;;; descr-text.el --- describe text mode
;; Copyright (C) 1994, 1995, 1996, 2001, 2002, 2003, 2004,
-;; 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
+;; 2005, 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
;; Author: Boris Goldowsky <boris@gnu.org>
;; Maintainer: FSF
;; This file is part of GNU Emacs.
-;; GNU Emacs is free software; you can redistribute it and/or modify
+;; 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 3, or (at your option)
-;; any later version.
+;; the Free Software Foundation, either version 3 of the License, 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
;; 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., 51 Franklin Street, Fifth Floor,
-;; Boston, MA 02110-1301, USA.
+;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;;; Code:
(eval-when-compile (require 'quail))
-(require 'help-fns)
+(require 'help-mode)
;;; Describe-Text Utilities.
(let ((pp (condition-case signal
(pp-to-string sexp)
(error (prin1-to-string signal)))))
- (when (string-match "\n\\'" pp)
+ (when (string-match-p "\n\\'" pp)
(setq pp (substring pp 0 (1- (length pp)))))
- (if (cond ((string-match "\n" pp)
- nil)
- ((> (length pp) (- (window-width) (current-column)))
- nil)
- (t t))
+
+ (if (and (not (string-match-p "\n" pp))
+ (<= (length pp) (- (window-width) (current-column))))
(insert pp)
(insert-text-button
"[Show]" 'action `(lambda (&rest ignore)
- (with-output-to-temp-buffer
- "*Pp Eval Output*"
- (princ ',pp)))
+ (with-output-to-temp-buffer
+ "*Pp Eval Output*"
+ (princ ',pp)))
'help-echo "mouse-2, RET: pretty print value in another buffer"))))
(defun describe-property-list (properties)
(symbol-name value)
'action `(lambda (&rest ignore)
(describe-text-category ',value))
+ 'follow-link t
'help-echo "mouse-2, RET: describe this category"))
((memq key '(face font-lock-face mouse-face))
(insert-text-button
(defun describe-text-category (category)
"Describe a text property category."
(interactive "SCategory: ")
- (help-setup-xref (list #'describe-text-category category) (interactive-p))
- (save-excursion
- (with-output-to-temp-buffer "*Help*"
- (set-buffer standard-output)
+ (help-setup-xref (list #'describe-text-category category)
+ (called-interactively-p 'interactive))
+ (with-help-window (help-buffer)
+ (with-current-buffer standard-output
(insert "Category " (format "%S" category) ":\n\n")
(describe-property-list (symbol-plist category))
(goto-char (point-min)))))
;;;###autoload
-(defun describe-text-properties (pos &optional output-buffer)
- "Describe widgets, buttons, overlays and text properties at POS.
+(defun describe-text-properties (pos &optional output-buffer buffer)
+ "Describe widgets, buttons, overlays, and text properties at POS.
+POS is taken to be in BUFFER or in current buffer if nil.
Interactively, describe them for the character after point.
If optional second argument OUTPUT-BUFFER is non-nil,
insert the output into that buffer, and don't initialize or clear it
otherwise."
(interactive "d")
+ (let ((src-buf (current-buffer)))
+ (if buffer (set-buffer buffer) (setq buffer (current-buffer)))
(if (>= pos (point-max))
(error "No character follows specified position"))
(if output-buffer
(describe-text-properties-1 pos output-buffer)
(if (not (or (text-properties-at pos) (overlays-at pos)))
(message "This is plain text.")
- (let ((buffer (current-buffer))
- (target-buffer "*Help*"))
- (when (eq buffer (get-buffer target-buffer))
- (setq target-buffer "*Help*<2>"))
- (save-excursion
- (with-output-to-temp-buffer target-buffer
- (set-buffer standard-output)
+ (with-temp-buffer
(setq output-buffer (current-buffer))
(insert "Text content at position " (format "%d" pos) ":\n\n")
- (with-current-buffer buffer
- (describe-text-properties-1 pos output-buffer))
- (goto-char (point-min))))))))
+ (set-buffer buffer)
+ (describe-text-properties-1 pos output-buffer)
+ (set-buffer src-buf)
+ (help-setup-xref (list 'describe-text-properties pos nil buffer)
+ (called-interactively-p 'interactive))
+ (with-help-window (help-buffer)
+ (with-current-buffer standard-output
+ (buffer-swap-text output-buffer)
+ (goto-char (point-min)))))))))
(defun describe-text-properties-1 (pos output-buffer)
(let* ((properties (text-properties-at pos))
(insert "There are text properties here:\n")
(describe-property-list properties)))))
\f
-(defcustom describe-char-unidata-list nil
+(defcustom describe-char-unidata-list
+ '(name old-name general-category decomposition)
"List of Unicode-based character property names shown by `describe-char'."
