convert anything to UTF-8 for LESSOPEN

lesspipe_utf8.sh

#!/usr/bin/env bash
# convert anything to UTF-8 for LESSOPEN
LESSPIPE=lesspipe.sh
conv_utf8() {
    if [ -x "$(which nkf 2> /dev/null)" ]; then
        nkf -w -Lw "$1"
    elif [ -x "$(which ruby 2> /dev/null)" ]; then
        ruby -r nkf -pe '$_=NKF.nkf "-w -Lw",$_' "$1"
    else
        cat "$1"
    fi
}
if [ $# -eq 0 -o "$1" == "-" ]; then # pipe
    conv_utf8 - 2> /dev/null
else                                 # file
    if [ -x "$(which $LESSPIPE 2> /dev/null)" -a $($LESSPIPE "$1" | head | wc -c) -gt 0 ]; then
         $LESSPIPE "$1" | conv_utf8 - 2> /dev/null
    else
         conv_utf8 "$1" 2> /dev/null
    fi
fi