mirror/emacs
1
0
Fork 0
mirror of https://git.savannah.gnu.org/git/emacs.git synced 2024-12-15 09:47:20 +00:00
Code Issues Releases Activity
6e66e4c6fc
emacs/lisp/gnus/gnus-int.el
Lars Magne Ingebrigtsen 6748645fc3 Upgrading to Gnus 5.7; see ChangeLog
1999-02-20 14:05:57 +00:00

510 lines
20 KiB
EmacsLisp
Raw Blame History

This file contains invisible Unicode characters

This file contains invisible Unicode characters that are indistinguishable to humans but may be processed differently by a computer. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

;;; gnus-int.el --- backend interface functions for Gnus
;; Copyright (C) 1996,97,98 Free Software Foundation, Inc.
;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
;; Keywords: news
;; This file is part of GNU Emacs.
;; GNU Emacs is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 2, or (at your option)
;; any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING. If not, write to the
;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.
;;; Commentary:
;;; Code:
(eval-when-compile (require 'cl))
(eval-when-compile (require 'cl))
(require 'gnus)
(defcustom gnus-open-server-hook nil
"Hook called just before opening connection to the news server."
:group 'gnus-start
:type 'hook)
;;;
;;; Server Communication
;;;
(defun gnus-start-news-server (&optional confirm)
"Open a method for getting news.
If CONFIRM is non-nil, the user will be asked for an NNTP server."
(let (how)
(if gnus-current-select-method
;; Stream is already opened.
nil
;; Open NNTP server.
(unless gnus-nntp-service
(setq gnus-nntp-server nil))
(when confirm
;; Read server name with completion.
(setq gnus-nntp-server
(completing-read "NNTP server: "
(mapcar (lambda (server) (list server))
(cons (list gnus-nntp-server)
gnus-secondary-servers))
nil nil gnus-nntp-server)))
(when (and gnus-nntp-server
(stringp gnus-nntp-server)
(not (string= gnus-nntp-server "")))
(setq gnus-select-method
(cond ((or (string= gnus-nntp-server "")
(string= gnus-nntp-server "::"))
(list 'nnspool (system-name)))
((string-match "^:" gnus-nntp-server)
(list 'nnmh gnus-nntp-server
(list 'nnmh-directory
(file-name-as-directory
(expand-file-name
(concat "~/" (substring
gnus-nntp-server 1)))))
(list 'nnmh-get-new-mail nil)))
(t
(list 'nntp gnus-nntp-server)))))
(setq how (car gnus-select-method))
(cond
((eq how 'nnspool)
(require 'nnspool)
(gnus-message 5 "Looking up local news spool..."))
((eq how 'nnmh)
(require 'nnmh)
(gnus-message 5 "Looking up mh spool..."))
(t
(require 'nntp)))
(setq gnus-current-select-method gnus-select-method)
(gnus-run-hooks 'gnus-open-server-hook)
(or
;; gnus-open-server-hook might have opened it
(gnus-server-opened gnus-select-method)
(gnus-open-server gnus-select-method)
(gnus-y-or-n-p
(format
"%s (%s) open error: '%s'. Continue? "
(car gnus-select-method) (cadr gnus-select-method)
(gnus-status-message gnus-select-method)))
(gnus-error 1 "Couldn't open server on %s"
(nth 1 gnus-select-method))))))
(defun gnus-check-group (group)
"Try to make sure that the server where GROUP exists is alive."
(let ((method (gnus-find-method-for-group group)))
(or (gnus-server-opened method)
(gnus-open-server method))))
(defun gnus-check-server (&optional method silent)
"Check whether the connection to METHOD is down.
If METHOD is nil, use `gnus-select-method'.
If it is down, start it up (again)."
(let ((method (or method gnus-select-method)))
;; Transform virtual server names into select methods.
(when (stringp method)
(setq method (gnus-server-to-method method)))
(if (gnus-server-opened method)
;; The stream is already opened.
t
;; Open the server.
