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|
### cdhist.sh
###
### Copyright (c) 2001 Yusuke Shinyama <yusuke at cs . nyu . edu>
###
### Permission to use, copy, modify, distribute this software and
### its documentation for any purpose is hereby granted, provided
### that existing copyright notices are retained in all copies and
### that this notice is included verbatim in any distributions.
### This software is provided ``AS IS'' without any express or implied
### warranty.
###
### WARNING: THIS SCRIPT IS FOR GNU BASH ONLY!
### What is this?
###
### Cdhist adds 'web-browser like history' to your bash shell.
### Every time you change the current directory it records the directory
### you can go back by simply typing a short command such as '-' or '+',
### just like clicking web-browsers's 'back' button.
### It's more convenient than using directory stacks when
### you walk around two or three directories.
###
### Usage
###
### Just call this file from your .bashrc script.
### The following commands are added.
###
### cd [pathname]
### Go to the given directory, or your home directory if
### pathname is omitted. This overrides the original command.
### You can use it by typing '\cd'.
###
### + [n]
### 'Forward' button. Go to the n'th posterior directory in the history.
### Go to the next directory if the number is omitted.
###
### - [n]
### 'Back' button. Go to the n'th prior directory in the history.
### Go to the previous directory if the number is omitted.
###
### = [n]
### Show histories with directory numbers.
###
### A directory number shows the index to the current directory
### in the history. The current directory always has directory number 0.
### For prior directories, a negative number is given.
### For posterior directories, a positive number is given.
###
### cdhist_reset
### Clear the cd history.
###
### Example
###
### /home/yusuke:$ . cdhist.sh
### /home/yusuke:$ cd /tmp
### /tmp:$ cd /usr/bin
### /usr/bin:$ cd /etc
### /etc:$ -
### /usr/bin:$ -
### /tmp:$ +
### /usr/bin:$ =
### -2 ~
### -1 /tmp
### 0:/usr/bin
### 1 /etc
### /usr/bin:$ - 2
### /home/yusuke:$
###
CDHIST_CDQMAX=10
declare -a CDHIST_CDQ
function cdhist_reset {
CDHIST_CDQ=("$PWD")
}
function cdhist_disp {
echo "$*" | sed "s $HOME ~ g"
}
function cdhist_add {
CDHIST_CDQ=("$1" "${CDHIST_CDQ[@]}")
}
function cdhist_del {
[[ -n $ZSH_VERSION ]] && setopt localoptions && setopt ksharrays
local i=${1-0}
if [ ${#CDHIST_CDQ[@]} -le 1 ]; then return; fi
for ((; i<${#CDHIST_CDQ[@]}-1; i++)); do
CDHIST_CDQ[$i]="${CDHIST_CDQ[$((i+1))]}"
done
unset CDHIST_CDQ[$i]
}
function cdhist_rot {
[[ -n $ZSH_VERSION ]] && setopt localoptions && setopt ksharrays
local i q
declare -a q
for ((i=0; i<$1; i++)); do
q[$i]="${CDHIST_CDQ[$(((i+$1+$2)%$1))]}"
done
for ((i=0; i<$1; i++)); do
CDHIST_CDQ[$i]="${q[$i]}"
done
}
function cdhist_cd {
[[ -n $ZSH_VERSION ]] && setopt localoptions && setopt ksharrays
local i f=0
builtin cd "$@" || return 1
for ((i=0; i<${#CDHIST_CDQ[@]}; i++)); do
if [ "${CDHIST_CDQ[$i]}" = "$PWD" ]; then f=1; break; fi
done
if [ $f -eq 1 ]; then
cdhist_rot $((i+1)) -1
elif [ ${#CDHIST_CDQ[@]} -lt $CDHIST_CDQMAX ]; then
cdhist_add "$PWD"
else
cdhist_rot ${#CDHIST_CDQ[@]} -1
CDHIST_CDQ[0]="$PWD"
fi
}
function cdhist_history {
[[ -n $ZSH_VERSION ]] && setopt localoptions && setopt ksharrays
local i d
if [ $# -eq 0 ]; then
for ((i=${#CDHIST_CDQ[@]}-1; 0<=i; i--)); do
cdhist_disp " $i ${CDHIST_CDQ[$i]}"
done
elif [ "$1" -lt ${#CDHIST_CDQ[@]} ]; then
d=${CDHIST_CDQ[$1]}
if builtin cd "$d"; then
cdhist_rot $(($1+1)) -1
else
cdhist_del $1
fi
cdhist_disp "${CDHIST_CDQ[@]}"
fi
}
function cdhist_forward {
[[ -n $ZSH_VERSION ]] && setopt localoptions && setopt ksharrays
cdhist_rot ${#CDHIST_CDQ[@]} -${1-1}
if ! builtin cd "${CDHIST_CDQ[0]}"; then
cdhist_del 0
fi
cdhist_disp "${CDHIST_CDQ[@]}"
}
function cdhist_back {
[[ -n $ZSH_VERSION ]] && setopt localoptions && setopt ksharrays
cdhist_rot ${#CDHIST_CDQ[@]} ${1-1}
if ! builtin cd "${CDHIST_CDQ[0]}"; then
cdhist_del 0
fi
cdhist_disp "${CDHIST_CDQ[@]}"
}
if [ ${#CDHIST_CDQ[@]} = 0 ]; then cdhist_reset; fi
### Aliases
###
function cd { cdhist_cd "$@"; }
function + { cdhist_forward "$@"; }
function - { cdhist_back "$@"; }
function = { cdhist_history "$@"; }
|
