gofix: add fix httputil

R=r, rsc, adg
CC=golang-dev
https://golang.org/cl/5364056

src/cmd/gofix/Makefile

@@ -16,6 +16,7 @@ GOFILES=\
 	httpfs.go\
 	httpheaders.go\
 	httpserver.go\
+	httputil.go\
 	imagecolor.go\
 	imagenew.go\
 	iocopyn.go\

src/cmd/gofix/httputil.go

+// Copyright 2011 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.
+
+package main
+
+import "go/ast"
+
+func init() {
+	register(httputilFix)
+}
+
+var httputilFix = fix{
+	"httputil",
+	"2011-11-18",
+	httputil,
+	`Move some functions in http package into httputil package.
+
+http://codereview.appspot.com/5336049
+`,
+}
+
+var httputilFuncs = []string{
+	"DumpRequest",
+	"DumpRequestOut",
+	"DumpResponse",
+	"NewChunkedReader",
+	"NewChunkedWriter",
+	"NewClientConn",
+	"NewProxyClientConn",
+	"NewServerConn",
+	"NewSingleHostReverseProxy",
+}
+
+func httputil(f *ast.File) bool {
+	if imports(f, "net/http/httputil") {
+		return false
+	}
+
+	fixed := false
+
+	walk(f, func(n interface{}) {
+		// Rename package name.
+		if expr, ok := n.(ast.Expr); ok {
+			for _, s := range httputilFuncs {
+				if isPkgDot(expr, "http", s) {
+					if !fixed {
+						addImport(f, "net/http/httputil")
+						fixed = true
+					}
+					expr.(*ast.SelectorExpr).X.(*ast.Ident).Name = "httputil"
+				}
+			}
+		}
+	})
+
+	// Remove the net/http import if no longer needed.
+	if fixed && !usesImport(f, "net/http") {
+		deleteImport(f, "net/http")
+	}
+
+	return fixed
+}

src/cmd/gofix/httputil_test.go

+// Copyright 2011 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.
+
+package main
+
+func init() {
+	addTestCases(httputilTests, httputil)
+}
+
+var httputilTests = []testCase{
+	{
+		Name: "httputil.0",
+		In: `package main
+
+import "net/http"
+
+func f() {
+	http.DumpRequest(nil, false)
+	http.DumpRequestOut(nil, false)
+	http.DumpResponse(nil, false)
+	http.NewChunkedReader(nil)
+	http.NewChunkedWriter(nil)
+	http.NewClientConn(nil, nil)
+	http.NewProxyClientConn(nil, nil)
+	http.NewServerConn(nil, nil)
+	http.NewSingleHostReverseProxy(nil)
+}
+`,
+		Out: `package main
+
+import "net/http/httputil"
+
+func f() {
+	httputil.DumpRequest(nil, false)
+	httputil.DumpRequestOut(nil, false)
+	httputil.DumpResponse(nil, false)
+	httputil.NewChunkedReader(nil)
+	httputil.NewChunkedWriter(nil)
+	httputil.NewClientConn(nil, nil)
+	httputil.NewProxyClientConn(nil, nil)
+	httputil.NewServerConn(nil, nil)
+	httputil.NewSingleHostReverseProxy(nil)
+}
+`,
+	},
+	{
+		Name: "httputil.1",
+		In: `package main
+
+import "net/http"
+
+func f() {
+	http.DumpRequest(nil, false)
+	http.DumpRequestOut(nil, false)
+	http.DumpResponse(nil, false)
+	http.NewChunkedReader(nil)
+	http.NewChunkedWriter(nil)
+	http.NewClientConn(nil, nil)
+	http.NewProxyClientConn(nil, nil)
+	http.NewServerConn(nil, nil)
+	http.NewSingleHostReverseProxy(nil)
+}
+`,
+		Out: `package main
+
+import "net/http/httputil"
+
+func f() {
+	httputil.DumpRequest(nil, false)
+	httputil.DumpRequestOut(nil, false)
+	httputil.DumpResponse(nil, false)
+	httputil.NewChunkedReader(nil)
+	httputil.NewChunkedWriter(nil)
+	httputil.NewClientConn(nil, nil)
+	httputil.NewProxyClientConn(nil, nil)
+	httputil.NewServerConn(nil, nil)
+	httputil.NewSingleHostReverseProxy(nil)
+}
+`,
+	},
+	{
+		Name: "httputil.2",
+		In: `package main
+
+import "net/http"
+
+func f() {
+	http.DumpRequest(nil, false)
+	http.DumpRequestOut(nil, false)
+	http.DumpResponse(nil, false)
+	http.NewChunkedReader(nil)
+	http.NewChunkedWriter(nil)
+	http.NewClientConn(nil, nil)
+	http.NewProxyClientConn(nil, nil)
+	http.NewServerConn(nil, nil)
+	http.NewSingleHostReverseProxy(nil)
+	http.Get("")
+}
+`,
+		Out: `package main
+
+import (
+	"net/http"
+	"net/http/httputil"
+)
+
+func f() {
+	httputil.DumpRequest(nil, false)
+	httputil.DumpRequestOut(nil, false)
+	httputil.DumpResponse(nil, false)
+	httputil.NewChunkedReader(nil)
+	httputil.NewChunkedWriter(nil)
+	httputil.NewClientConn(nil, nil)
+	httputil.NewProxyClientConn(nil, nil)
+	httputil.NewServerConn(nil, nil)
+	httputil.NewSingleHostReverseProxy(nil)
+	http.Get("")
+}
+`,
+	},
+}