sclang communication test

sclang.py

import sys
import subprocess

proc = subprocess.Popen(
    ["sclang", "-i", "scqt"],
    stdin=subprocess.PIPE,
    stdout=subprocess.PIPE,
    stderr=subprocess.STDOUT,
    )

def read_line():
    if proc.returncode is not None:
        sys.exit(0)
    string = proc.stdout.readline().decode("utf-8")
    print(string[:-1])
    return string

def evaluate_code(string):
    raw = string.encode("utf-8") + b"\x1b"
    proc.stdin.write(raw)
    proc.stdin.flush()

evaluate_code(""" "Execution at startup is working".postln; """)
line = read_line()
while "Welcome to" not in line:
    line = read_line()

evaluate_code(""" "Execution at boot is working".postln; """)

read_line()
read_line()