-;;; mm-util.el --- Utility functions for MIME things
-;; Copyright (C) 1998 Free Software Foundation, Inc.
+;;; mm-util.el --- Utility functions for Mule and low level things
+;; Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
;; MORIOKA Tomohiko <morioka@jaist.ac.jp>
;;; Code:
-(defvar mm-known-charsets '(iso-8859-1)
- "List of known charsets.")
+(eval-when-compile (require 'cl))
+(require 'mail-prsvr)
+(eval-and-compile
+ (mapcar
+ (lambda (elem)
+ (let ((nfunc (intern (format "mm-%s" (car elem)))))
+ (if (fboundp (car elem))
+ (defalias nfunc (car elem))
+ (defalias nfunc (cdr elem)))))
+ '((decode-coding-string . (lambda (s a) s))
+ (encode-coding-string . (lambda (s a) s))
+ (encode-coding-region . ignore)
+ (coding-system-list . ignore)
+ (decode-coding-region . ignore)
+ (char-int . identity)
+ (device-type . ignore)
+ (coding-system-equal . equal)
+ (annotationp . ignore)
+ (set-buffer-file-coding-system . ignore)
+ (make-char
+ . (lambda (charset int)
+ (int-to-char int)))
+ (read-charset
+ . (lambda (prompt)
+ "Return a charset."
+ (intern
+ (completing-read
+ prompt
+ (mapcar (lambda (e) (list (symbol-name (car e))))
+ mm-mime-mule-charset-alist)
+ nil t))))
+ (subst-char-in-string
+ . (lambda (from to string) ;; stolen (and renamed) from nnheader.el
+ "Replace characters in STRING from FROM to TO."
+ (let ((string (substring string 0)) ;Copy string.
+ (len (length string))
+ (idx 0))
+ ;; Replace all occurrences of FROM with TO.
+ (while (< idx len)
+ (when (= (aref string idx) from)
+ (aset string idx to))
+ (setq idx (1+ idx)))
+ string)))
+ (string-as-unibyte . identity)
+ (string-as-multibyte . identity)
+ (multibyte-string-p . ignore))))
+
+(eval-and-compile
+ (defalias 'mm-char-or-char-int-p
+ (cond
+ ((fboundp 'char-or-char-int-p) 'char-or-char-int-p)
+ ((fboundp 'char-valid-p) 'char-valid-p)
+ (t 'identity))))
+
+(eval-and-compile
+ (defalias 'mm-read-coding-system
+ (cond
+ ((fboundp 'read-coding-system)
+ (if (and (featurep 'xemacs)
+ (<= (string-to-number emacs-version) 21.1))
+ (lambda (prompt &optional default-coding-system)
+ (read-coding-system prompt))
+ 'read-coding-system))
+ (t (lambda (prompt &optional default-coding-system)
+ "Prompt the user for a coding system."
+ (completing-read
+ prompt (mapcar (lambda (s) (list (symbol-name (car s))))
+ mm-mime-mule-charset-alist)))))))
+
+(defvar mm-coding-system-list nil)
+(defun mm-get-coding-system-list ()
+ "Get the coding system list."
+ (or mm-coding-system-list
+ (setq mm-coding-system-list (mm-coding-system-list))))
+
+(defun mm-coding-system-p (sym)
+ "Return non-nil if SYM is a coding system."
+ (or (and (fboundp 'coding-system-p) (coding-system-p sym))
+ (memq sym (mm-get-coding-system-list))))
+
+(defvar mm-charset-synonym-alist
+ `(
+ ;; Perfectly fine? A valid MIME name, anyhow.
+ ,@(unless (mm-coding-system-p 'big5)
+ '((big5 . cn-big5)))
+ ;; Not in XEmacs, but it's not a proper MIME charset anyhow.
+ ,@(unless (mm-coding-system-p 'x-ctext)
+ '((x-ctext . ctext)))
+ ;; Apparently not defined in Emacs 20, but is a valid MIME name.
+ ,@(unless (mm-coding-system-p 'gb2312)
+ '((gb2312 . cn-gb-2312)))
+ ;; ISO-8859-15 is very similar to ISO-8859-1.
+ ,@(unless (mm-coding-system-p 'iso-8859-15) ; Emacs 21 defines it.
+ '((iso-8859-15 . iso-8859-1)))
+ ;; Windows-1252 is actually a superset of Latin-1. See also
+ ;; `gnus-article-dumbquotes-map'.
