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Diffstat (limited to 'python/vyos/progressbar.py')
-rw-r--r-- | python/vyos/progressbar.py | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/python/vyos/progressbar.py b/python/vyos/progressbar.py new file mode 100644 index 000000000..1793c445b --- /dev/null +++ b/python/vyos/progressbar.py @@ -0,0 +1,70 @@ +# Copyright 2023 VyOS maintainers and contributors <maintainers@vyos.io> +# +# This library is free software; you can redistribute it and/or +# modify it under the terms of the GNU Lesser General Public +# License as published by the Free Software Foundation; either +# version 2.1 of the License, or (at your option) any later version. +# +# This library is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +# Lesser General Public License for more details. +# +# You should have received a copy of the GNU Lesser General Public +# License along with this library. If not, see <http://www.gnu.org/licenses/>. + +import math +import os +import signal +import subprocess +import sys + +from vyos.utils.io import print_error + +class Progressbar: + def __init__(self, step=None): + self.total = 0.0 + self.step = step + def __enter__(self): + # Recalculate terminal width with every window resize. + signal.signal(signal.SIGWINCH, lambda signum, frame: self._update_cols()) + # Disable line wrapping to prevent the staircase effect. + subprocess.run(['tput', 'rmam'], check=False) + self._update_cols() + # Print an empty progressbar with entry. + self.progress(0, 1) + return self + def __exit__(self, exc_type, kexc_val, exc_tb): + # Revert to the default SIGWINCH handler (ie nothing). + signal.signal(signal.SIGWINCH, signal.SIG_DFL) + # Reenable line wrapping. + subprocess.run(['tput', 'smam'], check=False) + def _update_cols(self): + # `os.get_terminal_size()' is fast enough for our purposes. + self.col = max(os.get_terminal_size().columns - 15, 20) + def increment(self): + """ + Stateful progressbar taking the step fraction at init and no input at + callback (for FTP) + """ + if self.step: + if self.total < 1.0: + self.total += self.step + if self.total >= 1.0: + self.total = 1.0 + # Ignore superfluous calls caused by fuzzy FTP size calculations. + self.step = None + self.progress(self.total, 1.0) + def progress(self, done, total): + """ + Stateless progressbar taking no input at init and current progress with + final size at callback (for SSH) + """ + if done <= total: + length = math.ceil(self.col * done / total) + percentage = str(math.ceil(100 * done / total)).rjust(3) + # Carriage return at the end will make sure the line will get overwritten. + print_error(f'[{length * "#"}{(self.col - length) * "_"}] {percentage}%', end='\r') + # Print a newline to make sure the full progressbar doesn't get overwritten by the next line. + if done == total: + print_error() |