func processGlGo(dirName string) {
data, err := ioutil.ReadFile(dirName + "/gl.go")
if err != nil {
log.Fatal("ioutil.ReadFile: ", err)
}
data, _ = format.Source(data)
oldStr := "// #cgo pkg-config: Qt5Core Qt5OpenGL\n"
newStr := "// #cgo !windows pkg-config: Qt5Core Qt5OpenGL\n// #cgo windows LDFLAGS: -L./goqgl -lgoqgl_{{.LibSuffix}}\n"
newStr = strings.Replace(newStr, "{{.LibSuffix}}", libSuffix(dirName), -1)
if *flagRevert {
data = bytes.Replace(data, []byte(newStr), []byte(oldStr), -1)
data, _ = format.Source(data)
err = ioutil.WriteFile(dirName+"/gl.go", data, 0666)
if err != nil {
log.Fatal("ioutil.WriteFile: ", err)
}
return
} else {
data = bytes.Replace(data, []byte(oldStr), []byte(newStr), -1)
data, _ = format.Source(data)
err = ioutil.WriteFile(dirName+"/gl.go", data, 0666)
if err != nil {
log.Fatal("ioutil.WriteFile: ", err)
}
return
}
}
func processGlGo_importPath(dirName string) {
data, err := ioutil.ReadFile(dirName + "/gl.go")
if err != nil {
log.Fatal("ioutil.ReadFile: ", err)
}
data, _ = format.Source(data)
oldStr := `"gopkg.in/qml.v1/gl/glbase"`
newStr := `"github.com/chai2010/qml/gl/glbase"`
if *flagRevert {
data = bytes.Replace(data, []byte(newStr), []byte(oldStr), -1)
data, _ = format.Source(data)
err = ioutil.WriteFile(dirName+"/gl.go", data, 0666)
if err != nil {
log.Fatal("ioutil.WriteFile: ", err)
}
return
} else {
data = bytes.Replace(data, []byte(oldStr), []byte(newStr), -1)
data, _ = format.Source(data)
err = ioutil.WriteFile(dirName+"/gl.go", data, 0666)
if err != nil {
log.Fatal("ioutil.WriteFile: ", err)
}
return
}
}
// Given a JSON string representation of an object and a name structName,
// attemp to generate a struct definition
func Generate(input io.Reader, parser Parser, structName, pkgName string, tags []string, subStruct bool) ([]byte, error) {
var subStructMap map[string]string = nil
if subStruct {
subStructMap = make(map[string]string)
}
var result map[string]interface{}
iresult, err := parser(input)
if err != nil {
return nil, err
}
switch iresult := iresult.(type) {
case map[interface{}]interface{}:
result = convertKeysToStrings(iresult)
case map[string]interface{}:
result = iresult
case []interface{}:
src := fmt.Sprintf("package %s\n\ntype %s %s\n",
pkgName,
structName,
typeForValue(iresult, structName, tags, subStructMap))
formatted, err := format.Source([]byte(src))
if err != nil {
err = fmt.Errorf("error formatting: %s, was formatting\n%s", err, src)
}
return formatted, err
default:
return nil, fmt.Errorf("unexpected type: %T", iresult)
}
src := fmt.Sprintf("package %s\ntype %s %s}",
pkgName,
structName,
generateTypes(result, structName, tags, 0, subStructMap))
keys := make([]string, 0, len(subStructMap))
for key := range subStructMap {
keys = append(keys, key)
}
sort.Strings(keys)
for _, k := range keys {
src = fmt.Sprintf("%v\n\ntype %v %v", src, subStructMap[k], k)
}
formatted, err := format.Source([]byte(src))
if err != nil {
err = fmt.Errorf("error formatting: %s, was formatting\n%s", err, src)
}
return formatted, err
}
func CmdNew(c *cli.Context) {
log.SetFlags(log.Llongfile | log.LstdFlags)
pkgName := c.String("pkg")
if len(pkgName) <= 0 {
fmt.Fprintf(os.Stderr, "not selected pkg name")
os.Exit(2)
}
// mkdir
if err := os.Mkdir(pkgName, 0755); err != nil {
log.Fatalln(err)
}
// execute template
var buf bytes.Buffer
if err := PluginTmpl(&buf, pkgName); err != nil {
log.Fatalln(err)
}
// go fmt
srcBuf, err := format.Source(buf.Bytes())
if err != nil {
log.Fatalln(err)
}
// Write your code here
filePath := filepath.Join(pkgName, pkgName+".go")
if err := ioutil.WriteFile(filePath, srcBuf, 0644); err != nil {
log.Fatalln(err)
}
// execute template
buf.Reset()
if err := PluginTestTmpl(&buf, pkgName); err != nil {
log.Fatalln(err)
}
// go fmt
srcBuf, err = format.Source(buf.Bytes())
