#!/bin/bash

# lsdir v0.1 -- list only directories, not other files
#
# Written by Hean Kuan Ong ( mysurface@gmail.com)
# Sept 9, 2007
#
# Copyright (C) 2007 Hean Kuan Ong All rights reserved.
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

SPATH="."
CLI=""

helpme()
{
    echo "lsdir v0.1"
    echo "USAGE: lsdir [OPTION] [PATH]"
    echo ""
    echo "OPTION:"
    echo " -r,      recursively list all the directories, including hidden directories."
    echo " -l,      detail list of directories."
    echo " -s,      list also hidden directories."
    echo " -v,      verbose, display the acture find command line."
    echo " -h,      help, display the usage."
    echo ""
    echo "LIMITATION:"
    echo " 1. lsdir do NOT support options separation well," 
    echo "    the line below may NOT work as expected."
    echo "        lsdir -l -s ~/"
    echo "    Options have to specified together , i.g. lsdir -ls ~/"
    echo ""
    echo " 2. Not like ls, options have to be specified before PATH,"
    echo "    the line below may NOT work as expected."
    echo "        lsdir ~/ -l"
    echo ""
    echo " 3. PATH do NOT support regular expression."
    echo "    the line below do NOT work as expected."
    echo "        lsdir ~/b*"
    echo ""
   exit 2

}

mkspath()
{
    if [ -e $1 ]
    then
        SPATH="$1"
        cmdS2=" ! -wholename '$1'"
    else
        SPATH='.'
        cmdS2=""
    fi
}

optl=0
opts=0
optr=0
optv=0

while  getopts "lsrvh" option
do
    case $option in
        l ) optl=1
        echo $OPTARG
        ;;
        s ) opts=1
        ;;
        r ) optr=1
        ;;
        v ) optv=1
        ;;
        h ) helpme
        ;;
        * ) echo "unknown option $option"
        ;;
    esac
done

# command line detail list
if [ $optl -ne 1 ]
then
    cmdL=" -printf '%f\n' | column"
else #option select
    cmdL=" -printf '%M+%u+%g+%f+%a\n' | column -s'+' -t"
fi

# command line list hidden directory
if [ $opts -ne 1 ]
then
    cmdS="-name '*' ! -name '.*'"
else #option select
    cmdS="-name '*'"
fi

# command line for recursive
if [ $optr -ne 1 ]
then
    cmdR="-maxdepth 1"
    
else #option select
    cmdR=""
    cmdL=""
fi

arg=$1
if [[ ${arg:0:1} != "-" ]]
then
    SPATH="$1"
    cmdS2=" ! -wholename '$1'"
else
    mkspath $2
fi

CLI="find -L $SPATH $cmdR -type d $cmdS $cmdS2 $cmdL"
if [ $optv -ne 0 ]
then
    echo $CLI
    echo
fi

#execute the command line
eval $CLI