mirror of
https://github.com/NaitLee/Cat-Printer.git
synced 2025-05-15 23:00:15 -07:00
717 lines
25 KiB
Python
717 lines
25 KiB
Python
'Cat-Printer: Core driver'
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import os
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import io
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import sys
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import argparse
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import subprocess
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import asyncio
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import platform
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class ExitCodes():
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'Exit codes'
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Success = 0
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GeneralError = 1
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InvalidArgument = 2
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PrinterError = 64
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IncompleteProgram = 128
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MissingDependency = 129
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def info(*args, **kwargs):
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'Just `print` to `stdout`'
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print(*args, **kwargs, file=sys.stdout, flush=True)
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def error(*args, exception=None, **kwargs):
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'`print` to `stderr`, or optionally raise an exception'
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if exception is not None:
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raise exception(*args)
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else:
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print(*args, **kwargs, file=sys.stderr, flush=True)
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def fatal(*args, code=ExitCodes.GeneralError, **kwargs):
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'`print` to `stderr`, and exit with `code`'
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print(*args, **kwargs, file=sys.stderr, flush=True)
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sys.exit(code)
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# Do i18n first
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try:
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from printer_lib.i18n import I18nLib
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for path in ('www/lang', 'lang'):
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if os.path.exists(path):
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I18n = I18nLib(path)
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break
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else: # if didn't break
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error('Warning: No languages were found', exception=None)
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except ImportError:
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fatal(
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'Folder "printer_lib" is incomplete or missing, please check.',
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code=ExitCodes.IncompleteProgram
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)
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# Test if `pyobjc` is there on MacOS
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if platform.system() == 'macOS':
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try:
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import CoreBluetooth # pylint: disable=import-error,unused-import
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except ImportError:
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fatal(
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I18n['please-install-pyobjc-via-pip'],
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' $ pip3 install pyobjc',
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code=ExitCodes.MissingDependency,
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sep='\n'
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)
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# Test if `bleak` is there
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try:
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from bleak import BleakClient, BleakScanner
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from bleak.backends.device import BLEDevice
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from bleak.exc import BleakError, BleakDBusError
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except ImportError:
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fatal(
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I18n['please-install-bleak-via-pip'],
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' $ pip3 install bleak',
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code=ExitCodes.MissingDependency,
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sep='\n'
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)
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# Import essential basic parts
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try:
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from printer_lib.models import Models, Model
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from printer_lib.commander import Commander, reverse_bits
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from printer_lib.text_print import TextCanvas
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except ImportError:
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fatal(
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I18n['folder-printer_lib-is-incomplete-or-missing-please-check'],
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code=ExitCodes.IncompleteProgram
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)
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# Helpers
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def flip(buffer, width, height, horizontally=False, vertically=True, *, overwrite=False):
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'Flip the bitmap data'
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buffer.seek(0)
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if not horizontally and not vertically:
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return buffer
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data_width = width // 8
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result_0 = io.BytesIO()
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if horizontally:
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while data := buffer.read(data_width):
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data = bytearray(map(reverse_bits, data))
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data.reverse()
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result_0.write(data)
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result_0.seek(0)
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else:
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result_0 = buffer
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result_1 = io.BytesIO()
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if vertically:
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for i in range(height - 1, -1, -1):
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result_0.seek(i * data_width)
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data = result_0.read(data_width)
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result_1.write(data)
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result_1.seek(0)
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else:
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result_1 = result_0
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buffer.seek(0)
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if overwrite:
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while data := result_1.read(data_width):
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buffer.write(data)
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buffer.seek(0)
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return result_1
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# Classes
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class PrinterError(Exception):
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'Exception raised when something went wrong during printing'
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message: str
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message_localized: str
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def __init__(self, *args):
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super().__init__(*args)
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self.message = args[0]
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self.message_localized = I18n[args]
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class PrinterData():
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''' The image data to be used by `PrinterDriver`.
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Optionally give an io `file` to read PBM image data from it.
