/usr/share/doc/bash/examples/functions/dirstack is in bash-doc 4.4.18-2ubuntu1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 | #!/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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