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;;; gnus-int.el --- backend interface functions for Gnus -*- lexical-binding: t; -*-
;; Copyright (C) 1996-2024 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 3 of the License, 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. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;;; Code:
(require 'gnus)
(require 'message)
(require 'gnus-range)
(autoload 'gnus-run-hook-with-args "gnus-util")
(autoload 'gnus-agent-expire "gnus-agent")
(autoload 'gnus-agent-regenerate-group "gnus-agent")
(autoload 'gnus-agent-read-servers-validate-native "gnus-agent")
(autoload 'gnus-agent-possibly-synchronize-flags-server "gnus-agent")
(defcustom gnus-open-server-hook nil
"Hook called just before opening connection to the news server."
:group 'gnus-start
:type 'hook)
(defcustom gnus-after-set-mark-hook nil
"Hook called just after marks are set in a group."
:version "24.1"
:group 'gnus-start
:type 'hook)
(defcustom gnus-before-update-mark-hook nil
"Hook called just before marks are updated in a group."
:version "24.1"
:group 'gnus-start
:type 'hook)
(defcustom gnus-server-unopen-status nil
"The default status if the server is not able to open.
If the server is covered by Gnus agent, the possible values are
`denied', set the server denied; `offline', set the server offline;
nil, ask user. If the server is not covered by Gnus agent, set the
server denied."
:version "22.1"
:group 'gnus-start
:type '(choice (const :tag "Ask" nil)
(const :tag "Deny server" denied)
(const :tag "Unplug Agent" offline)))
;; Note: When this option is finally removed, also remove the entire
;; `gnus-start-news-server' function.
(defcustom gnus-nntp-server nil
"The name of the host running the NNTP server."
:group 'gnus-server
:type '(choice (const :tag "disable" nil)
string))
(make-obsolete-variable 'gnus-nntp-server 'gnus-select-method "24.1")
(defvar gnus-internal-registry-spool-current-method nil
"The current method, for the registry.")
(defun gnus-server-opened (command-method)
"Check whether a connection to COMMAND-METHOD has been opened."
(unless (eq (gnus-server-status command-method)
'denied)
(let ((gnus-command-method
(if (stringp command-method)
(gnus-server-to-method command-method)
command-method)))
(funcall (inline (gnus-get-function gnus-command-method 'server-opened))
(nth 1 gnus-command-method)))))
(defun gnus-status-message (command-method)
"Return the status message from COMMAND-METHOD.
If 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 command-method)
(gnus-find-method-for-group command-method)
command-method)))
(funcall (gnus-get-function gnus-command-method 'status-message)
(nth 1 gnus-command-method))))
;;;
;;; 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.
(when confirm
;; Read server name with completion.
(setq gnus-nntp-server
(gnus-completing-read "NNTP server"
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
(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)
;; Partially validate agent covered methods now that the
;; gnus-select-method is known.
(if gnus-agent
;; NOTE: This is here for one purpose only. By validating
;; the current select method, it converts the old 5.10.3,
;; and earlier, format to the current format. That enables
;; the agent code within gnus-open-server to function
;; correctly.
(gnus-agent-read-servers-validate-native gnus-select-method))
(or
;; gnus-open-server-hook might have opened it
(gnus-server-opened gnus-select-method)
(gnus-open-server gnus-select-method)
gnus-batch-mode
(gnus-y-or-n-p
(format-message
"%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))
result)
;; 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
(setq result (gnus-open-server method))
(unless silent
(gnus-message
(if result 5 3)
"Opening %s server%s...%s" (car method)
(if (equal (nth 1 method) "") ""
(format " on %s" (nth 1 method)))
(if result
"done"
(format "failed: %s"
(nnheader-get-report-string (car method))))))))))
(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
(inline (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-method-denied-p (method)
(eq (nth 1 (assoc method gnus-opened-servers))
'denied))
(defvar gnus-backend-trace nil)
(defvar gnus-backend-trace-elapsed nil)
(defun gnus-backend-trace (type form)
(when gnus-backend-trace
(with-current-buffer (gnus-get-buffer-create "*gnus trace*")
(buffer-disable-undo)
(goto-char (point-max))
(insert (format-time-string "%H:%M:%S")
(format " %.2fs %s %S\n"
(if (numberp gnus-backend-trace-elapsed)
(float-time
(time-since gnus-backend-trace-elapsed))
0)
type form))
(setq gnus-backend-trace-elapsed (float-time)))))
(defun gnus-open-server (command-method)
"Open a connection to COMMAND-METHOD."
