elliotchance/gedcom

package q

import (
    "fmt"
    "io"
    "reflect"

    "github.com/elliotchance/gedcom/v39"
)

type GEDCOMFormatter struct {
    Writer io.Writer
}

func (f *GEDCOMFormatter) Write(result interface{}) error {
    // Nil should be treated as a blank document.
    if gedcom.IsNil(result) {
        return nil
    }

    t := reflect.ValueOf(result)
    if t.Kind() == reflect.Slice {
        for i := 0; i < t.Len(); i++ {
            err := f.Write(t.Index(i).Interface())
            if err != nil {
                return err
            }
        }

        return nil
    }

    if x, ok := result.(gedcom.GEDCOMStringer); ok {
        f.Writer.Write([]byte(x.GEDCOMString(0)))

        return nil
    }

    return fmt.Errorf("%s does not implement gedcom.GEDCOMStringer", t.Type())
}