gofix: make fix order explicit

Also test only specific fixes, not all fixes.
This means we don't have to keep updating old
test cases to match later changes to the library.

I had to adjust some of the reflect test cases,
because they were implicitly testing
reflect+oserrorstring, not just reflect.

R=golang-dev, bradfitz, r
CC=golang-dev
https://golang.org/cl/5283042

src/cmd/gofix/filepath.go

@@ -8,15 +8,13 @@ import (
 	"go/ast"
 )
 
-func init() {
-	register(fix{
-		"filepath",
-		filepathFunc,
-		`Adapt code from filepath.[List]SeparatorString to string(filepath.[List]Separator).
+var filepathFix = fix{
+	"filepath",
+	filepathFunc,
+	`Adapt code from filepath.[List]SeparatorString to string(filepath.[List]Separator).
 
 http://codereview.appspot.com/4527090
 `,
-	})
 }
 
 func filepathFunc(f *ast.File) (fixed bool) {

src/cmd/gofix/filepath_test.go

@@ -5,7 +5,7 @@
 package main
 
 func init() {
-	addTestCases(filepathTests)
+	addTestCases(filepathTests, filepathFunc)
 }
 
 var filepathTests = []testCase{

src/cmd/gofix/fix.go

@@ -26,10 +26,33 @@ func (f fixlist) Len() int           { return len(f) }
 func (f fixlist) Swap(i, j int)      { f[i], f[j] = f[j], f[i] }
 func (f fixlist) Less(i, j int) bool { return f[i].name < f[j].name }
 
-var fixes fixlist
-
-func register(f fix) {
-	fixes = append(fixes, f)
+var fixes = fixlist{
+	// NOTE: This list must be in chronological order,
+	// so that code using APIs that changed multiple times
+	// can be updated in the correct order.
+	// Add new fixes to bottom of list.  Do not sort.
+	httpserverFix,
+	procattrFix,
+	netdialFix,
+	netlookupFix,
+	tlsdialFix,
+	osopenFix,
+	reflectFix,
+	httpFinalURLFix,
+	httpHeadersFix,
+	oserrorstringFix,
+	sortsliceFix,
+	filepathFix,
+	httpFileSystemFix,
+	stringssplitFix,
+	signalFix,
+	sorthelpersFix,
+	urlFix,
+	netudpgroupFix,
+	imagenewFix,
+	mathFix,
+	ioCopyNFix,
+	imagecolorFix,
 }
 
 // walk traverses the AST x, calling visit(y) for each node y in the tree but

src/cmd/gofix/httpfinalurl.go

@@ -17,10 +17,6 @@ http://codereview.appspot.com/4535056/
 `,
 }
 
-func init() {
-	register(httpFinalURLFix)
-}
-
 func httpfinalurl(f *ast.File) bool {
 	if !imports(f, "http") {
 		return false

src/cmd/gofix/httpfinalurl_test.go

@@ -5,7 +5,7 @@
 package main
 
 func init() {
-	addTestCases(httpfinalurlTests)
+	addTestCases(httpfinalurlTests, httpfinalurl)
 }
 
 var httpfinalurlTests = []testCase{

src/cmd/gofix/httpfs.go

@@ -18,10 +18,6 @@ http://codereview.appspot.com/4629047  http FileSystem interface
 `,
 }
 
-func init() {
-	register(httpFileSystemFix)
-}
-
 func httpfs(f *ast.File) bool {
 	if !imports(f, "http") {
 		return false

src/cmd/gofix/httpfs_test.go

@@ -5,7 +5,7 @@
 package main
 
 func init() {
-	addTestCases(httpFileSystemTests)
+	addTestCases(httpFileSystemTests, httpfs)
 }
 
 var httpFileSystemTests = []testCase{

src/cmd/gofix/httpheaders.go

@@ -17,10 +17,6 @@ http://codereview.appspot.com/4620049/
 `,
 }
 
-func init() {
-	register(httpHeadersFix)
-}
-
 func httpheaders(f *ast.File) bool {
 	if !imports(f, "http") {
 		return false

src/cmd/gofix/httpheaders_test.go

@@ -5,7 +5,7 @@
 package main
 
 func init() {
-	addTestCases(httpHeadersTests)
+	addTestCases(httpHeadersTests, httpheaders)
 }
 
 var httpHeadersTests = []testCase{

src/cmd/gofix/httpserver.go

@@ -22,10 +22,6 @@ http://codereview.appspot.com/4248075  RemoteAddr, UsingTLS
 `,
 }
 
