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- ;;; gnus-util.el --- utility functions for Gnus
- ;; Copyright (C) 1996,97 Free Software Foundation, Inc.
-
- ;; Author: Lars Magne Ingebrigtsen <larsi@ifi.uio.no>
- ;; Keywords: news
-
- ;; This file is part of GNU Emacs.
-
- ;; GNU Emacs is free software; you can redistribute it and/or modify
- ;; it under the terms of the GNU General Public License as published by
- ;; the Free Software Foundation; either version 2, or (at your option)
- ;; any later version.
-
- ;; GNU Emacs is distributed in the hope that it will be useful,
- ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
- ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- ;; GNU General Public License for more details.
-
- ;; You should have received a copy of the GNU General Public License
- ;; along with GNU Emacs; see the file COPYING. If not, write to the
- ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- ;; Boston, MA 02111-1307, USA.
-
- ;;; Commentary:
-
- ;; 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.
-
- ;;; Code:
-
- (require 'custom)
- (eval-when-compile (require 'cl))
- (require 'nnheader)
- (require 'timezone)
- (require 'message)
-
- (eval-and-compile
- (autoload 'nnmail-date-to-time "nnmail"))
-
- (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"))
- (w (make-symbol "w"))
- (buf (make-symbol "buf")))
- `(let* ((,tempvar (selected-window))
- (,buf ,buffer)
- (,w (get-buffer-window ,buf 'visible)))
- (unwind-protect
- (progn
- (if ,w
- (progn
- (select-window ,w)
- (set-buffer (window-buffer ,w)))
- (pop-to-buffer ,buf))
- ,@forms)
- (select-window ,tempvar)))))
-
- (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)
- "Set hash value. Arguments are STRING, VALUE, and HASHTABLE."
- `(let ((symbol (intern ,string ,hashtable)))
- (or (boundp symbol)
- (set symbol nil))
- symbol))
-
- ;; modified by MORIOKA Tomohiko <morioka@jaist.ac.jp>
- ;; function `substring' might cut on a middle of multi-octet
- ;; character.
- (defun gnus-truncate-string (str width)
- (substring str 0 width))
-
- ;; Added by Geoffrey T. Dairiki <dairiki@u.washington.edu>. A safe way
- ;; to limit the length of a string. This function is necessary since
- ;; `(substr "abc" 0 30)' pukes with "Args out of range".
- (defsubst gnus-limit-string (str width)
- (if (> (length str) width)
- (substring str 0 width)
- str))
-
- (defsubst gnus-functionp (form)
- "Return non-nil if FORM is funcallable."
- (or (and (symbolp form) (fboundp form))
- (and (listp form) (eq (car form) 'lambda))
- (compiled-function-p form)))
-
- (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))))
-
- (defmacro gnus-kill-buffer (buffer)
- `(let ((buf ,buffer))
- (when (gnus-buffer-exists-p buf)
- (kill-buffer buf))))
-
- (if (fboundp 'point-at-bol)
- (fset 'gnus-point-at-bol 'point-at-bol)
- (defun gnus-point-at-bol ()
- "Return point at the beginning of the line."
- (let ((p (point)))
- (beginning-of-line)
- (prog1
- (point)
- (goto-char p)))))
-
- (if (fboundp 'point-at-eol)
- (fset 'gnus-point-at-eol 'point-at-eol)
- (defun gnus-point-at-eol ()
- "Return point at the end of the line."
- (let ((p (point)))
- (end-of-line)
- (prog1
- (point)
- (goto-char p)))))
-
- (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)
- `(delete-region (progn (beginning-of-line) (point))
- (progn (forward-line ,(or n 1)) (point))))
-
- (defun gnus-byte-code (func)
- "Return a form that can be `eval'ed based on FUNC."
- (let ((fval (symbol-function func)))
- (if (compiled-function-p fval)
- (let ((flist (append fval nil)))
- (setcar flist 'byte-code)
- flist)
- (cons 'progn (cddr fval)))))
-
- (defun gnus-extract-address-components (from)
- (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.
