gnus-util.el 72 KB
Newer Older
Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
1
;;; gnus-util.el --- utility functions for Gnus
2

3
;; Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
Glenn Morris's avatar
Glenn Morris committed
4
;;   2005, 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
5

6
;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
7 8 9 10
;; Keywords: news

;; This file is part of GNU Emacs.

11
;; GNU Emacs is free software: you can redistribute it and/or modify
Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
12
;; it under the terms of the GNU General Public License as published by
13 14
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
15 16 17

;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
18
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
19 20 21
;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
22
;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
23 24 25 26 27 28 29 30

;;; Commentary:

;; Nothing in this file depends on any other parts of Gnus -- all
;; functions and macros in this file are utility functions that are
;; used by Gnus and may be used by any other package without loading
;; Gnus first.

31
;; [Unfortunately, it does depend on other parts of Gnus, e.g. the
32
;; autoloads and defvars below...]
33

Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
34 35
;;; Code:

36
;; For Emacs <22.2 and XEmacs.
37 38
(eval-and-compile
  (unless (fboundp 'declare-function) (defmacro declare-function (&rest r))))
39
(eval-when-compile
Dan Nicolaescu's avatar
Dan Nicolaescu committed
40
  (require 'cl))
41

42 43
(defcustom gnus-completing-read-function 'gnus-emacs-completing-read
  "Function use to do completing read."
44
  :version "24.1"
45
  :group 'gnus-meta
46
  :type `(radio (function-item
47 48
                 :doc "Use Emacs standard `completing-read' function."
                 gnus-emacs-completing-read)
49 50 51 52 53 54 55 56 57
		;; iswitchb.el is very old and ido.el is unavailable
		;; in XEmacs, so we exclude those function items.
		,@(unless (featurep 'xemacs)
		    '((function-item
		       :doc "Use `ido-completing-read' function."
		       gnus-ido-completing-read)
		      (function-item
		       :doc "Use iswitchb based completing-read function."
		       gnus-iswitchb-completing-read)))))
58 59 60 61 62 63 64 65 66 67 68 69 70 71

(defcustom gnus-completion-styles
  (if (and (boundp 'completion-styles-alist)
           (boundp 'completion-styles))
      (append (when (and (assq 'substring completion-styles-alist)
                         (not (memq 'substring completion-styles)))
                (list 'substring))
              completion-styles)
    nil)
  "Value of `completion-styles' to use when completing."
  :version "24.1"
  :group 'gnus-meta
  :type 'list)

Dan Nicolaescu's avatar
Dan Nicolaescu committed
72 73 74 75 76 77 78 79 80
;; Fixme: this should be a gnus variable, not nnmail-.
(defvar nnmail-pathname-coding-system)
(defvar nnmail-active-file-coding-system)

;; Inappropriate references to other parts of Gnus.
(defvar gnus-emphasize-whitespace-regexp)
(defvar gnus-original-article-buffer)
(defvar gnus-user-agent)

Glenn Morris's avatar
Glenn Morris committed
81 82 83
(autoload 'gnus-get-buffer-window "gnus-win")
(autoload 'nnheader-narrow-to-headers "nnheader")
(autoload 'nnheader-replace-chars-in-string "nnheader")
84
(autoload 'mail-header-remove-comments "mail-parse")
85 86 87

(eval-and-compile
  (cond
88
   ;; Prefer `replace-regexp-in-string' (present in Emacs, XEmacs 21.5,
Glenn Morris's avatar
Glenn Morris committed
89
   ;; SXEmacs 22.1.4) over `replace-in-string'.  The latter leads to inf-loops
90 91 92
   ;; on empty matches:
   ;;   (replace-in-string "foo" "/*$" "/")
   ;;   (replace-in-string "xe" "\\(x\\)?" "")
93
   ((fboundp 'replace-regexp-in-string)
94
    (defun gnus-replace-in-string  (string regexp newtext &optional literal)
95 96 97 98 99
      "Replace all matches for REGEXP with NEWTEXT in STRING.
If LITERAL is non-nil, insert NEWTEXT literally.  Return a new
string containing the replacements.

This is a compatibility function for different Emacsen."
100
      (replace-regexp-in-string regexp newtext string nil literal)))
101
   ((fboundp 'replace-in-string)
102
    (defalias 'gnus-replace-in-string 'replace-in-string))))
Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
103 104 105 106 107 108 109 110 111

(defun gnus-boundp (variable)
  "Return non-nil if VARIABLE is bound and non-nil."
  (and (boundp variable)
       (symbol-value variable)))

(defmacro gnus-eval-in-buffer-window (buffer &rest forms)
  "Pop to BUFFER, evaluate FORMS, and then return to the original window."
  (let ((tempvar (make-symbol "GnusStartBufferWindow"))
112 113
	(w (make-symbol "w"))
	(buf (make-symbol "buf")))
Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
114
    `(let* ((,tempvar (selected-window))
115 116
	    (,buf ,buffer)
	    (,w (gnus-get-buffer-window ,buf 'visible)))
Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
117
       (unwind-protect
118 119 120 121 122 123 124 125
	   (progn
	     (if ,w
		 (progn
		   (select-window ,w)
		   (set-buffer (window-buffer ,w)))
	       (pop-to-buffer ,buf))
	     ,@forms)
	 (select-window ,tempvar)))))
Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
126 127 128 129 130

(put 'gnus-eval-in-buffer-window 'lisp-indent-function 1)
(put 'gnus-eval-in-buffer-window 'edebug-form-spec '(form body))

(defmacro gnus-intern-safe (string hashtable)
Miles Bader's avatar
Miles Bader committed
131
  "Get hash value.  Arguments are STRING and HASHTABLE."
Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
132 133 134 135 136 137 138 139 140 141 142 143 144 145
  `(let ((symbol (intern ,string ,hashtable)))
     (or (boundp symbol)
	 (set symbol nil))
     symbol))

(defsubst gnus-goto-char (point)
  (and point (goto-char point)))

(defmacro gnus-buffer-exists-p (buffer)
  `(let ((buffer ,buffer))
     (when buffer
       (funcall (if (stringp buffer) 'get-buffer 'buffer-name)
		buffer))))

146 147 148 149
;; The LOCAL arg to `add-hook' is interpreted differently in Emacs and
;; XEmacs.  In Emacs we don't need to call `make-local-hook' first.
;; It's harmless, though, so the main purpose of this alias is to shut
;; up the byte compiler.
150 151
(defalias 'gnus-make-local-hook (if (featurep 'xemacs)
                                    'make-local-hook
Glenn Morris's avatar
Glenn Morris committed
152
                                  'ignore))
153

Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
154 155 156 157 158 159 160 161 162 163 164 165 166 167
(defun gnus-delete-first (elt list)
  "Delete by side effect the first occurrence of ELT as a member of LIST."
  (if (equal (car list) elt)
      (cdr list)
    (let ((total list))
      (while (and (cdr list)
		  (not (equal (cadr list) elt)))
	(setq list (cdr list)))
      (when (cdr list)
	(setcdr list (cddr list)))
      total)))

