;;; neotree.el --- A tree plugin like NerdTree for Vim

;; Copyright (C) 2014 jaypei

;; Author: jaypei <jaypei97159@gmail.com>
;; URL: https://github.com/jaypei/emacs-neotree
;; Version: 0.5
;; Package-Requires: ((cl-lib "0.5"))

;; 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/>.

;;; Commentary:

;; To use this file, put something like the following in your
;; ~/.emacs:
;;
;; (add-to-list 'load-path "/directory/containing/neotree/")
;; (require 'neotree)
;;
;; Type M-x neotree to start.
;;
;; To set options for NeoTree, type M-x customize, then select
;; Applications, NeoTree.
;;

;;; Code:

(require 'cl-lib)

;;
;; Constants
;;

(defconst neo-buffer-name " *NeoTree*"
  "Name of the buffer where neotree shows directory contents.")

(defconst neo-dir
  (expand-file-name (if load-file-name
                        (file-name-directory load-file-name)
                      default-directory)))

(defconst neo-header-height 5)

(eval-and-compile

  ;; Added in Emacs 24.3
  (unless (fboundp 'user-error)
    (defalias 'user-error 'error))

  ;; Added in Emacs 24.3 (mirrors/emacs@b335efc3).
  (unless (fboundp 'setq-local)
    (defmacro setq-local (var val)
      "Set variable VAR to value VAL in current buffer."
      (list 'set (list 'make-local-variable (list 'quote var)) val)))

  ;; Added in Emacs 24.3 (mirrors/emacs@b335efc3).
  (unless (fboundp 'defvar-local)
    (defmacro defvar-local (var val &optional docstring)
      "Define VAR as a buffer-local variable with default value VAL.
Like `defvar' but additionally marks the variable as being automatically
buffer-local wherever it is set."
      (declare (debug defvar) (doc-string 3))
      (list 'progn (list 'defvar var val docstring)
            (list 'make-variable-buffer-local (list 'quote var))))))

;; Add autoload function for vc (#153).
(autoload 'vc-responsible-backend "vc.elc")

;;
;; Macros
;;

(defmacro neo-util--to-bool (obj)
  "If OBJ is non-nil, return t, else return nil."
  `(and ,obj t))

(defmacro neo-global--with-buffer (&rest body)
  "Execute the forms in BODY with global NeoTree buffer."
  (declare (indent 0) (debug t))
  `(let ((neotree-buffer (neo-global--get-buffer)))
     (unless (null neotree-buffer)
       (with-current-buffer neotree-buffer
         ,@body))))

(defmacro neo-global--with-window (&rest body)
  "Execute the forms in BODY with global NeoTree window."
  (declare (indent 0) (debug t))
  `(save-selected-window
     (neo-global--select-window)
     ,@body))

(defmacro neo-global--when-window (&rest body)
  "Execute the forms in BODY when selected window is NeoTree window."
  (declare (indent 0) (debug t))
  `(when (eq (selected-window) neo-global--window)
     ,@body))

(defmacro neo-global--switch-to-buffer ()
  "Switch to NeoTree buffer."
  `(let ((neotree-buffer (neo-global--get-buffer)))
     (unless (null neotree-buffer)
       (switch-to-buffer neotree-buffer))))

(defmacro neo-buffer--with-editing-buffer (&rest body)
  "Execute BODY in neotree buffer without read-only restriction."
  `(let (rlt)
     (neo-global--with-buffer
       (setq buffer-read-only nil)
       (setq rlt (progn ,@body))
       (setq buffer-read-only t))
     rlt))

(defmacro neo-buffer--with-resizable-window (&rest body)
  "Execute BODY in neotree window without `window-size-fixed' restriction."
  `(let (rlt)
     (neo-global--with-buffer
       (neo-buffer--unlock-width))
     (setq rlt (progn ,@body))
     (neo-global--with-buffer
       (neo-buffer--lock-width))
     rlt))

(defmacro neotree-make-executor (&rest fn-form)
  "Make an open event handler, FN-FORM is event handler form."
  (let* ((get-args-fn
          (lambda (sym) (or (plist-get fn-form sym) (lambda (&rest _)))))
         (file-fn (funcall get-args-fn :file-fn))
         (dir-fn (funcall get-args-fn :dir-fn)))
    `(lambda (&optional arg)
       (interactive "P")
       (neo-global--select-window)
       (neo-buffer--execute arg ,file-fn ,dir-fn))))


;;
;; Customization
;;

(defgroup neotree nil
  "Options for neotree."
  :prefix "neo-"
  :group 'files)

(defgroup neotree-vc-options nil
  "Neotree-VC customizations."
  :prefix "neo-vc-"
  :group 'neotree
  :link '(info-link "(neotree)Configuration"))

(defgroup neotree-confirmations nil
  "Neotree confirmation customizations."
  :prefix "neo-confirm-"
  :group 'neotree)

(defcustom neo-window-position 'left
  "*The position of NeoTree window."
  :group 'neotree
  :type '(choice (const left)
                 (const right)))

(defcustom neo-display-action '(neo-default-display-fn)
  "*Action to use for displaying NeoTree window.
If you change the action so it doesn't use
`neo-default-display-fn', then other variables such as
`neo-window-position' won't be respected when opening NeoTree
window."
  :type 'sexp
  :group 'neotree)

(defcustom neo-create-file-auto-open nil
  "*If non-nil, the file will auto open when created."
  :type 'boolean
  :group 'neotree)

(defcustom neo-banner-message nil
  "*The banner message of neotree window."
  :type 'string
  :group 'neotree)

(defcustom neo-show-updir-line t
  "*If non-nil, show the updir line (..)."
  :type 'boolean
  :group 'neotree)

(defcustom neo-theme 'classic
  "*The tree style to display.
`classic' use icon to display, it only it suitable for GUI mode.
`ascii' is the simplest style, it will use +/- to display the fold state,
it suitable for terminal.
`arrow' use unicode arrow.
`nerd' use the nerdtree indentation mode and arrow."
  :group 'neotree
  :type '(choice (const classic)
                 (const ascii)
                 (const arrow)
                 (const icons)
                 (const nerd)))

(defcustom neo-mode-line-type 'neotree
  "*The mode-line type to display, `default' is a non-modified mode-line, \
`neotree' is a compact mode-line that shows useful information about the
 current node like the parent directory and the number of nodes,
`custom' uses the format stored in `neo-mode-line-custom-format',
`none' hide the mode-line."
  :group 'neotree
  :type '(choice (const default)
                 (const neotree)
                 (const custom)
                 (const none)))

(defcustom neo-mode-line-custom-format nil
  "*If `neo-mode-line-type' is set to `custom', this variable specifiy \
the mode-line format."
  :type 'sexp
  :group 'neotree)

(defcustom neo-smart-open nil
  "*If non-nil, every time when the neotree window is opened, it will try to find current file and jump to node."
  :type 'boolean
  :group 'neotree)

(defcustom neo-show-hidden-files nil
  "*If non-nil, the hidden files are shown by default."
  :type 'boolean
  :group 'neotree)

(defcustom neo-autorefresh nil
  "*If non-nil, the neotree buffer will auto refresh."
  :type 'boolean
  :group 'neotree)

(defcustom neo-window-width 25
  "*Specifies the width of the NeoTree window."
  :type 'integer
  :group 'neotree)

(defcustom neo-window-fixed-size t
  "*If the neotree windows is fixed, it won't be resize when rebalance windows."
  :type 'boolean
  :group 'neotree)

(defcustom neo-keymap-style 'default
  "*The default keybindings for neotree-mode-map."
  :group 'neotree
  :type '(choice (const default)
                 (const concise)))

(defcustom neo-cwd-line-style 'text
  "*The default header style."
  :group 'neotree
  :type '(choice (const text)
                 (const button)))

(defcustom neo-help-echo-style 'default
  "The message NeoTree displays when the mouse moves onto nodes.
`default' means the node name is displayed if it has a
width (including the indent) larger than `neo-window-width', and
`none' means NeoTree doesn't display any messages."
  :group 'neotree
  :type '(choice (const default)
                 (const none)))

(defcustom neo-click-changes-root nil
  "*If non-nil, clicking on a directory will change the current root to the directory."
  :type 'boolean
  :group 'neotree)

(defcustom neo-auto-indent-point nil
  "*If non-nil the point is autmotically put on the first letter of a node."
  :type 'boolean
  :group 'neotree)

(defcustom neo-hidden-regexp-list
  '("^\\." "\\.pyc$" "~$" "^#.*#$" "\\.elc$")
  "*The regexp list matching hidden files."
  :type  '(repeat (choice regexp))
  :group 'neotree)

(defcustom neo-enter-hook nil
  "Functions to run if enter node occured."
  :type 'hook
  :group 'neotree)

(defcustom neo-after-create-hook nil
  "Hooks called after creating the neotree buffer."
  :type 'hook
  :group 'neotree)

(defcustom neo-vc-integration nil
  "If non-nil, show VC status."
  :group 'neotree-vc
  :type '(set (const :tag "Use different faces" face)
              (const :tag "Use different characters" char)))

(defcustom neo-vc-state-char-alist
  '((up-to-date       . ?\s)
    (edited           . ?E)
    (added            . ?+)
    (removed          . ?-)
    (missing          . ?!)
    (needs-merge      . ?M)
    (conflict         . ?!)
    (unlocked-changes . ?!)
    (needs-update     . ?U)
    (ignored          . ?\s)
    (user             . ?U)
    (unregistered     . ?\s)
    (nil              . ?\s))
  "Alist of vc-states to indicator characters.
This variable is used in `neo-vc-for-node' when
`neo-vc-integration' contains `char'."
  :group 'neotree-vc
  :type '(alist :key-type symbol
                :value-type character))

(defcustom neo-confirm-change-root 'yes-or-no-p
  "Confirmation asking for permission to change root if file was not found in root path."
  :type '(choice (function-item :tag "Verbose" yes-or-no-p)
                 (function-item :tag "Succinct" y-or-n-p)
                 (function-item :tag "Off" off-p))
  :group 'neotree-confirmations)

