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+;;; evil-search.el --- Search and substitute
+
+;; Author: Vegard Øye <vegard_oye at hotmail.com>
+;; Maintainer: Vegard Øye <vegard_oye at hotmail.com>
+
+;; Version: 1.2.13
+
+;;
+;; This file is NOT part of GNU Emacs.
+
+;;; License:
+
+;; This file is part of Evil.
+;;
+;; Evil 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 of the License, or
+;; (at your option) any later version.
+;;
+;; Evil 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 Evil.  If not, see <http://www.gnu.org/licenses/>.
+
+(require 'evil-core)
+(require 'evil-common)
+(require 'evil-ex)
+
+;;; Code:
+
+(defun evil-select-search-module (option module)
+  "Change the search module according to MODULE.
+If MODULE is `isearch', then Emacs' isearch module is used.
+If MODULE is `evil-search', then Evil's own interactive
+search module is used."
+  (let ((search-functions
+         '(forward
+           backward
+           word-forward
+           word-backward
+           unbounded-word-forward
+           unbounded-word-backward
+           next
+           previous)))
+    (dolist (fun search-functions)
+      (let ((isearch (intern (format "evil-search-%s" fun)))
+            (evil-search (intern (format "evil-ex-search-%s" fun))))
+        (if (eq module 'isearch)
+            (substitute-key-definition
+             evil-search isearch evil-motion-state-map)
+          (substitute-key-definition
+           isearch evil-search evil-motion-state-map)))))
+  (set-default option module))
+
+;; this customization is here because it requires
+;; the knowledge of `evil-select-search-mode'
+(defcustom evil-search-module 'isearch
+  "The search module to be used."
+  :type '(radio (const :tag "Emacs built-in isearch." :value isearch)
+                (const :tag "Evil interactive search." :value evil-search))
+  :group 'evil
+  :set 'evil-select-search-module
+  :initialize 'evil-custom-initialize-pending-reset)
+
+(defun evil-push-search-history (string forward)
+  "Push STRING into the appropriate search history (determined by FORWARD)."
+  (let* ((history-var (if forward
+                          'evil-search-forward-history
+                        'evil-search-backward-history))
+         (history (symbol-value history-var)))
+    (unless (equal (car-safe history) string)
+      (set history-var (cons string history)))))
+
+(defun evil-search-incrementally (forward regexp-p)
+  "Search incrementally for user-entered text."
+  (let ((evil-search-prompt (evil-search-prompt forward))
+        (isearch-search-fun-function 'evil-isearch-function)
+        (point (point))
+        search-nonincremental-instead)
+    (setq isearch-forward forward)
+    (evil-save-echo-area
+      (evil-without-input-method-hooks
+       ;; set the input method locally rather than globally to ensure that
+       ;; isearch clears the input method when it's finished
+       (setq current-input-method evil-input-method)
+       (if forward
+           (isearch-forward regexp-p)
+         (isearch-backward regexp-p))
+       (evil-push-search-history isearch-string forward)
+       (setq current-input-method nil))
+      (when (/= (point) point)
+        ;; position the point at beginning of the match only if the call to
+        ;; `isearch' has really moved the point. `isearch' doesn't move the
+        ;; point only if "C-g" is hit twice to exit the search, in which case we
+        ;; shouldn't move the point either.
+        (when (and forward isearch-other-end)
+          (goto-char isearch-other-end))
+        (when (and (eq point (point))
+                   (not (string= isearch-string "")))
+          (if forward
+              (isearch-repeat-forward)
+            (isearch-repeat-backward))
+          (isearch-exit)
+          (when (and forward isearch-other-end)
+            (goto-char isearch-other-end)))
+        (evil-flash-search-pattern
+         (evil-search-message isearch-string forward))))))
+
+(defun evil-flash-search-pattern (string &optional all)
+  "Flash last search matches for duration of `evil-flash-delay'.
+If ALL is non-nil, flash all matches. STRING is a message
+to display in the echo area."
+  (let ((lazy-highlight-initial-delay 0)
+        (isearch-search-fun-function 'evil-isearch-function)
+        (isearch-case-fold-search case-fold-search)
+        (disable #'(lambda (&optional arg) (evil-flash-hook t))))
+    (when evil-flash-timer
+      (cancel-timer evil-flash-timer))
+    (unless (or (null string)
+                (string= string ""))
+      (evil-echo-area-save)
+      (evil-echo "%s" string)
+      (isearch-highlight (match-beginning 0) (match-end 0))
+      (when all
+        (setq isearch-lazy-highlight-wrapped nil
+              isearch-lazy-highlight-start (point)
+              isearch-lazy-highlight-end (point))
+        (isearch-lazy-highlight-new-loop)
+        (unless isearch-lazy-highlight-overlays
+          (isearch-lazy-highlight-update)))
+      (add-hook 'pre-command-hook #'evil-flash-hook nil t)
+      (add-hook 'evil-operator-state-exit-hook #'evil-flash-hook nil t)
+      (add-hook 'pre-command-hook #'evil-clean-isearch-overlays nil t)
+      (setq evil-flash-timer
+            (run-at-time evil-flash-delay nil disable)))))
+
+(defun evil-clean-isearch-overlays ()
+  "Clean isearch overlays unless `this-command' is search."
+  (remove-hook 'pre-command-hook #'evil-clean-isearch-overlays t)
+  (unless (memq this-command
+                '(evil-search-backward
+                  evil-search-forward
+                  evil-search-next
+                  evil-search-previous
+                  evil-search-word-backward
+                  evil-search-word-forward))
+    (isearch-clean-overlays)))
+(put 'evil-clean-isearch-overlays 'permanent-local-hook t)
+
+(defun evil-flash-hook (&optional force)
+  "Disable hightlighting if `this-command' is not search.
+Disable anyway if FORCE is t."
+  (when (or force
+            ;; to avoid flicker, don't disable highlighting
+            ;; if the next command is also a search command
+            (not (memq this-command
+                       '(evil-search-backward
+                         evil-search-forward
+                         evil-search-next
+                         evil-search-previous
+                         evil-search-word-backward
+                         evil-search-word-forward))))
+    (evil-echo-area-restore)
+    (isearch-dehighlight)
+    (setq isearch-lazy-highlight-last-string nil)
+    (lazy-highlight-cleanup t)
+    (when evil-flash-timer
+      (cancel-timer evil-flash-timer)))
+  (remove-hook 'pre-command-hook #'evil-flash-hook t)
+  (remove-hook 'evil-operator-state-exit-hook #'evil-flash-hook t))
+(put 'evil-flash-hook 'permanent-local-hook t)
+
+(defun evil-search-function (&optional forward regexp-p wrap)
+  "Return a search function.
+If FORWARD is nil, search backward, otherwise forward.
