lisp/gnus/nnspool.el

   1 ;;; nnspool.el --- spool access for GNU Emacs
   2
   3 ;; Copyright (C) 1988-1990, 1993-1998, 2000-2015 Free Software
   4 ;; Foundation, Inc.
   5
   6 ;; Author: Masanobu UMEDA <umerin@flab.flab.fujitsu.junet>
   7 ;;      Lars Magne Ingebrigtsen <larsi@gnus.org>
   8 ;; Keywords: news
   9
  10 ;; This file is part of GNU Emacs.
  11
  12 ;; GNU Emacs is free software: you can redistribute it and/or modify
  13 ;; it under the terms of the GNU General Public License as published by
  14 ;; the Free Software Foundation, either version 3 of the License, or
  15 ;; (at your option) any later version.
  16
  17 ;; GNU Emacs is distributed in the hope that it will be useful,
  18 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 ;; GNU General Public License for more details.
  21
  22 ;; You should have received a copy of the GNU General Public License
  23 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  24
  25 ;;; Commentary:
  26
  27 ;;; Code:
  28
  29 (require 'nnheader)
  30 (require 'nntp)
  31 (require 'nnoo)
  32 (eval-when-compile (require 'cl))
  33
  34 ;; Probably this entire thing should be obsolete.
  35 ;; It's only used to init nnspool-spool-directory, so why not just
  36 ;; set that variable's default directly?
  37 (eval-and-compile
  38   (defvar news-directory (if (file-exists-p "/usr/spool/news/")
  39                              "/usr/spool/news/"
  40                            "/var/spool/news/")
  41     "The root directory below which all news files are stored.")
  42   (defvaralias 'news-path 'news-directory))
  43
  44 ;; Ditto re obsolescence.
  45 (defvar news-inews-program
  46   (cond ((file-exists-p "/usr/bin/inews") "/usr/bin/inews")
  47         ((file-exists-p "/usr/local/inews") "/usr/local/inews")
  48         ((file-exists-p "/usr/local/bin/inews") "/usr/local/bin/inews")
  49         ((file-exists-p "/usr/contrib/lib/news/inews") "/usr/contrib/lib/news/inews")
  50         ((file-exists-p "/usr/lib/news/inews") "/usr/lib/news/inews")
  51         (t "inews"))
  52   "Program to post news.")
  53
  54 (nnoo-declare nnspool)
  55
  56 (defvoo nnspool-inews-program news-inews-program
  57   "Program to post news.
  58 This is most commonly `inews' or `injnews'.")
  59
  60 (defvoo nnspool-inews-switches '("-h" "-S")
  61   "Switches for nnspool-request-post to pass to `inews' for posting news.
  62 If you are using Cnews, you probably should set this variable to nil.")
  63
  64 (defvoo nnspool-spool-directory
  65     (file-name-as-directory (if (boundp 'news-directory)
  66                                 (symbol-value 'news-directory)
  67                               news-path))
  68   "Local news spool directory.")
  69
  70 (defvoo nnspool-nov-directory (concat nnspool-spool-directory "over.view/")
  71   "Local news nov directory.")
  72
  73 (defvoo nnspool-lib-dir
  74     (if (file-exists-p "/usr/lib/news/active")
  75         "/usr/lib/news/"
  76       "/var/lib/news/")
  77   "Where the local news library files are stored.")
  78
  79 (defvoo nnspool-active-file (concat nnspool-lib-dir "active")
  80   "Local news active file.")
  81
  82 (defvoo nnspool-newsgroups-file (concat nnspool-lib-dir "newsgroups")
  83   "Local news newsgroups file.")
  84
  85 (defvoo nnspool-distributions-file (concat nnspool-lib-dir "distribs.pat")
  86   "Local news distributions file.")
  87
  88 (defvoo nnspool-history-file (concat nnspool-lib-dir "history")
  89   "Local news history file.")
  90
  91 (defvoo nnspool-active-times-file (concat nnspool-lib-dir "active.times")
  92   "Local news active date file.")
  93
  94 (defvoo nnspool-large-newsgroup 50
  95   "The number of articles which indicates a large newsgroup.