(gnus-backend-trace :opening gnus-command-method)
(let* ((gnus-command-method (if (stringp command-method)
(gnus-server-to-method command-method)
command-method))
(elem (assoc gnus-command-method gnus-opened-servers))
(server (gnus-method-to-server-name gnus-command-method)))
;; If this method was previously denied, we just return nil.
(if (eq (nth 1 elem) 'denied)
(progn
(gnus-message
1 "Server %s previously determined to be down; not retrying" server)
nil)
;; Open the server.
(let* ((open-server-function
(gnus-get-function gnus-command-method 'open-server))
(result
(condition-case err
(funcall open-server-function
(nth 1 gnus-command-method)
(nthcdr 2 gnus-command-method))
(error
(gnus-message 1 "Unable to open server %s due to: %s"
server (error-message-string err))
nil)
(quit
(if debug-on-quit
(debug "Quit")
(gnus-message 1 "Quit trying to open server %s" server))
nil)))
open-offline)
;; 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)
(cond (result
(if (eq open-server-function 'nnagent-open-server)
;; The agent's backend has a "special" status
'offline
'ok))
((and gnus-agent
(gnus-agent-method-p gnus-command-method))
(cond
(gnus-server-unopen-status
;; Set the server's status to the unopen
;; status. If that status is offline,
;; recurse to open the agent's backend.
(setq open-offline (eq gnus-server-unopen-status 'offline))
gnus-server-unopen-status)
((not gnus-batch-mode)
(setq open-offline t)
'offline)
(t
;; This agentized server was still denied
'denied)))
(t
;; This unagentized server must be denied
'denied)))
;; NOTE: I MUST set the server's status to offline before this
;; recursive call as this status will drive the
;; gnus-get-function (called above) to return the agent's
;; backend.
(if open-offline
;; Recursively open this offline server to perform the
;; open-server function of the agent's backend.
(let ((gnus-server-unopen-status 'denied))
;; Bind gnus-server-unopen-status to avoid recursively
;; prompting with "go offline?". This is only a concern
;; when the agent's backend fails to open the server.
(gnus-open-server gnus-command-method))
(when (and (eq (cadr elem) 'ok) gnus-agent
(gnus-agent-method-p gnus-command-method))
(save-excursion
(gnus-agent-possibly-synchronize-flags-server
gnus-command-method)))
(gnus-backend-trace :opened gnus-command-method)
result)))))
(defun gnus-close-server (command-method)
"Close the connection to COMMAND-METHOD."
(let ((gnus-command-method
(if (stringp command-method)
(gnus-server-to-method command-method)
command-method)))
(prog1
(funcall (gnus-get-function gnus-command-method 'close-server)
(nth 1 gnus-command-method)
(nthcdr 2 gnus-command-method))
(when-let ((elem (assoc gnus-command-method gnus-opened-servers)))
(setf (nth 1 elem) 'closed)))))
(defun gnus-request-list (command-method)
"Request the active file from COMMAND-METHOD."
(let ((gnus-command-method
(if (stringp command-method)
(gnus-server-to-method command-method)
command-method)))
(funcall (gnus-get-function gnus-command-method 'request-list)
(nth 1 gnus-command-method))))
(defun gnus-server-get-active (server &optional ignored)
"Return the active list for SERVER.
Groups matching the IGNORED regexp are excluded."
(let ((method (gnus-server-to-method server))
groups)
(gnus-request-list method)
(with-current-buffer nntp-server-buffer
(let ((cur (current-buffer)))
(goto-char (point-min))
(unless (or (null ignored)
(string= ignored ""))
(delete-matching-lines ignored))
(if (eq (car method) 'nntp)
(while (not (eobp))
(ignore-errors
(push (gnus-group-full-name
(buffer-substring
(point)
(progn
(skip-chars-forward "^ \t")
(point)))
method)
groups))
(forward-line))
(while (not (eobp))
(ignore-errors
(push (if (eq (char-after) ?\")
(gnus-group-full-name (read cur) method)
(let ((p (point)) (name ""))
(skip-chars-forward "^ \t\\\\")
(setq name (buffer-substring p (point)))
(while (eq (char-after) ?\\)
(setq p (1+ (point)))
(forward-char 2)
(skip-chars-forward "^ \t\\\\")
(setq name (concat name (buffer-substring
p (point)))))
(gnus-group-full-name name method)))
groups))
(forward-line)))))
groups))
(defun gnus-finish-retrieve-group-infos (command-method infos data)
"Read and update infos from COMMAND-METHOD."
