Function: nnagent-retrieve-headers

nnagent-retrieve-headers is a byte-compiled function defined in nnagent.el.gz.

Signature

(nnagent-retrieve-headers ARTICLES &optional GROUP SERVER FETCH-OLD)

Source Code

;; Defined in /usr/src/emacs/lisp/gnus/nnagent.el.gz
(deffoo nnagent-retrieve-headers (articles &optional group _server fetch-old)
  (let ((file (gnus-agent-article-name ".overview" group))
	arts n first)
    (save-excursion
      (gnus-agent-load-alist group)
      (setq arts (gnus-sorted-difference
		  articles (mapcar #'car gnus-agent-article-alist)))
      ;; Assume that articles with smaller numbers than the first one
      ;; Agent knows are gone.
      (setq first (caar gnus-agent-article-alist))
      (when first
	(while (and arts (< (car arts) first))
	  (pop arts)))
      (set-buffer nntp-server-buffer)
      (erase-buffer)
      (let ((file-name-coding-system nnmail-pathname-coding-system))
	(nnheader-insert-nov-file file (car articles)))
      (goto-char (point-min))
      (gnus-parse-without-error
	(while (and arts (not (eobp)))
	  (setq n (read (current-buffer)))
	  (when (> n (car arts))
	    (beginning-of-line))
	  (while (and arts (> n (car arts)))
	    (insert (format
		     "%d\t[Undownloaded article %d]\tGnus Agent\t\t\t\n"
		     (car arts) (car arts)))
	    (pop arts))
	  (when (and arts (= n (car arts)))
	    (pop arts))
	  (forward-line 1)))
      (while arts
	(insert (format
		 "%d\t[Undownloaded article %d]\tGnus Agent\t\t\t\n"
		 (car arts) (car arts)))
	(pop arts))
      (if (and fetch-old
	       (not (numberp fetch-old)))
	  t				; Don't remove anything.
	(nnheader-nov-delete-outside-range
	 (if fetch-old (max 1 (- (car articles) fetch-old))
	   (car articles))
	 (car (last articles)))
	t)
      'nov)))