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[xemacs-hg @ 2002-05-16 13:30:23 by ben] ui fixes for things that were bothering me bytecode.c, editfns.c, lisp.h, lread.c: Fix save-restriction to use markers rather than pseudo-markers (integers representing the amount of text on either side of the region). That way, all inserts are handled correctly, not just those inside old restriction. Add buffer argument to save_restriction_save(). process.c: Clean up very dirty and kludgy code that outputs into a buffer -- use proper unwind protects, etc. font-lock.c: Do save-restriction/widen around the function -- otherwise, incorrect results will ensue when a buffer has been narrowed before a call to e.g. `buffer-syntactic-context' -- something that happens quite often. fileio.c: Look for a handler for make-temp-name. window.c, winslots.h: Try to solve this annoying problem: have two frames displaying the buffer, in different places; in one, temporarily switch away to another buffer and then back -- and you've lost your position; it's reset to the other one in the other frame. My current solution involves window-level caches of buffers and points (also a cache for window-start); when set-window-buffer is called, it looks to see if the buffer was previously visited in the window, and if so, uses the most recent point at that time. (It's a marker, so it handles changes.) #### Note: It could be argued that doing it on the frame level would be better -- e.g. if you visit a buffer temporarily through a grep, and then go back to that buffer, you presumably want the grep's position rather than some previous position provided everything was in the same frame, even though the grep was in another window in the frame. However, doing it on the frame level fails when you have two windows on the same frame. Perhaps we keep both a window and a frame cache, and use the frame cache if there are no other windows on the frame showing the buffer, else the window's cache? This is probably something to be configurable using a specifier. Suggestions please please please? window.c: Clean up a bit code that deals with the annoyance of window-point vs. point. dialog.el: Function to ask a multiple-choice question, automatically choosing a dialog box or minibuffer representation as necessary. Generalized version of yes-or-no-p, y-or-n-p. files.el: Use get-user-response to ask "yes/no/diff" question when recovering. "diff" means that a diff is displayed between the current file and the autosave. (Converts/deconverts escape-quoted as necessary. No more complaints from you, Mr. Turnbull!) One known problem: when a dialog is used, it's modal, so you can't scroll the diff. Will fix soon. lisp-mode.el: If we're filling a string, don't treat semicolon as a comment, which would give very unfriendly results. Uses `buffer-syntactic-context'. simple.el: all changes back to the beginning. (Useful if you've saved the file in the middle of the changes.) simple.el: Add option kill-word-into-kill-ring, which controls whether words deleted with kill-word, backward-kill-word, etc. are "cut" into the kill ring, or "cleared" into nothingness. (My preference is the latter, by far. I'd almost go so far as suggesting we make it the default, as you can always select a word and then cut it if you want it cut.) menubar-items.el: Add option corresponding to kill-word-into-kill-ring.
author ben
date Thu, 16 May 2002 13:30:58 +0000
parents 943eaba38521
children b531bf8658e9
line wrap: on
line source

;;; code-cmds.el --- Commands for manipulating coding systems.

;; Copyright (C) 1995,1999 Electrotechnical Laboratory, JAPAN.
;; Licensed to the Free Software Foundation.
;; Copyright (C) 2000 Free Software Foundation
;; Copyright (C) 1997 MORIOKA Tomohiko
;; Copyright (C) 2001, 2002 Ben Wing.


;; This file is part of XEmacs.

;; XEmacs 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.

;; XEmacs 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 XEmacs; see the file COPYING.  If not, write to the Free
;; Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
;; 02111-1307, USA.

;;
;; This code defines the keybindings and utility commands for the
;; user to manipulate coding systems.
;; This code used to be in mule-cmds.el which now only needs the
;; additional bindings/commands that are avaible on the real mule.


;;; Code:

;;; Coding related key bindings and menus.

(defvar coding-keymap (make-sparse-keymap "Coding+Mule")
  "Keymap for coding-system-specific and (when available) Mule commands.")

