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86e31dffa5
allows specifying commands as either strings or list. This enables adding arguments to JupyterHub.proxy_cmd without breaking backward-compatibility.
30 lines
948 B
Python
30 lines
948 B
Python
"""extra traitlets"""
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# Copyright (c) Jupyter Development Team.
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# Distributed under the terms of the Modified BSD License.
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from IPython.utils.traitlets import List, Unicode
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class URLPrefix(Unicode):
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def validate(self, obj, value):
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u = super().validate(obj, value)
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if not u.startswith('/'):
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u = '/' + u
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if not u.endswith('/'):
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u = u + '/'
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return u
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class Command(List):
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"""Traitlet for a command that should be a list of strings,
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but allows it to be specified as a single string.
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"""
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def __init__(self, default_value=None, **kwargs):
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kwargs.setdefault('minlen', 1)
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if isinstance(default_value, str):
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default_value = [default_value]
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super().__init__(Unicode, default_value, **kwargs)
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def validate(self, obj, value):
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if isinstance(value, str):
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value = [value]
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return super().validate(obj, value)
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