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|
name: cd-history
description:
Test someone's CD history package (uses arrays)
# Fails on OS/2, since directory names are prepended with drive letter.
category: !os:os2
stdin:
# go to known place before doing anything
cd /
alias cd=_cd
function _cd
{
typeset -i cdlen i
typeset t
if [ $# -eq 0 ]
then
set -- $HOME
fi
if [ "$CDHISTFILE" -a -r "$CDHISTFILE" ] # if directory history exists
then
typeset CDHIST
i=-1
while read -r t # read directory history file
do
CDHIST[i=i+1]=$t
done <$CDHISTFILE
fi
if [ "${CDHIST[0]}" != "$PWD" -a "$PWD" != "" ]
then
_cdins # insert $PWD into cd history
fi
cdlen=${#CDHIST[*]} # number of elements in history
case "$@" in
-) # cd to new dir
if [ "$OLDPWD" = "" ] && ((cdlen>1))
then
'print' ${CDHIST[1]}
'cd' ${CDHIST[1]}
_pwd
else
'cd' $@
_pwd
fi
;;
-l) # print directory list
typeset -R3 num
((i=cdlen))
while (((i=i-1)>=0))
do
num=$i
'print' "$num ${CDHIST[i]}"
done
return
;;
-[0-9]|-[0-9][0-9]) # cd to dir in list
if (((i=${1#-})<cdlen))
then
'print' ${CDHIST[i]}
'cd' ${CDHIST[i]}
_pwd
else
'cd' $@
_pwd
fi
;;
-*) # cd to matched dir in list
t=${1#-}
i=1
while ((i<cdlen))
do
case ${CDHIST[i]} in
*$t*)
'print' ${CDHIST[i]}
'cd' ${CDHIST[i]}
_pwd
break
;;
esac
((i=i+1))
done
if ((i>=cdlen))
then
'cd' $@
_pwd
fi
;;
*) # cd to new dir
'cd' $@
_pwd
;;
esac
_cdins # insert $PWD into cd history
if [ "$CDHISTFILE" ]
then
cdlen=${#CDHIST[*]} # number of elements in history
i=0
while ((i<cdlen))
do
'print' -r ${CDHIST[i]} # update directory history
((i=i+1))
done >$CDHISTFILE
fi
}
function _cdins # insert $PWD into cd history
{ # meant to be called only by _cd
typeset -i i
((i=0))
while ((i<${#CDHIST[*]})) # see if dir is already in list
do
if [ "${CDHIST[$i]}" = "$PWD" ]
then
break
fi
((i=i+1))
done
if ((i>22)) # limit max size of list
then
i=22
fi
while (((i=i-1)>=0)) # bump old dirs in list
do
CDHIST[i+1]=${CDHIST[i]}
done
CDHIST[0]=$PWD # insert new directory in list
}
function _pwd
{
if [ -n "$ECD" ]
then
pwd 1>&6
fi
}
# Start of test
cd /tmp
cd /bin
cd /etc
cd -
cd -2
cd -l
expected-stdout:
/bin
/tmp
3 /
2 /etc
1 /bin
0 /tmp
---
|