+If REGEXP-P is non-nil, the input is a regular expression.
+If WRAP is non-nil, the search wraps around the top or bottom
+of the buffer."
+  `(lambda (string &optional bound noerror count)
+     (let ((start (point))
+           (search-fun ',(if regexp-p
+                             (if forward
+                                 're-search-forward
+                               're-search-backward)
+                           (if forward
+                               'search-forward
+                             'search-backward)))
+           result)
+       (setq result (funcall search-fun string bound
+                             ,(if wrap t 'noerror) count))
+       (when (and ,wrap (null result))
+         (goto-char ,(if forward '(point-min) '(point-max)))
+         (unwind-protect
+             (setq result (funcall search-fun string bound noerror count))
+           (unless result
+             (goto-char start))))
+       result)))
+
+(defun evil-isearch-function ()
+  "Return a search function for use with isearch.
+Based on `isearch-regexp' and `isearch-forward'."
+  (evil-search-function isearch-forward evil-regexp-search evil-search-wrap))
+
+(defun evil-search (string forward &optional regexp-p start)
+  "Search for STRING and highlight matches.
+If FORWARD is nil, search backward, otherwise forward.
+If REGEXP-P is non-nil, STRING is taken to be a regular expression.
+START is the position to search from; if unspecified, it is
+one more than the current position."
+  (when (and (stringp string)
+             (not (string= string "")))
+    (let* ((orig (point))
+           (start (or start
+                      (if forward
+                          (min (point-max) (1+ orig))
+                        orig)))
+           (isearch-regexp regexp-p)
+           (isearch-forward forward)
+           (case-fold-search
+            (unless (and search-upper-case
+                         (not (isearch-no-upper-case-p string nil)))
+              case-fold-search))
+           (search-func (evil-search-function
+                         forward regexp-p evil-search-wrap)))
+      ;; no text properties, thank you very much
+      (set-text-properties 0 (length string) nil string)
+      ;; position to search from
+      (goto-char start)
+      (setq isearch-string string)
+      (isearch-update-ring string regexp-p)
+      (condition-case nil
+          (funcall search-func string)
+        (search-failed
+         (goto-char orig)
+         (user-error "\"%s\": %s not found"
+                     string (if regexp-p "pattern" "string"))))
+      ;; handle opening and closing of invisible area
+      (cond
+       ((boundp 'isearch-filter-predicates)
+        (dolist (pred isearch-filter-predicates)
+          (funcall pred (match-beginning 0) (match-end 0))))
+       ((boundp 'isearch-filter-predicate)
+        (funcall isearch-filter-predicate (match-beginning 0) (match-end 0))))
+      ;; always position point at the beginning of the match
+      (goto-char (match-beginning 0))
+      ;; determine message for echo area
+      (cond
+       ((and forward (< (point) start))
+        (setq string "Search wrapped around BOTTOM of buffer"))
+       ((and (not forward) (> (point) start))
+        (setq string "Search wrapped around TOP of buffer"))
+       (t
+        (setq string (evil-search-message string forward))))
+      (evil-flash-search-pattern string t))))
+
+(defun evil-search-word (forward unbounded symbol)
+  "Search for word near point.
+If FORWARD is nil, search backward, otherwise forward. If SYMBOL
+is non-nil then the functions searches for the symbol at point,
+otherwise for the word at point."
+  (let ((string (car-safe regexp-search-ring))
+        (move (if forward #'forward-char #'backward-char))
+        (end (if forward #'eobp #'bobp)))
+    (setq isearch-forward forward)
+    (cond
+     ((and (memq last-command
+                 '(evil-search-word-forward
+                   evil-search-word-backward))
+           (stringp string)
+           (not (string= string "")))
+      (evil-search string forward t))
+     (t
+      (setq string (evil-find-thing forward (if symbol 'symbol 'evil-word)))
+      (cond
+       ((null string)
+        (user-error "No word under point"))
+       (unbounded
+        (setq string (regexp-quote string)))
+       (t
+        (setq string
+              (format (if symbol "\\_<%s\\_>" "\\<%s\\>")
+                      (regexp-quote string)))))
+      (evil-push-search-history string forward)
+      (evil-search string forward t)))))
+
+(defun evil-find-thing (forward thing)
+  "Return THING near point as a string.
+THING should be a symbol understood by `thing-at-point',
+e.g. 'symbol or 'word.  If FORWARD is nil, search backward,
+otherwise forward.  Returns nil if nothing is found."
+  (let ((move (if forward #'forward-char #'backward-char))
+        (end (if forward #'eobp #'bobp))
+        string)
+    (save-excursion
+      (setq string (thing-at-point thing))
+      ;; if there's nothing under point, go forwards
+      ;; (or backwards) to find it
+      (while (and (null string) (not (funcall end)))
+        (funcall move)
+        (setq string (thing-at-point thing)))
+      (when (stringp string)
+        (set-text-properties 0 (length string) nil string))
+      (when (> (length string) 0)
+        string))))
+
+(defun evil-find-word (forward)
+  "Return word near point as a string.
+If FORWARD is nil, search backward, otherwise forward.  Returns
+nil if nothing is found."
+  (evil-find-thing forward 'word))
+
+(defun evil-find-symbol (forward)
+  "Return word near point as a string.
+If FORWARD is nil, search backward, otherwise forward.  Returns
+nil if nothing is found."
+  (evil-find-thing forward 'symbol))
+
+(defun evil-search-prompt (forward)
+  "Return the search prompt for the given direction."
+  (if forward "/" "?"))
+
+(defun evil-search-message (string forward)
+  "Prefix STRING with the search prompt."
+  (format "%s%s" (evil-search-prompt forward) string))
+
+(defadvice isearch-message-prefix (around evil activate)
+  "Use `evil-search-prompt'."
+  (if evil-search-prompt
+      (setq ad-return-value evil-search-prompt)
+    ad-do-it))
+
+(defadvice isearch-delete-char (around evil activate)
+  "Exit search if no search string."
+  (cond
+   ((and evil-search-prompt (string= isearch-string ""))
+    (let (search-nonincremental-instead)
+      (setq isearch-success nil)
+      (isearch-exit)))
+   (t
+    ad-do-it)))
+
+(defadvice isearch-lazy-highlight-search (around evil activate)
+  "Never wrap the search in this context."
+  (let (evil-search-wrap)
+    ad-do-it))
+
+;;; Ex search
+
+(defun evil-ex-regex-without-case (re)
+  "Return the regular expression without all occurrences of \\c and \\C."
+  (evil-transform-regexp re '((?c . "") (?C . ""))))
+
+(defun evil-ex-regex-case (re default-case)
+  "Return the case as implied by \\c or \\C in regular expression RE.
+If \\c appears anywhere in the pattern, the pattern is case
+insensitive. If \\C appears, the pattern is case sensitive.