;; Keep "C-x C-m ..." for coding/mule specific commands.
(define-key ctl-x-map "\C-m" coding-keymap)

(define-key coding-keymap "f" 'set-buffer-file-coding-system)
(define-key coding-keymap "F" 'set-default-buffer-file-coding-system) ; XEmacs
(define-key coding-keymap "t" 'set-terminal-coding-system)
(define-key coding-keymap "p" 'set-buffer-process-coding-system)
(define-key coding-keymap "c" 'universal-coding-system-argument)
;;(define-key coding-keymap "c" 'list-coding-system-briefly) ; XEmacs
(when-fboundp 'describe-coding-system
  (define-key coding-keymap "C" 'describe-coding-system))	 ; XEmacs
(when-fboundp 'set-selection-coding-system
  (define-key coding-keymap "x" 'set-selection-coding-system)
  (define-key coding-keymap "X" 'set-next-selection-coding-system))


(defun coding-system-change-eol-conversion (coding-system eol-type)
  "Return a coding system which differs from CODING-SYSTEM in eol conversion.
The returned coding system converts end-of-line by EOL-TYPE
but text as the same way as CODING-SYSTEM.
EOL-TYPE should be `lf', `crlf', `cr' or nil.
If EOL-TYPE is nil, the returned coding system detects
how end-of-line is formatted automatically while decoding.

EOL-TYPE can be specified by an symbol `unix', `dos' or `mac'.
They means `lf', `crlf', and `cr' respectively."
  (if (symbolp eol-type)
      (setq eol-type (cond ((or (eq eol-type 'unix)
				(eq eol-type 'lf))
			    'eol-lf)
                           ((or (eq eol-type 'dos)
				(eq eol-type 'crlf))
			    'eol-crlf)
                           ((or (eq eol-type 'mac)
				(eq eol-type 'cr))
			    'eol-cr)
                           (t eol-type))))
  (let ((orig-eol-type (coding-system-eol-type coding-system)))
    (if (null orig-eol-type)
        (if (not eol-type)
            coding-system
          (coding-system-property coding-system eol-type))
      (let ((base (coding-system-base coding-system)))
        (if (not eol-type)
            base
          (if (eq eol-type orig-eol-type)
              coding-system
            (setq orig-eol-type (coding-system-eol-type base))
            (if (null orig-eol-type)
                (coding-system-property base eol-type))))))))

;; (defun coding-system-change-text-conversion (coding-system coding)
;;   "Return a coding system which differs from CODING-SYSTEM in text conversion.
;; The returned coding system converts text by CODING
;; but end-of-line as the same way as CODING-SYSTEM.
;; If CODING is nil, the returned coding system detects
;; how text is formatted automatically while decoding."
;;   (if (not coding)
;;       (coding-system-base coding-system)
;;     (let ((eol-type (coding-system-eol-type coding-system)))
;;       (coding-system-change-eol-conversion
;;        coding
;;        (if (numberp eol-type) (aref [unix dos mac] eol-type))))))

(defun universal-coding-system-argument ()
  "Execute an I/O command using the specified coding system."
  (interactive)
  (let* ((default (and buffer-file-coding-system
		       (not (eq (coding-system-type buffer-file-coding-system)
				t))
		       (coding-system-name buffer-file-coding-system)))
	 (coding-system
	  (read-coding-system
	   (if default
	       (format "Coding system for following command (default, %s): "
		       default)
	     "Coding system for following command: ")
	   default))
	 (keyseq (read-key-sequence
		  (format "Command to execute with %s:" coding-system)))
	 (cmd (key-binding keyseq)))
    (let ((coding-system-for-read coding-system)
	  (coding-system-for-write coding-system))
      (message "")
      (call-interactively cmd))))

(defun set-default-output-coding-systems (coding-system)
  "Set default value for coding system output to CODING-SYSTEM.
This sets the coding system of newly created buffers (the default value of
`buffer-file-coding-system') and the default coding system for output to a
subprocess (the CDR of `default-process-coding-system').

Other defaults are not changed; see `prefer-coding-system' for why."
  (check-coding-system coding-system)
  (set-default-buffer-file-coding-system coding-system)
  (setq default-process-coding-system
	(cons (car default-process-coding-system) coding-system)))

(defun prefer-coding-system (coding-system)
  "Add CODING-SYSTEM at the front of the priority list for automatic detection.
This also sets the coding system of newly created buffers (the default
value of `buffer-file-coding-system') and the default coding system for
output to a subprocess (the CDR of `default-process-coding-system').

If CODING-SYSTEM specifies a certain type of EOL conversion, the coding
systems set by this function will use that type of EOL conversion.