+ ,@(unless (mm-coding-system-p 'windows-1252)
+ (if (mm-coding-system-p 'cp1252)
+ '((windows-1252 . cp1252))
+ '((windows-1252 . iso-8859-1))))
+ ;; Windows-1250 is a variant of Latin-2 heavily used by Microsoft
+ ;; Outlook users in Czech republic. Use this to allow reading of their
+ ;; e-mails. cp1250 should be defined by M-x codepage-setup.
+ ,@(if (and (not (mm-coding-system-p 'windows-1250))
+ (mm-coding-system-p 'cp1250))
+ '((windows-1250 . cp1250)))
+ )
+ "A mapping from invalid charset names to the real charset names.")
+
+(defvar mm-binary-coding-system
+ (cond
+ ((mm-coding-system-p 'binary) 'binary)
+ ((mm-coding-system-p 'no-conversion) 'no-conversion)
+ (t nil))
+ "100% binary coding system.")
+
+(defvar mm-text-coding-system
+ (or (if (memq system-type '(windows-nt ms-dos ms-windows))
+ (and (mm-coding-system-p 'raw-text-dos) 'raw-text-dos)
+ (and (mm-coding-system-p 'raw-text) 'raw-text))
+ mm-binary-coding-system)
+ "Text-safe coding system (For removing ^M).")
+
+(defvar mm-text-coding-system-for-write nil
+ "Text coding system for write.")
+
+(defvar mm-auto-save-coding-system
+ (cond
+ ((mm-coding-system-p 'emacs-mule)
+ (if (memq system-type '(windows-nt ms-dos ms-windows))
+ (if (mm-coding-system-p 'emacs-mule-dos)
+ 'emacs-mule-dos mm-binary-coding-system)
+ 'emacs-mule))
+ ((mm-coding-system-p 'escape-quoted) 'escape-quoted)
+ (t mm-binary-coding-system))
+ "Coding system of auto save file.")
+
+(defvar mm-universal-coding-system mm-auto-save-coding-system
+ "The universal coding system.")
+
+;; Fixme: some of the cars here aren't valid MIME charsets. That
+;; should only matter with XEmacs, though.
(defvar mm-mime-mule-charset-alist
- '((us-ascii ascii)
+ `((us-ascii ascii)
(iso-8859-1 latin-iso8859-1)
(iso-8859-2 latin-iso8859-2)
(iso-8859-3 latin-iso8859-3)
(iso-8859-4 latin-iso8859-4)
(iso-8859-5 cyrillic-iso8859-5)
- (koi8-r cyrillic-iso8859-5)
+ ;; Non-mule (X)Emacs uses the last mule-charset for 8bit characters.
+ ;; The fake mule-charset, gnus-koi8-r, tells Gnus that the default
+ ;; charset is koi8-r, not iso-8859-5.
+ (koi8-r cyrillic-iso8859-5 gnus-koi8-r)
(iso-8859-6 arabic-iso8859-6)
(iso-8859-7 greek-iso8859-7)
(iso-8859-8 hebrew-iso8859-8)
(iso-8859-9 latin-iso8859-9)
- (iso-2022-jp latin-jisx0201
- japanese-jisx0208-1978 japanese-jisx0208)
+ (iso-8859-14 latin-iso8859-14)
+ (iso-8859-15 latin-iso8859-15)
+ (viscii vietnamese-viscii-lower)
+ (iso-2022-jp latin-jisx0201 japanese-jisx0208 japanese-jisx0208-1978)
(euc-kr korean-ksc5601)
- (cn-gb-2312 chinese-gb2312)
- (cn-big5 chinese-big5-1 chinese-big5-2)
+ (gb2312 chinese-gb2312)
+ (big5 chinese-big5-1 chinese-big5-2)
+ (tibetan tibetan)
+ (thai-tis620 thai-tis620)
+ (iso-2022-7bit ethiopic arabic-1-column arabic-2-column)
(iso-2022-jp-2 latin-iso8859-1 greek-iso8859-7
latin-jisx0201 japanese-jisx0208-1978
chinese-gb2312 japanese-jisx0208
- korean-ksc5601 japanese-jisx0212)
+ korean-ksc5601 japanese-jisx0212
+ katakana-jisx0201)
(iso-2022-int-1 latin-iso8859-1 greek-iso8859-7
latin-jisx0201 japanese-jisx0208-1978
chinese-gb2312 japanese-jisx0208
chinese-cns11643-1 chinese-cns11643-2
chinese-cns11643-3 chinese-cns11643-4
chinese-cns11643-5 chinese-cns11643-6
- chinese-cns11643-7))
+ chinese-cns11643-7)
+ ,(if (or (not (fboundp 'charsetp)) ;; non-Mule case
+ (charsetp 'unicode-a)
+ (not (mm-coding-system-p 'mule-utf-8)))
+ '(utf-8 unicode-a unicode-b unicode-c unicode-d unicode-e)
+ ;; If we have utf-8 we're in Mule 5+.
