+\f
+;;; Sort and index
+
+;; Sort an index which is in the current buffer between START and END.
+(defun texinfo-sort-region (start end)
+ (require 'sort)
+ (save-restriction
+ (narrow-to-region start end)
+ (goto-char (point-min))
+ (sort-subr nil 'forward-line 'end-of-line 'texinfo-sort-startkeyfun)))
+
+;; Subroutine for sorting an index.
+;; At start of a line, return a string to sort the line under.
+(defun texinfo-sort-startkeyfun ()
+ (let ((line (buffer-substring-no-properties (point) (line-end-position))))
+ ;; Canonicalize whitespace and eliminate funny chars.
+ (while (string-match "[ \t][ \t]+\\|[^a-z0-9 ]+" line)
+ (setq line (concat (substring line 0 (match-beginning 0))
+ " "
+ (substring line (match-end 0)))))
+ line))
+