This does not change the default coding system for converting file names
because that is dependent on the current locale; it's changed when
`set-language-environment' is called.  It does not change
`terminal-coding-system' or `keyboard-coding-system'; they should get set
when the terminal is opened (and are typically an inherent property of the
terminal), and don't change afterward.  It does not change the default
coding system for reading files or input from a subprocess; they should
remain as `undecided' so that automatic detection is done."
  (interactive "zPrefer coding system: ")
  (if (not (and coding-system (find-coding-system coding-system)))
      (error "Invalid coding system `%s'" coding-system))
  (let ((coding-category (coding-system-category coding-system))
	(base (coding-system-base coding-system))
	(eol-type (coding-system-eol-type coding-system)))
    (if (not coding-category)
	;; CODING-SYSTEM is no-conversion or undecided.
	(error "Can't prefer the coding system `%s'" coding-system))
    (set-coding-category-system coding-category (or base coding-system))
    ;; (update-coding-systems-internal)
    (or (eq coding-category (car (coding-category-list)))
	;; We must change the order.
	(set-coding-priority-list (list coding-category)))
    (if (and base (interactive-p))
	(message "Highest priority is set to %s (base of %s)"
		 base coding-system))
    ;; If they asked for specific EOL conversion, honor that.
    (if (memq eol-type '(lf crlf cr unix dos mac))
	(setq coding-system
	      (coding-system-change-eol-conversion base eol-type))
      (setq coding-system base))
    (set-default-output-coding-systems coding-system)))

;; (defun find-coding-systems-region-subset-p (list1 list2)
;;   "Return non-nil if all elements in LIST1 are included in LIST2.
;; Comparison done with EQ."
;;   (catch 'tag
;;     (while list1
;;       (or (memq (car list1) list2)
;;           (throw 'tag nil))
;;       (setq list1 (cdr list1)))
;;     t))

;; (defun find-coding-systems-region (from to)
;;   "Return a list of proper coding systems to encode a text between FROM and TO.
;; All coding systems in the list can safely encode any multibyte characters
;; in the text.
;; 
;; If the text contains no multibyte characters, return a list of a single
;; element `undecided'."
;;   (find-coding-systems-for-charsets (find-charset-region from to)))

;; (defun find-coding-systems-string (string)
;;   "Return a list of proper coding systems to encode STRING.
;; All coding systems in the list can safely encode any multibyte characters
;; in STRING.
;; 
;; If STRING contains no multibyte characters, return a list of a single
;; element `undecided'."
;;   (find-coding-systems-for-charsets (find-charset-string string)))

;; (defun find-coding-systems-for-charsets (charsets)
;;   "Return a list of proper coding systems to encode characters of CHARSETS.
;; CHARSETS is a list of character sets."
;;   (if (or (null charsets)
;;           (and (= (length charsets) 1)
;;                (eq 'ascii (car charsets))))
;;       '(undecided)
;;     (setq charsets (delq 'composition charsets))
;;     (let ((l (coding-system-list 'base-only))
;;           (charset-preferred-codings
;;            (mapcar (function
;;                     (lambda (x)
;;                       (if (eq x 'unknown)
;;                           'raw-text
;;                         (get-charset-property x 'preferred-coding-system))))
;;                    charsets))
;;           (priorities (mapcar (function (lambda (x) (symbol-value x)))
;;                               coding-category-list))
;;           codings coding safe)
;;       (if (memq 'unknown charsets)
;;           ;; The region contains invalid multibyte characters.
;;           (setq l '(raw-text)))
;;       (while l
;;         (setq coding (car l) l (cdr l))
;;         (if (and (setq safe (coding-system-get coding 'safe-charsets))
;;                  (or (eq safe t)
;;                      (find-coding-systems-region-subset-p charsets safe)))
;;             ;; We put the higher priority to coding systems included
;;             ;; in CHARSET-PREFERRED-CODINGS, and within them, put the
;;             ;; higher priority to coding systems which support smaller
;;             ;; number of charsets.
;;             (let ((priority
;;                    (+ (if (coding-system-get coding 'mime-charset) 4096 0)
;;                       (lsh (length (memq coding priorities)) 7)
;;                       (if (memq coding charset-preferred-codings) 64 0)
;;                       (if (> (coding-system-type coding) 0) 32 0)
;;                       (if (consp safe) (- 32 (length safe)) 0))))
;;               (setq codings (cons (cons priority coding) codings)))))
;;       (mapcar 'cdr
;;               (sort codings (function (lambda (x y) (> (car x) (car y))))))
;;       )))