(unless silent
(gnus-message 5 "Opening %s server%s..." (car method)
(if (equal (nth 1 method) "") ""
(format " on %s" (nth 1 method)))))
(gnus-run-hooks 'gnus-open-server-hook)
(prog1
(gnus-open-server method)
(unless silent
(message ""))))))
(defun gnus-get-function (method function &optional noerror)
"Return a function symbol based on METHOD and FUNCTION."
;; Translate server names into methods.
(unless method
(error "Attempted use of a nil select method"))
(when (stringp method)
(setq method (gnus-server-to-method method)))
;; Check cache of constructed names.
(let* ((method-sym (if gnus-agent
(gnus-agent-get-function method)
(car method)))
(method-fns (get method-sym 'gnus-method-functions))
(func (let ((method-fnlist-elt (assq function method-fns)))
(unless method-fnlist-elt
(setq method-fnlist-elt
(cons function
(intern (format "%s-%s" method-sym function))))
(put method-sym 'gnus-method-functions
(cons method-fnlist-elt method-fns)))
(cdr method-fnlist-elt))))
;; Maybe complain if there is no function.
(unless (fboundp func)
(unless (car method)
(error "Trying to require a method that doesn't exist"))
(require (car method))
(when (not (fboundp func))
(if noerror
(setq func nil)
(error "No such function: %s" func))))
func))
;;;
;;; Interface functions to the backends.
;;;
(defun gnus-open-server (gnus-command-method)
"Open a connection to GNUS-COMMAND-METHOD."
(when (stringp gnus-command-method)
(setq gnus-command-method (gnus-server-to-method gnus-command-method)))
(let ((elem (assoc gnus-command-method gnus-opened-servers)))
;; If this method was previously denied, we just return nil.
(if (eq (nth 1 elem) 'denied)
(progn
(gnus-message 1 "Denied server")
nil)
;; Open the server.
(let ((result
(funcall (gnus-get-function gnus-command-method 'open-server)
(nth 1 gnus-command-method)
(nthcdr 2 gnus-command-method))))
;; If this hasn't been opened before, we add it to the list.
(unless elem
(setq elem (list gnus-command-method nil)
gnus-opened-servers (cons elem gnus-opened-servers)))
;; Set the status of this server.
(setcar (cdr elem) (if result 'ok 'denied))
;; Return the result from the "open" call.
result))))
(defun gnus-close-server (gnus-command-method)
"Close the connection to GNUS-COMMAND-METHOD."
(when (stringp gnus-command-method)
(setq gnus-command-method (gnus-server-to-method gnus-command-method)))
(funcall (gnus-get-function gnus-command-method 'close-server)
(nth 1 gnus-command-method)))
(defun gnus-request-list (gnus-command-method)
"Request the active file from GNUS-COMMAND-METHOD."
(when (stringp gnus-command-method)
(setq gnus-command-method (gnus-server-to-method gnus-command-method)))
(funcall (gnus-get-function gnus-command-method 'request-list)
(nth 1 gnus-command-method)))
(defun gnus-request-list-newsgroups (gnus-command-method)
"Request the newsgroups file from GNUS-COMMAND-METHOD."
(when (stringp gnus-command-method)
(setq gnus-command-method (gnus-server-to-method gnus-command-method)))
(funcall (gnus-get-function gnus-command-method 'request-list-newsgroups)
(nth 1 gnus-command-method)))
(defun gnus-request-newgroups (date gnus-command-method)
"Request all new groups since DATE from GNUS-COMMAND-METHOD."
(when (stringp gnus-command-method)
(setq gnus-command-method (gnus-server-to-method gnus-command-method)))
(let ((func (gnus-get-function gnus-command-method 'request-newgroups t)))
(when func
(funcall func date (nth 1 gnus-command-method)))))
(defun gnus-server-opened (gnus-command-method)
"Check whether a connection to GNUS-COMMAND-METHOD has been opened."