:group 'mule
:version "23.1"
:type '(choice (const :tag "All properties" t)
(set
- (const :tag "Unicode Name" name)
+ (const :tag "Unicode name" name)
+ (const :tag "Unicode old name" old-name)
(const :tag "Unicode general category " general-category)
(const :tag "Unicode canonical combining class"
canonical-combining-class)
(const :tag "Unicode digit value" digit-value)
(const :tag "Unicode numeric value" numeric-value)
(const :tag "Unicode mirrored" mirrored)
- (const :tag "Unicode old name" old-name)
(const :tag "Unicode ISO 10646 comment" iso-10646-comment)
(const :tag "Unicode simple uppercase mapping" uppercase)
(const :tag "Unicode simple lowercase mapping" lowercase)
:type '(choice (const :tag "None" nil)
file))
-;; We could convert the unidata file into a Lispy form once-for-all
-;; and distribute it for loading on demand. It might be made more
-;; space-efficient by splitting strings word-wise and replacing them
-;; with lists of symbols interned in a private obarray, e.g.
-;; "LATIN SMALL LETTER A" => '(LATIN SMALL LETTER A).
-
-;; Fixme: Check whether this needs updating for Unicode 4.
(defun describe-char-unicode-data (char)
"Return a list of Unicode data for unicode CHAR.
Each element is a list of a property description and the property value.
(lambda (arg)
(string (string-to-number arg 16)))
parts " "))
- (concat info parts))))
+ (concat info (if info " ") parts))))
(list "Decimal digit value"
(nth 5 fields))
(list "Digit value"
(string (string-to-number
(nth 13 fields) 16)))))))))))
+;; Not defined on builds without X, but behind display-graphic-p.
+(declare-function internal-char-font "fontset.c" (position &optional ch))
+
;; Return information about how CHAR is displayed at the buffer
;; position POS. If the selected frame is on a graphic display,
-;; return a cons (FONTNAME . GLYPH-CODE) where GLYPH-CODE is a
-;; hexadigit string representing the glyph-ID. Otherwise, return a
-;; string describing the terminal codes for the character.
+;; return a string "FONT-DRIVER:FONT-NAME (GLYPH-CODE)" where:
+;; FONT-DRIVER is the font-driver name,
+;; FONT-NAME is the font name,
+;; GLYPH-CODE is a hexadigit string representing the glyph-ID.
+;; Otherwise, return a string describing the terminal codes for the
+;; character.
(defun describe-char-display (pos char)
(if (display-graphic-p (selected-frame))
(let ((char-font-info (internal-char-font pos char)))
(if char-font-info
- (if (integerp (cdr char-font-info))
- (setcdr char-font-info (format "%02X" (cdr char-font-info)))
- (setcdr char-font-info
- (format "%04X%04X"
- (cadr char-font-info) (cddr char-font-info)))))
- char-font-info)
- (let* ((coding (terminal-coding-system))
- (encoded (encode-coding-char char coding)))
+ (let ((type (font-get (car char-font-info) :type))
+ (name (font-xlfd-name (car char-font-info)))
+ (code (cdr char-font-info)))
+ (if (integerp code)
+ (format "%s:%s (#x%02X)" type name code)
+ (format "%s:%s (#x%04X%04X)"
+ type name (car code) (cdr code))))))
+ (let* ((charset (get-text-property pos 'charset))
+ (coding (or (terminal-coding-system) 'us-ascii))
+ (encoded (encode-coding-char char coding charset)))
(if encoded
(encoded-string-description encoded coding)))))
\f
+;; Return a string of CH with composition for padding on both sides.
+;; It is displayed without overlapping with the left/right columns.