+Only the first occurrence of \\c or \\C is used, all others are
+ignored. If neither \\c nor \\C appears in the pattern, the case
+specified by DEFAULT-CASE is used. DEFAULT-CASE should be either
+`sensitive', `insensitive' or `smart'. In the latter case, the pattern
+will be case-sensitive if and only if it contains an upper-case
+letter, otherwise it will be case-insensitive."
+  (cond
+   ((string-match "\\(?:^\\|[^\\\\]\\)\\(?:\\\\\\\\\\)*\\\\\\([cC]\\)" re)
+    (if (eq (aref (match-string 1 re) 0) ?c) 'insensitive 'sensitive))
+   ((eq default-case 'smart)
+    (if (isearch-no-upper-case-p re t)
+        'insensitive
+      'sensitive))
+   (t default-case)))
+
+;; a pattern
+(defun evil-ex-make-substitute-pattern (regexp flags)
+  "Creates a PATTERN for substitution with FLAGS.
+This function respects the values of `evil-ex-substitute-case'
+and `evil-ex-substitute-global'."
+  (evil-ex-make-pattern regexp
+                        (cond
+                         ((memq ?i flags) 'insensitive)
+                         ((memq ?I flags) 'sensitive)
+                         ((not evil-ex-substitute-case)
+                          evil-ex-search-case)
+                         (t evil-ex-substitute-case))
+                        (or (and evil-ex-substitute-global
+                                 (not (memq ?g flags)))
+                            (and (not evil-ex-substitute-global)
+                                 (memq ?g flags)))))
+
+(defun evil-ex-make-search-pattern (regexp)
+  "Creates a PATTERN for search.
+This function respects the values of `evil-ex-search-case'."
+  (evil-ex-make-pattern regexp evil-ex-search-case t))
+
+(defun evil-ex-make-pattern (regexp case whole-line)
+  "Create a new search pattern.
+REGEXP is the regular expression to be searched for. CASE should
+be either 'sensitive, 'insensitive for case-sensitive and
+case-insensitive search, respectively, or anything else.  In the
+latter case the pattern is smart-case, i.e. it is automatically
+sensitive of the pattern contains one upper case letter,
+otherwise it is insensitive.  The input REGEXP is considered a
+Vim-style regular expression if `evil-ex-search-vim-style-regexp'
+is non-nil, in which case it is transformed to an Emacs style
+regular expression (i.e. certain backslash-codes are
+transformed. Otherwise REGEXP must be an Emacs style regular
+expression and is not transformed."
+  (let ((re (evil-ex-regex-without-case regexp))
+        (ignore-case (eq (evil-ex-regex-case regexp case) 'insensitive)))
+    ;; possibly transform regular expression from vim-style to
+    ;; Emacs-style.
+    (if evil-ex-search-vim-style-regexp
+        (setq re (evil-transform-vim-style-regexp re))
+      ;; Even for Emacs regular expressions we translate certain
+      ;; whitespace sequences
+      (setq re (evil-transform-regexp re
+                                      '((?t . "\t")
+                                        (?n . "\n")
+                                        (?r . "\r")))))
+    (list re ignore-case whole-line)))
+
+(defun evil-ex-pattern-regex (pattern)
+  "Return the regular expression of a search PATTERN."
+  (nth 0 pattern))
+
+(defun evil-ex-pattern-ignore-case (pattern)
+  "Return t if and only if PATTERN should ignore case."
+  (nth 1 pattern))
+
+(defun evil-ex-pattern-whole-line (pattern)
+  "Return t if and only if PATTERN should match all occurences of a line.
+Otherwise PATTERN matches only the first occurence."
+  (nth 2 pattern))
+
+;; Highlight
+(defun evil-ex-make-hl (name &rest args)
+  "Create a new highlight object with name NAME and properties ARGS.
+The following properties are supported:
+:face The face to be used for the highlighting overlays.
+:win The window in which the highlighting should be shown.
+     Note that the highlight will be visible in all windows showing
+     the corresponding buffer, but only the matches visible in the
+     specified window will actually be highlighted. If :win is nil,
+     the matches in all windows will be highlighted.
+:min The minimal buffer position for highlighted matches.
+:max The maximal buffer position for highlighted matches.
+:match-hook A hook to be called once for each highlight.
+            The hook must take two arguments, the highlight and
+            the overlay for that highlight.
+:update-hook A hook called once after updating the highlighting
+             with two arguments, the highlight and a message string
+             describing the current match status."
+  (unless (symbolp name)
+    (user-error "Expected symbol as name of highlight"))
+  (let ((face 'evil-ex-lazy-highlight)
+        (win (selected-window))
+        min max match-hook update-hook)
+    (while args
+      (let ((key (pop args))
+            (val (pop args)))
+        (cond
+         ((eq key :face) (setq face val))
+         ((eq key :win)  (setq win val))
+         ((eq key :min)  (setq min val))
+         ((eq key :max)  (setq max val))
+         ((eq key :match-hook) (setq match-hook val))
+         ((eq key :update-hook) (setq update-hook val))
+         (t (user-error "Unexpected keyword: %s" key)))))
+    (when (assoc name evil-ex-active-highlights-alist)
+      (evil-ex-delete-hl name))
+    (when (null evil-ex-active-highlights-alist)
+      (add-hook 'window-scroll-functions
+                #'evil-ex-hl-update-highlights-scroll nil t)
+      (add-hook 'window-size-change-functions
+                #'evil-ex-hl-update-highlights-resize nil))
+    (push (cons name (vector name
+                             nil
+                             face
+                             win
+                             min
+                             max
+                             match-hook
+                             update-hook
+                             nil))
+          evil-ex-active-highlights-alist)))
+
+(defun evil-ex-hl-name (hl)
+  "Return the name of the highlight HL."
+  (aref hl 0))
+
+(defun evil-ex-hl-pattern (hl)
+  "Return the pattern of the highlight HL."
+  (aref hl 1))
+
+(defun evil-ex-hl-set-pattern (hl pattern)
+  "Set the pattern of the highlight HL to PATTERN."
+  (aset hl 1 pattern))
+
+(defun evil-ex-hl-face (hl)
+  "Return the face of the highlight HL."
+  (aref hl 2))
+
+(defun evil-ex-hl-window (hl)
+  "Return the window of the highlight HL."
+  (aref hl 3))
+
+(defun evil-ex-hl-min (hl)
+  "Return the minimal buffer position of the highlight HL."
+  (aref hl 4))
+
+(defun evil-ex-hl-set-min (hl min)
+  "Set the minimal buffer position of the highlight HL to MIN."
+  (aset hl 4 min))
+
+(defun evil-ex-hl-max (hl)
+  "Return the maximal buffer position of the highlight HL."
