So here's my shellconfig.py, presented for comment / inspiration.
A couple notes:
* This is an interesting construct that I wasn't aware of:
def quote(s):
for c in s:
if c not in _safechars:
break
else:
return s
...
Apparently, if you have an 'else:' block after 'for:', it gets executed
if you 'break' out of the loop. Neat!
But _parseline is really the interesting part:
def _parseline(self, line):
s = line.strip()
if '#' in s:
s = s[:s.find('#')] # remove from comment to EOL
s = s.strip() # and any unnecessary whitespace
key, eq, val = s.partition('=')
if self.read_unquote:
val = unquote(val)
if key != '' and eq == '=':
return (key, val)
else:
return (None, None)
* You want to remove the comment before the partition(), otherwise this
line would end up with a weird value:
GRAPHICS="vnc" # other choices: "spice", "none"
* quote() and unquote() use pipes._safechars and shlex.split(),
respectively.
* pipes.quote() doesn't work because it puts single-quotes around '$',
assuming that the given string is a literal filename
* There's no write() method but it's pretty obvious - you'd just open a
file and do f.write(str(config)) or similar.
Hope that's useful to somebody,
-w
"""
Configuration file parser for shell-style config files.
"""
import shlex
from pipes import _safechars
from collections import OrderedDict
def unquote(s):
return ' '.join(shlex.split(s))
def quote(s):
for c in s:
if c not in _safechars:
break
else:
return s
return '"'+s.replace('"', '\\"')+'"'
class ShellConfig(OrderedDict):
def __init__(self, filename=None, read_unquote=True, write_quote=True):
OrderedDict.__init__(self)
self._lines = list()
self.read_unquote = read_unquote
self.write_quote = write_quote
def set(self, key, val):
self[str(key)] = str(val)
# A copy of ConfigParser.read()
def read(self, filenames):
if isinstance(filenames, basestring):
filenames = [filenames]
read_ok = []
for filename in filenames:
try:
fp = open(filename, 'r')
except IOError:
continue
self._read(fp, filename)
fp.close()
read_ok.append(filename)
return read_ok
def _read(self, fp, fpname):
for line in fp:
self._lines.append(line)
key, val = self._parseline(line)
if key:
self[key] = val
def _parseline(self, line):
s = line.strip()
if '#' in s:
s = s[:s.find('#')] # remove from comment to EOL
s = s.strip() # and any unnecessary whitespace
key, eq, val = s.partition('=')
if self.read_unquote:
val = unquote(val)
if key != '' and eq == '=':
return (key, val)
else:
return (None, None)
def __str__(self):
s = ''
for line in self._lines:
key, val = self._parseline(line)
if key is None:
s += line
else:
val = self[key]
if self.write_quote:
val = quote(val)
s += key + '=' + val + "\n"
return s
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