+(defsubst describe-char-padded-string (ch)
+ (if (internal-char-font nil ch)
+ (compose-string (string ch) 0 1 (format "\t%c\t" ch))
+ (string ch)))
+
+;; Return a nicely formated list of categories; extended category
+;; description is added to the category name as a tooltip
+(defsubst describe-char-categories (category-set)
+ (let ((mnemonics (category-set-mnemonics category-set)))
+ (unless (eq mnemonics "")
+ (list (mapconcat
+ #'(lambda (x)
+ (let* ((c (category-docstring x))
+ (doc (if (string-match "\\`\\(.*?\\)\n\\(.*\\)\\'" c)
+ (propertize (match-string 1 c)
+ 'help-echo (match-string 2 c))
+ c)))
+ (format "%c:%s" x doc)))
+ mnemonics ", ")))))
+
;;;###autoload
-(defun describe-char (pos)
+(defun describe-char (pos &optional buffer)
"Describe the character after POS (interactively, the character after point).
+Is POS is taken to be in buffer BUFFER or current buffer if nil.
The information includes character code, charset and code points in it,
syntax, category, how the character is encoded in a file,
character composition information (if relevant),
as well as widgets, buttons, overlays, and text properties."
(interactive "d")
- (if (>= pos (point-max))
- (error "No character follows specified position"))
- (let* ((char (char-after pos))
- (charset (char-charset char))
- (composition (find-composition pos nil nil t))
- (component-chars nil)
- (display-table (or (window-display-table)
- buffer-display-table
- standard-display-table))
- (disp-vector (and display-table (aref display-table char)))
- (multibyte-p enable-multibyte-characters)
- (overlays (mapcar #'(lambda (o) (overlay-properties o))
- (overlays-at pos)))
- (char-description (if (not multibyte-p)
- (single-key-description char)
- (if (< char 128)
- (single-key-description char)
- (string-to-multibyte
- (char-to-string char)))))
- (text-props-desc
- (let ((tmp-buf (generate-new-buffer " *text-props*")))
- (unwind-protect
- (progn
- (describe-text-properties pos tmp-buf)
- (with-current-buffer tmp-buf (buffer-string)))
- (kill-buffer tmp-buf))))
- item-list max-width code)
-
- (setq code (encode-char char charset))
- (setq item-list
- `(("character"
- ,(format "%s (%d, #o%o, #x%x)"
- (apply 'propertize char-description
- (text-properties-at pos))
- char char char))
- ("preferred charset"
- ,`(insert-text-button
- ,(symbol-name charset)
- 'type 'help-character-set 'help-args '(,charset))
- ,(format "(%s)" (charset-description charset)))
- ("code point"
- ,(let ((str (if (integerp code)
- (format (if (< code 256) "0x%02X" "0x%04X") code)
- (format "0x%04X%04X" (car code) (cdr code)))))
- (if (<= (charset-dimension charset) 2)
- `(insert-text-button
- ,str
- 'action (lambda (&rest ignore)
- (list-charset-chars ',charset)
- (with-selected-window
- (get-buffer-window "*Character List*" 0)
- (goto-char (point-min))
- (forward-line 2) ;Skip the header.
- (let ((case-fold-search nil))
- (if (search-forward ,(char-to-string char)
- nil t)
- (goto-char (match-beginning 0))))))
- 'help-echo
- "mouse-2, RET: show this character in its character set")
- str)))
- ("syntax"
- ,(let ((syntax (syntax-after pos)))
- (with-temp-buffer
- (internal-describe-syntax-value syntax)
- (buffer-string))))
- ("category"
- ,@(let ((category-set (char-category-set char)))
- (if (not category-set)
- '("-- none --")
- (mapcar #'(lambda (x) (format "%c:%s"
- x (category-docstring x)))
- (category-set-mnemonics category-set)))))
- ("to input"
- ,@(let ((key-list (and (eq input-method-function
- 'quail-input-method)
- (quail-find-key char))))
- (if (consp key-list)
- (list "type"
- (mapconcat #'(lambda (x) (concat "\"" x "\""))
- key-list " or ")
- "with"
- `(insert-text-button
- ,current-input-method
- 'type 'help-input-method
- 'help-args '(,current-input-method))))))
- ("buffer code"
- ,(encoded-string-description
- (string-as-unibyte (char-to-string char)) nil))
- ("file code"
- ,@(let* ((coding buffer-file-coding-system)
- (encoded (encode-coding-char char coding)))
- (if encoded