- (when (string-match "\\b[^@ \t<>]+[!@][^@ \t<>]+\\b" from)
- (setq address (substring from (match-beginning 0) (match-end 0))))
- ;; Then we check whether the "name <address>" format is used.
- (and address
- ;; Fix by MORIOKA Tomohiko <morioka@jaist.ac.jp>
- ;; 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.
- (string-match "\".*\"" name)
- (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))
- ;; Fix by MORIOKA Tomohiko <morioka@jaist.ac.jp>.
- ;; XOVER might not support folded From headers.
- (and (string-match "(.*" from)
- (setq name (substring from (1+ (match-beginning 0))
- (match-end 0)))))
- ;; Fix by Hallvard B Furuseth <h.b.furuseth@usit.uio.no>.
- (list (or name from) (or address from))))
-
- (defun gnus-fetch-field (field)
- "Return the value of the header FIELD of current article."
- (save-excursion
- (save-restriction
- (let ((case-fold-search t)
- (inhibit-point-motion-hooks t))
- (nnheader-narrow-to-headers)
- (message-fetch-field field)))))
-
- (defun gnus-goto-colon ()
- (beginning-of-line)
- (search-forward ":" (gnus-point-at-eol) t))
-
- (defun gnus-remove-text-with-property (prop)
- "Delete all text in the current buffer with text property PROP."
- (save-excursion
- (goto-char (point-min))
- (while (not (eobp))
- (while (get-text-property (point) prop)
- (delete-char 1))
- (goto-char (next-single-property-change (point) prop nil (point-max))))))
-
- (defun gnus-newsgroup-directory-form (newsgroup)
- "Make hierarchical directory name from NEWSGROUP name."
- (let ((newsgroup (gnus-newsgroup-savable-name newsgroup))
- (len (length newsgroup))
- idx)
- ;; If this is a foreign group, we don't want to translate the
- ;; entire name.
- (if (setq idx (string-match ":" newsgroup))
- (aset newsgroup idx ?/)
- (setq idx 0))
- ;; Replace all occurrences of `.' with `/'.
- (while (< idx len)
- (when (= (aref newsgroup idx) ?.)
- (aset newsgroup idx ?/))
- (setq idx (1+ idx)))
- newsgroup))
-
- (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))))
-
- ;;; Time functions.
-
- (defun gnus-days-between (date1 date2)
- ;; Return the number of days between date1 and date2.
- (- (gnus-day-number date1) (gnus-day-number date2)))
-
- (defun gnus-day-number (date)
- (let ((dat (mapcar (lambda (s) (and s (string-to-int s)) )
- (timezone-parse-date date))))
- (timezone-absolute-from-gregorian
- (nth 1 dat) (nth 2 dat) (car dat))))
-
- (defun gnus-time-to-day (time)
- "Convert TIME to day number."
- (let ((tim (decode-time time)))
- (timezone-absolute-from-gregorian
- (nth 4 tim) (nth 3 tim) (nth 5 tim))))
-
- (defun gnus-encode-date (date)
- "Convert DATE to internal time."
- (let* ((parse (timezone-parse-date date))
- (date (mapcar (lambda (d) (and d (string-to-int d))) parse))
- (time (mapcar 'string-to-int (timezone-parse-time (aref parse 3)))))
- (encode-time (caddr time) (cadr time) (car time)
- (caddr date) (cadr date) (car date)
- (* 60 (timezone-zone-to-minute (nth 4 date))))))
-
- (defun gnus-time-minus (t1 t2)
- "Subtract two internal times."
- (let ((borrow (< (cadr t1) (cadr t2))))
- (list (- (car t1) (car t2) (if borrow 1 0))
- (- (+ (if borrow 65536 0) (cadr t1)) (cadr t2)))))
-
- (defun gnus-time-less (t1 t2)
- "Say whether time T1 is less than time T2."