;; Delete the current line (and the next N lines).
(defmacro gnus-delete-line (&optional n)
168
  `(delete-region (point-at-bol)
Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
169 170 171 172
		  (progn (forward-line ,(or n 1)) (point))))

(defun gnus-byte-code (func)
  "Return a form that can be `eval'ed based on FUNC."
173 174
  (let ((fval (indirect-function func)))
    (if (byte-code-function-p fval)
Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
175 176 177 178 179 180
	(let ((flist (append fval nil)))
	  (setcar flist 'byte-code)
	  flist)
      (cons 'progn (cddr fval)))))

(defun gnus-extract-address-components (from)
181 182 183 184 185
  "Extract address components from a From header.
Given an RFC-822 address FROM, extract full name and canonical address.
Returns a list of the form (FULL-NAME CANONICAL-ADDRESS).  Much more simple
solution than `mail-extract-address-components', which works much better, but
is slower."
Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
186 187 188 189
  (let (name address)
    ;; First find the address - the thing with the @ in it.  This may
    ;; not be accurate in mail addresses, but does the trick most of
    ;; the time in news messages.
Miles Bader's avatar
Miles Bader committed
190 191 192 193 194 195 196
    (cond (;; Check ``<foo@bar>'' first in order to handle the quite common
	   ;; form ``"abc@xyz" <foo@bar>'' (i.e. ``@'' as part of a comment)
	   ;; correctly.
	   (string-match "<\\([^@ \t<>]+[!@][^@ \t<>]+\\)>" from)
	   (setq address (substring from (match-beginning 1) (match-end 1))))
	  ((string-match "\\b[^@ \t<>]+[!@][^@ \t<>]+\\b" from)
	   (setq address (substring from (match-beginning 0) (match-end 0)))))
Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
197 198 199 200 201 202
    ;; Then we check whether the "name <address>" format is used.
    (and address
	 ;; Linear white space is not required.
	 (string-match (concat "[ \t]*<" (regexp-quote address) ">") from)
	 (and (setq name (substring from 0 (match-beginning 0)))
	      ;; Strip any quotes from the name.
203
	      (string-match "^\".*\"$" name)
Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
204 205 206 207 208 209 210 211 212 213 214 215
	      (setq name (substring name 1 (1- (match-end 0))))))
    ;; If not, then "address (name)" is used.
    (or name
	(and (string-match "(.+)" from)
	     (setq name (substring from (1+ (match-beginning 0))
				   (1- (match-end 0)))))
	(and (string-match "()" from)
	     (setq name address))
	;; XOVER might not support folded From headers.
	(and (string-match "(.*" from)
	     (setq name (substring from (1+ (match-beginning 0))
				   (match-end 0)))))
216 217
    (list (if (string= name "") nil name) (or address from))))

Miles Bader's avatar
Miles Bader committed
218 219 220 221 222 223 224 225 226
(defun gnus-extract-address-component-name (from)
  "Extract name from a From header.
Uses `gnus-extract-address-components'."
  (nth 0 (gnus-extract-address-components from)))

(defun gnus-extract-address-component-email (from)
  "Extract e-mail address from a From header.
Uses `gnus-extract-address-components'."
  (nth 1 (gnus-extract-address-components from)))
Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
227

228 229
(declare-function message-fetch-field "message" (header &optional not-all))

Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
230 231
(defun gnus-fetch-field (field)
  "Return the value of the header FIELD of current article."
232
  (require 'message)
Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
233 234
  (save-excursion
    (save-restriction
235
      (let ((inhibit-point-motion-hooks t))
Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
236 237 238
	(nnheader-narrow-to-headers)
	(message-fetch-field field)))))

239 240 241 242 243 244
(defun gnus-fetch-original-field (field)
  "Fetch FIELD from the original version of the current article."
  (with-current-buffer gnus-original-article-buffer
    (gnus-fetch-field field)))


Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
245 246
(defun gnus-goto-colon ()
  (beginning-of-line)
247
  (let ((eol (point-at-eol)))
248 249 250 251
    (goto-char (or (text-property-any (point) eol 'gnus-position t)
		   (search-forward ":" eol t)
		   (point)))))

252
(declare-function gnus-find-method-for-group "gnus" (group &optional info))
253
(declare-function gnus-group-name-decode "gnus-group" (string charset))
254 255 256 257 258
(declare-function gnus-group-name-charset "gnus-group" (method group))
;; gnus-group requires gnus-int which requires message.
(declare-function message-tokenize-header "message"
                  (header &optional separator))

259
(defun gnus-decode-newsgroups (newsgroups group &optional method)
260
  (require 'gnus-group)
261 262 263 264 265 266
  (let ((method (or method (gnus-find-method-for-group group))))
    (mapconcat (lambda (group)
		 (gnus-group-name-decode group (gnus-group-name-charset
						method group)))
	       (message-tokenize-header newsgroups)
	       ",")))
Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
267 268 269

(defun gnus-remove-text-with-property (prop)
  "Delete all text in the current buffer with text property PROP."
270 271 272 273 274 275 276 277 278
  (let ((start (point-min))
	end)
    (unless (get-text-property start prop)
      (setq start (next-single-property-change start prop)))
    (while start
      (setq end (text-property-any start (point-max) prop nil))
      (delete-region start (or end (point-max)))
      (setq start (when end
		    (next-single-property-change start prop))))))
Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
279

280 281 282 283 284 285 286 287 288 289 290
(defun gnus-find-text-property-region (start end prop)
  "Return a list of text property regions that has property PROP."
  (let (regions value)
    (unless (get-text-property start prop)
      (setq start (next-single-property-change start prop)))
    (while start
      (setq value (get-text-property start prop)
	    end (text-property-not-all start (point-max) prop value))
      (if (not end)
	  (setq start nil)
	(when value
291 292 293 294
	  (push (list (set-marker (make-marker) start)
		      (set-marker (make-marker) end)
		      value)
		regions))
295 296 297
	(setq start (next-single-property-change start prop))))
    (nreverse regions)))

Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
298 299
(defun gnus-newsgroup-directory-form (newsgroup)
  "Make hierarchical directory name from NEWSGROUP name."
300 301 302 303 304 305 306 307
  (let* ((newsgroup (gnus-newsgroup-savable-name newsgroup))
	 (idx (string-match ":" newsgroup)))
    (concat
     (if idx (substring newsgroup 0 idx))
     (if idx "/")
     (nnheader-replace-chars-in-string
      (if idx (substring newsgroup (1+ idx)) newsgroup)
      ?. ?/))))
Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
308 309 310 311 312 313 314 315 316 317

(defun gnus-newsgroup-savable-name (group)
  ;; Replace any slashes in a group name (eg. an ange-ftp nndoc group)
  ;; with dots.
  (nnheader-replace-chars-in-string group ?/ ?.))