-func init() {
-	register(httpserverFix)
-}
-
 func httpserver(f *ast.File) bool {
 	if !imports(f, "http") {
 		return false

src/cmd/gofix/httpserver_test.go

@@ -5,7 +5,7 @@
 package main
 
 func init() {
-	addTestCases(httpserverTests)
+	addTestCases(httpserverTests, httpserver)
 }
 
 var httpserverTests = []testCase{

src/cmd/gofix/imagecolor.go

@@ -8,15 +8,13 @@ import (
 	"go/ast"
 )
 
-func init() {
-	register(fix{
-		"color",
-		color,
-		`Adapt code to types moved from image to color.
+var imagecolorFix = fix{
+	"imagecolor",
+	imagecolor,
+	`Adapt code to types moved from image to color.
 
 http://codereview.appspot.com/5132048
 `,
-	})
 }
 
 var colorRenames = []struct{ in, out string }{
@@ -44,7 +42,7 @@ var colorRenames = []struct{ in, out string }{
 	{"Gray16ColorModel", "Gray16Model"},
 }
 
-func color(f *ast.File) (fixed bool) {
+func imagecolor(f *ast.File) (fixed bool) {
 	if !imports(f, "image") {
 		return
 	}

src/cmd/gofix/imagecolor_test.go

@@ -5,7 +5,7 @@
 package main
 
 func init() {
-	addTestCases(colorTests)
+	addTestCases(colorTests, imagecolor)
 }
 
 var colorTests = []testCase{

src/cmd/gofix/imagenew.go

@@ -17,10 +17,6 @@ http://codereview.appspot.com/4964073
 `,
 }
 
-func init() {
-	register(imagenewFix)
-}
-
 var imagenewFuncs = map[string]bool{
 	"NewRGBA":    true,
 	"NewRGBA64":  true,

src/cmd/gofix/imagenew_test.go

@@ -5,7 +5,7 @@
 package main
 
 func init() {
-	addTestCases(imagenewTests)
+	addTestCases(imagenewTests, imagenew)
 }
 
 var imagenewTests = []testCase{

src/cmd/gofix/iocopyn.go

@@ -17,10 +17,6 @@ http://codereview.appspot.com/5157045
 `,
 }
 
-func init() {
-	register(ioCopyNFix)
-}
-
 func ioCopyN(f *ast.File) bool {
 	if !imports(f, "io") {
 		return false

src/cmd/gofix/iocopyn_test.go

@@ -5,7 +5,7 @@
 package main
 
 func init() {
-	addTestCases(ioCopyNTests)
+	addTestCases(ioCopyNTests, ioCopyN)
 }
 
 var ioCopyNTests = []testCase{

src/cmd/gofix/main_test.go

@@ -22,7 +22,15 @@ type testCase struct {
 
 var testCases []testCase
 
-func addTestCases(t []testCase) {
+func addTestCases(t []testCase, fn func(*ast.File) bool) {
+	// Fill in fn to avoid repetition in definitions.
+	if fn != nil {
+		for i := range t {
+			if t[i].Fn == nil {
+				t[i].Fn = fn
+			}
+		}
+	}
 	testCases = append(testCases, t...)
 }
 

src/cmd/gofix/math.go

@@ -22,10 +22,6 @@ http://codereview.appspot.com/5158043
 `,
 }
 
-func init() {
-	register(mathFix)
-}
-
 var mathRenames = []struct{ in, out string }{
 	{"Fabs", "Abs"},
 	{"Fdim", "Dim"},