if err != nil {
log.Fatalln(err)
}
// Write your code here
filePath = filepath.Join(pkgName, pkgName+"_test.go")
if err := ioutil.WriteFile(filePath, srcBuf, 0644); err != nil {
log.Fatalln(err)
}
}
func main() {
log.SetFlags(0)
log.SetPrefix("encgen: ")
flag.Parse()
if flag.NArg() != 0 {
log.Fatal("usage: encgen [--output filename]")
}
var b bytes.Buffer
fmt.Fprintf(&b, "// Created by encgen --output %s; DO NOT EDIT\n", *output)
fmt.Fprint(&b, header)
printMaps(&b, "Array")
fmt.Fprint(&b, "\n")
printMaps(&b, "Slice")
for _, t := range types {
fmt.Fprintf(&b, arrayHelper, t.lower, t.upper)
fmt.Fprintf(&b, sliceHelper, t.lower, t.upper, t.zero, t.encoder)
}
source, err := format.Source(b.Bytes())
if err != nil {
log.Fatal("source format error:", err)
}
fd, err := os.Create(*output)
_, err = fd.Write(source)
if err != nil {
log.Fatal(err)
}
}
func (g *generator) Generate(targets []*descriptor.File) ([]*plugin.CodeGeneratorResponse_File, error) {
var files []*plugin.CodeGeneratorResponse_File
for _, file := range targets {
glog.V(1).Infof("Processing %s", file.GetName())
code, err := g.generate(file)
if err == errNoTargetService {
glog.V(1).Infof("%s: %v", file.GetName(), err)
continue
}
if err != nil {
return nil, err
}
formatted, err := format.Source([]byte(code))
if err != nil {
glog.Errorf("%v: %s", err, code)
return nil, err
}
name := file.GetName()
ext := filepath.Ext(name)
base := strings.TrimSuffix(name, ext)
output := fmt.Sprintf("%s.pb.gw.go", base)
files = append(files, &plugin.CodeGeneratorResponse_File{
Name: proto.String(output),
Content: proto.String(string(formatted)),
})
glog.V(1).Infof("Will emit %s", output)
}
return files, nil
}
func main() {
flag.Parse()
var buf bytes.Buffer
fmt.Fprintln(&buf, "package bit")
fmt.Fprintln(&buf)
fmt.Fprintln(&buf, "// autogenerated by go run gen.go -output tables.go")
fmt.Fprintln(&buf)
table(&buf, "reverseByte", 256, func(v uint64) uint64 { return reverse(v, 8) })
fmt.Fprintln(&buf)
fmt.Fprintln(&buf, "const scanTableBits = 16")
fmt.Fprintln(&buf, "const scanTableMask = (1<<scanTableBits)-1")
table(&buf, "scanLeftTable", 256*256, scanLeft)
table(&buf, "scanRightTable", 256*256, scanRight)
data, err := format.Source(buf.Bytes())
if err != nil {
log.Fatal(err)
}
err = ioutil.WriteFile(*filename, data, 0644)
if err != nil {
log.Fatal(err)
}
}
func genTypeRegistry(objects []Object, pkg string) {
file := pkg + "/registry.go"
fd, err := os.Create(file)
if err != nil {
log.Fatalln(err)
}
defer fd.Close()
data := new(bytes.Buffer)
data.WriteString("package " + pkg + "\n")
tmpl := template.Must(template.New("registry").Parse(registryTmpl))
err = tmpl.Execute(data, objects)
if err != nil {
log.Fatalln(err)
}
source := data.Bytes()
fsource, err := format.Source(source)
if err != nil {
fd.Write(source)
log.Fatalf("There are errors in the generated source for %s: %s\n", file, err.Error())
}
fd.Write(fsource)
}
func main() {
out := flag.String("o", "", "output file")
flag.Parse()
tmpl, err := template.New("tpl").Parse(fileTpl)
if err != nil {
log.Fatal(err)
}
lst := permission.PermissionRegistry.Permissions()
sort.Sort(lst)
data := context{
Time: time.Now(),
Permissions: lst,
}
var buf bytes.Buffer
err = tmpl.Execute(&buf, data)
if err != nil {
log.Fatal(err)
}
rawFile := buf.Bytes()
rawFile = bytes.Replace(rawFile, []byte("\\\n"), []byte{}, -1)
formatedFile, err := format.Source(rawFile)
if err != nil {
log.Fatalf("unable to format code: %s\n%s", err, rawFile)
}
file, err := os.OpenFile(*out, os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0660)
if err != nil {
log.Fatal(err)
}
defer file.Close()
file.Write(formatedFile)
}
func main() {
log.SetFlags(0)
log.SetPrefix("gen: ")
flag.Parse()
if flag.NArg() != 0 {
log.Fatal("usage: decgen [--output filename]")
}
// Generate output.
