alpha release v3.0a2

.mailmap

@@ -0,0 +1,11 @@
+<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>
+csoft2k <csoft2k@hotmail.com>

.travis.yml

@@ -1,6 +1,8 @@
 language: python
 sudo: false
 cache: pip
+git:
+  depth: 100000
 addons:
   apt:
     packages:
@@ -37,6 +39,7 @@ matrix:
     - python: pypy3
 before_install:
     - pip install tox codecov 'sphinx>=1.5.1'
+    - ./doc/generate_authors.sh --check
 script:
     - tox
     - codecov

AUTHORS

@@ -0,0 +1,28 @@
+Ahmed Tahri
+Asuki Kono
+belono
+Christoph Heuel
+Cody (Quantified Code Bot)
+csoft2k
+Curtis // mashedkeyboard
+Davis Goglin
+Dean Rispin
+Dmytro Katyukha
+Hark
+Joel Lehtonen
+Kristi
+ldos
+Manuel F Martinez
+Michael Billington
+Michael Elsdörfer
+mrwunderbar666
+Nathan Bookham
+Patrick Kanzler
+Qian Linfeng
+Renato Lorenzi
+Romain Porte
+Sam Cheng
+Stephan Sokolow
+Thijs Triemstra
+Thomas van den Berg
+ysuolmai

CHANGELOG.rst

@@ -2,6 +2,37 @@
 Changelog
 *********
 
+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

CONTRIBUTING.rst

@@ -12,6 +12,15 @@ 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.
+
 Style-Guide
 -----------
 

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

doc/generate_authors.sh

@@ -0,0 +1,19 @@
+#!/bin/sh
+
+GENLIST=$(git shortlog -s -n | cut -f2 | sort)
+AUTHORSFILE="$(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
+

doc/requirements.txt

@@ -5,3 +5,4 @@ pyserial
 sphinx-rtd-theme
 setuptools-scm
 docutils>=0.12
+viivakoodi

doc/user/usage.rst

@@ -1,6 +1,7 @@
 *****
 Usage
 *****
+:Last Reviewed: 2017-06-10
 
 Define your printer
 -------------------
@@ -133,13 +134,13 @@ format. For windows it is probably at::
 
 And for linux::
 
-        $HOME/.config/python-escpos/config.yaml
+    $HOME/.config/python-escpos/config.yaml
 
 If you aren't sure, run::
 
-        from escpos import config
+    from escpos import config
-        c = config.Config()
+    c = config.Config()
-        c.load()
+    c.load()
 
 If it can't find the configuration file in the default location, it will tell
 you where it's looking. You can always pass a path, or a list of paths, to
@@ -147,9 +148,9 @@ the ``load()`` method.
 
 To load the configured printer, run::
 
-        from escpos import config
+    from escpos import config
-        c = config.Config()
+    c = config.Config()
-        printer = c.printer()
+    printer = c.printer()
 
 
 The printer section
@@ -157,23 +158,34 @@ 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::
 
-        printer:
+    printer:
-                type: File
+            type: File
-                devfile: /dev/someprinter
+            devfile: /dev/someprinter
 
 And for a network printer::
 
-        printer:
+    printer:
-                type: network
+            type: Network
-                host: 127.0.0.1
+            host: 127.0.0.1
-                port: 9000
+            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
 -------------------

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')

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.

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)

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')

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")

setup.py

@@ -100,6 +100,8 @@ setup(
         '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',
@@ -115,7 +117,8 @@ setup(
         'pyyaml',
         'argparse',
         'argcomplete',
-        'future'
+        'future',
+        'viivakoodi>=0.8'
     ],
     setup_requires=[
         'setuptools_scm',
@@ -123,7 +126,7 @@ setup(
     tests_require=[
         'jaconv',
         'tox',
-        'pytest',
+        'pytest!=3.2.0',
         'pytest-cov',
         'pytest-mock',
         'nose',

