wire: add a testcase with multiple similar packages (google/go-cloud#387)

This is based on the description in google/go-cloud#372. It will be useful if we add wire.FieldsOf, and also for the disambiguation-using-package.

Updates google/go-cloud#372
Updates google/go-cloud#386

internal/wire/testdata/MultipleSimilarPackages/bar/bar.go

@@ -0,0 +1,32 @@
+// Copyright 2018 The Go Cloud Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package bar
+
+import (
+	"example.com/foo"
+)
+
+type Config struct {
+	V int
+}
+
+type Service struct {
+	Cfg *Config
+	F   *foo.Service
+}
+
+func New(cfg *Config, f *foo.Service) *Service {
+	return &Service{Cfg: cfg, F: f}
+}

internal/wire/testdata/MultipleSimilarPackages/baz/baz.go

@@ -0,0 +1,32 @@
+// Copyright 2018 The Go Cloud Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package baz
+
+import (
+	"example.com/bar"
+)
+
+type Config struct {
+	V int
+}
+
+type Service struct {
+	Cfg *Config
+	B   *bar.Service
+}
+
+func New(cfg *Config, b *bar.Service) *Service {
+	return &Service{Cfg: cfg, B: b}
+}

internal/wire/testdata/MultipleSimilarPackages/foo/foo.go

@@ -0,0 +1,27 @@
+// Copyright 2018 The Go Cloud Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package foo
+
+type Config struct {
+	V int
+}
+
+type Service struct {
+	Cfg *Config
+}
+
+func New(cfg *Config) *Service {
+	return &Service{Cfg: cfg}
+}

internal/wire/testdata/MultipleSimilarPackages/main/wire.go

@@ -0,0 +1,62 @@
+// Copyright 2018 The Go Cloud Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//+build wireinject
+
+package main
+
+import (
+	"fmt"
+
+	"example.com/bar"
+	"example.com/baz"
+	"example.com/foo"
+	"github.com/google/go-cloud/wire"
+)
+
+type MainConfig struct {
+	Foo *foo.Config
+	Bar *bar.Config
+	Baz *baz.Config
+}
+
+type MainService struct {
+	Foo *foo.Service
+	Bar *bar.Service
+	Baz *baz.Service
+}
+
+func (m *MainService) String() string {
+	return fmt.Sprintf("%d %d %d", m.Foo.Cfg.V, m.Bar.Cfg.V, m.Baz.Cfg.V)
+}
+
+func newMainService(*foo.Config, *bar.Config, *baz.Config) *MainService {
+	wire.Build(
+		MainService{},
+		foo.New,
+		bar.New,
+		baz.New,
+	)
+	return nil
+}
+
+func main() {
+	cfg := &MainConfig{
+		Foo: &foo.Config{1},
+		Bar: &bar.Config{2},
+		Baz: &baz.Config{3},
+	}
+	svc := newMainService(cfg.Foo, cfg.Bar, cfg.Baz)
+	fmt.Println(svc.String())
+}

internal/wire/testdata/MultipleSimilarPackages/pkg

@@ -0,0 +1 @@
+example.com/main

internal/wire/testdata/MultipleSimilarPackages/want/program_out.txt

@@ -0,0 +1 @@
+1 2 3

internal/wire/testdata/MultipleSimilarPackages/want/wire_gen.go

@@ -0,0 +1,55 @@
+// Code generated by Wire. DO NOT EDIT.
+
+//go:generate wire
+//+build !wireinject
+
+package main
+
+import (
+	bar "example.com/bar"
+	baz "example.com/baz"
+	foo "example.com/foo"
+	fmt "fmt"
+)
+
+// Injectors from wire.go:
+
+func newMainService(config *foo.Config, config2 *bar.Config, config3 *baz.Config) *MainService {
+	service := foo.New(config)
+	service2 := bar.New(config2, service)
+	service3 := baz.New(config3, service2)
+	mainService := &MainService{
+		Foo: service,
+		Bar: service2,
+		Baz: service3,
+	}
+	return mainService
+}
+
+// wire.go:
+
+type MainConfig struct {
+	Foo *foo.Config
+	Bar *bar.Config
+	Baz *baz.Config
+}
+
+type MainService struct {
+	Foo *foo.Service
+	Bar *bar.Service
+	Baz *baz.Service
+}
+
+func (m *MainService) String() string {
+	return fmt.Sprintf("%d %d %d", m.Foo.Cfg.V, m.Bar.Cfg.V, m.Baz.Cfg.V)
+}
+
+func main() {
+	cfg := &MainConfig{
+		Foo: &foo.Config{1},
+		Bar: &bar.Config{2},
+		Baz: &baz.Config{3},
+	}
+	svc := newMainService(cfg.Foo, cfg.Bar, cfg.Baz)
+	fmt.Println(svc.String())
+}