Merge pull request #298 from python-escpos/development

release v3.0a4
update changelog
2025-09-13 09:09:58 +00:00 · 2018-05-15 23:12:17 +02:00 · 2018-05-15 22:48:33 +02:00 · 2018-05-15 22:07:12 +02:00 · 2018-05-15 01:03:07 +02:00 · 2018-05-15 00:34:43 +02:00
54 changed files with 1646 additions and 330 deletions
--- a/.gitignore
+++ b/.gitignore
@@ -20,6 +20,12 @@ dist/
 .coverage
 src/escpos/version.py
 .hypothesis
+.pytest_cache/

 # testing temporary directories
 test/test-cli-output/
+
+# vim swap files
+*.swp
+*.swn
+*.swo
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,4 @@
 [submodule "capabilities-data"]
 	path = capabilities-data
 	url = https://github.com/receipt-print-hq/escpos-printer-db.git
+	branch = master
--- a/.mailmap
+++ b/.mailmap
@@ -0,0 +1,14 @@
+<dev@pkanzler.de>                                    <patrick.kanzler@fablab.fau.de>
+<manpaz@gmail.com>                                   <manpaz@bashlinux.com>
+Manuel F Martinez <manpaz@gmail.com>                 manpaz <manpaz@bashlinux.com>
+<emailofdavis@gmail.com>                             <davis.goglin@oregonicecream.com>
+Davis Goglin <emailofdavis@gmail.com>                davisgoglin <emailofdavis@gmail.com>
+Michael Billington <michael.billington@gmail.com>    Michael <michael.billington@gmail.com>
+Cody (Quantified Code Bot) <cody@quantifiedcode.com> Cody <cody@quantifiedcode.com>
+Renato Lorenzi <renato.lorenzi@senior.com.br>        Renato.Lorenzi <renato.lorenzi@senior.com.br>
+Ahmed Tahri <nyuubi.10@gmail.com>                    TAHRI Ahmed <nyuubi.10@gmail.com>
+Michael Elsdörfer <michael@elsdoerfer.com>           Michael Elsdörfer <michael@elsdoerfer.info>
+Juanmi Taboada <juanmi@juanmitaboada.com>            Juanmi Taboada <juanmi@juanmitaboada.com>
+csoft2k <csoft2k@hotmail.com>
+Sergio Pulgarin <sergio.pulgarin@gmail.com>
+reck31 <rakesh.gunduka@gmail.com>
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,16 +1,19 @@
 language: python
 sudo: false
 cache: pip
+git:
+  depth: 100000
 addons:
  apt:
    packages:
      - graphviz
+env:
+  global:
+    - ESCPOS_CAPABILITIES_FILE=/home/travis/build/python-escpos/python-escpos/capabilities-data/dist/capabilities.json
 matrix:
  include:
    - python: 2.7
      env: TOXENV=py27
-    - python: 3.3
-      env: TOXENV=py33
    - python: 3.4
      env: TOXENV=py34
    - python: 3.5
@@ -19,6 +22,8 @@ matrix:
      env: TOXENV=py36
    - python: 3.6-dev
      env: TOXENV=py36
+    - python: 3.7-dev
+      env: TOXENV=py37
    - python: nightly
      env: TOXENV=py37
    - python: pypy
@@ -29,14 +34,16 @@ matrix:
      env: TOXENV=docs
    - python: 2.7
      env: TOXENV=flake8
-    - python: 3.5
+    - python: 3.6
      env: TOXENV=flake8
  allow_failures:
    - python: 3.6-dev
+    - python: 3.7-dev
    - python: nightly
    - python: pypy3
 before_install:
    - pip install tox codecov 'sphinx>=1.5.1'
+    - ./doc/generate_authors.sh --check
 script:
    - tox
    - codecov
@@ -44,3 +51,16 @@ notifications:
  email:
    on_success: never
    on_failure: change
+deploy:
+# Github deployment
+  - provider: releases
+    api_key:
+      secure: oiR3r5AIx9ENIRtbUKIxorRx8GMv4BxgVIZcieXbgSTN4DBZdRWdzs1Xxngu/90Xf79G0X+XGxZyXrYN7eFFNp0kUYj8kwZ1aS/dyR88scskumERWi1Hv5WUJrYGrDe7PcjNGsJ2jw0nNnRPKG87Y84aR4lQygyGBSlDcdrOBnBv0sHYJMxRvHSRkGgWpur06QIOGOk4oOipTXR/7E9cg3YQC5nvZAf2QiprwTa8IcOSFlZQPykEVRYSiAgXrgqBYcZzpX0hAGuIBv7DmPI2ORTF+t79Wbhxhnho3gGJleDv7Z96//sf1vQNCG6qOgeIc9ZY08Jm1AwXQoW0p6F1/XcEPxeyPDkXJzlojE9rjYNLCPL4gxb/LESEuUafm0U4JGMsZ6hnsBOw583yTuAdfQuJ9M+QaSyem6OVNkky3+DKAD3z0WJnl9jmGXIXigNSIxD25XhpvY+j9P0XTLBG1GT2Q+wXCIjSYJc2XnYcdgVJcLoxSWk1fKj/KPi7buAWtqwnL3tjeldpMMOZMliPUTWMM14zoGskHztt0JCkAtcotm9AQtvL8eZ2LHLDK/jyLzjv0wAwU5vzSVp14XHLZl7Q0AIoNc20p1EYGa9C/gSPd9CkrWZoG4lMOiAu3tp2PRLVrdXH3ZWSPQq4Ek5MczrUTkmB82XErNbOa8QB1Dw=
+    file: .tox/dist/python-escpos*.zip
+    file_glob: true
+    skip_cleanup: true
+    on:
+      tags: true
+      repo: python-escpos/python-escpos
+      branch: master
+      condition: $TRAVIS_PYTHON_VERSION = "3.6"
--- a/33
+++ b/33
@@ -0,0 +1,33 @@
+Ahmed Tahri
+Asuki Kono
+belono
+Christoph Heuel
+Cody (Quantified Code Bot)
+csoft2k
+Curtis // mashedkeyboard
+Davis Goglin
+Dean Rispin
+Dmytro Katyukha
+Hark
+Joel Lehtonen
+kennedy
+Kristi
+ldos
+Lucy Linder
+Manuel F Martinez
+Michael Billington
+Michael Elsdörfer
+mrwunderbar666
+Nathan Bookham
+Patrick Kanzler
+primax79
+Qian Linfeng
+reck31
+Renato Lorenzi
+Romain Porte
+Sam Cheng
+Sergio Pulgarin
+Stephan Sokolow
+Thijs Triemstra
+Thomas van den Berg
+ysuolmai
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -1,6 +1,97 @@
 *********
 Changelog
 *********
+2018-05-15 - Version 3.0a4 - "Kakistocrat"
+------------------------------------------
+This release is the fifth alpha release of the new version 3.0. Please
+be aware that the API will still change until v3.0 is released.
+
+changes
+^^^^^^^
+- raise exception when TypeError occurs in cashdraw (#268)
+- Feature/clear content in dummy printer (#271)
+- fix is_online() (#282)
+- improve documentation
+- Modified submodule to always pull from master branch (#283)
+- parameter for implementation of nonnative qrcode (#289)
+- improve platform independence (#296)
+
+contributors
+^^^^^^^^^^^^
+- Christoph Heuel
+- Patrick Kanzler
+- kennedy
+- primax79
+- reck31
+- Thijs Triemstra
+
+2017-10-08 - Version 3.0a3 - "Just Testing"
+-------------------------------------------
+This release is the fourth alpha release of the new version 3.0. Please
+be aware that the API will still change until v3.0 is released.
+
+changes
+^^^^^^^
+- minor changes in documentation, tests and examples
+- pickle capabilities for faster startup
+- first implementation of centering images and QR
+- check barcodes based on regex
+
+contributors
+^^^^^^^^^^^^
+- Patrick Kanzler
+- Lucy Linder
+- Romain Porte
+- Sergio Pulgarin
+
+2017-08-04 - Version 3.0a2 - "It's My Party And I'll Sing If I Want To"
+-----------------------------------------------------------------------
+This release is the third alpha release of the new version 3.0. Please
+be aware that the API will still change until v3.0 is released.
+
+changes
+^^^^^^^
+- refactor of the set-method
+- preliminary support of POS "line display" printing
+- improvement of tests
+- added ImageWidthError
+- list authors in repository
+- add support for software-based barcode-rendering
+- fix SerialException when trying to close device on __del__
+- added the DLE EOT querying command for USB and Serial
+- ensure QR codes have a large enough border
+- make feed for cut optional
+- fix the behavior of horizontal tabs
+- added test script for hard an soft barcodes
+- implemented paper sensor querying command
+- added weather forecast example script
+- added a method for simpler newlines
+
+contributors
+^^^^^^^^^^^^
+- csoft2k
+- Patrick Kanzler
+- mrwunderbar666
+- Romain Porte
+- Ahmed Tahri
+
+2017-03-29 - Version 3.0a1 - "Headcrash"
+----------------------------------------
+This release is the second alpha release of the new version 3.0. Please
+be aware that the API will still change until v3.0 is released.
+
+changes
+^^^^^^^
+- automatically upload releases to GitHub
+- add environment variable ESCPOS_CAPABILITIES_FILE
+- automatically handle cases where full cut or partial cut is not available
+- add print_and_feed
+
+contributors
+^^^^^^^^^^^^
+- Sam Cheng
+- Patrick Kanzler
+- Dmytro Katyukha

 2017-01-31 - Version 3.0a - "Grey Area"
 ---------------------------------------
--- a/CONTRIBUTING.rst
+++ b/CONTRIBUTING.rst
@@ -12,6 +12,16 @@ The pull requests and issues will be prefilled with templates. Please fill in yo
 This project uses `semantic versioning <http://semver.org/>`_ and tries to adhere to the proposed rules as
 well as possible.

+Author-list
+-----------
+
+This project keeps a list of authors. This can be auto-generated by calling `./doc/generate-authors.sh`.
+When contributing the first time, please include a commit with the output of this script in place.
+Otherwise the integration-check will fail.
+
+When you change your username or mail-address, please also update the `.mailmap` and the authors-list.
+You can find a good documentation on the mapping-feature in the `documentation of git-shortlog <https://git-scm.com/docs/git-shortlog#_mapping_authors>`_.
+
 Style-Guide
 -----------

@@ -38,9 +48,11 @@ Often you can achieve compatibility quite easily with a tool from the `six`-pack

 PEP8
 ^^^^
-This is not yet consequently done in every piece of code, but please try to ensure
-that your code honors PEP8.
-The checks by Landscape and QuantifiedCode that run on every PR will provide you with hints.
+The entire codebase adheres to the rules of PEP8.
+These rules are enforced by running `flake8` in the integration-checks.
+Please adhere to these rules as your contribution can only be merged if the check succeeds.
+You can use flake8 or similar tools locally in order to check your code.
+Apart from that the travis-log and the check by Landscape will provide you with hints.

 GIT
 ^^^
--- a/README.rst
+++ b/README.rst
@@ -6,10 +6,6 @@ python-escpos - Python library to manipulate ESC/POS Printers
    :target: https://travis-ci.org/python-escpos/python-escpos
    :alt: Continous Integration

-.. image:: https://www.quantifiedcode.com/api/v1/project/95748b89a3974700800b85e4ed3d32c4/badge.svg
-    :target: https://www.quantifiedcode.com/app/project/95748b89a3974700800b85e4ed3d32c4
-    :alt: Code issues
-
 .. image:: https://landscape.io/github/python-escpos/python-escpos/master/landscape.svg?style=flat
    :target: https://landscape.io/github/python-escpos/python-escpos/master
    :alt: Code Health
@@ -47,10 +43,11 @@ Dependencies

 This library makes use of:

-    * pyusb for USB-printers
-    * Pillow for image printing
-    * qrcode for the generation of QR-codes
-    * pyserial for serial printers
+* `pyusb <https://github.com/walac/pyusb>`_ for USB-printers
+* `Pillow <https://github.com/python-pillow/Pillow>`_ for image printing
+* `qrcode <https://github.com/lincolnloop/python-qrcode>`_ for the generation of QR-codes
+* `pyserial <https://github.com/pyserial/pyserial>`_ for serial printers
+* `viivakoodi <https://github.com/kxepal/viivakoodi>`_ for the generation of barcodes

 Documentation and Usage
 -----------------------
@@ -73,4 +70,13 @@ The full project-documentation is available on `Read the Docs <https://python-es
 Contributing
 ------------

-This project is open for any contribution! Please see CONTRIBUTING.rst for more information.
+This project is open for any contribution! Please see `CONTRIBUTING.rst <http://python-escpos.readthedocs.io/en/latest/dev/contributing.html>`_ for more information.
+
+
+Disclaimer
+----------
+
+None of the vendors cited in this project agree or endorse any of the patterns or implementations.
+Its names are used only to maintain context.
+
+
--- a/2
+++ b/2
--- a/codecov.yml
+++ b/codecov.yml
@@ -7,10 +7,6 @@ coverage:
      default:  # status context
        target: auto
        threshold: "1%"
-    patch:
-      default:
-        target: auto
-        threshold: "1%"
  range: "60...100"

 comment: off
--- a/doc/generate_authors.sh
+++ b/doc/generate_authors.sh
@@ -0,0 +1,19 @@
+#!/bin/sh
+
+GENLIST=$(git shortlog -s -n | cut -f2 | sort -f)
+AUTHORSFILE="$(dirname $0)/../AUTHORS"
+TEMPAUTHORSFILE="/tmp/python-escpos-authorsfile"
+
+if [ "$#" -eq 1 ]
+    then
+        echo "$GENLIST">$TEMPAUTHORSFILE
+	echo "\nAuthorsfile in version control:\n"
+	cat $AUTHORSFILE
+	echo "\nNew authorsfile:\n"
+	cat $TEMPAUTHORSFILE
+	echo "\nUsing diff on files...\n"
+        diff -q --from-file $AUTHORSFILE $TEMPAUTHORSFILE
+    else
+	echo "$GENLIST">$AUTHORSFILE
+fi
+
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -5,3 +5,4 @@ pyserial
 sphinx-rtd-theme
 setuptools-scm
 docutils>=0.12
+viivakoodi
--- a/doc/user/usage.rst
+++ b/doc/user/usage.rst
@@ -1,6 +1,7 @@
 *****
 Usage
 *****
+:Last Reviewed: 2017-06-10

 Define your printer
 -------------------
@@ -157,10 +158,12 @@ The printer section

 The ``printer`` configuration section defines a default printer to create.

-The only required paramter is ``type``. The value of this should be one of the
+The only required paramter is ``type``. The value of this has to be one of the
 printers defined in :doc:`/user/printers`.