(defun gnus-string> (s1 s2)
  (not (or (string< s1 s2)
	   (string= s1 s2))))

Miles Bader's avatar
Miles Bader committed
318 319 320 321 322 323 324 325 326
(defun gnus-string< (s1 s2)
  "Return t if first arg string is less than second in lexicographic order.
Case is significant if and only if `case-fold-search' is nil.
Symbols are also allowed; their print names are used instead."
  (if case-fold-search
      (string-lessp (downcase (if (symbolp s1) (symbol-name s1) s1))
		    (downcase (if (symbolp s2) (symbol-name s2) s2)))
    (string-lessp s1 s2)))

Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
327 328 329 330 331 332 333 334
;;; Time functions.

(defun gnus-file-newer-than (file date)
  (let ((fdate (nth 5 (file-attributes file))))
    (or (> (car fdate) (car date))
	(and (= (car fdate) (car date))
	     (> (nth 1 fdate) (nth 1 date))))))

335
(eval-and-compile
336 337 338
  (if (or (featurep 'emacs)
	  (and (fboundp 'float-time)
	       (subrp (symbol-function 'float-time))))
339 340 341
      (defalias 'gnus-float-time 'float-time)
    (defun gnus-float-time (&optional time)
      "Convert time value TIME to a floating point number.
342
TIME defaults to the current time."
343
      (time-to-seconds (or time (current-time))))))
344

Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390
;;; Keymap macros.

(defmacro gnus-local-set-keys (&rest plist)
  "Set the keys in PLIST in the current keymap."
  `(gnus-define-keys-1 (current-local-map) ',plist))

(defmacro gnus-define-keys (keymap &rest plist)
  "Define all keys in PLIST in KEYMAP."
  `(gnus-define-keys-1 (quote ,keymap) (quote ,plist)))

(defmacro gnus-define-keys-safe (keymap &rest plist)
  "Define all keys in PLIST in KEYMAP without overwriting previous definitions."
  `(gnus-define-keys-1 (quote ,keymap) (quote ,plist) t))

(put 'gnus-define-keys 'lisp-indent-function 1)
(put 'gnus-define-keys-safe 'lisp-indent-function 1)
(put 'gnus-local-set-keys 'lisp-indent-function 1)

(defmacro gnus-define-keymap (keymap &rest plist)
  "Define all keys in PLIST in KEYMAP."
  `(gnus-define-keys-1 ,keymap (quote ,plist)))

(put 'gnus-define-keymap 'lisp-indent-function 1)

(defun gnus-define-keys-1 (keymap plist &optional safe)
  (when (null keymap)
    (error "Can't set keys in a null keymap"))
  (cond ((symbolp keymap)
	 (setq keymap (symbol-value keymap)))
	((keymapp keymap))
	((listp keymap)
	 (set (car keymap) nil)
	 (define-prefix-command (car keymap))
	 (define-key (symbol-value (caddr keymap)) (cadr keymap) (car keymap))
	 (setq keymap (symbol-value (car keymap)))))
  (let (key)
    (while plist
      (when (symbolp (setq key (pop plist)))
	(setq key (symbol-value key)))
      (if (or (not safe)
	      (eq (lookup-key keymap key) 'undefined))
	  (define-key keymap key (pop plist))
	(pop plist)))))

;; Two silly functions to ensure that all `y-or-n-p' questions clear
;; the echo area.
Miles Bader's avatar
Miles Bader committed
391
;;
Miles Bader's avatar
Miles Bader committed
392 393
;; Do we really need these functions?  Workarounds for bugs in the corresponding
;; Emacs functions?  Maybe these bugs are no longer present in any supported
Miles Bader's avatar
Miles Bader committed
394
;; (X)Emacs version?  Alias them to the original functions and see if anyone
Miles Bader's avatar
Miles Bader committed
395 396
;; reports a problem.  If not, replace with original functions.  --rsteib,
;; 2007-12-14
Miles Bader's avatar
Miles Bader committed
397
;;
Miles Bader's avatar
Miles Bader committed
398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428
;; All supported Emacsen clear the echo area after `yes-or-no-p', so we can
;; remove `yes-or-no-p'.  RMS says that not clearing after `y-or-n-p' is
;; intentional (see below), so we could remove `gnus-y-or-n-p' too.
;; Objections?  --rsteib, 2008-02-16
;;
;; ,----[ http://thread.gmane.org/gmane.emacs.gnus.general/65099/focus=66070 ]
;; | From: Richard Stallman
;; | Subject: Re: Do we need gnus-yes-or-no-p and gnus-y-or-n-p?
;; | To: Katsumi Yamaoka [...]
;; | Cc: emacs-devel@[...], xemacs-beta@[...], ding@[...]
;; | Date: Mon, 07 Jan 2008 12:16:05 -0500
;; | Message-ID: <E1JBva1-000528-VY@fencepost.gnu.org>
;; |
;; |     The behavior of `y-or-n-p' that it doesn't clear the question
;; |     and the answer is not serious of course, but I feel it is not
;; |     cool.
;; |
;; | It is intentional.
;; |
;; |     Currently, it is commented out in the trunk by Reiner Steib.  He
;; |     also wrote the benefit of leaving the question and the answer in
;; |     the echo area as follows:
;; |
;; |     (http://article.gmane.org/gmane.emacs.gnus.general/66061)
;; |     > In contrast to yes-or-no-p it is much easier to type y, n,
;; |     > SPC, DEL, etc accidentally, so it might be useful for the user
;; |     > to see what he has typed.
;; |
;; | Yes, that is the reason.
;; `----

Miles Bader's avatar
Miles Bader committed
429 430 431 432 433 434 435 436 437 438 439
;; (defun gnus-y-or-n-p (prompt)
;;   (prog1
;;       (y-or-n-p prompt)
;;     (message "")))
;; (defun gnus-yes-or-no-p (prompt)
;;   (prog1
;;       (yes-or-no-p prompt)
;;     (message "")))

(defalias 'gnus-y-or-n-p 'y-or-n-p)
(defalias 'gnus-yes-or-no-p 'yes-or-no-p)
Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
440

441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463
;; By Frank Schmitt <ich@Frank-Schmitt.net>. Allows to have
;; age-depending date representations. (e.g. just the time if it's
;; from today, the day of the week if it's within the last 7 days and
;; the full date if it's older)

(defun gnus-seconds-today ()
  "Return the number of seconds passed today."
  (let ((now (decode-time (current-time))))
    (+ (car now) (* (car (cdr now)) 60) (* (car (nthcdr 2 now)) 3600))))

(defun gnus-seconds-month ()
  "Return the number of seconds passed this month."
  (let ((now (decode-time (current-time))))
    (+ (car now) (* (car (cdr now)) 60) (* (car (nthcdr 2 now)) 3600)
       (* (- (car (nthcdr 3 now)) 1) 3600 24))))