+  (aref hl 5))
+
+(defun evil-ex-hl-set-max (hl max)
+  "Set the minimal buffer position of the highlight HL to MAX."
+  (aset hl 5 max))
+
+(defun evil-ex-hl-match-hook (hl)
+  "Return the match-hook of the highlight HL."
+  (aref hl 6))
+
+(defun evil-ex-hl-update-hook (hl)
+  "Return the update-hook of the highlight HL."
+  (aref hl 7))
+
+(defun evil-ex-hl-overlays (hl)
+  "Return the list of active overlays of the highlight HL."
+  (aref hl 8))
+
+(defun evil-ex-hl-set-overlays (hl overlays)
+  "Set the list of active overlays of the highlight HL to OVERLAYS."
+  (aset hl 8 overlays))
+
+(defun evil-ex-delete-hl (name)
+  "Remove the highlighting object with a certain NAME."
+  (let ((hl (cdr-safe (assoc name evil-ex-active-highlights-alist))))
+    (when hl
+      (mapc #'delete-overlay (evil-ex-hl-overlays hl))
+      (setq evil-ex-active-highlights-alist
+            (assq-delete-all name evil-ex-active-highlights-alist))
+      (evil-ex-hl-update-highlights))
+    (when (null evil-ex-active-highlights-alist)
+      (remove-hook 'window-scroll-functions
+                   #'evil-ex-hl-update-highlights-scroll t)
+      (remove-hook 'window-size-change-functions
+                   #'evil-ex-hl-update-highlights-resize))))
+
+(defun evil-ex-hl-active-p (name)
+  "Whether the highlight with a certain NAME is active."
+  (and (assoc name evil-ex-active-highlights-alist) t))
+
+(defun evil-ex-hl-change (name pattern)
+  "Set the regular expression of highlight NAME to PATTERN."
+  (let ((hl (cdr-safe (assoc name evil-ex-active-highlights-alist))))
+    (when hl
+      (evil-ex-hl-set-pattern hl
+                              (if (zerop (length pattern))
+                                  nil
+                                pattern))
+      (evil-ex-hl-idle-update))))
+
+(defun evil-ex-hl-set-region (name beg end &optional type)
+  "Set minimal and maximal position of highlight NAME to BEG and END."
+  (let ((hl (cdr-safe (assoc name evil-ex-active-highlights-alist))))
+    (when hl
+      (evil-ex-hl-set-min hl beg)
+      (evil-ex-hl-set-max hl end)
+      (evil-ex-hl-idle-update))))
+
+(defun evil-ex-hl-get-max (name)
+  "Return the maximal position of the highlight with name NAME."
+  (let ((hl (cdr-safe (assoc name evil-ex-active-highlights-alist))))
+    (and hl (evil-ex-hl-max hl))))
+
+(defun evil-ex-hl-update-highlights ()
+  "Update the overlays of all active highlights."
+  (dolist (hl (mapcar #'cdr evil-ex-active-highlights-alist))
+    (let* ((old-ovs (evil-ex-hl-overlays hl))
+           new-ovs
+           (pattern (evil-ex-hl-pattern hl))
+           (case-fold-search (evil-ex-pattern-ignore-case pattern))
+           (case-replace case-fold-search)
+           (face (evil-ex-hl-face hl))
+           (match-hook (evil-ex-hl-match-hook hl))
+           result)
+      (if pattern
+          ;; collect all visible ranges
+          (let (ranges sranges)
+            (dolist (win (if (eq evil-ex-interactive-search-highlight
+                                 'all-windows)
+                             (get-buffer-window-list (current-buffer) nil t)
+                           (list (evil-ex-hl-window hl))))
+              (let ((beg (max (window-start win)
+                              (or (evil-ex-hl-min hl) (point-min))))
+                    (end (min (window-end win)
+                              (or (evil-ex-hl-max hl) (point-max)))))
+                (when (< beg end)
+                  (push (cons beg end) ranges))))
+            (setq ranges
+                  (sort ranges #'(lambda (r1 r2) (< (car r1) (car r2)))))
+            (while ranges
+              (let ((r1 (pop ranges))
+                    (r2 (pop ranges)))
+                (cond
+                 ;; last range
+                 ((null r2)
+                  (push r1 sranges))
+                 ;; ranges overlap, union
+                 ((>= (cdr r1) (car r2))
+                  (push (cons (car r1)
+                              (max (cdr r1) (cdr r2)))
+                        ranges))
+                 ;; ranges distinct
+                 (t
+                  (push r1 sranges)
+                  (push r2 ranges)))))
+
+            ;; run through all ranges
+            (condition-case lossage
+                (save-match-data
+                  (dolist (r sranges)
+                    (let ((beg (car r))
+                          (end (cdr r)))
+                      (save-excursion
+                        (goto-char beg)
+                        ;; set the overlays for the current highlight,
+                        ;; reusing old overlays (if possible)
+                        (while (and (not (eobp))
+                                    (evil-ex-search-find-next-pattern pattern)
+                                    (<= (match-end 0) end)
+                                    (not (and (= (match-end 0) end)
+                                              (string= (evil-ex-pattern-regex pattern)
+                                                       "^"))))
+                          (let ((ov (or (pop old-ovs) (make-overlay 0 0))))
+                            (move-overlay ov (match-beginning 0) (match-end 0))
+                            (overlay-put ov 'face face)
+                            (overlay-put ov 'evil-ex-hl (evil-ex-hl-name hl))
+                            (overlay-put ov 'priority 1000)
+                            (push ov new-ovs)
+                            (when match-hook (funcall match-hook hl ov)))
+                          (cond
+                           ((and (not (evil-ex-pattern-whole-line pattern))
+                                 (not (string-match-p "\n" (buffer-substring-no-properties
+                                                            (match-beginning 0)
+                                                            (match-end 0)))))
+                            (forward-line))
+                           ((= (match-beginning 0) (match-end 0))
+                            (forward-char))
+                           (t (goto-char (match-end 0))))))))
+                  (mapc #'delete-overlay old-ovs)
+                  (evil-ex-hl-set-overlays hl new-ovs)
+                  (if (or (null pattern) new-ovs)
+                      (setq result t)
+                    ;; Maybe the match could just not be found somewhere else?
+                    (save-excursion
+                      (goto-char (or (evil-ex-hl-min hl) (point-min)))
+                      (if (and (evil-ex-search-find-next-pattern pattern)
+                               (< (match-end 0) (or (evil-ex-hl-max hl)
+                                                    (point-max))))
+                          (setq result (format "Match in line %d"
+                                               (line-number-at-pos
+                                                (match-beginning 0))))
+                        (setq result "No match")))))
+
+              (invalid-regexp
+               (setq result (cadr lossage)))
+
+              (search-failed
+               (setq result (nth 2 lossage)))
+
+              (error
+               (setq result (format "%s" (cadr lossage))))
+
+              (user-error
+               (setq result (format "%s" (cadr lossage))))))
+        ;; no pattern, remove all highlights
+        (mapc #'delete-overlay old-ovs)
+        (evil-ex-hl-set-overlays hl new-ovs))
+      (when (evil-ex-hl-update-hook hl)
+        (funcall (evil-ex-hl-update-hook hl) hl result)))))
+
+(defun evil-ex-search-find-next-pattern (pattern &optional direction)
+  "Look for the next occurrence of PATTERN in a certain DIRECTION.