  96 If the number of articles is greater than the value, verbose
  97 messages will be shown to indicate the current status.")
  98
  99 (defvoo nnspool-nov-is-evil nil
 100   "Non-nil means that nnspool will never return NOV lines instead of headers.")
 101
 102 (defconst nnspool-sift-nov-with-sed nil
 103   "If non-nil, use sed to get the relevant portion from the overview file.
 104 If nil, nnspool will load the entire file into a buffer and process it
 105 there.")
 106
 107 (defvoo nnspool-rejected-article-hook nil
 108   "*A hook that will be run when an article has been rejected by the server.")
 109
 110 (defvoo nnspool-file-coding-system nnheader-file-coding-system
 111   "Coding system for nnspool.")
 112
 113 \f
 114
 115 (defconst nnspool-version "nnspool 2.0"
 116   "Version numbers of this version of NNSPOOL.")
 117
 118 (defvoo nnspool-current-directory nil
 119   "Current news group directory.")
 120
 121 (defvoo nnspool-current-group nil)
 122 (defvoo nnspool-status-string "")
 123
 124 \f
 125 ;;; Interface functions.
 126
 127 (nnoo-define-basics nnspool)
 128
 129 (deffoo nnspool-retrieve-headers (articles &optional group server fetch-old)
 130   "Retrieve the headers of ARTICLES."
 131   (with-current-buffer nntp-server-buffer
 132     (erase-buffer)
 133     (when (nnspool-possibly-change-directory group)
 134       (let* ((number (length articles))
 135              (count 0)
 136              (default-directory nnspool-current-directory)
 137              (do-message (and (numberp nnspool-large-newsgroup)
 138                               (> number nnspool-large-newsgroup)))
 139              (nnheader-file-coding-system nnspool-file-coding-system)
 140              file beg article ag)
 141         (if (and (numberp (car articles))
 142                  (nnspool-retrieve-headers-with-nov articles fetch-old))
 143             ;; We successfully retrieved the NOV headers.
 144             'nov
 145           ;; No NOV headers here, so we do it the hard way.
 146           (while (setq article (pop articles))
 147             (if (stringp article)
 148                 ;; This is a Message-ID.
 149                 (setq ag (nnspool-find-id article)
 150                       file (and ag (nnspool-article-pathname
 151                                     (car ag) (cdr ag)))
 152                       article (cdr ag))
 153               ;; This is an article in the current group.
 154               (setq file (int-to-string article)))
 155             ;; Insert the head of the article.
 156             (when (and file
 157                        (file-exists-p file))
 158               (insert "221 ")
 159               (princ article (current-buffer))
 160               (insert " Article retrieved.\n")
 161               (setq beg (point))
 162               (inline (nnheader-insert-head file))
 163               (goto-char beg)
 164               (if (search-forward "\n\n" nil t)
 165                   (progn
 166                     (forward-char -1)
 167                     (insert ".\n"))
 168                 (goto-char (point-max))
 169                 (if (bolp)
 170                     (insert ".\n")
 171                   (insert "\n.\n")))
 172               (delete-region (point) (point-max)))
 173
 174             (and do-message
 175                  (zerop (% (incf count) 20))
 176                  (nnheader-message 5 "nnspool: Receiving headers... %d%%"
 177                                    (floor (* count 100.0) number))))
 178
 179           (when do-message
 180             (nnheader-message 5 "nnspool: Receiving headers...done"))
 181
 182           ;; Fold continuation lines.
 183           (nnheader-fold-continuation-lines)
 184           'headers)))))
 185
 186 (deffoo nnspool-open-server (server &optional defs)
 187   (nnoo-change-server 'nnspool server defs)
 188   (cond
 189    ((not (file-exists-p nnspool-spool-directory))
 190     (nnspool-close-server)
 191     (nnheader-report 'nnspool "Spool directory doesn't exist: %s"
 192                      nnspool-spool-directory))
 193    ((not (file-directory-p
 194           (directory-file-name
 195            (file-truename nnspool-spool-directory))))
 196     (nnspool-close-server)
 197     (nnheader-report 'nnspool "Not a directory: %s" nnspool-spool-directory))
 198    ((not (file-exists-p nnspool-active-file))
 199     (nnheader-report 'nnspool "The active file doesn't exist: %s"
 200                      nnspool-active-file))
 201    (t
 202     (nnheader-report 'nnspool "Opened server %s using directory %s"
 203                      server nnspool-spool-directory)
 204     t)))
 205
 206 (deffoo nnspool-request-article (id &optional group server buffer)
 207   "Select article by message ID (or number)."
