create new file if not found

tsvedit.py

@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 #
-# Copyright 2011 Ville Rantanen
+# Copyright 2014 Ville Rantanen
 #
 # This program is free software: you can redistribute it and/or modify it
 # under the terms of the GNU Lesser General Public License as published
@@ -20,7 +20,7 @@
 
 __author__ = "Ville Rantanen"
 
-__version__ = "0.1"
+__version__ = "0.2"
 
 import sys,os
 import csv
@@ -175,16 +175,15 @@ def setup_options():
     ''' Setup the command line options '''
     
     parser=ArgumentParser()
-    parser.add_argument("-v",action='version', version=__version__)
-    parser.add_argument("--version",action='version', version=__version__)
+    parser.add_argument("-v","--version",action='version', version=__version__)
     parser.add_argument("-b",action="store_false",dest="backup",default=True,
                       help="Do not create a backup file.")
     parser.add_argument("-i",type=str,dest="delimiter",default="\t",
-                      help="Input delimiter for the CSV, default: [tab]")
+                      help="Input delimiter for the TSV, default: [tab]")
     parser.add_argument("-D",action="store_true",dest="debug",default=False,
                       help="Debug mode, i.e. do not delete the SC file.")
-    parser.add_argument("csv",type=str,action="store",
-                      help="CSV file to edit")
+    parser.add_argument("tsv",type=str,action="store",
+                      help="TSV file to edit")
     options=parser.parse_args()
     return options                
  
@@ -208,7 +207,6 @@ def csv_write(screader,fileout):
     for row in table:
         fileout.write('\t'.join(row)+'\n')
 
- 
 if not which('sc'):
     print('You don\'t seem to have "sc" installed!')
     print('sudo apt-get install sc')
@@ -216,14 +214,19 @@ if not which('sc'):
 
 opts=setup_options()
 
-f_bkp=opts.csv+'.bkp'
+f_split=os.path.split(opts.csv)
+f_bkp=os.path.join(f_split[0],'_bkp.'+f_split[1])
 f_sc=opts.csv+'.sc'
 f_sc_tmp=opts.csv+'.sc.tmp'
 
 # copy a backup file
-if opts.backup:
+if opts.backup and os.path.exists(opts.csv):
     shutil.copyfile(opts.csv, f_bkp)
 
+# create new empty file if not exist
+if not os.path.exists(opts.csv):
+    open(opts.csv,'w').close()
+
 # Convert CSV -> SC
 f_sc_w=open(f_sc,'wt')
 f_csv_r=open(opts.csv,'rt')