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- ;;; enriched.el --- read and save files in text/enriched format
-
- ;; Copyright (c) 1994, 1995, 1996 Free Software Foundation, Inc.
-
- ;; XEmacs version: Mike Sperber <sperber@informatik.uni-tuebingen.de>
- ;; Original author: Boris Goldowsky <boris@gnu.ai.mit.edu>
- ;; Keywords: wp, faces
-
- ;; 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.
-
- ;;; Synched up with: FSF 20.2.
-
- ;;; Commentary:
-
- ;; This file implements reading, editing, and saving files with
- ;; text-properties such as faces, levels of indentation, and true line
- ;; breaks distinguished from newlines just used to fit text into the window.
-
- ;; The file format used is the MIME text/enriched format, which is a
- ;; standard format defined in internet RFC 1563. All standard annotations
- ;; are supported except for <smaller> and <bigger>, which are currently not
- ;; possible to display.
-
- ;; A separate file, enriched.doc, contains further documentation and other
- ;; important information about this code. It also serves as an example
- ;; file in text/enriched format. It should be in the etc directory of your
- ;; emacs distribution.
-
- ;;; TODO for the XEmacs port:
- ;;
- ;; Currently XEmacs does not support default-text-properties. The
- ;; original enriched.el uses this to set the left-margin,
- ;; right-margin, and justification properties to 'front-sticky.
- ;; If you know the Right Way to fix this, contact
- ;; Mike Sperber <sperber@informatik.uni-tuebingen.de>.
-
- ;;; Code:
-
- (provide 'enriched)
-
- ;;;
- ;;; Variables controlling the display
- ;;;
-
- (defgroup enriched nil
- "Read and save files in text/enriched format"
- :group 'wp)
-
- (defcustom enriched-verbose t
- "*If non-nil, give status messages when reading and writing files."
- :type 'boolean
- :group 'enriched)
-
- ;;;
- ;;; Set up faces & display table
- ;;;
-
- ;; Emacs doesn't have a "fixed" face by default, since all faces currently
- ;; have to be fixed-width. So we just pick one that looks different from the
- ;; default.
- (defface fixed
- '((t (:bold t)))
- "Face used for text that must be shown in fixed width.
- Currently, emacs can only display fixed-width fonts, but this may change.
- This face is used for text specifically marked as fixed-width, for example
- in text/enriched files."
- :group 'enriched)
-
- (defface excerpt
- '((t (:italic t)))
- "Face used for text that is an excerpt from another document.
- This is used in enriched-mode for text explicitly marked as an excerpt."
- :group 'enriched)
-
- (defconst enriched-display-table
- ;; XEmacs change
- ;; (or (copy-sequence standard-display-table)
- ;; (make-display-table)))
- (make-display-table))
- (aset enriched-display-table ?\f (make-vector (1- (frame-width)) ?-))
-
- (defconst enriched-par-props '(left-margin right-margin justification)
- "Text-properties that usually apply to whole paragraphs.
- These are set front-sticky everywhere except at hard newlines.")
-
- ;;;
- ;;; Variables controlling the file format
- ;;; (bidirectional)
-
- (defconst enriched-initial-annotation
- (lambda ()
- (format "Content-Type: text/enriched\nText-Width: %d\n\n"
- fill-column))
- "What to insert at the start of a text/enriched file.
- If this is a string, it is inserted. If it is a list, it should be a lambda
- expression, which is evaluated to get the string to insert.")
-
- (defconst enriched-annotation-format "<%s%s>"
- "General format of enriched-text annotations.")
-
- (defconst enriched-annotation-regexp "<\\(/\\)?\\([-A-za-z0-9]+\\)>"
- "Regular expression matching enriched-text annotations.")
-
- (defconst enriched-translations
- '((face (bold-italic "bold" "italic")
- (bold "bold")
- (italic "italic")
- (underline "underline")
- (fixed "fixed")
- (excerpt "excerpt")
- (default )
- (nil enriched-encode-other-face))
- (left-margin (4 "indent"))
- (right-margin (4 "indentright"))
- (justification (none "nofill")
- (right "flushright")
- (left "flushleft")
- (full "flushboth")
- (center "center"))
- (PARAMETER (t "param")) ; Argument of preceding annotation
- ;; The following are not part of the standard:
- (FUNCTION (enriched-decode-foreground "x-color")
- (enriched-decode-background "x-bg-color")
- ;; XEmacs addition
- (facemenu-make-larger "bigger")
- (facemenu-make-smaller "smaller"))
- (read-only (t "x-read-only"))
- (unknown (nil format-annotate-value))
- ; (font-size (2 "bigger") ; unimplemented
- ; (-2 "smaller"))
- )
- "List of definitions of text/enriched annotations.