(defcustom neo-confirm-create-file 'yes-or-no-p
  "Confirmation asking whether *NeoTree* should create a file."
  :type '(choice (function-item :tag "Verbose" yes-or-no-p)
                 (function-item :tag "Succinct" y-or-n-p)
                 (function-item :tag "Off" off-p))
  :group 'neotree-confirmations)

(defcustom neo-confirm-create-directory 'yes-or-no-p
  "Confirmation asking whether *NeoTree* should create a directory."
  :type '(choice (function-item :tag "Verbose" yes-or-no-p)
                 (function-item :tag "Succinct" y-or-n-p)
                 (function-item :tag "Off" off-p))
  :group 'neotree-confirmations)

(defcustom neo-confirm-delete-file 'yes-or-no-p
  "Confirmation asking whether *NeoTree* should delete the file."
  :type '(choice (function-item :tag "Verbose" yes-or-no-p)
                 (function-item :tag "Succinct" y-or-n-p)
                 (function-item :tag "Off" off-p))
  :group 'neotree-confirmations)

(defcustom neo-confirm-delete-directory-recursively 'yes-or-no-p
  "Confirmation asking whether the directory should be deleted recursively."
  :type '(choice (function-item :tag "Verbose" yes-or-no-p)
                 (function-item :tag "Succinct" y-or-n-p)
                 (function-item :tag "Off" off-p))
  :group 'neotree-confirmations)

(defcustom neo-confirm-kill-buffers-for-files-in-directory 'yes-or-no-p
  "Confirmation asking whether *NeoTree* should kill buffers for the directory in question."
  :type '(choice (function-item :tag "Verbose" yes-or-no-p)
                 (function-item :tag "Succinct" y-or-n-p)
                 (function-item :tag "Off" off-p))
  :group 'neotree-confirmations)

(defcustom neo-toggle-window-keep-p nil
  "If not nil, not switch to *NeoTree* buffer when executing `neotree-toggle'."
  :type 'boolean
  :group 'neotree)

(defcustom neo-force-change-root nil
  "If not nil, do not prompt when switching root."
  :type 'boolean
  :group 'neotree)

(defcustom neo-filepath-sort-function 'string<
  "Function to be called when sorting neotree nodes."
  :type '(symbol (const :tag "Normal" string<)
                 (const :tag "Sort Hidden at Bottom" neo-sort-hidden-last)
                 (function :tag "Other"))
  :group 'neotree)

(defcustom neo-default-system-application "xdg-open"
  "*Name of the application that is used to open a file under point.
By default it is xdg-open."
  :type 'string
  :group 'neotree)

;;
;; Faces
;;

(defface neo-banner-face
  '((((background dark)) (:foreground "lightblue" :weight bold))
    (t                   (:foreground "DarkMagenta")))
  "*Face used for the banner in neotree buffer."
  :group 'neotree :group 'font-lock-highlighting-faces)
(defvar neo-banner-face 'neo-banner-face)

(defface neo-header-face
  '((((background dark)) (:foreground "White"))
    (t                   (:foreground "DarkMagenta")))
  "*Face used for the header in neotree buffer."
  :group 'neotree :group 'font-lock-highlighting-faces)
(defvar neo-header-face 'neo-header-face)

(defface neo-root-dir-face
  '((((background dark)) (:foreground "lightblue" :weight bold))
    (t                   (:foreground "DarkMagenta")))
  "*Face used for the root dir in neotree buffer."
  :group 'neotree :group 'font-lock-highlighting-faces)
(defvar neo-root-dir-face 'neo-root-dir-face)

(defface neo-dir-link-face
  '((((background dark)) (:foreground "DeepSkyBlue"))
    (t                   (:foreground "MediumBlue")))
  "*Face used for expand sign [+] in neotree buffer."
  :group 'neotree :group 'font-lock-highlighting-faces)
(defvar neo-dir-link-face 'neo-dir-link-face)

(defface neo-file-link-face
  '((((background dark)) (:foreground "White"))
    (t                   (:foreground "Black")))
  "*Face used for open file/dir in neotree buffer."
  :group 'neotree :group 'font-lock-highlighting-faces)
(defvar neo-file-link-face 'neo-file-link-face)

(defface neo-button-face
  '((t (:underline nil)))
  "*Face used for open file/dir in neotree buffer."
  :group 'neotree :group 'font-lock-highlighting-faces)
(defvar neo-button-face 'neo-button-face)

(defface neo-expand-btn-face
  '((((background dark)) (:foreground "SkyBlue"))
    (t                   (:foreground "DarkCyan")))
  "*Face used for open file/dir in neotree buffer."
  :group 'neotree :group 'font-lock-highlighting-faces)
(defvar neo-expand-btn-face 'neo-expand-btn-face)

(defface neo-vc-default-face
  '((((background dark)) (:foreground "White"))
    (t                   (:foreground "Black")))
  "*Face used for unknown files in the neotree buffer.
Used only when \(vc-state node\) returns nil."
  :group 'neotree-vc :group 'font-lock-highlighting-faces)
(defvar  neo-vc-default-face 'neo-vc-default-face)

(defface neo-vc-user-face
  '((t                   (:foreground "Red" :slant italic)))
  "*Face used for user-locked files in the neotree buffer."
  :group 'neotree-vc :group 'font-lock-highlighting-faces)
(defvar  neo-vc-user-face 'neo-vc-user-face)

(defface neo-vc-up-to-date-face
  '((((background dark)) (:foreground "LightGray"))
    (t                   (:foreground "DarkGray")))
  "*Face used for vc-up-to-date files in the neotree buffer."
  :group 'neotree-vc :group 'font-lock-highlighting-faces)
(defvar  neo-vc-up-to-date-face 'neo-vc-up-to-date-face)

(defface neo-vc-edited-face
  '((((background dark)) (:foreground "Magenta"))
    (t                   (:foreground "DarkMagenta")))
  "*Face used for vc-edited files in the neotree buffer."
  :group 'neotree-vc :group 'font-lock-highlighting-faces)
(defvar  neo-vc-edited-face 'neo-vc-edited-face)

(defface neo-vc-needs-update-face
  '((t                   (:underline t)))
  "*Face used for vc-needs-update files in the neotree buffer."
  :group 'neotree-vc :group 'font-lock-highlighting-faces)
(defvar  neo-vc-needs-update-face 'neo-vc-needs-update-face)

(defface neo-vc-needs-merge-face
  '((((background dark)) (:foreground "Red1"))
    (t                   (:foreground "Red3")))
  "*Face used for vc-needs-merge files in the neotree buffer."
  :group 'neotree-vc :group 'font-lock-highlighting-faces)
(defvar  neo-vc-needs-merge-face 'neo-vc-needs-merge-face)

(defface neo-vc-unlocked-changes-face
  '((t                   (:foreground "Red" :background "Blue")))
  "*Face used for vc-unlocked-changes files in the neotree buffer."
  :group 'neotree-vc :group 'font-lock-highlighting-faces)
(defvar  neo-vc-unlocked-changes-face 'neo-vc-unlocked-changes-face)

(defface neo-vc-added-face
  '((((background dark)) (:foreground "LightGreen"))
    (t                   (:foreground "DarkGreen")))
  "*Face used for vc-added files in the neotree buffer."
  :group 'neotree-vc :group 'font-lock-highlighting-faces)
(defvar  neo-vc-added-face 'neo-vc-added-face)

(defface neo-vc-removed-face
  '((t                    (:strike-through t)))
  "*Face used for vc-removed files in the neotree buffer."
  :group 'neotree-vc :group 'font-lock-highlighting-faces)
(defvar  neo-vc-removed-face 'neo-vc-removed-face)

(defface neo-vc-conflict-face
  '((((background dark)) (:foreground "Red1"))
    (t                   (:foreground "Red3")))
  "*Face used for vc-conflict files in the neotree buffer."
  :group 'neotree-vc :group 'font-lock-highlighting-faces)
(defvar  neo-vc-conflict-face 'neo-vc-conflict-face)

(defface neo-vc-missing-face
  '((((background dark)) (:foreground "Red1"))
    (t                   (:foreground "Red3")))
  "*Face used for vc-missing files in the neotree buffer."
  :group 'neotree-vc :group 'font-lock-highlighting-faces)
(defvar  neo-vc-missing-face 'neo-vc-missing-face)

(defface neo-vc-ignored-face
  '((((background dark)) (:foreground "DarkGrey"))
    (t                   (:foreground "LightGray")))
  "*Face used for vc-ignored files in the neotree buffer."
  :group 'neotree-vc :group 'font-lock-highlighting-faces)
(defvar  neo-vc-ignored-face 'neo-vc-ignored-face)

(defface neo-vc-unregistered-face
  nil
  "*Face used for vc-unregistered files in the neotree buffer."
  :group 'neotree-vc :group 'font-lock-highlighting-faces)
(defvar  neo-vc-unregistered-face 'neo-vc-unregistered-face)

;;
;; Variables
;;

(defvar neo-global--buffer nil)

(defvar neo-global--window nil)

(defvar neo-global--autorefresh-timer nil)

(defvar neo-mode-line-format
  (list
   '(:eval
     (let* ((fname (neo-buffer--get-filename-current-line))
            (current (if fname fname neo-buffer--start-node))
            (parent (if fname (file-name-directory current) current))
            (nodes (neo-buffer--get-nodes parent))
            (dirs (car nodes))
            (files (cdr nodes))
            (ndirs (length dirs))
            (nfiles (length files))
            (index
             (when fname
               (1+ (if (file-directory-p current)
                       (neo-buffer--get-node-index current dirs)
                     (+ ndirs (neo-buffer--get-node-index current files)))))))
       (neo-mode-line--compute-format parent index ndirs nfiles))))
  "Neotree mode-line displaying information on the current node.
This mode-line format is used if `neo-mode-line-type' is set to `neotree'")

(defvar-local neo-buffer--start-node nil
  "Start node(i.e. directory) for the window.")