-The rest of the parameters are whatever you want to pass to the printer.
+The rest of the given parameters will be passed on to the initialization of the printer class.
+Use these to overwrite the default values as specified in :doc:`/user/printers`.
+This implies that the parameters have to match the parameter-names of the respective printer class.

 An example file printer::

@@ -171,10 +174,19 @@ An example file printer::
 And for a network printer::

    printer:
-                type: network
+            type: Network
            host: 127.0.0.1
            port: 9000

+An USB-printer could be defined by::
+
+    printer:
+            type: Usb
+            idVendor: 0x1234
+            idProduct: 0x5678
+            in_ep: 0x66
+            out_ep: 0x01
+
 Printing text right
 -------------------
 Python-escpos is designed to accept unicode. So make sure that you use ``u'strings'`` or import ``unicode_literals``
@@ -216,6 +228,32 @@ 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
 -------------------------

--- a/examples/barcodes.py
+++ b/examples/barcodes.py
@@ -0,0 +1,11 @@
+from escpos.printer import Usb
+
+
+# Adapt to your needs
+p = Usb(0x0416, 0x5011, profile="POS-5890")
+
+# Print software and then hardware barcode with the same content
+p.soft_barcode('code39', '123456')
+p.text('\n')
+p.text('\n')
+p.barcode('123456', 'CODE39')
--- a/examples/codepage_tables.py
+++ b/examples/codepage_tables.py
@@ -37,14 +37,14 @@ def print_codepage(printer, codepage):
    sep = ""

    # Table header
-    printer.set(text_type='B')
+    printer.set(font='b')
    printer._raw("  {}\n".format(sep.join(map(lambda s: hex(s)[2:], range(0, 16)))))
    printer.set()

    # The table
    for x in range(0, 16):
        # First column
-        printer.set(text_type='B')
+        printer.set(font='b')
        printer._raw("{} ".format(hex(x)[2:]))
        printer.set()

--- a/examples/graphics/climacons/clear-day.png
+++ b/examples/graphics/climacons/clear-day.png
--- a/examples/graphics/climacons/clear-night.png
+++ b/examples/graphics/climacons/clear-night.png
--- a/examples/graphics/climacons/cloudy.png
+++ b/examples/graphics/climacons/cloudy.png
--- a/examples/graphics/climacons/fog.png
+++ b/examples/graphics/climacons/fog.png
--- a/examples/graphics/climacons/partly-cloudy-day.png
+++ b/examples/graphics/climacons/partly-cloudy-day.png
--- a/examples/graphics/climacons/partly-cloudy-night.png
+++ b/examples/graphics/climacons/partly-cloudy-night.png
--- a/examples/graphics/climacons/rain.png
+++ b/examples/graphics/climacons/rain.png
--- a/examples/graphics/climacons/readme.md
+++ b/examples/graphics/climacons/readme.md
@@ -0,0 +1,10 @@
+# Climacons by Adam Whitcroft
+
+75 climatically categorised pictographs for web and UI design by [@adamwhitcroft](http://www.twitter.com/#!/adamwhitcroft).
+
+Visit the [Climacons](http://adamwhitcroft.com/climacons/) website for more information.
+
+Visit [Adam Whitcroft on GitHub](https://github.com/AdamWhitcroft)
+
+## License
+You are free to use any of the Climacons Icons (the "icons") in any personal or commercial work without obligation of payment (monetary or otherwise) or attribution, however a credit for the work would be appreciated. **Do not** redistribute or sell and **do not** claim creative credit. Intellectual property rights are not transferred with the download of the icons.
--- a/examples/graphics/climacons/sleet.png
+++ b/examples/graphics/climacons/sleet.png
--- a/examples/graphics/climacons/snow.png
+++ b/examples/graphics/climacons/snow.png
--- a/examples/graphics/climacons/wind.png
+++ b/examples/graphics/climacons/wind.png
--- a/examples/qr_code.py
+++ b/examples/qr_code.py
@@ -0,0 +1,19 @@
+import sys
+
+from escpos.printer import Usb
+
+
+def usage():
+    print("usage: qr_code.py <content>")
+
+
+if __name__ == '__main__':
+    if len(sys.argv) != 2:
+        usage()
+        sys.exit(1)
+
+    content = sys.argv[1]
+
+    # Adapt to your needs
+    p = Usb(0x0416, 0x5011, profile="POS-5890")
+    p.qr(content, center=True)
--- a/examples/software_barcode.py
+++ b/examples/software_barcode.py
@@ -0,0 +1,9 @@
+from escpos.printer import Usb
+
+
+# Adapt to your needs
+p = Usb(0x0416, 0x5011, profile="POS-5890")
+
+# Some software barcodes
+p.soft_barcode('code128', 'Hello')
+p.soft_barcode('code39', '123456')
--- a/examples/weather.py
+++ b/examples/weather.py
@@ -0,0 +1,127 @@
+#!/usr/bin/python
+
+
+# Adapted script from Adafruit
+# Weather forecast for Raspberry Pi w/Adafruit Mini Thermal Printer.
+# Retrieves data from DarkSky.net's API, prints current conditions and
+# forecasts for next two days.
+# Weather example using nice bitmaps.
+# Written by Adafruit Industries.  MIT license.
+# Adapted and enhanced for escpos library by MrWunderbar666
+
+# Icons taken from http://adamwhitcroft.com/climacons/
+# Check out his github: https://github.com/AdamWhitcroft/climacons
+
+
+from __future__ import print_function
+from datetime import datetime
+import calendar
+import urllib
+import json
+import time
+import os
+
+from escpos.printer import Usb
+
+""" Setting up the main pathing """
+this_dir, this_filename = os.path.split(__file__)
+GRAPHICS_PATH = os.path.join(this_dir, "graphics/climacons/")
+
+# Adapt to your needs
+printer = Usb(0x0416, 0x5011, profile="POS-5890")
+
+# You can get your API Key on www.darksky.net and register a dev account.
+# Technically you can use any other weather service, of course :)
+API_KEY = "YOUR API KEY"
+
+LAT = "22.345490"       # Your Location
+LONG = "114.189945"     # Your Location
+
+
+def forecast_icon(idx):
+    icon = data['daily']['data'][idx]['icon']
+    image = GRAPHICS_PATH + icon + ".png"
+    return image
+
+
+# Dumps one forecast line to the printer
+def forecast(idx):
+    date = datetime.fromtimestamp(int(data['daily']['data'][idx]['time']))
+    day = calendar.day_name[date.weekday()]
+    lo = data['daily']['data'][idx]['temperatureMin']
+    hi = data['daily']['data'][idx]['temperatureMax']
+    cond = data['daily']['data'][idx]['summary']
+    print(date)
+    print(day)
+    print(lo)
+    print(hi)
+    print(cond)
+    time.sleep(1)
+    printer.set(
+        font='a',
+        height=2,
+        align='left',
+        bold=False,
+        double_height=False)
+    printer.text(day + ' \n ')
+    time.sleep(5)           # Sleep to prevent printer buffer overflow
+    printer.text('\n')
+    printer.image(forecast_icon(idx))
+    printer.text('low ' + str(lo))
+    printer.text(deg)
+    printer.text('\n')
+    printer.text(' high ' + str(hi))
+    printer.text(deg)
+    printer.text('\n')
+    # take care of pesky unicode dash
+    printer.text(cond.replace(u'\u2013', '-').encode('utf-8'))
+    printer.text('\n \n')
+
+
+def icon():
+    icon = data['currently']['icon']
+    image = GRAPHICS_PATH + icon + ".png"
+    return image
+
+
+deg = ' C'      # Degree symbol on thermal printer, need to find a better way to use a proper degree symbol
+
+# if you want Fahrenheit change units= to 'us'
+url = "https://api.darksky.net/forecast/" + API_KEY + "/" + LAT + "," + LONG + \
+    "?exclude=[alerts,minutely,hourly,flags]&units=si"  # change last bit to 'us' for Fahrenheit
+response = urllib.urlopen(url)
+data = json.loads(response.read())
+
+printer.print_and_feed(n=1)
+printer.control("LF")
+printer.set(font='a', height=2, align='center', bold=True, double_height=True)
+printer.text("Weather Forecast")
+printer.text("\n")
+printer.set(align='center')
+
+
+# Print current conditions
+printer.set(font='a', height=2, align='center', bold=True, double_height=False)
+printer.text('Current conditions: \n')
+printer.image(icon())
+printer.text("\n")
+
+printer.set(font='a', height=2, align='left', bold=False, double_height=False)
+temp = data['currently']['temperature']
+cond = data['currently']['summary']
+printer.text(temp)
+printer.text(' ')
+printer.text(deg)
+printer.text(' ')
+printer.text('\n')
+printer.text('Sky: ' + cond)
+printer.text('\n')
+printer.text('\n')
+
+# Print forecast
+printer.set(font='a', height=2, align='center', bold=True, double_height=False)
+printer.text('Forecast: \n')
+forecast(0)
+forecast(1)
+printer.cut()
+printer.control("LF")
--- a/setup.py
+++ b/setup.py
@@ -3,7 +3,6 @@
 import os
 import sys
 from setuptools import find_packages, setup
-from setuptools.command.test import test as test_command


 base_dir = os.path.dirname(__file__)
@@ -19,33 +18,6 @@ def read(fname):
    return open(os.path.join(os.path.dirname(__file__), fname)).read()


-class Tox(test_command):
-    """proxy class that enables tox to be run with setup.py test"""
-    user_options = [('tox-args=', 'a', "Arguments to pass to tox")]
-
-    def initialize_options(self):
-        """initialize the user-options"""
-        test_command.initialize_options(self)
-        self.tox_args = None
-
-    def finalize_options(self):
-        """finalize user-options"""
-        test_command.finalize_options(self)
-        self.test_args = []
-        self.test_suite = True
-
-    def run_tests(self):
-        """run tox and pass on user-options"""
-        # import here, cause outside the eggs aren't loaded
-        import tox
-        import shlex
-        args = self.tox_args
-        if args:
-            args = shlex.split(self.tox_args)
-        errno = tox.cmdline(args=args)
-        sys.exit(errno)
-
-
 setuptools_scm_template = """\
 # coding: utf-8
 # file generated by setuptools_scm
@@ -68,7 +40,6 @@ setup(
    url='https://github.com/python-escpos/python-escpos',
    download_url='https://github.com/python-escpos/python-escpos/archive/master.zip',
    description='Python library to manipulate ESC/POS Printers',
-    bugtrack_url='https://github.com/python-escpos/python-escpos/issues',
    license='MIT',
    long_description=read('README.rst'),
    author='Manuel F Martinez and others',
@@ -97,9 +68,10 @@ setup(
        'Programming Language :: Python :: 2',
        'Programming Language :: Python :: 2.7',
        'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.3',
        'Programming Language :: Python :: 3.4',
        'Programming Language :: Python :: 3.5',
+        'Programming Language :: Python :: 3.6',
+        'Programming Language :: Python :: 3.7',
        'Programming Language :: Python :: Implementation :: CPython',
        'Programming Language :: Python :: Implementation :: PyPy',
        'Topic :: Software Development :: Libraries :: Python Modules',
@@ -112,10 +84,11 @@ setup(
        'pyserial',
        'six',
        'appdirs',
-        'pyyaml',
+        'PyYAML',
        'argparse',
        'argcomplete',
-        'future'
+        'future',
+        'viivakoodi>=0.8'
    ],
    setup_requires=[
        'setuptools_scm',
@@ -123,16 +96,15 @@ setup(
    tests_require=[
        'jaconv',
        'tox',
-        'pytest',
+        'pytest!=3.2.0,!=3.3.0',
        'pytest-cov',
        'pytest-mock',
        'nose',
        'scripttest',
        'mock',
-        'hypothesis',
+        'hypothesis!=3.56.9',
        'flake8'
    ],
-    cmdclass={'test': Tox},
    entry_points={
        'console_scripts': [
            'python-escpos = escpos.cli:main'
--- a/src/escpos/capabilities.py
+++ b/src/escpos/capabilities.py
@@ -1,17 +1,54 @@
 import re
+from os import environ, path
+import pickle
+import logging
+import time
+
 import six
-from os import path
 import yaml

+from tempfile import gettempdir
+import platform
+
+logging.basicConfig()
+logger = logging.getLogger(__name__)
+
+pickle_dir = environ.get('ESCPOS_CAPABILITIES_PICKLE_DIR', gettempdir())
+pickle_path = path.join(pickle_dir, '{v}.capabilities.pickle'.format(v=platform.python_version()))
+capabilities_path = environ.get(
+    'ESCPOS_CAPABILITIES_FILE',
+    path.join(path.dirname(__file__), 'capabilities.json'))
+
 # Load external printer database
-with open(path.join(path.dirname(__file__), 'capabilities.json')) as f:
-    CAPABILITIES = yaml.load(f)
+t0 = time.time()
+logger.debug('Using capabilities from file: %s', capabilities_path)
+if path.exists(pickle_path):
+    if path.getmtime(capabilities_path) > path.getmtime(pickle_path):
+        logger.debug('Found a more recent capabilities file')
+        full_load = True
+    else:
+        full_load = False
+        logger.debug('Loading capabilities from pickle in %s', pickle_path)
+        with open(pickle_path, 'rb') as cf:
+            CAPABILITIES = pickle.load(cf)
+else:
+    logger.debug('Capabilities pickle file not found: %s', pickle_path)
+    full_load = True
+
+if full_load:
+    logger.debug('Loading and pickling capabilities')
+    with open(capabilities_path) as cp, open(pickle_path, 'wb') as pp:
+        CAPABILITIES = yaml.load(cp)
+        pickle.dump(CAPABILITIES, pp, protocol=2)
+
+logger.debug('Finished loading capabilities took %.2fs', time.time() - t0)
+

 PROFILES = CAPABILITIES['profiles']


 class NotSupported(Exception):
-    """Raised if a requested feature is not suppored by the
+    """Raised if a requested feature is not supported by the
    printer profile.
    """
    pass
@@ -54,7 +91,7 @@ class BaseProfile(object):
        return self.features.get(feature)

    def get_code_pages(self):
-        """Return the support code pages as a {name: index} dict.
+        """Return the support code pages as a ``{name: index}`` dict.
        """
        return {v: k for k, v in self.codePages.items()}

--- a/src/escpos/cli.py
+++ b/src/escpos/cli.py
@@ -100,6 +100,12 @@ ESCPOS_COMMANDS = [
                'option_strings': ('--content',),
                'help': 'Text to print as a qr code',
                'required': True,
+            },
+            {
+                'option_strings': ('--size',),
+                'help': 'QR code size (1-16) [default:3]',
+                'required': False,
+                'type': int,
            }
        ],
    },
--- a/src/escpos/constants.py
+++ b/src/escpos/constants.py
@@ -64,6 +64,11 @@ _PANEL_BUTTON = lambda n: ESC + b'c5' + six.int2byte(n)
 PANEL_BUTTON_ON = _PANEL_BUTTON(0)  # enable all panel buttons
 PANEL_BUTTON_OFF = _PANEL_BUTTON(1)  # disable all panel buttons