src/cmd/gofix/math_test.go

@@ -5,7 +5,7 @@
 package main
 
 func init() {
-	addTestCases(mathTests)
+	addTestCases(mathTests, math)
 }
 
 var mathTests = []testCase{

src/cmd/gofix/netdial.go

@@ -35,12 +35,6 @@ http://codereview.appspot.com/4244055
 `,
 }
 
-func init() {
-	register(netdialFix)
-	register(tlsdialFix)
-	register(netlookupFix)
-}
-
 func netdial(f *ast.File) bool {
 	if !imports(f, "net") {
 		return false

src/cmd/gofix/netdial_test.go

@@ -1,12 +1,13 @@
 package main
 
 func init() {
-	addTestCases(netdialTests)
+	addTestCases(netdialTests, nil)
 }
 
 var netdialTests = []testCase{
 	{
 		Name: "netdial.0",
+		Fn:   netdial,
 		In: `package main
 
 import "net"
@@ -29,6 +30,7 @@ func f() {
 
 	{
 		Name: "netlookup.0",
+		Fn:   netlookup,
 		In: `package main
 
 import "net"

src/cmd/gofix/netudpgroup.go

@@ -17,10 +17,6 @@ http://codereview.appspot.com/4815074
 `,
 }
 
-func init() {
-	register(netudpgroupFix)
-}
-
 func netudpgroup(f *ast.File) bool {
 	if !imports(f, "net") {
 		return false

src/cmd/gofix/netudpgroup_test.go

@@ -5,7 +5,7 @@
 package main
 
 func init() {
-	addTestCases(netudpgroupTests)
+	addTestCases(netudpgroupTests, netudpgroup)
 }
 
 var netudpgroupTests = []testCase{

src/cmd/gofix/oserrorstring.go

@@ -17,10 +17,6 @@ http://codereview.appspot.com/4607052
 `,
 }
 
-func init() {
-	register(oserrorstringFix)
-}
-
 func oserrorstring(f *ast.File) bool {
 	if !imports(f, "os") {
 		return false

src/cmd/gofix/oserrorstring_test.go

@@ -5,7 +5,7 @@
 package main
 
 func init() {
-	addTestCases(oserrorstringTests)
+	addTestCases(oserrorstringTests, oserrorstring)
 }
 
 var oserrorstringTests = []testCase{

src/cmd/gofix/osopen.go

@@ -17,10 +17,6 @@ http://codereview.appspot.com/4357052
 `,
 }
 
-func init() {
-	register(osopenFix)
-}
-
 func osopen(f *ast.File) bool {
 	if !imports(f, "os") {
 		return false

src/cmd/gofix/osopen_test.go

@@ -5,7 +5,7 @@
 package main
 
 func init() {
-	addTestCases(osopenTests)
+	addTestCases(osopenTests, osopen)
 }
 
 var osopenTests = []testCase{

src/cmd/gofix/procattr.go

@@ -18,10 +18,6 @@ http://codereview.appspot.com/4253052
 `,
 }
 
-func init() {
-	register(procattrFix)
-}
-
 func procattr(f *ast.File) bool {
 	if !imports(f, "os") && !imports(f, "syscall") {
 		return false

src/cmd/gofix/procattr_test.go

@@ -5,7 +5,7 @@
 package main
 
 func init() {
-	addTestCases(procattrTests)
+	addTestCases(procattrTests, procattr)
 }
 
 var procattrTests = []testCase{

src/cmd/gofix/reflect.go

@@ -25,10 +25,6 @@ http://codereview.appspot.com/4433066
 `,
 }
 
-func init() {
-	register(reflectFix)
-}
-
 // The reflect API change dropped the concrete types *reflect.ArrayType etc.
 // Any type assertions prior to method calls can be deleted:
 //	x.(*reflect.ArrayType).Len() -> x.Len()

src/cmd/gofix/reflect_test.go

@@ -7,7 +7,7 @@ import (
 )
 
 func init() {
-	addTestCases(reflectTests())
+	addTestCases(reflectTests(), reflectFn)
 }
 
 func reflectTests() []testCase {

src/cmd/gofix/signal.go

@@ -9,15 +9,13 @@ import (
 	"strings"
 )
 