(defun gnus-seconds-year ()
  "Return the number of seconds passed this year."
  (let ((now (decode-time (current-time)))
	(days (format-time-string "%j" (current-time))))
    (+ (car now) (* (car (cdr now)) 60) (* (car (nthcdr 2 now)) 3600)
       (* (- (string-to-number days) 1) 3600 24))))

Romain Francoise's avatar
Romain Francoise committed
464 465 466 467 468 469 470 471 472 473 474 475 476 477
(defmacro gnus-date-get-time (date)
  "Convert DATE string to Emacs time.
Cache the result as a text property stored in DATE."
  ;; Either return the cached value...
  `(let ((d ,date))
     (if (equal "" d)
	 '(0 0)
       (or (get-text-property 0 'gnus-time d)
	   ;; or compute the value...
	   (let ((time (safe-date-to-time d)))
	     ;; and store it back in the string.
	     (put-text-property 0 1 'gnus-time time d)
	     time)))))

478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503
(defvar gnus-user-date-format-alist
  '(((gnus-seconds-today) . "%k:%M")
    (604800 . "%a %k:%M")                   ;;that's one week
    ((gnus-seconds-month) . "%a %d")
    ((gnus-seconds-year) . "%b %d")
    (t . "%b %d '%y"))                      ;;this one is used when no
					    ;;other does match
  "Specifies date format depending on age of article.
This is an alist of items (AGE . FORMAT).  AGE can be a number (of
seconds) or a Lisp expression evaluating to a number.  When the age of
the article is less than this number, then use `format-time-string'
with the corresponding FORMAT for displaying the date of the article.
If AGE is not a number or a Lisp expression evaluating to a
non-number, then the corresponding FORMAT is used as a default value.

Note that the list is processed from the beginning, so it should be
sorted by ascending AGE.  Also note that items following the first
non-number AGE will be ignored.

You can use the functions `gnus-seconds-today', `gnus-seconds-month'
and `gnus-seconds-year' in the AGE spec.  They return the number of
seconds passed since the start of today, of this month, of this year,
respectively.")

(defun gnus-user-date (messy-date)
  "Format the messy-date according to gnus-user-date-format-alist.
Katsumi Yamaoka's avatar
Katsumi Yamaoka committed
504
Returns \"  ?  \" if there's bad input or if another error occurs.
505 506
Input should look like this: \"Sun, 14 Oct 2001 13:34:39 +0200\"."
  (condition-case ()
Katsumi Yamaoka's avatar
Katsumi Yamaoka committed
507
      (let* ((messy-date (gnus-float-time (gnus-date-get-time messy-date)))
508
	     (now (gnus-float-time))
509 510 511 512 513 514 515 516 517 518 519 520 521 522
	     ;;If we don't find something suitable we'll use this one
	     (my-format "%b %d '%y"))
	(let* ((difference (- now messy-date))
	       (templist gnus-user-date-format-alist)
	       (top (eval (caar templist))))
	  (while (if (numberp top) (< top difference) (not top))
	    (progn
	      (setq templist (cdr templist))
	      (setq top (eval (caar templist)))))
	  (if (stringp (cdr (car templist)))
	      (setq my-format (cdr (car templist)))))
	(format-time-string (eval my-format) (seconds-to-time messy-date)))
    (error "  ?   ")))

Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
523
(defun gnus-dd-mmm (messy-date)
524
  "Return a string like DD-MMM from a big messy string."
525
  (condition-case ()
Katsumi Yamaoka's avatar
Katsumi Yamaoka committed
526
      (format-time-string "%d-%b" (gnus-date-get-time messy-date))
527
    (error "  -   ")))
Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
528 529

(defsubst gnus-time-iso8601 (time)
Dave Love's avatar
Dave Love committed
530
  "Return a string of TIME in YYYYMMDDTHHMMSS format."
Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
531 532
  (format-time-string "%Y%m%dT%H%M%S" time))

533
(defun gnus-date-iso8601 (date)
Dave Love's avatar
Dave Love committed
534
  "Convert the DATE to YYYYMMDDTHHMMSS."
Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
535
  (condition-case ()
536
      (gnus-time-iso8601 (gnus-date-get-time date))
Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
537 538 539 540
    (error "")))

(defun gnus-mode-string-quote (string)
  "Quote all \"%\"'s in STRING."
541
  (gnus-replace-in-string string "%" "%%"))
Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568

;; Make a hash table (default and minimum size is 256).
;; Optional argument HASHSIZE specifies the table size.
(defun gnus-make-hashtable (&optional hashsize)
  (make-vector (if hashsize (max (gnus-create-hash-size hashsize) 256) 256) 0))

;; Make a number that is suitable for hashing; bigger than MIN and
;; equal to some 2^x.  Many machines (such as sparcs) do not have a
;; hardware modulo operation, so they implement it in software.  On
;; many sparcs over 50% of the time to intern is spent in the modulo.
;; Yes, it's slower than actually computing the hash from the string!
;; So we use powers of 2 so people can optimize the modulo to a mask.
(defun gnus-create-hash-size (min)
  (let ((i 1))
    (while (< i min)
      (setq i (* 2 i)))
    i))

(defcustom gnus-verbose 7
  "*Integer that says how verbose Gnus should be.
The higher the number, the more messages Gnus will flash to say what
it's doing.  At zero, Gnus will be totally mute; at five, Gnus will
display most important messages; and at ten, Gnus will keep on
jabbering all the time."
  :group 'gnus-start
  :type 'integer)

569 570 571 572 573 574
(defcustom gnus-add-timestamp-to-message nil
  "Non-nil means add timestamps to messages that Gnus issues.
If it is `log', add timestamps to only the messages that go into the
\"*Messages*\" buffer (in XEmacs, it is the \" *Message-Log*\" buffer).
If it is neither nil nor `log', add timestamps not only to log messages
but also to the ones displayed in the echo area."
575
  :version "23.1" ;; No Gnus
576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635
  :group  'gnus-various
  :type '(choice :format "%{%t%}:\n %[Value Menu%] %v"
		 (const :tag "Logged messages only" log)
		 (sexp :tag "All messages"
		       :match (lambda (widget value) value)
		       :value t)
		 (const :tag "No timestamp" nil)))