+# Line display printing
+LINE_DISPLAY_OPEN = ESC + b'\x3d\x02'
+LINE_DISPLAY_CLEAR = ESC + b'\x40'
+LINE_DISPLAY_CLOSE = ESC + b'\x3d\x01'
+
 # Sheet modes
 SHEET_SLIP_MODE = ESC + b'\x63\x30\x04'  # slip paper
 SHEET_ROLL_MODE = ESC + b'\x63\x30\x01'  # paper roll
@@ -71,51 +76,90 @@ SHEET_ROLL_MODE = ESC + b'\x63\x30\x01'  # paper roll
 # Text format
 # TODO: Acquire the "ESC/POS Application Programming Guide for Paper Roll
 #       Printers" and tidy up this stuff too.
-TXT_FLIP_ON    = ESC + b'\x7b\x01'
-TXT_FLIP_OFF   = ESC + b'\x7b\x00'
-TXT_SMOOTH_ON  = GS + b'\x62\x01'
-TXT_SMOOTH_OFF = GS + b'\x62\x00'
 TXT_SIZE       = GS + b'!'
-TXT_WIDTH      = {1: 0x00,
-                  2: 0x10,
-                  3: 0x20,
-                  4: 0x30,
-                  5: 0x40,
-                  6: 0x50,
-                  7: 0x60,
-                  8: 0x70}
-TXT_HEIGHT     = {1: 0x00,
+
+TXT_NORMAL     = ESC + b'!\x00'     # Normal text
+
+
+TXT_STYLE = {
+    'bold': {
+        False: ESC + b'\x45\x00',               # Bold font OFF
+        True: ESC + b'\x45\x01'                 # Bold font ON
+    },
+    'underline': {
+        0: ESC + b'\x2d\x00',                   # Underline font OFF
+        1: ESC + b'\x2d\x01',                   # Underline font 1-dot ON
+        2: ESC + b'\x2d\x02'                    # Underline font 2-dot ON
+    },
+    'size': {
+        'normal': TXT_NORMAL + ESC + b'!\x00',  # Normal text
+        '2h': TXT_NORMAL + ESC + b'!\x10',      # Double height text
+        '2w': TXT_NORMAL + ESC + b'!\x20',      # Double width text
+        '2x': TXT_NORMAL + ESC + b'!\x30'       # Quad area text
+    },
+    'font': {
+        'a': ESC + b'\x4d\x00',                 # Font type A
+        'b': ESC + b'\x4d\x00'                  # Font type B
+    },
+    'align': {
+        'left': ESC + b'\x61\x00',              # Left justification
+        'center': ESC + b'\x61\x01',            # Centering
+        'right': ESC + b'\x61\x02'              # Right justification
+    },
+    'invert': {
+        True: GS  + b'\x42\x01',                # Inverse Printing ON
+        False: GS  + b'\x42\x00'                # Inverse Printing OFF
+    },
+    'color': {
+        'black': ESC + b'\x72\x00',             # Default Color
+        'red': ESC + b'\x72\x01'                # Alternative Color, Usually Red
+    },
+    'flip': {
+        True: ESC + b'\x7b\x01',                # Flip ON
+        False: ESC + b'\x7b\x00'                # Flip OFF
+    },
+    'density': {
+        0: GS + b'\x7c\x00',                    # Printing Density -50%
+        1: GS + b'\x7c\x01',                    # Printing Density -37.5%
+        2: GS + b'\x7c\x02',                    # Printing Density -25%
+        3: GS + b'\x7c\x03',                    # Printing Density -12.5%
+        4: GS + b'\x7c\x04',                    # Printing Density  0%
+        5: GS + b'\x7c\x08',                    # Printing Density +50%
+        6: GS + b'\x7c\x07',                    # Printing Density +37.5%
+        7: GS + b'\x7c\x06',                    # Printing Density +25%
+        8: GS + b'\x7c\x05'                     # Printing Density +12.5%
+    },
+    'smooth': {
+        True: GS + b'\x62\x01',                 # Smooth ON
+        False: GS + b'\x62\x00'                 # Smooth OFF
+    },
+    'height': {                                 # Custom text height
+        1: 0x00,
        2: 0x01,
        3: 0x02,
        4: 0x03,
        5: 0x04,
        6: 0x05,
        7: 0x06,
-                  8: 0x07}
-TXT_NORMAL     = ESC + b'!\x00'     # Normal text
-TXT_2HEIGHT    = ESC + b'!\x10'     # Double height text
-TXT_2WIDTH     = ESC + b'!\x20'     # Double width text
-TXT_4SQUARE    = ESC + b'!\x30'     # Quad area text
-TXT_UNDERL_OFF = ESC + b'\x2d\x00'  # Underline font OFF
-TXT_UNDERL_ON  = ESC + b'\x2d\x01'  # Underline font 1-dot ON
-TXT_UNDERL2_ON = ESC + b'\x2d\x02'  # Underline font 2-dot ON
-TXT_BOLD_OFF   = ESC + b'\x45\x00'  # Bold font OFF
-TXT_BOLD_ON    = ESC + b'\x45\x01'  # Bold font ON
-TXT_ALIGN_LT   = ESC + b'\x61\x00'  # Left justification
-TXT_ALIGN_CT   = ESC + b'\x61\x01'  # Centering
-TXT_ALIGN_RT   = ESC + b'\x61\x02'  # Right justification
-TXT_INVERT_ON  = GS  + b'\x42\x01'  # Inverse Printing ON
-TXT_INVERT_OFF = GS  + b'\x42\x00'  # Inverse Printing OFF
+        8: 0x07
+    },
+    'width': {                                  # Custom text width
+        1: 0x00,
+        2: 0x10,
+        3: 0x20,
+        4: 0x30,
+        5: 0x40,
+        6: 0x50,
+        7: 0x60,
+        8: 0x70
+    }
+}

 # Fonts
 SET_FONT = lambda n: ESC + b'\x4d' + n
 TXT_FONT_A     = SET_FONT(b'\x00')  # Font type A
 TXT_FONT_B     = SET_FONT(b'\x01')  # Font type B

-# Text colors
-TXT_COLOR_BLACK = ESC + b'\x72\x00'  # Default Color
-TXT_COLOR_RED = ESC + b'\x72\x01'    # Alternative Color (Usually Red)
-
 # Spacing
 LINESPACING_RESET = ESC + b'2'
 LINESPACING_FUNCS = {
@@ -181,6 +225,24 @@ BARCODE_TYPE_B = {
    'GS1 DATABAR EXPANDED':        _SET_BARCODE_TYPE(78),
 }

+BARCODE_FORMATS = {
+    'UPC-A':                       ([(11, 12)], "^[0-9]{11,12}$"),
+    'UPC-E':                       ([(7, 8), (11, 12)], "^([0-9]{7,8}|[0-9]{11,12})$"),
+    'EAN13':                       ([(12, 13)], "^[0-9]{12,13}$"),
+    'EAN8':                        ([(7, 8)], "^[0-9]{7,8}$"),
+    'CODE39':                      ([(1, 255)], "^([0-9A-Z \$\%\+\-\.\/]+|\*[0-9A-Z \$\%\+\-\.\/]+\*)$"),
+    'ITF':                         ([(2, 255)], "^([0-9]{2})+$"),
+    'NW7':                         ([(1, 255)], "^[A-Da-d][0-9\$\+\-\.\/\:]+[A-Da-d]$"),
+    'CODABAR':                     ([(1, 255)], "^[A-Da-d][0-9\$\+\-\.\/\:]+[A-Da-d]$"),  # Same as NW7
+    'CODE93':                      ([(1, 255)], "^[\\x00-\\x7F]+$"),
+    'CODE128':                     ([(2, 255)], "^\{[A-C][\\x00-\\x7F]+$"),
+    'GS1-128':                     ([(2, 255)], "^\{[A-C][\\x00-\\x7F]+$"), # same as CODE128
+    'GS1 DATABAR OMNIDIRECTIONAL': ([(13,13)], "^[0-9]{13}$"),
+    'GS1 DATABAR TRUNCATED':       ([(13,13)], "^[0-9]{13}$"), # same as GS1 omnidirectional
+    'GS1 DATABAR LIMITED':         ([(13,13)], "^[01][0-9]{12}$"),
+    'GS1 DATABAR EXPANDED':        ([(2,255)], "^\([0-9][A-Za-z0-9 \!\"\%\&\'\(\)\*\+\,\-\.\/\:\;\<\=\>\?\_\{]+$"),
+}
+
 BARCODE_TYPES = {
    'A': BARCODE_TYPE_A,
    'B': BARCODE_TYPE_B,
@@ -206,13 +268,11 @@ S_RASTER_2W = _PRINT_RASTER_IMG(b'\x01')  # Set raster image double width
 S_RASTER_2H = _PRINT_RASTER_IMG(b'\x02')  # Set raster image double height
 S_RASTER_Q  = _PRINT_RASTER_IMG(b'\x03')  # Set raster image quadruple

-# Printing Density
-PD_N50 = GS + b'\x7c\x00'  # Printing Density -50%
-PD_N37 = GS + b'\x7c\x01'  # Printing Density -37.5%
-PD_N25 = GS + b'\x7c\x02'  # Printing Density -25%
-PD_N12 = GS + b'\x7c\x03'  # Printing Density -12.5%
-PD_0   = GS + b'\x7c\x04'  # Printing Density  0%
-PD_P50 = GS + b'\x7c\x08'  # Printing Density +50%
-PD_P37 = GS + b'\x7c\x07'  # Printing Density +37.5%
-PD_P25 = GS + b'\x7c\x06'  # Printing Density +25%
-PD_P12 = GS + b'\x7c\x05'  # Printing Density +12.5%
+# Status Command
+RT_STATUS = DLE + EOT
+RT_STATUS_ONLINE = RT_STATUS +  b'\x01'
+RT_STATUS_PAPER = RT_STATUS +  b'\x04'
+RT_MASK_ONLINE = 8
+RT_MASK_PAPER = 18
+RT_MASK_LOWPAPER = 30
+RT_MASK_NOPAPER = 114
--- a/src/escpos/escpos.py
+++ b/src/escpos/escpos.py
@@ -18,22 +18,32 @@ from __future__ import unicode_literals
 import qrcode
 import textwrap
 import six
+import time
+from re import match as re_match
+
+import barcode
+from barcode.writer import ImageWriter
+
+import os

 from .constants import ESC, GS, NUL, QR_ECLEVEL_L, QR_ECLEVEL_M, QR_ECLEVEL_H, QR_ECLEVEL_Q
 from .constants import QR_MODEL_1, QR_MODEL_2, QR_MICRO, BARCODE_TYPES, BARCODE_HEIGHT, BARCODE_WIDTH
-from .constants import TXT_ALIGN_CT, TXT_ALIGN_LT, TXT_ALIGN_RT, BARCODE_FONT_A, BARCODE_FONT_B
+from .constants import BARCODE_FONT_A, BARCODE_FONT_B, BARCODE_FORMATS
 from .constants import BARCODE_TXT_OFF, BARCODE_TXT_BTH, BARCODE_TXT_ABV, BARCODE_TXT_BLW
-from .constants import TXT_HEIGHT, TXT_WIDTH, TXT_SIZE, TXT_NORMAL, TXT_SMOOTH_OFF, TXT_SMOOTH_ON
-from .constants import TXT_FLIP_OFF, TXT_FLIP_ON, TXT_2WIDTH, TXT_2HEIGHT, TXT_4SQUARE
-from .constants import TXT_UNDERL_OFF, TXT_UNDERL_ON, TXT_BOLD_OFF, TXT_BOLD_ON, SET_FONT, TXT_UNDERL2_ON
-from .constants import TXT_INVERT_OFF, TXT_INVERT_ON, LINESPACING_FUNCS, LINESPACING_RESET
-from .constants import PD_0, PD_N12, PD_N25, PD_N37, PD_N50, PD_P50, PD_P37, PD_P25, PD_P12
+from .constants import TXT_SIZE, TXT_NORMAL
+from .constants import SET_FONT
+from .constants import LINESPACING_FUNCS, LINESPACING_RESET
+from .constants import LINE_DISPLAY_OPEN, LINE_DISPLAY_CLEAR, LINE_DISPLAY_CLOSE
 from .constants import CD_KICK_DEC_SEQUENCE, CD_KICK_5, CD_KICK_2, PAPER_FULL_CUT, PAPER_PART_CUT
 from .constants import HW_RESET, HW_SELECT, HW_INIT
-from .constants import CTL_VT, CTL_HT, CTL_CR, CTL_FF, CTL_LF, CTL_SET_HT, PANEL_BUTTON_OFF, PANEL_BUTTON_ON
+from .constants import CTL_VT, CTL_CR, CTL_FF, CTL_LF, CTL_SET_HT, PANEL_BUTTON_OFF, PANEL_BUTTON_ON
+from .constants import TXT_STYLE
+from .constants import RT_STATUS_ONLINE, RT_MASK_ONLINE
+from .constants import RT_STATUS_PAPER, RT_MASK_PAPER, RT_MASK_LOWPAPER, RT_MASK_NOPAPER

 from .exceptions import BarcodeTypeError, BarcodeSizeError, TabPosError
 from .exceptions import CashDrawerError, SetVariableError, BarcodeCodeError
+from .exceptions import ImageWidthError

 from .magicencode import MagicEncode

@@ -73,8 +83,14 @@ class Escpos(object):
        """
        pass

+    def _read(self):
+        """ Returns a NotImplementedError if the instance of the class doesn't override this method.
+        :raises NotImplementedError
+        """
+        raise NotImplementedError()
+
    def image(self, img_source, high_density_vertical=True, high_density_horizontal=True, impl="bitImageRaster",
-              fragment_height=960):
+              fragment_height=960, center=False):
        """ Print an image

        You can select whether the printer should print in high density or not. The default value is high density.
@@ -95,10 +111,26 @@ class Escpos(object):
        :param high_density_horizontal: print in high density in horizontal direction *default:* True
        :param impl: choose image printing mode between `bitImageRaster`, `graphics` or `bitImageColumn`
        :param fragment_height: Images larger than this will be split into multiple fragments *default:* 960
+        :param center: Center image horizontally *default:* False

        """
        im = EscposImage(img_source)

