bash he;lp

I want to make a command that will cd then ls if the dir contents will fit in one terminal line and if not will display number of items in dir how do I do that.

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Subject: BASH custom prompt
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I've been hacking around with the BASH custom prompt and I made myself a prompt that shows the current command number, but there's a problem: I want the number to always be four-digit, so that
[0004][haxus:~] and
[1209][haxus:~] align nicely.