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;;; init-ace.el --- Configuration for AceJump-inspired friends

;; Copyright (C) 2012-2016 Kyle Meyer <kyle@kyleam.com>

;; Author: Kyle Meyer <kyle@kyleam.com>
;; URL: https://github.com/kyleam/emacs.d

;; This program 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.

;; This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.

;;; Code:

;;; Avy

(require 'avy)

(key-chord-define-global "jf" 'avy-goto-subword-1)
(define-key isearch-mode-map (kbd "C-'") 'avy-isearch)

;;; Ace Link

(defun km/ace-link-dired ()
  "Ace jump to files in dired buffers."
  (interactive)
  (avy-with km/ace-link-dired
    (setq avy-action
          (lambda (pt)
            (goto-char pt)
            (org-open-file (dired-get-filename))))
    (avy--process
     (km/ali--dired-collect-references)
     #'avy--overlay-post)))

(defun km/ali--dired-collect-references ()
  (let ((end (window-end))
        points)
    (save-excursion
      (goto-char (window-start))
      (while (< (point) end)
        (--when-let (dired-next-line 1)
          (push it points)))
      (nreverse points))))

(defun km/ace-link-widget ()
  "Press a widget that is visible in the current buffer.
This can be used in place of `ace-link-gnus' and has the
advantage of working for gwene buffers in addition to normal mail
buffers because it doesn't rely on the 'gnus-string' text
property."
  (interactive)
  (when (eq major-mode 'gnus-summary-mode)
    (gnus-summary-widget-forward 1))
  (avy-with km/ace-link-widget
    (setq avy-action
          (lambda (pt)
            (goto-char (1+ pt))
            (widget-button-press (point))))
    (avy--process
     (km/ali--widget-collect-references)
     #'avy--overlay-post)))

(defun km/ali--widget-collect-references ()
  "Collect the positions of visible widgets in buffer."
  (require 'wid-edit)
  (let (candidates pt)
    (save-excursion
      (save-restriction
        (narrow-to-region
         (window-start)
         (window-end))
        (goto-char (point-min))
        (setq pt (point))
        (while (progn (ignore-errors (widget-forward 1))
                      (> (point) pt))
          (setq pt (point))
          (push (point) candidates))
        (nreverse candidates)))))

(ace-link-setup-default)
(after 'org
 (define-key org-mode-map (kbd "C-c m o") 'ace-link-org))
(after 'dired
  ;; This overrides the binding for `dired-find-file-other-window'.
  (define-key dired-mode-map "o" 'km/ace-link-dired)
  (define-key dired-mode-map "r" 'dired-find-file-other-window))

;;; Ace Window

(setq aw-keys '(?a ?s ?d ?f ?g ?h ?j ?k ?l)
      aw-scope 'frame)

(defun km/ace-window (arg)
  "Run `ace-window', swapping single and double C-u's."
  (interactive "p")
  (cl-case arg
    (4  (setq arg 16))
    (16 (setq arg 4)))
  (ace-window arg))

(key-chord-define-global "jw" 'km/ace-window)

(provide 'init-ace)
;;; init-ace.el ends here