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To read the bitmap data, simply do `io` operation with attribute `data`
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'''
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buffer = 4 * 1024 * 1024
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width: int
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'Constant width'
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_data_width: int
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'Amount of data bytes per line'
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height: int
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'Total height of bitmap data'
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data: bytearray
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'Monochrome bitmap data `io`, of size `width * height // 8`'
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pages: list
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'Height of every page in a `list`'
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max_size: int
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'Max size of `data`'
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full: bool
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'Whether the data is full (i.e. have reached max size)'
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def __init__(self, width, file: io.BufferedIOBase=None, max_size=64 * 1024 * 1024):
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self.width = width
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self._data_width = width // 8
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self.height = 0
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self.max_size = max_size
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self.max_height = max_size // self._data_width
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self.full = False
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self.data = io.BytesIO()
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self.pages = []
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if file is not None:
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self.from_pbm(file)
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def write(self, data: bytearray):
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''' Directly write bitmap data to `data` directly. For memory safety,
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will overwrite earliest data if going to reach `max_size`.
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returns the io position after writing.
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'''
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data_len = len(data)
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if self.data.tell() + data_len > self.max_size:
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self.full = True
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self.data.seek(0)
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self.data.write(data)
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position = self.data.tell()
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if not self.full:
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self.height = position // self._data_width
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return position
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def read(self, length=-1):
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''' Read the bitmap data entirely, in chunks.
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`yield` the resulting data.
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Will finally put seek point to `0`
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'''
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self.data.seek(0)
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while chunk := self.data.read(length):
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yield chunk
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self.data.seek(0)
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def from_pbm(self, file: io.BufferedIOBase):
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''' Read from buffer `file` that have PBM image data.
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Concatenating multiple files *is* allowed.
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Calling multiple times is also possible,
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before or after yielding `read`, not between.
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Will put seek point to last byte written.
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'''
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while signature := file.readline():
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if signature != b'P4\n':
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error('input-is-not-pbm-image', exception=PrinterError)
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while True:
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# There can be comments. Skip them
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line = file.readline()[0:-1]
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if line[0:1] != b'#':
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break
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width, height = map(int, line.split(b' '))
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if width != self.width:
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error(
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'unsuitable-image-width-expected-0-got-1',
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self.width, width,
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exception=PrinterError
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)
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self.pages.append(height)
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self.height += height
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total_size = 0
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expected_size = self._data_width * height
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while raw_data := file.read(
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min(self.buffer, expected_size - total_size)):
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total_size += len(raw_data)
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self.write(raw_data)
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if self.full:
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self.pages.pop(0)
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if total_size != expected_size:
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error('broken-pbm-image', exception=PrinterError)
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if file is not sys.stdin.buffer:
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file.close()
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def to_pbm(self, *, merge_pages=False):
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''' `yield` the pages as PBM image data,
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optionally just merge to one page.
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Will restore the previous seek point.
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'''
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pointer = self.data.tell()
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self.data.seek(0)
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if merge_pages:
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yield bytearray(
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b'P4\n%i %i\n' % (self.width, self.height)
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) + self.data.read()
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else:
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for i in self.pages:
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yield bytearray(
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b'P4\n%i %i\n' % (self.width, i)
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) + self.data.read(self._data_width * i)
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self.data.seek(pointer)
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def __del__(self):
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self.data.truncate(0)
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self.data.close()
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del self.data
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# The driver
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class PrinterDriver(Commander):
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'The core driver of Cat-Printer'
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device: BleakClient = None
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'The connected printer device.'