 208   (nnspool-possibly-change-directory group)
 209   (let ((nntp-server-buffer (or buffer nntp-server-buffer))
 210         file ag)
 211     (if (stringp id)
 212         ;; This is a Message-ID.
 213         (when (setq ag (nnspool-find-id id))
 214           (setq file (nnspool-article-pathname (car ag) (cdr ag))))
 215       (setq file (nnspool-article-pathname nnspool-current-group id)))
 216     (and file
 217          (file-exists-p file)
 218          (not (file-directory-p file))
 219          (save-excursion (nnspool-find-file file))
 220          ;; We return the article number and group name.
 221          (if (numberp id)
 222              (cons nnspool-current-group id)
 223            ag))))
 224
 225 (deffoo nnspool-request-body (id &optional group server)
 226   "Select article body by message ID (or number)."
 227   (nnspool-possibly-change-directory group)
 228   (let ((res (nnspool-request-article id)))
 229     (when res
 230       (with-current-buffer nntp-server-buffer
 231         (goto-char (point-min))
 232         (when (search-forward "\n\n" nil t)
 233           (delete-region (point-min) (point)))
 234         res))))
 235
 236 (deffoo nnspool-request-head (id &optional group server)
 237   "Select article head by message ID (or number)."
 238   (nnspool-possibly-change-directory group)
 239   (let ((res (nnspool-request-article id)))
 240     (when res
 241       (with-current-buffer nntp-server-buffer
 242         (goto-char (point-min))
 243         (when (search-forward "\n\n" nil t)
 244           (delete-region (1- (point)) (point-max)))
 245         (nnheader-fold-continuation-lines)))
 246     res))
 247
 248 (deffoo nnspool-request-group (group &optional server dont-check info)
 249   "Select news GROUP."
 250   (let ((pathname (nnspool-article-pathname group))
 251         dir)
 252     (if (not (file-directory-p pathname))
 253         (nnheader-report
 254          'nnspool "Invalid group name (no such directory): %s" group)
 255       (setq nnspool-current-directory pathname)
 256       (nnheader-report 'nnspool "Selected group %s" group)
 257       (if dont-check
 258           (progn
 259             (nnheader-report 'nnspool "Selected group %s" group)
 260             t)
 261         ;; Yes, completely empty spool directories *are* possible.
 262         ;; Fix by Sudish Joseph <joseph@cis.ohio-state.edu>
 263         (when (setq dir (directory-files pathname nil "^[0-9]+$" t))
 264           (setq dir (sort (mapcar 'string-to-number dir) '<)))
 265         (if dir
 266             (nnheader-insert
 267              "211 %d %d %d %s\n" (length dir) (car dir)
 268              (car (last dir)) group)
 269           (nnheader-report 'nnspool "Empty group %s" group)
 270           (nnheader-insert "211 0 0 0 %s\n" group))))))
 271
 272 (deffoo nnspool-request-type (group &optional article)
 273   'news)
 274
 275 (deffoo nnspool-close-group (group &optional server)
 276   t)
 277
 278 (deffoo nnspool-request-list (&optional server)
 279   "List active newsgroups."
 280   (save-excursion
 281     (or (nnspool-find-file nnspool-active-file)
 282         (nnheader-report 'nnspool (nnheader-file-error nnspool-active-file)))))
 283
 284 (deffoo nnspool-request-list-newsgroups (&optional server)
 285   "List newsgroups (defined in NNTP2)."
 286   (save-excursion
 287     (or (nnspool-find-file nnspool-newsgroups-file)
 288         (nnheader-report 'nnspool (nnheader-file-error
 289                                    nnspool-newsgroups-file)))))
 290
 291 (deffoo nnspool-request-list-distributions (&optional server)
 292   "List distributions (defined in NNTP2)."