(defvar-local neo-buffer--start-line nil
  "Index of the start line of the root.")

(defvar-local neo-buffer--cursor-pos (cons nil 1)
  "To save the cursor position.
The car of the pair will store fullpath, and cdr will store line number.")

(defvar-local neo-buffer--last-window-pos (cons nil 1)
  "To save the scroll position for NeoTree window.")

(defvar-local neo-buffer--show-hidden-file-p nil
  "Show hidden nodes in tree.")

(defvar-local neo-buffer--expanded-node-list nil
  "A list of expanded dir nodes.")

(defvar-local neo-buffer--node-list nil
  "The model of current NeoTree buffer.")

(defvar-local neo-buffer--node-list-1 nil
  "The model of current NeoTree buffer (temp).")

;;
;; Major mode definitions
;;

(defvar neotree-file-button-keymap
  (let ((map (make-sparse-keymap)))
    (define-key map [mouse-2]
      (neotree-make-executor
       :file-fn 'neo-open-file))
    map)
  "Keymap for file-node button.")

(defvar neotree-dir-button-keymap
  (let ((map (make-sparse-keymap)))
    (define-key map [mouse-2]
      (neotree-make-executor :dir-fn  'neo-open-dir))
    map)
  "Keymap for dir-node button.")

(defvar neotree-mode-map
  (let ((map (make-sparse-keymap)))
    (define-key map (kbd "TAB")     (neotree-make-executor
                                     :dir-fn  'neo-open-dir))
    (define-key map (kbd "RET")     (neotree-make-executor
                                     :file-fn 'neo-open-file
                                     :dir-fn  'neo-open-dir))
    (define-key map (kbd "|")       (neotree-make-executor
                                     :file-fn 'neo-open-file-vertical-split))
    (define-key map (kbd "-")       (neotree-make-executor
                                     :file-fn 'neo-open-file-horizontal-split))
    (define-key map (kbd "a")       (neotree-make-executor
                                     :file-fn 'neo-open-file-ace-window))
    (define-key map (kbd "d")       (neotree-make-executor
                                     :dir-fn 'neo-open-dired))
    (define-key map (kbd "SPC")     'neotree-quick-look)
    (define-key map (kbd "g")       'neotree-refresh)
    (define-key map (kbd "q")       'neotree-hide)
    (define-key map (kbd "p")       'neotree-previous-line)
    (define-key map (kbd "C-p")     'neotree-previous-line)
    (define-key map (kbd "n")       'neotree-next-line)
    (define-key map (kbd "C-n")     'neotree-next-line)
    (define-key map (kbd "A")       'neotree-stretch-toggle)
    (define-key map (kbd "U")       'neotree-select-up-node)
    (define-key map (kbd "D")       'neotree-select-down-node)
    (define-key map (kbd "H")       'neotree-hidden-file-toggle)
    (define-key map (kbd "S")       'neotree-select-previous-sibling-node)
    (define-key map (kbd "s")       'neotree-select-next-sibling-node)
    (define-key map (kbd "o")       'neotree-open-file-in-system-application)
    (define-key map (kbd "C-x C-f") 'find-file-other-window)
    (define-key map (kbd "C-x 1")   'neotree-empty-fn)
    (define-key map (kbd "C-x 2")   'neotree-empty-fn)
    (define-key map (kbd "C-x 3")   'neotree-empty-fn)
    (define-key map (kbd "C-c C-f") 'find-file-other-window)
    (define-key map (kbd "C-c C-c") 'neotree-change-root)
    (define-key map (kbd "C-c c")   'neotree-dir)
    (cond
     ((eq neo-keymap-style 'default)
      (define-key map (kbd "C-c C-n") 'neotree-create-node)
      (define-key map (kbd "C-c C-d") 'neotree-delete-node)
      (define-key map (kbd "C-c C-r") 'neotree-rename-node)
      (define-key map (kbd "C-c C-p") 'neotree-copy-node))
     ((eq neo-keymap-style 'concise)
      (define-key map (kbd "C") 'neotree-change-root)
      (define-key map (kbd "c") 'neotree-create-node)
      (define-key map (kbd "+") 'neotree-create-node)
      (define-key map (kbd "d") 'neotree-delete-node)
      (define-key map (kbd "r") 'neotree-rename-node)
      (define-key map (kbd "e") 'neotree-enter)))
    map)
  "Keymap for `neotree-mode'.")

(define-derived-mode neotree-mode special-mode "NeoTree"
  "A major mode for displaying the directory tree in text mode."
  (setq indent-tabs-mode nil            ; only spaces
        buffer-read-only t              ; read only
        truncate-lines -1
        neo-buffer--show-hidden-file-p neo-show-hidden-files)
  (pcase neo-mode-line-type
    (`neotree
     (setq-local mode-line-format neo-mode-line-format)
     (add-hook 'post-command-hook 'force-mode-line-update nil t))
    (`none (setq-local mode-line-format nil))
    (`custom
     (setq-local mode-line-format neo-mode-line-custom-format)
     (add-hook 'post-command-hook 'force-mode-line-update nil t))
    (_ nil))
  ;; fix for electric-indent-mode
  ;; for emacs 24.4
  (if (fboundp 'electric-indent-local-mode)
      (electric-indent-local-mode -1)
    ;; for emacs 24.3 or less
    (add-hook 'electric-indent-functions
              (lambda (arg) 'no-indent) nil 'local))
  (when neo-auto-indent-point
    (add-hook 'post-command-hook 'neo-hook--node-first-letter nil t)))

;;
;; Global methods
;;

(defun neo-global--window-exists-p ()
  "Return non-nil if neotree window exists."
  (and (not (null (window-buffer neo-global--window)))
       (eql (window-buffer neo-global--window) (neo-global--get-buffer))))

(defun neo-global--select-window ()
  "Select the NeoTree window."
  (interactive)
  (let ((window (neo-global--get-window t)))
    (select-window window)))

(defun neo-global--get-window (&optional auto-create-p)
  "Return the neotree window if it exists, else return nil.
But when the neotree window does not exist and AUTO-CREATE-P is non-nil,
it will create the neotree window and return it."
  (unless (neo-global--window-exists-p)
    (setf neo-global--window nil))
  (when (and (null neo-global--window)
             auto-create-p)
    (setq neo-global--window
          (neo-global--create-window)))
  neo-global--window)

(defun neo-default-display-fn (buffer _alist)
  "Display BUFFER to the left or right of the root window.
The side is decided according to `neo-window-position'.
The root window is the root window of the selected frame.
_ALIST is ignored."
  (let ((window-pos (if (eq neo-window-position 'left) 'left 'right)))
    (display-buffer-in-side-window buffer `((side . ,window-pos)))))

(defun neo-global--create-window ()
  "Create global neotree window."
  (let ((window nil)
        (buffer (neo-global--get-buffer t)))
    (setq window
          (select-window
           (display-buffer buffer neo-display-action)))
    (neo-window--init window buffer)
    (neo-global--attach)
    (neo-global--reset-width)
    window))

(defun neo-global--get-buffer (&optional init-p)
  "Return the global neotree buffer if it exists.
If INIT-P is non-nil and global NeoTree buffer not exists, then create it."
  (unless (equal (buffer-name neo-global--buffer)
                 neo-buffer-name)
    (setf neo-global--buffer nil))
  (when (and init-p
             (null neo-global--buffer))
    (save-window-excursion
      (setq neo-global--buffer
            (neo-buffer--create))))
  neo-global--buffer)

(defun neo-global--file-in-root-p (path)
  "Return non-nil if PATH in root dir."
  (neo-global--with-buffer
    (and (not (null neo-buffer--start-node))
         (neo-path--file-in-directory-p path neo-buffer--start-node))))

(defun neo-global--alone-p ()
  "Check whether the global neotree window is alone with some other window."
  (let ((windows (window-list)))
    (and (= (length windows)
            2)
         (member neo-global--window windows))))

(defun neo-global--do-autorefresh ()
  "Do auto refresh."
  (interactive)
  (when (and neo-autorefresh (neo-global--window-exists-p))
    (neotree-refresh t)))

(defun neo-global--open ()
  "Show the NeoTree window."
  (let ((valid-start-node-p nil))
    (neo-global--with-buffer
      (setf valid-start-node-p (neo-buffer--valid-start-node-p)))
    (if (not valid-start-node-p)
        (neo-global--open-dir (neo-path--get-working-dir))
      (neo-global--get-window t))))

(defun neo-global--open-dir (path)
  "Show the NeoTree window, and change root to PATH."
  (neo-global--get-window t)
  (neo-global--with-buffer
    (neo-buffer--change-root path)))

(defun neo-global--open-and-find (path)
  "Quick select node which specified PATH in NeoTree."
  (let ((npath path)
        root-dir)
    (when (null npath)
      (throw 'invalid-path "Invalid path to select."))
    (setq root-dir (if (file-directory-p npath)
                       npath (neo-path--updir npath)))
    (when (or (not (neo-global--window-exists-p))
              (not (neo-global--file-in-root-p npath)))
      (neo-global--open-dir root-dir))
    (neo-global--with-window
      (neo-buffer--select-file-node npath t))))

(defun neo-global--select-mru-window (arg)
  "Create or find a window to select when open a file node.
The description of ARG is in `neotree-enter'."
  (when (eq (safe-length (window-list)) 1)
    (neo-buffer--with-resizable-window
     (split-window-horizontally)))
  (neo-global--when-window
    (neo-window--zoom 'minimize))
  ;; select target window
  (cond
   ;; select window with winum
   ((and (integerp arg)
         (bound-and-true-p winum-mode)
         (fboundp 'winum-select-window-by-number))
    (winum-select-window-by-number arg))
   ;; select window with window numbering
   ((and (integerp arg)
         (boundp 'window-numbering-mode)
         (symbol-value window-numbering-mode)
         (fboundp 'select-window-by-number))
    (select-window-by-number arg))
   ;; open node in a new vertically split window
   ((and (stringp arg) (string= arg "a")
         (fboundp 'ace-select-window))
    (ace-select-window))
   ((and (stringp arg) (string= arg "|"))
    (select-window (get-mru-window))
    (split-window-right)
    (windmove-right))
   ;; open node in a new horizontally split window
   ((and (stringp arg) (string= arg "-"))
    (select-window (get-mru-window))
    (split-window-below)
    (windmove-down)))
  ;; open node in last active window
  (select-window (get-mru-window)))

