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Copy pathspinner.py
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64 lines (54 loc) · 1.79 KB
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"""
This module provides a spinning cursor effect for command-line interfaces.
See: https://stackoverflow.com/questions/4995733/how-to-create-a-spinning-command-line-cursor
"""
# pylint: disable=invalid-name
import sys
import time
import threading
class Spinner:
"""
Implements the spinning cursor
"""
busy = False
delay = 0.1
@staticmethod
def spinning_cursor():
"""
A generator that yields a sequence of cursor characters for the spinning animation.
Yields:
str: A cursor character for the spinning animation.
"""
while 1:
for cursor in '|/-\\':
yield cursor
def __init__(self, delay=None):
"""
Initialize a Spinner object with an optional custom delay between cursor frames.
Args:
delay (float, optional): The delay in seconds between cursor frames.
Defaults to None.
"""
self.spinner_generator = self.spinning_cursor()
if delay and float(delay):
self.delay = delay
def spinner_task(self):
"""
The spinning cursor animation task. Writes the cursor character to stdout, flushes,
sleeps for the specified delay, and then backspaces the cursor.
"""
while self.busy:
sys.stdout.write(next(self.spinner_generator))
sys.stdout.flush()
time.sleep(self.delay)
sys.stdout.write('\b')
sys.stdout.flush()
def __enter__(self):
self.busy = True
threading.Thread(target=self.spinner_task).start()
def __exit__(self, exception, value, tb):
self.busy = False
time.sleep(self.delay)
if exception is not None:
return False
return True