+ (append '(utf-8)
+ (delete 'ascii
+ (coding-system-get 'mule-utf-8 'safe-charsets)))))
"Alist of MIME-charset/MULE-charsets.")
+;; Correct by construction, but should be unnecessary:
+;; XEmacs hates it.
+(when (and (not (featurep 'xemacs))
+ (fboundp 'coding-system-list)
+ (fboundp 'sort-coding-systems))
+ (setq mm-mime-mule-charset-alist
+ (apply
+ 'nconc
+ (mapcar
+ (lambda (cs)
+ (when (and (coding-system-get cs 'mime-charset)
+ (not (eq t (coding-system-get cs 'safe-charsets))))
+ (list (cons (coding-system-get cs 'mime-charset)
+ (delq 'ascii
+ (coding-system-get cs 'safe-charsets))))))
+ (sort-coding-systems (coding-system-list 'base-only))))))
-(eval-and-compile
- (if (fboundp 'decode-coding-string)
- (fset 'mm-decode-coding-string 'decode-coding-string)
- (fset 'mm-decode-coding-string (lambda (s a) s)))
-
- (if (fboundp 'encode-coding-string)
- (fset 'mm-encode-coding-string 'encode-coding-string)
- (fset 'mm-encode-coding-string (lambda (s a) s)))
-
- (if (fboundp 'encode-coding-region)
- (fset 'mm-encode-coding-region 'encode-coding-region)
- (fset 'mm-encode-coding-region 'ignore))
-
- (if (fboundp 'decode-coding-region)
- (fset 'mm-decode-coding-region 'decode-coding-region)
- (fset 'mm-decode-coding-region 'ignore))
-
- (if (fboundp 'coding-system-list)
- (fset 'mm-coding-system-list 'coding-system-list)
- (fset 'mm-coding-system-list 'ignore))
-
- (if (fboundp 'char-int)
- (fset 'mm-char-int 'char-int)
- (fset 'mm-char-int 'identity))
-
- (if (fboundp 'coding-system-equal)
- (fset 'mm-coding-system-equal 'coding-system-equal)
- (fset 'mm-coding-system-equal 'equal))
-
- (if (fboundp 'read-coding-system)
- (fset 'mm-read-coding-system 'read-coding-system)
- (defun mm-read-coding-system (prompt)
- "Prompt the user for a coding system."
- (completing-read
- prompt (mapcar (lambda (s) (list (symbol-name (car s))))
- mm-mime-mule-charset-alist)))))
-
-
-(defvar mm-charset-coding-system-alist
- (let ((rest
- '((us-ascii . iso-8859-1)
- (gb2312 . cn-gb-2312)
- (iso-2022-jp-2 . iso-2022-7bit-ss2)
- (x-ctext . ctext)))
- (systems (mm-coding-system-list))
- dest)
- (while rest
- (let ((pair (car rest)))
- (unless (memq (car pair) systems)
- (setq dest (cons pair dest))))
- (setq rest (cdr rest)))
- dest)
- "Charset/coding system alist.")
+(defvar mm-hack-charsets '(iso-8859-15 iso-2022-jp-2)
+ "A list of special charsets.
+Valid elements include:
+`iso-8859-15' convert ISO-8859-1, -9 to ISO-8859-15 if ISO-8859-15 exists.
+`iso-2022-jp-2' convert ISO-2022-jp to ISO-2022-jp-2 if ISO-2022-jp-2 exists."
+)
+
+(defvar mm-iso-8859-15-compatible
+ '((iso-8859-1 "\xA4\xA6\xA8\xB4\xB8\xBC\xBD\xBE")
+ (iso-8859-9 "\xA4\xA6\xA8\xB4\xB8\xBC\xBD\xBE\xD0\xDD\xDE\xF0\xFD\xFE"))
+ "ISO-8859-15 exchangeable coding systems and inconvertible characters.")