+Note that this function ignores the whole-line property of PATTERN."
+  (setq direction (or direction 'forward))
+  (let ((case-fold-search (evil-ex-pattern-ignore-case pattern)))
+    (cond
+     ((eq direction 'forward)
+      (re-search-forward (evil-ex-pattern-regex pattern) nil t))
+     ((eq direction 'backward)
+      (let* ((pnt (point))
+             (ret (re-search-backward (evil-ex-pattern-regex pattern) nil t))
+             (m (and ret (match-data))))
+        (if ret
+            (forward-char)
+          (goto-char (point-min)))
+        (let ((fwdret
+               (re-search-forward (evil-ex-pattern-regex pattern) nil t)))
+          (cond
+           ((and fwdret (< (match-beginning 0) pnt))
+            (setq ret fwdret)
+            (goto-char (match-beginning 0)))
+           (ret
+            (set-match-data m)
+            (goto-char (match-beginning 0)))
+           (t
+            (goto-char pnt)
+            ret)))))
+     (t
+      (user-error "Unknown search direction: %s" direction)))))
+
+(defun evil-ex-hl-idle-update ()
+  "Triggers the timer to update the highlights in the current buffer."
+  (when (and evil-ex-interactive-search-highlight
+             evil-ex-active-highlights-alist)
+    (when evil-ex-hl-update-timer
+      (cancel-timer evil-ex-hl-update-timer))
+    (setq evil-ex-hl-update-timer
+          (run-at-time evil-ex-hl-update-delay nil
+                       #'evil-ex-hl-do-update-highlight
+                       (current-buffer)))))
+
+(defun evil-ex-hl-do-update-highlight (&optional buffer)
+  "Timer function for updating the highlights."
+  (when (buffer-live-p buffer)
+    (with-current-buffer buffer
+      (evil-ex-hl-update-highlights)))
+  (setq evil-ex-hl-update-timer nil))
+
+(defun evil-ex-hl-update-highlights-scroll (win beg)
+  "Update highlights after scrolling in some window."
+  (with-current-buffer (window-buffer win)
+    (evil-ex-hl-idle-update)))
+(put 'evil-ex-hl-update-highlights-scroll 'permanent-local-hook t)
+
+(defun evil-ex-hl-update-highlights-resize (frame)
+  "Update highlights after resizing a window."
+  (let ((buffers (delete-dups (mapcar #'window-buffer (window-list frame)))))
+    (dolist (buf buffers)
+      (with-current-buffer buf
+        (evil-ex-hl-idle-update)))))
+(put 'evil-ex-hl-update-highlights-resize 'permanent-local-hook t)
+
+;; interactive search
+(defun evil-ex-search-activate-highlight (pattern)
+  "Activate highlighting of the search pattern set to PATTERN.
+This function does nothing if `evil-ex-search-interactive' or
+`evil-ex-search-highlight-all' is nil. "
+  (when (and evil-ex-search-interactive evil-ex-search-highlight-all)
+    (with-current-buffer (or evil-ex-current-buffer (current-buffer))
+      (unless (evil-ex-hl-active-p 'evil-ex-search)
+        (evil-ex-make-hl 'evil-ex-search
+                         :win (minibuffer-selected-window)))
+      (if pattern
+          (evil-ex-hl-change 'evil-ex-search pattern)))))
+
+(defun evil-ex-search (&optional count)
+  "Search forward or backward COUNT times for the current ex search pattern.
+The search pattern is determined by `evil-ex-search-pattern' and
+the direcion is determined by `evil-ex-search-direction'."
+  (setq evil-ex-search-start-point (point)
+        evil-ex-last-was-search t
+        count (or count 1))
+  (let ((orig (point))
+        wrapped)
+    (dotimes (i (or count 1))
+      (when (eq evil-ex-search-direction 'forward)
+        (unless (eobp) (forward-char))
+        ;; maybe skip end-of-line
+        (when (and evil-move-cursor-back (eolp) (not (eobp)))
+          (forward-char)))
+      (let ((res (evil-ex-find-next nil nil (not evil-search-wrap))))
+        (cond
+         ((not res)
+          (goto-char orig)
+          (signal 'search-failed
+                  (list (evil-ex-pattern-regex evil-ex-search-pattern))))
+         ((eq res 'wrapped) (setq wrapped t)))))
+    (if wrapped
+        (let (message-log-max)
+          (message "Search wrapped")))
+    (goto-char (match-beginning 0))
+    (setq evil-ex-search-match-beg (match-beginning 0)
+          evil-ex-search-match-end (match-end 0))
+    (evil-ex-search-goto-offset evil-ex-search-offset)
+    (evil-ex-search-activate-highlight evil-ex-search-pattern)))
+
+(defun evil-ex-find-next (&optional pattern direction nowrap)
+  "Search for the next occurrence of the PATTERN in DIRECTION.
+PATTERN must be created using `evil-ex-make-pattern', DIRECTION
+is either 'forward or 'backward. If NOWRAP is non nil, the search
+does not wrap at buffer boundaries. Furthermore this function
+only searches invisible text if `search-invisible' is t. If
+PATTERN is not specified the current global pattern
+`evil-ex-search-pattern' and if DIRECTION is not specified the
+current global direction `evil-ex-search-direction' is used.
+This function returns t if the search was successful, nil if it
+was unsuccessful and 'wrapped if the search was successful but
+has been wrapped at the buffer boundaries."
+  (setq pattern (or pattern evil-ex-search-pattern)
+        direction (or direction evil-ex-search-direction))
+  (unless (and pattern (evil-ex-pattern-regex pattern))
+    (signal 'search-failed (list "No search pattern")))
+  (catch 'done
+    (let (wrapped)
+      (while t
+        (let ((search-result (evil-ex-search-find-next-pattern pattern
+                                                               direction)))
+          (cond
+           ((and search-result
+                 (or (eq search-invisible t)
+                     (not (isearch-range-invisible
+                           (match-beginning 0) (match-end 0)))))
+            ;; successful search and not invisible
+            (throw 'done (if wrapped 'wrapped t)))
+           ((not search-result)
+            ;; unsuccessful search
+            (if nowrap
+                (throw 'done nil)
+              (setq nowrap t
+                    wrapped t)
+              (goto-char (if (eq direction 'forward)
+                             (point-min)
+                           (point-max)))))))))))
+
+(defun evil-ex-search-update (pattern offset beg end message)
+  "Update the highlighting and info-message for the search pattern.
