bash completion: Improve responsiveness of git-log completion
Junio noticed the bash completion has been taking a long time lately. Petr Baudis tracked it down to 72e5e989 ("bash: Add space after unique command name is completed."). Tracing the code showed we spent significant time inside of this loop within __gitcomp, due to the string copying overhead. [28.146109654] _git common over [28.164791148] gitrefs in [28.280302268] gitrefs dir out [28.300939737] gitcomp in [28.308378112] gitcomp pre-case * [28.313407453] gitcomp iter in * [28.701270296] gitcomp iter out [28.713370786] out normal Since __git_refs avoids this string copying by forking and using echo we use the same trick here when we need to finish generating the names for the caller. Signed-off-by: NShawn O. Pearce <spearce@spearce.org> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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