-func init() {
-	register(fix{
-		"signal",
-		signal,
-		`Adapt code to types moved from os/signal to signal.
+var signalFix = fix{
+	"signal",
+	signal,
+	`Adapt code to types moved from os/signal to signal.
 
 http://codereview.appspot.com/4437091
 `,
-	})
 }
 
 func signal(f *ast.File) (fixed bool) {

src/cmd/gofix/signal_test.go

@@ -5,7 +5,7 @@
 package main
 
 func init() {
-	addTestCases(signalTests)
+	addTestCases(signalTests, signal)
 }
 
 var signalTests = []testCase{

src/cmd/gofix/sorthelpers.go

@@ -8,13 +8,11 @@ import (
 	"go/ast"
 )
 
-func init() {
-	register(fix{
-		"sorthelpers",
-		sorthelpers,
-		`Adapt code from sort.Sort[Ints|Float64s|Strings] to sort.[Ints|Float64s|Strings].
+var sorthelpersFix = fix{
+	"sorthelpers",
+	sorthelpers,
+	`Adapt code from sort.Sort[Ints|Float64s|Strings] to sort.[Ints|Float64s|Strings].
 `,
-	})
 }
 
 func sorthelpers(f *ast.File) (fixed bool) {

src/cmd/gofix/sorthelpers_test.go

@@ -5,7 +5,7 @@
 package main
 
 func init() {
-	addTestCases(sorthelpersTests)
+	addTestCases(sorthelpersTests, sorthelpers)
 }
 
 var sorthelpersTests = []testCase{

src/cmd/gofix/sortslice.go

@@ -8,16 +8,14 @@ import (
 	"go/ast"
 )
 
-func init() {
-	register(fix{
-		"sortslice",
-		sortslice,
-		`Adapt code from sort.[Float64|Int|String]Array to  sort.[Float64|Int|String]Slice.
+var sortsliceFix = fix{
+	"sortslice",
+	sortslice,
+	`Adapt code from sort.[Float64|Int|String]Array to  sort.[Float64|Int|String]Slice.
 		
 http://codereview.appspot.com/4602054
 http://codereview.appspot.com/4639041
 `,
-	})
 }
 
 func sortslice(f *ast.File) (fixed bool) {

src/cmd/gofix/sortslice_test.go

@@ -5,7 +5,7 @@
 package main
 
 func init() {
-	addTestCases(sortsliceTests)
+	addTestCases(sortsliceTests, sortslice)
 }
 
 var sortsliceTests = []testCase{

src/cmd/gofix/stringssplit.go

@@ -18,10 +18,6 @@ http://codereview.appspot.com/4661051
 `,
 }
 
-func init() {
-	register(stringssplitFix)
-}
-
 func stringssplit(f *ast.File) bool {
 	if !imports(f, "bytes") && !imports(f, "strings") {
 		return false

src/cmd/gofix/stringssplit_test.go

@@ -5,7 +5,7 @@
 package main
 
 func init() {
-	addTestCases(stringssplitTests)
+	addTestCases(stringssplitTests, stringssplit)
 }
 
 var stringssplitTests = []testCase{

src/cmd/gofix/testdata/reflect.decoder.go.in

@@ -44,7 +44,7 @@ func NewDecoder(r io.Reader) *Decoder {
 func (dec *Decoder) recvType(id typeId) {
 	// Have we already seen this type?  That's an error
 	if id < firstUserId || dec.wireType[id] != nil {
-		dec.err = os.ErrorString("gob: duplicate type received")
+		dec.err = os.NewError("gob: duplicate type received")
 		return
 	}
 
