phabricator: avoid a stacktrace when command arguments are missing Previously, the TypeError wasn't properly converted to a SignatureError when improper arguments were supplied to the inner function, because the stack depth is 2 inside the vcrcommand decorator. The `__name__` and `__doc__` attributes need to be reassigned to the new wrapper so that the help summary is available. Differential Revision: https://phab.mercurial-scm.org/D8209

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# extension to emulate interrupting filemerge._filemerge

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from __future__ import absolute_import

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from mercurial import (

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    error,

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    extensions,

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    filemerge,

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)

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def failfilemerge(

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    filemergefn, premerge, repo, wctx, mynode, orig, fcd, fco, fca, labels=None

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):

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    raise error.Abort("^C")

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    return filemergefn(premerge, repo, mynode, orig, fcd, fco, fca, labels)

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def extsetup(ui):

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    extensions.wrapfunction(filemerge, '_filemerge', failfilemerge)