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"""Utilities for managing configuration files"""
import os

QPID_ENV_PREFIX="QPID_"

def parse_qpidd_conf(config_file):
    """Parse a qpidd.conf configuration file into a dictionary"""
    f =  open(config_file)
    try:
        clean = filter(None, [line.split("#")[0].strip() for line in f]) # Strip comments and blanks
        def item(line): return [x.strip() for x in line.split("=")]
        config = dict(item(line) for line in clean if "=" in line)
    finally: f.close()
    def name(env_name): return env_name[len(QPID_ENV_PREFIX):].lower()
    env = dict((name(i[0]), i[1]) for i in os.environ.iteritems() if i[0].startswith(QPID_ENV_PREFIX))
    config.update(env)          # Environment takes precedence
    return config