(eval-when-compile
  (defmacro gnus-message-with-timestamp-1 (format-string args)
    (let ((timestamp '((format-time-string "%Y%m%dT%H%M%S" time)
		       "." (format "%03d" (/ (nth 2 time) 1000)) "> ")))
      (if (featurep 'xemacs)
	  `(let (str time)
	     (if (or (and (null ,format-string) (null ,args))
		     (progn
		       (setq str (apply 'format ,format-string ,args))
		       (zerop (length str))))
		 (prog1
		     (and ,format-string str)
		   (clear-message nil))
	       (cond ((eq gnus-add-timestamp-to-message 'log)
		      (setq time (current-time))
		      (display-message 'no-log str)
		      (log-message 'message (concat ,@timestamp str)))
		     (gnus-add-timestamp-to-message
		      (setq time (current-time))
		      (display-message 'message (concat ,@timestamp str)))
		     (t
		      (display-message 'message str))))
	     str)
	`(let (str time)
	   (cond ((eq gnus-add-timestamp-to-message 'log)
		  (setq str (let (message-log-max)
			      (apply 'message ,format-string ,args)))
		  (when (and message-log-max
			     (> message-log-max 0)
			     (/= (length str) 0))
		    (setq time (current-time))
		    (with-current-buffer (get-buffer-create "*Messages*")
		      (goto-char (point-max))
		      (insert ,@timestamp str "\n")
		      (forward-line (- message-log-max))
		      (delete-region (point-min) (point))
		      (goto-char (point-max))))
		  str)
		 (gnus-add-timestamp-to-message
		  (if (or (and (null ,format-string) (null ,args))
			  (progn
			    (setq str (apply 'format ,format-string ,args))
			    (zerop (length str))))
		      (prog1
			  (and ,format-string str)
			(message nil))
		    (setq time (current-time))
		    (message "%s" (concat ,@timestamp str))
		    str))
		 (t
		  (apply 'message ,format-string ,args))))))))

636 637
(defvar gnus-action-message-log nil)

638 639 640 641 642 643
(defun gnus-message-with-timestamp (format-string &rest args)
  "Display message with timestamp.  Arguments are the same as `message'.
The `gnus-add-timestamp-to-message' variable controls how to add
timestamp to message."
  (gnus-message-with-timestamp-1 format-string args))

Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
644
(defun gnus-message (level &rest args)
645 646 647 648 649 650
  "If LEVEL is lower than `gnus-verbose' print ARGS using `message'.

Guideline for numbers:
1 - error messages, 3 - non-serious error messages, 5 - messages for things
that take a long time, 7 - not very important messages on stuff, 9 - messages
inside loops."
Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
651
  (if (<= level gnus-verbose)
652 653 654 655 656 657 658 659
      (let ((message
	     (if gnus-add-timestamp-to-message
		 (apply 'gnus-message-with-timestamp args)
	       (apply 'message args))))
	(when (and (consp gnus-action-message-log)
		   (<= level 3))
	  (push message gnus-action-message-log))
	message)
Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
660 661 662 663 664
    ;; We have to do this format thingy here even if the result isn't
    ;; shown - the return value has to be the same as the return value
    ;; from `message'.
    (apply 'format args)))

665 666 667 668 669 670 671
(defun gnus-final-warning ()
  (when (and (consp gnus-action-message-log)
	     (setq gnus-action-message-log
		   (delete nil gnus-action-message-log)))
    (message "Warning: %s"
	     (mapconcat #'identity gnus-action-message-log "; "))))

Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
672
(defun gnus-error (level &rest args)
673 674
  "Beep an error if LEVEL is equal to or less than `gnus-verbose'.
ARGS are passed to `message'."
Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
675 676 677 678 679 680 681 682 683 684 685 686
  (when (<= (floor level) gnus-verbose)
    (apply 'message args)
    (ding)
    (let (duration)
      (when (and (floatp level)
		 (not (zerop (setq duration (* 10 (- level (floor level)))))))
	(sit-for duration))))
  nil)

(defun gnus-split-references (references)
  "Return a list of Message-IDs in REFERENCES."
  (let ((beg 0)
687
	(references (mail-header-remove-comments (or references "")))
Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
688
	ids)
689
    (while (string-match "<[^<]+[^< \t]" references beg)
Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
690 691 692 693
      (push (substring references (match-beginning 0) (setq beg (match-end 0)))
	    ids))
    (nreverse ids)))

694 695 696 697 698 699 700 701 702 703
(defun gnus-extract-references (references)
  "Return a list of Message-IDs in REFERENCES (in In-Reply-To
  format), trimmed to only contain the Message-IDs."
  (let ((ids (gnus-split-references references))
	refs)
    (dolist (id ids)
      (when (string-match "<[^<>]+>" id)
	(push (match-string 0 id) refs)))
    refs))

704
(defsubst gnus-parent-id (references &optional n)
Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
705 706
  "Return the last Message-ID in REFERENCES.
If N, return the Nth ancestor instead."
707 708 709 710 711 712 713
  (when (and references
	     (not (zerop (length references))))
    (if n
	(let ((ids (inline (gnus-split-references references))))
	  (while (nthcdr n ids)
	    (setq ids (cdr ids)))
	  (car ids))
714 715 716
      (let ((references (mail-header-remove-comments references)))
	(when (string-match "\\(<[^<]+>\\)[ \t]*\\'" references)
	  (match-string 1 references))))))
717 718

(defun gnus-buffer-live-p (buffer)
Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
719 720 721 722 723 724 725 726
  "Say whether BUFFER is alive or not."
  (and buffer
       (get-buffer buffer)
       (buffer-name (get-buffer buffer))))

(defun gnus-horizontal-recenter ()
  "Recenter the current buffer horizontally."
  (if (< (current-column) (/ (window-width) 2))
727
      (set-window-hscroll (gnus-get-buffer-window (current-buffer) t) 0)
Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
728
    (let* ((orig (point))
729
	   (end (window-end (gnus-get-buffer-window (current-buffer) t)))
Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
730
	   (max 0))
731 732 733 734 735 736 737 738 739 740 741 742
      (when end
	;; Find the longest line currently displayed in the window.
	(goto-char (window-start))
	(while (and (not (eobp))
		    (< (point) end))
	  (end-of-line)
	  (setq max (max max (current-column)))
	  (forward-line 1))
	(goto-char orig)
	;; Scroll horizontally to center (sort of) the point.
	(if (> max (window-width))
	    (set-window-hscroll
743
	     (gnus-get-buffer-window (current-buffer) t)
744 745
	     (min (- (current-column) (/ (window-width) 3))
		  (+ 2 (- max (window-width)))))
746
	  (set-window-hscroll (gnus-get-buffer-window (current-buffer) t) 0))
747
	max))))
Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
748

749
(defun gnus-read-event-char (&optional prompt)
Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
750
  "Get the next event."
751
  (let ((event (read-event prompt)))
Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
752 753 754 755
    ;; should be gnus-characterp, but this can't be called in XEmacs anyway
    (cons (and (numberp event) event) event)))

(defun gnus-sortable-date (date)
756 757
  "Make string suitable for sorting from DATE."
  (gnus-time-iso8601 (date-to-time date)))
Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
758 759 760 761 762 763 764 765 766 767 768 769 770 771 772