- See `format-annotate-region' and `format-deannotate-region' for the definition
- of this structure.")
-
- (defconst enriched-ignore
- '(front-sticky rear-nonsticky hard)
- "Properties that are OK to ignore when saving text/enriched files.
- Any property that is neither on this list nor dealt with by
- `enriched-translations' will generate a warning.")
-
- ;;; Internal variables
-
- (defvar enriched-mode nil
- "True if Enriched mode is in use.")
- (make-variable-buffer-local 'enriched-mode)
-
- (if (not (assq 'enriched-mode minor-mode-alist))
- (setq minor-mode-alist
- (cons '(enriched-mode " Enriched")
- minor-mode-alist)))
-
- (defcustom enriched-mode-hook nil
- "Functions to run when entering Enriched mode.
- If you set variables in this hook, you should arrange for them to be restored
- to their old values if you leave Enriched mode. One way to do this is to add
- them and their old values to `enriched-old-bindings'."
- :type 'hook
- :group 'enriched)
-
- (defvar enriched-old-bindings nil
- "Store old variable values that we change when entering mode.
- The value is a list of \(VAR VALUE VAR VALUE...).")
- (make-variable-buffer-local 'enriched-old-bindings)
-
- ;;;
- ;;; Define the mode
- ;;;
-
- ;;;###autoload
- (defun enriched-mode (&optional arg)
- "Minor mode for editing text/enriched files.
- These are files with embedded formatting information in the MIME standard
- text/enriched format.
- Turning the mode on runs `enriched-mode-hook'.
-
- More information about Enriched mode is available in the file
- etc/enriched.doc in the Emacs distribution directory.
-
- Commands:
-
- \\<enriched-mode-map>\\{enriched-mode-map}"
- (interactive "P")
- (let ((mod (buffer-modified-p)))
- (cond ((or (<= (prefix-numeric-value arg) 0)
- (and enriched-mode (null arg)))
- ;; Turn mode off
- (setq enriched-mode nil)
- (setq buffer-file-format (delq 'text/enriched buffer-file-format))
- ;; restore old variable values
- (while enriched-old-bindings
- (funcall 'set (car enriched-old-bindings)
- (car (cdr enriched-old-bindings)))
- (setq enriched-old-bindings (cdr (cdr enriched-old-bindings)))))
-
- (enriched-mode nil) ; Mode already on; do nothing.
-
- (t (setq enriched-mode t) ; Turn mode on
- (add-to-list 'buffer-file-format 'text/enriched)
- ;; Save old variable values before we change them.
- ;; These will be restored if we exit Enriched mode.
- (setq enriched-old-bindings
- ;; XEmacs change
- (list ; 'buffer-display-table buffer-display-table
- 'indent-line-function indent-line-function
- 'default-text-properties default-text-properties))
- (make-local-variable 'indent-line-function)
- (make-local-variable 'default-text-properties)
- (setq indent-line-function 'indent-to-left-margin
- ;; XEmacs change
- ;; buffer-display-table enriched-display-table
- )
- (use-hard-newlines 1 nil)
- (let ((sticky (plist-get default-text-properties 'front-sticky))
- (p enriched-par-props))
- (while p
- (add-to-list 'sticky (car p))
- (setq p (cdr p)))
- (if sticky
- (setq default-text-properties
- (plist-put default-text-properties
- 'front-sticky sticky))))
- (run-hooks 'enriched-mode-hook)))
- (set-buffer-modified-p mod)
- ;; XEmacs change
- (redraw-modeline)))
-
- ;;;
- ;;; Keybindings
- ;;;
-
- (defvar enriched-mode-map nil
- "Keymap for Enriched mode.")
-
- (if (null enriched-mode-map)
- (fset 'enriched-mode-map (setq enriched-mode-map (make-sparse-keymap))))
-
- (if (not (assq 'enriched-mode minor-mode-map-alist))
- (setq minor-mode-map-alist
- (cons (cons 'enriched-mode enriched-mode-map)
- minor-mode-map-alist)))
-
- (define-key enriched-mode-map "\C-a" 'beginning-of-line-text)
- (define-key enriched-mode-map "\C-m" 'reindent-then-newline-and-indent)
- (define-key enriched-mode-map "\C-j" 'reindent-then-newline-and-indent)
- (define-key enriched-mode-map "\M-j" 'facemenu-justification-menu)
- (define-key enriched-mode-map "\M-S" 'set-justification-center)
- (define-key enriched-mode-map "\C-x\t" 'increase-left-margin)
- (define-key enriched-mode-map "\C-c\C-l" 'set-left-margin)
- (define-key enriched-mode-map "\C-c\C-r" 'set-right-margin)
-
- ;;;
- ;;; Some functions dealing with text-properties, especially indentation
- ;;;
-
- (defun enriched-map-property-regions (prop func &optional from to)
- "Apply a function to regions of the buffer based on a text property.
