At Fri, 17 Jun 2011 21:30:51 +0400,
Евгений Курбатов wrote:
>
> Hello!
>
> I do some elisp code to download the latest RSS feeds from some resource:
>
> (setq debug-on-error t)
> (org-mode)
> (org-feed-update
> '("arxiv"
> "http://export.arxiv.org/rss/astro-ph";
> (concat "~/org/arxiv-" (format-time-string "%Y-%m-%d.org"))
> "arXiv.org"
> )
> )
>
> The goal is to get an unique Org file for feeds per day. However, the error
> is rising:
>
> Debugger entered--Lisp error: (wrong-type-argument stringp (concat
> "~/org/arxiv-" (format-time-string "%Y-%m-%d.org")))
> expand-file-name((concat "~/org/arxiv-" (format-time-string
> "%Y-%m-%d.org")))
> find-file-noselect((concat "~/org/arxiv-" (format-time-string
> "%Y-%m-%d.org")) nil nil nil)
> find-file((concat "~/org/arxiv-" (format-time-string "%Y-%m-%d.org")))
> org-feed-goto-inbox-internal((concat "~/org/arxiv-" (format-time-string
> "%Y-%m-%d.org")) "arXiv.org")
> byte-code("\306 \"\307\n\"\310\311
> \"\211\312+\211,\203]
>
> When I hardcode a string instead of (concat ...) everything is
> ok. The subject is also not in format-time-string, it is exactly in
> concat. The type returned by concat is the stringp, so the situation
> is very strange. I also tried to use org-feed-alist, and local
> variable instead of calling concat, nothing helps.
The quote in front of ("arxiv"
> '("arxiv"
"quotes" the following list, i.e. Emacs does not evaluate the Lisp
expressions inside the list but processes it as pure data.
To calculate the file name each time you call `org-feed-update' either
leave out the quotes like:
(org-feed-update (list "arxiv" "http://export.arxiv.org/rss/astro-ph"; (concat …
)))
-or-
Use backquotes:
http://www.gnu.org/s/emacs/manual/html_node/elisp/Backquote.html
(org-feed-update
`("arxiv"
"http://export.arxiv.org/rss/astro-ph";
,(concat "~/org/arxiv-" (format-time-string "%Y-%m-%d.org"))
"arXiv.org"
)
)
The ` means: The following structure is data except the parts with the
backquote ,.
Best,
-- David
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