#!/bin/sh

# dm 0.9 - Directory Manager

#  (Instructions below the license)

# LICENSE

# Copyright (C) 2007 Lluís Batlle i Rossell

# 

# 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.

#

# Instructions:

# 'dm' will manage a list of id-directory. 'dmcd' will allow the current shell

# to change to the directory given by 'id'.

#

# Examples:

#  $ dm 1 /tmp   # Adds the id '1' for /tmp

#  $ dm 2 .      # Adds the id '2' for the current dir

#  $ dmcd 1      # Goes to /tmp

#  $ dmcd 2      # Goes to what was your current dir

#  $ dm -d 2     # Deletes the entry for '2'.

#  $ dm          # Shows your 'database'

#  1     /tmp

#  $ dm -h       # Shows help, and defines 'dmcd' for sh.

#

# In order to use 'dmcd', you should define the function

# given by "dm -h" in your shell. Put it in your bashrc or

# a file like that.

#

# Your directory database is stored in ~/.dm .

function showdirs

{

    if [ -f ~/.dm ] ; then

        cat ~/.dm | sort

    fi

}

function testdir

{

    if [ -f ~/.dm ] ; then

        grep "^$1	" ~/.dm > /dev/null 2> /dev/null

    else

        return 1

    fi

}

function deldir

{

    # Remove the old def

    if [ -f ~/.dm ] ; then

        sed -i "/^$1\t/d" ~/.dm

    fi

}

function setdir

{

    # Remove the old def

    deldir $1

    NEWDIR=`getpath "$2"`

    # Add new

    echo "$1	$NEWDIR" >> ~/.dm

}

function getdir

{

    if [ -f ~/.dm ] ; then

        grep "^$1	" ~/.dm | sed 's/^[^\t]*\t//'

    else

        return 1

    fi

}

function showhelp

{

    echo "usage: $0 [ -l | -d id | -t id | id | id newdir ]"

    echo 'For sh: function dmcd { dm -t $1 && cd `dm $1`; }'

}

function getpath

{

    OLD=`pwd`

    cd "$1"

    pwd

    cd "$OLD"

}

# dm -t $1 && cd `dm $1`

if [ $# -lt 1 ]; then

    showdirs

elif [ $1 == "-l" ]; then

    showdirs

elif [ $1 == "-h" ]; then

    showhelp

elif [ $1 == "-d" ]; then

    deldir $2

elif [ $1 == "-t" ]; then

    testdir $2

elif [ $# -eq 2  ]; then

    setdir $1 $2

elif [ $# -eq 1  ]; then

    getdir $1

fi