package text

import (
    "bytes"
    "fmt"
    "io"
)

// Adds a trailing CRLF on non-zero input which is non-terminated.
func ToLf(crlf []byte) []byte {
    lf, err := io.ReadAll(ToLfReader(bytes.NewReader(crlf)))
    if err != nil {
        panic(err.Error())
    }
    return lf
}

// Zero-byte readers result in zero-byte readers. Otherwise, unterminated lines
// are terminated.
// Sole "\r" are interpreted as a line break (old Mac OS style).
func ToLfReader(r io.Reader) io.Reader {
    return Map(Lf(), r)
}

// Adds a trailing LF on non-zero input which is non-terminated.
func ToCrlf(lf []byte) []byte {
    crlf, err := io.ReadAll(ToCrlfReader(bytes.NewReader(lf)))
    if err != nil {
        panic(fmt.Errorf("linenormalisation: Lf2CrlfAll: %v", err))
    }
    return crlf
}

func ToCrlfReader(r io.Reader) io.Reader {
    return Map(Crlf(), r)
}