#This Python code removed newline character at the end of each line in a text
#file and combines the statement in length of string is smaller than the size
#specified by vairable nL.
#------------------------------------------------------------------------------
import sys, os

#------------------------------------------------------------------------------
#Check if user has specified text file on the command line. If not, Sample.txt
#is defined as input file name.

if (len(sys.argv) < 2):
	in_f = 'Sample.txt'
else:
	in_f = str(sys.argv[1])

if (os.path.isfile(in_f) == False):
	print("\nExiting! Input file is: ", in_f, ' \n')
	print("Specified input text file does not exist in current directory.\n")
	sys.exit()
	
out_f = 'TrimmedFile.txt'

fi = open(in_f, mode="r", encoding="utf-8")
txt = fi.readlines()
nL = len(txt)

nW = 80

i = 0
tt = ''

with open(out_f, 'w') as fo:
	for i in range(nL):

		#Check for blank line (start of a new paragraph)
		if (txt[i] == '\n'):
			fo.write(tt)
			fo.write('\n')
			tt = '\n'
	
		#Continue adding lines till a newline found or size < mid chars
		else:
			tt = tt + txt[i].replace('\n', ' ')
	
		#Write line to the file if size exceeds nL and EOF is not reached
		if (len(tt) >= nW and i < nL):
			fo.write(tt)
			fo.write('\n')
			tt = ''

		#Write the concatenated line irrespective of size once EOF file reached
		elif (i == nL-1):
			fo.write(tt)
			fo.write('\n')
		i = i + 1


fi.close
fo.close