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Help with directory switching functions
- X-seq: zsh-users 20980
- From: Dominik Vogt <vogt@xxxxxxxxxxxxxxxxxx>
- To: Zsh Users <zsh-users@xxxxxxx>
- Subject: Help with directory switching functions
- Date: Tue, 24 Nov 2015 11:32:39 +0100
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I'm trying to write a function that alternately switches between
two directories. With "+-" I can repeatedly switch between the
current directory and the last one where I did anything (type any
command except switching directories). There are still a few
rough edges that might be improved.
The function makes use of the chpwd and precmd functions. chpwd
writes down the $HISTCMD of the last command that switched
directories, and precmd uses that information to mark the current
directory as one yuop might want to switch back later. When such
a directory is left, chpwd finally stores its path in a variable
that is then used by "-+".
-- snip --
function _swapdir_chpwd () {
local _PWD_A
local _OLDPWD_A
_CHPWD_N="$[HISTCMD + 1]"
_PWD_A=$(readlink -f "$PWD")
test x"$_PWD_A" = x"$_RECORDED_DIR_A"; then
_RECORDED_DIR="$PWD"
fi
_OLDPWD_A=$(readlink -f "$OLDPWD")
if test "$_IS_CWD_INTERESTING" = 1 -a ! x"$_PWD_A" = x"$_OLDPWD_A"; then
# really leaving an interesting dir -> record it
_RECORDED_DIR="$OLDPWD"
_RECORDED_DIR_A="$_OLDPWD_A"
_IS_CWD_INTERESTING="0"
fi
}
function chpwd () {
_swapdir_chpwd
}
function _swapdir_precmd () {
test ! "$HISTCMD" = "$_CHPWD_N" && _IS_CWD_INTERESTING="1"
}
function precmd () {
_swapdir_precmd
}
function _swapdir () {
_IS_CWD_INTERESTING=1
cd "$_RECORDED_DIR"
_IS_CWD_INTERESTING=1
}
alias -- +-=_swapdir
-- snip --
Problems:
1. Command lines with multiple command cannot be handled properly
because precmd is just called once for the line, not for each
command.
$ cd ~; ls; cd ..
2. Depending on $HISTCMD is a bit hacky. What I'd really want to
do is to look at the command being executed and decide
individually which commands are "interesting" enough to warrant
recording the current directory.
3. I'd prefer a shell builtin instead of "readlink".
Any suggestions for improvement are welcome.
Ciao
Dominik ^_^ ^_^
--
Dominik Vogt
IBM Germany
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