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,
-                  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_STYLE = {
-TXT_UNDERL_OFF = ESC + b'\x2d\x00'  # Underline font OFF
+    'bold': {
-TXT_UNDERL_ON  = ESC + b'\x2d\x01'  # Underline font 1-dot ON
+        False: ESC + b'\x45\x00',               # Bold font OFF
-TXT_UNDERL2_ON = ESC + b'\x2d\x02'  # Underline font 2-dot ON
+        True: ESC + b'\x45\x01'                 # Bold font ON
-TXT_BOLD_OFF   = ESC + b'\x45\x00'  # Bold font OFF
+    },
-TXT_BOLD_ON    = ESC + b'\x45\x01'  # Bold font ON
+    'underline': {
-TXT_ALIGN_LT   = ESC + b'\x61\x00'  # Left justification
+        0: ESC + b'\x2d\x00',                   # Underline font OFF
-TXT_ALIGN_CT   = ESC + b'\x61\x01'  # Centering
+        1: ESC + b'\x2d\x01',                   # Underline font 1-dot ON
-TXT_ALIGN_RT   = ESC + b'\x61\x02'  # Right justification
+        2: ESC + b'\x2d\x02'                    # Underline font 2-dot ON
-TXT_INVERT_ON  = GS  + b'\x42\x01'  # Inverse Printing ON
+    },
-TXT_INVERT_OFF = GS  + b'\x42\x00'  # Inverse Printing OFF
+    '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
+    },
+    '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 = {
@@ -206,13 +250,11 @@ 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
+# Status Command
-PD_N50 = GS + b'\x7c\x00'  # Printing Density -50%
+RT_STATUS = DLE + EOT
-PD_N37 = GS + b'\x7c\x01'  # Printing Density -37.5%
+RT_STATUS_ONLINE = RT_STATUS +  b'\x01'
-PD_N25 = GS + b'\x7c\x02'  # Printing Density -25%
+RT_STATUS_PAPER = RT_STATUS +  b'\x04'
-PD_N12 = GS + b'\x7c\x03'  # Printing Density -12.5%
+RT_MASK_ONLINE = 8
-PD_0   = GS + b'\x7c\x04'  # Printing Density  0%
+RT_MASK_PAPER = 18
-PD_P50 = GS + b'\x7c\x08'  # Printing Density +50%
+RT_MASK_LOWPAPER = 30
-PD_P37 = GS + b'\x7c\x07'  # Printing Density +37.5%
+RT_MASK_NOPAPER = 114
-PD_P25 = GS + b'\x7c\x06'  # Printing Density +25%
-PD_P12 = GS + b'\x7c\x05'  # Printing Density +12.5%

src/escpos/escpos.py

@@ -18,22 +18,29 @@ from __future__ import unicode_literals
 import qrcode
 import textwrap
 import six
+import time
+
+import barcode
+from barcode.writer import ImageWriter
 
 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
 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_SIZE, TXT_NORMAL
-from .constants import TXT_FLIP_OFF, TXT_FLIP_ON, TXT_2WIDTH, TXT_2HEIGHT, TXT_4SQUARE
+from .constants import SET_FONT
-from .constants import TXT_UNDERL_OFF, TXT_UNDERL_ON, TXT_BOLD_OFF, TXT_BOLD_ON, SET_FONT, TXT_UNDERL2_ON
+from .constants import LINESPACING_FUNCS, LINESPACING_RESET
-from .constants import TXT_INVERT_OFF, TXT_INVERT_ON, LINESPACING_FUNCS, LINESPACING_RESET
+from .constants import LINE_DISPLAY_OPEN, LINE_DISPLAY_CLEAR, LINE_DISPLAY_CLOSE
-from .constants import PD_0, PD_N12, PD_N25, PD_N37, PD_N50, PD_P50, PD_P37, PD_P25, PD_P12
 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
 
@@ -73,6 +80,12 @@ class Escpos(object):
         """
         pass
 
+    def _read(self, msg):
+        """ 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):
         """ Print an image
@@ -99,6 +112,17 @@ class Escpos(object):
         """
         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))
+        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:
@@ -188,7 +212,10 @@ class Escpos(object):
             qr_img = qr_code.make_image()
             im = qr_img._img.convert("RGB")
             # Convert the RGB image in printable image
+            self.text('\n')
             self.image(im)
+            self.text('\n')
+            self.text('\n')
             return
         # Native 2D code printing
         cn = b'1'  # Code type for QR code
@@ -224,9 +251,9 @@ 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)
@@ -356,7 +383,7 @@ class Escpos(object):
 
         # 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 +423,31 @@ 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)
+
+        my_code.write("/dev/null", {
+            '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 +460,113 @@ 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,
+    def set(self, align='left', font='a', bold=False, underline=0, width=1,
-            height=1, density=9, invert=False, smooth=False, flip=False):
+            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
+            * 'center'
-            * LEFT
+            * 'left'
-            * RIGHT
+            * '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.
+            special values 'a' or 'b', referring to fonts 0 and 1.
-        :param text_type: text type, possible values are:
+        :param bold: text in bold, *default*: False
-
+        :param underline: underline mode for text, decimal range 0-2,  *default*: 0
-            * B for bold
+        :param double_height: doubles the height of the text
-            * U for underlined
+        :param double_width: doubles the width of the text
-            * U2 for underlined, version 2
+        :param custom_size: uses custom size specified by width and height
-            * BU for bold and underlined
+            parameters. Cannot be used with double_width or double_height.
-            * BU2 for bold and underlined, version 2
+        :param width: text width multiplier when custom_size is used, decimal range 1-8,  *default*: 1
-            * NORMAL for normal text
+        :param height: text height multiplier when custom_size is used, decimal range 1-8, *default*: 1
-
-            *default*: NORMAL
-        :param width: text width multiplier, decimal range 1-8,  *default*: 1
-        :param height: text height multiplier, 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 invert: bool
-        """
-        # 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]))
-        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)
-        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))))
 