+PATTERN is the search pattern and OFFSET the associated offset.
+BEG and END specifiy the current match, MESSAGE is the info
+message to be shown. This function does nothing if
+`evil-ex-search-interactive' is nil."
+  (when evil-ex-search-interactive
+    (cond
+     ((and beg end)
+      ;; update overlay
+      (if evil-ex-search-overlay
+          (move-overlay evil-ex-search-overlay beg end)
+        (setq evil-ex-search-overlay
+              (make-overlay beg end))
+        (overlay-put evil-ex-search-overlay 'priority 1001)
+        (overlay-put evil-ex-search-overlay 'face 'evil-ex-search))
+      ;; move point
+      (goto-char beg)
+      (evil-ex-search-goto-offset offset)
+      ;; update highlights
+      (when evil-ex-search-highlight-all
+        (evil-ex-hl-change 'evil-ex-search pattern)))
+     (t
+      ;; no match
+      (when evil-ex-search-overlay
+        ;; remove overlay
+        (delete-overlay evil-ex-search-overlay)
+        (setq evil-ex-search-overlay nil))
+      ;; no highlights
+      (when evil-ex-search-highlight-all
+        (evil-ex-hl-change 'evil-ex-search nil))
+      ;; and go to initial position
+      (goto-char evil-ex-search-start-point)))
+    (when (stringp message)
+      (evil-ex-echo "%s" message))))
+
+(defun evil-ex-search-start-session ()
+  "Initialize Ex for interactive search."
+  (remove-hook 'minibuffer-setup-hook #'evil-ex-search-start-session)
+  (add-hook 'after-change-functions #'evil-ex-search-update-pattern nil t)
+  (add-hook 'minibuffer-exit-hook #'evil-ex-search-stop-session)
+  (evil-ex-search-activate-highlight nil))
+(put 'evil-ex-search-start-session 'permanent-local-hook t)
+
+(defun evil-ex-search-stop-session ()
+  "Stop interactive search."
+  (with-current-buffer evil-ex-current-buffer
+    ;; TODO: This is a bad fix to remove duplicates. The duplicates
+    ;;       exist because `isearch-range-invisible' may add a single
+    ;;       overlay multiple times if we are in an unlucky situation
+    ;;       of overlapping overlays. This happens in our case because
+    ;;       of the overlays that are used for (lazy) highlighting.
+    ;;       Perhaps it would be better to disable those overlays
+    ;;       temporarily before calling `isearch-range-invisible'.
+    (setq isearch-opened-overlays (delete-dups isearch-opened-overlays))
+    (isearch-clean-overlays))
+  (remove-hook 'minibuffer-exit-hook #'evil-ex-search-stop-session)
+  (remove-hook 'after-change-functions #'evil-ex-search-update-pattern t)
+  (when evil-ex-search-overlay
+    (delete-overlay evil-ex-search-overlay)
+    (setq evil-ex-search-overlay nil)))
+(put 'evil-ex-search-stop-session 'permanent-local-hook t)
+
+(defun evil-ex-split-search-pattern (pattern direction)
+  "Split PATTERN in regexp, offset and next-pattern parts.
+Returns a triple (regexp  offset next-search)."
+  (save-match-data
+    (if (or (and (eq direction 'forward)
+                 (string-match "\\(?:^\\|[^\\\\]\\)\\(?:\\\\\\\\\\)*\\(/\\([^;]*\\)\\(?:;\\([/?].*\\)?\\)?\\)?$"
+                               pattern))
+            (and (eq direction 'backward)
+                 (string-match "\\(?:^\\|[^\\\\]\\)\\(?:\\\\\\\\\\)*\\(\\?\\([^;]*\\)\\(?:;\\([/?].*\\)?\\)?\\)?$"
+                               pattern)))
+        (list (substring pattern 0 (match-beginning 1))
+              (match-string 2 pattern)
+              (match-string 3 pattern))
+      (list pattern nil nil))))
+
+(defun evil-ex-search-full-pattern (pattern-string count direction)
+  "Search for a full search pattern PATTERN-STRING in DIRECTION.
+This function split PATTERN-STRING in
+pattern/offset/;next-pattern parts and performs the search in
+DIRECTION which must be either 'forward or 'backward. The first
+search is repeated COUNT times. If the pattern part of
+PATTERN-STRING is empty, the last global pattern stored in
+`evil-ex-search-pattern' is used instead if in addition the
+offset part is nil (i.e. no pattern/offset separator), the last
+global offset stored in `evil-ex-search-offset' is used as
+offset. The current match data will correspond to the last
+successful match.  This function returns a triple (RESULT PATTERN
+OFFSET) where RESULT is
+
+  t              the search has been successful without wrap
+  'wrap          the search has been successful with wrap
+  'empty-pattern the last pattern has been empty
+  nil            the search has not been successful
+
+and PATTERN and OFFSET are the last pattern and offset this
+function searched for. Note that this function does not handle
+any error conditions."
+  (setq count (or count 1))
+  (catch 'done
+    (while t
+      (let* ((res (evil-ex-split-search-pattern pattern-string direction))
+             (pat (pop res))
+             (offset (pop res))
+             (next-pat (pop res)))
+        ;; use last pattern of no new pattern has been specified
+        (if (not (zerop (length pat)))
+            (setq pat (evil-ex-make-search-pattern pat))
+          (setq pat evil-ex-search-pattern
+                offset (or offset evil-ex-search-offset)))
+        (when (zerop (length pat))
+          (throw 'done (list 'empty-pattern pat offset)))
+        (let (search-result)
+          (while (> count 0)
+            (let ((result (evil-ex-find-next pat direction
+                                             (not evil-search-wrap))))
+              (if (not result) (setq search-result nil count 0)
+                (setq search-result
+                      (if (or (eq result 'wrap)
+                              (eq search-result 'wrap))
+                          'wrap t)
+                      count (1- count)))))
+          (cond
+           ;; search failed
+           ((not search-result) (throw 'done (list nil pat offset)))
+           ;; no next pattern, search complete
+           ((zerop (length next-pat))
+            (evil-ex-search-goto-offset offset)
+            (throw 'done (list search-result pat offset)))
+           ;; next pattern but empty
+           ((= 1 (length next-pat))
+            (evil-ex-search-goto-offset offset)
+            (throw 'done (list 'empty-pattern pat offset)))
+           ;; next non-empty pattern, next search iteration
+           (t
+            (evil-ex-search-goto-offset offset)
+            (setq count 1
+                  pattern-string (substring next-pat 1)
+                  direction (if (= (aref next-pat 0) ?/)
+                                'forward
+                              'backward)))))))))
+
+(defun evil-ex-search-update-pattern (beg end range)
+  "Update the current search pattern."