+        try:
+            max_width = int(self.profile.profile_data['media']['width']['pixels'])
+
+            if im.width > max_width:
+                raise ImageWidthError('{} > {}'.format(im.width, max_width))
+
+            if center:
+                im.center(max_width)
+        except KeyError:
+            # If the printer's pixel width is not known, print anyways...
+            pass
+        except ValueError:
+            # If the max_width cannot be converted to an int, print anyways...
+            pass
+
        if im.height > fragment_height:
            fragments = im.split(fragment_height)
            for fragment in fragments:
@@ -149,7 +181,8 @@ class Escpos(object):
        header = self._int_low_high(len(data) + 2, 2)
        self._raw(GS + b'(L' + header + m + fn + data)

-    def qr(self, content, ec=QR_ECLEVEL_L, size=3, model=QR_MODEL_2, native=False):
+    def qr(self, content, ec=QR_ECLEVEL_L, size=3, model=QR_MODEL_2,
+           native=False, center=False, impl="bitImageRaster"):
        """ Print QR Code for the provided string

        :param content: The content of the code. Numeric data will be more efficiently compacted.
@@ -161,6 +194,7 @@ class Escpos(object):
            by all printers).
        :param native: True to render the code on the printer, False to render the code as an image and send it to the
            printer (Default)
+        :param center: Centers the code *default:* False
        """
        # Basic validation
        if ec not in [QR_ECLEVEL_L, QR_ECLEVEL_M, QR_ECLEVEL_H, QR_ECLEVEL_Q]:
@@ -187,9 +221,17 @@ class Escpos(object):
            qr_code.make(fit=True)
            qr_img = qr_code.make_image()
            im = qr_img._img.convert("RGB")
+
            # Convert the RGB image in printable image
-            self.image(im)
+            self.text('\n')
+            self.image(im, center=center, impl=impl)
+            self.text('\n')
+            self.text('\n')
            return
+
+        if center:
+            raise NotImplementedError("Centering not implemented for native QR rendering")
+
        # Native 2D code printing
        cn = b'1'  # Code type for QR code
        # Select model: 1, 2 or micro.
@@ -224,9 +266,9 @@ class Escpos(object):
        """
        max_input = (256 << (out_bytes * 8) - 1)
        if not 1 <= out_bytes <= 4:
-            raise ValueError("Can only output 1-4 byes")
+            raise ValueError("Can only output 1-4 bytes")
        if not 0 <= inp_number <= max_input:
-            raise ValueError("Number too large. Can only output up to {0} in {1} byes".format(max_input, out_bytes))
+            raise ValueError("Number too large. Can only output up to {0} in {1} bytes".format(max_input, out_bytes))
        outp = b''
        for _ in range(0, out_bytes):
            outp += six.int2byte(inp_number % 256)
@@ -248,17 +290,42 @@ class Escpos(object):
        else:
            self.magic.force_encoding(code)

+    @staticmethod
+    def check_barcode(bc, code):
+        """
+        This method checks if the barcode is in the proper format.
+        The validation concerns the barcode length and the set of characters, but won't compute/validate any checksum.
+        The full set of requirement for each barcode type is available in the ESC/POS documentation.
+
+        As an example, using EAN13, the barcode `12345678901` will be correct, because it can be rendered by the
+        printer. But it does not suit the EAN13 standard, because the checksum digit is missing. Adding a wrong
+        checksum in the end will also be considered correct, but adding a letter won't (EAN13 is numeric only).
+
+        .. todo:: Add a method to compute the checksum for the different standards
+
+        .. todo:: For fixed-length standards with mandatory checksum (EAN, UPC),
+            compute and add the checksum automatically if missing.
+
+        :param bc: barcode format, see :py:func`~escpos.Escpos.barcode`
+        :param code: alphanumeric data to be printed as bar code, see :py:func`~escpos.Escpos.barcode`
+        :return: bool
+        """
+        if bc not in BARCODE_FORMATS:
+            return False
+
+        bounds, regex = BARCODE_FORMATS[bc]
+        return any(bound[0] <= len(code) <= bound[1] for bound in bounds) and re_match(regex, code)
+
    def barcode(self, code, bc, height=64, width=3, pos="BELOW", font="A",
-                align_ct=True, function_type=None):
+                align_ct=True, function_type=None, check=True):
        """ Print Barcode

        This method allows to print barcodes. The rendering of the barcode is done by the printer and therefore has to
-        be supported by the unit. Currently you have to check manually whether your barcode text is correct. Uncorrect
-        barcodes may lead to unexpected printer behaviour. There are two forms of the barcode function. Type A is
-        default but has fewer barcodes, while type B has some more to choose from.
-
-        .. todo:: Add a method to check barcode codes. Alternatively or as an addition write explanations about each
-                  barcode-type. Research whether the check digits can be computed autmatically.
+        be supported by the unit. By default, this method will check whether your barcode text is correct, that is
+        the characters and lengths are supported by ESCPOS. Call the method with `check=False` to disable the check, but
+        note that uncorrect barcodes may lead to unexpected printer behaviour.
+        There are two forms of the barcode function. Type A is default but has fewer barcodes,
+        while type B has some more to choose from.

        Use the parameters `height` and `width` for adjusting of the barcode size. Please take notice that the barcode
        will not be printed if it is outside of the printable area. (Which should be impossible with this method, so
@@ -326,6 +393,10 @@ class Escpos(object):
            function based on the current profile.
            *default*: A

+        :param check: If this parameter is True, the barcode format will be checked to ensure it meets the bc
+            requirements as defigned in the esc/pos documentation. See py:func:`~escpos.Escpos.check_barcode`
+            for more information. *default*: True.
+
        :raises: :py:exc:`~escpos.exceptions.BarcodeSizeError`,
                 :py:exc:`~escpos.exceptions.BarcodeTypeError`,
                 :py:exc:`~escpos.exceptions.BarcodeCodeError`
@@ -348,15 +419,22 @@ class Escpos(object):
        bc_types = BARCODE_TYPES[function_type.upper()]
        if bc.upper() not in bc_types.keys():
            raise BarcodeTypeError((
-                "Barcode type '{bc}' not valid for barcode function type "
+                "Barcode '{bc}' not valid for barcode function type "
                "{function_type}").format(
                    bc=bc,
                    function_type=function_type,
                ))

+        if check and not self.check_barcode(bc, code):
+            raise BarcodeCodeError((
+                "Barcode '{code}' not in a valid format for type '{bc}'").format(
+                code=code,
+                bc=bc,
+            ))
+
        # Align Bar Code()
        if align_ct:
-            self._raw(TXT_ALIGN_CT)
+            self._raw(TXT_STYLE['align']['center'])
        # Height
        if 1 <= height <= 255:
            self._raw(BARCODE_HEIGHT + six.int2byte(height))
@@ -396,6 +474,32 @@ class Escpos(object):
        if function_type.upper() == "A":
            self._raw(NUL)

+    def soft_barcode(self, barcode_type, data, impl='bitImageColumn',
+                     module_height=5, module_width=0.2, text_distance=1):
+
+        image_writer = ImageWriter()
+
+        # Check if barcode type exists
+        if barcode_type not in barcode.PROVIDED_BARCODES:
+            raise BarcodeTypeError(
+                'Barcode type {} not supported by software barcode renderer'
+                .format(barcode_type))
+
+        # Render the barcode to a fake file
+        barcode_class = barcode.get_barcode_class(barcode_type)
+        my_code = barcode_class(data, writer=image_writer)
+
+        with open(os.devnull, "wb") as nullfile:
+            my_code.write(nullfile, {
+                'module_height': module_height,
+                'module_width': module_width,
+                'text_distance': text_distance
+            })
+
+        # Retrieve the Pillow image and print it
+        image = my_code.writer._image
+        self.image(image, impl=impl)
+
    def text(self, txt):
        """ Print alpha-numeric text

@@ -408,132 +512,113 @@ class Escpos(object):
        txt = six.text_type(txt)
        self.magic.write(txt)

+    def textln(self, txt=''):
+        """Print alpha-numeric text with a newline
+
+        The text has to be encoded in the currently selected codepage.
+        The input text has to be encoded in unicode.
+
+        :param txt: text to be printed with a newline
+        :raises: :py:exc:`~escpos.exceptions.TextError`
+        """
+        self.text('{}\n'.format(txt))
+
+    def ln(self, count=1):
+        """Print a newline or more
+
+        :param count: number of newlines to print
+        :raises: :py:exc:`ValueError` if count < 0
+        """
+        if count < 0:
+            raise ValueError('Count cannot be lesser than 0')
+        if count > 0:
+            self.text('\n' * count)
+
    def block_text(self, txt, font=None, columns=None):
        """ Text is printed wrapped to specified columns

        Text has to be encoded in unicode.

        :param txt: text to be printed
-        :param font: font to be used, can be :code:`a` or :code`b`
+        :param font: font to be used, can be :code:`a` or :code:`b`
        :param columns: amount of columns
        :return: None
        """
        col_count = self.profile.get_columns(font) if columns is None else columns
        self.text(textwrap.fill(txt, col_count))

-    def set(self, align='left', font='a', text_type='normal', width=1,
-            height=1, density=9, invert=False, smooth=False, flip=False):
+    def set(self, align='left', font='a', bold=False, underline=0, width=1,
+            height=1, density=9, invert=False, smooth=False, flip=False,
+            double_width=False, double_height=False, custom_size=False):
        """ Set text properties by sending them to the printer

        :param align: horizontal position for text, possible values are:

-            * CENTER
-            * LEFT
-            * RIGHT
+            * 'center'
+            * 'left'
+            * 'right'

-            *default*: LEFT
+            *default*: 'left'

        :param font: font given as an index, a name, or one of the
-            special values 'a' or 'b', refering to fonts 0 and 1.
-        :param text_type: text type, possible values are:
-
-            * B for bold
-            * U for underlined
-            * U2 for underlined, version 2
-            * BU for bold and underlined
-            * BU2 for bold and underlined, version 2
-            * NORMAL for normal text
-
-            *default*: NORMAL
-        :param width: text width multiplier, decimal range 1-8,  *default*: 1
-        :param height: text height multiplier, decimal range 1-8, *default*: 1
+            special values 'a' or 'b', referring to fonts 0 and 1.
+        :param bold: text in bold, *default*: False
+        :param underline: underline mode for text, decimal range 0-2,  *default*: 0
+        :param double_height: doubles the height of the text
+        :param double_width: doubles the width of the text
+        :param custom_size: uses custom size specified by width and height
+            parameters. Cannot be used with double_width or double_height.
+        :param width: text width multiplier when custom_size is used, decimal range 1-8,  *default*: 1
+        :param height: text height multiplier when custom_size is used, decimal range 1-8, *default*: 1
        :param density: print density, value from 0-8, if something else is supplied the density remains unchanged
        :param invert: True enables white on black printing, *default*: False
        :param smooth: True enables text smoothing. Effective on 4x4 size text and larger, *default*: False
        :param flip: True enables upside-down printing, *default*: False
+
+        :type font: str
        :type invert: bool
+        :type bold: bool
+        :type underline: bool
+        :type smooth: bool
+        :type flip: bool
+        :type custom_size: bool
+        :type double_width: bool
+        :type double_height: bool
+        :type align: str
+        :type width: int
+        :type height: int
+        :type density: int
        """
-        # Width
-        if height == 2 and width == 2:
-            self._raw(TXT_NORMAL)
-            self._raw(TXT_4SQUARE)
-        elif height == 2 and width == 1:
-            self._raw(TXT_NORMAL)
-            self._raw(TXT_2HEIGHT)
-        elif width == 2 and height == 1:
-            self._raw(TXT_NORMAL)
-            self._raw(TXT_2WIDTH)
-        elif width == 1 and height == 1:
-            self._raw(TXT_NORMAL)
-        elif 1 <= width <= 8 and 1 <= height <= 8 and isinstance(width, int) and isinstance(height, int):
-            self._raw(TXT_SIZE + six.int2byte(TXT_WIDTH[width] + TXT_HEIGHT[height]))
+
+        if custom_size:
+            if 1 <= width <= 8 and 1 <= height <= 8 and isinstance(width, int) and\
+              isinstance(height, int):
+                size_byte = TXT_STYLE['width'][width] + TXT_STYLE['height'][height]
+                self._raw(TXT_SIZE + six.int2byte(size_byte))
            else:
                raise SetVariableError()
-        # Upside down
-        if flip:
-            self._raw(TXT_FLIP_ON)
        else:
-            self._raw(TXT_FLIP_OFF)
-        # Smoothing
-        if smooth:
-            self._raw(TXT_SMOOTH_ON)
+            self._raw(TXT_NORMAL)
+            if double_width and double_height:
+                self._raw(TXT_STYLE['size']['2x'])
+            elif double_width:
+                self._raw(TXT_STYLE['size']['2w'])
+            elif double_height:
+                self._raw(TXT_STYLE['size']['2h'])
            else:
-            self._raw(TXT_SMOOTH_OFF)
-        # Type
-        if text_type.upper() == "B":
-            self._raw(TXT_BOLD_ON)
-            self._raw(TXT_UNDERL_OFF)
-        elif text_type.upper() == "U":
-            self._raw(TXT_BOLD_OFF)
-            self._raw(TXT_UNDERL_ON)
-        elif text_type.upper() == "U2":
-            self._raw(TXT_BOLD_OFF)
-            self._raw(TXT_UNDERL2_ON)
-        elif text_type.upper() == "BU":
-            self._raw(TXT_BOLD_ON)
-            self._raw(TXT_UNDERL_ON)
-        elif text_type.upper() == "BU2":
-            self._raw(TXT_BOLD_ON)
-            self._raw(TXT_UNDERL2_ON)
-        elif text_type.upper() == "NORMAL":
-            self._raw(TXT_BOLD_OFF)
-            self._raw(TXT_UNDERL_OFF)
-        # Font
-        self._raw(SET_FONT(six.int2byte(self.profile.get_font(font))))
+                self._raw(TXT_STYLE['size']['normal'])

-        # Align
-        if align.upper() == "CENTER":
-            self._raw(TXT_ALIGN_CT)
-        elif align.upper() == "RIGHT":
-            self._raw(TXT_ALIGN_RT)
-        elif align.upper() == "LEFT":
-            self._raw(TXT_ALIGN_LT)
-        # Density
-        if density == 0:
-            self._raw(PD_N50)
-        elif density == 1:
-            self._raw(PD_N37)
-        elif density == 2:
-            self._raw(PD_N25)
-        elif density == 3:
-            self._raw(PD_N12)
-        elif density == 4:
-            self._raw(PD_0)
-        elif density == 5:
-            self._raw(PD_P12)
-        elif density == 6:
-            self._raw(PD_P25)
-        elif density == 7:
-            self._raw(PD_P37)
-        elif density == 8:
-            self._raw(PD_P50)
-        else:  # DEFAULT: DOES NOTHING
-            pass
-        # Invert Printing
-        if invert:
-            self._raw(TXT_INVERT_ON)
-        else:
-            self._raw(TXT_INVERT_OFF)
+        self._raw(TXT_STYLE['flip'][flip])
+        self._raw(TXT_STYLE['smooth'][smooth])
+        self._raw(TXT_STYLE['bold'][bold])
+        self._raw(TXT_STYLE['underline'][underline])
+        self._raw(SET_FONT(six.int2byte(self.profile.get_font(font))))
+        self._raw(TXT_STYLE['align'][align])
+
+        if density != 9:
+            self._raw(TXT_STYLE['density'][density])
+
+        self._raw(TXT_STYLE['invert'][invert])

    def line_spacing(self, spacing=None, divisor=180):
        """ Set line character spacing.
@@ -564,7 +649,7 @@ class Escpos(object):

        self._raw(LINESPACING_FUNCS[divisor] + six.int2byte(spacing))

-    def cut(self, mode=''):
+    def cut(self, mode='FULL', feed=True):
        """ Cut paper.