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model: Model = None
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'The printer model'
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scan_timeout: float = 4.0
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connection_timeout : float = 5.0
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use_text_mode: bool = False
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font_family: str = 'font'
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text_canvas: TextCanvas = None
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flip_h: bool = False
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flip_v: bool = False
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wrap: bool = False
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rtl: bool = False
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mtu: int = 200
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tx_characteristic = '0000ae01-0000-1000-8000-00805f9b34fb'
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rx_characteristic = '0000ae02-0000-1000-8000-00805f9b34fb'
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dry_run: bool = False
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'Test print process only, will not waste paper'
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fake: bool = False
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'Test data logic only, will not waste time'
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dump: bool = False
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'Dump traffic data, and if it\'s text printing, the resulting PBM image'
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_loop: asyncio.AbstractEventLoop = None
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_traffic_dump: io.FileIO = None
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_paused: bool = False
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_pending_data: io.BytesIO = None
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def __init__(self):
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self._loop = asyncio.get_event_loop_policy().get_event_loop()
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def loop(self, *futures):
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''' Run coroutines in order in current event loop until complete,
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return its result directly, or their result as tuple
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'''
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results = []
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for future in futures:
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results.append(self._loop.run_until_complete(future))
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return results[0] if len(results) == 1 else tuple(results)
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def connect(self, name=None, address=None):
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''' Connect to this device, and operate on it
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'''
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self._pending_data = io.BytesIO()
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if self.fake:
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return
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if (self.device is not None and address is not None and
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(self.device.address.lower() == address.lower())):
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return
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try:
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if self.device is not None and self.device.is_connected:
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self.loop(self.device.stop_notify(self.rx_characteristic))
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self.loop(self.device.disconnect())
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except: # pylint: disable=bare-except
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pass
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finally:
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self.device = None
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if name is None and address is None:
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return
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self.model = Models[name]
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self.device = BleakClient(address)
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def notify(_char, data):
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if data == b'\x51\x78\xae\x01\x01\x00\x10\x70\xff':
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self._paused = True
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elif data == b'\x51\x78\xae\x01\x01\x00\x00\x00\xff':
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self._paused = False
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self.loop(
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self.device.connect(timeout=self.connection_timeout),
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self.device.start_notify(self.rx_characteristic, notify)
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)
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def scan(self, identifier: str=None, *, use_result=False):
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''' Scan for supported devices, optionally filter with `identifier`,
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which can be device model (bluetooth name), and optionally MAC address, after a comma.
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If `use_result` is True, connect to the first available device to driver instantly.
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Note: MAC address doesn't work on Apple MacOS. In place with it,
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You need an UUID of BLE device dynamically given by MacOS.
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'''
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if self.fake:
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return
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if identifier:
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if identifier.find(',') != -1:
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name, address = identifier.split(',')
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if name not in Models:
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error('model-0-is-not-supported-yet', name, exception=PrinterError)
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if address[2::3] != ':::::' and len(address.replace('-', '')) != 32:
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error('invalid-address-0', address, exception=PrinterError)
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if use_result:
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self.connect(name, address)
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return [BLEDevice(address, name)]
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elif (identifier not in Models and
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identifier[2::3] != ':::::' and len(identifier.replace('-', '')) != 32):
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error('model-0-is-not-supported-yet', identifier, exception=PrinterError)
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scanner = BleakScanner()
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devices = self.loop(
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scanner.discover(self.scan_timeout)
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)
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devices = [dev for dev in devices if dev.name in Models]
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if identifier is not None:
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if identifier in Models:
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devices = [dev for dev in devices if dev.name == identifier]
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else:
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devices = [dev for dev in devices if dev.address.lower() == identifier.lower()]
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if use_result and len(devices) != 0:
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self.connect(devices[0].name, devices[0].address)
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return devices
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def print(self, file: io.BufferedIOBase, *, mode='default',
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identifier: str=None):
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''' Print data of `file`.
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Currently, available modes are `pbm` and `text`.
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If no devices were connected, scan & connect to one first.
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'''
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self._pending_data = io.BytesIO()
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if self.device is None:
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self.scan(identifier, use_result=True)
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if self.device is None and not self.fake:
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error('no-available-devices-found', exception=PrinterError)
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if mode == 'pbm' or mode == 'default':
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printer_data = PrinterData(self.model.paper_width, file)
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self._print_bitmap(printer_data)
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elif mode == 'text':
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self._print_text(file)
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else:
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... # TODO: other?
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def flush(self):
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'Send pending data instantly, but will block if paused'
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self._pending_data.seek(0)
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while chunk := self._pending_data.read(self.mtu):
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while self._paused:
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self.loop(asyncio.sleep(0.2))
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self.loop(
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self.device.write_gatt_char(self.tx_characteristic, chunk),
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asyncio.sleep(0.02)
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)
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self._pending_data.seek(0)
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self._pending_data.truncate()
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def send(self, data):
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''' Pend `data`, send if enough size is reached.
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You can manually `flush` to send data instantly,
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and should do `flush` at the end of printing.