- (list (encoded-string-description encoded coding)
- (format "(encoded by coding system %S)" coding))
- (list "not encodable by coding system"
- (symbol-name coding)))))
- ("display"
- ,(cond
- (disp-vector
- (setq disp-vector (copy-sequence disp-vector))
- (dotimes (i (length disp-vector))
- (setq char (aref disp-vector i))
- (aset disp-vector i
- (cons char (describe-char-display
- pos (glyph-char char)))))
- (format "by display table entry [%s] (see below)"
- (mapconcat
- #'(lambda (x)
- (format "?%c" (glyph-char (car x))))
- disp-vector " ")))
- (composition
- (let ((from (car composition))
- (to (nth 1 composition))
- (next (1+ pos))
- (components (nth 2 composition))
- ch)
- (setcar composition
- (and (< from pos) (buffer-substring from pos)))
- (setcar (cdr composition)
- (and (< next to) (buffer-substring next to)))
- (dotimes (i (length components))
- (if (integerp (setq ch (aref components i)))
- (push (cons ch (describe-char-display pos ch))
- component-chars)))
- (setq component-chars (nreverse component-chars))
- (format "composed to form \"%s\" (see below)"
- (buffer-substring from to))))
- (t
- (let ((display (describe-char-display pos char)))
- (if (display-graphic-p (selected-frame))
- (if display
- (concat
- "by this font (glyph code)\n"
- (format " %s (#x%s)"
- (car display) (cdr display)))
- "no font available")
- (if display
- (format "terminal code %s" display)
- "not encodable for terminal"))))))
- ,@(let ((face
- (if (not (or disp-vector composition))
- (cond
- ((and show-trailing-whitespace
- (save-excursion (goto-char pos)
- (looking-at "[ \t]+$")))
- 'trailing-whitespace)
- ((and nobreak-char-display char (eq char '#xa0))
- 'nobreak-space)
- ((and nobreak-char-display char (eq char '#xad))
- 'escape-glyph)
- ((and (< char 32) (not (memq char '(9 10))))
- 'escape-glyph)))))
- (if face (list (list "hardcoded face"
- `(insert-text-button
- ,(symbol-name face)
- 'type 'help-face 'help-args '(,face))))))
- ,@(let ((unicodedata (describe-char-unicode-data char)))
- (if unicodedata
- (cons (list "Unicode data" " ") unicodedata)))))
- (setq max-width (apply #'max (mapcar #'(lambda (x)
- (if (cadr x) (length (car x)) 0))
- item-list)))
- (help-setup-xref nil (interactive-p))
- (with-help-window (help-buffer)
- (with-current-buffer standard-output
- (set-buffer-multibyte multibyte-p)
- (let ((formatter (format "%%%ds:" max-width)))
- (dolist (elt item-list)
- (when (cadr elt)
- (insert (format formatter (car elt)))
- (dolist (clm (cdr elt))
- (if (eq (car-safe clm) 'insert-text-button)
- (progn (insert " ") (eval clm))
- (when (>= (+ (current-column)
- (or (string-match "\n" clm)
- (string-width clm))
- 1)
- (window-width))
- (insert "\n")
- (indent-to (1+ max-width)))
- (insert " " clm)))
- (insert "\n"))))
-
- (when overlays
- (save-excursion
- (goto-char (point-min))
- (re-search-forward "character:[ \t\n]+")
- (let* ((end (+ (point) (length char-description))))
- (mapc #'(lambda (props)
- (let ((o (make-overlay (point) end)))
- (while props
- (overlay-put o (car props) (nth 1 props))
- (setq props (cddr props)))))
- overlays))))
-
- (when disp-vector
- (insert
- "\nThe display table entry is displayed by ")
- (if (display-graphic-p (selected-frame))
- (progn
- (insert "these fonts (glyph codes):\n")
- (dotimes (i (length disp-vector))
- (insert (glyph-char (car (aref disp-vector i))) ?:
- (propertize " " 'display '(space :align-to 5))
- (if (cdr (aref disp-vector i))
- (format "%s (#x%s)" (cadr (aref disp-vector i))
- (cddr (aref disp-vector i)))
- "-- no font --")
- "\n")
- (let ((face (glyph-face (car (aref disp-vector i)))))
- (when face
- (insert (propertize " " 'display '(space :align-to 5))
- "face: ")
- (insert (concat "`" (symbol-name face) "'"))
- (insert "\n")))))
- (insert "these terminal codes:\n")
- (dotimes (i (length disp-vector))
- (insert (car (aref disp-vector i))
- (propertize " " 'display '(space :align-to 5))
- (or (cdr (aref disp-vector i)) "-- not encodable --")
- "\n"))))
-
- (when composition
- (insert "\nComposed")