- For each contiguous region of the buffer for which the value of PROPERTY is
- eq, the FUNCTION will be called. Optional arguments FROM and TO specify the
- region over which to scan.
-
- The specified function receives three arguments: the VALUE of the property in
- the region, and the START and END of each region."
- (save-excursion
- (save-restriction
- (if to (narrow-to-region (point-min) to))
- (goto-char (or from (point-min)))
- (let ((begin (point))
- end
- (marker (make-marker))
- (val (get-text-property (point) prop)))
- (while (setq end (text-property-not-all begin (point-max) prop val))
- (move-marker marker end)
- (funcall func val begin (marker-position marker))
- (setq begin (marker-position marker)
- val (get-text-property marker prop)))
- (if (< begin (point-max))
- (funcall func val begin (point-max)))))))
-
- (put 'enriched-map-property-regions 'lisp-indent-hook 1)
-
- (defun enriched-insert-indentation (&optional from to)
- "Indent and justify each line in the region."
- (save-excursion
- (save-restriction
- (if to (narrow-to-region (point-min) to))
- (goto-char (or from (point-min)))
- (if (not (bolp)) (forward-line 1))
- (while (not (eobp))
- (if (eolp)
- nil ; skip blank lines
- (indent-to (current-left-margin))
- (justify-current-line t nil t))
- (forward-line 1)))))
-
- ;;;
- ;;; Encoding Files
- ;;;
-
- ;;;###autoload
- (defun enriched-encode (from to &optional orig-buf)
- (if enriched-verbose (message "Enriched: encoding document..."))
- (save-restriction
- (narrow-to-region from to)
- (delete-to-left-margin)
- (unjustify-region)
- (goto-char from)
- (format-replace-strings '(("<" . "<<")))
- (format-insert-annotations
- (format-annotate-region from (point-max) enriched-translations
- 'enriched-make-annotation enriched-ignore))
- (goto-char from)
- (insert (if (stringp enriched-initial-annotation)
- enriched-initial-annotation
- (save-excursion
- ;; Eval this in the buffer we are annotating. This
- ;; fixes a bug which was saving incorrect File-Width
- ;; information, since we were looking at local
- ;; variables in the wrong buffer.
- (if orig-buf (set-buffer orig-buf))
- (funcall enriched-initial-annotation))))
- (enriched-map-property-regions 'hard
- (lambda (v b e)
- (if (and v (= ?\n (char-after b)))
- (progn (goto-char b) (insert "\n"))))
- (point) nil)
- (if enriched-verbose (message nil))
- ;; Return new end.
- (point-max)))
-
- (defun enriched-make-annotation (name positive)
- "Format an annotation called NAME.
- If POSITIVE is non-nil, this is the opening annotation, if nil, this is the
- matching close."
- (cond ((stringp name)
- (format enriched-annotation-format (if positive "" "/") name))
- ;; Otherwise it is an annotation with parameters, represented as a list
- (positive
- (let ((item (car name))
- (params (cdr name)))
- (concat (format enriched-annotation-format "" item)
- (mapconcat (lambda (i) (concat "<param>" i "</param>"))
- params ""))))
- (t (format enriched-annotation-format "/" (car name)))))
-
- ;; XEmacs addition
- (defun enriched-face-strip-size (face)
- "Create a symbol from the name of FACE devoid of size information,
- i.e. remove all larger- and smaller- prefixes."
- (let* ((face-symbol (face-name face))
- (face-name (symbol-name face-symbol))
- (old-name face-name)
- new-name)
- (while
- (not (string-equal
- old-name
- (setq new-name (replace-in-string old-name "^larger-" ""))))
- (setq old-name new-name))
-
- (while
- (not (string-equal
- old-name
- (setq new-name (replace-in-string old-name "^smaller-" ""))))
- (setq old-name new-name))
-
- (if (string-equal new-name face-name)
- face-symbol
- (intern new-name))))
-
- (defun enriched-encode-other-face (old new)
- "Generate annotations for random face change.
- One annotation each for foreground color, background color, italic, etc."
- (cons (and old (enriched-face-ans old))
- (and new (enriched-face-ans new))))
-
- (defun enriched-face-ans (face)
- "Return annotations specifying FACE."