var buf bytes.Buffer
err := tmpl.Execute(&buf, map[string]interface{}{
"output": *output,
"goRepoPath": goRepoPath,
"goSubrepoPath": goSubrepoPath,
"gaeRepoPath": gaeRepoPath,
"packagePath": packagePath,
"pathFlags": getPathFlags(),
"validTLDs": getValidTLDs(),
})
if err != nil {
log.Fatal("template error:", err)
}
source, err := format.Source(buf.Bytes())
if err != nil {
log.Fatal("source format error:", err)
}
fd, err := os.Create(*output)
_, err = fd.Write(source)
if err != nil {
log.Fatal(err)
}
}
func generate(serverPkg, serverType, clientType string) error {
cwd, err := os.Getwd()
if err != nil {
return err
}
currentDir = cwd
methods, imports, err := serverMethods(serverPkg, serverType)
if err != nil {
return errgo.Mask(err)
}
localPkg, err := build.Import(".", currentDir, 0)
if err != nil {
return errgo.Notef(err, "cannot open package in current directory")
}
arg := templateArg{
CommandLine: strings.Join(flag.Args(), " "),
Imports: imports,
Methods: methods,
PkgName: localPkg.Name,
ClientType: clientType,
}
var buf bytes.Buffer
if err := code.Execute(&buf, arg); err != nil {
return errgo.Mask(err)
}
data, err := format.Source(buf.Bytes())
if err != nil {
return errgo.Notef(err, "cannot format source")
}
if err := writeOutput(data, clientType); err != nil {
return errgo.Mask(err)
}
return nil
}
func formatGo(src string) (string, error) {
source, err := format.Source([]byte(src))
if err != nil {
return "", err
}
return string(source), nil
}
// GenerateCode uses text/template for create Go code. package name pkg will also be used
// to remove stutter in variable names.
func GenerateCode(pkg, tplCode string, data interface{}, addFM template.FuncMap) ([]byte, error) {
funcMap := template.FuncMap{
"quote": func(s string) string { return "`" + s + "`" },
"prepareVar": prepareVar(pkg),
"camelize": util.UnderscoreCamelize,
"toLowerFirst": toLowerFirst,
"prepareVarIndex": func(i int, s string) string { return fmt.Sprintf("%03d%s", i, prepareVar(pkg)(s)) },
"sprintf": fmt.Sprintf,
}
for k, v := range addFM {
funcMap[k] = v
}
codeTpl := template.Must(template.New("tpl_code").Funcs(funcMap).Parse(tplCode))
var buf = new(bytes.Buffer)
err := codeTpl.Execute(buf, data)
if err != nil {
return nil, errgo.Mask(err)
}
fmt, err := format.Source(buf.Bytes())
if err != nil {
return buf.Bytes(), err
}
return fmt, nil
}
func main() {
flag.Parse()
w := new(bytes.Buffer)
w.WriteString("// generated by \"go run gen.go\". DO NOT EDIT.\n\n" +
"package draw\n\nimport (\n" +
"\"image\"\n" +
"\"image/color\"\n" +
"\"math\"\n" +
"\n" +
"\"golang.org/x/image/math/f64\"\n" +
")\n")
gen(w, "nnInterpolator", codeNNScaleLeaf, codeNNTransformLeaf)
gen(w, "ablInterpolator", codeABLScaleLeaf, codeABLTransformLeaf)
genKernel(w)
if *debug {
os.Stdout.Write(w.Bytes())
return
}
out, err := format.Source(w.Bytes())
if err != nil {
log.Fatal(err)
}
if err := ioutil.WriteFile("impl.go", out, 0660); err != nil {
log.Fatal(err)
}
}
func main() {
var buf bytes.Buffer
dir := filepath.Dir(".")
