,----
| To: Robert Goldman <rpgold...@sift.info>
| cc: emacs-orgmode@gnu.org
| From: Nick Dokos <nicholas.do...@hp.com>
| Cc: nicholas.do...@hp.com
| Reply-to: nicholas.do...@hp.com
| Subject: Re: [Orgmode] Re: Emacs-orgmode Digest, Vol 39, Issue 122
| X-Mailer: MH-E 8.1; nmh 1.2; GNU Emacs 23.0.93
| Date: Sat, 30 May 2009 15:39:40 -0400
| Sender: n...@gamaville.dokosmarshall.org
|
| Robert Goldman <rpgold...@sift.info> wrote:
|
| > > Date: Fri, 29 May 2009 23:24:58 -0700
| > > From: Keith Swartz <g...@oneroad.com>
| > > Subject: [Orgmode] Lazy evaluation when defining
org-remember-template
| > > To: "[orgmode]" <emacs-orgmode@gnu.org>
| > > Message-ID: <4a20d13a.2000...@oneroad.com>
| > > Content-Type: text/plain; charset=ISO-8859-1; format=flowed
| > >
| > > ...
| > >
| > > Is there a way I can make that command evaluate at the time it is
| > > invoked, rather than when it is defined? I vaguely recall doing
| > > something like this, but that was five job roles, three houses,
two
| > > recessions, and two kids ago. :)
| > >
| >
| > I can't swear that this will work, but note that the way you have
| > written this, it will all be evaluated at load time, as you say.
the
| > 'list' function will evaluate its arguments to build the list.
| >
| > Now, if you don't want this to be evaluated when
org-remember-templates
| > is set, you can quote the form:
| >
| > '(format-time-string "%A")
| >
| > [note that you quoted the argument to format-time-string. I don't
| > believe that's necessary, since strings evaluate to themselves,
but I
| > have not tested this.]
| >
| > Actually, I think you would get something easier to read if you
quoted
| > the whole list, instead of quoting each element. Something like:
| >
| > (list '("Todo" ?t "* TODO %?%^{To do} %^g\n :LOGBOOK:\n -
| > Added: %U\n :END:" "d:/tmp/_my.todo" (format-time-string "%A"))))
| >
|
| That's correct.
|
| > The question then is, "what happens when org-remember-templates is
| > retrieved?" What you want is for this function to be evaluated
when the
| > templates are found and used. That will be done by
| > org-remember-apply-template, which we can examine....
| >
| > Unfortunately, I don't see in there anything which retrieves (nth 4
| > entry), which is the place where your format-time-string goes, so
I'm
| > not sure what is handling this. It's a little confusing reading
that
| > function's code, since "headline" is ambiguous between whether it
means
| > the headline of the remember note to be inserted or the headline
under
| > which to insert the note... I believe it's the former.
| >
|
| It's the latter.
|
| You can figure out things like this fairly quickly by inserting a
| (debug) at the appropriate place, and re-evaluating the defun. When
the
| function gets called, it will jump into the debugger when it evals the
| (debug) form, and you can use the full power of lisp to examine
| state. For example, here I defined the template the way you suggested,
| placed a (debug) in org-remember-apply-template, just after the
| insertion of the template in the remember buffer, re-evaluated the
defun
| (there is an eval-defun, but I prefer to do that by going to the
end of
| the defun - which I can do quickly: repeat M-C-u until I'm at the
| beginning of the defun and M-C-f to move over the whole defun - and
then
| C-x C-e to eval the last sexpression.)
|
| I then call org-remember and in the resulting debug buffer, say
|
| e headline<RET>
|
| which says
|
| (format-time-string "%A")
|
| e entry<RET>
|
| which says
|
| ("* TODO %?%^{To do} %^g
| :LOGBOOK:
| -
| Added: %U
| :END:" (quote "d:/tmp/_my.todo") (format-time-string "%A"))
|
| Now you can see that the headline is the third element of this list
| (i.e. (nth 2 entry) - the numbering starts from 0).
|
| > Perhaps someone else can figure this out, or perhaps you could
just try
| > quoting the list and seeing if it works to evaluate the
| > format-time-string when you want it to. Org usually does The
Right Thing.
| >
| But even org cannot perform miracles !-) Somebody has to "force the
thunk"
| in order for delayed evaluation to work. You'd need something like
this
| patch:
|
| --- a/lisp/org-remember.el
| +++ b/lisp/org-remember.el
| @@ -388,7 +388,7 @@ to be run from that hook to function properly."
| (functionp (nth 1 entry))))
| (nth 1 entry)
| org-default-notes-file))
| - (headline (nth 2 entry))
| + (headline (eval (nth 2 entry)))
| (v-c (and (> (length kill-ring) 0) (current-kill 0)))
| (v-x (or (org-get-x-clipboard 'PRIMARY)
| (org-get-x-clipboard 'CLIPBOARD)
|
| This should work in simple cases (in particular, because the
headline is
| a string and strings evaluate to themselves, so it should not
adversely affect
| any existing template), but I certainly have not thought about
repercussions
| (including the possibility of *very* obscure bugs because somebody
mistyped
| something in the template - that would be a maintenance nightmare
that Carsten
| might not be willing to take on).
|
| Thanks,
| Nick
`----
HTH,
Nick
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