#!/usr/bin/python
# backup_partition.py
# Daniel Dalton <d.dalton@iinet.net.au>
import sys
global version
version = "backup_partition 0.3 Rev 3 (http://members.iinet.net.au/~ddalton/projects/python/backup_partition/)"
def count_argvs(argvs):
"""Returns the number of arguments supplied to the script.
Note: that the counting starts at 1 and the filename is also
included.
So if you do
mypy.py
it will return one, but mypy.py -j will return 2 etc.
"""
count = 0
for i in argvs:
count =count+1
return count
def cmdoptions():
""" Checks how many argvs there are using the help of the function
count_argvs().
Then it looks at each argument and does a certain action depending on the
argument.
Uses a loop to do this, see below for details."""
if count_argvs(sys.argv) == 1: # No arguments supplied
print "Please supply some arguments"
print "Usage: -b <partition> -v version -h help."
sys.exit() #Tell the user a descriptive error and exit
i = count_argvs(sys.argv) #Assign number of arguments to i
# Following loop checks each arg (stops when it runs out of argvs,
# by looking at i and
#Choosing an action in the if block.
#Remember i has the number of argvs returned from count_argvs()
for i in sys.argv:
if i == "-h": #print help
print (usage())
sys.exit()
elif i == "-v": #print version info
print version
sys.exit()
def usage():
"""Prints the command line arguments available.
One of the main documentation functions available. Accessed with -h
and maybe from other places."""
#Assign a long string to the variable help return the variable help
#and then the function calling us can do whatever it likes with it.
help = """ Still needs a bit of work...
Perhaps docstrings should be used, but not up to documentation
yet... """
return help
cmdoptions() #Call the main function to choose an action for each
#argument supplied, also tells user about errors