fs := token.NewFileSet()
parsedFile, err := parser.ParseFile(fs, "events.go", nil, 0)
if err != nil {
log.Fatalf("warning: internal error: could not parse events.go: %s", err)
return
}
names := []string{}
for object := range parsedFile.Scope.Objects {
names = append(names, object)
}
sort.Strings(names)
eventHandlerTmpl.Execute(&buf, names)
src, err := format.Source(buf.Bytes())
if err != nil {
log.Println("warning: internal error: invalid Go generated:", err)
src = buf.Bytes()
}
err = ioutil.WriteFile(filepath.Join(dir, strings.ToLower("eventhandlers.go")), src, 0644)
if err != nil {
log.Fatal(buf, "writing output: %s", err)
}
}
func generateBinding(opts *Options, version string, w io.Writer) error {
cf, err := ColumnFamilies(opts)
if err != nil {
return err
}
provenance := Provenance{
Version: version,
Timestamp: time.Now(),
}
meta := make(map[string]interface{})
meta["Provenance"] = provenance
meta["Options"] = opts
meta["Imports"] = coalesceImports(cf)
meta["ColumnFamilies"] = cf
var b bytes.Buffer
if err := bindingTemplate.Execute(&b, meta); err != nil {
return err
}
bfmt, err := format.Source(b.Bytes())
if err != nil {
return err
}
if _, err := w.Write(bfmt); err != nil {
return err
}
return nil
}
func (s *Generator) Generate() error {
session, collection, err := s.connect()
if err != nil {
return err
}
root := StructType{}
iter := collection.Find(nil).Iter()
m := bson.M{}
for iter.Next(m) {
root.Merge(NewType(m))
m = bson.M{}
}
if err := iter.Close(); err != nil {
return err
}
session.Close()
const srcFmt = "package %s\ntype %s %s"
src := fmt.Sprintf(srcFmt, s.Package, s.Struct, root.GoType())
if s.Raw {
fmt.Println(src)
}
formatted, err := format.Source([]byte(src))
if err != nil {
return err
}
fmt.Printf("%s\n", formatted)
return nil
}
func TestMockMethodUnnamedValues(t *testing.T) {
expect := expect.New(t)
spec := typeSpec(expect, `
type Foo interface {
Foo(int, string) (string, error)
}`)
mock, err := mocks.For(spec)
expect(err).To.Be.Nil()
method := mocks.MethodFor(mock, "Foo", method(expect, spec))
expected, err := format.Source([]byte(`
package foo
func (m *mockFoo) Foo(arg0 int, arg1 string) (string, error) {
m.FooCalled <- true
m.FooInput.Arg0 <- arg0
m.FooInput.Arg1 <- arg1
return <-m.FooOutput.Ret0, <-m.FooOutput.Ret1
}`))
expect(err).To.Be.Nil()
src := source(expect, "foo", []ast.Decl{method.Ast()}, nil)
expect(src).To.Equal(string(expected))
}
func main() {
flag.Usage = usage
flag.Parse()
if len(flag.Args()) <= 0 {
fmt.Fprintf(os.Stderr, "no files to parse provided\n")
usage()
}
src, err := ParseFiles(flag.Args())
if err != nil {
log.Fatal(err)
}
var buf bytes.Buffer
if err := src.Generate(&buf); err != nil {
log.Fatal(err)
}
data, err := format.Source(buf.Bytes())
if err != nil {
log.Fatal(err)
}
if *filename == "" {
_, err = os.Stdout.Write(data)
} else {
err = ioutil.WriteFile(*filename, data, 0644)
}
if err != nil {
log.Fatal(err)
}
}
func TestMockMethodParams(t *testing.T) {
expect := expect.New(t)
spec := typeSpec(expect, `
type Foo interface {
Foo(foo, bar string, baz int)
}`)
mock, err := mocks.For(spec)
expect(err).To.Be.Nil()
method := mocks.MethodFor(mock, "Foo", method(expect, spec))
expected, err := format.Source([]byte(`
package foo
func (m *mockFoo) Foo(foo, bar string, baz int) {
m.FooCalled <- true
m.FooInput.Foo <- foo
m.FooInput.Bar <- bar