(let ((gnus-command-method
(if (stringp command-method)
(gnus-server-to-method command-method)
command-method)))
(gnus-backend-trace :finishing gnus-command-method)
(prog1
(funcall (gnus-get-function gnus-command-method
'finish-retrieve-group-infos)
(nth 1 gnus-command-method)
infos data)
(gnus-backend-trace :finished gnus-command-method))))
(defun gnus-retrieve-group-data-early (command-method infos)
"Start early async retrieval of data from COMMAND-METHOD."
(let ((gnus-command-method
(if (stringp command-method)
(gnus-server-to-method command-method)
command-method)))
(funcall (gnus-get-function gnus-command-method 'retrieve-group-data-early)
(nth 1 gnus-command-method)
infos)))
(defun gnus-request-list-newsgroups (command-method)
"Request the newsgroups file from COMMAND-METHOD."
(let ((gnus-command-method
(if (stringp command-method)
(gnus-server-to-method command-method)
command-method)))
(funcall (gnus-get-function gnus-command-method 'request-list-newsgroups)
(nth 1 gnus-command-method))))
(defun gnus-request-newgroups (date command-method)
"Request all new groups since DATE from COMMAND-METHOD."
(let ((gnus-command-method
(if (stringp command-method)
(gnus-server-to-method command-method)
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-request-regenerate (command-method)
"Request a data generation from COMMAND-METHOD."
(let ((gnus-command-method
(if (stringp command-method)
(gnus-server-to-method command-method)
command-method)))
(funcall (gnus-get-function gnus-command-method 'request-regenerate)
(nth 1 gnus-command-method))))
(defun gnus-request-compact-group (group)
(let* ((method (gnus-find-method-for-group group))
(gnus-command-method method)
(result
(funcall (gnus-get-function gnus-command-method
'request-compact-group)
(gnus-group-real-name group)
(nth 1 gnus-command-method) t)))
result))
(defun gnus-request-compact (command-method)
"Request groups compaction from COMMAND-METHOD."
(let ((gnus-command-method
(if (stringp command-method)
(gnus-server-to-method command-method)
command-method)))
(funcall (gnus-get-function gnus-command-method 'request-compact)
(nth 1 gnus-command-method))))
(defun gnus-request-group (group &optional dont-check command-method info)
"Request GROUP. If DONT-CHECK, no information is required."
(let ((gnus-command-method
(or 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
info)))
(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-request-group-scan (group info)
"Request that GROUP get a complete rescan."
(let ((gnus-command-method (gnus-find-method-for-group group))
(func 'request-group-scan))
(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) info))))
(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)))
(cond
((and gnus-use-cache (numberp (car articles)))
(gnus-cache-retrieve-headers articles group fetch-old))
((and gnus-agent (gnus-online gnus-command-method)
(gnus-agent-method-p gnus-command-method))
(gnus-agent-retrieve-headers articles group fetch-old))
(t
(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 command-method)
"Request active information on GROUPS from COMMAND-METHOD."
(let ((gnus-command-method
(if (stringp command-method)
(gnus-server-to-method command-method)
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-group-status (group status)
"Change the status of a group.
Valid statuses include `subscribe' and `unsubscribe'."
(let ((gnus-command-method (gnus-find-method-for-group group)))
(if (not (gnus-check-backend-function
'request-update-group-status (car gnus-command-method)))
nil
(funcall
(gnus-get-function gnus-command-method 'request-update-group-status)
(gnus-group-real-name group) status
(nth 1 gnus-command-method)))))
(defun gnus-request-set-mark (group action)
"Set marks on articles in the back end."
(let ((gnus-command-method (gnus-find-method-for-group group)))
(if (not (gnus-check-backend-function
'request-set-mark (car gnus-command-method)))
action
(funcall (gnus-get-function gnus-command-method 'request-set-mark)
(gnus-group-real-name group) action
(nth 1 gnus-command-method))
(gnus-run-hook-with-args gnus-after-set-mark-hook group action))))
(defun gnus-request-update-mark (group article mark)
"Allow the back end 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
(gnus-run-hook-with-args gnus-before-update-mark-hook group article 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-thread (header group)
"Request the headers in the thread containing the article specified by HEADER."
(let ((gnus-command-method (gnus-find-method-for-group group)))
(funcall (gnus-get-function gnus-command-method 'request-thread)
header
(gnus-group-real-name group))))
(defun gnus-select-group-with-message-id (group message-id)
"Activate and select GROUP with the given MESSAGE-ID selected.