(defun gnus-copy-file (file &optional to)
  "Copy FILE to TO."
  (interactive
   (list (read-file-name "Copy file: " default-directory)
	 (read-file-name "Copy file to: " default-directory)))
  (unless to
    (setq to (read-file-name "Copy file to: " default-directory)))
  (when (file-directory-p to)
    (setq to (concat (file-name-as-directory to)
		     (file-name-nondirectory file))))
  (copy-file file to))

(defvar gnus-work-buffer " *gnus work*")

773 774 775 776
(declare-function gnus-get-buffer-create "gnus" (name))
;; gnus.el requires mm-util.
(declare-function mm-enable-multibyte "mm-util")

Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
777 778 779 780 781 782
(defun gnus-set-work-buffer ()
  "Put point in the empty Gnus work buffer."
  (if (get-buffer gnus-work-buffer)
      (progn
	(set-buffer gnus-work-buffer)
	(erase-buffer))
783
    (set-buffer (gnus-get-buffer-create gnus-work-buffer))
Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
784
    (kill-all-local-variables)
785
    (mm-enable-multibyte)))
Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
786 787 788 789 790 791 792 793

(defmacro gnus-group-real-name (group)
  "Find the real name of a foreign newsgroup."
  `(let ((gname ,group))
     (if (string-match "^[^:]+:" gname)
	 (substring gname (match-end 0))
       gname)))

Miles Bader's avatar
Miles Bader committed
794 795 796 797 798 799 800 801 802 803 804
(defmacro gnus-group-server (group)
  "Find the server name of a foreign newsgroup.
For example, (gnus-group-server \"nnimap+yxa:INBOX.foo\") would
yield \"nnimap:yxa\"."
  `(let ((gname ,group))
     (if (string-match "^\\([^:+]+\\)\\(?:\\+\\([^:]*\\)\\)?:" gname)
	 (format "%s:%s" (match-string 1 gname) (or
						 (match-string 2 gname)
						 ""))
       (format "%s:%s" (car gnus-select-method) (cadr gnus-select-method)))))

Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
805
(defun gnus-make-sort-function (funs)
806
  "Return a composite sort condition based on the functions in FUNS."
Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
807
  (cond
808
   ;; Just a simple function.
809
   ((functionp funs) funs)
810
   ;; No functions at all.
Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
811
   ((null funs) funs)
812 813 814
   ;; A list of functions.
   ((or (cdr funs)
	(listp (car funs)))
815 816 817
    (gnus-byte-compile
     `(lambda (t1 t2)
	,(gnus-make-sort-function-1 (reverse funs)))))
818
   ;; A list containing just one function.
Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
819 820 821 822
   (t
    (car funs))))

(defun gnus-make-sort-function-1 (funs)
823
  "Return a composite sort condition based on the functions in FUNS."
824 825 826 827 828 829 830 831 832 833
  (let ((function (car funs))
	(first 't1)
	(last 't2))
    (when (consp function)
      (cond
       ;; Reversed spec.
       ((eq (car function) 'not)
	(setq function (cadr function)
	      first 't2
	      last 't1))
834
       ((functionp function)
835 836 837 838 839 840 841 842 843
	;; Do nothing.
	)
       (t
	(error "Invalid sort spec: %s" function))))
    (if (cdr funs)
	`(or (,function ,first ,last)
	     (and (not (,function ,last ,first))
		  ,(gnus-make-sort-function-1 (cdr funs))))
      `(,function ,first ,last))))
Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
844 845 846 847 848 849

(defun gnus-turn-off-edit-menu (type)
  "Turn off edit menu in `gnus-TYPE-mode-map'."
  (define-key (symbol-value (intern (format "gnus-%s-mode-map" type)))
    [menu-bar edit] 'undefined))

850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869
(defmacro gnus-bind-print-variables (&rest forms)
  "Bind print-* variables and evaluate FORMS.
This macro is used with `prin1', `pp', etc. in order to ensure printed
Lisp objects are loadable.  Bind `print-quoted' and `print-readably'
to t, and `print-escape-multibyte', `print-escape-newlines',
`print-escape-nonascii', `print-length', `print-level' and
`print-string-length' to nil."
  `(let ((print-quoted t)
	 (print-readably t)
	 ;;print-circle
	 ;;print-continuous-numbering
	 print-escape-multibyte
	 print-escape-newlines
	 print-escape-nonascii
	 ;;print-gensym
	 print-length
	 print-level
	 print-string-length)
     ,@forms))

Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
870 871
(defun gnus-prin1 (form)
  "Use `prin1' on FORM in the current buffer.
872 873 874
Bind `print-quoted' and `print-readably' to t, and `print-length' and
`print-level' to nil.  See also `gnus-bind-print-variables'."
  (gnus-bind-print-variables (prin1 form (current-buffer))))
Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
875 876

(defun gnus-prin1-to-string (form)
877 878 879 880 881
  "The same as `prin1'.
Bind `print-quoted' and `print-readably' to t, and `print-length' and
`print-level' to nil.  See also `gnus-bind-print-variables'."
  (gnus-bind-print-variables (prin1-to-string form)))

882
(defun gnus-pp (form &optional stream)
883 884 885
  "Use `pp' on FORM in the current buffer.
Bind `print-quoted' and `print-readably' to t, and `print-length' and
`print-level' to nil.  See also `gnus-bind-print-variables'."
886
  (gnus-bind-print-variables (pp form (or stream (current-buffer)))))
887 888 889 890 891 892

(defun gnus-pp-to-string (form)
  "The same as `pp-to-string'.
Bind `print-quoted' and `print-readably' to t, and `print-length' and
`print-level' to nil.  See also `gnus-bind-print-variables'."
  (gnus-bind-print-variables (pp-to-string form)))
Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
893 894 895

(defun gnus-make-directory (directory)
  "Make DIRECTORY (and all its parents) if it doesn't exist."
896
  (require 'nnmail)
897 898 899 900
  (let ((file-name-coding-system nnmail-pathname-coding-system))
    (when (and directory
	       (not (file-exists-p directory)))
      (make-directory directory t)))
Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
901 902 903 904
  t)

(defun gnus-write-buffer (file)
  "Write the current buffer's contents to FILE."
905
  (let ((file-name-coding-system nnmail-pathname-coding-system))
906 907
    ;; Make sure the directory exists.
    (gnus-make-directory (file-name-directory file))
908 909
    ;; Write the buffer.
    (write-region (point-min) (point-max) file nil 'quietly)))
Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
910 911 912 913 914 915

(defun gnus-delete-file (file)
  "Delete FILE if it exists."
  (when (file-exists-p file)
    (delete-file file)))

916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932
(defun gnus-delete-directory (directory)
  "Delete files in DIRECTORY.  Subdirectories remain.
If there's no subdirectory, delete DIRECTORY as well."
  (when (file-directory-p directory)
    (let ((files (directory-files
		  directory t "^\\([^.]\\|\\.\\([^.]\\|\\..\\)\\).*"))
	  file dir)
      (while files
	(setq file (pop files))
	(if (eq t (car (file-attributes file)))
	    ;; `file' is a subdirectory.
	    (setq dir t)
	  ;; `file' is a file or a symlink.
	  (delete-file file)))
      (unless dir
	(delete-directory directory)))))

