proc.call() and streams

[DavidPerezIngeniero]

Currently, os-lib covers all the needs for launching processes (and simplify everything), except one case, that I describe below.

What about if I want to feed stdin of a process via an OutputStream.
Or collect the stdout via an InputStream.

Certainly, I could use an Array[Byte] or a String, but it makes me hold all the potentially big data in memory.

Scala library has this useful class with no counterpart in os-lib:

ProcessIO(in: (OutputStream) => Unit], out: (InputStream) => Unit, err: (InputStream) => Unit)

https://www.scala-lang.org/api/2.13.3/scala/sys/process/ProcessIO.html

[DavidPerezIngeniero]

Solved by creating an adapter to Writable from a funcion that writes to an OutputStream:

def writeToOutputStream(out: OutputStream) = ...

class AdapterToWritable extends geny.Writable {
	override def writeBytesTo(os: OutputStream) = writeToOutputStream(os)
}

and then using it:

proc("myproc").call(stdin=new AdapterToWritable())