rc/sh/busiest

#!/usr/bin/env zsh
# compat: -ash -bash -dash +zsh

busiest() { ### @-
    ### list directories in descending order by the number of files in them,
    ### counted recursively.
    ###
    ### ```
    ### $ cd && busiest | head -n3
    ### 144181 src
    ### 48840 work
    ### 21042 play
    ### ```
    [ $# -le 0 ] || { printf "%s\n" "$0: too many arguments" >&2; return 1; }
    local c= d=
    for d in *(FDN); do
        print $(find $d 2>/dev/null | wc -l) $d
    done | sort -nr | while read c d; do
        echo -E $c $d
    done
    [ -z $d ] && return 1
}

[ -n "${preload+-}" ] || busiest "$@"