(defun neo-global--detach ()
  "Detach the global neotree buffer."
  (when neo-global--autorefresh-timer
    (cancel-timer neo-global--autorefresh-timer))
  (neo-global--with-buffer
    (neo-buffer--unlock-width))
  (setq neo-global--buffer nil)
  (setq neo-global--window nil))

(defun neo-global--attach ()
  "Attach the global neotree buffer"
  (when neo-global--autorefresh-timer
    (cancel-timer neo-global--autorefresh-timer))
  (when neo-autorefresh
    (setq neo-global--autorefresh-timer
          (run-with-idle-timer 2 10 'neo-global--do-autorefresh)))
  (setq neo-global--buffer (get-buffer neo-buffer-name))
  (setq neo-global--window (get-buffer-window
                            neo-global--buffer))
  (neo-global--with-buffer
    (neo-buffer--lock-width))
  (run-hook-with-args 'neo-after-create-hook '(window)))

(defun neo-global--set-window-width (width)
  "Set neotree window width to WIDTH."
  (neo-global--with-window
    (neo-buffer--with-resizable-window
     (neo-util--set-window-width (selected-window) width))))

(defun neo-global--reset-width ()
  "Set neotree window width to `neo-window-width'."
  (neo-global--set-window-width neo-window-width))

;;
;; Advices
;;

(defadvice mouse-drag-vertical-line
    (around neotree-drag-vertical-line (start-event) activate)
  "Drag and drop is not affected by the lock."
  (neo-buffer--with-resizable-window
   ad-do-it))

(defadvice balance-windows
    (around neotree-balance-windows activate)
  "Fix neotree inhibits balance-windows."
  (if (neo-global--window-exists-p)
      (let (old-width)
        (neo-global--with-window
          (setq old-width (window-width)))
        (neo-buffer--with-resizable-window
         ad-do-it)
        (neo-global--with-window
          (neo-global--set-window-width old-width)))
    ad-do-it))

(eval-after-load 'popwin
  '(progn
     (defadvice popwin:create-popup-window
         (around neotree/popwin-popup-buffer activate)
       (let ((neo-exists-p (neo-global--window-exists-p)))
         (when neo-exists-p
           (neo-global--detach))
         ad-do-it
         (when neo-exists-p
           (neo-global--attach)
           (neo-global--reset-width))))

     (defadvice popwin:close-popup-window
         (around neotree/popwin-close-popup-window activate)
       (let ((neo-exists-p (neo-global--window-exists-p)))
         (when neo-exists-p
           (neo-global--detach))
         ad-do-it
         (when neo-exists-p
           (neo-global--attach)
           (neo-global--reset-width))))))

;;
;; Hooks
;;

(defun neo-hook--node-first-letter ()
  "Move point to the first letter of the current node."
  (when (or (eq this-command 'next-line)
            (eq this-command 'previous-line))
    (neo-point-auto-indent)))

;;
;; Util methods
;;

(defun neo-util--filter (condp lst)
  "Apply CONDP to elements of LST keeping those that return non-nil.

Example:
    (neo-util--filter 'symbolp '(a \"b\" 3 d4))
         => (a d4)

This procedure does not work when CONDP is the `null' function."
  (delq nil
        (mapcar (lambda (x) (and (funcall condp x) x)) lst)))

(defun neo-util--find (where which)
  "Find element of the list WHERE matching predicate WHICH."
  (catch 'found
    (dolist (elt where)
      (when (funcall which elt)
        (throw 'found elt)))
    nil))

(defun neo-util--make-printable-string (string)
  "Strip newline character from STRING, like 'Icon\n'."
  (replace-regexp-in-string "\n" "" string))

(defun neo-util--walk-dir (path)
  "Return the subdirectories and subfiles of the PATH."
  (let* ((full-path (neo-path--file-truename path)))
    (condition-case nil
        (directory-files
         path 'full directory-files-no-dot-files-regexp)
      ('file-error
       (message "Walk directory %S failed." path)
       nil))))

(defun neo-util--hidden-path-filter (node)
  "A filter function, if the NODE can not match each item in \
`neo-hidden-regexp-list', return t."
  (if (not neo-buffer--show-hidden-file-p)
      (let ((shortname (neo-path--file-short-name node)))
        (null (neo-util--filter
               (lambda (x) (not (null (string-match-p x shortname))))
               neo-hidden-regexp-list)))
    node))

(defun neo-str--trim-left (s)
  "Remove whitespace at the beginning of S."
  (if (string-match "\\`[ \t\n\r]+" s)
      (replace-match "" t t s)
    s))

(defun neo-str--trim-right (s)
  "Remove whitespace at the end of S."
  (if (string-match "[ \t\n\r]+\\'" s)
      (replace-match "" t t s)
    s))

(defun neo-str--trim (s)
  "Remove whitespace at the beginning and end of S."
  (neo-str--trim-left (neo-str--trim-right s)))

(defun neo-path--expand-name (path &optional current-dir)
  (expand-file-name (or (if (file-name-absolute-p path) path)
			(let ((r-path path))
			  (setq r-path (substitute-in-file-name r-path))
			  (setq r-path (expand-file-name r-path current-dir))
			  r-path))))

(defun neo-path--shorten (path len)
  "Shorten a given PATH to a specified LEN.
This is needed for paths, which are to long for the window to display
completely.  The function cuts of the first part of the path to remain
the last folder (the current one)."
  (let ((result
         (if (> (length path) len)
             (concat "<" (substring path (- (- len 2))))
           path)))
    (when result
      (decode-coding-string result 'utf-8))))

(defun neo-path--insert-chroot-button (label path face)
  (insert-button
   label
   'action '(lambda (x) (neotree-change-root))
   'follow-link t
   'face face
   'neo-full-path path))

(defun neo-path--insert-header-buttonized (path)
  "Shortens the PATH to (window-body-width) and displays any \
visible remains as buttons that, when clicked, navigate to that
parent directory."
  (let* ((dirs (reverse (cl-maplist 'identity (reverse (split-string path "/" :omitnulls)))))
         (last (car-safe (car-safe (last dirs)))))
    (neo-path--insert-chroot-button "/" "/" 'neo-root-dir-face)
    (dolist (dir dirs)
      (if (string= (car dir) last)
          (neo-buffer--insert-with-face last 'neo-root-dir-face)
        (neo-path--insert-chroot-button
         (concat (car dir) "/")
         (apply 'neo-path--join (cons "/" (reverse dir)))
         'neo-root-dir-face))))
  ;;shorten the line if need be
  (when (> (current-column) (window-body-width))
    (forward-char (- (window-body-width)))
    (delete-region (point-at-bol) (point))
    (let* ((button (button-at (point)))
           (path (if button (overlay-get button 'neo-full-path) "/")))
      (neo-path--insert-chroot-button "<" path 'neo-root-dir-face))
    (end-of-line)))

(defun neo-path--updir (path)
  (let ((r-path (neo-path--expand-name path)))
    (if (and (> (length r-path) 0)
             (equal (substring r-path -1) "/"))
        (setq r-path (substring r-path 0 -1)))
    (if (eq (length r-path) 0)
        (setq r-path "/"))
    (directory-file-name
     (file-name-directory r-path))))

(defun neo-path--join (root &rest dirs)
  "Joins a series of directories together with ROOT and DIRS.
Like Python's os.path.join,
  (neo-path--join \"/tmp\" \"a\" \"b\" \"c\") => /tmp/a/b/c ."
  (or (if (not dirs) root)
      (let ((tdir (car dirs))
            (epath nil))
        (setq epath
              (or (if (equal tdir ".") root)
                  (if (equal tdir "..") (neo-path--updir root))
                  (neo-path--expand-name tdir root)))
        (apply 'neo-path--join
               epath
               (cdr dirs)))))

(defun neo-path--file-short-name (file)
  "Base file/directory name by FILE.
Taken from http://lists.gnu.org/archive/html/emacs-devel/2011-01/msg01238.html"
  (or (if (string= file "/") "/")
      (neo-util--make-printable-string (file-name-nondirectory (directory-file-name file)))))

(defun neo-path--file-truename (path)
  (let ((rlt (file-truename path)))
    (if (not (null rlt))
        (progn
          (if (and (file-directory-p rlt)
                   (> (length rlt) 0)
                   (not (equal (substring rlt -1) "/")))
              (setq rlt (concat rlt "/")))
          rlt)
      nil)))

(defun neo-path--has-subfile-p (dir)
  "To determine whether a directory(DIR) contain files."
  (and (file-exists-p dir)
       (file-directory-p dir)
       (neo-util--walk-dir dir)
       t))

(defun neo-path--match-path-directory (path)
  (let ((true-path (neo-path--file-truename path))
        (rlt-path nil))
    (setq rlt-path
          (catch 'rlt
            (if (file-directory-p true-path)
                (throw 'rlt true-path))
            (setq true-path
                  (file-name-directory true-path))
            (if (file-directory-p true-path)
                (throw 'rlt true-path))))
    (if (not (null rlt-path))
        (setq rlt-path (neo-path--join "." rlt-path "./")))
    rlt-path))

(defun neo-path--get-working-dir ()
  "Return a directory name of the current buffer."
  (file-name-as-directory (file-truename default-directory)))

(defun neo-path--strip (path)
  "Remove whitespace at the end of PATH."
  (let* ((rlt (neo-str--trim path))
         (pos (string-match "[\\\\/]+\\'" rlt)))
    (when pos
      (setq rlt (replace-match "" t t rlt))
      (when (eq (length rlt) 0)
        (setq rlt "/")))
    rlt))

