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#!/usr/local/bin/python
#
# lineterm.py
#
# <This one may actually be cross-platform!!!>
#
# Usage: python lineterm.py [options] files
#
# Options:
# -h, --help : Show this message
# -m, --mac : Convert file(s) to Mac format (carriage returns)
# -p, --pc : Convert file(s) to PC format (carriage return/linefeeds)
# -u, --unix : Convert file(s) to Unix format (linefeeds)
# -v, --verbose : Show the number of CRs, LFs, and CR/LFs for the file(s)
#
# Arguments:
# files : any file or group of files (wildcards allowed)
#
# Note:
# Does not currently recurse directories or distinguish between
# binary and ASCII file types. Creates a ~temp file in the current
# directory when converting files to a different format.
#

import os, getopt, sys, curses

def main():
convertToMac = 0
convertToPC = 0
convertToUNIX = 0
isVerbose = 0

try:
opts, args = getopt.getopt( sys.argv[1:], "hmpuv:", ["help", "mac", "pc", "unix", "verbose"] )

except getopt.GetoptError:
# print help information and exit:
usage()
sys.exit( 2 )

for o, a in opts:
if o in ("-h", "--help"):
usage()
sys.exit()
if o in ("-m", "--mac"):
# print "output reached"
# output = a
convertToMac = 1
if o in ("-p", "--pc"):
convertToPC = 1
if o in ("-u", "--unix"):
convertToUNIX = 1
if o in ("-v", "--verbose"):
isVerbose = 1

if len(args) == 0:
usage()
sys.exit()

for FILE in args:
fileType = readFile( FILE, isVerbose )
if fileType != "Undefined":
if convertToMac == 1:
toMac( FILE, fileType )
if convertToPC == 1:
toPC( FILE, fileType )
if convertToUNIX == 1:
toUNIX( FILE, fileType )
else:
print "file "
print FILE
print " is undefined, therefore conversion was aborted"

def toMac( fileName, fileType ):
FILE = open( fileName, "r" )

os.system( "touch ~temp" )
OUTFILE = open( "~temp", "w" )

char = FILE.read( 1 )
last = 0

while char:
if fileType == "UNIX":
if char == chr(0x0a): # LINE FEED
OUTFILE.write( chr(0x0d) ) # replace LF with CR
else:
OUTFILE.write( char )
elif fileType == "MAC":
OUTFILE.write( char ) # file already in mac format
elif fileType == "PC":
if last == chr(0x0a): # if last character was CR
if char == chr(0x0d): # ...and this one is LF
OUTFILE.write( chr(0x0d) ) # then replace CR/LF with CR
last = 0
else:
OUTFILE.write( char )
elif char == chr(0x0a):
last = chr(0x0a)
else:
OUTFILE.write( char )
char = FILE.read( 1 )


FILE.close()
OUTFILE.close()
os.system( "mv ~temp " + fileName + ".MAC" )

print "MAC"


def toPC( fileName, fileType ):
FILE = open( fileName, "r" )

os.system( "touch ~temp" )
OUTFILE = open( "~temp", "w" )

char = FILE.read( 1 )

while char:
if fileType == "UNIX":
if char == chr(0x0a): # LF
OUTFILE.write( chr(0x0d) ) # replace LF with CR/LF
OUTFILE.write( chr(0x0a) )
else:
OUTFILE.write( char )
elif fileType == "MAC":
if char == chr(0x0d):
OUTFILE.write( chr(0x0d) ) # replace CR with CR/LF
OUTFILE.write( chr(0x0a) )
else:
OUTFILE.write( char )
elif fileType == "PC":
OUTFILE.write( char ) # file already in PC format
char = FILE.read( 1 )

FILE.close()
OUTFILE.close()
os.system( "mv ~temp " + fileName + ".PC" )

print "PC"

def toUNIX( fileName, fileType ):
FILE = open( fileName, "r" )

os.system( "touch ~temp" )
OUTFILE = open( "~temp", "w" )

char = FILE.read( 1 )
last = 0

while char:
if fileType == "UNIX":
OUTFILE.write( char ) # file already in UNIX format
elif fileType == "MAC":
if char == chr(0x0d):
OUTFILE.write( chr(0x0a) )
else:
OUTFILE.write( char )
elif fileType == "PC":
if last == chr(0x0d): # if last character was CR
if char == chr(0x0a): # ...and this one is LF
OUTFILE.write( chr(0x0a) ) # then replace CR/LF with LF
last = 0
else:
OUTFILE.write( char )
elif char == chr(0x0d):
last = chr(0x0d)
else:
OUTFILE.write( char )
char = FILE.read( 1 )

FILE.close()
OUTFILE.close()
os.system( "mv ~temp " + fileName + ".UNIX" )

print "UNIX"


def readFile( fileName, isVerbose ):
numCR = 0
numLF = 0
numCRLF = 0

FILE = open( fileName, "r" )

char = FILE.read( 1 )
last = 0

while char:
if char == chr(0x0a): # LINE FEED
numLF = numLF + 1
if last == chr(0x0d): # CR/LF
numCRLF = numCRLF + 1
elif char == chr(0x0d): # CARRIAGE RETURN
numCR = numCR + 1
else:
pass

last = char
char = FILE.read( 1 )

FILE.close()

fileType = "Undefined"

if numCRLF > 0:
print fileName, ": PC Format (CR/LF)"
fileType = "PC"
elif numCR > 0:
if numLF == 0:
print fileName, ": MAC Format (CR only)"
fileType = "MAC"
elif numCR > numLF:
print fileName, ": mix of CR and LF... probably MAC Format"
elif numCR == numLF:
print fileName, ": mix of CR and LF... undetermined format"
else:
print fileName, ": mix of CR and LF... probably UNIX Format"
elif numLF > 0:
print fileName, ": UNIX Format (LF only)"
fileType = "UNIX"
else:
print fileName, ": This file had no terminators"

if isVerbose:
print "CR: ", numCR
print "LF: ", numLF
print "CRLF: ", numCRLF

return fileType

def usage():
print '''\
Usage: python lineterm.py [options] files

Options:
-h, --help : Show this message
-m, --mac : Convert file(s) to Mac format (carriage returns)
-p, --pc : Convert file(s) to PC format (carriage return/linefeeds)
-u, --unix : Convert file(s) to Unix format (linefeeds)
-v, --verbose : Show the number of CRs, LFs, and CR/LFs for the file(s)

Arguments:
files : any file or group of files (wildcards allowed)

Note:
Does not currently recurse directories or distinguish between
binary and ASCII file types. Creates a ~temp file in current
directory when converting files.
'''

if __name__ == "__main__":
main()
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