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From: Bart Schaefer <schaefer@brasslantern.com>
Message-id: <111108071341.ZM3017@torch.brasslantern.com>
Date: Tue, 08 Nov 2011 07:13:41 -0800
In-reply-to: <20111108142146.GC1621@x4.trippels.de>
Comments: In reply to Markus Trippelsdorf <markus@trippelsdorf.de>
 "Re: zsh spinning for ages when I hit tab on directory" (Nov  8,  3:21pm)
References: <20111108131022.GA1621@x4.trippels.de>
	<20111108135809.GB1621@x4.trippels.de>	<20111108142146.GC1621@x4.trippels.de>
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Subject: Re: zsh spinning for ages when I hit tab on directory
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On Nov 8,  3:21pm, Markus Trippelsdorf wrote:
} Subject: Re: zsh spinning for ages when I hit tab on directory
}
} > > When position the cursor after the man1/ of 
} > > ~ % /usr/share/gcc-data/x86_64-pc-linux-gnu/4.7.0/man/man1/
} > > and hit tab, zsh starts spinning:
} 
} zstyle ':completion:::::' completer _complete _approximate
} zstyle -e ':completion:*:approximate:*' max-errors 'reply=( $(( ($#PREFIX+$#SUFFIX)/3 )) )'
} zstyle ':completion:*:corrections' format '%B%d (errors: %e)%b'
} 
} When I comment out the max-errors zstyle, zsh no longer hangs.
} 
} So the next question is, how can I get the same behavior as before, but
} without the long hangs?

You're computing max-errors based on the length of the entire path, but
the effect of correction is applied to each individual component, so
you're allowing 18 corrections per filename in man1/ with the above.

Try changing to something like

zstyle -e ':completion:*:approximate:*' \
	max-errors 'reply=( $(( ($#PREFIX:t+$#SUFFIX:h)/3 )) )'

although that (and your original) allows no corrections unless there
are at least 6 characters already in the current word, so you might
want to use e.g. ($#PREFIX:t+2) or ($#PREFIX:t < 3 ? 3 : $#PREFIX:t).