- (if (car composition)
- (if (cadr composition)
- (insert " with the surrounding characters \""
- (car composition) "\" and \""
- (cadr composition) "\"")
- (insert " with the preceding character(s) \""
- (car composition) "\""))
- (if (cadr composition)
- (insert " with the following character(s) \""
- (cadr composition) "\"")))
- (if (and (vectorp (nth 2 composition))
- (vectorp (aref (nth 2 composition) 0)))
- (progn
- (insert " using this font:\n "
- (aref (query-font (aref (aref (nth 2 composition) 0) 0))
- 0)
- "\nby these glyphs:\n")
- (mapc (lambda (x) (insert (format " %S\n" x)))
- (nth 2 composition)))
- (insert " by the rule:\n\t("
- (mapconcat (lambda (x)
- (if (consp x) (format "%S" x)
- (if (= x ?\t)
- (single-key-description x)
- (string ?? x))))
- (nth 2 composition)
- " ")
- ")")
- (insert "\nThe component character(s) are displayed by ")
- (if (display-graphic-p (selected-frame))
- (progn
- (insert "these fonts (glyph codes):")
- (dolist (elt component-chars)
- (if (/= (car elt) ?\t)
- (insert "\n " (car elt) ?:
- (propertize " " 'display '(space :align-to 5))
- (if (cdr elt)
- (format "%s (#x%s)" (cadr elt) (cddr elt))
- "-- no font --")))))
- (insert "these terminal codes:")
- (dolist (elt component-chars)
- (insert "\n " (car elt) ":"
- (propertize " " 'display '(space :align-to 4))
- (or (cdr elt) "-- not encodable --"))))
- (insert "\nSee the variable `reference-point-alist' for "
- "the meaning of the rule.\n")))
-
- (insert (if (not describe-char-unidata-list)
- "\nCharacter code properties are not shown: "
- "\nCharacter code properties: "))
- (insert-text-button
- "customize what to show"
- 'action (lambda (&rest ignore)
- (customize-variable
- 'describe-char-unidata-list)))
- (insert "\n")
- (dolist (elt (if (eq describe-char-unidata-list t)
- (nreverse (mapcar 'car char-code-property-alist))
- describe-char-unidata-list))
- (let ((val (get-char-code-property char elt))
- description)
- (when val
- (setq description (char-code-property-description elt val))
- (insert (if description
- (format " %s: %s (%s)\n" elt val description)
- (format " %s: %s\n" elt val))))))
-
- (if text-props-desc (insert text-props-desc))
- (setq help-xref-stack-item (list 'help-insert-string (buffer-string)))
- (toggle-read-only 1)))))
-
-(defalias 'describe-char-after 'describe-char)
-(make-obsolete 'describe-char-after 'describe-char "22.1")
+ (unless (buffer-live-p buffer) (setq buffer (current-buffer)))
+ (let ((src-buf (current-buffer)))
+ (set-buffer buffer)
+ (if (>= pos (point-max))
+ (error "No character follows specified position"))
+ (let* ((char (char-after pos))
+ (eight-bit-p (and (not enable-multibyte-characters) (>= char 128)))
+ (charset (if eight-bit-p 'eight-bit
+ (or (get-text-property pos 'charset)
+ (char-charset char))))
+ (composition (find-composition pos nil nil t))
+ (component-chars nil)
+ (display-table (or (window-display-table)
+ buffer-display-table
+ standard-display-table))
+ (disp-vector (and display-table (aref display-table char)))
+ (multibyte-p enable-multibyte-characters)
+ (overlays (mapcar #'(lambda (o) (overlay-properties o))
+ (overlays-at pos)))
+ (char-description (if (not multibyte-p)
+ (single-key-description char)
+ (if (< char 128)
+ (single-key-description char)
+ (string-to-multibyte
+ (char-to-string char)))))
+ (text-props-desc
+ (let ((tmp-buf (generate-new-buffer " *text-props*")))
+ (unwind-protect
+ (progn
+ (describe-text-properties pos tmp-buf)
+ (with-current-buffer tmp-buf (buffer-string)))
+ (kill-buffer tmp-buf))))
+ item-list max-width code)
+
+ (if multibyte-p
+ (or (setq code (encode-char char charset))
+ (setq charset (char-charset char)
+ code (encode-char char charset)))
+ (setq code char))
+ (when composition
+ ;; When the composition is trivial (i.e. composed only with the
+ ;; current character itself without any alternate characters),
+ ;; we don't show the composition information. Otherwise, store
+ ;; two descriptive strings in the first two elements of
+ ;; COMPOSITION.
