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#!/usr/bin/env python
# vim: expandtab:tabstop=4:shiftwidth=4
''' The purpose of this module is to contain small utility functions.
'''
import re
def normalize_dnsname(name, padding=10):
''' The purpose of this function is to return a dns name with zero padding,
so that it sorts properly (as a human would expect).
Example: name=ex-lrg-node10.prod.rhcloud.com
Returns: ex-lrg-node0000000010.prod.rhcloud.com
Example Usage:
sorted(['a3.example.com', 'a10.example.com', 'a1.example.com'],
key=normalize_dnsname)
Returns: ['a1.example.com', 'a3.example.com', 'a10.example.com']
'''
parts = re.split(r'(\d+)', name)
retval = []
for part in parts:
if re.match(r'^\d+$', part):
retval.append(part.zfill(padding))
else:
retval.append(part)
return ''.join(retval)
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