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(require 'cl)
(defvar oog-idle-delay 0.5)
(defvar oog-minimum-input-length 3)
(defvar oog-map
(let ((map (copy-keymap minibuffer-local-map)))
(define-key map (kbd "<down>") 'oog-next-line)
(define-key map (kbd "<up>") 'oog-previous-line)
(define-key map (kbd "<prior>") 'oog-previous-page)
(define-key map (kbd "<next>") 'oog-next-page)
map))
(defvar oog-history-list nil)
(defun oog-previous-line ()
(interactive)
(oog-move-selection 'forward-line -1))
(defun oog-next-line ()
(interactive)
(oog-move-selection 'forward-line 1))
(defun oog-previous-page ()
(interactive)
(oog-move-selection 'scroll-down nil))
(defun oog-next-page ()
(interactive)
(oog-move-selection 'scroll-up nil))
(defun oog-move-selection (movefunc movearg)
(let ((win (get-buffer-window "*Occur*")))
(if win
(with-selected-window win
(condition-case nil
(funcall movefunc movearg)
(beginning-of-buffer (goto-char (point-min)))
(end-of-buffer (goto-char (point-max))))))))
(defun oog-check-input ()
(when (sit-for oog-idle-delay)
(unless (equal (minibuffer-contents) oog-current-input)
(setq oog-current-input (minibuffer-contents))
(if (< (length oog-current-input) oog-minimum-input-length)
(let ((win (get-buffer-window "*Occur*")))
(if win
(with-selected-window win
(setq buffer-read-only nil)
(erase-buffer))))
(save-excursion
(flet ((message (&rest args) nil))
(multi-occur
(remove nil (mapcar (lambda (buffer)
(with-current-buffer buffer
(if (eq major-mode 'org-mode)
buffer)))
(buffer-list)))
oog-current-input))
(if (get-buffer "*Occur*")
(let ((win (get-buffer-window "*Occur*")))
(if win
(with-selected-window win
(forward-line))))
(message "No matches.")))))))
(defun oog ()
(interactive)
(let ((cursor-in-non-selected-windows 'box)
marker)
(save-window-excursion
(add-hook 'post-command-hook 'oog-check-input)
(setq oog-current-input nil)
(unwind-protect
(let ((minibuffer-local-map oog-map))
(read-string "string: " nil 'oog-history-list))
(remove-hook 'post-command-hook 'oog-check-input))
(let ((buf (get-buffer "*Occur*")))
(if buf
(with-current-buffer buf
(unless (= (buffer-size) 0)
(setq marker (occur-mode-find-occurrence)))))))
(switch-to-buffer (marker-buffer marker))
(goto-char marker)
(when (outline-invisible-p)
(save-excursion
(outline-previous-visible-heading 1)
(org-show-subtree)))))