parse-options: disallow double-negations of options starting with no-

Many options can be negated by prefixing the option with "no-", for
example "--3way" can be prefixed with "--no-3way" to disable it. Since
0f1930c58754 ("parse-options: allow positivation of options
starting, with no-", 2012-02-25) we have also had support to negate
options which start with "no-" by using the positive wording.

This leads to the confusing (and non-documented) case that you can still
prefix options beginning with "no-" by a second "no-" to negate them.
That is, we allow "no-no-hardlinks" to negate the "no-hardlinks" option.

This can be confusing to the user so lets just disallow the
double-negative forms. If the long_name begins with "no-" then we simply
don't allow the regular negation format, and only allow the option to be
negated by the positive form.

Signed-off-by: Jacob Keller <jacob.keller@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

0 files changed, 0 insertions, 0 deletions