def withLoader(loadingMsg: str, loader: Loader, func, *args):
"""
show loading to user for function that take some time.
"""
try:
loader.text = loadingMsg
loader.start()
return func(*args)
finally:
# short hand '{0:<30}{1}'.format(loadingMsg, "success")
loader.complete_text = "{message:{fill}{align}{width}}success".format(
message=loadingMsg, fill=".", align="<", width=30
)
loader.stop()