Returns the article number of the message.
If GROUP is not already selected, the message will be the only one in
the group's summary."
;; TODO: is there a way to know at this point whether the group will
;; be newly-selected? If so we could clean up the logic at the end
;;
;; save the new group's display parameter, if any, so we
;; can replace it temporarily with zero.
(let ((saved-display
(gnus-group-get-parameter group 'display :allow-list)))
;; Tell gnus we really don't want any articles
(gnus-group-set-parameter group 'display 0)
(unwind-protect
(gnus-summary-read-group-1
group (not :show-all) :no-article (not :kill-buffer)
;; The combination of no-display and this dummy list of
;; articles to select somehow makes it possible to open a
;; group with no articles in it. Black magic.
:no-display '(-1); select-articles
)
;; Restore the new group's display parameter
(gnus-group-set-parameter group 'display saved-display)))
;; The summary buffer was suppressed by :no-display above.
;; Create it now and insert the message
(let ((group-is-new (gnus-summary-setup-buffer group)))
(condition-case err
(let ((article-number
(gnus-summary-insert-subject message-id)))
(unless article-number
(signal 'error "message-id not in group"))
(gnus-summary-select-article nil nil nil article-number)
article-number)
;; Clean up the new summary and propagate the error
(error (when group-is-new (gnus-summary-exit))
(apply #'signal err)))))
(defun gnus-simplify-group-name (group)
"Return the simplest representation of the name of GROUP.
This is the string that Gnus uses to identify the group."
(gnus-group-prefixed-name
(gnus-group-real-name group)
(gnus-group-method group)))
(defun gnus-warp-to-article ()
"Look up the current article in the group where it originated.
This command only makes sense for groups shows articles gathered
from other groups -- for instance, search results and the like."
(interactive nil gnus-summary-mode)
(let ((gnus-command-method
(gnus-find-method-for-group gnus-newsgroup-name)))
(or
(when (gnus-check-backend-function
'warp-to-article (car gnus-command-method))
(funcall (gnus-get-function gnus-command-method 'warp-to-article)))
(and (bound-and-true-p gnus-registry-enabled)
(gnus-try-warping-via-registry)))))
(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))
;; Check the agent cache.
((gnus-agent-request-article article group)
(setq res (cons group article)
clean-up t))
;; Use `head' function.
((fboundp head)
(setq res (funcall head article
(and (not gnus-override-method) (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
(with-current-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))
;; Check the agent cache.
((gnus-agent-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
(with-current-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 (command-method)
"Post the current buffer using COMMAND-METHOD."
(let ((gnus-command-method
(if (stringp command-method)
(gnus-server-to-method command-method)
command-method)))
(funcall (gnus-get-function gnus-command-method 'request-post)
(nth 1 gnus-command-method))))
(defun gnus-request-expunge-group (group command-method)
"Expunge GROUP, which is removing articles that have been marked as deleted."
(let ((gnus-command-method
(if (stringp command-method)
(gnus-server-to-method command-method)
command-method)))
(funcall (gnus-get-function gnus-command-method 'request-expunge-group)
(gnus-group-real-name group)
(nth 1 gnus-command-method))))
(defvar mail-source-plugged)
(defvar gnus-inhibit-demon)
(defun gnus-request-scan (group command-method)
"Request a SCAN being performed in GROUP from COMMAND-METHOD.
If GROUP is nil, all groups on COMMAND-METHOD are scanned."
(let ((gnus-command-method
(if group (gnus-find-method-for-group group) command-method))
(gnus-inhibit-demon t)
(mail-source-plugged gnus-plugged))
(when (or gnus-plugged
(not (gnus-agent-method-p gnus-command-method)))
(setq gnus-internal-registry-spool-current-method gnus-command-method)
(funcall (gnus-get-function gnus-command-method 'request-scan)
(and group (gnus-group-real-name group))
(nth 1 gnus-command-method)))))
(defun gnus-request-update-info (info command-method)
(when (gnus-check-backend-function
'request-update-info (car command-method))
(let ((gnus-command-method
(if (stringp command-method)
(gnus-server-to-method command-method)
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)))))
(defsubst gnus-request-marks (info command-method)
"Request that COMMAND-METHOD update INFO."
