From: "Lennart Borgman (gmail)" <lennart.borgman@gmail.com>
To: Alan Mackenzie <acm@muc.de>
Cc: "help-gnu-emacs@gnu.org" <help-gnu-emacs@gnu.org>
Subject: Re: defmacro is worse than my neighbours cat
Date: Sat, 13 Sep 2008 01:33:15 +0200 [thread overview]
Message-ID: <48CAFC3B.3070108@gmail.com> (raw)
In-Reply-To: <20080912231049.GB1075@muc.de>
Alan Mackenzie wrote:
> 'Morning, Lennart!
>
> On Fri, Sep 12, 2008 at 11:13:10PM +0200, Lennart Borgman (gmail) wrote:
>> defmacro is worse than my neighbour's cat.
>
> Miaow!!!
Help!
>> When I think I everything is fine and I calm down they bite.
>
>> I have a defmacro where I define a function and I want to build the doc
>> string for this function in a certain way. This works fine - until I
>> byte compile it. Can someone please try to explain to me how I can do
>> what I want?
>
>> Below is the defmacro. Look for "fix-me".
>
>
>> (defmacro define-mumamo-multi-major-mode (fun-sym spec-doc chunks)
>> "Define a function that turn on support for multiple major modes."
>> (let* ((mumamo-describe-chunks (make-symbol "mumamo-describe-chunks"))
>
> OK, here's a problem. You have _two_ symbols called
> "mumamo-describe-chunks" here. One (uninterned) is the value of the
> other. Why do this?
My cleaning ability. I have no idea now why I left it there. Maybe it is
just that I am scared of the byte compiler.
>> (turn-on-fun (if (symbolp fun-sym)
>
>> (symbol-value
>> (intern
>> (symbol-name (quote fun-sym))))
>
> This bit seems crazy.
Yes. Thanks. ;-)
> . At least I think it should - it's a bit early at the moment. ;-)
Ok, I am looking forward for the rest ...
> I've got to get to bed, so I can't look at the rest right now.
>
>> (turn-on-hook (intern (concat (symbol-name turn-on-fun) "-hook")))
>> (turn-on-map (intern (concat (symbol-name turn-on-fun) "-map")))
>> (turn-on-hook-doc (concat "Hook run at the very end of `"
>> (symbol-name turn-on-fun) "'."))
>> (chunks2 (if (symbolp chunks)
>> (symbol-value chunks)
>> chunks))
>> (docstring
>> (concat
>> spec-doc
>> "
>
>> This function is called a multi major mode. The main use for it
>> is in `auto-mode-alist' to have Emacs do this setup whenever you
>> open a file named in a certain way. \(You can of course call
>> this function directly yourself too.)
>
>> It sets up for multiple mode in the following way:
>
>> "
>> ;; Fix-me: During byte compilation the next line is not
>> ;; expanded as I thought because the functions in CHUNK is
>> ;; not defined. How do I fix this?
>> (funcall 'mumamo-describe-chunks chunks2)
>> "
>
>> At the very end this multi major mode function runs first the hook
>> `mumamo-turn-on-hook' and then `" (symbol-name turn-on-hook) "'.
>
>> There is a keymap specific to this multi major mode, but it is
>> not returned by `current-local-map' which returns the chunk's
>> major mode's local keymap.
>
>> The keymap is named `" (symbol-name turn-on-map) "'.
>
>> This major mode has an alias `mumamo-alias-"
>> (symbol-name turn-on-fun) "'.
>> For more information see `define-mumamo-multi-major-mode'."
>> )))
>> `(progn
>> (add-to-list 'mumamo-defined-turn-on-functions (cons (car
>> ',chunks2) ',turn-on-fun))
>> (defvar ,turn-on-hook nil ,turn-on-hook-doc)
>> (defvar ,turn-on-map (make-sparse-keymap)
>> ,(concat "Keymap for multi major mode function `"
>> (symbol-name turn-on-fun) "'"))
>> (defvar ,turn-on-fun nil)
>> (make-variable-buffer-local ',turn-on-fun)
>> (put ',turn-on-fun 'permanent-local t)
>> (defun ,turn-on-fun nil ,docstring
>> (interactive)
>> (let ((old-major-mode (or mumamo-major-mode
>> major-mode)))
>> (kill-all-local-variables)
>> (run-hooks 'change-major-mode-hook)
>> (setq mumamo-multi-major-mode ',turn-on-fun)
>> (setq ,turn-on-fun t)
>> (mumamo-add-multi-keymap ',turn-on-fun ,turn-on-map)
>> (setq mumamo-current-chunk-family (copy-tree ',chunks2))
>> (mumamo-turn-on-actions old-major-mode)
>> (run-hooks ',turn-on-hook)))
>> (defalias ',turn-on-fun-alias ',turn-on-fun)
>> )))
>
prev parent reply other threads:[~2008-09-12 23:33 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-09-12 21:13 defmacro is worse than my neighbours cat Lennart Borgman (gmail)
2008-09-12 23:10 ` Alan Mackenzie
2008-09-12 23:33 ` Lennart Borgman (gmail) [this message]
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