(when (stringp gnus-command-method)
(setq gnus-command-method (gnus-server-to-method gnus-command-method)))
(funcall (inline (gnus-get-function gnus-command-method 'server-opened))
(nth 1 gnus-command-method)))
(defun gnus-status-message (gnus-command-method)
"Return the status message from GNUS-COMMAND-METHOD.
If GNUS-COMMAND-METHOD is a string, it is interpreted as a group name. The method
this group uses will be queried."
(let ((gnus-command-method
(if (stringp gnus-command-method)
(gnus-find-method-for-group gnus-command-method)
gnus-command-method)))
(funcall (gnus-get-function gnus-command-method 'status-message)
(nth 1 gnus-command-method))))
(defun gnus-request-regenerate (gnus-command-method)
"Request a data generation from GNUS-COMMAND-METHOD."
(when (stringp gnus-command-method)
(setq gnus-command-method (gnus-server-to-method gnus-command-method)))
(funcall (gnus-get-function gnus-command-method 'request-regenerate)
(nth 1 gnus-command-method)))
(defun gnus-request-group (group &optional dont-check gnus-command-method)
"Request GROUP. If DONT-CHECK, no information is required."
(let ((gnus-command-method
(or gnus-command-method (inline (gnus-find-method-for-group group)))))
(when (stringp gnus-command-method)
(setq gnus-command-method
(inline (gnus-server-to-method gnus-command-method))))
(funcall (inline (gnus-get-function gnus-command-method 'request-group))
(gnus-group-real-name group) (nth 1 gnus-command-method)
dont-check)))
(defun gnus-list-active-group (group)
"Request active information on GROUP."
(let ((gnus-command-method (gnus-find-method-for-group group))
(func 'list-active-group))
(when (gnus-check-backend-function func group)
(funcall (gnus-get-function gnus-command-method func)
(gnus-group-real-name group) (nth 1 gnus-command-method)))))
(defun gnus-request-group-description (group)
"Request a description of GROUP."
(let ((gnus-command-method (gnus-find-method-for-group group))
(func 'request-group-description))
(when (gnus-check-backend-function func group)
(funcall (gnus-get-function gnus-command-method func)
(gnus-group-real-name group) (nth 1 gnus-command-method)))))
(defun gnus-close-group (group)
"Request the GROUP be closed."
(let ((gnus-command-method (inline (gnus-find-method-for-group group))))
(funcall (gnus-get-function gnus-command-method 'close-group)
(gnus-group-real-name group) (nth 1 gnus-command-method))))
(defun gnus-retrieve-headers (articles group &optional fetch-old)
"Request headers for ARTICLES in GROUP.
If FETCH-OLD, retrieve all headers (or some subset thereof) in the group."
(let ((gnus-command-method (gnus-find-method-for-group group)))
(if (and gnus-use-cache (numberp (car articles)))
(gnus-cache-retrieve-headers articles group fetch-old)
(funcall (gnus-get-function gnus-command-method 'retrieve-headers)
articles (gnus-group-real-name group)
(nth 1 gnus-command-method) fetch-old))))
(defun gnus-retrieve-articles (articles group)
"Request ARTICLES in GROUP."
(let ((gnus-command-method (gnus-find-method-for-group group)))
(funcall (gnus-get-function gnus-command-method 'retrieve-articles)
articles (gnus-group-real-name group)
(nth 1 gnus-command-method))))
(defun gnus-retrieve-groups (groups gnus-command-method)
"Request active information on GROUPS from GNUS-COMMAND-METHOD."
(when (stringp gnus-command-method)
(setq gnus-command-method (gnus-server-to-method gnus-command-method)))
(funcall (gnus-get-function gnus-command-method 'retrieve-groups)
groups (nth 1 gnus-command-method)))
(defun gnus-request-type (group &optional article)
"Return the type (`post' or `mail') of GROUP (and ARTICLE)."
(let ((gnus-command-method (gnus-find-method-for-group group)))
(if (not (gnus-check-backend-function
'request-type (car gnus-command-method)))
'unknown
(funcall (gnus-get-function gnus-command-method 'request-type)
(gnus-group-real-name group) article))))
(defun gnus-request-update-mark (group article mark)
"Allow the backend to change the mark the user tries to put on an article."
