Add Function to Dummy Printer for Clearing Buffer
If you are using the dummy printer, you may want to use the printer
again after sending the output to a physical printer.
This method empties the list of the output buffer.
When executing a tox-run a pickle file will be created. If the docs are
built after the py3 task, it will fail due to incompatible
pickle-protocols.
See https://stackoverflow.com/a/25843743/4244236 for reference.
* add a method to check barcode code format
ensure that the code to print is compatible with the ESC/POS formats and
also automatically check this format before printing (barcode() method).
* rewrite test using pytest's parametrize functionality
* add test for the 'check' argument
* update authors list
The feature use_coverage of hypothesis caused the failing tests, because
the printer_file_test is sensitive to the coverage analysis of
hypothesis.
Fixed by disabling use_coverage for the crashing tests
hypothesis introduced a regression in 3.29.0 (or at least changed
behaviour). Until I have found the problem I will pin it to the last
working version.
Also two tests should be prevented from failing when they are slow.
This was tested on ZJ-5890 with success. By default centering is
deactivated for backward compatibility. Trying to center a QR code in
native mode will raise an exception as we do not know ATM if the native
rendering is centered by default or not.
* Added basic tests for center feature
* Check image size before centering
On a RaspberryPi it's taking 10 seconds to simply run:
import escpos.printer
This change creates a pickle file that will load 20x faster. The
rationale is that the capabilities.json file doesn't change too often.
Also changed some imports for PEP8.