+  (save-match-data
+    (let ((pattern-string (minibuffer-contents)))
+      (with-current-buffer evil-ex-current-buffer
+        (with-selected-window (minibuffer-selected-window)
+          (goto-char (1+ evil-ex-search-start-point))
+          (condition-case err
+              (let* ((result (evil-ex-search-full-pattern pattern-string
+                                                          (or evil-ex-search-count 1)
+                                                          evil-ex-search-direction))
+                     (success (pop result))
+                     (pattern (pop result))
+                     (offset (pop result)))
+                (cond
+                 ((eq success 'wrap)
+                  (evil-ex-search-update pattern offset
+                                         (match-beginning 0) (match-end 0)
+                                         "Wrapped"))
+                 ((eq success 'empty-pattern)
+                  (evil-ex-search-update nil nil nil nil nil))
+                 (success
+                  (evil-ex-search-update pattern offset
+                                         (match-beginning 0) (match-end 0)
+                                         nil))
+                 (t
+                  (evil-ex-search-update nil nil
+                                         nil nil
+                                         "search failed"))))
+            (invalid-regexp
+             (evil-ex-search-update nil nil nil nil (cadr err)))
+            (error
+             (evil-ex-search-update nil nil nil nil (format "%s" err)))))))))
+(put 'evil-ex-search-update-pattern 'permanent-local-hook t)
+
+(defun evil-ex-search-exit ()
+  "Exit interactive search, keeping lazy highlighting active."
+  (interactive)
+  (evil-ex-search-stop-session)
+  (exit-minibuffer))
+
+(defun evil-ex-search-abort ()
+  "Abort interactive search, disabling lazy highlighting."
+  (interactive)
+  (evil-ex-search-stop-session)
+  (evil-ex-delete-hl 'evil-ex-search)
+  (abort-recursive-edit))
+
+(defun evil-ex-search-goto-offset (offset)
+  "Move point according to search OFFSET and set `evil-this-type' accordingly.
+This function assumes that the current match data represents the
+current search result."
+  (unless (zerop (length offset))
+    (let ((beg (match-beginning 0))
+          (end (match-end 0)))
+      (save-match-data
+        (unless
+            (string-match
+             "^\\([esb]\\)?\\(\\([-+]\\)?\\([0-9]*\\)\\)$"
+             offset)
+          (user-error "Invalid search offset: %s" offset))
+        (let ((count (if (= (match-beginning 4) (match-end 4))
+                         (cond
+                          ((not (match-beginning 3)) 0)
+                          ((= (aref offset (match-beginning 3)) ?+) +1)
+                          (t -1))
+                       (string-to-number (match-string 2 offset)))))
+          (cond
+           ((not (match-beginning 1))
+            (setq evil-this-type 'line)
+            (forward-line count))
+           ((= (aref offset (match-beginning 1)) ?e)
+            (goto-char (+ end count -1))
+            (setq evil-this-type 'inclusive))
+           ((memq (aref offset (match-beginning 1)) '(?s ?b))
+            (goto-char (+ beg count))
+            (setq evil-this-type 'inclusive))))))))
+
+(defun evil-ex-search-setup ()
+  "Hook to initialize the minibuffer for ex search."
+  (add-hook 'pre-command-hook #'evil-ex-remove-default))
+
+(defun evil-ex-start-search (direction count)
+  "Start a new search in a certain DIRECTION."
+  ;; store buffer and window where the search started
+  (let ((evil-ex-current-buffer (current-buffer)))
+    (setq evil-ex-search-count count
+          evil-ex-search-direction direction
+          evil-ex-search-start-point (point)
+          evil-ex-last-was-search t)
+    (progn
+      ;; ensure minibuffer is initialized accordingly
+      (add-hook 'minibuffer-setup-hook #'evil-ex-search-start-session)
+      ;; read the search string
+      (let* ((minibuffer-local-map evil-ex-search-keymap)
+             (search-string
+              (condition-case err
+                  (minibuffer-with-setup-hook
+                      #'evil-ex-search-setup
+                    (read-string (if (eq evil-ex-search-direction 'forward)
+                                     "/" "?")
+                                 (and evil-ex-search-history
+                                      (propertize
+                                       (car evil-ex-search-history)
+                                       'face 'shadow))
+                                 'evil-ex-search-history))
+                (quit
+                 (evil-ex-search-stop-session)
+                 (evil-ex-delete-hl 'evil-ex-search)
+                 (goto-char evil-ex-search-start-point)
+                 (signal (car err) (cdr err))))))
+        ;; pattern entered successful
+        (goto-char (1+ evil-ex-search-start-point))
+        (let* ((result
+                (evil-ex-search-full-pattern search-string
+                                             evil-ex-search-count
+                                             evil-ex-search-direction))
+               (success (pop result))
+               (pattern (pop result))
+               (offset (pop result)))
+          (setq evil-ex-search-pattern pattern
+                evil-ex-search-offset offset)
+          (cond
+           ((memq success '(t wrap))
+            (goto-char (match-beginning 0))
+            (setq evil-ex-search-match-beg (match-beginning 0)
+                  evil-ex-search-match-end (match-end 0))
+            (evil-ex-search-goto-offset offset)
+            (evil-push-search-history search-string (eq direction 'forward))
+            (unless evil-ex-search-persistent-highlight
+              (evil-ex-delete-hl 'evil-ex-search)))
+           (t
+            (goto-char evil-ex-search-start-point)
+            (evil-ex-delete-hl 'evil-ex-search)
+            (signal 'search-failed (list search-string)))))))))
+
+(defun evil-ex-start-word-search (unbounded direction count &optional symbol)
+  "Search for the symbol under point.
+The search matches the COUNT-th occurrence of the word.  If the
+UNBOUNDED argument is nil, the search matches only at symbol
+boundaries, otherwise it matches anywhere.  The DIRECTION
+argument should be either `forward' or `backward', determining
+the search direction. If SYMBOL is non-nil then the functions
+searches for the symbol at point, otherwise for the word at
+point."
+  (let ((string (evil-find-thing (eq direction 'forward)
+                                 (if symbol 'symbol 'word))))
+    (if (null string)
+        (user-error "No word under point")
+      (let ((regex (if unbounded
+                       (regexp-quote string)
+                     (format (if symbol "\\_<%s\\_>" "\\<%s\\>")
+                             (regexp-quote string)))))
+        (setq evil-ex-search-count count
+              evil-ex-search-direction direction
+              evil-ex-search-pattern
+              (evil-ex-make-search-pattern regex)
+              evil-ex-search-offset nil
+              evil-ex-last-was-search t)
+        ;; update search history unless this pattern equals the
+        ;; previous pattern
+        (unless (equal (car-safe evil-ex-search-history) regex)
+          (push regex evil-ex-search-history))
+        (evil-push-search-history regex (eq direction 'forward)))
+      (evil-ex-delete-hl 'evil-ex-search)
+      (when (fboundp 'evil-ex-search-next)
+        (evil-ex-search-next count)))))
+
+;; substitute
+(evil-ex-define-argument-type substitution
+  "A substitution pattern argument /pattern/replacement/flags.