        Without any arguments the paper will be cut completely. With 'mode=PART' a partial cut will
@@ -573,15 +658,31 @@ class Escpos(object):

        .. todo:: Check this function on TM-T88II.

-        :param mode: set to 'PART' for a partial cut
+        :param mode: set to 'PART' for a partial cut. default: 'FULL'
+        :param feed: print and feed before cutting. default: true
+        :raises ValueError: if mode not in ('FULL', 'PART')
        """
-        # Fix the size between last line and cut
-        # TODO: handle this with a line feed
-        self._raw(b"\n\n\n\n\n\n")
-        if mode.upper() == "PART":
+
+        if not feed:
+            self._raw(GS + b'V' + six.int2byte(66) + b'\x00')
+            return
+
+        self.print_and_feed(6)
+
+        mode = mode.upper()
+        if mode not in ('FULL', 'PART'):
+            raise ValueError("Mode must be one of ('FULL', 'PART')")
+
+        if mode == "PART":
+            if self.profile.supports('paperPartCut'):
                self._raw(PAPER_PART_CUT)
-        else:  # DEFAULT MODE: FULL CUT
+            elif self.profile.supports('paperFullCut'):
                self._raw(PAPER_FULL_CUT)
+        elif mode == "FULL":
+            if self.profile.supports('paperFullCut'):
+                self._raw(PAPER_FULL_CUT)
+            elif self.profile.supports('paperPartCut'):
+                self._raw(PAPER_PART_CUT)

    def cashdraw(self, pin):
        """ Send pulse to kick the cash drawer
@@ -599,8 +700,44 @@ class Escpos(object):
        else:
            try:
                self._raw(CD_KICK_DEC_SEQUENCE(*pin))
-            except:
-                raise CashDrawerError()
+            except TypeError as err:
+                raise CashDrawerError(err)
+
+    def linedisplay_select(self, select_display=False):
+        """ Selects the line display or the printer
+
+        This method is used for line displays that are daisy-chained between your computer and printer.
+        If you set `select_display` to true, only the display is selected and if you set it to false,
+        only the printer is selected.
+
+        :param select_display: whether the display should be selected or the printer
+        :type select_display: bool
+        """
+        if select_display:
+            self._raw(LINE_DISPLAY_OPEN)
+        else:
+            self._raw(LINE_DISPLAY_CLOSE)
+
+    def linedisplay_clear(self):
+        """ Clears the line display and resets the cursor
+
+        This method is used for line displays that are daisy-chained between your computer and printer.
+        """
+        self._raw(LINE_DISPLAY_CLEAR)
+
+    def linedisplay(self, text):
+        """
+        Display text on a line display connected to your printer
+
+        You should connect a line display to your printer. You can do this by daisy-chaining
+        the display between your computer and printer.
+
+        :param text: Text to display
+        """
+        self.linedisplay_select(select_display=True)
+        self.linedisplay_clear()
+        self.text(text)
+        self.linedisplay_select(select_display=False)

    def hw(self, hw):
        """ Hardware operations
@@ -620,7 +757,21 @@ class Escpos(object):
        else:  # DEFAULT: DOES NOTHING
            pass

-    def control(self, ctl, pos=4):
+    def print_and_feed(self, n=1):
+        """ Print data in print buffer and feed *n* lines
+
+            if n not in range (0, 255) then ValueError will be raised
+
+            :param n: number of n to feed. 0 <= n <= 255. default: 1
+            :raises ValueError: if not 0 <= n <= 255
+        """
+        if 0 <= n <= 255:
+            # ESC d n
+            self._raw(ESC + b"d" + six.int2byte(n))
+        else:
+            raise ValueError("n must be betwen 0 and 255")
+
+    def control(self, ctl, count=5, tab_size=8):
        """ Feed control sequences

        :param ctl: string for the following control sequences:
@@ -631,14 +782,10 @@ class Escpos(object):
            * HT *for Horizontal Tab*
            * VT *for Vertical Tab*

-        :param pos: integer between 1 and 16, controls the horizontal tab position
+        :param count: integer between 1 and 32, controls the horizontal tab count. Defaults to 5.
+        :param tab_size: integer between 1 and 255, controls the horizontal tab size in characters. Defaults to 8
        :raises: :py:exc:`~escpos.exceptions.TabPosError`
        """
-        # Set tab positions
-        if not (1 <= pos <= 16):
-            raise TabPosError()
-        else:
-            self._raw(CTL_SET_HT + six.int2byte(pos))
        # Set position
        if ctl.upper() == "LF":
            self._raw(CTL_LF)
@@ -647,7 +794,16 @@ class Escpos(object):
        elif ctl.upper() == "CR":
            self._raw(CTL_CR)
        elif ctl.upper() == "HT":
-            self._raw(CTL_HT)
+            if not (0 <= count <= 32 and
+                    1 <= tab_size <= 255 and
+                    count * tab_size < 256):
+                raise TabPosError()
+            else:
+                # Set tab positions
+                self._raw(CTL_SET_HT)
+                for iterator in range(1, count):
+                    self._raw(six.int2byte(iterator * tab_size))
+                self._raw(NUL)
        elif ctl.upper() == "VT":
            self._raw(CTL_VT)

@@ -674,12 +830,58 @@ class Escpos(object):
        else:
            self._raw(PANEL_BUTTON_OFF)

+    def query_status(self, mode):
+        """
+        Queries the printer for its status, and returns an array of integers containing it.
+
+        :param mode: Integer that sets the status mode queried to the printer.
+            - RT_STATUS_ONLINE: Printer status.
+            - RT_STATUS_PAPER: Paper sensor.
+        :rtype: array(integer)
+        """
+        self._raw(mode)
+        time.sleep(1)
+        status = self._read()
+        return status
+
+    def is_online(self):
+        """
+        Queries the online status of the printer.
+
+        :returns: When online, returns ``True``; ``False`` otherwise.
+        :rtype: bool
+        """
+        status = self.query_status(RT_STATUS_ONLINE)
+        if len(status) == 0:
+            return False
+        return not (status[0] & RT_MASK_ONLINE)
+
+    def paper_status(self):
+        """
+        Queries the paper status of the printer.
+
+        Returns 2 if there is plenty of paper, 1 if the paper has arrived to
+        the near-end sensor and 0 if there is no paper.
+
+        :returns: 2: Paper is adequate. 1: Paper ending. 0: No paper.
+        :rtype: int
+        """
+        status = self.query_status(RT_STATUS_PAPER)
+        if len(status) == 0:
+            return 2
+        if (status[0] & RT_MASK_NOPAPER == RT_MASK_NOPAPER):
+            return 0
+        if (status[0] & RT_MASK_LOWPAPER == RT_MASK_LOWPAPER):
+            return 1
+        if (status[0] & RT_MASK_PAPER == RT_MASK_PAPER):
+            return 2
+

 class EscposIO(object):
    """ESC/POS Printer IO object

    Allows the class to be used together with the `with`-statement. You have to define a printer instance
-    and assign it to the EsposIO-class.
+    and assign it to the EscposIO class.
    This example explains the usage:

    .. code-block:: Python
--- a/src/escpos/exceptions.py
+++ b/src/escpos/exceptions.py
@@ -8,6 +8,7 @@ Result/Exit codes:
    - `20` = Barcode size values are out of range :py:exc:`~escpos.exceptions.BarcodeSizeError`
    - `30` = Barcode text not supplied :py:exc:`~escpos.exceptions.BarcodeCodeError`
    - `40` = Image height is too large :py:exc:`~escpos.exceptions.ImageSizeError`
+    - `41` = Image width is too large :py:exc:`~escpos.exceptions.ImageWidthError`
    - `50` = No string supplied to be printed :py:exc:`~escpos.exceptions.TextError`
    - `60` = Invalid pin to send Cash Drawer pulse :py:exc:`~escpos.exceptions.CashDrawerError`
    - `70` = Invalid number of tab positions :py:exc:`~escpos.exceptions.TabPosError`
@@ -76,9 +77,10 @@ class BarcodeSizeError(Error):


 class BarcodeCodeError(Error):
-    """ No Barcode code was supplied.
+    """ No Barcode code was supplied, or it is incorrect.

-    No data for the barcode has been supplied in :py:meth:`escpos.escpos.Escpos.barcode`.
+    No data for the barcode has been supplied in :py:meth:`escpos.escpos.Escpos.barcode` or the the `check` parameter
+    was True and the check failed.
    The returncode for this exception is `30`.
    """
    def __init__(self, msg=""):
@@ -104,6 +106,20 @@ class ImageSizeError(Error):
        return "Image height is longer than 255px and can't be printed ({msg})".format(msg=self.msg)


+class ImageWidthError(Error):
+    """ Image width is too large.
+
+    The return code for this exception is `41`.
+    """
+    def __init__(self, msg=""):
+        Error.__init__(self, msg)
+        self.msg = msg
+        self.resultcode = 41
+
+    def __str__(self):
+        return "Image width is too large ({msg})".format(msg=self.msg)
+
+
 class TextError(Error):
    """ Text string must be supplied to the `text()` method.

@@ -135,7 +151,8 @@ class CashDrawerError(Error):


 class TabPosError(Error):
-    """ Valid tab positions must be in the range 0 to 16.
+    """ Valid tab positions must be set by using from 1 to 32 tabs, and between 1 and 255 tab size values.
+    Both values multiplied must not exceed 255, since it is the maximum tab value.

    This exception is raised by :py:meth:`escpos.escpos.Escpos.control`.
    The returncode for this exception is `70`.
--- a/src/escpos/image.py
+++ b/src/escpos/image.py
@@ -115,3 +115,19 @@ class EscposImage(object):
            box = (left, upper, right, lower)
            fragments.append(self.img_original.crop(box))
        return fragments
+
+    def center(self, max_width):
+        """In-place image centering
+
+        :param: Maximum width in order to deduce x offset for centering
+        :return: None
+        """
+        old_width, height = self._im.size
+        new_size = (max_width, height)
+
+        new_im = Image.new("1", new_size)
+        paste_x = int((max_width - old_width) / 2)
+
+        new_im.paste(self._im, (paste_x, 0))
+
+        self._im = new_im
--- a/src/escpos/printer.py
+++ b/src/escpos/printer.py
@@ -84,6 +84,10 @@ class Usb(Escpos):
        """
        self.device.write(self.out_ep, msg, self.timeout)

+    def _read(self):
+        """ Reads a data buffer and returns it to the caller. """
+        return self.device.read(self.in_ep, 16)
+
    def close(self):
        """ Release USB interface """
        if self.device:
@@ -131,6 +135,8 @@ class Serial(Escpos):

    def open(self):
        """ Setup serial port and set is as escpos device """
+        if self.device is not None and self.device.is_open:
+            self.close()
        self.device = serial.Serial(port=self.devfile, baudrate=self.baudrate,
                                    bytesize=self.bytesize, parity=self.parity,
                                    stopbits=self.stopbits, timeout=self.timeout,
@@ -149,9 +155,13 @@ class Serial(Escpos):
        """
        self.device.write(msg)

+    def _read(self):
+        """ Reads a data buffer and returns it to the caller. """
+        return self.device.read(16)
+
    def close(self):
        """ Close Serial interface """
-        if self.device is not None:
+        if self.device is not None and self.device.is_open:
            self.device.flush()
            self.device.close()

@@ -302,5 +312,13 @@ class Dummy(Escpos):
        """ Get the data that was sent to this printer """
        return b''.join(self._output_list)

+    def clear(self):
+        """ Clear the buffer of the printer
+
+        This method can be called if you send the contents to a physical printer
+        and want to use the Dummy printer for new output.
+        """
+        del self._output_list[:]
+
    def close(self):
        pass
--- a/test/test_function_barcode.py
+++ b/test/test_function_barcode.py
@@ -7,7 +7,7 @@ from __future__ import unicode_literals
 import escpos.printer as printer
 from escpos.constants import BARCODE_TYPE_A, BARCODE_TYPE_B
 from escpos.capabilities import Profile, BARCODE_B
-from escpos.exceptions import BarcodeTypeError
+from escpos.exceptions import BarcodeTypeError, BarcodeCodeError
 import pytest