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'''
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if self.dump:
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if self._traffic_dump is None:
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self._traffic_dump = open('traffic.dump', 'wb')
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self._traffic_dump.write(data)
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if self.fake:
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return
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self._pending_data.write(data)
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if self._pending_data.tell() > self.mtu * 16 and not self._paused:
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self.flush()
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def _print_bitmap(self, data: PrinterData):
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paper_width = self.model.paper_width
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flip(data.data, data.width, data.height, self.flip_h, self.flip_v, overwrite=True)
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if self.model.is_new_kind:
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self.start_printing_new()
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else:
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self.start_printing()
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if self.use_text_mode:
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self.text_mode()
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else:
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self.image_mode()
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# TODO: specify other commands
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self.start_lattice()
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# TODO: consider compression on new devices
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for chunk in data.read(paper_width // 8):
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if self.dry_run:
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chunk = b'\x00' * len(chunk)
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self.draw_bitmap(chunk)
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if self.dump:
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with open('dump.pbm', 'wb') as dump_pbm:
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dump_pbm.write(next(data.to_pbm(merge_pages=True)))
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self.end_lattice()
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# TODO: adjustable
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self.feed_paper(128)
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self.flush()
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def _print_text(self, file: io.BufferedIOBase):
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paper_width = self.model.paper_width
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text_io = io.TextIOWrapper(file, encoding='utf-8')
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if self.text_canvas is None:
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self.text_canvas = TextCanvas(paper_width, wrap=self.wrap,
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rtl=self.rtl, font_path=self.font_family + '.pf2')
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if file is sys.stdin.buffer:
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pf2 = self.text_canvas.pf2
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info(I18n['font-size-0', pf2.point_size])
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width_stats = {}
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for i in range(0x20, 0x7f):
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char = chr(i)
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width_stats[char] = pf2[char].width
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average = pf2.point_size // 2
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if (width_stats[' '] == width_stats['i'] ==
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width_stats['m'] == width_stats['M']):
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average = width_stats['A']
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else:
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average = (width_stats['a'] + width_stats['A'] +
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width_stats['0'] + width_stats['+']) // 4
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info('-------+' * (paper_width // average // 8) +
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'-' * (paper_width // average % 8))
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if self.model.is_new_kind:
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self.start_printing_new()
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else:
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self.start_printing()
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if self.use_text_mode:
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self.text_mode()
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else:
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self.image_mode()
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# TODO: specify other commands
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self.start_lattice()
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printer_data = PrinterData(paper_width)
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buffer = io.BytesIO()
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try:
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while line := text_io.readline():
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if '\x00' in line:
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error('input-is-not-text-file', exception=PrinterError)
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line_count = 0
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for data in self.text_canvas.puttext(line):
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buffer.write(data)
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line_count += 1
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flip(buffer, self.text_canvas.width, self.text_canvas.height * line_count,
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self.flip_h, self.flip_v, overwrite=True)
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while chunk := buffer.read(paper_width // 8):
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printer_data.write(chunk)
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if self.dry_run:
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chunk = b'\x00' * len(chunk)
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self.draw_bitmap(chunk)
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buffer.seek(0)
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buffer.truncate()
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self.flush()
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except UnicodeDecodeError:
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error('input-is-not-text-file', exception=PrinterError)
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if self.dump:
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with open('dump.pbm', 'wb') as dump_pbm:
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dump_pbm.write(next(printer_data.to_pbm(merge_pages=True)))
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self.end_lattice()
|
|
# TODO: adjustable
|
|
self.feed_paper(128)
|
|
self.flush()
|
|
|
|
def unload(self):
|
|
''' Unload this instance, disconnect device and clean up.
