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aaronmk
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# Program options processing
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import os
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aaronmk
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import util
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aaronmk
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def env_flag(name): return name in os.environ and os.environ[name] != ''
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aaronmk
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def get_env_var(name, default, env_names_ref=None):
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if env_names_ref != None: env_names_ref.append(name)
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return os.getenv(name, default)
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aaronmk
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def get_env_vars(names, prefix=None, env_names_ref=None, on_unset=util.noop):
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aaronmk
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vars_ = {}
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for name in names:
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env_name = name
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if prefix != None: env_name = prefix+'_'+env_name
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if env_names_ref != None: env_names_ref.append(env_name)
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try: vars_[name] = os.environ[env_name]
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except KeyError, e: on_unset(e)
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return vars_
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aaronmk
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def env_usage(env_names, optional=False):
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str_ = 'env'
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for name in env_names:
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str_ += ' '
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if optional: str_ += '['
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str_ += name+'=...'
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if optional: str_ += ']'
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return str_
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