+ (or (catch 'tag
+ (let ((from (car composition))
+ (to (nth 1 composition))
+ (components (nth 2 composition))
+ ch)
+ (if (and (vectorp components) (vectorp (aref components 0)))
+ (let ((idx (- pos from))
+ (nglyphs (lgstring-glyph-len components))
+ (i 0) j glyph glyph-from)
+ ;; COMPONENTS is a gstring. Find a grapheme
+ ;; cluster containing the current character.
+ (while (and (< i nglyphs)
+ (setq glyph (lgstring-glyph components i))
+ (< (lglyph-to glyph) idx))
+ (setq i (1+ i)))
+ (if (or (not glyph) (= i nglyphs))
+ ;; The composition is broken.
+ (throw 'tag nil))
+ (setq glyph-from (lglyph-from glyph)
+ to (+ from (lglyph-to glyph) 1)
+ from (+ from glyph-from)
+ j i)
+ (while (and (< j nglyphs)
+ (setq glyph (lgstring-glyph components j))
+ (= (lglyph-from glyph) glyph-from))
+ (setq j (1+ j)))
+ (if (and (= to (1+ from))
+ (= i (1- j))
+ (setq glyph (lgstring-glyph components i))
+ (= char (lglyph-char glyph)))
+ ;; The composition is trivial.
+ (throw 'tag nil))
+ (nconc composition (list i (1- j))))
+ (dotimes (i (length components))
+ (if (integerp (setq ch (aref components i)))
+ (push (cons ch (describe-char-display pos ch))
+ component-chars)))
+ (setq component-chars (nreverse component-chars)))
+ (if (< from pos)
+ (if (< (1+ pos) to)
+ (setcar composition
+ (concat
+ " with the surrounding characters \""
+ (mapconcat 'describe-char-padded-string
+ (buffer-substring from pos) "")
+ "\" and \""
+ (mapconcat 'describe-char-padded-string
+ (buffer-substring (1+ pos) to) "")
+ "\""))
+ (setcar composition
+ (concat
+ " with the preceding character(s) \""
+ (mapconcat 'describe-char-padded-string
+ (buffer-substring from pos) "")
+ "\"")))
+ (if (< (1+ pos) to)
+ (setcar composition
+ (concat
+ " with the following character(s) \""
+ (mapconcat 'describe-char-padded-string
+ (buffer-substring (1+ pos) to) "")
+ "\""))
+ (setcar composition nil)))
+ (setcar (cdr composition)
+ (format "composed to form \"%s\" (see below)"
+ (buffer-substring from to)))))
+ (setq composition nil)))
+
+ (setq item-list
+ `(("character"
+ ,(format "%s (%d, #o%o, #x%x)"
+ (apply 'propertize char-description
+ (text-properties-at pos))
+ char char char))
+ ("preferred charset"
+ ,`(insert-text-button
+ ,(symbol-name charset)
+ 'type 'help-character-set 'help-args '(,charset))
+ ,(format "(%s)" (charset-description charset)))
+ ("code point"
+ ,(let ((str (if (integerp code)
+ (format (if (< code 256) "0x%02X" "0x%04X")
+ code)
+ (format "0x%04X%04X" (car code) (cdr code)))))
+ (if (<= (charset-dimension charset) 2)
+ `(insert-text-button
+ ,str
+ 'action (lambda (&rest ignore)
+ (list-charset-chars ',charset)
+ (with-selected-window
+ (get-buffer-window "*Character List*" 0)
+ (goto-char (point-min))
+ (forward-line 2) ;Skip the header.
