// getFile builds the filepath from the TBuf information, and retrieves the
// file from files. If the built filename is not already defined, then it calls
// the os.OpenFile with the correct parameters depending on the state of args.
func getFile(args *internal.ArgType, t *internal.TBuf) (*os.File, error) {
var f *os.File
var err error
// determine filename
var filename = strings.ToLower(t.Name) + args.Suffix
if args.SingleFile {
filename = args.Filename
}
filename = path.Join(args.Path, filename)
// lookup file
f, ok := files[filename]
if ok {
return f, nil
}
// default open mode
mode := os.O_RDWR | os.O_CREATE | os.O_TRUNC
// stat file to determine if file already exists
fi, err := os.Stat(filename)
if err == nil && fi.IsDir() {
return nil, errors.New("filename cannot be directory")
} else if _, ok = err.(*os.PathError); !ok && args.Append && t.TemplateType != internal.XOTemplate {
// file exists so append if append is set and not XO type
mode = os.O_APPEND | os.O_WRONLY
}
// skip
if t.TemplateType == internal.XOTemplate && fi != nil {
return nil, nil
}
// open file
f, err = os.OpenFile(filename, mode, 0666)
if err != nil {
return nil, err
}
// file didn't originally exist, so add package header
if fi == nil || !args.Append {
err = args.TemplateSet().Execute(f, "xo_package.go.tpl", args)
if err != nil {
return nil, err
}
}
// store file
files[filename] = f
return f, nil
}
