git-completion.bash: introduce __gitcomp_builtin
This is a __gitcomp wrapper that will execute git ... --git-completion-helper to get the list of completable options. The call will be made only once and cached to avoid performance issues, especially on Windows. __gitcomp_builtin() allows callers to change its output a bit by adding some more options, or removing some. - Current --git-completion-helper for example does not output --no-foo form, this has to be added manually by __gitcomp_builtin() callers when necessary - Some options from --git-completion-helper should only be available in certain conditions (e.g. --continue and friends). __gitcomp_builtin() callers can remove them if the conditions are not met. Signed-off-by: NNguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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