buffer-local-value confusion

buffer-local-value confusion

[Eric Abrahamsen]

I have defined a buffer-local variable like this:

(defvar nngnorb-attachment-file-list nil)
(make-variable-buffer-local 'nngnorb-attachment-file-list)

I'm first setting a value for it in the buffer referred to by
nnir-tmp-buffer, then trying to copy that buffer-local value to a
different buffer. Here's what I'm seeing, which confuses me:

(with-current-buffer (get-buffer nnir-tmp-buffer)
  nngnorb-attachment-file-list) --> proper, populated value

(buffer-local-value
 nngnorb-attachment-file-list
 (get-buffer nnir-tmp-buffer)) --> nil

I thought this was the whole point of buffer-local-value? Am I doing it
wrong?

On the other hand, using with-current-buffer is almost precisely the
same number of characters as buffer-local-value, so maybe there's no
point in insisting on the latter...

Eric

Re: buffer-local-value confusion

[Marco Wahl]

Eric Abrahamsen <eric@ericabrahamsen.net> writes:

> (defvar nngnorb-attachment-file-list nil)
> (make-variable-buffer-local 'nngnorb-attachment-file-list)
>
> I'm first setting a value for it in the buffer referred to by
> nnir-tmp-buffer, then trying to copy that buffer-local value to a
> different buffer. Here's what I'm seeing, which confuses me:
>
> (with-current-buffer (get-buffer nnir-tmp-buffer)
>   nngnorb-attachment-file-list) --> proper, populated value
>
> (buffer-local-value
>  nngnorb-attachment-file-list
>  (get-buffer nnir-tmp-buffer)) --> nil

Missing quote?  E.g.

(buffer-local-value
 'nngnorb-attachment-file-list
 (get-buffer nnir-tmp-buffer))


HTH,  Marco
-- 
http://www.wahlzone.de
PGP: 0x0A3AE6F2

Re: buffer-local-value confusion

[Thorsten Jolitz]

Eric Abrahamsen <eric@ericabrahamsen.net> writes:

> I have defined a buffer-local variable like this:
>
> (defvar nngnorb-attachment-file-list nil)
> (make-variable-buffer-local 'nngnorb-attachment-file-list)
>
> I'm first setting a value for it in the buffer referred to by
> nnir-tmp-buffer, then trying to copy that buffer-local value to a
> different buffer. Here's what I'm seeing, which confuses me:
>
> (with-current-buffer (get-buffer nnir-tmp-buffer)
>   nngnorb-attachment-file-list) --> proper, populated value
>
> (buffer-local-value
>  nngnorb-attachment-file-list
>  (get-buffer nnir-tmp-buffer)) --> nil
>
> I thought this was the whole point of buffer-local-value? Am I doing it
> wrong?
>
> On the other hand, using with-current-buffer is almost precisely the
> same number of characters as buffer-local-value, so maybe there's no
> point in insisting on the latter...


you might want to look at


,----[ C-h f org-get-local-variables RET ]
| org-get-local-variables is a compiled Lisp function in `org.el'.
| 
| (org-get-local-variables)
| 
| Return a list of all local variables in an Org mode buffer.
| 
| [back]
`----

,----[ C-h f org-clone-local-variables RET ]
| org-clone-local-variables is a compiled Lisp function in `org.el'.
| 
| (org-clone-local-variables FROM-BUFFER &optional REGEXP)
| 
| Clone local variables from FROM-BUFFER.
| Optional argument REGEXP selects variables to clone.
| 
| [back]
`----

and orgstruct++ in general, because it does exactly that - create an tmp
Org buffer and then transfer the buffer local environment temporarily to
the source-code buffer where an Org cmd is run. 

-- 
cheers,
Thorsten

Re: buffer-local-value confusion

[Eric Abrahamsen]

Marco Wahl <marcowahlsoft@gmail.com> writes:

> Eric Abrahamsen <eric@ericabrahamsen.net> writes:
>
>> (defvar nngnorb-attachment-file-list nil)
>> (make-variable-buffer-local 'nngnorb-attachment-file-list)
>>
>> I'm first setting a value for it in the buffer referred to by
>> nnir-tmp-buffer, then trying to copy that buffer-local value to a
>> different buffer. Here's what I'm seeing, which confuses me:
>>
>> (with-current-buffer (get-buffer nnir-tmp-buffer)
>>   nngnorb-attachment-file-list) --> proper, populated value
>>
>> (buffer-local-value
>>  nngnorb-attachment-file-list
>>  (get-buffer nnir-tmp-buffer)) --> nil
>
> Missing quote?  E.g.
>
> (buffer-local-value
>  'nngnorb-attachment-file-list
>  (get-buffer nnir-tmp-buffer))

Dangit, that was it! That's the first time I've run into a
quoted/not-quoted mistake that didn't result in an error, so that didn't
even occur to me.

Thanks!
Eric