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can_render mechanism for register_output_renderer, closes #770

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Simon Willison 2020-05-27 22:57:05 -07:00
commit 5ab411c733
6 changed files with 108 additions and 18 deletions
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6
datasette/utils/__init__.py
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@ -811,6 +811,10 @@ def call_with_supported_arguments(fn, **kwargs):
call_with = []
for parameter in parameters:
if parameter not in kwargs:
raise TypeError("{} requires parameters {}".format(fn, tuple(parameters)))
raise TypeError(
"{} requires parameters {}, missing: {}".format(
fn, tuple(parameters), set(parameters) - set(kwargs.keys())
)
)
call_with.append(kwargs[parameter])
return fn(*call_with)