+
+(defvar mm-iso-8859-x-to-15-table
+ (and (fboundp 'coding-system-p)
+ (mm-coding-system-p 'iso-8859-15)
+ (mapcar
+ (lambda (cs)
+ (if (mm-coding-system-p (car cs))
+ (let ((c (string-to-char
+ (decode-coding-string "\341" (car cs)))))
+ (cons (char-charset c)
+ (cons
+ (- (string-to-char
+ (decode-coding-string "\341" 'iso-8859-15)) c)
+ (string-to-list (decode-coding-string (car (cdr cs))
+ (car cs))))))
+ '(gnus-charset 0)))
+ mm-iso-8859-15-compatible))
+ "A table of the difference character between ISO-8859-X and ISO-8859-15.")
+
+(defvar mm-coding-system-priorities nil
+ "Preferred coding systems for encoding outgoing mails.
+
+More than one suitable coding systems may be found for some texts. By
+default, a coding system with the highest priority is used to encode
+outgoing mails (see `sort-coding-systems'). If this variable is set,
+it overrides the default priority. For example, Japanese users may
+prefer iso-2022-jp to japanese-shift-jis:
+
+\(setq mm-coding-system-priorities
+ '(iso-2022-jp iso-2022-jp-2 japanese-shift-jis utf-8))
+")
+
+(defvar mm-use-find-coding-systems-region
+ (fboundp 'find-coding-systems-region)
+ "Use `find-coding-systems-region' to find proper coding systems.")
+
+;;; Internal variables:
+;;; Functions:
(defun mm-mule-charset-to-mime-charset (charset)
- "Return the MIME charset corresponding to MULE CHARSET."
- (let ((alist mm-mime-mule-charset-alist)
- out)
- (while alist
- (when (memq charset (cdar alist))
- (setq out (caar alist)
- alist nil))
- (pop alist))
- out))
+ "Return the MIME charset corresponding to the given Mule CHARSET."
+ (if (fboundp 'find-coding-systems-for-charsets)
+ (let (mime)
+ (dolist (cs (find-coding-systems-for-charsets (list charset)))
+ (unless mime
+ (when cs
+ (setq mime (coding-system-get cs 'mime-charset)))))
+ mime)
+ (let ((alist mm-mime-mule-charset-alist)
+ out)
+ (while alist
+ (when (memq charset (cdar alist))
+ (setq out (caar alist)
+ alist nil))
+ (pop alist))
+ out)))
(defun mm-charset-to-coding-system (charset &optional lbt)
"Return coding-system corresponding to CHARSET.
used as the line break code type of the coding system."
(when (stringp charset)
(setq charset (intern (downcase charset))))
- (setq charset
- (or (cdr (assq charset mm-charset-coding-system-alist))
- charset))
(when lbt
(setq charset (intern (format "%s-%s" charset lbt))))
(cond
+ ((null charset)
+ charset)
;; Running in a non-MULE environment.
- ((and (null (mm-coding-system-list))
- (memq charset mm-known-charsets))
+ ((null (mm-get-coding-system-list))
charset)
- ;; Check to see whether we can handle this charset.
- ((memq charset (mm-coding-system-list))
+ ;; ascii
+ ((eq charset 'us-ascii)
+ 'ascii)
+ ;; Check to see whether we can handle this charset. (This depends
+ ;; on there being some coding system matching each `mime-charset'
+ ;; property defined, as there should be.)
+ ((and (mm-coding-system-p charset)
+;;; Doing this would potentially weed out incorrect charsets.
+;;; charset
+;;; (eq charset (coding-system-get charset 'mime-charset))
+ )
charset)
- ;; Nope.
+ ;; Translate invalid charsets.
+ ((let ((cs (cdr (assq charset mm-charset-synonym-alist))))
+ (and cs (mm-coding-system-p cs) cs)))
+ ;; Last resort: search the coding system list for entries which
+ ;; have the right mime-charset in case the canonical name isn't
+ ;; defined (though it should be).
+ ((let (cs)
+ ;; mm-get-coding-system-list returns a list of cs without lbt.
+ ;; Do we need -lbt?
+ (dolist (c (mm-get-coding-system-list))
+ (if (and (null cs)
+ (eq charset (coding-system-get c 'mime-charset)))
+ (setq cs c)))
+ cs))))
+
+(defsubst mm-replace-chars-in-string (string from to)
+ (mm-subst-char-in-string from to string))
+
+(eval-and-compile
+ (defvar mm-emacs-mule (and (not (featurep 'xemacs))
+ (boundp 'default-enable-multibyte-characters)
+ default-enable-multibyte-characters
+ (fboundp 'set-buffer-multibyte))
+ "Emacs mule.")