@@ -36,3 +36,17 @@ def test_lacks_support(bctype, supports_b):
        instance.barcode('test', bctype)

    assert instance.output == b''
+
+
+@pytest.mark.parametrize("bctype,data", [
+    ('EAN13', 'AA'),
+    ('CODE128', '{D2354AA'),
+])
+def test_code_check(bctype, data):
+    """should raise an error if the barcode code is invalid.
+    """
+    instance = printer.Dummy()
+    with pytest.raises(BarcodeCodeError):
+        instance.barcode(data, bctype)
+
+    assert instance.output == b''
--- a/test/test_function_cashdraw.py
+++ b/test/test_function_cashdraw.py
@@ -0,0 +1,19 @@
+#!/usr/bin/python
+from __future__ import absolute_import
+from __future__ import division
+from __future__ import print_function
+from __future__ import unicode_literals
+
+import escpos.printer as printer
+from escpos.exceptions import CashDrawerError
+import pytest
+
+
+def test_raise_CashDrawerError():
+    """should raise an error if the sequence is invalid.
+    """
+    instance = printer.Dummy()
+    with pytest.raises(CashDrawerError):
+        # call with sequence that is too long
+        instance.cashdraw([1,1,1,1,1,1])
+
--- a/test/test_function_check_barcode.py
+++ b/test/test_function_check_barcode.py
@@ -0,0 +1,104 @@
+#!/usr/bin/python
+# -*- coding: utf-8 -*-
+
+from __future__ import absolute_import
+from __future__ import division
+from __future__ import print_function
+from __future__ import unicode_literals
+
+import escpos.printer as printer
+import pytest
+
+
+@pytest.mark.parametrize("bctype,data", [
+    ('UPC-A', '01234567890'),
+    ('UPC-A', '012345678905'),
+    ('UPC-E', '01234567'),
+    ('UPC-E', '0123456'),
+    ('UPC-E', '012345678905'),
+    ('EAN13', '0123456789012'),
+    ('EAN13', '012345678901'),
+    ('EAN8', '01234567'),
+    ('EAN8', '0123456'),
+    ('CODE39', 'ABC-1234'),
+    ('CODE39', 'ABC-1234-$$-+A'),
+    ('CODE39', '*WIKIPEDIA*'),
+    ('ITF', '010203040506070809'),
+    ('ITF', '11221133113344556677889900'),
+    ('CODABAR', 'A2030405060B'),
+    ('CODABAR', 'C11221133113344556677889900D'),
+    ('CODABAR', 'D0D'),
+    ('NW7', 'A2030405060B'),
+    ('NW7', 'C11221133113344556677889900D'),
+    ('NW7', 'D0D'),
+    ('CODE93', 'A2030405060B'),
+    ('CODE93', '+:$&23-7@$'),
+    ('CODE93', 'D0D'),
+    ('CODE128', '{A2030405060B'),
+    ('CODE128', '{C+:$&23-7@$'),
+    ('CODE128', '{B0D'),
+    ('GS1-128', '{A2030405060B'),
+    ('GS1-128', '{C+:$&23-7@$'),
+    ('GS1-128', '{B0D'),
+    ('GS1 DATABAR OMNIDIRECTIONAL', '0123456789123'),
+    ('GS1 DATABAR TRUNCATED', '0123456789123'),
+    ('GS1 DATABAR LIMITED', '0123456789123'),
+    ('GS1 DATABAR EXPANDED', '(9A{A20304+-%&06a0B'),
+    ('GS1 DATABAR EXPANDED', '(1 {C+:&23-7%'),
+    ('GS1 DATABAR EXPANDED', '(00000001234567678'),
+])
+def test_check_valid_barcode(bctype, data):
+    assert (printer.Escpos.check_barcode(bctype, data))
+
+
+@pytest.mark.parametrize("bctype,data", [
+    ('UPC-A', '01234567890123'),  # too long
+    ('UPC-A', '0123456789'),  # too short
+    ('UPC-A', '72527273-711'),  # invalid '-'
+    ('UPC-A', 'A12345678901'),  # invalid 'A'
+    ('UPC-E', '01234567890123'),  # too long
+    ('UPC-E', '012345'),  # too short
+    ('UPC-E', '72527-2'),  # invalid '-'
+    ('UPC-E', 'A123456'),  # invalid 'A'
+    ('EAN13', '0123456789'),  # too short
+    ('EAN13', 'A123456789012'),  # invalid 'A'
+    ('EAN13', '012345678901234'),  # too long
+    ('EAN8', '012345'),  # too short
+    ('EAN8', 'A123456789012'),  # invalid 'A'
+    ('EAN8', '012345678901234'),  # too long
+    ('CODE39', 'ALKJ_34'),  # invalid '_'
+    ('CODE39', 'A' * 256),  # too long
+    ('ITF', '010203040'),  # odd length
+    ('ITF', '0' * 256),  # too long
+    ('ITF', 'AB01'),  # invalid 'A'
+    ('CODABAR', '010203040'),  # no start/stop
+    ('CODABAR', '0' * 256),  # too long
+    ('CODABAR', 'AB-01F'),  # invalid 'B'
+    ('NW7', '010203040'),  # no start/stop
+    ('NW7', '0' * 256),  # too long
+    ('NW7', 'AB-01F'),  # invalid 'B'
+    ('CODE93', 'é010203040'),  # invalid 'é'
+    ('CODE93', '0' * 256),  # too long
+    ('CODE128', '010203040'),  # missing leading {
+    ('CODE128', '{D2354AA'),  # second char not between A-C
+    ('CODE128', '0' * 256),  # too long
+    ('GS1-128', '010203040'),  # missing leading {
+    ('GS1-128', '{D2354AA'),  # second char not between A-C
+    ('GS1-128', '0' * 256),  # too long
+    ('GS1 DATABAR OMNIDIRECTIONAL', '01234567891234'),  # too long
+    ('GS1 DATABAR OMNIDIRECTIONAL', '012345678912'),  # too short
+    ('GS1 DATABAR OMNIDIRECTIONAL', '012345678A1234'),  # invalid 'A'
+    ('GS1 DATABAR TRUNCATED', '01234567891234'),  # too long
+    ('GS1 DATABAR TRUNCATED', '012345678912'),  # too short
+    ('GS1 DATABAR TRUNCATED', '012345678A1234'),  # invalid 'A'
+    ('GS1 DATABAR LIMITED', '01234567891234'),  # too long
+    ('GS1 DATABAR LIMITED', '012345678912'),  # too short
+    ('GS1 DATABAR LIMITED', '012345678A1234'),  # invalid 'A'
+    ('GS1 DATABAR LIMITED', '02345678912341'),  # invalid start (should be 01)
+    ('GS1 DATABAR EXPANDED', '010203040'),  # missing leading (
+    ('GS1-128', '(' + ('0' * 256)),  # too long
+    ('GS1 DATABAR EXPANDED', '(a{D2354AA'),  # second char not between 0-9
+    ('GS1 DATABAR EXPANDED', 'IT will fail'),  # first char not '('
+])
+def test_check_invalid_barcode(bctype, data):
+    assert (not printer.Escpos.check_barcode(bctype, data))
--- a/test/test_function_cut.py
+++ b/test/test_function_cut.py
@@ -0,0 +1,17 @@
+from __future__ import absolute_import
+from __future__ import division
+from __future__ import print_function
+from __future__ import unicode_literals
+
+import six
+
+import escpos.printer as printer
+from escpos.constants import GS
+
+
+def test_cut_without_feed():
+    """Test cut without feeding paper"""
+    instance = printer.Dummy()
+    instance.cut(feed=False)
+    expected = GS + b'V' + six.int2byte(66) + b'\x00'
+    assert(instance.output == expected)
--- a/test/test_function_dummy_clear.py
+++ b/test/test_function_dummy_clear.py
@@ -0,0 +1,8 @@
+from nose.tools import assert_raises
+from escpos.printer import Dummy
+
+def test_printer_dummy_clear():
+    printer = Dummy()
+    printer.text("Hello")
+    printer.clear()
+    assert(printer.output == b'')
--- a/test/test_function_image.py
+++ b/test/test_function_image.py
@@ -12,9 +12,13 @@ from __future__ import division
 from __future__ import print_function
 from __future__ import unicode_literals

-import escpos.printer as printer
+import pytest
+
 from PIL import Image

+import escpos.printer as printer
+from escpos.exceptions import ImageWidthError
+

 # Raster format print
 def test_bit_image_black():
@@ -139,3 +143,37 @@ def test_large_graphics():
    instance = printer.Dummy()
    instance.image('test/resources/black_white.png', impl="bitImageRaster", fragment_height=1)
    assert(instance.output == b'\x1dv0\x00\x01\x00\x01\x00\xc0\x1dv0\x00\x01\x00\x01\x00\x00')
+
+
+@pytest.fixture
+def dummy_with_width():
+    instance = printer.Dummy()
+    instance.profile.profile_data = {
+        'media': {
+            'width': {
+                'pixels': 384
+            }
+        }
+    }
+    return instance
+
+
+def test_width_too_large(dummy_with_width):
+    """
+    Test printing an image that is too large in width.
+    """
+    instance = dummy_with_width
+
+    with pytest.raises(ImageWidthError):
+        instance.image(Image.new("RGB", (385, 200)))
+
+    instance.image(Image.new("RGB", (384, 200)))
+
+
+def test_center_image(dummy_with_width):
+    instance = dummy_with_width
+
+    with pytest.raises(ImageWidthError):
+        instance.image(Image.new("RGB", (385, 200)), center=True)
+
+    instance.image(Image.new("RGB", (384, 200)), center=True)
--- a/test/test_function_linedisplay.py
+++ b/test/test_function_linedisplay.py
@@ -0,0 +1,35 @@
+#!/usr/bin/python
+"""tests for line display
+
+:author: `Patrick Kanzler <patrick.kanzler@fablab.fau.de>`_
+:organization: `python-escpos <https://github.com/python-escpos>`_
+:copyright: Copyright (c) 2017 `python-escpos <https://github.com/python-escpos>`_
+:license: MIT
+"""
+
+from __future__ import absolute_import
+from __future__ import division
+from __future__ import print_function
+from __future__ import unicode_literals
+
+import escpos.printer as printer
+
+
+def test_function_linedisplay_select_on():
+    """test the linedisplay_select function (activate)"""
+    instance = printer.Dummy()
+    instance.linedisplay_select(select_display=True)
+    assert(instance.output == b'\x1B\x3D\x02')
+
+def test_function_linedisplay_select_off():
+    """test the linedisplay_select function (deactivate)"""
+    instance = printer.Dummy()
+    instance.linedisplay_select(select_display=False)
+    assert(instance.output == b'\x1B\x3D\x01')
+
+def test_function_linedisplay_clear():
+    """test the linedisplay_clear function"""
+    instance = printer.Dummy()
+    instance.linedisplay_clear()
+    assert(instance.output == b'\x1B\x40')
+
--- a/test/test_function_panel_button.py
+++ b/test/test_function_panel_button.py
@@ -12,43 +12,18 @@ from __future__ import division
 from __future__ import print_function
 from __future__ import unicode_literals

-from nose.tools import with_setup
-
 import escpos.printer as printer
-import os
-
-devfile = 'testfile'


-def setup_testfile():
-    """create a testfile as devfile"""
-    fhandle = open(devfile, 'a')
-    try:
-        os.utime(devfile, None)
-    finally:
-        fhandle.close()
-
-
-def teardown_testfile():
-    """destroy testfile again"""
-    os.remove(devfile)
-
-
-@with_setup(setup_testfile, teardown_testfile)
 def test_function_panel_button_on():
    """test the panel button function (enabling) by comparing output"""
-    instance = printer.File(devfile=devfile)
+    instance = printer.Dummy()
    instance.panel_buttons()
-    instance.flush()
-    with open(devfile, "rb") as f:
-        assert(f.read() == b'\x1B\x63\x35\x00')
+    assert(instance.output == b'\x1B\x63\x35\x00')


-@with_setup(setup_testfile, teardown_testfile)
 def test_function_panel_button_off():
    """test the panel button function (disabling) by comparing output"""
-    instance = printer.File(devfile=devfile)
+    instance = printer.Dummy()
    instance.panel_buttons(False)
-    instance.flush()
-    with open(devfile, "rb") as f:
-        assert(f.read() == b'\x1B\x63\x35\x01')
+    assert(instance.output == b'\x1B\x63\x35\x01')
--- a/test/test_function_qr_native.py
+++ b/test/test_function_qr_native.py
@@ -13,6 +13,8 @@ from __future__ import print_function
 from __future__ import unicode_literals

 from nose.tools import raises
+import pytest
+
 import escpos.printer as printer
 from escpos.constants import QR_ECLEVEL_H, QR_MODEL_1

@@ -25,7 +27,6 @@ def test_defaults():
        b'(k\x07\x001P01234\x1d(k\x03\x001Q0'
    assert(instance.output == expected)

-
 def test_empty():
    """Test QR printing blank code"""
    instance = printer.Dummy()
@@ -81,14 +82,17 @@ def test_invalid_model():
    instance.qr("1234", native=True, model="Hello")


+@pytest.mark.skip("this test has to be debugged")
 def test_image():
    """Test QR as image"""
    instance = printer.Dummy()
    instance.qr("1", native=False, size=1)
    print(instance.output)
-    expected = b'\x1dv0\x00\x03\x00\x17\x00\x00\x00\x00\x7f]\xfcA\x19\x04]it]et' \
+    expected = b'\x1bt\x00\n' \
+        b'\x1dv0\x00\x03\x00\x17\x00\x00\x00\x00\x7f]\xfcA\x19\x04]it]et' \
        b']ItA=\x04\x7fU\xfc\x00\x0c\x00y~t4\x7f =\xa84j\xd9\xf0\x05\xd4\x90\x00' \
-        b'i(\x7f<\xa8A \xd8]\'\xc4]y\xf8]E\x80Ar\x94\x7fR@\x00\x00\x00'
+        b'i(\x7f<\xa8A \xd8]\'\xc4]y\xf8]E\x80Ar\x94\x7fR@\x00\x00\x00' \
+        b'\n\n'
    assert(instance.output == expected)


@@ -97,3 +101,13 @@ def test_image_invalid_model():
    """Test unsupported QR model as image"""
    instance = printer.Dummy()
    instance.qr("1234", native=False, model=QR_MODEL_1)
+
+
+@pytest.fixture
+def instance():
+    return printer.Dummy()
+
+
+def test_center_not_implementer(instance):
+    with pytest.raises(NotImplementedError):
+        instance.qr("test", center=True, native=True)
--- a/test/test_function_qr_non-native.py
+++ b/test/test_function_qr_non-native.py
@@ -13,6 +13,7 @@ from __future__ import division
 from __future__ import print_function
 from __future__ import unicode_literals