-        # Align
+        :type font: str
-        if align.upper() == "CENTER":
+        :type invert: bool
-            self._raw(TXT_ALIGN_CT)
+        :type bold: bool
-        elif align.upper() == "RIGHT":
+        :type underline: bool
-            self._raw(TXT_ALIGN_RT)
+        :type smooth: bool
-        elif align.upper() == "LEFT":
+        :type flip: bool
-            self._raw(TXT_ALIGN_LT)
+        :type custom_size: bool
-        # Density
+        :type double_width: bool
-        if density == 0:
+        :type double_height: bool
-            self._raw(PD_N50)
+        :type align: str
-        elif density == 1:
+        :type width: int
-            self._raw(PD_N37)
+        :type height: int
-        elif density == 2:
+        :type density: int
-            self._raw(PD_N25)
+        """
-        elif density == 3:
+
-            self._raw(PD_N12)
+        if custom_size:
-        elif density == 4:
+            if 1 <= width <= 8 and 1 <= height <= 8 and isinstance(width, int) and\
-            self._raw(PD_0)
+              isinstance(height, int):
-        elif density == 5:
+                size_byte = TXT_STYLE['width'][width] + TXT_STYLE['height'][height]
-            self._raw(PD_P12)
+                self._raw(TXT_SIZE + six.int2byte(size_byte))
-        elif density == 6:
+            else:
-            self._raw(PD_P25)
+                raise SetVariableError()
-        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_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_STYLE['size']['normal'])
+
+        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 +597,7 @@ class Escpos(object):
 
         self._raw(LINESPACING_FUNCS[divisor] + six.int2byte(spacing))
 
-    def cut(self, mode='FULL'):
+    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
@@ -574,8 +607,14 @@ class Escpos(object):
         .. todo:: Check this function on TM-T88II.
 
         :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')
         """
+
+        if not feed:
+            self._raw(GS + b'V' + six.int2byte(66) + b'\x00')
+            return
+
         self.print_and_feed(6)
 
         mode = mode.upper()
@@ -612,6 +651,41 @@ class Escpos(object):
             except:
                 raise CashDrawerError()
 
+    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
 
@@ -644,7 +718,7 @@ class Escpos(object):
         else:
             raise ValueError("n must be betwen 0 and 255")
 
-    def control(self, ctl, pos=4):
+    def control(self, ctl, count=5, tab_size=8):
         """ Feed control sequences
 
         :param ctl: string for the following control sequences:
@@ -655,7 +729,8 @@ 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 position
@@ -666,13 +741,16 @@ class Escpos(object):
         elif ctl.upper() == "CR":
             self._raw(CTL_CR)
         elif ctl.upper() == "HT":
-            if not (1 <= pos <= 16):
+            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 + six.int2byte(pos))
+                self._raw(CTL_SET_HT)
-
+                for iterator in range(1, count):
-            self._raw(CTL_HT)
+                    self._raw(six.int2byte(iterator * tab_size))
+                self._raw(NUL)
         elif ctl.upper() == "VT":
             self._raw(CTL_VT)
 
@@ -699,6 +777,41 @@ 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 printer its online status.
+        When online, returns True; False otherwise.
+        :rtype: bool: True if online, False if offline."""
+        status = self.query_status(RT_STATUS_ONLINE)
+        if len(status) == 0:
+            return False
+        return not (status & RT_MASK_ONLINE)
+
+    def paper_status(self):
+        """ Queries the printer its paper status.
+        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.
+        :rtype: int: 2: Paper is adequate. 1: Paper ending. 0: No paper."""
+        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

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`
@@ -104,6 +105,20 @@ 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 +150,8 @@ 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`.

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()
 

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)

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 +143,22 @@ 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')
+
+
+def test_width_too_large():
+    """
+    Test printing an image that is too large in width.
+    """
+    instance = printer.Dummy()
+    instance.profile.profile_data = {
+        'media': {
+            'width': {
+                'pixels': 384
+            }
+        }
+    }
+
+    with pytest.raises(ImageWidthError):
+        instance.image(Image.new("RGB", (385, 200)))
+
+    instance.image(Image.new("RGB", (384, 200)))

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')
+

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()
+    assert(instance.output == b'\x1B\x63\x35\x00')
-    with open(devfile, "rb") as f:
-        assert(f.read() == 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()
+    assert(instance.output == b'\x1B\x63\x35\x01')
-    with open(devfile, "rb") as f:
-        assert(f.read() == b'\x1B\x63\x35\x01')

test/test_function_qr_native.py

@@ -86,9 +86,11 @@ def test_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)
 
 

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))

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'

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')

tox.ini

@@ -7,10 +7,11 @@ deps = nose
        coverage
        scripttest
        mock
-       pytest
+       pytest!=3.2.0
        pytest-cov
        pytest-mock
        hypothesis
+       viivakoodi
 commands = py.test --cov escpos
 
 [testenv:docs]
@@ -18,6 +19,7 @@ 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]