import subprocess

def pdfjam(args: dict, deps, output):
    joining_process = subprocess.Popen(
        ["pdfjam"] +  deps + ["-o", output],
        stdout=subprocess.PIPE,
        stderr=subprocess.PIPE,
        universal_newlines=True,
    )
    # exit_code is always 66...
    exit_code = joining_process.wait()

    if  exit_code == 0:
        yield "pdfjam success"
    else:
        yield "pdfjam failed"