(defun neo-path--path-equal-p (path1 path2)
  "Return non-nil if pathes PATH1 and PATH2 are the same path."
  (string-equal (neo-path--strip path1)
                (neo-path--strip path2)))

(defun neo-path--file-equal-p (file1 file2)
  "Return non-nil if files FILE1 and FILE2 name the same file.
If FILE1 or FILE2 does not exist, the return value is unspecified."
  (unless (or (null file1)
              (null file2))
    (let ((nfile1 (neo-path--strip file1))
          (nfile2 (neo-path--strip file2)))
      (file-equal-p nfile1 nfile2))))

(defun neo-path--file-in-directory-p (file dir)
  "Return non-nil if FILE is in DIR or a subdirectory of DIR.
A directory is considered to be \"in\" itself.
Return nil if DIR is not an existing directory."
  (let ((nfile (neo-path--strip file))
        (ndir (neo-path--strip dir)))
    (setq ndir (concat ndir "/"))
    (file-in-directory-p nfile ndir)))

(defun neo-util--kill-buffers-for-path (path)
  "Kill all buffers for files in PATH."
  (let ((buffer (find-buffer-visiting path)))
    (when buffer
      (kill-buffer buffer)))
  (dolist (filename (directory-files path t directory-files-no-dot-files-regexp))
    (let ((buffer (find-buffer-visiting filename)))
      (when buffer
        (kill-buffer buffer))
      (when (and
             (file-directory-p filename)
             (neo-path--has-subfile-p filename))
        (neo-util--kill-buffers-for-path filename)))))

(defun neo-util--set-window-width (window n)
  "Make WINDOW N columns width."
  (let ((w (max n window-min-width)))
    (unless (null window)
      (if (> (window-width) w)
          (shrink-window-horizontally (- (window-width) w))
        (if (< (window-width) w)
            (enlarge-window-horizontally (- w (window-width))))))))

(defun neo-point-auto-indent ()
  "Put the point on the first letter of the current node."
  (when (neo-buffer--get-filename-current-line)
    (beginning-of-line 1)
    (re-search-forward "[^-\s+]" (line-end-position 1) t)
    (backward-char 1)))

(defun off-p (msg)
  "Returns true regardless of message value in the argument."
  t)

(defun neo-sort-hidden-last (x y)
  "Sort normally but with hidden files last."
  (let ((x-hidden (neo-filepath-hidden-p x))
        (y-hidden (neo-filepath-hidden-p y)))
    (cond
     ((and x-hidden (not y-hidden))
      nil)
     ((and (not x-hidden) y-hidden)
      t)
     (t
      (string< x y)))))

(defun neo-filepath-hidden-p (node)
  "Return whether or not node is a hidden path."
  (let ((shortname (neo-path--file-short-name node)))
    (neo-util--filter
     (lambda (x) (not (null (string-match-p x shortname))))
     neo-hidden-regexp-list)))

(defun neo-get-unsaved-buffers-from-projectile ()
  "Return list of unsaved buffers from projectile buffers."
  (interactive)
  (let ((rlist '())
        (rtag t))
    (condition-case nil
        (projectile-project-buffers)
      (error (setq rtag nil)))
    (when (and rtag (fboundp 'projectile-project-buffers))
      (dolist (buf (projectile-project-buffers))
        (with-current-buffer buf
          (if (and (buffer-modified-p) buffer-file-name)
              (setq rlist (cons (buffer-file-name) rlist))
            ))))
    rlist))

;;
;; Buffer methods
;;

(defun neo-buffer--newline-and-begin ()
  "Insert new line."
  (newline)
  (beginning-of-line))

(defun neo-buffer--get-icon (name)
  "Get image by NAME."
  (let ((icon-path (neo-path--join neo-dir "icons"))
        image)
    (setq image (create-image
                 (neo-path--join icon-path (concat name ".xpm"))
                 'xpm nil :ascent 'center :mask '(heuristic t)))
    image))

(defun neo-buffer--insert-fold-symbol (name &optional node-name)
  "Write icon by NAME, the icon style affected by neo-theme.
`open' write opened folder icon.
`close' write closed folder icon.
`leaf' write leaf icon.
Optional NODE-NAME is used for the `icons' theme"
  (let ((n-insert-image (lambda (n)
                          (insert-image (neo-buffer--get-icon n))))
        (n-insert-symbol (lambda (n)
                           (neo-buffer--insert-with-face
                            n 'neo-expand-btn-face))))
    (cond
     ((and (display-graphic-p) (equal neo-theme 'classic))
      (or (and (equal name 'open)  (funcall n-insert-image "open"))
          (and (equal name 'close) (funcall n-insert-image "close"))
          (and (equal name 'leaf)  (funcall n-insert-image "leaf"))))
     ((equal neo-theme 'arrow)
      (or (and (equal name 'open)  (funcall n-insert-symbol "▾"))
          (and (equal name 'close) (funcall n-insert-symbol "▸"))))
     ((equal neo-theme 'nerd)
      (or (and (equal name 'open)  (funcall n-insert-symbol "▾ "))
          (and (equal name 'close) (funcall n-insert-symbol "▸ "))
          (and (equal name 'leaf)  (funcall n-insert-symbol "  "))))
     ((and (display-graphic-p) (equal neo-theme 'icons))
      (unless (require 'all-the-icons nil 'noerror)
        (error "Package `all-the-icons' isn't installed"))
      (setq-local tab-width 1)
      (or (and (equal name 'open)  (insert (all-the-icons-icon-for-dir node-name "down")))
          (and (equal name 'close) (insert (all-the-icons-icon-for-dir node-name "right")))
          (and (equal name 'leaf)  (insert (format "\t\t\t%s\t" (all-the-icons-icon-for-file node-name))))))
     (t
      (or (and (equal name 'open)  (funcall n-insert-symbol "- "))
          (and (equal name 'close) (funcall n-insert-symbol "+ ")))))))

(defun neo-buffer--save-cursor-pos (&optional node-path line-pos)
  "Save cursor position.
If NODE-PATH and LINE-POS is nil, it will be save the current line node position."
  (let ((cur-node-path nil)
        (cur-line-pos nil)
        (ws-wind (selected-window))
        (ws-pos (window-start)))
    (setq cur-node-path (if node-path
                            node-path
                          (neo-buffer--get-filename-current-line)))
    (setq cur-line-pos (if line-pos
                           line-pos
                         (line-number-at-pos)))
    (setq neo-buffer--cursor-pos (cons cur-node-path cur-line-pos))
    (setq neo-buffer--last-window-pos (cons ws-wind ws-pos))))

(defun neo-buffer--goto-cursor-pos ()
  "Jump to saved cursor position."
  (let ((line-pos nil)
        (node (car neo-buffer--cursor-pos))
        (line-pos (cdr neo-buffer--cursor-pos))
        (ws-wind (car neo-buffer--last-window-pos))
        (ws-pos (cdr neo-buffer--last-window-pos)))
    (catch 'line-pos-founded
      (unless (null node)
        (setq line-pos 0)
        (mapc
         (lambda (x)
           (setq line-pos (1+ line-pos))
           (unless (null x)
             (when (neo-path--path-equal-p x node)
               (throw 'line-pos-founded line-pos))))
         neo-buffer--node-list))
      (setq line-pos (cdr neo-buffer--cursor-pos))
      (throw 'line-pos-founded line-pos))
    ;; goto line
    (goto-char (point-min))
    (neo-buffer--forward-line (1- line-pos))
    ;; scroll window
    (when (equal (selected-window) ws-wind)
      (set-window-start ws-wind ws-pos t))))

(defun neo-buffer--node-list-clear ()
  "Clear node list."
  (setq neo-buffer--node-list nil))

(defun neo-buffer--node-list-set (line-num path)
  "Set value in node list.
LINE-NUM is the index of node list.
PATH is value."
  (let ((node-list-length (length neo-buffer--node-list))
        (node-index line-num))
    (when (null node-index)
      (setq node-index (line-number-at-pos)))
    (when (< node-list-length node-index)
      (setq neo-buffer--node-list
            (vconcat neo-buffer--node-list
                     (make-vector (- node-index node-list-length) nil))))
    (aset neo-buffer--node-list (1- node-index) path))
  neo-buffer--node-list)

(defun neo-buffer--insert-with-face (content face)
  (let ((pos-start (point)))
    (insert content)
    (set-text-properties pos-start
                         (point)
                         (list 'face face))))

(defun neo-buffer--valid-start-node-p ()
  (and (not (null neo-buffer--start-node))
       (file-accessible-directory-p neo-buffer--start-node)))

(defun neo-buffer--create ()
  "Create and switch to NeoTree buffer."
  (switch-to-buffer
   (generate-new-buffer-name neo-buffer-name))
  (neotree-mode)
  ;; disable linum-mode
  (when (and (boundp 'linum-mode)
             (not (null linum-mode)))
    (linum-mode -1))
  (current-buffer))

(defun neo-buffer--insert-banner ()
  (unless (null neo-banner-message)
    (let ((start (point)))
      (insert neo-banner-message)
      (set-text-properties start (point) '(face neo-banner-face)))
    (neo-buffer--newline-and-begin)))

(defun neo-buffer--insert-root-entry (node)
  (when neo-show-updir-line
    (insert-button ".."
                   'action '(lambda (x) (neotree-change-root))
                   'follow-link t
                   'face neo-file-link-face
                   'neo-full-path (neo-path--updir node))
    (let ((start (point)))
      (insert " (up a dir)")
      (set-text-properties start (point) '(face neo-header-face)))
    (neo-buffer--newline-and-begin))
  (neo-buffer--node-list-set nil node)
  (cond
   ((eq neo-cwd-line-style 'button)
    (neo-path--insert-header-buttonized node))
   (t
    (neo-buffer--insert-with-face (neo-path--shorten node (window-body-width))
                                  'neo-root-dir-face)))
  (neo-buffer--newline-and-begin))