m.FooInput.Baz <- baz
}`))
expect(err).To.Be.Nil()
src := source(expect, "foo", []ast.Decl{method.Ast()}, nil)
expect(src).To.Equal(string(expected))
}
func writeTemplatedFile(templStr string, data interface{}) (error, []byte) {
buf := new(bytes.Buffer)
template.Must(template.New("some_template").Parse(templStr)).Execute(buf, data)
formatted, err := format.Source(buf.Bytes())
return err, formatted
}
func main() {
certs, err := selectCerts()
if err != nil {
log.Fatal(err)
}
buf := new(bytes.Buffer)
fmt.Fprintf(buf, "// Created by root_darwin_arm_gen --output %s; DO NOT EDIT\n", *output)
fmt.Fprintf(buf, "%s", header)
fmt.Fprintf(buf, "const systemRootsPEM = `\n")
for _, cert := range certs {
b := &pem.Block{
Type: "CERTIFICATE",
Bytes: cert.Raw,
}
if err := pem.Encode(buf, b); err != nil {
log.Fatal(err)
}
}
fmt.Fprintf(buf, "`")
source, err := format.Source(buf.Bytes())
if err != nil {
log.Fatal("source format error:", err)
}
if err := ioutil.WriteFile(*output, source, 0644); err != nil {
log.Fatal(err)
}
}
func GenFiles(out, project, tplStr string, bs []byte) error {
models, apis, err := meta.Load(bs)
if nil != err {
return err
}
if !strings.HasSuffix(out, "/") {
out += "/"
}
path_file := Convert(project, models, apis)
for path, file := range path_file {
if len(file.Models) == 0 && len(file.Apis) == 0 {
continue
}
path = out + path
if err := os.MkdirAll(filepath.Dir(path), os.ModePerm); err != nil {
return err
}
buf := bytes.NewBuffer(*new([]byte))
GenFileContent(tplStr, file, buf)
// bs := wr.Bytes()
bs, err := format.Source(buf.Bytes())
if err != nil {
return err
}
if err := ioutil.WriteFile(path, bs, os.ModePerm); err != nil {
return err
}
}
return nil
}
func main() {
var bb bytes.Buffer
fmt.Fprintf(&bb, "// go run gentest.go\n")
fmt.Fprintf(&bb, "// GENERATED BY THE COMMAND ABOVE; DO NOT EDIT\n\n")
fmt.Fprintf(&bb, "package ipv6_test\n\n")
for _, r := range registries {
resp, err := http.Get(r.url)
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
fmt.Fprintf(os.Stderr, "got HTTP status code %v for %v\n", resp.StatusCode, r.url)
os.Exit(1)
}
if err := r.parse(&bb, resp.Body); err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
fmt.Fprintf(&bb, "\n")
}
b, err := format.Source(bb.Bytes())
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
os.Stdout.Write(b)
}
func Generate(req *plugin.CodeGeneratorRequest) *plugin.CodeGeneratorResponse {
// Begin by allocating a generator. The request and response structures are stored there
// so we can do error handling easily - the response structure contains the field to
// report failure.
g := generator.New()
g.Request = req
g.CommandLineParameters(g.Request.GetParameter())
// Create a wrapped version of the Descriptors and EnumDescriptors that
// point to the file that defines them.
g.WrapTypes()
g.SetPackageNames()
g.BuildTypeNameMap()
g.GenerateAllFiles()
gtest := generator.New()
data, err := proto.Marshal(req)
if err != nil {
g.Error(err, "failed to marshal modified proto")
}
if err := proto.Unmarshal(data, gtest.Request); err != nil {
g.Error(err, "parsing modified proto")
}
if len(gtest.Request.FileToGenerate) == 0 {
gtest.Fail("no files to generate")
}
gtest.CommandLineParameters(gtest.Request.GetParameter())
// Create a wrapped version of the Descriptors and EnumDescriptors that
// point to the file that defines them.
