show command help w/ fzf

part-of-.zshrc

h() {
    local tmp_file=/tmp/h
    local cmd=''

    if [ "$#" -eq 0 ]; then
        cmd=$(echo $PATH | tr ':' '\n' | xargs -I {} find {} -maxdepth 1 -type f -executable 2>/dev/nul
l | xargs -n 1 basename | fzf);
    elif [ "$#" -eq 1 ]; then
        cmd=$1
    else
        echo 'Usage: h               shows help for which command choosen via fzf'
        echo '       h <command>     shows help for <command>'
    fi

    $cmd --help 1>$tmp_file 2>/dev/null
    if [ "$?" != 0 ]; then
        echo "No help for $cmd"
    else
        less $tmp_file
    fi
}