cross-reader/printer.py

#!/usr/bin/env python3

import readings
from pprint import pprint
import re, sys, glob
from escpos import escpos
from sys import stdin, stderr, stdout
from time import sleep

import nltk
from nltk.tokenize import RegexpTokenizer
tokenizer = RegexpTokenizer(r'\w+') # initialize tokenizer

connected = True

def check_printer_path():
	printers = glob.glob('/dev/usb/lp*')
	if printers:
		return printers[0]
	else:
		return None

def char_swap(some_string):
	swaps = [('–','-'), ('“','"'),('”','"'),('ù','u'), ("’","'"), ('à','a'), ('â','a'),('é','e'),('è','e'),('î','i')]
	for swap in swaps:
		some_string = some_string.replace(swap[0], swap[1])
	return some_string

def insert_linebreaks(string, linelength):
	count = 0
	tmp = ''
	new = ''
	for x, ch in enumerate(string):
		tmp_ch = []
		if ch == ' ':
			count = count + 1
			if count < linelength:
				tmp += ' '
			else:
				new += tmp + '\n'
				tmp = ''
				count = 0
		elif x+1 == len(string):
			new += tmp + ch
		else:
			tmp += ch
			count += 1
	return new

def printNow(query, results):
	if connected == True:
		printerpath = check_printer_path()
		try:
			print_pointer = open(printerpath, 'w') if printerpath else sys.__stdout__
			print(escpos['reset'], file=print_pointer, flush=True)
			print(escpos['init_printer'], file=print_pointer, flush=True)
			print(escpos['margin_left'], file=print_pointer, flush=True)
			print(escpos['justify_center'], file=print_pointer, flush=True)

			printed = False
			results_count = 0
			for x, document in results.items():
				for n, sentence in enumerate(document['matches']):
					if results_count <= 4:
						results_count += 1
						sentence = str(sentence) # Turn Flask Markup object back to normal python string
						sentence = char_swap(sentence)
						query = char_swap(query)
						sentence = sentence.replace('\n', ' ').replace(' ', ' ')
						pattern = r'[\s\W\_]'+query+r'[\s\W\_\n]|^'+query+'|'+query+'$'
						match = re.search(pattern, sentence, flags=re.IGNORECASE)
						if match: 
							match = match.group()
						sentence_splitted = re.compile(match).split(sentence) # find the query in the sentence, and split the sentence up
						for i, part in enumerate(sentence_splitted):
							if n == 0: # first sentence of this document
								if i == 0: # start of a new sentence
									print('', file=print_pointer, flush=True)
									linebreak = '''    **   
 ** /**  ** 
 //** /** ** 
 **************
///**//**//**/ 
 ** /** //** 
 //  /** // 
	 //    '''
									print(linebreak, file=print_pointer, flush=True) # print line break ascii art
									print('\n', file=print_pointer, flush=True)
									title = insert_linebreaks(document['name'], 13)
									print(escpos['largefont'], title, escpos['normalfont'], file=print_pointer, flush=True) # print the document name
									print('\n', file=print_pointer, flush=True)

							# start of sentence
							part = insert_linebreaks(part, 35)
							print(part, file=print_pointer, flush=True) # print current part of sentence

							if i + 1 != len(sentence_splitted): # if this part is not the last one
								print(escpos['bold'], match, escpos['reset'], file=print_pointer, flush=True) # print query

							# line breaker after each sentence 
							if i + 1 == len(sentence_splitted):
								print('\n | \n', file=print_pointer, flush=True)
								sleep(3)

			end_line = insert_linebreaks('These are the first {} results that the algorithm selected.'.format(results_count), 35)
			print("\n***\n{}\n***".format(end_line), file=print_pointer, flush=True)
			print(escpos['paperfeed_1l'], file=print_pointer, flush=True)
			print(escpos['paperfeed_1l'], file=print_pointer, flush=True)
			print(escpos['paperfeed_1l'], file=print_pointer, flush=True)
			sleep(3)
			print(escpos['papercut'], file=print_pointer, flush=True)
			print(escpos['reset'], file=print_pointer, flush=True)


		except:
			e = sys.exc_info()[0]
			print("Could not print: {}".format(e))

if __name__ == '__main__':
	query = 'noise'
	results, _, _ = readings.request_results(query)
	printNow(query, results)