- ;; XEmacs change (entire body of this function)
- (let ((face-name (symbol-name face)))
- (cond ((string-match "^fg:" face-name)
- (list (list "x-color" (substring face-name 3))))
- ((string-match "^bg:" face-name)
- (list (list "x-bg-color" (substring face-name 3))))
- ((or (string-match "^larger-" face-name)
- (string-match "^smaller-" face-name))
- (cdr (format-annotate-single-property-change
- 'face nil (enriched-face-strip-size face)
- enriched-translations)))
- (t
- (let* ((fg (and (not (eq (face-foreground face)
- (face-foreground 'default)))
- (color-name (face-foreground face))))
- (bg (and (not (eq (face-background face)
- (face-background 'default)))
- (color-name (face-background face))))
- (ans '()))
- (if fg (setq ans (cons (list "x-color" fg) ans)))
- (if bg (setq ans (cons (list "x-bg-color" bg) ans)))
- ans)))))
-
- ;; XEmacs addition
- (defun enriched-size-annotation (n annotation)
- "Generate ANNOTATION N times."
- (let ((l '()))
- (while (not (zerop n))
- (setq l (cons annotation l))
- (setq n (1- n)))
- l))
-
- ;; XEmacs addition
- (defun enriched-encode-size (old new)
- "Return annotations specifying SIZE."
- (let* ((old (or old 0))
- (new (or new 0))
- (closing-annotation
- (enriched-size-annotation (abs old)
- (if (> old 0) "bigger" "smaller")))
- (opening-annotation
- (enriched-size-annotation (abs new)
- (if (> new 0) "bigger" "smaller"))))
- (cons closing-annotation
- opening-annotation)))
-
- ;;;
- ;;; Decoding files
- ;;;
-
- ;;;###autoload
- (defun enriched-decode (from to)
- (if enriched-verbose (message "Enriched: decoding document..."))
- (use-hard-newlines 1 'never)
- (save-excursion
- (save-restriction
- (narrow-to-region from to)
- (goto-char from)
-
- ;; Deal with header
- (let ((file-width (enriched-get-file-width)))
- (enriched-remove-header)
-
- ;; Deal with newlines
- (while (search-forward-regexp "\n\n+" nil t)
- (if (current-justification)
- (delete-char -1))
- (set-hard-newline-properties (match-beginning 0) (point)))
-
- ;; Translate annotations
- (format-deannotate-region from (point-max) enriched-translations
- 'enriched-next-annotation)
-
- ;; Indent or fill the buffer
- (cond (file-width ; File was filled to this width
- (setq fill-column file-width)
- (if enriched-verbose (message "Indenting..."))
- (enriched-insert-indentation))
- (t ; File was not filled.
- (if enriched-verbose (message "Filling paragraphs..."))
- (fill-region (point-min) (point-max))))
- (if enriched-verbose (message nil)))
- (point-max))))
-
- (defun enriched-next-annotation ()
- "Find and return next text/enriched annotation.
- Any \"<<\" strings encountered are converted to \"<\".
- Return value is \(begin end name positive-p), or nil if none was found."
- (while (and (search-forward "<" nil 1)
- (progn (goto-char (match-beginning 0))
- (not (looking-at enriched-annotation-regexp))))
- (forward-char 1)
- (if (= ?< (char-after (point)))
- (delete-char 1)
- ;; A single < that does not start an annotation is an error,
- ;; which we note and then ignore.
- (message "Warning: malformed annotation in file at %s"
- (1- (point)))))
- (if (not (eobp))
- (let* ((beg (match-beginning 0))
- (end (match-end 0))
- (name (downcase (buffer-substring
- (match-beginning 2) (match-end 2))))
- (pos (not (match-beginning 1))))
- (list beg end name pos))))
-
- (defun enriched-get-file-width ()
- "Look for file width information on this line."
- (save-excursion
- (if (search-forward "Text-Width: " (+ (point) 1000) t)
- (read (current-buffer)))))
-
- (defun enriched-remove-header ()
- "Remove file-format header at point."
- (while (looking-at "^[-A-Za-z]+: .*\n")
- (delete-region (point) (match-end 0)))
- (if (looking-at "^\n")
- (delete-char 1)))
-
- (defun enriched-decode-foreground (from to &optional color)
- ;; XEmacs change
- (let ((face (facemenu-get-face (intern (concat "fg:" color)))))
- (if (not face)
- (progn
- (make-face face)
- (message "Warning: Color \"%s\" can't be displayed." color)))
- (list from to 'face face)))
-
- (defun enriched-decode-background (from to &optional color)
- ;; XEmacs change
- (let ((face (facemenu-get-face (intern (concat "bg:" color)))))
- (if (not face)
- (progn
- (make-face face)
- (message "Warning: Color \"%s\" can't be displayed." color)))
- (list from to 'face face)))
-
- ;;; enriched.el ends here
-