+
+ (defvar mm-mule4-p (and mm-emacs-mule
+ (fboundp 'charsetp)
+ (not (charsetp 'eight-bit-control)))
+ "Mule version 4.")
+
+ (if mm-emacs-mule
+ (defun mm-enable-multibyte ()
+ "Set the multibyte flag of the current buffer.
+Only do this if the default value of `enable-multibyte-characters' is
+non-nil. This is a no-op in XEmacs."
+ (set-buffer-multibyte t))
+ (defalias 'mm-enable-multibyte 'ignore))
+
+ (if mm-emacs-mule
+ (defun mm-disable-multibyte ()
+ "Unset the multibyte flag of in the current buffer.
+This is a no-op in XEmacs."
+ (set-buffer-multibyte nil))
+ (defalias 'mm-disable-multibyte 'ignore))
+
+ (if mm-mule4-p
+ (defun mm-enable-multibyte-mule4 ()
+ "Enable multibyte in the current buffer.
+Only used in Emacs Mule 4."
+ (set-buffer-multibyte t))
+ (defalias 'mm-enable-multibyte-mule4 'ignore))
+
+ (if mm-mule4-p
+ (defun mm-disable-multibyte-mule4 ()
+ "Disable multibyte in the current buffer.
+Only used in Emacs Mule 4."
+ (set-buffer-multibyte nil))
+ (defalias 'mm-disable-multibyte-mule4 'ignore)))
+
+(defun mm-preferred-coding-system (charset)
+ ;; A typo in some Emacs versions.
+ (or (get-charset-property charset 'preferred-coding-system)
+ (get-charset-property charset 'prefered-coding-system)))
+
+(defsubst mm-guess-charset ()
+ "Guess Mule charset from the language environment."
+ (or
+ mail-parse-mule-charset ;; cached mule-charset
+ (progn
+ (setq mail-parse-mule-charset
+ (and (boundp 'current-language-environment)
+ (car (last
+ (assq 'charset
+ (assoc current-language-environment
+ language-info-alist))))))
+ (if (or (not mail-parse-mule-charset)
+ (eq mail-parse-mule-charset 'ascii))
+ (setq mail-parse-mule-charset
+ (or (car (last (assq mail-parse-charset
+ mm-mime-mule-charset-alist)))
+ ;; default
+ 'latin-iso8859-1)))
+ mail-parse-mule-charset)))
+
+(defun mm-charset-after (&optional pos)
+ "Return charset of a character in current buffer at position POS.
+If POS is nil, it defauls to the current point.
+If POS is out of range, the value is nil.
+If the charset is `composition', return the actual one."
+ (let ((char (char-after pos)) charset)
+ (if (< (mm-char-int char) 128)
+ (setq charset 'ascii)
+ ;; charset-after is fake in some Emacsen.
+ (setq charset (and (fboundp 'char-charset) (char-charset char)))
+ (if (eq charset 'composition)
+ (let ((p (or pos (point))))
+ (cadr (find-charset-region p (1+ p))))
+ (if (and charset (not (memq charset '(ascii eight-bit-control
+ eight-bit-graphic))))
+ charset
+ (mm-guess-charset))))))
+
+(defun mm-mime-charset (charset)
+ "Return the MIME charset corresponding to the given Mule CHARSET."
+ (if (eq charset 'unknown)
+ (error "The message contains non-printable characters, please use attachment"))
+ (if (and (fboundp 'coding-system-get) (fboundp 'get-charset-property))
+ ;; This exists in Emacs 20.
+ (or
+ (and (mm-preferred-coding-system charset)
+ (coding-system-get
+ (mm-preferred-coding-system charset) 'mime-charset))
+ (and (eq charset 'ascii)
+ 'us-ascii)
+ (mm-preferred-coding-system charset)
+ (mm-mule-charset-to-mime-charset charset))
+ ;; This is for XEmacs.
+ (mm-mule-charset-to-mime-charset charset)))
+
+(defun mm-delete-duplicates (list)
+ "Simple substitute for CL `delete-duplicates', testing with `equal'."
+ (let (result head)
+ (while list
+ (setq head (car list))
+ (setq list (delete head list))
+ (setq result (cons head result)))
+ (nreverse result)))
+
+(if (and (not (featurep 'xemacs))
+ (boundp 'enable-multibyte-characters))
+ (defalias 'mm-multibyte-p
+ (lambda ()
+ "Say whether multibyte is enabled in the current buffer."
