public static IStreamable MapText(this IStreamable streamable,
Encoding outputEncoding,
Func <string, string> mapper)
{
if (streamable == null)
{
throw new ArgumentNullException(nameof(streamable));
}
if (outputEncoding == null)
{
throw new ArgumentNullException(nameof(outputEncoding));
}
if (mapper == null)
{
throw new ArgumentNullException(nameof(mapper));
}
return(Streamable.Create(() =>
{
var mapped = mapper(streamable.ReadText());
return new MemoryStream(outputEncoding.GetBytes(mapped));
}));
}