+import pytest
 import mock

 from escpos.printer import Dummy
@@ -30,3 +31,12 @@ def test_type_of_object_passed_to_image_function(img_function):
    d.qr("LoremIpsum")
    args, kwargs = img_function.call_args
    assert isinstance(args[0], Image.Image)
+
+
+@pytest.fixture
+def instance():
+    return Dummy()
+
+
+def test_center(instance):
+    instance.qr("LoremIpsum", center=True)
--- a/test/test_function_set.py
+++ b/test/test_function_set.py
@@ -0,0 +1,280 @@
+from __future__ import absolute_import
+from __future__ import division
+from __future__ import print_function
+from __future__ import unicode_literals
+
+import six
+
+import escpos.printer as printer
+from escpos.constants import TXT_NORMAL, TXT_STYLE, SET_FONT
+from escpos.constants import TXT_SIZE
+
+
+# Default test, please copy and paste this block to test set method calls
+
+def test_default_values():
+    instance = printer.Dummy()
+    instance.set()
+
+    expected_sequence = (
+        TXT_NORMAL, TXT_STYLE['size']['normal'],  # Normal text size
+        TXT_STYLE['flip'][False],  # Flip OFF
+        TXT_STYLE['smooth'][False],  # Smooth OFF
+        TXT_STYLE['bold'][False],  # Bold OFF
+        TXT_STYLE['underline'][0],  # Underline OFF
+        SET_FONT(b'\x00'),  # Default font
+        TXT_STYLE['align']['left'],  # Align left
+        TXT_STYLE['invert'][False]  # Inverted OFF
+    )
+
+    assert(instance.output == b''.join(expected_sequence))
+
+# Size tests
+
+def test_set_size_2h():
+    instance = printer.Dummy()
+    instance.set(double_height=True)
+
+    expected_sequence = (
+        TXT_NORMAL, TXT_STYLE['size']['2h'],  # Double height text size
+        TXT_STYLE['flip'][False],  # Flip OFF
+        TXT_STYLE['smooth'][False],  # Smooth OFF
+        TXT_STYLE['bold'][False],  # Bold OFF
+        TXT_STYLE['underline'][0],  # Underline OFF
+        SET_FONT(b'\x00'),  # Default font
+        TXT_STYLE['align']['left'],  # Align left
+        TXT_STYLE['invert'][False]  # Inverted OFF
+    )
+
+    assert (instance.output == b''.join(expected_sequence))
+
+
+def test_set_size_2w():
+    instance = printer.Dummy()
+    instance.set(double_width=True)
+
+    expected_sequence = (
+        TXT_NORMAL, TXT_STYLE['size']['2w'],  # Double width text size
+        TXT_STYLE['flip'][False],  # Flip OFF
+        TXT_STYLE['smooth'][False],  # Smooth OFF
+        TXT_STYLE['bold'][False],  # Bold OFF
+        TXT_STYLE['underline'][0],  # Underline OFF
+        SET_FONT(b'\x00'),  # Default font
+        TXT_STYLE['align']['left'],  # Align left
+        TXT_STYLE['invert'][False]  # Inverted OFF
+    )
+
+    assert (instance.output == b''.join(expected_sequence))
+
+
+def test_set_size_2x():
+    instance = printer.Dummy()
+    instance.set(double_height=True, double_width=True)
+
+    expected_sequence = (
+        TXT_NORMAL, TXT_STYLE['size']['2x'],  # Double text size
+        TXT_STYLE['flip'][False],  # Flip OFF
+        TXT_STYLE['smooth'][False],  # Smooth OFF
+        TXT_STYLE['bold'][False],  # Bold OFF
+        TXT_STYLE['underline'][0],  # Underline OFF
+        SET_FONT(b'\x00'),  # Default font
+        TXT_STYLE['align']['left'],  # Align left
+        TXT_STYLE['invert'][False]  # Inverted OFF
+    )
+
+    assert (instance.output == b''.join(expected_sequence))
+
+
+def test_set_size_custom():
+    instance = printer.Dummy()
+    instance.set(custom_size=True, width=8, height=7)
+
+    expected_sequence = (
+        TXT_SIZE,  # Custom text size, no normal reset
+        six.int2byte(TXT_STYLE['width'][8] + TXT_STYLE['height'][7]),
+        TXT_STYLE['flip'][False],  # Flip OFF
+        TXT_STYLE['smooth'][False],  # Smooth OFF
+        TXT_STYLE['bold'][False],  # Bold OFF
+        TXT_STYLE['underline'][0],  # Underline OFF
+        SET_FONT(b'\x00'),  # Default font
+        TXT_STYLE['align']['left'],  # Align left
+        TXT_STYLE['invert'][False]  # Inverted OFF
+    )
+
+    assert (instance.output == b''.join(expected_sequence))
+
+# Flip
+
+def test_set_flip():
+    instance = printer.Dummy()
+    instance.set(flip=True)
+
+    expected_sequence = (
+        TXT_NORMAL, TXT_STYLE['size']['normal'],  # Normal text size
+        TXT_STYLE['flip'][True],  # Flip ON
+        TXT_STYLE['smooth'][False],  # Smooth OFF
+        TXT_STYLE['bold'][False],  # Bold OFF
+        TXT_STYLE['underline'][0],  # Underline OFF
+        SET_FONT(b'\x00'),  # Default font
+        TXT_STYLE['align']['left'],  # Align left
+        TXT_STYLE['invert'][False]  # Inverted OFF
+    )
+
+    assert (instance.output == b''.join(expected_sequence))
+
+# Smooth
+
+def test_smooth():
+    instance = printer.Dummy()
+    instance.set(smooth=True)
+
+    expected_sequence = (
+        TXT_NORMAL, TXT_STYLE['size']['normal'],  # Normal text size
+        TXT_STYLE['flip'][False],  # Flip OFF
+        TXT_STYLE['smooth'][True],  # Smooth ON
+        TXT_STYLE['bold'][False],  # Bold OFF
+        TXT_STYLE['underline'][0],  # Underline OFF
+        SET_FONT(b'\x00'),  # Default font
+        TXT_STYLE['align']['left'],  # Align left
+        TXT_STYLE['invert'][False]  # Inverted OFF
+    )
+
+    assert(instance.output == b''.join(expected_sequence))
+
+
+# Type
+
+
+def test_set_bold():
+    instance = printer.Dummy()
+    instance.set(bold=True)
+
+    expected_sequence = (
+        TXT_NORMAL, TXT_STYLE['size']['normal'],  # Normal text size
+        TXT_STYLE['flip'][False],  # Flip OFF
+        TXT_STYLE['smooth'][False],  # Smooth OFF
+        TXT_STYLE['bold'][True],  # Bold ON
+        TXT_STYLE['underline'][0],  # Underline OFF
+        SET_FONT(b'\x00'),  # Default font
+        TXT_STYLE['align']['left'],  # Align left
+        TXT_STYLE['invert'][False]  # Inverted OFF
+    )
+
+    assert (instance.output == b''.join(expected_sequence))
+
+
+def test_set_underline():
+    instance = printer.Dummy()
+    instance.set(underline=1)
+
+    expected_sequence = (
+        TXT_NORMAL, TXT_STYLE['size']['normal'],  # Normal text size
+        TXT_STYLE['flip'][False],  # Flip OFF
+        TXT_STYLE['smooth'][False],  # Smooth OFF
+        TXT_STYLE['bold'][False],  # Bold OFF
+        TXT_STYLE['underline'][1],  # Underline ON, type 1
+        SET_FONT(b'\x00'),  # Default font
+        TXT_STYLE['align']['left'],  # Align left
+        TXT_STYLE['invert'][False]  # Inverted OFF
+    )
+
+    assert (instance.output == b''.join(expected_sequence))
+
+
+def test_set_underline2():
+    instance = printer.Dummy()
+    instance.set(underline=2)
+
+    expected_sequence = (
+        TXT_NORMAL, TXT_STYLE['size']['normal'],  # Normal text size
+        TXT_STYLE['flip'][False],  # Flip OFF
+        TXT_STYLE['smooth'][False],  # Smooth OFF
+        TXT_STYLE['bold'][False],  # Bold OFF
+        TXT_STYLE['underline'][2],  # Underline ON, type 2
+        SET_FONT(b'\x00'),  # Default font
+        TXT_STYLE['align']['left'],  # Align left
+        TXT_STYLE['invert'][False]  # Inverted OFF
+    )
+
+    assert (instance.output == b''.join(expected_sequence))
+
+
+# Align
+
+def test_align_center():
+    instance = printer.Dummy()
+    instance.set(align='center')
+
+    expected_sequence = (
+        TXT_NORMAL, TXT_STYLE['size']['normal'],  # Normal text size
+        TXT_STYLE['flip'][False],  # Flip OFF
+        TXT_STYLE['smooth'][False],  # Smooth OFF
+        TXT_STYLE['bold'][False],  # Bold OFF
+        TXT_STYLE['underline'][0],  # Underline OFF
+        SET_FONT(b'\x00'),  # Default font
+        TXT_STYLE['align']['center'],  # Align center
+        TXT_STYLE['invert'][False]  # Inverted OFF
+    )
+
+    assert(instance.output == b''.join(expected_sequence))
+
+
+def test_align_right():
+    instance = printer.Dummy()
+    instance.set(align='right')
+
+    expected_sequence = (
+        TXT_NORMAL, TXT_STYLE['size']['normal'],  # Normal text size
+        TXT_STYLE['flip'][False],  # Flip OFF
+        TXT_STYLE['smooth'][False],  # Smooth OFF
+        TXT_STYLE['bold'][False],  # Bold OFF
+        TXT_STYLE['underline'][0],  # Underline OFF
+        SET_FONT(b'\x00'),  # Default font
+        TXT_STYLE['align']['right'],  # Align right
+        TXT_STYLE['invert'][False]  # Inverted OFF
+    )
+
+    assert(instance.output == b''.join(expected_sequence))
+
+
+# Densities
+
+def test_densities():
+
+    for density in range(8):
+        instance = printer.Dummy()
+        instance.set(density=density)
+
+        expected_sequence = (
+            TXT_NORMAL, TXT_STYLE['size']['normal'],  # Normal text size
+            TXT_STYLE['flip'][False],  # Flip OFF
+            TXT_STYLE['smooth'][False],  # Smooth OFF
+            TXT_STYLE['bold'][False],  # Bold OFF
+            TXT_STYLE['underline'][0],  # Underline OFF
+            SET_FONT(b'\x00'),  # Default font
+            TXT_STYLE['align']['left'],  # Align left
+            TXT_STYLE['density'][density],  # Custom density from 0 to 8
+            TXT_STYLE['invert'][False]  # Inverted OFF
+        )
+
+        assert(instance.output == b''.join(expected_sequence))
+
+
+# Invert
+
+def test_invert():
+    instance = printer.Dummy()
+    instance.set(invert=True)
+
+    expected_sequence = (
+        TXT_NORMAL, TXT_STYLE['size']['normal'],  # Normal text size
+        TXT_STYLE['flip'][False],  # Flip OFF
+        TXT_STYLE['smooth'][False],  # Smooth OFF
+        TXT_STYLE['bold'][False],  # Bold OFF
+        TXT_STYLE['underline'][0],  # Underline OFF
+        SET_FONT(b'\x00'),  # Default font
+        TXT_STYLE['align']['left'],  # Align left
+        TXT_STYLE['invert'][True]  # Inverted ON
+    )
+
+    assert(instance.output == b''.join(expected_sequence))
--- a/test/test_function_softbarcode.py
+++ b/test/test_function_softbarcode.py
@@ -0,0 +1,16 @@
+#!/usr/bin/python
+from __future__ import absolute_import
+from __future__ import division
+from __future__ import print_function
+from __future__ import unicode_literals
+
+import escpos.printer as printer
+import pytest
+
+
+def test_soft_barcode():
+    """just execute soft_barcode
+    """
+    instance = printer.Dummy()
+    instance.soft_barcode("ean8", "1234")
+
--- a/test/test_function_text.py
+++ b/test/test_function_text.py
@@ -39,3 +39,27 @@ def test_block_text():
        "All the presidents men were eating falafel for breakfast.", font='a')
    assert printer.output == \
        b'All the presidents men were eating falafel\nfor breakfast.'
+
+
+def test_textln():
+    printer = get_printer()
+    printer.textln('hello, world')
+    assert printer.output == b'hello, world\n'
+
+
+def test_textln_empty():
+    printer = get_printer()
+    printer.textln()
+    assert printer.output == b'\n'
+
+
+def test_ln():
+    printer = get_printer()
+    printer.ln()
+    assert printer.output == b'\n'
+
+
+def test_multiple_ln():
+    printer = get_printer()
+    printer.ln(3)
+    assert printer.output == b'\n\n\n'
--- a/test/test_load_module.py
+++ b/test/test_load_module.py
@@ -12,30 +12,10 @@ from __future__ import division
 from __future__ import print_function
 from __future__ import unicode_literals

-from nose.tools import with_setup
-
 import escpos.printer as printer
-import os
-
-devfile = 'testfile'


-def setup_testfile():
-    """create a testfile as devfile"""
-    fhandle = open(devfile, 'a')
-    try:
-        os.utime(devfile, None)
-    finally:
-        fhandle.close()
-
-
-def teardown_testfile():
-    """destroy testfile again"""
-    os.remove(devfile)
-
-
-@with_setup(setup_testfile, teardown_testfile)
 def test_instantiation():
    """test the instantiation of a escpos-printer class and basic printing"""
-    instance = printer.File(devfile=devfile)
+    instance = printer.Dummy()
    instance.text('This is a test\n')
--- a/test/test_printer_file.py
+++ b/test/test_printer_file.py
@@ -16,7 +16,7 @@ from __future__ import unicode_literals
 import six

 import pytest
-from hypothesis import given
+from hypothesis import given, settings
 from hypothesis.strategies import text

 import escpos.printer as printer
@@ -27,6 +27,8 @@ else:
    mock_open_call = '__builtin__.open'


+@pytest.mark.skip("this test is broken and has to be fixed or discarded")
+@settings(use_coverage=False)
@given(path=text())
 def test_load_file_printer(mocker, path):
    """test the loading of the file-printer"""
@@ -37,6 +39,8 @@ def test_load_file_printer(mocker, path):
    mock_open.assert_called_with(path, "wb")


+@pytest.mark.skip("this test is broken and has to be fixed or discarded")
+@settings(deadline=None, use_coverage=False)
@given(txt=text())
 def test_auto_flush(mocker, txt):
    """test auto_flush in file-printer"""
@@ -57,6 +61,8 @@ def test_auto_flush(mocker, txt):
    assert mock_device.flush.called


+@pytest.mark.skip("this test is broken and has to be fixed or discarded")
+@settings(deadline=None, use_coverage=False)
@given(txt=text())
 def test_flush_on_close(mocker, txt):
    """test flush on close in file-printer"""
--- a/test/test_raise_arbitrary_error.py
+++ b/test/test_raise_arbitrary_error.py
@@ -0,0 +1,32 @@
+#!/usr/bin/python
+"""test the raising of errors with the error module
+
+:author: `Patrick Kanzler <patrick.kanzler@fablab.fau.de>`_
+:organization: `python-escpos <https://github.com/python-escpos>`_
+:copyright: Copyright (c) 2017 `python-escpos <https://github.com/python-escpos>`_
+:license: MIT
+"""
+
+from __future__ import absolute_import
+from __future__ import division
+from __future__ import print_function
+from __future__ import unicode_literals
+
+import pytest
+import escpos
+import escpos.exceptions
+
+
+def test_raise_error_wrongly():
+    """raise error the wrong way
+
+    should reproduce https://github.com/python-escpos/python-escpos/issues/257
+    """
+    with pytest.raises(AttributeError):
+        raise escpos.Error("This should raise an AttributeError.")
+
+
+def tests_raise_error():
+    """raise error the right way"""
+    with pytest.raises(escpos.exceptions.Error):
+        raise escpos.exceptions.Error("This should raise an error.")
--- a/tox.ini
+++ b/tox.ini
@@ -7,17 +7,20 @@ deps = nose
       coverage
       scripttest
       mock
-       pytest
+       pytest!=3.2.0,!=3.3.0
       pytest-cov
       pytest-mock
-       hypothesis
+       hypothesis!=3.56.9
+       viivakoodi
 commands = py.test --cov escpos
+passenv = ESCPOS_CAPABILITIES_PICKLE_DIR ESCPOS_CAPABILITIES_FILE CI TRAVIS TRAVIS_* APPVEYOR APPVEYOR_* CODECOV_*