+This handler highlights the pattern of the current substitution."
+  :runner
+  (lambda (flag &optional arg)
+    (with-selected-window (minibuffer-selected-window)
+      (with-current-buffer evil-ex-current-buffer
+        (cond
+         ((eq flag 'start)
+          (evil-ex-make-hl
+           'evil-ex-substitute
+           :face 'evil-ex-substitute-matches
+           :update-hook #'evil-ex-pattern-update-ex-info
+           :match-hook (and evil-ex-substitute-interactive-replace
+                            #'evil-ex-pattern-update-replacement))
+          (setq flag 'update))
+
+         ((eq flag 'stop)
+          (evil-ex-delete-hl 'evil-ex-substitute))))
+
+      (when (and (eq flag 'update)
+                 evil-ex-substitute-highlight-all
+                 (not (zerop (length arg))))
+        (condition-case lossage
+            (let* ((result (evil-ex-get-substitute-info arg t))
+                   (pattern (pop result))
+                   (replacement (pop result))
+                   (range (or (evil-copy-range evil-ex-range)
+                              (evil-range (line-beginning-position)
+                                          (line-end-position)
+                                          'line
+                                          :expanded t))))
+              (setq evil-ex-substitute-current-replacement replacement)
+              (evil-expand-range range)
+              (evil-ex-hl-set-region 'evil-ex-substitute
+                                     (evil-range-beginning range)
+                                     (evil-range-end range))
+              (evil-ex-hl-change 'evil-ex-substitute pattern))
+          (end-of-file
+           (evil-ex-pattern-update-ex-info nil
+                                           "incomplete replacement"))
+          (user-error
+           (evil-ex-pattern-update-ex-info nil
+                                           (format "%s" lossage))))))))
+
+(defun evil-ex-pattern-update-ex-info (hl result)
+  "Update the Ex info string."
+  (when (stringp result)
+    (evil-ex-echo "%s" result)))
+
+(defun evil-ex-pattern-update-replacement (hl overlay)
+  "Update the replacement display."
+  (when (fboundp 'match-substitute-replacement)
+    (let ((fixedcase (not case-replace))
+          repl)
+      (setq repl (if evil-ex-substitute-current-replacement
+                     (evil-match-substitute-replacement
+                      evil-ex-substitute-current-replacement
+                      fixedcase)
+                   ""))
+      (put-text-property 0 (length repl)
+                         'face 'evil-ex-substitute-replacement
+                         repl)
+      (overlay-put overlay 'after-string repl))))
+
+(defun evil-ex-parse-global (string)
+  "Parse STRING as a global argument."
+  (let* ((args (evil-delimited-arguments string 2))
+         (pattern (nth 0 args))
+         (command (nth 1 args)))
+    ;; use last pattern if none given
+    (when (zerop (length pattern))
+      (setq pattern
+            (cond
+             ((and (eq evil-search-module 'evil-search) evil-ex-search-pattern)
+              (evil-ex-pattern-regex evil-ex-search-pattern))
+             ((and (eq evil-search-module 'isearch) (not (zerop (length isearch-string))))
+              isearch-string)
+             (t (user-error "No previous pattern")))))
+    (list pattern command)))
+
+(defun evil-ex-get-substitute-info (string &optional implicit-r)
+  "Returns the substitution info of command line STRING.
+This function returns a three-element list \(PATTERN REPLACEMENT
+FLAGS) consisting of the substitution parts of STRING. PATTERN is
+a ex-pattern (see `evil-ex-make-pattern') and REPLACEMENT in a
+compiled replacement expression (see `evil-compile-replacement').
+The information returned is the actual substitution information
+w.r.t. to special situations like empty patterns or repetition of
+previous substitution commands. If IMPLICIT-R is non-nil, then
+the flag 'r' is assumed, i.e. in the case of an empty pattern the
+last search pattern is used. This will be used when called from
+a :substitute command with arguments."
+  (let (pattern replacement flags)
+    (cond
+     ((or (null string) (string-match "^[a-zA-Z]" string))
+      ;; starts with letter so there is no pattern because the
+      ;; separator must not be a letter repeat last substitute
+      (setq replacement evil-ex-substitute-replacement)
+      ;; flags are everything that is not a white space
+      (when (and string (string-match "[^[:space:]]+" string))
+        (setq flags (match-string 0 string))))
+     (t
+      (let ((args (evil-delimited-arguments string 3)))
+        (setq pattern (pop args)
+              replacement (pop args)
+              flags (pop args))
+        ;; if replacment equals "~" use previous replacement
+        (if (equal replacement "~")
+            (setq replacement evil-ex-substitute-replacement)
+          (setq replacement (evil-compile-replacement replacement)))
+        ;; append implicit "r" flag if required
+        (when (and implicit-r (not (memq ?r (append flags nil))))
+          (setq flags (concat flags "r"))))))
+    ;; if flags equals "&" add previous flags
+    (if (and (not (zerop (length flags)))
+             (= (aref flags 0) ?&))
+        (setq flags (append (substring flags 1)
+                            evil-ex-substitute-flags))
+      (setq flags (append flags nil)))
+    ;; if no pattern, use previous pattern, either search or
+    ;; substitute pattern depending on `evil-ex-last-was-search' and
+    ;; the r flag
+    (when (zerop (length pattern))
+      (setq pattern
+            (if (eq evil-search-module 'evil-search)
+                (if (and evil-ex-last-was-search (memq ?r flags))
+                    (and evil-ex-search-pattern
+                         (evil-ex-pattern-regex evil-ex-search-pattern))
+                  (and evil-ex-substitute-pattern
+                       (evil-ex-pattern-regex evil-ex-substitute-pattern)))
+              (if (eq case-fold-search t)
+                  isearch-string
+                (concat isearch-string "\\C")))
+            flags (remq ?r flags)))
+    ;; generate pattern
+    (when pattern
+      (setq pattern (evil-ex-make-substitute-pattern pattern flags)))
+    (list pattern replacement flags)))
+
+(defun evil-ex-nohighlight ()
+  "Disable the active search highlightings."
+  (interactive)
+  (evil-ex-delete-hl 'evil-ex-substitute)
+  (evil-ex-delete-hl 'evil-ex-search))
+
+(provide 'evil-search)
+
+;;; evil-search.el ends here