|
|
'''
|
|
if self.device is not None:
|
|
info(I18n['disconnecting-from-printer'])
|
|
try:
|
|
self.loop(
|
|
self.device.stop_notify(self.rx_characteristic),
|
|
self.device.disconnect()
|
|
)
|
|
except (BleakError, EOFError):
|
|
self.device = None
|
|
if self._traffic_dump is not None:
|
|
self._traffic_dump.close()
|
|
self._loop.close()
|
|
|
|
# CLI procedure
|
|
|
|
def magick_text(stdin, image_width, font_size, font_family):
|
|
'Pipe an io to ImageMagick for processing text to image, return output io'
|
|
read_fd, write_fd = os.pipe()
|
|
subprocess.Popen(['magick', '-background', 'white', '-fill', 'black',
|
|
'-size', f'{image_width}x', '-font', font_family, '-pointsize', str(font_size),
|
|
'caption:@-', 'pbm:-'],
|
|
stdin=stdin, stdout=io.FileIO(write_fd, 'w'))
|
|
return io.FileIO(read_fd, 'r')
|
|
|
|
def magick_image(stdin, image_width, dither):
|
|
'Pipe an io to ImageMagick for processing "usual" image to pbm, return output io'
|
|
read_fd, write_fd = os.pipe()
|
|
subprocess.Popen(['magick', '-', '-fill', 'white', '-opaque', 'transparent',
|
|
'-resize', f'{image_width}x', '-dither', dither, '-monochrome', 'pbm:-'],
|
|
stdin=stdin, stdout=io.FileIO(write_fd, 'w'))
|
|
return io.FileIO(read_fd, 'r')
|
|
|
|
class HelpFormatterI18n(argparse.HelpFormatter):
|
|
'How dare the author of this thing hardcode strings and a colon?'
|
|
|
|
class _Section(argparse.HelpFormatter._Section): # pylint: disable=protected-access
|
|
'For removing trailing hardcoded colon. Many cultures have their own'
|
|
|
|
def format_help(self):
|
|
lines = super().format_help().split('\n')
|
|
if len(lines) > 1 and lines[1].endswith(':'):
|
|
lines[1] = lines[1][:-1] + '\n'
|
|
return '\n'.join(lines)
|
|
|
|
def _format_usage(self, usage, actions, groups, prefix=None):
|
|
return super()._format_usage(usage, actions, groups, I18n['usage-'])
|
|
|
|
class ArgumentParserI18n(argparse.ArgumentParser):
|
|
'For using our i18n instead of gettext'
|
|
|
|
def __init__(self, *args, **kwargs):
|
|
super().__init__(*args, **kwargs, formatter_class=HelpFormatterI18n, add_help=False)
|
|
del self._positionals
|
|
del self._optionals
|
|
add_group = self.add_argument_group
|
|
self._positionals = add_group(I18n['positional-arguments-'])
|
|
self._optionals = add_group(I18n['options-'])
|
|
|
|
def add_argument(self, *args, **kwargs):
|
|
if 'required' not in kwargs and len(args) > 1 and args[1].startswith('-'):
|
|
kwargs['required'] = False
|
|
super().add_argument(*args, **kwargs)
|
|
|
|
Printer = None
|
|
|
|
def _main():
|
|
'Main routine for direct command line execution'
|
|
parser = ArgumentParserI18n(
|
|
description=' '.join([
|
|
I18n['print-to-cat-printer'],
|
|
I18n['supported-models-'],
|
|
str((*Models, ))
|
|
])
|
|
)
|
|
# TODO: group some switches to dedicated help
|
|
parser.add_argument('-h', '--help', action='store_true',
|
|
help=I18n['show-this-help-message'])
|
|
parser.add_argument('file', default='-', metavar='File', type=str,
|
|
help=I18n['path-to-input-file-dash-for-stdin'])
|
|
parser.add_argument('-s', '--scan', metavar='Time[,XY01[,MacAddress]]', default='3', type=str,
|
|
help=I18n['scan-for-a-printer'])
|
|
parser.add_argument('-c', '--convert', metavar='text|image', type=str, default='',
|
|
help=I18n['convert-input-image-with-imagemagick'])
|
|
parser.add_argument('-p', '--image', metavar='flip|fliph|flipv', type=str, default='',
