Here's my contribution to the functions available for tracking
directories across sessions.  It includes a chpwd hook function that
maintains a list of recently used directories (in order) in a file, and
the function "cdr" that uses it; then there are a couple of helper
functions.  Configurable completion is provided so you can decide how
you want to complete the directories in the list.  If you define or add
to zsh_directory_name as indicated in the comments you can use ~[1]
etc. to refer to the directories and completion after ~[ will work.
There are numerous styles to configure various aspects, including the
file where the directories are saved, so you can tie this to a
particular session as detected in ~/.zshrc.

See comments at the top of cdr for documentation.

Very roughly, it's like a more configurable pushd with a persistent
stack, and most-recent-first ordering (like pushd used to have until the
mid nineties at which point I had to introduce a function front end).

Note a couple of aspects work best with the latest version of the shell,
not yet released (I've said 4.3.11 but the current top of tree is OK).

I'm posting it here rather than zsh-users in case anyone wants to make
tweaks to it before it goes further.  It's fairly straightforward shell
code.

pws



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