(let ((gnus-command-method
(if (stringp command-method)
(gnus-server-to-method command-method)
command-method)))
(when (gnus-check-backend-function
'request-marks (car gnus-command-method))
(let ((group (gnus-info-group info)))
(and (funcall (gnus-get-function gnus-command-method 'request-marks)
(gnus-group-real-name group)
info (nth 1 gnus-command-method))
;; If the minimum article number is greater than 1, then all
;; smaller article numbers are known not to exist; we'll
;; artificially add those to the 'read range.
(let* ((active (gnus-active group))
(min (car active)))
(when (> min 1)
(let* ((range (if (= min 2) 1 (cons 1 (1- min))))
(read (gnus-info-read info))
(new-read (range-concat read (list range))))
(setf (gnus-info-read info) new-read)))
info))))))
(defun gnus-request-expire-articles (articles group &optional force)
(let* ((gnus-command-method (gnus-find-method-for-group group))
;; Filter out any negative article numbers; they can't be
;; expired here.
(articles
(delq nil (mapcar (lambda (n) (and (>= n 0) n)) articles)))
(gnus-inhibit-demon t)
(not-deleted
(funcall
(gnus-get-function gnus-command-method 'request-expire-articles)
articles (gnus-group-real-name group) (nth 1 gnus-command-method)
force)))
(when (and gnus-agent
(gnus-agent-method-p gnus-command-method))
(let ((expired-articles (gnus-sorted-difference articles not-deleted)))
(when expired-articles
(gnus-agent-expire expired-articles group 'force))))
not-deleted))
(defun gnus-request-move-article (article group _server accept-function
&optional last move-is-internal)
(let* ((gnus-command-method (gnus-find-method-for-group group))
(result (funcall (gnus-get-function gnus-command-method
'request-move-article)
article (gnus-group-real-name group)
(nth 1 gnus-command-method) accept-function
last move-is-internal)))
(when (and result gnus-agent
(gnus-agent-method-p gnus-command-method))
(gnus-agent-unfetch-articles group (list article)))
result))
(defun gnus-request-accept-article (group &optional command-method last
no-encode)
(let ((gnus-command-method
(if (stringp command-method)
(gnus-server-to-method command-method)
command-method)))
(when (and (not gnus-command-method)
(stringp group))
(setq gnus-command-method (or (gnus-find-method-for-group group)
(gnus-group-name-to-method group))))
(goto-char (point-max))
;; Make sure there's a newline at the end of the article.
(unless (bolp)
(insert "\n"))
(unless no-encode
(let ((message-options message-options))
(message-options-set-recipient)
(save-restriction
(message-narrow-to-head)
(mail-encode-encoded-word-buffer))
(message-encode-message-body)))
(let ((gnus-command-method (or gnus-command-method
(gnus-find-method-for-group group)))
(result
(funcall
(gnus-get-function gnus-command-method 'request-accept-article)
(if (stringp group) (gnus-group-real-name group) group)
(cadr gnus-command-method)
last)))
(when (and gnus-agent
(gnus-agent-method-p gnus-command-method)
(cdr result))
(gnus-agent-regenerate-group group (list (cdr result))))
result)))
(defun gnus-request-replace-article (article group buffer &optional no-encode)
(unless no-encode
(let ((message-options message-options))
(message-options-set-recipient)
(save-restriction
(message-narrow-to-head)
(mail-encode-encoded-word-buffer))
(message-encode-message-body)))
(let* ((func (car (gnus-group-name-to-method group)))
(result (funcall (intern (format "%s-request-replace-article" func))
article (gnus-group-real-name group) buffer)))
(when (and gnus-agent (gnus-agent-method-p gnus-command-method))
(gnus-agent-regenerate-group group (list article)))
result))
(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 command-method args)
(let* ((gnus-command-method
(or (if (stringp command-method)
(gnus-server-to-method command-method)
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))
(result
(funcall (gnus-get-function gnus-command-method 'request-delete-group)
(gnus-group-real-name group) force (nth 1 gnus-command-method))))
(when result
(gnus-cache-delete-group group)
(gnus-agent-delete-group group))
result))
(defun gnus-request-rename-group (group new-name)
(let* ((gnus-command-method (gnus-find-method-for-group group))
(result
(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))))
(when result
(gnus-cache-rename-group group new-name)
(gnus-agent-rename-group group new-name))
result))
(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 (command-method)
(let ((func (gnus-get-function command-method 'asynchronous-p t)))
(when (fboundp func)
(let ((gnus-command-method command-method))
(funcall func)))))
(defun gnus-remove-denial (command-method)
(let* ((gnus-command-method
(if (stringp command-method)
(gnus-server-to-method command-method)
command-method))
(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
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