Miles Bader's avatar
Miles Bader committed
933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954
;; The following two functions are used in gnus-registry.
;; They were contributed by Andreas Fuchs <asf@void.at>.
(defun gnus-alist-to-hashtable (alist)
  "Build a hashtable from the values in ALIST."
  (let ((ht (make-hash-table
	     :size 4096
	     :test 'equal)))
    (mapc
     (lambda (kv-pair)
       (puthash (car kv-pair) (cdr kv-pair) ht))
     alist)
     ht))

(defun gnus-hashtable-to-alist (hash)
  "Build an alist from the values in HASH."
  (let ((list nil))
    (maphash
     (lambda (key value)
       (setq list (cons (cons key value) list)))
     hash)
    list))

Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
955 956 957 958 959 960
(defun gnus-strip-whitespace (string)
  "Return STRING stripped of all whitespace."
  (while (string-match "[\r\n\t ]+" string)
    (setq string (replace-match "" t t string)))
  string)

961 962 963
(declare-function gnus-put-text-property "gnus"
                  (start end property value &optional object))

964
(defsubst gnus-put-text-property-excluding-newlines (beg end prop val)
Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
965 966 967 968 969
  "The same as `put-text-property', but don't put this prop on any newlines in the region."
  (save-match-data
    (save-excursion
      (save-restriction
	(goto-char beg)
970
	(while (re-search-forward gnus-emphasize-whitespace-regexp end 'move)
971
	  (gnus-put-text-property beg (match-beginning 0) prop val)
Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
972
	  (setq beg (point)))
973 974
	(gnus-put-text-property beg (point) prop val)))))

975 976 977 978
(declare-function gnus-overlay-put  "gnus" (overlay prop value))
(declare-function gnus-make-overlay "gnus"
                  (beg end &optional buffer front-advance rear-advance))

979 980 981 982 983 984 985 986 987 988 989 990 991
(defsubst gnus-put-overlay-excluding-newlines (beg end prop val)
  "The same as `put-text-property', but don't put this prop on any newlines in the region."
  (save-match-data
    (save-excursion
      (save-restriction
	(goto-char beg)
	(while (re-search-forward gnus-emphasize-whitespace-regexp end 'move)
	  (gnus-overlay-put
	   (gnus-make-overlay beg (match-beginning 0))
	   prop val)
	  (setq beg (point)))
	(gnus-overlay-put (gnus-make-overlay beg (point)) prop val)))))

992 993 994 995 996 997 998 999
(defun gnus-put-text-property-excluding-characters-with-faces (beg end
								   prop val)
  "The same as `put-text-property', but don't put props on characters with the `gnus-face' property."
  (let ((b beg))
    (while (/= b end)
      (when (get-text-property b 'gnus-face)
	(setq b (next-single-property-change b 'gnus-face nil end)))
      (when (/= b end)
1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016
	(inline
	  (gnus-put-text-property
	   b (setq b (next-single-property-change b 'gnus-face nil end))
	   prop val))))))

(defmacro gnus-faces-at (position)
  "Return a list of faces at POSITION."
  (if (featurep 'xemacs)
      `(let ((pos ,position))
	 (mapcar-extents 'extent-face
			 nil (current-buffer) pos pos nil 'face))
    `(let ((pos ,position))
       (delq nil (cons (get-text-property pos 'face)
		       (mapcar
			(lambda (overlay)
			  (overlay-get overlay 'face))
			(overlays-at pos)))))))
Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
1017

Katsumi Yamaoka's avatar
Katsumi Yamaoka committed
1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040
(if (fboundp 'invisible-p)
    (defalias 'gnus-invisible-p 'invisible-p)
  ;; for Emacs < 22.2, and XEmacs.
  (defun gnus-invisible-p (pos)
    "Return non-nil if the character after POS is currently invisible."
    (let ((prop (get-char-property pos 'invisible)))
      (if (eq buffer-invisibility-spec t)
	  prop
	(or (memq prop buffer-invisibility-spec)
	    (assq prop buffer-invisibility-spec))))))

;; Note: the optional 2nd argument has a different meaning between
;; Emacs and XEmacs.
;; (next-char-property-change POSITION &optional LIMIT)
;; (next-extent-change        POS      &optional OBJECT)
(defalias 'gnus-next-char-property-change
  (if (fboundp 'next-extent-change)
      'next-extent-change 'next-char-property-change))

(defalias 'gnus-previous-char-property-change
  (if (fboundp 'previous-extent-change)
      'previous-extent-change 'previous-char-property-change))

Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
1041
;;; Protected and atomic operations.  dmoore@ucsd.edu 21.11.1996
1042 1043 1044 1045
;; The primary idea here is to try to protect internal datastructures
;; from becoming corrupted when the user hits C-g, or if a hook or
;; similar blows up.  Often in Gnus multiple tables/lists need to be
;; updated at the same time, or information can be lost.
Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063

(defvar gnus-atomic-be-safe t
  "If t, certain operations will be protected from interruption by C-g.")

(defmacro gnus-atomic-progn (&rest forms)
  "Evaluate FORMS atomically, which means to protect the evaluation
from being interrupted by the user.  An error from the forms themselves
will return without finishing the operation.  Since interrupts from
the user are disabled, it is recommended that only the most minimal
operations are performed by FORMS.  If you wish to assign many
complicated values atomically, compute the results into temporary
variables and then do only the assignment atomically."
  `(let ((inhibit-quit gnus-atomic-be-safe))
     ,@forms))

(put 'gnus-atomic-progn 'lisp-indent-function 0)

(defmacro gnus-atomic-progn-assign (protect &rest forms)
1064
  "Evaluate FORMS, but ensure that the variables listed in PROTECT
Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
1065 1066 1067 1068 1069
are not changed if anything in FORMS signals an error or otherwise
non-locally exits.  The variables listed in PROTECT are updated atomically.
It is safe to use gnus-atomic-progn-assign with long computations.

