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#!/bin/bash
# @(#) dirstack
###
# Another implementation of the directory manipulation functions
# published in the Bolsky & Korn book : "The new Korn shell" :
# cd, to change current directory
# d, to display the stack content
# Eric Sanchis (eric.sanchis@iut-rodez.fr), 2012
#
# 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 3 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, see <http://www.gnu.org/licenses/>.
#
###
shopt -s expand_aliases
shopt -s extglob
shopt -s cdable_vars
alias integer='declare -i'
integer MAX=32
integer INDMAX=MAX-1
integer INDTOP=0
unalias cd 2>/dev/null
alias cd=cdir
unset tab
tab[INDTOP]="$(pwd)"
function cdir
{
local -i ind
local dir
dir="${1:-$HOME}"
case "$dir" in
- ) # cd - => equivalent to : cd -1
ind=INDTOP-1
cd_by_number $ind
;;
-+([[:digit:]]) ) # cd -n
ind=$INDTOP-${dir#-}
cd_by_number $ind
;;
*) # cd ~ or cd dir_name
cd_by_name "$dir"
esac
}
function cd_by_number
{
local -i k=$1
local -i j
local dirtmp
if (( k < 0 ))
then
echo Impossible to change directory >&2
return 1
else
dirtmp="${tab[k]}"
j=k+1
while (( j <= INDTOP ))
do
tab[j-1]="${tab[j]}"
j=j+1
done
tab[INDTOP]="$dirtmp"
\cd "${tab[INDTOP]}"
fi
}
function cd_by_name
{
local -i i
local rep
rep=$( \cd "$1" &>/dev/null && pwd)
if [[ -z "$rep" ]]
then
echo cd : "$1" unknown >&2
return 1
fi
i=$INDTOP
while (( i >= 0 ))
do
if [[ "${tab[i]}" == "$rep" ]]
then break
fi
i=i-1
done
if (( i == INDTOP ))
then # cd -0 => we do nothing !
return 0
elif (( i == -1 ))
then # the directory isn't in the stack
if (( INDTOP == INDMAX ))
then # the stack is FULL
# the oldest directory is removed
local -i m
m=1
while (( m <= INDMAX ))
do
tab[m-1]="${tab[m]}"
m=m+1
done
else # the new directory is added to the top of the stack
INDTOP=INDTOP+1
fi
tab[INDTOP]="$rep"
\cd "${tab[INDTOP]}"
return 0
else # the directory is already in the stack
# $i gives its index
cd_by_number $i
fi
}
function d # display the directory stack
{
local -i i
local rep
i=0
while (( $i <= $INDTOP ))
do
rep="${tab[INDTOP-i]#$HOME/}"
case "$rep" in
$HOME) rep="~" ;;
/* ) : ;;
* ) rep="~/$rep"
esac
echo "$i ) $rep"
i=i+1
done
}
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