import subprocess as sp
import logging

def blockmesh(case_dir):
    blockmesh_log = logging.getLogger('blockMesh')
    proc = sp.Popen(
        ('blockMesh'),
        cwd=case_dir,
        stdout=sp.PIPE,
        stderr=sp.PIPE,
        text=True,
    )
    for line in proc.stdout:
        blockmesh_log.info(line[:-1])
    for line in proc.stderr:
        blockmesh_log.error(line[:-1])
    code = proc.wait()
    if code != 0:
        log.error('blockMesh failed')
        sys.exit(code)