gtest.WrapTypes()
gtest.SetPackageNames()
gtest.BuildTypeNameMap()
gtest.GeneratePlugin(testgen.NewPlugin())
for i := 0; i < len(gtest.Response.File); i++ {
if strings.Contains(*gtest.Response.File[i].Content, `//These tests are generated by github.com/andres-erbsen/protobuf/plugin/testgen`) {
gtest.Response.File[i].Name = proto.String(strings.Replace(*gtest.Response.File[i].Name, ".pb.go", "pb_test.go", -1))
g.Response.File = append(g.Response.File, gtest.Response.File[i])
}
}
for i := 0; i < len(g.Response.File); i++ {
formatted, err := format.Source([]byte(g.Response.File[i].GetContent()))
if err != nil {
g.Error(err, "go format error")
}
fmts := string(formatted)
g.Response.File[i].Content = &fmts
}
return g.Response
}
func main() {
flag.Parse()
zs, err := readWindowsZones()
if err != nil {
log.Fatal(err)
}
sort.Sort(zs)
var v = struct {
URL string
Zs zones
}{
wzURL,
zs,
}
var buf bytes.Buffer
err = template.Must(template.New("prog").Parse(prog)).Execute(&buf, v)
if err != nil {
log.Fatal(err)
}
data, err := format.Source(buf.Bytes())
if err != nil {
log.Fatal(err)
}
err = ioutil.WriteFile(*filename, data, 0644)
if err != nil {
log.Fatal(err)
}
}
// Process takes a Go source file and bumps version declaration according to conf.
// Returns the modified code and a map from identifiers to updated versions and an error, if any.
func (conf Config) Process(filename string, src interface{}) ([]byte, map[string]string, error) {
fset := token.NewFileSet()
file, err := parser.ParseFile(fset, filename, src, parser.ParseComments)
if err != nil {
return nil, nil, err
}
versions, err := conf.ProcessNode(fset, file)
if err != nil {
return nil, nil, err
}
var buf bytes.Buffer
err = printer.Fprint(&buf, fset, file)
if err != nil {
return nil, nil, err
}
out := buf.Bytes()
out, err = format.Source(out)
if err != nil {
return nil, nil, err
}
return out, versions, nil
}
func genzsys() error {
defs := "defs_" + runtime.GOOS + ".go"
f, err := os.Open(defs)
if err != nil {
if os.IsNotExist(err) {
return nil
}
return err
}
f.Close()
cmd := exec.Command("go", "tool", "cgo", "-godefs", defs)
b, err := cmd.Output()
if err != nil {
return err
}
b, err = format.Source(b)
if err != nil {
return err
}
zsys := "zsys_" + runtime.GOOS + ".go"
switch runtime.GOOS {
case "freebsd", "linux":
zsys = "zsys_" + runtime.GOOS + "_" + runtime.GOARCH + ".go"
}
if err := ioutil.WriteFile(zsys, b, 0644); err != nil {
return err
}
return nil
}
func geniana() error {
var bb bytes.Buffer
fmt.Fprintf(&bb, "// go generate gen.go\n")
fmt.Fprintf(&bb, "// GENERATED BY THE COMMAND ABOVE; DO NOT EDIT\n\n")
fmt.Fprintf(&bb, "package ipv6\n\n")
for _, r := range registries {
resp, err := http.Get(r.url)
if err != nil {
return err
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
return fmt.Errorf("got HTTP status code %v for %v\n", resp.StatusCode, r.url)
}
if err := r.parse(&bb, resp.Body); err != nil {
return err
}
fmt.Fprintf(&bb, "\n")
}
b, err := format.Source(bb.Bytes())
if err != nil {
return err
}
if err := ioutil.WriteFile("iana.go", b, 0644); err != nil {
return err
}
return nil
}
// GoFmt returns the Go formated string of the input.
//
// Panics if the format fails.
func GoFmt(buf string) string {
formatted, err := format.Source([]byte(buf))
if err != nil {
panic(fmt.Errorf("%s\nOriginal code:\n%s", err.Error(), buf))
}
return string(formatted)
}