@@ -143,7 +143,7 @@ func (dec *Decoder) decodeTypeSequence(isInterface bool) typeId {
 		// will be absorbed by recvMessage.)
 		if dec.buf.Len() > 0 {
 			if !isInterface {
-				dec.err = os.ErrorString("extra data in buffer")
+				dec.err = os.NewError("extra data in buffer")
 				break
 			}
 			dec.nextUint()
@@ -165,7 +165,7 @@ func (dec *Decoder) Decode(e interface{}) os.Error {
 	// If e represents a value as opposed to a pointer, the answer won't
 	// get back to the caller.  Make sure it's a pointer.
 	if value.Type().Kind() != reflect.Ptr {
-		dec.err = os.ErrorString("gob: attempt to decode into a non-pointer")
+		dec.err = os.NewError("gob: attempt to decode into a non-pointer")
 		return dec.err
 	}
 	return dec.DecodeValue(value)

src/cmd/gofix/testdata/reflect.encoder.go.in

@@ -50,7 +50,7 @@ func (enc *Encoder) popWriter() {
 }
 
 func (enc *Encoder) badType(rt reflect.Type) {
-	enc.setError(os.ErrorString("gob: can't encode type " + rt.String()))
+	enc.setError(os.NewError("gob: can't encode type " + rt.String()))
 }
 
 func (enc *Encoder) setError(err os.Error) {

src/cmd/gofix/testdata/reflect.export.go.in

@@ -343,20 +343,20 @@ func (exp *Exporter) Sync(timeout int64) os.Error {
 func checkChan(chT interface{}, dir Dir) (*reflect.ChanValue, os.Error) {
 	chanType, ok := reflect.Typeof(chT).(*reflect.ChanType)
 	if !ok {
-		return nil, os.ErrorString("not a channel")
+		return nil, os.NewError("not a channel")
 	}
 	if dir != Send && dir != Recv {
-		return nil, os.ErrorString("unknown channel direction")
+		return nil, os.NewError("unknown channel direction")
 	}
 	switch chanType.Dir() {
 	case reflect.BothDir:
 	case reflect.SendDir:
 		if dir != Recv {
-			return nil, os.ErrorString("to import/export with Send, must provide <-chan")
+			return nil, os.NewError("to import/export with Send, must provide <-chan")
 		}
 	case reflect.RecvDir:
 		if dir != Send {
-			return nil, os.ErrorString("to import/export with Recv, must provide chan<-")
+			return nil, os.NewError("to import/export with Recv, must provide chan<-")
 		}
 	}
 	return reflect.NewValue(chT).(*reflect.ChanValue), nil
@@ -376,7 +376,7 @@ func (exp *Exporter) Export(name string, chT interface{}, dir Dir) os.Error {
 	defer exp.mu.Unlock()
 	_, present := exp.names[name]
 	if present {
-		return os.ErrorString("channel name already being exported:" + name)
+		return os.NewError("channel name already being exported:" + name)
 	}
 	exp.names[name] = &chanDir{ch, dir}
 	return nil
@@ -393,7 +393,7 @@ func (exp *Exporter) Hangup(name string) os.Error {
 	// TODO drop all instances of channel from client sets
 	exp.mu.Unlock()
 	if !ok {
-		return os.ErrorString("netchan export: hangup: no such channel: " + name)
+		return os.NewError("netchan export: hangup: no such channel: " + name)
 	}
 	chDir.ch.Close()
 	return nil

src/cmd/gofix/testdata/reflect.print.go.in

@@ -185,7 +185,7 @@ func Sprintf(format string, a ...interface{}) string {
 // Errorf formats according to a format specifier and returns the string 
 // converted to an os.ErrorString, which satisfies the os.Error interface.
 func Errorf(format string, a ...interface{}) os.Error {
-	return os.ErrorString(Sprintf(format, a...))
+	return os.NewError(Sprintf(format, a...))
 }
 