(let ((gnus-command-method (gnus-find-method-for-group group)))
(if (not (gnus-check-backend-function
'request-update-mark (car gnus-command-method)))
mark
(funcall (gnus-get-function gnus-command-method 'request-update-mark)
(gnus-group-real-name group) article mark))))
(defun gnus-request-article (article group &optional buffer)
"Request the ARTICLE in GROUP.
ARTICLE can either be an article number or an article Message-ID.
If BUFFER, insert the article in that group."
(let ((gnus-command-method (gnus-find-method-for-group group)))
(funcall (gnus-get-function gnus-command-method 'request-article)
article (gnus-group-real-name group)
(nth 1 gnus-command-method) buffer)))
(defun gnus-request-head (article group)
"Request the head of ARTICLE in GROUP."
(let* ((gnus-command-method (gnus-find-method-for-group group))
(head (gnus-get-function gnus-command-method 'request-head t))
res clean-up)
(cond
;; Check the cache.
((and gnus-use-cache
(numberp article)
(gnus-cache-request-article article group))
(setq res (cons group article)
clean-up t))
;; Use `head' function.
((fboundp head)
(setq res (funcall head article (gnus-group-real-name group)
(nth 1 gnus-command-method))))
;; Use `article' function.
(t
(setq res (gnus-request-article article group)
clean-up t)))
(when clean-up
(save-excursion
(set-buffer nntp-server-buffer)
(goto-char (point-min))
(when (search-forward "\n\n" nil t)
(delete-region (1- (point)) (point-max)))
(nnheader-fold-continuation-lines)))
res))
(defun gnus-request-body (article group)
"Request the body of ARTICLE in GROUP."
(let* ((gnus-command-method (gnus-find-method-for-group group))
(head (gnus-get-function gnus-command-method 'request-body t))
res clean-up)
(cond
;; Check the cache.
((and gnus-use-cache
(numberp article)
(gnus-cache-request-article article group))
(setq res (cons group article)
clean-up t))
;; Use `head' function.
((fboundp head)
(setq res (funcall head article (gnus-group-real-name group)
(nth 1 gnus-command-method))))
;; Use `article' function.
(t
(setq res (gnus-request-article article group)
clean-up t)))
(when clean-up
(save-excursion
(set-buffer nntp-server-buffer)
(goto-char (point-min))
(when (search-forward "\n\n" nil t)
(delete-region (point-min) (1- (point))))))
res))
(defun gnus-request-post (gnus-command-method)
"Post the current buffer using GNUS-COMMAND-METHOD."
(when (stringp gnus-command-method)
(setq gnus-command-method (gnus-server-to-method gnus-command-method)))
(funcall (gnus-get-function gnus-command-method 'request-post)
(nth 1 gnus-command-method)))
(defun gnus-request-scan (group gnus-command-method)
"Request a SCAN being performed in GROUP from GNUS-COMMAND-METHOD.
If GROUP is nil, all groups on GNUS-COMMAND-METHOD are scanned."
(when gnus-plugged
(let ((gnus-command-method
(if group (gnus-find-method-for-group group) gnus-command-method))
(gnus-inhibit-demon t))
(funcall (gnus-get-function gnus-command-method 'request-scan)
(and group (gnus-group-real-name group))
(nth 1 gnus-command-method)))))
(defsubst gnus-request-update-info (info gnus-command-method)
"Request that GNUS-COMMAND-METHOD update INFO."