 293   (save-excursion
 294     (or (nnspool-find-file nnspool-distributions-file)
 295         (nnheader-report 'nnspool (nnheader-file-error
 296                                    nnspool-distributions-file)))))
 297
 298 ;; Suggested by Hallvard B Furuseth <h.b.furuseth@usit.uio.no>.
 299 (deffoo nnspool-request-newgroups (date &optional server)
 300   "List groups created after DATE."
 301   (if (nnspool-find-file nnspool-active-times-file)
 302       (save-excursion
 303         ;; Find the last valid line.
 304         (goto-char (point-max))
 305         (while (and (not (looking-at
 306                           "\\([^ ]+\\) +\\([0-9]+\\)[0-9][0-9][0-9] "))
 307                     (zerop (forward-line -1))))
 308         ;; We require nnheader which requires gnus-util.
 309         (let ((seconds (gnus-float-time (date-to-time date)))
 310               groups)
 311           ;; Go through lines and add the latest groups to a list.
 312           (while (and (looking-at "\\([^ ]+\\) +[0-9]+ ")
 313                       (progn
 314                         ;; We insert a .0 to make the list reader
 315                         ;; interpret the number as a float.  It is far
 316                         ;; too big to be stored in a lisp integer.
 317                         (goto-char (1- (match-end 0)))
 318                         (insert ".0")
 319                         (> (progn
 320                              (goto-char (match-end 1))
 321                              (read (current-buffer)))
 322                            seconds))
 323                       (push (buffer-substring
 324                              (match-beginning 1) (match-end 1))
 325                             groups)
 326                       (zerop (forward-line -1))))
 327           (erase-buffer)
 328           (dolist (group groups)
 329             (insert group " 0 0 y\n")))
 330         t)
 331     nil))
 332
 333 (deffoo nnspool-request-post (&optional server)
 334   "Post a new news in current buffer."
 335   (save-excursion
 336     (let* ((process-connection-type nil) ; t bugs out on Solaris
 337            (inews-buffer (generate-new-buffer " *nnspool post*"))
 338            (proc
 339             (condition-case err
 340                 (apply 'start-process "*nnspool inews*" inews-buffer
 341                        nnspool-inews-program nnspool-inews-switches)
 342               (error
 343                (nnheader-report 'nnspool "inews error: %S" err)))))
 344       (if (not proc)
 345           ;; The inews program failed.
 346           ()
 347         (nnheader-report 'nnspool "")
 348         (set-process-sentinel proc 'nnspool-inews-sentinel)
 349         (mm-with-unibyte-current-buffer
 350           (process-send-region proc (point-min) (point-max)))
 351         ;; We slap a condition-case around this, because the process may
 352         ;; have exited already...
 353         (ignore-errors
 354           (process-send-eof proc))
 355         t))))
 356
 357
 358 \f
 359 ;;; Internal functions.
 360
 361 (defun nnspool-inews-sentinel (proc status)
 362   (with-current-buffer (process-buffer proc)
 363     (goto-char (point-min))
 364     (if (or (zerop (buffer-size))
 365             (search-forward "spooled" nil t))
 366         (kill-buffer (current-buffer))
 367       ;; Make status message by folding lines.
 368       (while (re-search-forward "[ \t\n]+" nil t)
 369         (replace-match " " t t))
 370       (nnheader-report 'nnspool "%s" (buffer-string))
 371       (nnheader-message 5 "nnspool: %s" nnspool-status-string)
 372       (ding)
 373       (run-hooks 'nnspool-rejected-article-hook))))
 374
 375 (defun nnspool-retrieve-headers-with-nov (articles &optional fetch-old)
 376   (if (or gnus-nov-is-evil nnspool-nov-is-evil)
 377       nil
 378     (let ((nov (nnheader-group-pathname
 379                 nnspool-current-group nnspool-nov-directory ".overview"))
 380           (arts articles)
 381           (nnheader-file-coding-system nnspool-file-coding-system)
 382           last)
 383       (if (not (file-exists-p nov))
 384           ()
 385         (with-current-buffer nntp-server-buffer
 386           (erase-buffer)
 387           (if nnspool-sift-nov-with-sed
 388               (nnspool-sift-nov-with-sed articles nov)
 389             (nnheader-insert-file-contents nov)
 390             (if (and fetch-old
 391                      (not (numberp fetch-old)))
 392                 t                       ; We want all the headers.