+ enable-multibyte-characters))
+ (defalias 'mm-multibyte-p (lambda () (featurep 'mule))))
+
+(defun mm-iso-8859-x-to-15-region (&optional b e)
+ (if (fboundp 'char-charset)
+ (let (charset item c inconvertible)
+ (save-restriction
+ (if e (narrow-to-region b e))
+ (goto-char (point-min))
+ (skip-chars-forward "\0-\177")
+ (while (not (eobp))
+ (cond
+ ((not (setq item (assq (char-charset (setq c (char-after)))
+ mm-iso-8859-x-to-15-table)))
+ (forward-char))
+ ((memq c (cdr (cdr item)))
+ (setq inconvertible t)
+ (forward-char))
+ (t
+ (insert-before-markers (prog1 (+ c (car (cdr item)))
+ (delete-char 1))))
+ (skip-chars-forward "\0-\177"))))
+ (not inconvertible))))
+
+(defun mm-sort-coding-systems-predicate (a b)
+ (> (length (memq a mm-coding-system-priorities))
+ (length (memq b mm-coding-system-priorities))))
+
+(defun mm-find-mime-charset-region (b e &optional hack-charsets)
+ "Return the MIME charsets needed to encode the region between B and E.
+nil means ASCII, a single-element list represents an appropriate MIME
+charset, and a longer list means no appropriate charset."
+ (let (charsets)
+ ;; The return possibilities of this function are a mess...
+ (or (and (mm-multibyte-p)
+ mm-use-find-coding-systems-region
+ ;; Find the mime-charset of the most preferred coding
+ ;; system that has one.
+ (let ((systems (find-coding-systems-region b e)))
+ (when mm-coding-system-priorities
+ (setq systems
+ (sort systems 'mm-sort-coding-systems-predicate)))
+ ;; Fixme: The `mime-charset' (`x-ctext') of `compound-text'
+ ;; is not in the IANA list.
+ (setq systems (delq 'compound-text systems))
+ (unless (equal systems '(undecided))
+ (while systems
+ (let ((cs (coding-system-get (pop systems) 'mime-charset)))
+ (if cs
+ (setq systems nil
+ charsets (list cs))))))
+ charsets))
+ ;; Otherwise we're not multibyte, XEmacs or a single coding
+ ;; system won't cover it.
+ (setq charsets
+ (mm-delete-duplicates
+ (mapcar 'mm-mime-charset
+ (delq 'ascii
+ (mm-find-charset-region b e))))))
+ (if (and (memq 'iso-8859-15 charsets)
+ (memq 'iso-8859-15 hack-charsets)
+ (save-excursion (mm-iso-8859-x-to-15-region b e)))
+ (mapcar (lambda (x) (setq charsets (delq (car x) charsets)))
+ mm-iso-8859-15-compatible))
+ (if (and (memq 'iso-2022-jp-2 charsets)
+ (memq 'iso-2022-jp-2 hack-charsets))
+ (setq charsets (delq 'iso-2022-jp charsets)))
+ charsets))
+
+(defmacro mm-with-unibyte-buffer (&rest forms)
+ "Create a temporary buffer, and evaluate FORMS there like `progn'.
+Use unibyte mode for this."
+ `(let (default-enable-multibyte-characters)
+ (with-temp-buffer ,@forms)))
+(put 'mm-with-unibyte-buffer 'lisp-indent-function 0)
+(put 'mm-with-unibyte-buffer 'edebug-form-spec '(body))
+
+(defmacro mm-with-unibyte-current-buffer (&rest forms)
+ "Evaluate FORMS with current current buffer temporarily made unibyte.
+Also bind `default-enable-multibyte-characters' to nil.
+Equivalent to `progn' in XEmacs"
+ (let ((multibyte (make-symbol "multibyte"))
+ (buffer (make-symbol "buffer")))
+ `(if mm-emacs-mule
+ (let ((,multibyte enable-multibyte-characters)
+ (,buffer (current-buffer)))
+ (unwind-protect
+ (let (default-enable-multibyte-characters)
+ (set-buffer-multibyte nil)
+ ,@forms)
+ (set-buffer ,buffer)
+ (set-buffer-multibyte ,multibyte)))
+ (let (default-enable-multibyte-characters)
+ ,@forms))))
+(put 'mm-with-unibyte-current-buffer 'lisp-indent-function 0)
+(put 'mm-with-unibyte-current-buffer 'edebug-form-spec '(body))
+
+(defmacro mm-with-unibyte-current-buffer-mule4 (&rest forms)
+ "Evaluate FORMS there like `progn' in current buffer.
+Mule4 only."
