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+;;; enriched.el --- read and save files in text/enriched format
+
+;; Copyright (c) 1994, 1995, 1996, 2002 Free Software Foundation, Inc.
+
+;; Author: Boris Goldowsky <boris@gnu.org>
+;; Keywords: wp, faces
+
+;; 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:
+
+;; 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.
+
+;;; 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 (:weight bold)))
+  "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 (:slant italic)))
+  "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 (or (copy-sequence standard-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")
+		   (enriched-decode-display-prop "x-display"))
+    (read-only     (t           "x-read-only"))
+    (display	   (nil		enriched-handle-display-prop))
+    (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
+
+
+(defcustom enriched-mode-hook nil
+  "Hook run after entering/leaving 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
+;;;
+
+(put 'enriched-mode 'permanent-local t)
+;;;###autoload
+(define-minor-mode enriched-mode
+  "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}"
+  nil " Enriched" nil
+  (cond ((null enriched-mode)
+	 ;; Turn mode off
+	 (setq buffer-file-format (delq 'text/enriched buffer-file-format))
+	 ;; restore old variable values
+	 (while enriched-old-bindings
+	   (set (pop enriched-old-bindings) (pop enriched-old-bindings))))
+
+	((memq 'text/enriched buffer-file-format)
+	 ;; Mode already on; do nothing.
+	 nil)
+
+	(t				; Turn mode on
+	 (push 'text/enriched buffer-file-format)
+	 ;; Save old variable values before we change them.
+	 ;; These will be restored if we exit Enriched mode.
+	 (setq enriched-old-bindings
+	       (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 ;WHY??  -sm
+	       buffer-display-table  enriched-display-table)
+	 (use-hard-newlines 1 nil)
+	 (let ((sticky (plist-get default-text-properties 'front-sticky))
+	       (p enriched-par-props))
+	   (dolist (x p)
+	     (add-to-list 'sticky x))
+	   (if sticky
+	       (setq default-text-properties
+		     (plist-put default-text-properties
+				'front-sticky sticky)))))))
+
+;;;
+;;; 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 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 (internal-ann positive)
+  "Format an annotation INTERNAL-ANN.
+INTERNAL-ANN may be a string, for a flag, or a list of the form (PARAM VALUE).
+If POSITIVE is non-nil, this is the opening annotation;
+if nil, the matching close."
+  (cond ((stringp internal-ann)
+	 (format enriched-annotation-format (if positive "" "/") internal-ann))
+	;; Otherwise it is an annotation with parameters, represented as a list
+	(positive
+	 (let ((item (car internal-ann))
+	       (params (cdr internal-ann)))
+	   (concat (format enriched-annotation-format "" item)
+		   (mapconcat (lambda (i) (concat "<param>" i "</param>"))
+			      params ""))))
+	(t (format enriched-annotation-format "/" (car internal-ann)))))
+
+(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.
+FACE may be a list of faces instead of a single face;
+it can also be anything allowed as an element of a list
+which can be the value of the `face' text property."
+  (cond ((and (consp face) (eq (car face) 'foreground-color))
+	 (list (list "x-color" (cdr face))))
+	((and (consp face) (eq (car face) 'background-color))
+	 (list (list "x-bg-color" (cdr face))))
+	((and (listp face) (eq (car face) :foreground))
+	 (list (list "x-color" (cadr face))))
+	((and (listp face) (eq (car face) :background))
+	 (list (list "x-bg-color" (cadr face))))
+	((listp face)
+	 (apply 'append (mapcar 'enriched-face-ans face)))
+	((let* ((fg (face-attribute face :foreground))
+		(bg (face-attribute face :background))
+		(props (face-font face t))
+		(ans (cdr (format-annotate-single-property-change
+			   'face nil props enriched-translations))))
+	   (unless (eq fg 'unspecified)
+	     (setq ans (cons (list "x-color" fg) ans)))
+	   (unless (eq bg 'unspecified)
+	     (setq ans (cons (list "x-bg-color" bg) ans)))
+	   ans))))
+
+;;;
+;;; 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)
+  (if color
+      (list from to 'face (list ':foreground color))
+    (message "Warning: no color specified for <x-color>")
+    nil))
+
+(defun enriched-decode-background (from to &optional color)
+  (if color
+      (list from to 'face (list ':background color))
+    (message "Warning: no color specified for <x-bg-color>")
+    nil))
+
+;;; Handling the `display' property.
+
+
+(defun enriched-handle-display-prop (old new)
+  "Return a list of annotations for a change in the `display' property.
+OLD is the old value of the property, NEW is the new value.  Value
+is a list `(CLOSE OPEN)', where CLOSE is a list of annotations to
+close and OPEN a list of annotations to open.  Each of these lists
+has the form `(ANNOTATION PARAM ...)'."
+  (let ((annotation "x-display")
+	(param (prin1-to-string (or old new))))
+    (if (null old)
+        (cons nil (list (list annotation param)))
+      (cons (list (list annotation param)) nil))))
+
+(defun enriched-decode-display-prop (start end &optional param)
+  "Decode a `display' property for text between START and END.
+PARAM is a `<param>' found for the property.
+Value is a list `(START END SYMBOL VALUE)' with START and END denoting
+the range of text to assign text property SYMBOL with value VALUE "
+  (let ((prop (when (stringp param)
+		(condition-case ()
+		    (car (read-from-string param))
+		  (error nil)))))
+    (unless prop
+      (message "Warning: invalid <x-display> parameter %s" param))
+    (list start end 'display prop)))
+
+;;; enriched.el ends here