- (or (< (car t1) (car t2))
- (and (= (car t1) (car t2))
- (< (nth 1 t1) (nth 1 t2)))))
-
- (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))))))
-
- ;;; 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)))))
-
- (defun gnus-completing-read (default prompt &rest args)
- ;; Like `completing-read', except that DEFAULT is the default argument.
- (let* ((prompt (if default
- (concat prompt " (default " default ") ")
- (concat prompt " ")))
- (answer (apply 'completing-read prompt args)))
- (if (or (null answer) (zerop (length answer)))
- default
- answer)))
-
- ;; Two silly functions to ensure that all `y-or-n-p' questions clear
- ;; the echo area.
- (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 "")))
-
- ;; I suspect there's a better way, but I haven't taken the time to do
- ;; it yet. -erik selberg@cs.washington.edu
- (defun gnus-dd-mmm (messy-date)
- "Return a string like DD-MMM from a big messy string"
- (let ((datevec (ignore-errors (timezone-parse-date messy-date))))
- (if (not datevec)
- "??-???"
- (format "%2s-%s"
- (condition-case ()
- ;; Make sure leading zeroes are stripped.
- (number-to-string (string-to-number (aref datevec 2)))
- (error "??"))
- (capitalize
- (or (car
- (nth (1- (string-to-number (aref datevec 1)))
- timezone-months-assoc))
- "???"))))))
-
- (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 (nnmail-date-to-time d)))
- ;; and store it back in the string.
- (put-text-property 0 1 'gnus-time time d)
- time)))))
-
- (defsubst gnus-time-iso8601 (time)
- "Return a string of TIME in YYMMDDTHHMMSS format."
- (format-time-string "%Y%m%dT%H%M%S" time))
-
- (defun gnus-date-iso8601 (header)
- "Convert the date field in HEADER to YYMMDDTHHMMSS"
- (condition-case ()
- (gnus-time-iso8601 (gnus-date-get-time (mail-header-date header)))
- (error "")))
-
- (defun gnus-mode-string-quote (string)
- "Quote all \"%\"'s in STRING."
- (save-excursion
- (gnus-set-work-buffer)
- (insert string)
- (goto-char (point-min))
- (while (search-forward "%" nil t)
- (insert "%"))
- (buffer-string)))
-
- ;; 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)
-
- ;; Show message if message has a lower level than `gnus-verbose'.
- ;; 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.
- (defun gnus-message (level &rest args)
- (if (<= level gnus-verbose)
- (apply 'message args)
- ;; 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)))
-
- (defun gnus-error (level &rest args)
- "Beep an error if LEVEL is equal to or less than `gnus-verbose'."
- (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)
- ids)
- (while (string-match "<[^>]+>" references beg)
- (push (substring references (match-beginning 0) (setq beg (match-end 0)))
- ids))
- (nreverse ids)))
-
- (defun gnus-parent-id (references &optional n)
- "Return the last Message-ID in REFERENCES.
- If N, return the Nth ancestor instead."
- (when references
- (let ((ids (inline (gnus-split-references references))))
- (while (nthcdr (or n 1) ids)
- (setq ids (cdr ids)))
- (car ids))))
-
- (defsubst gnus-buffer-live-p (buffer)
- "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))
- (set-window-hscroll (get-buffer-window (current-buffer) t) 0)
- (let* ((orig (point))
- (end (window-end (get-buffer-window (current-buffer) t)))
- (max 0))
- ;; 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
- (get-buffer-window (current-buffer) t)
- (min (- (current-column) (/ (window-width) 3))
- (+ 2 (- max (window-width)))))
- (set-window-hscroll (get-buffer-window (current-buffer) t) 0))
- max)))
-
- (defun gnus-read-event-char ()
- "Get the next event."
- (let ((event (read-event)))
- ;; should be gnus-characterp, but this can't be called in XEmacs anyway
- (cons (and (numberp event) event) event)))
-
- (defun gnus-sortable-date (date)
- "Make sortable string by string-lessp from DATE.
