func (ft protoIDLFileType) VerifyFile(f *generator.File, pathname string) error {
log.Printf("Verifying IDL file %q", pathname)
friendlyName := filepath.Join(f.PackageName, f.Name)
b := &bytes.Buffer{}
et := generator.NewErrorTracker(b)
ft.assemble(et, f)
if et.Error() != nil {
return et.Error()
}
formatted := b.Bytes()
existing, err := ioutil.ReadFile(pathname)
if err != nil {
return fmt.Errorf("unable to read file %q for comparison: %v", friendlyName, err)
}
if bytes.Compare(formatted, existing) == 0 {
return nil
}
// Be nice and find the first place where they differ
i := 0
for i < len(formatted) && i < len(existing) && formatted[i] == existing[i] {
i++
}
eDiff, fDiff := existing[i:], formatted[i:]
if len(eDiff) > 100 {
eDiff = eDiff[:100]
}
if len(fDiff) > 100 {
fDiff = fDiff[:100]
}
return fmt.Errorf("output for %q differs; first existing/expected diff: \n %q\n %q", friendlyName, string(eDiff), string(fDiff))
}
func (ft protoIDLFileType) AssembleFile(f *generator.File, pathname string) error {
log.Printf("Assembling IDL file %q", pathname)
destFile, err := os.Create(pathname)
if err != nil {
return err
}
defer destFile.Close()
b := &bytes.Buffer{}
et := generator.NewErrorTracker(b)
ft.assemble(et, f)
if et.Error() != nil {
return et.Error()
}
// TODO: is there an IDL formatter?
_, err = destFile.Write(b.Bytes())
return err
}