Start on a command-line interface to the library (still hard-codes USB ID)
(...and still needs better documentation)
This commit is contained in:
Stephan Sokolow
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64c36a74ed
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#!/usr/bin/env python2
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# -*- coding: utf-8 -*-
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"""A simple command-line interface for common python-escpos functionality
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Usage: python -m escpos.cli --help
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Dependencies:
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- DavisGoglin/python-escpos or better
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- A file named weather.png (for the 'test' subcommand)
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Reasons for using the DavisGoglin/python-escpos fork:
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- image() accepts a PIL.Image object rather than requiring me to choose
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between writing a temporary file to disk or calling a "private" method.
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- fullimage() allows me to print images of arbitrary length using slicing.
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How to print unsupported barcodes:
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barcode -b 'BARCODE' -e 'code39' -E | convert -density 200% eps:- code.png
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python test_escpos.py --images code.png
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Copyright (C) 2014 Stephan Sokolow (deitarion/SSokolow)
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Permission is hereby granted, free of charge, to any person obtaining
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a copy of this software and associated documentation files (the "Software"),
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to deal in the Software without restriction, including without limitation
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the rights to use, copy, modify, merge, publish, distribute, sublicense,
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and/or sell copies of the Software, and to permit persons to whom the
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Software is furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included
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in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
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OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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"""
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from __future__ import absolute_import
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__author__ = "Stephan Sokolow (deitarion/SSokolow)"
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__license__ = "MIT"
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import re
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from escpos import printer
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epson = printer.Usb(0x0416, 0x5011)
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# TODO: Un-hardcode this
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def _print_text_file(path):
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"""Print the given text file"""
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epson.set(align='left')
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with open(path, 'rU') as fobj:
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for line in fobj:
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epson.text(line)
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def _print_image_file(path):
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"""Print the given image file."""
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epson.fullimage(path, histeq=False, width=384)
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def print_files(args):
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"""The 'print' subcommand"""
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for path in args.paths:
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if args.images:
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_print_image_file(path)
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else:
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_print_text_file(path)
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epson.cut()
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# {{{ 'echo' Subcommand
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KNOWN_BARCODE_TYPES = ['UPC-A', 'UPC-E', 'EAN13', 'ITF']
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re_barcode_escape = re.compile(r'^%(?P<type>\S+)\s(?P<data>[0-9X]+)$')
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def echo(args): # pylint: disable=unused-argument
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"""TTY-like line-by-line keyboard-to-printer echo loop."""
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try:
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while True:
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line = raw_input()
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match = re_barcode_escape.match(line)
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if match and match.group('type') in KNOWN_BARCODE_TYPES:
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bctype, data = match.groups()
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epson.barcode(data, bctype, 48, 2, '', '')
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epson.set(align='left')
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else:
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epson.text('%s\n' % line)
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except KeyboardInterrupt:
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epson.cut()
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# }}}
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# {{{ 'test' Subcommand
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from PIL import Image, ImageDraw
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def _stall_test(width, height):
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"""Generate a pattern to detect print glitches due to vertical stalling."""
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img = Image.new('1', (width, height))
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for pos in [(x, y) for y in range(0, height) for x in range(0, width)]:
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img.putpixel(pos, not sum(pos) % 10)
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return img
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def _test_basic():
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"""The original test code from python-escpos's Usage wiki page"""
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epson.set(align='left')
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# Print text
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epson.text("TODO:\n") # pylint: disable=fixme
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epson.text("[ ] Task 1\n")
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epson.text("[ ] Task 2\n")
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# Print image
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# TODO: Bundle an image so this can be used
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# epson.image("weather.png")
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# Print QR Code (must have a white border to be scanned)
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epson.set(align='center')
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epson.text("Scan to recall TODO list") # pylint: disable=fixme
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epson.qr("http://www.example.com/")
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# Print barcode
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epson.barcode('1234567890128', 'EAN13', 32, 2, '', '')
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# Cut paper
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epson.cut()
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def _test_barcodes():
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"""Print test barcodes for all ESCPOS-specified formats."""
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for name, data in (
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# pylint: disable=bad-continuation
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('UPC-A', '123456789012\x00'),
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('UPC-E', '02345036\x00'),
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('EAN13', '1234567890128\x00'),
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('EAN8', '12345670\x00'),
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('CODE39', 'BARCODE12345678\x00'),
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('ITF', '123456\x00'),
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('CODABAR', 'A40156B'),
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# TODO: CODE93 and CODE128
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):
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# TODO: Fix the library to restore old alignment somehow
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epson.set(align='center')
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epson.text('\n%s\n' % name)
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epson.barcode(data, name, 64, 2, '', '')
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def _test_patterns(width=384, height=255):
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"""Print a set of test patterns for raster image output."""
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# Test our guess of the paper width
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img = Image.new('1', (width, height), color=1)
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draw = ImageDraw.Draw(img)
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draw.polygon(((0, 0), img.size, (0, img.size[1])), fill=0)
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epson.image(img)
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del draw, img
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# Test the consistency of printing large data and whether stall rate is
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# affected by data rate
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epson.image(_stall_test(width, height))
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epson.image(_stall_test(width / 2, height))
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def test(args):
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"""The 'test' subcommand"""
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if args.barcodes:
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_test_barcodes()
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elif args.patterns:
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_test_patterns()
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else:
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_test_basic()
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# }}}
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def main():
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"""Wrapped in a function for import and entry point compatibility"""
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# pylint: disable=bad-continuation
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import argparse
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parser = argparse.ArgumentParser(
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description="Command-line interface to python-escpos")
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subparsers = parser.add_subparsers(title='subcommands')
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echo_parser = subparsers.add_parser('echo', help='Echo the keyboard to '
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'the printer line-by-line (Exit with Ctrl+C)')
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echo_parser.set_defaults(func=echo)
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print_parser = subparsers.add_parser('print', help='Print the given files')
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print_parser.add_argument('--images', action='store_true',
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help="Provided files are images rather than text files.")
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print_parser.add_argument('paths', metavar='path', nargs='+')
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print_parser.set_defaults(func=print_files)
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test_parser = subparsers.add_parser('test', help='Print test patterns')
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test_modes = test_parser.add_mutually_exclusive_group()
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test_modes.add_argument('--barcodes', action='store_true',
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help="Test supported barcode types (Warning: Some printers must be "
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"reset after attempting an unsupported barcode type.)")
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test_modes.add_argument('--patterns', action='store_true',
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help="Print test patterns")
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test_parser.set_defaults(func=test)
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args = parser.parse_args()
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args.func(args)
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if __name__ == '__main__':
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main()
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# vim: set sw=4 sts=4 :
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