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Re: print hash table to disk and reread in hash table


From: Ted Zlatanov
Subject: Re: print hash table to disk and reread in hash table
Date: Fri, 29 Aug 2008 13:10:11 -0500
User-agent: Gnus/5.110011 (No Gnus v0.11) Emacs/23.0.60 (gnu/linux)

On Fri, 29 Aug 2008 17:52:07 +0300 Eli Zaretskii <address@hidden> wrote: 

EZ> You mean, like bindat.el?
>> 
>> That looks useful for binary data.  I don't see from the code how to use
>> it to save and load a hashtable.

EZ> I never used it, I just advertised the closest hit for what you seemed
EZ> to be looking.

>> In addition, this library doesn't manage file I/O.  I'd expect the
>> library do do content coding and error handling internally.  This is,
>> actually, the most tedious part.

EZ> A cause for a small project, I guess. ;-)

I can just copy the code out of gnus-registry.el and abstract the
functionality to do a first cut of such a library.  For a large
hashtable, though, converting to a list on the way in and out is
inefficient compared to storing it in a more "native" format.  Is there
such a format, comparable to the native list read-eval format, as seen
in gnus-load:

  (with-temp-buffer
    (insert-file-contents file)
    (while (not (eobp))
      (condition-case type
          (let ((form (read (current-buffer))))
            (eval form))
;; ... much code omitted ...

cc to emacs-devel as I think this is of interest to that list.

Thanks
Ted


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