(defun neo-buffer--help-echo-message (node-name)
  (cond
   ((eq neo-help-echo-style 'default)
    (if (<= (+ (current-column) (string-width node-name))
            neo-window-width)
        nil
      node-name))
   (t nil)))

(defun neo-buffer--insert-dir-entry (node depth expanded)
  (let ((node-short-name (neo-path--file-short-name node)))
    (insert-char ?\s (* (- depth 1) 2)) ; indent
    (when (memq 'char neo-vc-integration)
      (insert-char ?\s 2))
    (neo-buffer--insert-fold-symbol
     (if expanded 'open 'close) node)
    (insert-button (concat node-short-name "/")
                   'follow-link t
                   'face neo-dir-link-face
                   'neo-full-path node
                   'keymap neotree-dir-button-keymap
                   'help-echo (neo-buffer--help-echo-message node-short-name))
    (neo-buffer--node-list-set nil node)
    (neo-buffer--newline-and-begin)))

(defun neo-buffer--insert-file-entry (node depth)
  (let ((node-short-name (neo-path--file-short-name node))
        (vc (when neo-vc-integration (neo-vc-for-node node))))
    (insert-char ?\s (* (- depth 1) 2)) ; indent
    (when (memq 'char neo-vc-integration)
      (insert-char (car vc))
      (insert-char ?\s))
    (neo-buffer--insert-fold-symbol 'leaf node-short-name)
    (insert-button node-short-name
                   'follow-link t
                   'face (if (memq 'face neo-vc-integration)
                             (cdr vc)
                           neo-file-link-face)
                   'neo-full-path node
                   'keymap neotree-file-button-keymap
                   'help-echo (neo-buffer--help-echo-message node-short-name))
    (neo-buffer--node-list-set nil node)
    (neo-buffer--newline-and-begin)))

(defun neo-vc-for-node (node)
  (let* ((backend (ignore-errors
                    (vc-responsible-backend node)))
         (vc-state (when backend (vc-state node backend))))
    (cons (cdr (assoc vc-state neo-vc-state-char-alist))
          (cl-case vc-state
            (up-to-date       neo-vc-up-to-date-face)
            (edited           neo-vc-edited-face)
            (needs-update     neo-vc-needs-update-face)
            (needs-merge      neo-vc-needs-merge-face)
            (unlocked-changes neo-vc-unlocked-changes-face)
            (added            neo-vc-added-face)
            (removed          neo-vc-removed-face)
            (conflict         neo-vc-conflict-face)
            (missing          neo-vc-missing-face)
            (ignored          neo-vc-ignored-face)
            (unregistered     neo-vc-unregistered-face)
            (user             neo-vc-user-face)
            (otherwise        neo-vc-default-face)))))

(defun neo-buffer--get-nodes (path)
  (let* ((nodes (neo-util--walk-dir path))
         (comp neo-filepath-sort-function)
         (nodes (neo-util--filter 'neo-util--hidden-path-filter nodes)))
    (cons (sort (neo-util--filter 'file-directory-p nodes) comp)
          (sort (neo-util--filter #'(lambda (f) (not (file-directory-p f))) nodes) comp))))

(defun neo-buffer--get-node-index (node nodes)
  "Return the index of NODE in NODES.

NODES can be a list of directory or files.
Return nil if NODE has not been found in NODES."
  (let ((i 0)
        (l (length nodes))
        (cur (car nodes))
        (rest (cdr nodes)))
    (while (and cur (not (equal cur node)))
      (setq i (1+ i))
      (setq cur (car rest))
      (setq rest (cdr rest)))
    (if (< i l) i)))

(defun neo-buffer--expanded-node-p (node)
  "Return non-nil if NODE is expanded."
  (neo-util--to-bool
   (neo-util--find
    neo-buffer--expanded-node-list
    #'(lambda (x) (equal x node)))))

(defun neo-buffer--set-expand (node do-expand)
  "Set the expanded state of the NODE to DO-EXPAND.
Return the new expand state for NODE (t for expanded, nil for collapsed)."
  (if (not do-expand)
      (setq neo-buffer--expanded-node-list
            (neo-util--filter
             #'(lambda (x) (not (equal node x)))
             neo-buffer--expanded-node-list))
    (push node neo-buffer--expanded-node-list))
  do-expand)

(defun neo-buffer--toggle-expand (node)
  (neo-buffer--set-expand node (not (neo-buffer--expanded-node-p node))))

(defun neo-buffer--insert-tree (path depth)
  (if (eq depth 1)
      (neo-buffer--insert-root-entry path))
  (let* ((contents (neo-buffer--get-nodes path))
         (nodes (car contents))
         (leafs (cdr contents))
         (default-directory path))
    (dolist (node nodes)
      (let ((expanded (neo-buffer--expanded-node-p node)))
        (neo-buffer--insert-dir-entry
         node depth expanded)
        (if expanded (neo-buffer--insert-tree (concat node "/") (+ depth 1)))))
    (dolist (leaf leafs)
      (neo-buffer--insert-file-entry leaf depth))))

(defun neo-buffer--refresh (save-pos-p &optional non-neotree-buffer)
  "Refresh the NeoTree buffer.
If SAVE-POS-P is non-nil, it will be auto save current line number."
  (let ((start-node neo-buffer--start-node))
    (unless start-node
      (setq start-node default-directory))
    (neo-buffer--with-editing-buffer
     ;; save context
     (when save-pos-p
       (neo-buffer--save-cursor-pos))
     (when non-neotree-buffer
       (setq neo-buffer--start-node start-node))
     ;; starting refresh
     (erase-buffer)
     (neo-buffer--node-list-clear)
     (neo-buffer--insert-banner)
     (setq neo-buffer--start-line neo-header-height)
     (neo-buffer--insert-tree start-node 1))
    ;; restore context
    (neo-buffer--goto-cursor-pos)))

(defun neo-buffer--post-move ()
  "Reset current directory when position moved."
  (funcall
   (neotree-make-executor
    :file-fn
    '(lambda (path _)
       (setq default-directory (neo-path--updir btn-full-path)))
    :dir-fn
    '(lambda (path _)
       (setq default-directory path)))))

(defun neo-buffer--get-button-current-line ()
  "Return the first button in current line."
  (let* ((btn-position nil)
         (pos-line-start (line-beginning-position))
         (pos-line-end (line-end-position))
         ;; NOTE: cannot find button when the button
         ;;       at beginning of the line
         (current-button (or (button-at (point))
                             (button-at pos-line-start))))
    (if (null current-button)
        (progn
          (setf btn-position
                (catch 'ret-button
                  (let* ((next-button (next-button pos-line-start))
                         (pos-btn nil))
                    (if (null next-button) (throw 'ret-button nil))
                    (setf pos-btn (overlay-start next-button))
                    (if (> pos-btn pos-line-end) (throw 'ret-button nil))
                    (throw 'ret-button pos-btn))))
          (if (null btn-position)
              nil
            (setf current-button (button-at btn-position)))))
    current-button))

(defun neo-buffer--get-filename-current-line (&optional default)
  "Return filename for first button in current line.
If there is no button in current line, then return DEFAULT."
  (let ((btn (neo-buffer--get-button-current-line)))
    (if (not (null btn))
        (button-get btn 'neo-full-path)
      default)))

(defun neo-buffer--lock-width ()
  "Lock the width size for NeoTree window."
  (if neo-window-fixed-size
      (setq window-size-fixed 'width)))

(defun neo-buffer--unlock-width ()
  "Unlock the width size for NeoTree window."
  (setq window-size-fixed nil))

(defun neo-buffer--rename-node ()
  "Rename current node as another path."
  (interactive)
  (let* ((current-path (neo-buffer--get-filename-current-line))
         (buffer (find-buffer-visiting current-path))
         to-path
         msg)
    (unless (null current-path)
      (setq msg (format "Rename [%s] to: " (neo-path--file-short-name current-path)))
      (setq to-path (read-file-name msg (file-name-directory current-path)))
      (if buffer
          (with-current-buffer buffer
            (set-visited-file-name to-path nil t)))
      (rename-file current-path to-path 1)
      (neo-buffer--refresh t)
      (message "Rename successful."))))

(defun neo-buffer--copy-node ()
  "Copies current node as another path."
  (interactive)
  (let* ((current-path (neo-buffer--get-filename-current-line))
         (buffer (find-buffer-visiting current-path))
         to-path
         msg)
    (unless (null current-path)
      (setq msg (format "Copy [%s] to: " (neo-path--file-short-name current-path)))
      (setq to-path (read-file-name msg (file-name-directory current-path)))
      (if (file-directory-p current-path)
          (copy-directory current-path to-path)
        (copy-file current-path to-path))
      (neo-buffer--refresh t)
      (message "Copy successful."))))

