#! /usr/bin/python

#+
# NAME:
#	splat
# PURPOSE:
#	Converts ascii files between Unix and DOS format.
# CALLING SEQUENCE:
#	splat.py file_name
# INPUTS:
#	file_name	name of ascii file or directory name
#			If a directory is specified all files in
#			the directory are converted.
# PROCEDURE:
#	The script will overwrite the input file
# MODIFICATION HISTORY:
#	MAY-2002, Paul Hick (UCSD/CASS)
#	APR-2005, Paul Hick (UCSD/CASS; pphick@ucsd.edu)
#		Removed dependence on 'string' module.
#		Files are now only overwritten if contents changes.
#-

import sys, os
import tiny

args = tiny.args( sys.argv)
cr2nl = tiny.is_there('-cr2nl',sys.argv)

narg = len(args)-1

if narg != 1:
	file = raw_input('File or directory : ')
else:
	file = args[1]

if os.path.isdir(file):
	files = os.listdir(file)

	for i in range( len(files) ):
		files[i] = os.path.join(file,files[i])

else:
	if not os.path.exists(file):
		print 'file does not exist, ',file
		sys.exit()

	files = [file]


for file in files:

	if os.path.isfile(file):

		print file

		old_lines = (open(file, 'r')).read()

		lines = old_lines.split('\n')
		nline = len(lines)

		for n in range(nline):

			line = lines[n]

			if len(line) > 0:
				if line[-1] == '\r':
					line = line[0:-1]

			lines[n] = line

		lines = ('\n').join(lines)

		# Check for isolated carriage returns; remove them if present
		# Not sure yet whether this works on Windows

		if sys.platform != 'win32':
			n = lines.count('\r')
			if n != 0:
				print n, ' isolated CRs'
				if cr2nl:
					join_char = '\n'
				else:
					join_char = ''
				lines = join_char.join( lines.split('\r') )

		if lines != old_lines:			# Overwrite the input file
			(open(file, 'w')).write(lines)

print 'done'