Re: %? has no effect for org-agenda-prefix-format

[Christophe Schockaert <R3vLibre@citadels.eu>]

Markus Heller writes:

> Excerpt from describe-variable org-agenda-prefix-format:
>
> If the first character after `%' is a question mark, the entire field
> will only be included if the corresponding value applies to the current
> entry.  [...]
>
> [...]
> Here's the definition of org-agenda-prefix-format from my .emacs:
>
> <excerpt from .emacs>
> ((org-agenda-prefix-format "  %-5c %?-4(setq type (org-entry-get (point) 
> \"Type\")): ")
> </excerpt from .emacs>
Hi Markus,

Glad I could feed you with the trick you expected !

As for the "?" modifier, I wonder if I didn't stumble on that too.

However, we can achieve the functionnality we want in this field, since
we have free lisp there.

I used an "if" to return "" when the property is not defined, resulting in
a 0 width output, so I get the same behaviour as the "?".

Then, if you need formatting, I don't remember if the width formating is
taken into account. In any case, I think you could obtain that result
with string formatting inside the "%(expression)" itself
(https://www.gnu.org/software/emacs/manual/html_node/elisp/Formatting-Strings.html).

Format width aside, I guess the behavior for the "?" would not be easy
to define: as the content built within "%(expr)" is free, how can we define "the
corresponding value applies to the current entry" ?

It would be nice if it was explained in the docstring however.


Cheerfully,

Christophe

> There is a similar thread on stackexchange from March 10 on this 
> (http://stackoverflow.com/questions/35910204/org-agenda-prefix-format-
> does-not-work).
>
> Is this a bug?
>
> Thanks
> Markus

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