 // These routines do not take a format string

src/cmd/gofix/testdata/reflect.read.go.in

@@ -244,7 +244,7 @@ func (p *Parser) unmarshal(val reflect.Value, start *StartElement) os.Error {
 
 	switch v := val.(type) {
 	default:
-		return os.ErrorString("unknown type " + v.Type().String())
+		return os.NewError("unknown type " + v.Type().String())
 
 	case *reflect.SliceValue:
 		typ := v.Type().(*reflect.SliceType)
@@ -483,7 +483,7 @@ Loop:
 	case nil:
 		// Probably a comment, handled below
 	default:
-		return os.ErrorString("cannot happen: unknown type " + t.Type().String())
+		return os.NewError("cannot happen: unknown type " + t.Type().String())
 	case *reflect.IntValue:
 		if !getInt64() {
 			return err

src/cmd/gofix/testdata/reflect.scan.go.in

@@ -167,7 +167,7 @@ type ssave struct {
 // satisfies io.Reader. It will never be called when used as
 // intended, so there is no need to make it actually work.
 func (s *ss) Read(buf []byte) (n int, err os.Error) {
-	return 0, os.ErrorString("ScanState's Read should not be called. Use ReadRune")
+	return 0, os.NewError("ScanState's Read should not be called. Use ReadRune")
 }
 
 func (s *ss) ReadRune() (rune int, size int, err os.Error) {
@@ -240,7 +240,7 @@ func (s *ss) error(err os.Error) {
 }
 
 func (s *ss) errorString(err string) {
-	panic(scanError{os.ErrorString(err)})
+	panic(scanError{os.NewError(err)})
 }
 
 func (s *ss) Token(skipSpace bool, f func(int) bool) (tok []byte, err os.Error) {
@@ -424,8 +424,8 @@ func (s *ss) typeError(field interface{}, expected string) {
 	s.errorString("expected field of type pointer to " + expected + "; found " + reflect.Typeof(field).String())
 }
 
-var complexError = os.ErrorString("syntax error scanning complex number")
-var boolError = os.ErrorString("syntax error scanning boolean")
+var complexError = os.NewError("syntax error scanning complex number")
+var boolError = os.NewError("syntax error scanning boolean")
 
 // consume reads the next rune in the input and reports whether it is in the ok string.
 // If accept is true, it puts the character into the input token.

src/cmd/gofix/testdata/reflect.type.go.in

@@ -67,7 +67,7 @@ func validUserType(rt reflect.Type) (ut *userTypeInfo, err os.Error) {
 		ut.base = pt.Elem()
 		if ut.base == slowpoke { // ut.base lapped slowpoke
 			// recursive pointer type.
-			return nil, os.ErrorString("can't represent recursive pointer type " + ut.base.String())
+			return nil, os.NewError("can't represent recursive pointer type " + ut.base.String())
 		}
 		if ut.indir%2 == 0 {
 			slowpoke = slowpoke.(*reflect.PtrType).Elem()
@@ -524,7 +524,7 @@ func newTypeObject(name string, ut *userTypeInfo, rt reflect.Type) (gobType, os.
 		return st, nil
 
 	default:
-		return nil, os.ErrorString("gob NewTypeObject can't handle type: " + rt.String())
+		return nil, os.NewError("gob NewTypeObject can't handle type: " + rt.String())
 	}
 	return nil, nil
 }

src/cmd/gofix/url.go

@@ -22,10 +22,6 @@ http://codereview.appspot.com/4893043
 `,
 }
 
-func init() {
-	register(urlFix)
-}
-
 var urlRenames = []struct{ in, out string }{
 	{"URL", "URL"},
 	{"ParseURL", "Parse"},

src/cmd/gofix/url_test.go

@@ -5,7 +5,7 @@
 package main
 
 func init() {
-	addTestCases(urlTests)
+	addTestCases(urlTests, url)
 }
 
 var urlTests = []testCase{