;; (defun find-multibyte-characters (from to &optional maxcount excludes)
;;   "Find multibyte characters in the region specified by FROM and TO.
;; If FROM is a string, find multibyte characters in the string.
;; The return value is an alist of the following format:
;;   ((CHARSET COUNT CHAR ...) ...)
;; where
;;   CHARSET is a character set,
;;   COUNT is a number of characters,
;;   CHARs are found characters of the character set.
;; Optional 3rd arg MAXCOUNT limits how many CHARs are put in the above list.
;; Optional 4th arg EXCLUDE is a list of character sets to be ignored.
;; 
;; For invalid characters, CHARs are actually strings."
;;   (let ((chars nil)
;;         charset char)
;;     (if (stringp from)
;;         (let ((idx 0))
;;           (while (setq idx (string-match "[^\000-\177]" from idx))
;;             (setq char (aref from idx)
;;                   charset (char-charset char))
;;             (if (eq charset 'unknown)
;;                 (setq char (match-string 0)))
;;             (if (or (eq charset 'unknown)
;;                     (not (or (eq excludes t) (memq charset excludes))))
;;                 (let ((slot (assq charset chars)))
;;                   (if slot
;;                       (if (not (memq char (nthcdr 2 slot)))
;;                           (let ((count (nth 1 slot)))
;;                             (setcar (cdr slot) (1+ count))
;;                             (if (or (not maxcount) (< count maxcount))
;;                                 (nconc slot (list char)))))
;;                     (setq chars (cons (list charset 1 char) chars)))))
;;             (setq idx (1+ idx))))
;;       (save-excursion
;;         (goto-char from)
;;         (while (re-search-forward "[^\000-\177]" to t)
;;           (setq char (preceding-char)
;;                 charset (char-charset char))
;;           (if (eq charset 'unknown)
;;               (setq char (match-string 0)))
;;           (if (or (eq charset 'unknown)
;;                   (not (or (eq excludes t) (memq charset excludes))))
;;               (let ((slot (assq charset chars)))
;;                 (if slot
;;                     (if (not (member char (nthcdr 2 slot)))
;;                         (let ((count (nth 1 slot)))
;;                           (setcar (cdr slot) (1+ count))
;;                           (if (or (not maxcount) (< count maxcount))
;;                               (nconc slot (list char)))))
;;                   (setq chars (cons (list charset 1 char) chars))))))))
;;     (nreverse chars)))

;; (defvar last-coding-system-specified nil
;;   "Most recent coding system explicitly specified by the user when asked.
;; This variable is set whenever Emacs asks the user which coding system
;; to use in order to write a file.  If you set it to nil explicitly,
;; then call `write-region', then afterward this variable will be non-nil
;; only if the user was explicitly asked and specified a coding system.")

