Fabian Boehm 1a11cee559 functions/cd: Optimize check for too many args ...

This ran two `test`s a `count` and one `echo`, which is a bit wasteful.

So instead, for the common case where you pass one argument, this will
run one `set -q`.

This can save off ~160 microseconds for each ordinary `cd`, which
speeds it up by a factor of ~2 (so 1000 runs of cd might take 260ms
instead of 550ms).

Ideally the cd function would just be incorporated into the builtin,
but that's a bigger change.

2023-07-11 18:01:29 +02:00

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