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add doc for ESCPOS_CAPABILITIES_FILE

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Patrick Kanzler 2017-03-27 15:30:14 +02:00
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doc/user/usage.rst
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@ -216,6 +216,32 @@ Here you can download an example, that will print a set of common barcodes:
* :download:`barcode.bin </download/barcode.bin>` by `@mike42 <https://github.com/mike42>`_
Advanced Usage: change capabilities-profile
-------------------------------------------
Packaged together with the escpos-code is a capabilities-file. This file in
JSON-format describes the capabilities of different printers. It is developed and hosted in
`escpos-printer-db <https://github.com/receipt-print-hq/escpos-printer-db>`_.
Certain applications like the usage of `cx_freeze <https://cx-freeze.readthedocs.io>`_ might change the
packaging structure. This leads to the capabilities-profile not being found.
In this case you can use the environment-variable `ESCPOS_CAPABILITIES_FILE`.
The following code is an example.
.. code-block:: shell
# use packaged capabilities-profile
python-escpos cut
# use capabilities-profile that you have put in /usr/python-escpos
export ESCPOS_CAPABILITIES_FILE=/usr/python-escpos/capabilities.json
python-escpos cut
# use packaged file again
unset ESCPOS_CAPABILITIES_FILE
python-escpos cut
Hint: preprocess printing
-------------------------