+ (let ((multibyte (make-symbol "multibyte"))
+ (buffer (make-symbol "buffer")))
+ `(if mm-mule4-p
+ (let ((,multibyte enable-multibyte-characters)
+ (,buffer (current-buffer)))
+ (unwind-protect
+ (let (default-enable-multibyte-characters)
+ (set-buffer-multibyte nil)
+ ,@forms)
+ (set-buffer ,buffer)
+ (set-buffer-multibyte ,multibyte)))
+ (let (default-enable-multibyte-characters)
+ ,@forms))))
+(put 'mm-with-unibyte-current-buffer-mule4 'lisp-indent-function 0)
+(put 'mm-with-unibyte-current-buffer-mule4 'edebug-form-spec '(body))
+
+(defmacro mm-with-unibyte (&rest forms)
+ "Eval the FORMS with the default value of `enable-multibyte-characters' nil, ."
+ `(let (default-enable-multibyte-characters)
+ ,@forms))
+(put 'mm-with-unibyte 'lisp-indent-function 0)
+(put 'mm-with-unibyte 'edebug-form-spec '(body))
+
+(defun mm-find-charset-region (b e)
+ "Return a list of Emacs charsets in the region B to E."
+ (cond
+ ((and (mm-multibyte-p)
+ (fboundp 'find-charset-region))
+ ;; Remove composition since the base charsets have been included.
+ ;; Remove eight-bit-*, treat them as ascii.
+ (let ((css (find-charset-region b e)))
+ (mapcar (lambda (cs) (setq css (delq cs css)))
+ '(composition eight-bit-control eight-bit-graphic
+ control-1))
+ css))
(t
- nil)))
-
-(defun mm-replace-chars-in-string (string from to)
- "Replace characters in STRING from FROM to TO."
- (let ((string (substring string 0)) ;Copy string.
- (len (length string))
- (idx 0))
- ;; Replace all occurrences of FROM with TO.
- (while (< idx len)
- (when (= (aref string idx) from)
- (aset string idx to))
- (setq idx (1+ idx)))
- string))
-
-(defun mm-enable-multibyte ()
- "Enable multibyte in the current buffer."
- (when (fboundp 'set-buffer-multibyte)
- (set-buffer-multibyte t)))
-
-(defun mm-insert-rfc822-headers (charset encoding)
- "Insert text/plain headers with CHARSET and ENCODING."
- (insert "MIME-Version: 1.0\n")
- (insert "Content-Type: text/plain; charset=\""
- (downcase (symbol-name charset)) "\"\n")
- (insert "Content-Transfer-Encoding: "
- (downcase (symbol-name encoding)) "\n"))
-
-(defun mm-content-type-charset (header)
- "Return the charset parameter from HEADER."
- (when (string-match "charset *= *\"? *\\([-0-9a-zA-Z_]+\\)\"? *$" header)
- (intern (downcase (match-string 1 header)))))
+ ;; We are in a unibyte buffer or XEmacs non-mule, so we futz around a bit.
+ (save-excursion
+ (save-restriction
+ (narrow-to-region b e)
+ (goto-char (point-min))
+ (skip-chars-forward "\0-\177")
+ (if (eobp)
+ '(ascii)
+ (let (charset)
+ (setq charset
+ (and (boundp 'current-language-environment)
+ (car (last (assq 'charset
+ (assoc current-language-environment
+ language-info-alist))))))
+ (if (eq charset 'ascii) (setq charset nil))
+ (or charset
+ (setq charset
+ (car (last (assq mail-parse-charset
+ mm-mime-mule-charset-alist)))))
+ (list 'ascii (or charset 'latin-iso8859-1)))))))))
+
+(if (fboundp 'shell-quote-argument)
+ (defalias 'mm-quote-arg 'shell-quote-argument)
+ (defun mm-quote-arg (arg)
+ "Return a version of ARG that is safe to evaluate in a shell."
+ (let ((pos 0) new-pos accum)
+ ;; *** bug: we don't handle newline characters properly
+ (while (setq new-pos (string-match "[]*[;!'`\"$\\& \t{} |()<>]" arg pos))
+ (push (substring arg pos new-pos) accum)
+ (push "\\" accum)
+ (push (list (aref arg new-pos)) accum)
+ (setq pos (1+ new-pos)))
+ (if (= pos 0)
+ arg
+ (apply 'concat (nconc (nreverse accum) (list (substring arg pos))))))))
+
+(defun mm-auto-mode-alist ()
+ "Return an `auto-mode-alist' with only the .gz (etc) thingies."