 [testenv:docs]
 basepython = python
 changedir = doc
 deps = sphinx>=1.5.1
       setuptools_scm
+       viivakoodi
 commands = sphinx-build -W -b html -d {envtmpdir}/doctrees .  {envtmpdir}/html

 [testenv:flake8]
Author	SHA1	Message	Date
Patrick Kanzler	0051c876bf	Merge pull request #298 from python-escpos/development release v3.0a4	2018-05-15 23:12:17 +02:00
Patrick Kanzler	854759d312	update changelog	2018-05-15 22:48:33 +02:00
Patrick Kanzler	a0343c66af	update capabilities-data	2018-05-15 22:07:12 +02:00
Patrick Kanzler	6c94f88c24	improve platform independence (#296 ) * add os.devnull for platform independence fixes #288 * add test for soft_barcode * open devnull as binary * add version identifier to pickle	2018-05-15 01:03:07 +02:00
Patrick Kanzler	6fb23d6826	remove test from setup.py (#297 ) fixes #294	2018-05-15 00:34:43 +02:00
Patrick Kanzler	f649814091	Fix travis-builds and tests in general (#295 ) * add explicit location of capabilities.json for travis * pass on env variables in tox builds * drop support for python 3.3 and remove python3.3 from supported versions list	2018-05-14 18:06:31 +02:00
Patrick Kanzler	47b4d41b28	use package for tempdir cherry-picked from `8494cca526` in #274	2018-05-13 18:52:39 +02:00
Patrick Kanzler	599f4f3ca5	add new authors	2018-05-13 18:44:47 +02:00
primax79	d085e5c467	parameter for implementation of nonnative qrcode (#289 )	2018-05-13 18:42:41 +02:00
kennedy	b418302311	Modified submodule to always pull from master branch (#283 )	2018-05-13 18:42:07 +02:00
Patrick Kanzler	f6acb72bbe	Merge branch 'fix-travis-builds' into development	2018-05-13 18:40:57 +02:00
Patrick Kanzler	0c9856c1f6	disable QR test for image	2018-05-13 18:26:48 +02:00
Patrick Kanzler	a748563395	blacklist hypothesis version	2018-05-13 18:04:48 +02:00
Patrick Kanzler	b84e280efb	disable broken tests	2018-05-13 17:32:52 +02:00
Thijs Triemstra	4390dc4a9c	fix is_online() (#282 ) * fix is_online * fix sphinx formatting * reword	2018-05-02 09:25:04 +02:00
Thijs Triemstra	6e09fd1e97	fix typo	2018-04-26 07:22:37 +02:00
Thijs Triemstra	100c6b5e89	fix typo (#279 )	2018-02-07 22:17:18 +01:00
Christoph Heuel	26d72a69f0	Feature/clear content in dummy printer (#271 ) 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.	2017-12-04 00:13:28 +01:00
Patrick Kanzler	01e28bbcf6	ammend blacklisting from `cd1bcb57b4` the last comment was a bit rushed and did not properly blacklist both bad versions of pytest	2017-12-03 23:49:46 +01:00
Patrick Kanzler	2a7e2a6a36	blacklist pytest 3.3.0 see pytest-dev/pytest#2957	2017-12-03 23:43:23 +01:00
reck	3c3dab95f5	raise exception when TypeError occurs in cashdraw (#268 )	2017-12-03 23:21:29 +01:00
Patrick Kanzler	d1e7052fa1	Merge pull request #266 from python-escpos/development release v3.0a3	2017-10-08 22:45:54 +02:00
Patrick Kanzler	10e1dfe1d1	update changelog	2017-10-08 22:26:55 +02:00
Patrick Kanzler	cd1bcb57b4	remove bugtrack_url this is not supported by setuptools	2017-10-08 22:12:53 +02:00
Patrick Kanzler	d6d12f99d4	improve test - tests raising of error #257	2017-10-08 21:53:36 +02:00
Patrick Kanzler	128221363f	reproduce #257	2017-10-08 21:53:36 +02:00
Patrick Kanzler	6b0b1371e5	fix layout in File-printer-section	2017-10-08 21:31:45 +02:00
Patrick Kanzler	44f01a212b	fix docs failing due to pickle protocol in mixed env 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.	2017-10-08 21:08:13 +02:00
Lucy Linder	456f5b7aa6	Feature/check barcodes (#255 ) * 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	2017-10-08 20:05:18 +02:00
Patrick Kanzler	d78a6f1699	completely fix tests 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	2017-09-27 10:38:42 +02:00
Patrick Kanzler	5e784c060a	fix tests failing (for now) 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.	2017-09-27 10:29:19 +02:00
Patrick Kanzler	1439b14686	tell sort to ignore case	2017-08-31 13:43:07 +02:00
Romain Porte	b648cfd67f	First attempt at centering images and QRs (#250 ) 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	2017-08-31 09:25:35 +02:00
Sergio	50c627fbb0	Pickling capabilities for faster start up times. (#252 ) 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.	2017-08-31 09:07:26 +02:00
Sergio Pulgarin	99034d0575	Fixed outdated example file: should be font 'b' not 'B' Updated AUTHORS using script.	2017-08-31 08:38:32 +02:00
Patrick Kanzler	19663ec574	fix cut function in example	2017-08-10 21:54:52 +02:00
Patrick Kanzler	281eea125f	fix abstract read-function read does not need msg-parameter	2017-08-10 21:51:51 +02:00
Patrick Kanzler	5bed0bfbb4	fix name of pyyaml for PyPi	2017-08-09 10:41:25 +02:00
Patrick Kanzler	f12470d3cd	update contributing	2017-08-08 13:37:30 +02:00
Patrick Kanzler	fb0e4c28ba	update README	2017-08-08 13:30:16 +02:00
Patrick Kanzler	af29fcca77	alpha release v3.0a2	2017-08-04 16:48:36 +02:00
Patrick Kanzler	f8b269d859	update changelog for next release	2017-08-04 16:30:31 +02:00
Patrick Kanzler	c259263f26	blacklist pytest 3.2.0 because it breaks our tests see pytest-dev/pytest#2644 for reference	2017-08-04 15:17:05 +02:00
Patrick Kanzler	27c843935f	add viivakoodi to dep in tox-file	2017-08-04 15:17:05 +02:00
Patrick Kanzler	f3da6a9725	remove quanitifed-code-badge	2017-08-01 17:42:34 +02:00
Romain Porte	b64b534394	Add methods for simpler newlines (#246 )	2017-08-01 17:09:24 +02:00
Patrick Kanzler	81426ab6dc	fix whitespace	2017-08-01 12:27:53 +02:00
Patrick Kanzler	df1193ab35	implement read for Serial	2017-08-01 11:20:00 +02:00
mrwunderbar666	b494c9a4bd	Weather Forecast Example Script (#239 ) * Example Weather forecast script Used Adafruits example as base and adapted it for python-escpos Weather icons taken from http://adamwhitcroft.com/climacons/ * Weather Icons from Adam Whitcroft Weather Icons from http://adamwhitcroft.com/climacons/ * update authors * Minor improvements * Weather Script Debugged Added one more Icon Attributed Icons in readme.md changed folder structure * Change formatting * Fixed pathing to graphics issue * fixed image size * autopep8 to clean up the code	2017-08-01 11:13:45 +02:00
Patrick Kanzler	f8a2174108	fix typo	2017-07-27 23:06:59 +02:00
csoft2k	1f57b04974	Paper sensor querying command (#242 ) The DLE EOT command allows querying the status of several features of the printer. Added to the online/offline status developed in #237, this commit adds a paper sensor querying. Tested with an Epson TM-T20II, which only has an end-paper sensor. The near-end paper sensor should be tested with a compatible printer. However, the implementation is quite straight-forward.	2017-07-27 23:05:50 +02:00
Romain Porte	c7080165a7	Added test script for hard and soft barcodes (#243 )	2017-07-27 22:45:51 +02:00
Patrick Kanzler	cf0cf127fe	add changelog for next release	2017-07-27 16:50:41 +02:00
csoft2k	82c67aa646	Fix tabs behaviour (#238 ) The changes done in this commit should help with the open issues: #5, #27 and #161. The old implementation lacked the NUL char at the end of the command, as defined on the Epson ESC/POS Reference Guide (see https://reference.epson-biz.com/modules/ref_escpos/index.php?content_id=53 ). Also, the horizontal tab control character (CTL_HT) shouldn't be there. This implementation allows setting up to 32 tabs with a given tab width. Both values are checked to be in the valid ranges defined on the guide. Also, the TabPosError exception text has been rewritten to define the stated above.	2017-07-26 10:01:08 +02:00
Romain Porte	9e47ff2505	Added test for cut without feed, fixed raw code for it	2017-07-26 09:09:32 +02:00
Romain Porte	9bc3b30a60	Optional feed for cut (closes #213 )	2017-07-26 09:09:32 +02:00
Romain Porte	5bd6dcf471	Ensure QR codes have a border large enough (#235 ) * Ensure QR codes have a border large enough (The QR code spec requires a border at least 4box_size thick but we can't just set border=16 because that results in a QR code more than 255px tall and I'm not yet ready to use fullimage() as a backend for it) This fix was originally commited by Stephan Sokolow on 2014-05-22 Let the user print stuff using qr example * fix tests	2017-07-24 15:04:54 +02:00
csoft2k	89dfb6cf86	Added the DLE EOT querying command. (#237 ) * Added the DLE EOT querying command. Added a function to check whether the printer is online or not, as well as a reading method for USB printers. * Update AUTHORS * Add entry to .mailmap * currently USB only	2017-07-24 13:57:02 +02:00
Patrick Kanzler	662aa30f4b	Update readme list of dependencies add viivakoodi and links	2017-06-22 15:54:21 +02:00
TAHRI Ahmed	efec3e508c	Fix SerialException when trying to close device on __del__ without verifing if is actually opened.	2017-06-19 13:42:46 +02:00
Patrick Kanzler	c3e952befa	cat authorsfiles during check	2017-06-19 11:15:04 +00:00
Patrick Kanzler	83b426f5fd	Merge pull request #222 from MicroJoe/software-barcode First implementation of software barcode	2017-06-19 12:57:05 +02:00
Romain Porte	b963c5668b	Using viivakoodi instead of pyBarcode	2017-06-11 10:06:57 +02:00
Patrick Kanzler	4882c31531	Clarifiy and update usage.rst relevant to #230 clarifies the config-file in the usage.rst	2017-06-10 23:35:26 +00:00
Patrick Kanzler	7c17141fb2	integrate author check into travis	2017-05-26 02:36:16 +02:00
Romain Porte	3f9d44ff15	Added authors file and generate_authors.sh (#227 ) * Added authors file Generated using `git shortlog -s -n` and sorted by alphabetical order using vim. * Added generate_authors.sh script and ordered author list * Regenerated AUTHORS with .mailmap	2017-05-26 00:27:17 +02:00
Romain Porte	a069009696	Lists should not be right-espaced in reST	2017-05-24 23:57:38 +02:00
Patrick Kanzler	024b0df7d2	added new trove for 3.6 and 3.7	2017-05-24 10:58:55 +02:00
Patrick Kanzler	74ef9aed7f	add .mailmap in order to normalize shortlog	2017-05-24 10:23:01 +02:00
Romain Porte	c4dd4f2960	Added ImageWidthError and its implementation (#226 ) * Added ImageWidthError and its implementation * Added unit tests for ImageWidthError * Parse max_width to int before compare	2017-05-23 15:13:28 +02:00
Romain Porte	d348712439	PEP8 software barcode example	2017-05-22 20:25:51 +02:00
Romain Porte	22cf6ad00b	Allow users to change impl for soft_barcode	2017-05-22 20:21:35 +02:00
Patrick Kanzler	5bf2636753	rewrite to Dummy()	2017-05-22 00:57:48 +02:00
TAHRI Ahmed	1f427953a8	Preliminary support of pos 'line display' printing	2017-05-22 00:40:40 +02:00
Romain Porte	a6e1d0df00	Using booleans for handling text size	2017-05-21 22:50:07 +02:00
Romain Porte	c0b4d03692	Updated documentation of set method	2017-05-21 22:50:07 +02:00
Romain Porte	a16d6bde06	Refactor of the set method, with tests	2017-05-21 22:50:07 +02:00
Romain Porte	737cc3176e	First implementation of software barcode Actually the hardware barcode implementation is very specific and not generic enough for just adding a `soft_render=True` argument to it. This is a first work that can be improved with other commits, maybe for merging this method in the `barcode` method after some cleanup. The width, height and text_distance were set using empiric print-and-retry tests so that the generated barcode looks nice to the eye (and to the eye of an Android scanner tool. !WARNING! Printing a barcode that is too large in width will result in the printer to go crazy trying to print an image that is too large for it. This may be fixed by raising an exception in the `image` method.	2017-05-16 20:56:27 +02:00
Romain Porte	4b04a5c425	Fixed bad format of :code: in documentation	2017-05-14 21:33:43 +02:00
Patrick Kanzler	df33945458	Release v3.0a1 (#209 from python-escpos/development) Release v3.0a1	2017-03-29 16:02:10 +02:00
Patrick Kanzler	c1a7d71fd7	update changelog	2017-03-29 15:45:06 +02:00
Dmytro Katyukha	a7ee11a78c	Bugfix in `control` method. print_and_feed default `n=1`	2017-03-29 15:24:36 +02:00
Dmytro Katyukha	43e0a87a74	Updated capabilities data to new version	2017-03-29 15:24:36 +02:00
Dmytro Katyukha	abbe32f845	Refactored `cut` method. added `print_and_feed` method	2017-03-29 15:24:25 +02:00
Dmytro Katyukha	29cc8baab7	Handle cases when fullCut or partCut not available	2017-03-29 15:24:25 +02:00
Patrick Kanzler	0f33d68f3a	add doc for ESCPOS_CAPABILITIES_FILE	2017-03-27 15:30:14 +02:00
Sam Cheng	a0ef820947	add support for an ESCPOS_CAPABILITIES_FILE environment variable. This is useful in situations where package structure is changed, such as using cx-freeze	2017-03-27 14:39:49 +02:00
Patrick Kanzler	7b24df6581	remove patch-coverage because we don't use it	2017-03-23 15:35:32 +01:00
Patrick Kanzler	5078c49b3a	add github upload for travis This automatically uploads succesfull release builds into the GitHub release.	2017-02-05 15:42:09 +01:00