(when (stringp gnus-command-method)
(setq gnus-command-method (gnus-server-to-method gnus-command-method)))
(when (gnus-check-backend-function
'request-update-info (car gnus-command-method))
(funcall (gnus-get-function gnus-command-method 'request-update-info)
(gnus-group-real-name (gnus-info-group info))
info (nth 1 gnus-command-method))))
(defun gnus-request-expire-articles (articles group &optional force)
(let ((gnus-command-method (gnus-find-method-for-group group)))
(funcall (gnus-get-function gnus-command-method 'request-expire-articles)
articles (gnus-group-real-name group) (nth 1 gnus-command-method)
force)))
(defun gnus-request-move-article
(article group server accept-function &optional last)
(let ((gnus-command-method (gnus-find-method-for-group group)))
(funcall (gnus-get-function gnus-command-method 'request-move-article)
article (gnus-group-real-name group)
(nth 1 gnus-command-method) accept-function last)))
(defun gnus-request-accept-article (group &optional gnus-command-method last)
;; Make sure there's a newline at the end of the article.
(when (stringp gnus-command-method)
(setq gnus-command-method (gnus-server-to-method gnus-command-method)))
(when (and (not gnus-command-method)
(stringp group))
(setq gnus-command-method (gnus-group-name-to-method group)))
(goto-char (point-max))
(unless (bolp)
(insert "\n"))
(let ((func (car (or gnus-command-method
(gnus-find-method-for-group group)))))
(funcall (intern (format "%s-request-accept-article" func))
(if (stringp group) (gnus-group-real-name group) group)
(cadr gnus-command-method)
last)))
(defun gnus-request-replace-article (article group buffer)
(let ((func (car (gnus-group-name-to-method group))))
(funcall (intern (format "%s-request-replace-article" func))
article (gnus-group-real-name group) buffer)))
(defun gnus-request-associate-buffer (group)
(let ((gnus-command-method (gnus-find-method-for-group group)))
(funcall (gnus-get-function gnus-command-method 'request-associate-buffer)
(gnus-group-real-name group))))
(defun gnus-request-restore-buffer (article group)
"Request a new buffer restored to the state of ARTICLE."
(let ((gnus-command-method (gnus-find-method-for-group group)))
(funcall (gnus-get-function gnus-command-method 'request-restore-buffer)
article (gnus-group-real-name group)
(nth 1 gnus-command-method))))
(defun gnus-request-create-group (group &optional gnus-command-method args)
(when (stringp gnus-command-method)
(setq gnus-command-method (gnus-server-to-method gnus-command-method)))
(let ((gnus-command-method
(or gnus-command-method (gnus-find-method-for-group group))))
(funcall (gnus-get-function gnus-command-method 'request-create-group)
(gnus-group-real-name group) (nth 1 gnus-command-method) args)))
(defun gnus-request-delete-group (group &optional force)
(let ((gnus-command-method (gnus-find-method-for-group group)))
(funcall (gnus-get-function gnus-command-method 'request-delete-group)
(gnus-group-real-name group) force (nth 1 gnus-command-method))))
(defun gnus-request-rename-group (group new-name)
(let ((gnus-command-method (gnus-find-method-for-group group)))
(funcall (gnus-get-function gnus-command-method 'request-rename-group)
(gnus-group-real-name group)
(gnus-group-real-name new-name) (nth 1 gnus-command-method))))
(defun gnus-close-backends ()
;; Send a close request to all backends that support such a request.
(let ((methods gnus-valid-select-methods)
(gnus-inhibit-demon t)
func gnus-command-method)
(while (setq gnus-command-method (pop methods))
(when (fboundp (setq func (intern
(concat (car gnus-command-method)
"-request-close"))))
(funcall func)))))
(defun gnus-asynchronous-p (gnus-command-method)
(let ((func (gnus-get-function gnus-command-method 'asynchronous-p t)))
(when (fboundp func)
(funcall func))))
(defun gnus-remove-denial (gnus-command-method)
(when (stringp gnus-command-method)
(setq gnus-command-method (gnus-server-to-method gnus-command-method)))
(let* ((elem (assoc gnus-command-method gnus-opened-servers))
(status (cadr elem)))
;; If this hasn't been opened before, we add it to the list.
(when (eq status 'denied)
;; Set the status of this server.
(setcar (cdr elem) 'closed))))
(provide 'gnus-int)
;;; gnus-int.el ends here
Reference in New Issue View Git Blame Copy Permalink