+ (let ((case-fold-search nil))
+ (if (search-forward
+ ,(char-to-string char) nil t)
+ (goto-char (match-beginning 0))))))
+ 'follow-link t
+ 'help-echo
+ "mouse-2, RET: show this character in its character set")
+ str)))
+ ("syntax"
+ ,(let ((syntax (syntax-after pos)))
+ (with-temp-buffer
+ (internal-describe-syntax-value syntax)
+ (buffer-string))))
+ ("category"
+ ,@(if (not eight-bit-p)
+ (let ((category-set (char-category-set char)))
+ (if category-set
+ (describe-char-categories category-set)
+ '("-- none --")))))
+ ("to input"
+ ,@(if (not eight-bit-p)
+ (let ((key-list (and (eq input-method-function
+ 'quail-input-method)
+ (quail-find-key char))))
+ (if (consp key-list)
+ (list "type"
+ (concat "\""
+ (mapconcat 'identity
+ key-list "\" or \"")
+ "\"")
+ "with"
+ `(insert-text-button
+ ,current-input-method
+ 'type 'help-input-method
+ 'help-args '(,current-input-method)))))))
+ ("buffer code"
+ ,(if multibyte-p
+ (encoded-string-description
+ (string-as-unibyte (char-to-string char)) nil)
+ (format "#x%02X" char)))
+ ("file code"
+ ,@(if multibyte-p
+ (let* ((coding buffer-file-coding-system)
+ (encoded (encode-coding-char char coding charset)))
+ (if encoded
+ (list (encoded-string-description encoded coding)
+ (format "(encoded by coding system %S)"
+ coding))
+ (list "not encodable by coding system"
+ (symbol-name coding))))
+ (list (format "#x%02X" char))))
+ ("display"
+ ,(cond
+ (disp-vector
+ (setq disp-vector (copy-sequence disp-vector))
+ (dotimes (i (length disp-vector))
+ (aset disp-vector i
+ (cons (aref disp-vector i)
+ (describe-char-display
+ pos (glyph-char (aref disp-vector i))))))
+ (format "by display table entry [%s] (see below)"
+ (mapconcat
+ #'(lambda (x)
+ (format "?%c" (glyph-char (car x))))
+ disp-vector " ")))
+ (composition
+ (cadr composition))
+ (t
+ (let ((display (describe-char-display pos char)))
+ (if (display-graphic-p (selected-frame))
+ (if display
+ (concat "by this font (glyph code)\n " display)
+ "no font available")
+ (if display
+ (format "terminal code %s" display)
+ "not encodable for terminal"))))))
+ ,@(let ((face
+ (if (not (or disp-vector composition))
+ (cond
+ ((and show-trailing-whitespace
+ (save-excursion (goto-char pos)
+ (looking-at-p "[ \t]+$")))
+ 'trailing-whitespace)
+ ((and nobreak-char-display char (eq char '#xa0))
+ 'nobreak-space)
+ ((and nobreak-char-display char (eq char '#xad))
+ 'escape-glyph)
+ ((and (< char 32) (not (memq char '(9 10))))
+ 'escape-glyph)))))
+ (if face (list (list "hardcoded face"
+ `(insert-text-button
+ ,(symbol-name face)
+ 'type 'help-face
+ 'help-args '(,face))))))
+ ,@(if (not eight-bit-p)
+ (let ((unicodedata (describe-char-unicode-data char)))
+ (if unicodedata
+ (cons (list "Unicode data" " ") unicodedata))))))
+ (setq max-width (apply 'max (mapcar (lambda (x)
+ (if (cadr x) (length (car x)) 0))
+ item-list)))
+ (set-buffer src-buf)
+ (help-setup-xref (list 'describe-char pos buffer)
+ (called-interactively-p 'interactive))
+ (with-help-window (help-buffer)
+ (with-current-buffer standard-output
+ (set-buffer-multibyte multibyte-p)
+ (let ((formatter (format "%%%ds:" max-width)))
+ (dolist (elt item-list)
+ (when (cadr elt)
+ (insert (format formatter (car elt)))
+ (dolist (clm (cdr elt))
+ (if (eq (car-safe clm) 'insert-text-button)
+ (progn (insert " ") (eval clm))
+ (when (>= (+ (current-column)
+ (or (string-match-p "\n" clm)
+ (string-width clm))
+ 1)
+ (window-width))
+ (insert "\n")
+ (indent-to (1+ max-width)))
+ (insert " " clm)))
+ (insert "\n"))))
+
+ (when overlays
+ (save-excursion
+ (goto-char (point-min))
+ (re-search-forward "character:[ \t\n]+")