(defun neo-buffer--select-file-node (file &optional recursive-p)
  "Select the node that corresponds to the FILE.
If RECURSIVE-P is non nil, find files will recursively."
  (let ((efile file)
        (iter-curr-dir nil)
        (file-node-find-p nil)
        (file-node-list nil))
    (unless (file-name-absolute-p efile)
      (setq efile (expand-file-name efile)))
    (setq iter-curr-dir efile)
    (catch 'return
      (while t
        (setq iter-curr-dir (neo-path--updir iter-curr-dir))
        (push iter-curr-dir file-node-list)
        (when (neo-path--file-equal-p iter-curr-dir neo-buffer--start-node)
          (setq file-node-find-p t)
          (throw 'return nil))
        (let ((niter-curr-dir (file-remote-p iter-curr-dir 'localname)))
          (unless niter-curr-dir
            (setq niter-curr-dir iter-curr-dir))
          (when (neo-path--file-equal-p niter-curr-dir "/")
            (setq file-node-find-p nil)
            (throw 'return nil)))))
    (when file-node-find-p
      (dolist (p file-node-list)
        (neo-buffer--set-expand p t))
      (neo-buffer--save-cursor-pos file)
      (neo-buffer--refresh nil))))

(defun neo-buffer--change-root (root-dir)
  "Change the tree root to ROOT-DIR."
  (let ((path root-dir)
        start-path)
    (unless (and (file-exists-p path)
                 (file-directory-p path))
      (throw 'error "The path is not a valid directory."))
    (setq start-path (expand-file-name (substitute-in-file-name path)))
    (setq neo-buffer--start-node start-path)
    (cd start-path)
    (neo-buffer--save-cursor-pos path nil)
    (neo-buffer--refresh nil)))

(defun neo-buffer--get-nodes-for-select-down-node (path)
  "Return the node list for the down dir selection."
  (if path
      (when (file-name-directory path)
        (if (neo-buffer--expanded-node-p path)
            (neo-buffer--get-nodes path)
          (neo-buffer--get-nodes (file-name-directory path))))
    (neo-buffer--get-nodes (file-name-as-directory neo-buffer--start-node))))

(defun neo-buffer--get-nodes-for-sibling (path)
  "Return the node list for the sibling selection. Return nil of no nodes can
be found.
The returned list is a directory list if path is a directory, otherwise it is
a file list."
  (when path
    (let ((nodes (neo-buffer--get-nodes (file-name-directory path))))
      (if (file-directory-p path)
          (car nodes)
        (cdr nodes)))))

(defun neo-buffer--sibling (path &optional previous)
  "Return the next sibling of node PATH.
If PREVIOUS is non-nil the previous sibling is returned."
  (let* ((nodes (neo-buffer--get-nodes-for-sibling path)))
    (when nodes
      (let ((i (neo-buffer--get-node-index path nodes))
            (l (length nodes)))
        (if i (nth (mod (+ i (if previous -1 1)) l) nodes))))))

(defun neo-buffer--execute (arg &optional file-fn dir-fn)
  "Define the behaviors for keyboard event.
ARG is the parameter for command.
If FILE-FN is non-nil, it will executed when a file node.
If DIR-FN is non-nil, it will executed when a dir node."
  (interactive "P")
  (let* ((btn-full-path (neo-buffer--get-filename-current-line))
         is-file-p
         enter-fn)
    (unless (null btn-full-path)
      (setq is-file-p (not (file-directory-p btn-full-path))
            enter-fn (if is-file-p file-fn dir-fn))
      (unless (null enter-fn)
        (funcall enter-fn btn-full-path arg)
        (run-hook-with-args
         'neo-enter-hook
         (if is-file-p 'file 'directory)
         btn-full-path
         arg)))
    btn-full-path))

(defun neo-buffer--set-show-hidden-file-p (show-p)
  "If SHOW-P is non-nil, show hidden nodes in tree."
  (setq neo-buffer--show-hidden-file-p show-p)
  (neo-buffer--refresh t))

(defun neo-buffer--forward-line (n)
  "Move N lines forward in NeoTree buffer."
  (forward-line (or n 1))
  (neo-buffer--post-move))

;;
;; Mode-line methods
;;

(defun neo-mode-line--compute-format (parent index ndirs nfiles)
  "Return a formated string to be used in the `neotree' mode-line."
  (let* ((nall (+ ndirs nfiles))
         (has-dirs (> ndirs 0))
         (has-files (> nfiles 0))
         (msg-index (when index (format "[%s/%s] " index nall)))
         (msg-ndirs (when has-dirs (format (if has-files " (D:%s" " (D:%s)") ndirs)))
         (msg-nfiles (when has-files (format (if has-dirs " F:%s)" " (F:%s)") nfiles)))
         (msg-directory (file-name-nondirectory (directory-file-name parent)))
         (msg-directory-max-length (- (window-width)
                                      (length msg-index)
                                      (length msg-ndirs)
                                      (length msg-nfiles))))
    (setq msg-directory (if (<= (length msg-directory) msg-directory-max-length)
                            msg-directory
                          (concat (substring msg-directory
                                             0 (- msg-directory-max-length 3))
                                  "...")))
    (propertize
     (decode-coding-string (concat msg-index msg-directory msg-ndirs msg-nfiles) 'utf-8)
     'help-echo (decode-coding-string parent 'utf-8))))

;;
;; Window methods
;;

(defun neo-window--init (window buffer)
  "Make WINDOW a NeoTree window.
NeoTree buffer is BUFFER."
  (neo-buffer--with-resizable-window
   (switch-to-buffer buffer)
   (set-window-dedicated-p window t))
  window)

(defun neo-window--zoom (method)
  "Zoom the NeoTree window, the METHOD should one of these options:
'maximize 'minimize 'zoom-in 'zoom-out."
  (neo-buffer--unlock-width)
  (cond
   ((eq method 'maximize)
    (maximize-window))
   ((eq method 'minimize)
    (neo-util--set-window-width (selected-window) neo-window-width))
   ((eq method 'zoom-in)
    (shrink-window-horizontally 2))
   ((eq method 'zoom-out)
    (enlarge-window-horizontally 2)))
  (neo-buffer--lock-width))

(defun neo-window--minimize-p ()
  "Return non-nil when the NeoTree window is minimize."
  (<= (window-width) neo-window-width))

;;
;; Interactive functions
;;

(defun neotree-next-line (&optional count)
  "Move next line in NeoTree buffer.
Optional COUNT argument, moves COUNT lines down."
  (interactive "p")
  (neo-buffer--forward-line (or count 1)))

(defun neotree-previous-line (&optional count)
  "Move previous line in NeoTree buffer.
Optional COUNT argument, moves COUNT lines up."
  (interactive "p")
  (neo-buffer--forward-line (- (or count 1))))

;;;###autoload
(defun neotree-find (&optional path default-path)
  "Quick select node which specified PATH in NeoTree.
If path is nil and no buffer file name, then use DEFAULT-PATH,"
  (interactive)
  (let* ((ndefault-path (if default-path default-path
                          (neo-path--get-working-dir)))
         (npath (if path path
                  (or (buffer-file-name) ndefault-path)))
         (do-open-p nil))
    (if (and (not neo-force-change-root)
             (not (neo-global--file-in-root-p npath))
             (neo-global--window-exists-p))
        (setq do-open-p (funcall neo-confirm-change-root "File not found in root path, do you want to change root?"))
      (setq do-open-p t))
    (when do-open-p
      (neo-global--open-and-find npath))
    (when neo-auto-indent-point
      (neo-point-auto-indent)))
  (neo-global--select-window))

(defun neotree-click-changes-root-toggle ()
  "Toggle the variable neo-click-changes-root.
If true, clicking on a directory will change the current root to
the directory instead of showing the directory contents."
  (interactive)
  (setq neo-click-changes-root (not neo-click-changes-root)))

(defun neo-open-dir (full-path &optional arg)
  "Toggle fold a directory node.

FULL-PATH is the path of the directory.
ARG is ignored."
  (if neo-click-changes-root
      (neotree-change-root)
    (progn
      (let ((new-state (neo-buffer--toggle-expand full-path)))
        (neo-buffer--refresh t)
        (when neo-auto-indent-point
          (when new-state (forward-line 1))
          (neo-point-auto-indent))))))

(defun neo-open-dired (full-path &optional arg)
  "Open file or directory node in `dired-mode'.

FULL-PATH is the path of node.
ARG is same as `neo-open-file'."
  (neo-global--select-mru-window arg)
  (dired full-path))

(defun neo-open-file (full-path &optional arg)
  "Open a file node.

FULL-PATH is the file path you want to open.
If ARG is an integer then the node is opened in a window selected via
`winum' or`window-numbering' (if available) according to the passed number.
If ARG is `|' then the node is opened in new vertically split window.
If ARG is `-' then the node is opened in new horizontally split window."
  (neo-global--select-mru-window arg)
  (find-file full-path))

(defun neo-open-file-vertical-split (full-path arg)
  "Open the current node is a vertically split window.
FULL-PATH and ARG are the same as `neo-open-file'."
  (neo-open-file full-path "|"))

(defun neo-open-file-horizontal-split (full-path arg)
  "Open the current node is horizontally split window.
FULL-PATH and ARG are the same as `neo-open-file'."
  (neo-open-file full-path "-"))

(defun neo-open-file-ace-window (full-path arg)
  "Open the current node in a window chosen by ace-window.
FULL-PATH and ARG are the same as `neo-open-file'."
  (neo-open-file full-path "a"))

(defun neotree-open-file-in-system-application ()
  "Open a file under point in the system application."
  (interactive)
  (call-process neo-default-system-application nil 0 nil
                (neo-buffer--get-filename-current-line)))

(defun neotree-change-root ()
  "Change root to current node dir.
If current node is a file, then it will do nothing.
If cannot find any node in current line, it equivalent to using `neotree-dir'."
  (interactive)
  (neo-global--select-window)
  (let ((btn-full-path (neo-buffer--get-filename-current-line)))
    (if (null btn-full-path)
        (call-interactively 'neotree-dir)
      (neo-global--open-dir btn-full-path))))

(defun neotree-select-up-node ()
  "Select the parent directory of the current node. Change the root if
necessary. "
  (interactive)
  (neo-global--select-window)
  (let* ((btn-full-path (neo-buffer--get-filename-current-line))
         (btn-parent-dir (if btn-full-path (file-name-directory btn-full-path)))
         (root-slash (file-name-as-directory neo-buffer--start-node)))
    (cond
     ((equal btn-parent-dir root-slash) (neo-global--open-dir root-slash))
     (btn-parent-dir (neotree-find btn-parent-dir))
     (t (neo-global--open-dir (file-name-directory
                               (directory-file-name root-slash)))))))