;; (defun select-safe-coding-system (from to &optional default-coding-system)
;;   "Ask a user to select a safe coding system from candidates.
;; The candidates of coding systems which can safely encode a text
;; between FROM and TO are shown in a popup window.
;; 
;; Optional arg DEFAULT-CODING-SYSTEM specifies a coding system to be
;; checked at first.  If omitted, buffer-file-coding-system of the
;; current buffer is used.
;; 
;; If the text can be encoded safely by DEFAULT-CODING-SYSTEM, it is
;; returned without any user interaction.
;; 
;; Kludgy feature: if FROM is a string, the string is the target text,
;; and TO is ignored."
;;   (or default-coding-system
;;       (setq default-coding-system buffer-file-coding-system))
;;   (let* ((charsets (if (stringp from) (find-charset-string from)
;;                      (find-charset-region from to)))
;;          (safe-coding-systems (find-coding-systems-for-charsets charsets)))
;;     (if (or (not enable-multibyte-characters)
;;             (eq (car safe-coding-systems) 'undecided)
;;             (eq default-coding-system 'no-conversion)
;;             (and default-coding-system
;;                  (memq (coding-system-base default-coding-system)
;;                        safe-coding-systems)))
;;         default-coding-system
;; 
;;       ;; At first, change each coding system to the corresponding
;;       ;; mime-charset name if it is also a coding system.
;;       (let ((l safe-coding-systems)
;;             mime-charset)
;;         (while l
;;           (setq mime-charset (coding-system-get (car l) 'mime-charset))
;;           (if (and mime-charset (coding-system-p mime-charset))
;;               (setcar l mime-charset))
;;           (setq l (cdr l))))
;; 
;;       (let ((non-safe-chars (find-multibyte-characters
;;                              from to 3
;;                              (and default-coding-system
;;                                   (coding-system-get default-coding-system
;;                                                      'safe-charsets))))
;;             show-position overlays)
;;         (save-excursion
;;           ;; Highlight characters that default-coding-system can't encode.
;;           (when (integerp from)
;;             (goto-char from)
;;             (let ((found nil))
;;               (while (and (not found)
;;                           (re-search-forward "[^\000-\177]" to t))
;;                 (setq found (assq (char-charset (preceding-char))
;;                                   non-safe-chars))))
;;             (forward-line -1)
;;             (setq show-position (point))
;;             (save-excursion
;;               (while (and (< (length overlays) 256)
;;                           (re-search-forward "[^\000-\177]" to t))
;;                 (let* ((char (preceding-char))
;;                        (charset (char-charset char)))
;;                   (when (assq charset non-safe-chars)
;;                     (setq overlays (cons (make-overlay (1- (point)) (point))
;;                                          overlays))
;;                     (overlay-put (car overlays) 'face 'highlight))))))
;; 
;;           ;; At last, ask a user to select a proper coding system.  
;;           (unwind-protect
;;               (save-window-excursion
;;                 (when show-position
;;                   ;; At first, be sure to show the current buffer.
;;                   (set-window-buffer (selected-window) (current-buffer))
;;                   (set-window-start (selected-window) show-position))
;;                 ;; Then, show a helpful message.
;;                 (with-output-to-temp-buffer "*Warning*"
;;                   (save-excursion
;;                     (set-buffer standard-output)
;;                     (insert "The target text contains the following non ASCII character(s):\n")
;;                     (let ((len (length non-safe-chars))
;;                           (shown 0))
;;                       (while (and non-safe-chars (< shown 3))
;;                         (when (> (length (car non-safe-chars)) 2)
;;                           (setq shown (1+ shown))
;;                           (insert (format "%25s: " (car (car non-safe-chars))))
;;                           (let ((l (nthcdr 2 (car non-safe-chars))))
;;                             (while l
;;                               (if (or (stringp (car l)) (char-valid-p (car l)))
;;                                   (insert (car l)))
;;                               (setq l (cdr l))))
;;                           (if (> (nth 1 (car non-safe-chars)) 3)
;;                               (insert "..."))
;;                           (insert "\n"))
;;                         (setq non-safe-chars (cdr non-safe-chars)))
;;                       (if (< shown len)
;;                           (insert (format "%27s\n" "..."))))
;;                     (insert (format "\
;; These can't be encoded safely by the coding system %s.
;; 
;; Please select one from the following safe coding systems:\n"
;;                                     default-coding-system))
;;                     (let ((pos (point))
;;                           (fill-prefix "  "))
;;                       (mapcar (function (lambda (x) (princ "  ") (princ x)))
;;                               safe-coding-systems)
;;                       (fill-region-as-paragraph pos (point)))))
;; 
;;                 ;; Read a coding system.
;;                 (let* ((safe-names (mapcar (lambda (x) (list (symbol-name x)))
;;                                            safe-coding-systems))
;;                        (name (completing-read
;;                               (format "Select coding system (default %s): "
;;                                       (car safe-coding-systems))
;;                               safe-names nil t nil nil
;;                               (car (car safe-names)))))
;;                   (setq last-coding-system-specified (intern name))
;;                   (if (integerp (coding-system-eol-type default-coding-system))
;;                       (setq last-coding-system-specified
;;                             (coding-system-change-eol-conversion
;;                              last-coding-system-specified
;;                              (coding-system-eol-type default-coding-system))))
;;                   last-coding-system-specified))
;;             (kill-buffer "*Warning*")
;;             (while overlays
;;               (delete-overlay (car overlays))
;;               (setq overlays (cdr overlays)))))))))

;; (setq select-safe-coding-system-function 'select-safe-coding-system)

;; (defun select-message-coding-system ()
;;   "Return a coding system to encode the outgoing message of the current buffer.
;; It at first tries the first coding system found in these variables
;; in this order:
;;   (1) local value of `buffer-file-coding-system'
;;   (2) value of `sendmail-coding-system'
;;   (3) value of `default-buffer-file-coding-system'
;;   (4) value of `default-sendmail-coding-system'
;; If the found coding system can't encode the current buffer,
;; or none of them are bound to a coding system,
;; it asks the user to select a proper coding system."
;;   (let ((coding (or (and (local-variable-p 'buffer-file-coding-system)
;;                          buffer-file-coding-system)
;;                     sendmail-coding-system
;;                     default-buffer-file-coding-system
;;                     default-sendmail-coding-system)))
;;     (if (eq coding 'no-conversion)
;;         ;; We should never use no-conversion for outgoing mails.
;;         (setq coding nil))
;;     (if (fboundp select-safe-coding-system-function)
;;         (funcall select-safe-coding-system-function
;;                  (point-min) (point-max) coding)
;;       coding)))

(provide 'code-cmds)

;;; code-cmds.el ends here