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cmd/stringer: use source importer when available

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This means that running stringer should always
have the intended effect, without having to
go install the package first, which was a common
source of confusion.

The source importer is marginally slower,
but stringer is run infrequently,
and we're only typechecking one package (and fmt),
not an entire tree, as vet does.

Fixes golang/go#10249

Change-Id: Ib8cde29bd6cc596964dbe7348065932dd59075fc
Reviewed-on: https://go-review.googlesource.com/40403
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
Reviewed-by: Robert Griesemer <gri@golang.org>
This commit is contained in:
Josh Bleecher Snyder 2017-04-12 06:51:24 -07:00
parent 7ee420f17d
commit 9bf174b4d3
4 changed files with 34 additions and 3 deletions
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2
cmd/stringer/endtoend_test.go
View File

@ -33,7 +33,7 @@ func TestEndToEnd(t *testing.T) {
defer os.RemoveAll(dir)
// Create stringer in temporary directory.
stringer := filepath.Join(dir, "stringer.exe")
err = run("go", "build", "-o", stringer, "stringer.go")
err = run("go", "build", "-o", stringer)
if err != nil {
t.Fatalf("building stringer: %s", err)
}

16
cmd/stringer/importer18.go Normal file
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@ -0,0 +1,16 @@
// Copyright 2017 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build !go1.9
package main
import (
"go/importer"
"go/types"
)
func defaultImporter() types.Importer {
return importer.Default()
}

16
cmd/stringer/importer19.go Normal file
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@ -0,0 +1,16 @@
// Copyright 2017 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build go1.9
package main
import (
"go/importer"
"go/types"
)
func defaultImporter() types.Importer {
return importer.For("source", nil)
}

3
cmd/stringer/stringer.go
View File

@ -66,7 +66,6 @@ import (
"go/build"
exact "go/constant"
"go/format"
"go/importer"
"go/parser"
"go/token"
"go/types"
@ -258,7 +257,7 @@ func (g *Generator) parsePackage(directory string, names []string, text interfac
// check type-checks the package. The package must be OK to proceed.
func (pkg *Package) check(fs *token.FileSet, astFiles []*ast.File) {
pkg.defs = make(map[*ast.Ident]types.Object)
config := types.Config{Importer: importer.Default(), FakeImportC: true}
config := types.Config{Importer: defaultImporter(), FakeImportC: true}
info := &types.Info{
Defs: pkg.defs,
}