return importOrErr(i.base, pkg, err)
-	}
-	return p, nil
-}
-
-func importOrErr(base types.Importer, pkg string, err error) (*types.Package, error) {
-	p, impErr := base.Import(pkg)
-	if impErr != nil {
-		return nil, err
-	}
-	return p, nil
-}
-
-// newImporter returns an importer that will try to import code from gopath before using go/importer.Default and skipping test files
-func newImporter(source string) types.Importer {
-	return &customImporter{
-		source:        source,
-		imported:      make(map[string]*types.Package),
-		base:          importer.Default(),
-		skipTestFiles: true,
-	}
-}
-
-// // DefaultWithTestFiles same as Default but it parses test files too
-// func DefaultWithTestFiles() types.Importer {
-// 	return &customImporter{
-// 		imported:      make(map[string]*types.Package),
-// 		base:          importer.Default(),
-// 		skipTestFiles: false,
-// 	}
-// }
-
-// stripGopath teks the directory to a package and remove the gopath to get the
-// canonical package name.
-func stripGopath(p string) string {
-	for _, gopath := range gopaths() {
-		p = strings.TrimPrefix(p, path.Join(gopath, "src")+"/")
-	}
-	return p
-}

pkg/moq/moq.go

@@ -11,8 +11,12 @@ import (
 	"go/types"
 	"io"
 	"os"
+	"path"
+	"path/filepath"
 	"strings"
 	"text/template"
+
+	"golang.org/x/tools/go/loader"
 )
 
 // This list comes from the golint codebase. Golint will complain about any of
@@ -75,11 +79,13 @@ func New(src, packageName string) (*Mocker, error) {
 	noTestFiles := func(i os.FileInfo) bool {
 		return !strings.HasSuffix(i.Name(), "_test.go")
 	}
+
 	pkgs, err := parser.ParseDir(fset, src, noTestFiles, parser.SpuriousErrors)
 	if err != nil {
 		return nil, err
 	}
 	if len(packageName) == 0 {
+
 		for pkgName := range pkgs {
 			if strings.Contains(pkgName, "_test") {
 				continue
@@ -110,57 +116,56 @@ func (m *Mocker) Mock(w io.Writer, name ...string) error {
 	if len(name) == 0 {
 		return errors.New("must specify one interface")
 	}
+
+	pkgInfo, err := m.pkgInfoFromPath(m.src)
+	if err != nil {
+		return err
+	}
+
 	doc := doc{
 		PackageName: m.pkgName,
 		Imports:     moqImports,
 	}
+
 	mocksMethods := false
-	for _, pkg := range m.pkgs {
+
-		i := 0
+	tpkg := pkgInfo.Pkg
-		files := make([]*ast.File, len(pkg.Files))
+	for _, n := range name {
-		for _, file := range pkg.Files {
+		iface := tpkg.Scope().Lookup(n)
-			files[i] = file
+		if iface == nil {
-			i++
+			return fmt.Errorf("cannot find interface %s", n)
 		}
-		conf := types.Config{Importer: newImporter(m.src)}
+		if !types.IsInterface(iface.Type()) {
-		tpkg, err := conf.Check(m.src, m.fset, files, nil)
+			return fmt.Errorf("%s (%s) not an interface", n, iface.Type().String())
-		if err != nil {
-			return err
 		}
-		for _, n := range name {
+		iiface := iface.Type().Underlying().(*types.Interface).Complete()
-			iface := tpkg.Scope().Lookup(n)
+		obj := obj{
-			if iface == nil {
+			InterfaceName: n,
-				return fmt.Errorf("cannot find interface %s", n)
-			}
-			if !types.IsInterface(iface.Type()) {
-				return fmt.Errorf("%s (%s) not an interface", n, iface.Type().String())
-			}
-			iiface := iface.Type().Underlying().(*types.Interface).Complete()
-			obj := obj{
-				InterfaceName: n,
-			}
-			for i := 0; i < iiface.NumMethods(); i++ {
-				mocksMethods = true
-				meth := iiface.Method(i)
-				sig := meth.Type().(*types.Signature)
-				method := &method{
-					Name: meth.Name(),
-				}
-				obj.Methods = append(obj.Methods, method)
-				method.Params = m.extractArgs(sig, sig.Params(), "in%d")
-				method.Returns = m.extractArgs(sig, sig.Results(), "out%d")
-			}
-			doc.Objects = append(doc.Objects, obj)
 		}
+		for i := 0; i < iiface.NumMethods(); i++ {
+			mocksMethods = true
+			meth := iiface.Method(i)
+			sig := meth.Type().(*types.Signature)
+			method := &method{
+				Name: meth.Name(),
+			}
+			obj.Methods = append(obj.Methods, method)
+			method.Params = m.extractArgs(sig, sig.Params(), "in%d")
+			method.Returns = m.extractArgs(sig, sig.Results(), "out%d")
+		}
+		doc.Objects = append(doc.Objects, obj)
 	}
+
 	if mocksMethods {
 		doc.Imports = append(doc.Imports, "sync")
 	}
+
 	for pkgToImport := range m.imports {
-		doc.Imports = append(doc.Imports, pkgToImport)
+		doc.Imports = append(doc.Imports, stripVendorPath(pkgToImport))
 	}
+
 	var buf bytes.Buffer
-	err := m.tmpl.Execute(&buf, doc)
+	err = m.tmpl.Execute(&buf, doc)
 	if err != nil {
 		return err
 	}
@@ -211,6 +216,32 @@ func (m *Mocker) extractArgs(sig *types.Signature, list *types.Tuple, nameFormat
 	return params
 }
 
+func (*Mocker) pkgInfoFromPath(src string) (*loader.PackageInfo, error) {
+
+	abs, err := filepath.Abs(src)
+	if err != nil {
+		return nil, err
+	}
+	pkgFull := stripGopath(abs)
+
+	conf := loader.Config{
+		ParserMode: parser.SpuriousErrors,
+		Cwd:        src,
+	}
+	conf.Import(pkgFull)
+	lprog, err := conf.Load()
+	if err != nil {
+		return nil, err
+	}
+
+	pkgInfo := lprog.Package(pkgFull)
+	if pkgInfo == nil {
+		return nil, errors.New("package was nil")
+	}
+
+	return pkgInfo, nil
+}
+
 type doc struct {
 	PackageName string
 	Objects     []obj
@@ -291,3 +322,31 @@ var templateFuncs = template.FuncMap{
 		return strings.ToUpper(s[0:1]) + s[1:]
 	},
 }
+
+// stripVendorPath strips the vendor dir prefix from a package path.
+// For example we might encounter an absolute path like
+// github.com/foo/bar/vendor/github.com/pkg/errors which is resolved
+// to github.com/pkg/errors.
+func stripVendorPath(p string) string {
+	parts := strings.Split(p, "/vendor/")
+	if len(parts) == 1 {
+		return p
+	}
+	return strings.TrimLeft(path.Join(parts[1:]...), "/")
+}
+
+// stripGopath takes the directory to a package and remove the gopath to get the
+// canonical package name.
+//
+// taken from https://github.com/ernesto-jimenez/gogen
+// Copyright (c) 2015 Ernesto Jiménez
+func stripGopath(p string) string {
+	for _, gopath := range gopaths() {
+		p = strings.TrimPrefix(p, path.Join(gopath, "src")+"/")
+	}
+	return p
+}
+
+func gopaths() []string {
+	return strings.Split(os.Getenv("GOPATH"), string(filepath.ListSeparator))
+}