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warn user if python-progressbar is not installed

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On ImportError have_pb_module is false and the class NoPBTextMeter gets
returned which prints "Please install progressbar module..." on TextMeter.start()
This commit is contained in:
Marco Strigl 2019-01-08 14:23:38 +01:00 committed by lethliel
parent 341962f9c0
commit 8a6abe3a6c
1 changed files with 20 additions and 2 deletions
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22
osc/meter.py
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@ -3,10 +3,14 @@
# and distributed under the terms of the GNU General Public Licence, # and distributed under the terms of the GNU General Public Licence,
# either version 2, or (at your option) any later version. # either version 2, or (at your option) any later version.
import progressbar as pb try:
import progressbar as pb
have_pb_module = True
except ImportError:
have_pb_module = False
class TextMeter(object): class PBTextMeter(object):
def start(self, basename, size=None): def start(self, basename, size=None):
if size is None: if size is None:
@ -24,4 +28,18 @@ class TextMeter(object):
def end(self): def end(self):
self.bar.finish() self.bar.finish()
class NoPBTextMeter(object):
def start(self, *args, **kwargs):
print('Please install the progressbar module...')
def update(self, *args, **kwargs):
pass
def end(self, *args, **kwargs):
pass
if have_pb_module:
TextMeter = PBTextMeter
else:
TextMeter = NoPBTextMeter
# vim: sw=4 et # vim: sw=4 et