(defun neotree-select-down-node ()
  "Select an expanded directory or content directory according to the
current node, in this order:
- select the first expanded child node if the current node has one
- select the content of current node if it is expanded
- select the next expanded sibling if the current node is not expanded."
  (interactive)
  (let* ((btn-full-path (neo-buffer--get-filename-current-line))
         (path (if btn-full-path btn-full-path neo-buffer--start-node))
         (nodes (neo-buffer--get-nodes-for-select-down-node path)))
    (when nodes
      (if (or (equal path neo-buffer--start-node)
              (neo-buffer--expanded-node-p path))
          ;; select the first expanded child node
          (let ((expanded-dir (catch 'break
                                (dolist (node (car nodes))
                                  (if (neo-buffer--expanded-node-p node)
                                      (throw 'break node)))
                                nil)))
            (if expanded-dir
                (neotree-find expanded-dir)
              ;; select the directory content if needed
              (let ((dirs (car nodes))
                    (files (cdr nodes)))
                (if (> (length dirs) 0)
                    (neotree-find (car dirs))
                  (when (> (length files) 0)
                    (neotree-find (car files)))))))
        ;; select the next expanded sibling
        (let ((sibling (neo-buffer--sibling path)))
          (while (and (not (neo-buffer--expanded-node-p sibling))
                      (not (equal sibling path)))
            (setq sibling (neo-buffer--sibling sibling)))
          (when (not (string< sibling path))
            ;; select next expanded sibling
            (neotree-find sibling)))))))

(defun neotree-select-next-sibling-node ()
  "Select the next sibling of current node.
If the current node is the last node then the first node is selected."
  (interactive)
  (let ((sibling (neo-buffer--sibling (neo-buffer--get-filename-current-line))))
    (when sibling (neotree-find sibling))))

(defun neotree-select-previous-sibling-node ()
  "Select the previous sibling of current node.
If the current node is the first node then the last node is selected."
  (interactive)
  (let ((sibling (neo-buffer--sibling (neo-buffer--get-filename-current-line) t)))
    (when sibling (neotree-find sibling))))

(defun neotree-create-node (filename)
  "Create a file or directory use specified FILENAME in current node."
  (interactive
   (let* ((current-dir (neo-buffer--get-filename-current-line neo-buffer--start-node))
          (current-dir (neo-path--match-path-directory current-dir))
          (filename (read-file-name "Filename:" current-dir)))
     (if (file-directory-p filename)
         (setq filename (concat filename "/")))
     (list filename)))
  (catch 'rlt
    (let ((is-file nil))
      (when (= (length filename) 0)
        (throw 'rlt nil))
      (setq is-file (not (equal (substring filename -1) "/")))
      (when (file-exists-p filename)
        (message "File %S already exists." filename)
        (throw 'rlt nil))
      (when (and is-file
                 (funcall neo-confirm-create-file (format "Do you want to create file %S ?"
                                                          filename)))
        ;; ensure parent directory exist before saving
        (mkdir (substring filename 0 (+ 1 (cl-position ?/ filename :from-end t))) t)
        ;; NOTE: create a empty file
        (write-region "" nil filename)
        (neo-buffer--save-cursor-pos filename)
        (neo-buffer--refresh nil)
        (if neo-create-file-auto-open
            (find-file-other-window filename)))
      (when (and (not is-file)
                 (funcall neo-confirm-create-directory (format "Do you want to create directory %S?"
                                                               filename)))
        (mkdir filename t)
        (neo-buffer--save-cursor-pos filename)
        (neo-buffer--refresh nil)))))

(defun neotree-delete-node ()
  "Delete current node."
  (interactive)
  (let* ((filename (neo-buffer--get-filename-current-line))
         (buffer (find-buffer-visiting filename))
         (deleted-p nil))
    (catch 'end
      (if (null filename) (throw 'end nil))
      (if (not (file-exists-p filename)) (throw 'end nil))
      (if (not (funcall neo-confirm-delete-file (format "Do you really want to delete %S?"
                                                        filename)))
          (throw 'end nil))
      (if (file-directory-p filename)
          ;; delete directory
          (progn
            (unless (neo-path--has-subfile-p filename)
              (delete-directory filename)
              (setq deleted-p t)
              (throw 'end nil))
            (when (funcall neo-confirm-delete-directory-recursively
                           (format "%S is a directory, delete it recursively?"
                                   filename))
              (when (funcall neo-confirm-kill-buffers-for-files-in-directory
                             (format "kill buffers for files in directory %S?"
                                     filename))
                (neo-util--kill-buffers-for-path filename))
              (delete-directory filename t)
              (setq deleted-p t)))
        ;; delete file
        (progn
          (delete-file filename)
          (when buffer
            (kill-buffer-ask buffer))
          (setq deleted-p t))))
    (when deleted-p
      (message "%S deleted." filename)
      (neo-buffer--refresh t))
    filename))

(defun neotree-rename-node ()
  "Rename current node."
  (interactive)
  (neo-buffer--rename-node))

(defun neotree-copy-node ()
  "Copy current node."
  (interactive)
  (neo-buffer--copy-node))

(defun neotree-hidden-file-toggle ()
  "Toggle show hidden files."
  (interactive)
  (neo-buffer--set-show-hidden-file-p (not neo-buffer--show-hidden-file-p)))

(defun neotree-empty-fn ()
  "Used to bind the empty function to the shortcut."
  (interactive))

(defun neotree-refresh (&optional is-auto-refresh)
  "Refresh the NeoTree buffer."
  (interactive)
  (if (eq (current-buffer) (neo-global--get-buffer))
      (neo-buffer--refresh t)
    (save-excursion
      (let ((cw (selected-window)))  ;; save current window
        (if is-auto-refresh
            (let ((origin-buffer-file-name (buffer-file-name)))
              (when (and (fboundp 'projectile-project-p)
                         (projectile-project-p)
                         (fboundp 'projectile-project-root))
                (neo-global--open-dir (projectile-project-root))
                (neotree-find (projectile-project-root)))
              (neotree-find origin-buffer-file-name))
          (neo-buffer--refresh t t))
        (recenter)
        (when (or is-auto-refresh neo-toggle-window-keep-p)
          (select-window cw))))))

(defun neotree-stretch-toggle ()
  "Make the NeoTree window toggle maximize/minimize."
  (interactive)
  (neo-global--with-window
    (if (neo-window--minimize-p)
        (neo-window--zoom 'maximize)
      (neo-window--zoom 'minimize))))

;;;###autoload
(defun neotree-projectile-action ()
  "Integration with `Projectile'.

Usage:
    (setq projectile-switch-project-action 'neotree-projectile-action).

When running `projectile-switch-project' (C-c p p), `neotree' will change root
automatically."
  (interactive)
  (cond
   ((fboundp 'projectile-project-root)
    (neotree-dir (projectile-project-root)))
   (t
    (error "Projectile is not available"))))

;;;###autoload
(defun neotree-toggle ()
  "Toggle show the NeoTree window."
  (interactive)
  (if (neo-global--window-exists-p)
      (neotree-hide)
    (neotree-show)))

;;;###autoload
(defun neotree-show ()
  "Show the NeoTree window."
  (interactive)
  (let ((cw (selected-window)))  ;; save current window
    (if neo-smart-open
        (neotree-find)
      (neo-global--open))
    (neo-global--select-window)
    (when neo-toggle-window-keep-p
      (select-window cw))))

;;;###autoload
(defun neotree-hide ()
  "Close the NeoTree window."
  (interactive)
  (if (neo-global--window-exists-p)
      (delete-window neo-global--window)))

;;;###autoload
(defun neotree-dir (path)
  "Show the NeoTree window, and change root to PATH."
  (interactive "DDirectory: ")
  (neo-global--open-dir path)
  (neo-global--select-window))

;;;###autoload
(defalias 'neotree 'neotree-show "Show the NeoTree window.")

;;
;; backward compatible
;;

(defun neo-bc--make-obsolete-message (from to)
  (message "Warning: `%S' is obsolete. Use `%S' instead." from to))

(defun neo-buffer--enter-file (path)
  (neo-bc--make-obsolete-message 'neo-buffer--enter-file 'neo-open-file))

(defun neo-buffer--enter-dir (path)
  (neo-bc--make-obsolete-message 'neo-buffer--enter-dir 'neo-open-dir))

(defun neotree-enter (&optional arg)
  "NeoTree typical open event.
ARG are the same as `neo-open-file'."
  (interactive "P")
  (neo-buffer--execute arg 'neo-open-file 'neo-open-dir))

(defun neotree-quick-look (&optional arg)
  "Quick Look like NeoTree open event.
ARG are the same as `neo-open-file'."
  (interactive "P")
  (neotree-enter arg)
  (neo-global--select-window))

(defun neotree-enter-vertical-split ()
  "NeoTree open event, file node will opened in new vertically split window."
  (interactive)
  (neo-buffer--execute nil 'neo-open-file-vertical-split 'neo-open-dir))

(defun neotree-enter-horizontal-split ()
  "NeoTree open event, file node will opened in new horizontally split window."
  (interactive)
  (neo-buffer--execute nil 'neo-open-file-horizontal-split 'neo-open-dir))

(defun neotree-enter-ace-window ()
  "NeoTree open event, file node will be opened in window chosen by ace-window."
  (interactive)
  (neo-buffer--execute nil 'neo-open-file-ace-window 'neo-open-dir))

(defun neotree-copy-filepath-to-yank-ring ()
  "Neotree convenience interactive function: file node path will be added to the kill ring."
  (interactive)
  (kill-new (neo-buffer--get-filename-current-line)))

(defun neotree-split-window-sensibly (&optional window)
  "An neotree-version of split-window-sensibly,
which is used to fix issue #209.
(setq split-window-preferred-function 'neotree-split-window-sensibly)"
  (let ((window (or window (selected-window))))
    (or (split-window-sensibly window)
        (and (get-buffer-window neo-buffer-name)
             (not (window-minibuffer-p window))
             ;; If WINDOW is the only window on its frame
             ;; (or only include Neo window) and is not the
             ;; minibuffer window, try to split it vertically disregarding
             ;; the value of `split-height-threshold'.
             (let ((split-height-threshold 0))
               (when (window-splittable-p window)
                 (with-selected-window window
                   (split-window-below))))))))

(provide 'neotree)
;;; neotree.el ends here