|
|
help=I18n['image-printing-options'])
|
|
parser.add_argument('-t', '--text', metavar='Size[,FontFamily][,pf2][,nowrap][,rtl]', type=str,
|
|
default='', help=I18n['text-printing-mode-with-options'])
|
|
parser.add_argument('-d', '--dry', action='store_true',
|
|
help=I18n['dry-run-test-print-process-only'])
|
|
parser.add_argument('-f', '--fake', metavar='XY01', type=str, default='',
|
|
help=I18n['virtual-run-on-specified-model'])
|
|
parser.add_argument('-m', '--dump', action='store_true',
|
|
help=I18n['dump-the-traffic'])
|
|
parser.add_argument('-n', '--nothing', action='store_true',
|
|
help=I18n['do-nothing'])
|
|
|
|
if len(sys.argv) < 2 or '-h' in sys.argv or '--help' in sys.argv:
|
|
parser.print_help()
|
|
sys.exit(0)
|
|
|
|
args = parser.parse_args()
|
|
|
|
printer = PrinterDriver()
|
|
|
|
scan_param = args.scan.split(',')
|
|
printer.scan_timeout = float(scan_param[0])
|
|
identifier = ','.join(scan_param[1:])
|
|
|
|
image_param = args.image.split(',')
|
|
if 'flip' in image_param:
|
|
printer.flip_h = True
|
|
printer.flip_v = True
|
|
elif 'fliph' in image_param:
|
|
printer.flip_h = True
|
|
elif 'flipv' in image_param:
|
|
printer.flip_v = True
|
|
|
|
if args.text:
|
|
text_param = args.text.split(',')
|
|
font_size = int(text_param[0]) if len(text_param) > 0 else None
|
|
font_family = text_param[1] if len(text_param) > 1 else None
|
|
printer.wrap = 'nowrap' not in text_param
|
|
printer.rtl = 'rtl' in text_param
|
|
|
|
info(I18n['cat-printer'])
|
|
|
|
if args.dry:
|
|
info(I18n['dry-run-test-print-process-only'])
|
|
printer.dry_run = True
|
|
if args.fake:
|
|
printer.fake = True
|
|
printer.model = Models[args.fake]
|
|
else:
|
|
info(I18n['connecting'])
|
|
printer.scan(identifier, use_result=True)
|
|
printer.dump = args.dump
|
|
|
|
mode = 'pbm'
|
|
|
|
if args.file == '-':
|
|
file = sys.stdin.buffer
|
|
else:
|
|
file = open(args.file, 'rb')
|
|
|
|
if args.text:
|
|
info(I18n['text-printing-mode'])
|
|
printer.use_text_mode = True
|
|
printer.font_family = font_family or 'font'
|
|
if 'pf2' not in text_param:
|
|
# TODO: remove hardcoded width
|
|
file = magick_text(file, 384,
|
|
font_size, font_family)
|
|
else:
|
|
mode = 'text'
|
|
elif args.convert:
|
|
file = magick_image(file, 384, (
|
|
'None'
|
|
if args.convert == 'text'
|
|
else 'FloydSteinberg')
|
|
)
|
|
|
|
if args.nothing:
|
|
global Printer
|
|
Printer = printer
|
|
return
|
|
try:
|
|
printer.print(file, mode=mode)
|
|
info(I18n['finished'])
|
|
except KeyboardInterrupt:
|
|
info(I18n['stopping'])
|
|
finally:
|
|
file.close()
|
|
printer.unload()
|
|
|
|
def main():
|
|
'Run the `_main` routine while catching exceptions'
|
|
try:
|
|
_main()
|
|
except (BleakError, AttributeError) as e:
|
|
error_message = str(e)
|
|
if (
|
|
('not turned on' in error_message) or # windows or android
|
|
(isinstance(e, BleakDBusError) and # linux/dbus/bluetoothctl
|
|
getattr(e, 'dbus_error') == 'org.bluez.Error.NotReady')
|
|
):
|
|
fatal(I18n['please-enable-bluetooth'], code=ExitCodes.GeneralError)
|
|
elif (
|
|
(isinstance(e, AttributeError) and # macos, possibly?
|
|
'CentralManagerDelegate' in error_message)
|
|
):
|
|
fatal(I18n['please-enable-bluetooth-or-try-to-reboot'], code=ExitCodes.GeneralError)
|
|
else:
|
|
raise
|
|
except PrinterError as e:
|
|
fatal(e.message_localized, code=ExitCodes.PrinterError)
|
|
|
|
if __name__ == '__main__':
|
|
main()
|