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# coding: utf-8 |
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""" |
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Command Wrapper. |
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A command wrapper to get a live output displayed. |
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""" |
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import subprocess |
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import sys |
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from click import echo, style |
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def launch_cmd_displays_output(cmd: list, print_msg: bool = True, print_err: bool = True, |
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err_to_out: bool = False): |
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"""Launch a command and displays conditionally messages and / or errors.""" |
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try: |
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stderr = subprocess.PIPE if err_to_out is False else subprocess.STDOUT |
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result = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=stderr) |
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except Exception as error: |
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raise SystemError('Cannot run the command: {}'.format(error)) |
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_read_messages(result, print_msg) |
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if print_err is True and err_to_out is False: |
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_print_errors(result) |
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return result |
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def verbose(display: bool, message: str): |
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"""Display a message if verbose is On.""" |
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if display is True: |
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echo(style('[VERBOSE]', fg='green') + |
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' {}'.format(message), file=sys.stderr) |
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def _read_messages(result: subprocess.Popen, display: bool = False): |
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"""Print messages sent to the STDOUT.""" |
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for line in result.stdout: |
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line = line.decode() |
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line = line if display is True else '.' |
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sys.stdout.write(line) |
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sys.stdout.write("\n") |
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def _print_errors(result: subprocess.Popen): |
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"""Print messages sent to the STDERR.""" |
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num = 0 |
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for line in result.stderr: |
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err = line.decode() |
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if num == 0: |
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sys.stdout.write(style("Command returned errors :", fg='red')) |
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if num < 5: |
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sys.stdout.write(err) |
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elif num == 5: |
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sys.stdout.write(style('... and more', fg='red')) |
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num += 1 |
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sys.stdout.write("\n") |
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stakkr-org /
stakkr
