parse a profile

[MRAB]

On 18/02/2012 16:34, Jason Friedman wrote:
> I have a file I use for shell scripts that looks like this:
>
> export VAR1=/path/to/dir
> export VAR2=7
> export VAR3=${VAR1}/further/path
> # comment
> . /another/file
>
> And a file /another/file:
> export VAR4=database-name
>
> Is there an existing package that will read such a file and return a
> dictionary like this:
> {
>      'VAR1': '/path/to/dir',
>      'VAR2': 7,
>      'VAR3': '/path/to/dir/further/path',
>      'VAR4': 'database-name',
> }

I would probably do something like this:

import re

# Parse the file into a dict.
with open(path) as f:
     d = dict(re.findall(r"(?m)^export (VAR\d+)=(.*)", f.read()))

# Expand any references.
for key, value in d.items():
     d[key] = re.sub(r"\$\{(VAR\d+)\}", lambda m: d[m.group(1)], value)