 393               (ignore-errors
 394                 ;; Delete unwanted NOV lines.
 395                 (nnheader-nov-delete-outside-range
 396                  (if fetch-old (max 1 (- (car articles) fetch-old))
 397                    (car articles))
 398                  (car (last articles)))
 399                 ;; If the buffer is empty, this wasn't very successful.
 400                 (unless (zerop (buffer-size))
 401                   ;; We check what the last article number was.
 402                   ;; The NOV file may be out of sync with the articles
 403                   ;; in the group.
 404                   (forward-line -1)
 405                   (setq last (read (current-buffer)))
 406                   (if (= last (car articles))
 407                       ;; Yup, it's all there.
 408                       t
 409                     ;; Perhaps not.  We try to find the missing articles.
 410                     (while (and arts
 411                                 (<= last (car arts)))
 412                       (pop arts))
 413                     ;; The articles in `arts' are missing from the buffer.
 414                     (mapc 'nnspool-insert-nov-head arts)
 415                     t))))))))))
 416
 417 (defun nnspool-insert-nov-head (article)
 418   "Read the head of ARTICLE, convert to NOV headers, and insert."
 419   (save-excursion
 420     (let ((cur (current-buffer))
 421           buf)
 422       (setq buf (nnheader-set-temp-buffer " *nnspool head*"))
 423       (when (nnheader-insert-head
 424              (nnspool-article-pathname nnspool-current-group article))
 425         (nnheader-insert-article-line article)
 426         (goto-char (point-min))
 427         (let ((headers (nnheader-parse-head)))
 428           (set-buffer cur)
 429           (goto-char (point-max))
 430           (nnheader-insert-nov headers)))
 431       (kill-buffer buf))))
 432
 433 (defun nnspool-sift-nov-with-sed (articles file)
 434   (let ((first (car articles))
 435         (last (car (last articles))))
 436     (call-process "awk" nil t nil
 437                   (format "BEGIN {firstmsg=%d; lastmsg=%d;}\n $1 >= firstmsg && $1 <= lastmsg {print;}"
 438                           (1- first) (1+ last))
 439                   file)))
 440
 441 ;; Fixed by fdc@cliwe.ping.de (Frank D. Cringle).
 442 ;; Find out what group an article identified by a Message-ID is in.
 443 (defun nnspool-find-id (id)
 444   (with-temp-buffer
 445     (ignore-errors
 446       (call-process "grep" nil t nil (regexp-quote id) nnspool-history-file))
 447     (goto-char (point-min))
 448     (when (looking-at "<[^>]+>[ \t]+[-0-9~]+[ \t]+\\([^ /\t\n]+\\)/\\([0-9]+\\)[ \t\n]")
 449       (cons (match-string 1) (string-to-number (match-string 2))))))
 450
 451 (defun nnspool-find-file (file)
 452   "Insert FILE in server buffer safely."
 453   (set-buffer nntp-server-buffer)
 454   (erase-buffer)
 455   (condition-case ()
 456       (let ((coding-system-for-read nnspool-file-coding-system))
 457         (mm-insert-file-contents file)
 458         t)
 459     (file-error nil)))
 460
 461 (defun nnspool-possibly-change-directory (group)
 462   (if (not group)
 463       t
 464     (let ((pathname (nnspool-article-pathname group)))
 465       (if (file-directory-p pathname)
 466           (setq nnspool-current-directory pathname
 467                 nnspool-current-group group)
 468         (nnheader-report 'nnspool "No such newsgroup: %s" group)))))
 469
 470 (defun nnspool-article-pathname (group &optional article)
 471   "Find the file name for GROUP."
 472   (nnheader-group-pathname group nnspool-spool-directory article))
 473
 474 (provide 'nnspool)
 475
 476 ;;; nnspool.el ends here