knock/lib/run.py

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import click, subprocess, sys
# run a command and display output in a styled terminal
# cleanser is called if the command returns a >0 exit code
def run(command: [str], stdin: str = '', cleanser = lambda: None) -> int:
# newline and set styles
click.secho('', fg='white', bg='black', bold=True, reset=False)
# show command
click.echo('knock> ' + ' '.join(command))
# remove bold
click.secho('', fg='white', bg='black', bold=False, reset=False)
result = subprocess.run(
command,
stderr=subprocess.STDOUT,
input=stdin.encode(),
check=False # don't throw Python error if returncode isn't 0
)
# show returncode in bold, then reset styles
click.secho(f'\nknock[{result.returncode}]>', bold=True)
# newline
click.echo('')
if result.returncode > 0:
cleanser()
click.echo(f'Error: Command returned error code {result.returncode}.', err=True)
sys.exit(1)
return result.returncode