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Re: Confused about buffer-local variables


From: Thorsten Jolitz
Subject: Re: Confused about buffer-local variables
Date: Mon, 31 Mar 2014 23:10:27 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3 (gnu/linux)

Nicolas Richard <address@hidden> writes:

> Thorsten Jolitz <address@hidden> writes:
>> assume function `foo' is defined in library A and uses variable `bar'
>> defined in that library with value "X". Now I call function `foo' from a
>> buffer where variable `bar' is set as a buffer-local variable to a
>> different value "Y".
>>
>> Which value is `foo' going to use - "X" or "Y"? I would have said "Y"
>> but feel a bit confused right now ...
>
> I'd say 'Y' also, but maybe I'm confused and I do not know it. Do you
> have any code sample that doesn't do what you expected ?

You are right, I should have rather tested it:

Evaluating library mylib.el:

,--------------------------
| (defvar mylib-bar "X")
| 
| (defun mylib-foo ()
|   (print mylib-bar))
`--------------------------

after opening buffer local-var-test.org:

,---------------------
| * 1st Level
| 
| Lorem Ipsum
| 
|   # Local Variables:
|   # mylib-bar: "Y"
|   # End:
`---------------------

does not change the expected result when doing 

,----------------------
| M-: (mylib-foo)
`----------------------

with point in buffer local-var-test.org:

,----
| "Y"
`----

-- 
cheers,
Thorsten




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