+ (let ((alist auto-mode-alist)
+ out)
+ (while alist
+ (when (listp (cdar alist))
+ (push (car alist) out))
+ (pop alist))
+ (nreverse out)))
+
+(defvar mm-inhibit-file-name-handlers
+ '(jka-compr-handler image-file-handler)
+ "A list of handlers doing (un)compression (etc) thingies.")
+
+(defun mm-insert-file-contents (filename &optional visit beg end replace
+ inhibit)
+ "Like `insert-file-contents', q.v., but only reads in the file.
+A buffer may be modified in several ways after reading into the buffer due
+to advanced Emacs features, such as file-name-handlers, format decoding,
+find-file-hooks, etc.
+If INHIBIT is non-nil, inhibit mm-inhibit-file-name-handlers.
+ This function ensures that none of these modifications will take place."
+ (let ((format-alist nil)
+ (auto-mode-alist (if inhibit nil (mm-auto-mode-alist)))
+ (default-major-mode 'fundamental-mode)
+ (enable-local-variables nil)
+ (after-insert-file-functions nil)
+ (enable-local-eval nil)
+ (find-file-hooks nil)
+ (inhibit-file-name-operation (if inhibit
+ 'insert-file-contents
+ inhibit-file-name-operation))
+ (inhibit-file-name-handlers
+ (if inhibit
+ (append mm-inhibit-file-name-handlers
+ inhibit-file-name-handlers)
+ inhibit-file-name-handlers)))
+ (insert-file-contents filename visit beg end replace)))
+
+(defun mm-append-to-file (start end filename &optional codesys inhibit)
+ "Append the contents of the region to the end of file FILENAME.
+When called from a function, expects three arguments,
+START, END and FILENAME. START and END are buffer positions
+saying what text to write.
+Optional fourth argument specifies the coding system to use when
+encoding the file.
+If INHIBIT is non-nil, inhibit mm-inhibit-file-name-handlers."
+ (let ((coding-system-for-write
+ (or codesys mm-text-coding-system-for-write
+ mm-text-coding-system))
+ (inhibit-file-name-operation (if inhibit
+ 'append-to-file
+ inhibit-file-name-operation))
+ (inhibit-file-name-handlers
+ (if inhibit
+ (append mm-inhibit-file-name-handlers
+ inhibit-file-name-handlers)
+ inhibit-file-name-handlers)))
+ (append-to-file start end filename)))
+
+(defun mm-write-region (start end filename &optional append visit lockname
+ coding-system inhibit)
+
+ "Like `write-region'.
+If INHIBIT is non-nil, inhibit mm-inhibit-file-name-handlers."
+ (let ((coding-system-for-write
+ (or coding-system mm-text-coding-system-for-write
+ mm-text-coding-system))
+ (inhibit-file-name-operation (if inhibit
+ 'write-region
+ inhibit-file-name-operation))
+ (inhibit-file-name-handlers
+ (if inhibit
+ (append mm-inhibit-file-name-handlers
+ inhibit-file-name-handlers)
+ inhibit-file-name-handlers)))
+ (write-region start end filename append visit lockname)))
+
+(defun mm-image-load-path (&optional package)
+ (let (dir result)
+ (dolist (path load-path (nreverse result))
+ (if (file-directory-p
+ (setq dir (concat (file-name-directory
+ (directory-file-name path))
+ "etc/" (or package "gnus/"))))
+ (push dir result))
+ (push path result))))
+
+(if (fboundp 'detect-coding-region)
+ (defun mm-detect-coding-region (start end)
+ "Like 'detect-coding-region' except returning the best one."
+ (let ((coding-systems
+ (detect-coding-region (point) (point-max))))
+ (or (car-safe coding-systems)
+ coding-systems)))
+ (defun mm-detect-coding-region (start end)
+ (let ((point (point)))
+ (goto-char start)
+ (skip-chars-forward "\0-\177" end)
+ (prog1
+ (if (eq (point) end) 'ascii (mm-guess-charset))
+ (goto-char point)))))
+
+(if (fboundp 'coding-system-get)
+ (defun mm-detect-mime-charset-region (start end)
+ "Detect MIME charset of the text in the region between START and END."
+ (let ((cs (mm-detect-coding-region start end)))
+ (coding-system-get cs 'mime-charset)))
+ (defun mm-detect-mime-charset-region (start end)
+ "Detect MIME charset of the text in the region between START and END."
+ (let ((cs (mm-detect-coding-region start end)))
+ cs)))
(provide 'mm-util)
projects / elisp / gnus.git- / blobdiff