;; Author: Milan Zamazal <pdm@zamazal.org>
;; Michal Nazarewicz <mina86@mina86.com>
-;; Version: 4.6
+;; Version: 4.6.1
;; Keywords: text, TeX, SGML, wp
;; This file is part of GNU Emacs.
:group 'tildify
:type '(repeat 'function))
+(defcustom tildify-double-space-undos t
+ "Weather `tildify-space' should undo hard space when space is typed again."
+ :version "25.1"
+ :group 'tildify
+ :type 'boolean)
;;;###autoload
(defun tildify-space ()
* `tildify-space-pattern' matches when `looking-back' (no more than 10
characters) from before the space character, and
* all predicates in `tildify-space-predicates' return non-nil,
-replace the space character with a hard space specified by
-`tildify-space-string' (note that the function does not take
-`tildify-string-alist' into consideration).
+replace the space character with value of `tildify-space-string' and
+return t.
-Return t if conversion happened, nil otherwise.
+Otherwise, if
+ * `tildify-double-space-undos' variable is non-nil,
+ * character before point is a space character, and
+ * text before that is a hard space as defined by
+ `tildify-space-string' variable,
+remove the hard space and leave only the space character.
This function is meant to be used as a `post-self-insert-hook'."
(interactive)
- (let ((p (point)) case-fold-search)
- (when (and (> (- p (point-min)) 2)
- (eq (preceding-char) ?\s)
- (eq (char-syntax (char-before (1- p))) ?w)
- (not (string-equal " " tildify-space-string))
- (save-excursion
- (goto-char (1- p))
- (looking-back tildify-space-pattern
- (max (point-min) (- p 10))))
- (run-hook-with-args-until-failure 'tildify-space-predicates))
- (delete-char -1)
- (insert tildify-space-string)
- t)))
+ (let* ((p (point)) (p-1 (1- p)) (n (- p (point-min)))
+ (l (length tildify-space-string)) (l+1 (1+ l))
+ case-fold-search)
+ (when (and (> n 2) (eq (preceding-char) ?\s))
+ (cond
+ ((and (eq (char-syntax (char-before p-1)) ?w)
+ (save-excursion
+ (goto-char p-1)
+ (looking-back tildify-space-pattern (max (point-min) (- p 10))))
+ (run-hook-with-args-until-failure 'tildify-space-predicates))
+ (delete-char -1)
+ (insert tildify-space-string)
+ t)
+ ((and tildify-double-space-undos
+ (> n l+1)
+ (string-equal tildify-space-string
+ (buffer-substring (- p l+1) p-1)))
+ (goto-char p-1)
+ (delete-char (- l))
+ (goto-char (1+ (point)))
+ nil)))))
(defun tildify-space-region-predicate ()
"Check whether character before point should be tildified.