WIP approach of a text based file browser

#!/bin/sh

FBR_DIFS=$IFS
[ -n "$1" ] && DEF_PATH=${1%/}/ || DEF_PATH="$PWD"/
FBR_PATH=$DEF_PATH
[ $((FBR_X=$(stty size | cut -d" " -f2)-3)) -gt 200 ] && FBR_X=200
FBR_Y=$(($(stty size | cut -d" " -f1)-3))
FBR_FG=white
FBR_BG=gray
export NEWT_COLORS="window=,$FBR_BG;title=$FBR_FG,$FBR_BG;border=,$FBR_BG;textbox=,$FBR_BG;button=,black;listbox=,$FBR_BG;actlistbox=$FBR_FG,$FBR_BG"

FBR_GETLIST(){
    FBR_DIR=$(ls -agGph --time-style=+ "$1" | grep '^d' | awk -F' ' '{printf $1" "$2" (D)";$1=$2=$3="";print $0}' | tail -n +2 | sed 's/.$//')"\n"
    FBR_DIR=$FBR_DIR$(ls -agGph --time-style=+ "$1" | grep '^-')
    IFS="/"

    whiptail --title "Select file..." --menu "Current path: $1" $FBR_Y $FBR_X $(($FBR_Y-8)) \
             $(printf "$FBR_DIR" | awk -F ' ' '{if (NF >=4) {i=4; while (i<NF) {printf $i" "; i++}; {printf $i"/" $3"/"}}}') \
             3>&1 1>&2 2>&3 3>&-
    #[ $? -gt 0 ] && echo /
    IFS=$FBR_DIFS
}

FBR_FILEBROWSER(){
    FBR_SEL=$(FBR_GETLIST "$FBR_PATH")
    while [ -n "$FBR_SEL" ] && [ -d "$FBR_PATH/$FBR_SEL" ]; do
        if [ "$FBR_SEL" = .. ]; then
            [ ! "$FBR_PATH" = / ] && FBR_PATH=${FBR_PATH%/*/}/
        else
            FBR_PATH="$FBR_PATH$FBR_SEL"/
        fi
        FBR_SEL=$(FBR_GETLIST "$FBR_PATH")
    done
    if [ -z "$FBR_SEL" ]; then
        echo Abbruch!
    else
        echo Path: $FBR_PATH/$FBR_SEL
    fi
    exit
    IN=$IN_PATH$SEL
    if [ -e "$IN" ]; then
        if [ -d "$IN" ]; then
            IN_PATH=$IN
            FILEBROWSER
        else
            echo "Ausgewählte Datei: "$IN
        fi
    fi
}

FBR_FILEBROWSER