- Timezone package is used."
- (condition-case ()
- (progn
- (setq date (inline (timezone-fix-time
- date nil
- (aref (inline (timezone-parse-date date)) 4))))
- (inline
- (timezone-make-sortable-date
- (aref date 0) (aref date 1) (aref date 2)
- (inline
- (timezone-make-time-string
- (aref date 3) (aref date 4) (aref date 5))))))
- (error "")))
-
- (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))
-
- (defun gnus-kill-all-overlays ()
- "Delete all overlays in the current buffer."
- (unless gnus-xemacs
- (let* ((overlayss (overlay-lists))
- (buffer-read-only nil)
- (overlays (delq nil (nconc (car overlayss) (cdr overlayss)))))
- (while overlays
- (delete-overlay (pop overlays))))))
-
- (defvar gnus-work-buffer " *gnus work*")
-
- (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))
- (set-buffer (get-buffer-create gnus-work-buffer))
- (kill-all-local-variables)
- (buffer-disable-undo (current-buffer))))
-
- (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)))
-
- (defun gnus-make-sort-function (funs)
- "Return a composite sort condition based on the functions in FUNC."
- (cond
- ((not (listp funs)) funs)
- ((null funs) funs)
- ((cdr funs)
- `(lambda (t1 t2)
- ,(gnus-make-sort-function-1 (reverse funs))))
- (t
- (car funs))))
-
- (defun gnus-make-sort-function-1 (funs)
- "Return a composite sort condition based on the functions in FUNC."
- (if (cdr funs)
- `(or (,(car funs) t1 t2)
- (and (not (,(car funs) t2 t1))
- ,(gnus-make-sort-function-1 (cdr funs))))
- `(,(car funs) t1 t2)))
-
- (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))
-
- (defun gnus-prin1 (form)
- "Use `prin1' on FORM in the current buffer.
- Bind `print-quoted' to t while printing."
- (let ((print-quoted t)
- print-level print-length)
- (prin1 form (current-buffer))))
-
- (defun gnus-prin1-to-string (form)
- "The same as `prin1', but but `print-quoted' to t."
- (let ((print-quoted t))
- (prin1-to-string form)))
-
- (defun gnus-make-directory (directory)
- "Make DIRECTORY (and all its parents) if it doesn't exist."
- (when (and directory
- (not (file-exists-p directory)))
- (make-directory directory t))
- t)
-
- (defun gnus-write-buffer (file)
- "Write the current buffer's contents to FILE."
- ;; Make sure the directory exists.
- (gnus-make-directory (file-name-directory file))
- ;; Write the buffer.
- (write-region (point-min) (point-max) file nil 'quietly))
-
- (defmacro gnus-delete-assq (key list)
- `(let ((listval (eval ,list)))
- (setq ,list (delq (assq ,key listval) listval))))
-
- (defmacro gnus-delete-assoc (key list)
- `(let ((listval ,list))
- (setq ,list (delq (assoc ,key listval) listval))))
-
- (defun gnus-delete-file (file)
- "Delete FILE if it exists."
- (when (file-exists-p file)
- (delete-file file)))
-
- (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)
-
- (defun gnus-put-text-property-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 "[ \t]*\n" end 'move)
- (put-text-property beg (match-beginning 0) prop val)
- (setq beg (point)))
- (put-text-property beg (point) prop val)))))
-
- ;;; Protected and atomic operations. dmoore@ucsd.edu 21.11.1996
- ;;; 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.
-
- (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)
- "Evaluate FORMS, but insure that the variables listed in PROTECT
- 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
- set to nil on a sucessful assignment. In case of an error or other
- 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.
-
- (defvar rmail-default-rmail-file)
- (defun gnus-output-to-rmail (filename &optional ask)
- "Append the current article to an Rmail file named FILENAME."
- (require 'rmail)
- ;; Most of these codes are borrowed from rmailout.el.
