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#
# Directory manipulation functions from the book 'The Korn Shell'
# Modified for use with bash Mon Apr 18 08:37 1994 by
# Ken Konecki (kenk@wfg.com)
#
# Modified by Chet Ramey
#
# This could stand to have calls to `select' added back in
#
alias integer="declare -i"
integer _push_max=${CDSTACK-31} _push_top=${CDSTACK-31}
unalias cd
# alias cd=_cd
# Display directory stack -- $HOME display as ~
dirs()
{
dir="${PWD#$HOME/}"
case $dir in
$HOME) dir=\~ ;;
/*) ;;
*) dir=\~/$dir ;;
esac
integer i=_push_top
integer n=1
echo "$n) $dir"
while let "i < $_push_max"
do
n=n+1
eval "echo \$n\) \$_push_stack_$i"
i=i+1
done
}
# Change directory and put directory on front of stack
cd()
{
typeset dir=
integer n=0 type=4 i
case $1 in
-|-1|2) # cd -
n=_push_top type=1
;;
-[1-9]|-[1-9][0-9]) # cd -n
n=_push_top+${1#-}-1 type=2
;;
1) # keep present directory
echo "$PWD"
return
;;
[2-9]|[1-9][0-9]) # cd n
n=_push_top+${1}-2 type=2
;;
*)
if let "_push_top <= 0"; then
type=3 n=_push_max
fi
;;
esac
if let "type < 3"; then
if let "n >= _push_max"; then
echo cd: Directory stack not that deep
return 1
else
eval dir=\${_push_stack_$n}
fi
fi
case $dir in
~*) dir=$HOME${dir#\~} ;;
esac
cd2 ${dir:-$@} > /dev/null || return 1
dir=${OLDPWD#$HOME/}
case $dir in
$HOME) dir=\~ ;;
/*) ;;
*) dir=\~/$dir ;;
esac
case $type in
1) # swap first two elements
eval _push_stack_$_push_top=\$dir ;;
2|3) # put $dir on top and shift down by one until top
i=_push_top
unset _dirlist
while let "i < $_push_max" ; do
eval _dirlist=\"\$_dirlist \$_push_stack_$i\"
i=i+1
done
i=_push_top
for dir in "$dir" ${_dirlist} ; do
let "i > n" && break
eval _push_stack_$i=\$dir
i=i+1
done
;;
4) # push name
_push_top=_push_top-1;
eval _push_stack_$_push_top=\$dir
;;
esac
echo "$PWD"
}
# Menu-driven change directory command
function mcd
{
dirs
echo -n "Select by number or enter a name: "
read
cd $REPLY
}
# Emulate ksh cd substitution
cd2()
{
case "$#" in
0) builtin cd "$HOME" ;;
1) builtin cd "$1" ;;
2) newDir=$(echo $PWD | sed -e "s:$1:$2:g")
case "$newDir" in
$PWD) echo "bash:: cd: bad substitution" >&2 ; return 1 ;;
*) builtin cd "$newDir" ;;
esac ;;
*) echo "bash: cd: wrong arg count" 1>&2 ; return 1 ;;
esac
}
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