+ (let ((end (+ (point) (length char-description))))
+ (mapc #'(lambda (props)
+ (let ((o (make-overlay (point) end)))
+ (while props
+ (overlay-put o (car props) (nth 1 props))
+ (setq props (cddr props)))))
+ overlays))))
+
+ (when disp-vector
+ (insert
+ "\nThe display table entry is displayed by ")
+ (if (display-graphic-p (selected-frame))
+ (progn
+ (insert "these fonts (glyph codes):\n")
+ (dotimes (i (length disp-vector))
+ (insert (glyph-char (car (aref disp-vector i))) ?:
+ (propertize " " 'display '(space :align-to 5))
+ (or (cdr (aref disp-vector i)) "-- no font --")
+ "\n")
+ (let ((face (glyph-face (car (aref disp-vector i)))))
+ (when face
+ (insert (propertize " " 'display '(space :align-to 5))
+ "face: ")
+ (insert (concat "`" (symbol-name face) "'"))
+ (insert "\n")))))
+ (insert "these terminal codes:\n")
+ (dotimes (i (length disp-vector))
+ (insert (car (aref disp-vector i))
+ (propertize " " 'display '(space :align-to 5))
+ (or (cdr (aref disp-vector i)) "-- not encodable --")
+ "\n"))))
+
+ (when composition
+ (insert "\nComposed")
+ (if (car composition)
+ (insert (car composition)))
+ (if (and (vectorp (nth 2 composition))
+ (vectorp (aref (nth 2 composition) 0)))
+ (let* ((gstring (nth 2 composition))
+ (font (lgstring-font gstring))
+ (from (nth 3 composition))
+ (to (nth 4 composition))
+ glyph)
+ (if (fontp font)
+ (progn
+ (insert " using this font:\n "
+ (symbol-name (font-get font :type))
+ ?:
+ (aref (query-font font) 0)
+ "\nby these glyphs:\n")
+ (while (and (<= from to)
+ (setq glyph (lgstring-glyph gstring from)))
+ (insert (format " %S\n" glyph))
+ (setq from (1+ from))))
+ (insert " by these characters:\n")
+ (while (and (<= from to)
+ (setq glyph (lgstring-glyph gstring from)))
+ (insert (format " %c (#x%d)\n"
+ (lglyph-char glyph) (lglyph-char glyph)))
+ (setq from (1+ from)))))
+ (insert " by the rule:\n\t(")
+ (let ((first t))
+ (mapc (lambda (x)
+ (if first (setq first nil)
+ (insert " "))
+ (if (consp x) (insert (format "%S" x))
+ (if (= x ?\t) (insert (single-key-description x))
+ (insert ??)
+ (insert (describe-char-padded-string x)))))
+ (nth 2 composition)))
+ (insert ")\nThe component character(s) are displayed by ")
+ (if (display-graphic-p (selected-frame))
+ (progn
+ (insert "these fonts (glyph codes):")
+ (dolist (elt component-chars)
+ (if (/= (car elt) ?\t)
+ (insert "\n "
+ (describe-char-padded-string (car elt))
+ ?:
+ (propertize " "
+ 'display '(space :align-to 5))
+ (or (cdr elt) "-- no font --")))))
+ (insert "these terminal codes:")
+ (dolist (elt component-chars)
+ (insert "\n " (car elt) ":"
+ (propertize " " 'display '(space :align-to 4))
+ (or (cdr elt) "-- not encodable --"))))
+ (insert "\nSee the variable `reference-point-alist' for "
+ "the meaning of the rule.\n")))
+
+ (unless eight-bit-p
+ (insert (if (not describe-char-unidata-list)
+ "\nCharacter code properties are not shown: "
+ "\nCharacter code properties: "))
+ (insert-text-button
+ "customize what to show"
+ 'action (lambda (&rest ignore)
+ (customize-variable
+ 'describe-char-unidata-list))
+ 'follow-link t)
+ (insert "\n")
+ (dolist (elt (if (eq describe-char-unidata-list t)
+ (nreverse (mapcar 'car char-code-property-alist))
+ describe-char-unidata-list))
+ (let ((val (get-char-code-property char elt))
+ description)
+ (when val
+ (setq description (char-code-property-description elt val))
+ (insert (if description
+ (format " %s: %s (%s)\n" elt val description)
+ (format " %s: %s\n" elt val)))))))
+
+ (if text-props-desc (insert text-props-desc))
+ (toggle-read-only 1))))))
+
+(define-obsolete-function-alias 'describe-char-after 'describe-char "22.1")
(provide 'descr-text)