36 lines
1.2 KiB
Python
36 lines
1.2 KiB
Python
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import functools
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def _lazy_evaluable(func):
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"""
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Decorator which makes a function lazy-evaluable: that is, when it's
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initially called, it returns a zero-argument lambda with the arguments
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initially passed wrapped up in it. Calling that lambda has the effect
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of executing the function.
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We use this in TZK to allow the user to use function calls in her config
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to define the build steps, while not requiring her to write a bunch of
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ugly and confusing lambda:'s in the config. The functions that will be called
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are prepared during the config and executed later.
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"""
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@functools.wraps(func)
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def new_func(*args, **kwargs):
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my_args = args
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my_kwargs = kwargs
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@functools.wraps(new_func)
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def inner():
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func(*my_args, **my_kwargs)
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return inner
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return new_func
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# Now a more descriptive name that doesn't expose inner workings
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# if the user wants to write her own builder.
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tzk_builder = _lazy_evaluable
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@tzk_builder
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def printer(username: str):
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if username == 'Maud':
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raise Exception("No Mauds allowed!")
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print(f"Hallelujah, {username} built a wiki!")
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printer.name = "Display the user's name"
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