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Re: describe-variable error when using dir-locals-set-directory-class
From: |
Michael Heerdegen |
Subject: |
Re: describe-variable error when using dir-locals-set-directory-class |
Date: |
Tue, 09 Jul 2013 03:40:43 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.3.50 (gnu/linux) |
Hongxu Chen <leftcopy.chx@gmail.com> writes:
> Hi,
>
> I followed the docs on this page
>
> http://www.gnu.org/software/emacs/manual/html_node/emacs/Directory-Variables.html
> and does some tweaks for the directory variables for ffap-c-path.
>
> #+BEGIN_SRC emacs-lisp
> (dir-locals-set-class-variables 'llvm-3.4-directory
> '((nil . ((ffap-c-path .
> ("/usr/lib/llvm-3.4/include"))))))
> (dir-locals-set-directory-class
> "/usr/lib/llvm-3.4/include/clang-c/" 'llvm-3.4-directory)
> #+END_SRC
>
> However when I try `C-h v ffap-c-path', there is an error;
> when I `toggle-debug-on-error', it reports:
>
> #+BEGIN_SRC emacs-lisp
> Debugger entered--Lisp error: (wrong-type-argument char-or-string-p
> ("/usr/lib/llvm-3.4/include/clang-c/" llvm-3\.4-directory nil))
> insert-text-button(("/usr/lib/llvm-3.4/include/clang-c/"
> llvm-3\.4-directory nil) type help-dir-local-var-def help-args
> (ac-clang-flags ("/usr/lib/llvm-3.4/include/clang-c/" llvm-3\.4-directory
> nil)))
> describe-variable(ac-clang-flags)
> call-interactively(describe-variable nil nil)
> #+END_SRC
>
> And describe-variable ONLY sucks for those variables that are set
> using this sort of syntax.
That looks like a bug to me. Although I can't reproduce it here with
trunk. When I follow your recipe, I get a help buffer looking normal:
,----------------------------------------------------------------------
| ffap-c-path is a variable defined in `ffap.el'.
| Its value is ("/usr/lib/llvm-3.4/include")
| Local in buffer micha; global value is
| ("/usr/include" "/usr/local/include" "/usr/include/x86_64-linux-gnu")
|
|
| This variable's value is directory-local.
|
| Documentation:
| List of directories to search for include files.
|
`----------------------------------------------------------------------
What's your Emacs version, and does this happen with emacs -Q?
> Also, I am wondering whether this kind of directory variable setting
> can accept `evil' syntax just as `.dir-locals.el' does.
Sorry, I can't answer that. Maybe someone else can help.
Regards,
Michael.