Homepage: http://github.com/rolandwalker/persistent-soft
Author: Roland Walker
Updated:
Persistent storage, returning nil on failure
Quickstart
(require 'persistent-soft)
(persistent-soft-store 'hundred 100 "mydatastore")
(persistent-soft-fetch 'hundred "mydatastore") ; 100
(persistent-soft-fetch 'thousand "mydatastore") ; nil
quit and restart Emacs
(persistent-soft-fetch 'hundred "mydatastore") ; 100
Explanation
This is a wrapper around pcache.el, providing "soft" fetch and
store routines which never throw an error, but instead return
nil on failure.
There is no end-user interface for this library. It is only
useful from other Lisp code.
The following functions are provided:
`persistent-soft-store'
`persistent-soft-fetch'
`persistent-soft-exists-p'
`persistent-soft-flush'
`persistent-soft-location-readable'
`persistent-soft-location-destroy'
To use persistent-soft, place the persistent-soft.el library
somewhere Emacs can find it, and add the following to your
~/.emacs file:
(require 'persistent-soft)
See Also
M-x customize-group RET persistent-soft RET
Notes
Using pcache with a more recent version of CEDET gives
Unsafe call to `eieio-persistent-read'.
eieio-persistent-read: Wrong type argument: class-p, nil
This library provides something of a workaround.
Compatibility and Requirements
GNU Emacs version 24.4-devel : yes, at the time of writing
GNU Emacs version 24.3 : yes
GNU Emacs version 23.3 : yes
GNU Emacs version 22.3 and lower : no
Uses if present: pcache.el (all operations are noops when
not present)
Bugs
Persistent-soft is a wrapper around pcache which is a wrapper
around eieio. Therefore, persistent-soft should probably be
rewritten to use eieio directly or recast as a patch to pcache.
TODO
Setting print-quoted doesn't seem to influence EIEIO.
It doesn't seem right that the sanitization stuff
is needed.
Detect terminal type as returned by (selected-terminal)
as unserializable.
Correctly reconstitute cyclic list structures instead of
breaking them.
Notice and delete old data files.
License
Simplified BSD License:
Redistribution and use in source and binary forms, with or
without modification, are permitted provided that the following
conditions are met:
1. Redistributions of source code must retain the above
copyright notice, this list of conditions and the following
disclaimer.
2. Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following
disclaimer in the documentation and/or other materials
provided with the distribution.
This software is provided by Roland Walker "AS IS" and any express
or implied warranties, including, but not limited to, the implied
warranties of merchantability and fitness for a particular
purpose are disclaimed. In no event shall Roland Walker or
contributors be liable for any direct, indirect, incidental,
special, exemplary, or consequential damages (including, but not
limited to, procurement of substitute goods or services; loss of
use, data, or profits; or business interruption) however caused
and on any theory of liability, whether in contract, strict
liability, or tort (including negligence or otherwise) arising in
any way out of the use of this software, even if advised of the
possibility of such damage.
The views and conclusions contained in the software and
documentation are those of the authors and should not be
interpreted as representing official policies, either expressed
or implied, of Roland Walker.