Note that if any of the symbols in PROTECT were unbound, they will be
ShengHuo ZHU's avatar
Typos.  
ShengHuo ZHU committed
1070
set to nil on a successful assignment.  In case of an error or other
Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117
non-local exit, it will still be unbound."
  (let* ((temp-sym-map (mapcar (lambda (x) (list (make-symbol
						  (concat (symbol-name x)
							  "-tmp"))
						 x))
			       protect))
	 (sym-temp-map (mapcar (lambda (x) (list (cadr x) (car x)))
			       temp-sym-map))
	 (temp-sym-let (mapcar (lambda (x) (list (car x)
						 `(and (boundp ',(cadr x))
						       ,(cadr x))))
			       temp-sym-map))
	 (sym-temp-let sym-temp-map)
	 (temp-sym-assign (apply 'append temp-sym-map))
	 (sym-temp-assign (apply 'append sym-temp-map))
	 (result (make-symbol "result-tmp")))
    `(let (,@temp-sym-let
	   ,result)
       (let ,sym-temp-let
	 (setq ,result (progn ,@forms))
	 (setq ,@temp-sym-assign))
       (let ((inhibit-quit gnus-atomic-be-safe))
	 (setq ,@sym-temp-assign))
       ,result)))

(put 'gnus-atomic-progn-assign 'lisp-indent-function 1)
;(put 'gnus-atomic-progn-assign 'edebug-form-spec '(sexp body))

(defmacro gnus-atomic-setq (&rest pairs)
  "Similar to setq, except that the real symbols are only assigned when
there are no errors.  And when the real symbols are assigned, they are
done so atomically.  If other variables might be changed via side-effect,
see gnus-atomic-progn-assign.  It is safe to use gnus-atomic-setq
with potentially long computations."
  (let ((tpairs pairs)
	syms)
    (while tpairs
      (push (car tpairs) syms)
      (setq tpairs (cddr tpairs)))
    `(gnus-atomic-progn-assign ,syms
       (setq ,@pairs))))

;(put 'gnus-atomic-setq 'edebug-form-spec '(body))


;;; Functions for saving to babyl/mail files.

1118
(eval-when-compile
1119 1120 1121 1122 1123 1124 1125 1126 1127
  (if (featurep 'xemacs)
      ;; Don't load tm and apel XEmacs packages that provide some
      ;; Emacs emulating functions and variables.
      (let ((features features))
	(provide 'tm-view)
	(unless (fboundp 'set-alist) (defalias 'set-alist 'ignore))
	(require 'rmail)) ;; It requires tm-view that loads apel.
    (require 'rmail))
  (autoload 'rmail-update-summary "rmailsum"))
Dan Nicolaescu's avatar
Dan Nicolaescu committed
1128 1129

(defvar mm-text-coding-system)
1130

1131 1132 1133
(declare-function mm-append-to-file "mm-util"
                  (start end filename &optional codesys inhibit))

Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
1134
(defun gnus-output-to-rmail (filename &optional ask)
1135 1136 1137
  "Append the current article to an Rmail file named FILENAME.
In Emacs 22 this writes Babyl format; in Emacs 23 it writes mbox unless
FILENAME exists and is Babyl format."
Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
1138
  (require 'rmail)
1139
  (require 'mm-util)
1140
  ;; Some of this codes is borrowed from rmailout.el.
Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
1141
  (setq filename (expand-file-name filename))
1142 1143 1144 1145 1146
  ;; FIXME should we really be messing with this defcustom?
  ;; It is not needed for the operation of this function.
  (if (boundp 'rmail-default-rmail-file)
      (setq rmail-default-rmail-file filename) ; 22
    (setq rmail-default-file filename))        ; 23
Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
1147
  (let ((artbuf (current-buffer))
1148 1149 1150
	(tmpbuf (get-buffer-create " *Gnus-output*"))
        ;; Babyl rmail.el defines this, mbox does not.
        (babyl (fboundp 'rmail-insert-rmail-file-header)))
Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
1151
    (save-excursion
1152 1153 1154 1155 1156 1157 1158 1159
      ;; Note that we ignore the possibility of visiting a Babyl
      ;; format buffer in Emacs 23, since Rmail no longer supports that.
     (or (get-file-buffer filename)
         (progn
           ;; In case someone wants to write to a Babyl file from Emacs 23.
           (when (file-exists-p filename)
             (setq babyl (mail-file-babyl-p filename))
             t))
Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
1160 1161 1162 1163
	  (if (or (not ask)
		  (gnus-yes-or-no-p
		   (concat "\"" filename "\" does not exist, create it? ")))
	      (let ((file-buffer (create-file-buffer filename)))
1164
		(with-current-buffer file-buffer
1165 1166
                  (if (fboundp 'rmail-insert-rmail-file-header)
                      (rmail-insert-rmail-file-header))
1167 1168
		  (let ((require-final-newline nil)
			(coding-system-for-write mm-text-coding-system))
Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
1169 1170 1171 1172 1173 1174
		    (gnus-write-buffer filename)))
		(kill-buffer file-buffer))
	    (error "Output file does not exist")))
      (set-buffer tmpbuf)
      (erase-buffer)
      (insert-buffer-substring artbuf)
1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185
      (if babyl
          (gnus-convert-article-to-rmail)
        ;; Non-Babyl case copied from gnus-output-to-mail.
        (goto-char (point-min))
        (if (looking-at "From ")
            (forward-line 1)
          (insert "From nobody " (current-time-string) "\n"))
        (let (case-fold-search)
          (while (re-search-forward "^From " nil t)
            (beginning-of-line)
            (insert ">"))))
Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
1186 1187 1188
      ;; Decide whether to append to a file or to an Emacs buffer.
      (let ((outbuf (get-file-buffer filename)))
	(if (not outbuf)
1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200
            (progn
              (unless babyl             ; from gnus-output-to-mail
                (let ((buffer-read-only nil))
                  (goto-char (point-max))
                  (forward-char -2)
                  (unless (looking-at "\n\n")
                    (goto-char (point-max))
                    (unless (bolp)
                      (insert "\n"))
                    (insert "\n"))))
              (let ((file-name-coding-system nnmail-pathname-coding-system))
                (mm-append-to-file (point-min) (point-max) filename)))
Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
1201 1202 1203 1204 1205 1206
	  ;; File has been visited, in buffer OUTBUF.
	  (set-buffer outbuf)
	  (let ((buffer-read-only nil)
		(msg (and (boundp 'rmail-current-message)
			  (symbol-value 'rmail-current-message))))
	    ;; If MSG is non-nil, buffer is in RMAIL mode.
1207
            ;; Compare this with rmail-output-to-rmail-buffer in Emacs 23.
Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
1208
	    (when msg
1209 1210 1211 1212 1213
              (unless babyl
                (rmail-swap-buffers-maybe)
                (rmail-maybe-set-message-counters))
              (widen)
              (narrow-to-region (point-max) (point-max)))
Lars Magne Ingebrigtsen's avatar
Lars Magne Ingebrigtsen committed
1214 1215
	    (insert-buffer-substring tmpbuf)
	    (when msg
1216 1217 1218 1219 1220
              (when babyl
                (goto-char (point-min))
                (widen)
                (search-backward "\n\^_")
                (narrow-to-region (point) (point-max)))
1221 1222
	      (rmail-count-new-messages t)
	      (when (rmail-summary-exists)
1223 1224 1225 1226
		(rmail-select-summary
		 (rmail-update-summary)))
	      (rmail-show-message msg))
	    (save-buffer)))))