-;;;###autoload
-(defun ps-mule-header-string-charsets ()
- "Return a list of character sets that appears in header strings."
- (let ((str ""))
- (when ps-print-header
- (let ((tail (list ps-left-header ps-right-header)))
- (while tail
- ;; Simulate what is done by ps-generate-header-line to get a
- ;; string to plot.
- (let ((count 0)
- (tmp (car tail)))
- (setq tail (cdr tail))
- (while (and tmp (< count ps-header-lines))
- (let ((elt (car tmp)))
- (setq tmp (cdr tmp)
- count (1+ count)
- str (concat str
- (cond ((stringp elt) elt)
- ((and (symbolp elt) (fboundp elt))
- (funcall elt))
- ((and (symbolp elt) (boundp elt))
- (symbol-value elt))
- (t ""))))))))))
- (let ((len (length str))
- (i 0)
- charset-list)
- (while (< i len)
- (let ((charset (char-charset (aref str i))))
- (setq i (1+ i))
- (or (eq charset 'ascii)
- (memq charset charset-list)
- (setq charset-list (cons charset charset-list)))))
- charset-list)))
+(defun ps-mule-show-warning (charsets from to header-footer-list)
+ (let ((table (make-category-table))
+ (buf (current-buffer))
+ (max-unprintable-chars 15)
+ char-pos-list)
+ (define-category ?u "Unprintable charset" table)
+ (dolist (cs charsets)
+ (modify-category-entry (make-char cs) ?u table))
+ (with-category-table table
+ (save-excursion
+ (goto-char from)
+ (while (and (<= (length char-pos-list) max-unprintable-chars)
+ (re-search-forward "\\cu" to t))
+ (push (cons (preceding-char) (1- (point))) char-pos-list))))
+ (with-output-to-temp-buffer "*Warning*"
+ (with-current-buffer standard-output
+ (when char-pos-list
+ (let ((func #'(lambda (buf pos)
+ (when (buffer-live-p buf)
+ (pop-to-buffer buf)
+ (goto-char pos))))
+ (more nil))
+ (if (>= (length char-pos-list) max-unprintable-chars)
+ (setq char-pos-list (cdr char-pos-list)
+ more t))
+ (insert "These characters in the buffer can't be printed:\n")
+ (dolist (elt (nreverse char-pos-list))
+ (insert " ")
+ (insert-text-button (string (car elt))
+ :type 'help-xref
+ 'help-echo
+ "mouse-2, RET: jump to this character"
+ 'help-function func
+ 'help-args (list buf (cdr elt)))
+ (insert ","))
+ (if more
+ (insert " and more...")
+ ;; Delete the last comma.
+ (delete-char -1))
+ (insert "\nClick them to jump to the buffer position,\n"
+ (substitute-command-keys "\
+or \\[universal-argument] \\[what-cursor-position] will give information about them.\n"))))
+
+ (with-category-table table
+ (let (string-list idx)
+ (dolist (elt header-footer-list)
+ (when (stringp elt)
+ (when (string-match "\\cu+" elt)
+ (setq elt (copy-sequence elt))
+ (put-text-property (match-beginning 0) (match-end 0)
+ 'face 'highlight elt)
+ (while (string-match "\\cu+" elt (match-end 0))
+ (put-text-property (match-beginning 0) (match-end 0)
+ 'face 'highlight elt))
+ (push elt string-list))))
+ (when string-list
+ (insert
+ "These highlighted characters in header/footer can't be printed:\n")
+ (dolist (elt string-list)
+ (insert " " elt "\n")))))))))