- (setq filename (expand-file-name filename))
- (setq rmail-default-rmail-file filename)
- (let ((artbuf (current-buffer))
- (tmpbuf (get-buffer-create " *Gnus-output*")))
- (save-excursion
- (or (get-file-buffer filename)
- (file-exists-p filename)
- (if (or (not ask)
- (gnus-yes-or-no-p
- (concat "\"" filename "\" does not exist, create it? ")))
- (let ((file-buffer (create-file-buffer filename)))
- (save-excursion
- (set-buffer file-buffer)
- (rmail-insert-rmail-file-header)
- (let ((require-final-newline nil))
- (gnus-write-buffer filename)))
- (kill-buffer file-buffer))
- (error "Output file does not exist")))
- (set-buffer tmpbuf)
- (erase-buffer)
- (insert-buffer-substring artbuf)
- (gnus-convert-article-to-rmail)
- ;; Decide whether to append to a file or to an Emacs buffer.
- (let ((outbuf (get-file-buffer filename)))
- (if (not outbuf)
- (append-to-file (point-min) (point-max) filename)
- ;; 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.
- (when msg
- (widen)
- (narrow-to-region (point-max) (point-max)))
- (insert-buffer-substring tmpbuf)
- (when msg
- (goto-char (point-min))
- (widen)
- (search-backward "\^_")
- (narrow-to-region (point) (point-max))
- (goto-char (1+ (point-min)))
- (rmail-count-new-messages t)
- (rmail-show-message msg))))))
- (kill-buffer tmpbuf)))
-
- (defun gnus-output-to-mail (filename &optional ask)
- "Append the current article to a mail file named FILENAME."
- (setq filename (expand-file-name filename))
- (let ((artbuf (current-buffer))
- (tmpbuf (get-buffer-create " *Gnus-output*")))
- (save-excursion
- ;; Create the file, if it doesn't exist.
- (when (and (not (get-file-buffer filename))
- (not (file-exists-p filename)))
- (if (or (not ask)
- (gnus-y-or-n-p
- (concat "\"" filename "\" does not exist, create it? ")))
- (let ((file-buffer (create-file-buffer filename)))
- (save-excursion
- (set-buffer file-buffer)
- (let ((require-final-newline nil))
- (gnus-write-buffer filename)))
- (kill-buffer file-buffer))
- (error "Output file does not exist")))
- (set-buffer tmpbuf)
- (erase-buffer)
- (insert-buffer-substring artbuf)
- (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 ">")))
- ;; Decide whether to append to a file or to an Emacs buffer.
- (let ((outbuf (get-file-buffer filename)))
- (if (not outbuf)
- (let ((buffer-read-only nil))
- (save-excursion
- (goto-char (point-max))
- (forward-char -2)
- (unless (looking-at "\n\n")
- (goto-char (point-max))
- (unless (bolp)
- (insert "\n"))
- (insert "\n"))
- (goto-char (point-max))
- (append-to-file (point-min) (point-max) filename)))
- ;; File has been visited, in buffer OUTBUF.
- (set-buffer outbuf)
- (let ((buffer-read-only nil))
- (goto-char (point-max))
- (unless (eobp)
- (insert "\n"))
- (insert "\n")
- (insert-buffer-substring tmpbuf)))))
- (kill-buffer tmpbuf)))
-
- (defun gnus-convert-article-to-rmail ()
- "Convert article in current buffer to Rmail message format."
- (let ((buffer-read-only nil))
- ;; Convert article directly into Babyl format.
- (goto-char (point-min))
- (insert "\^L\n0, unseen,,\n*** EOOH ***\n")
- (while (search-forward "\n\^_" nil t) ;single char
- (replace-match "\n^_" t t)) ;2 chars: "^" and "_"
- (goto-char (point-max))
- (insert "\^_")))
-
- (provide 'gnus-util)
-
- ;;; gnus-util.el ends here
-