#+TITLE:Emacs Evil Config
#+AUTHOR: Peng Li
#+EMAIL: seudut@gmail.com
 
As the =Evil= mode is significant, and has lots of configurations, it's better put them 
in a separate file.

* Evil mode 
** Install and basic config
https://www.emacswiki.org/emacs/Evil.
=global-evil-leader-mode= should be set before =evil-mode=.
#+BEGIN_SRC emacs-lisp :tangle yes :results silent
  (use-package evil
    :ensure t
    :init
    ;; (setq evil-default-state 'emacs)
    (setq evil-emacs-state-cursor '("red" box))
    (setq evil-normal-state-cursor '("green" box))
    (setq evil-motion-state-cursor '("green" box))
    (setq evil-visual-state-cursor '("orange" box))
    (setq evil-insert-state-cursor '("red" bar))
    (setq evil-replace-state-cursor '("red" bar))
    (setq evil-operator-state-cursor '("red" hollow))
    ;; others, don't move back cursor when exit insert mode
    (setq evil-move-cursor-back nil)
    :config
    (use-package evil-leader
      :ensure t
      :init
      :config
      (evil-leader/set-leader ";")
      (global-evil-leader-mode))
    ;; (require 'evil-leader)
    (evil-mode t))

  (add-hook 'prog-mode-hook #'(lambda ()
                                (modify-syntax-entry ?_ "w")
                                ;; (modify-syntax-entry ?- "w")
                                ))
#+END_SRC

** Initial mode and state config
- Use =normal= as the default state but exclude some special modes.
- Bind =[escape]=  to =normal= mode. This only works on GUI Emacs. If need to work on Terminal, shoudl also bind =(kbd
  "<ESC>)=, but this will make the combined key =M-= not wor.
- Not alias =insert= state to =emacs= state, as it break some vi's feature in insert mode, such as column edit. Instead,
  here add a advice function to change the sate as emacs when enter insert mode, but this is only limited in some
  certain modes.
#+BEGIN_SRC emacs-lisp :tangle yes :results silent
  (defvar my-mode-list-to-use-emacs-as-insert '(emacs-lisp-mode
                                                org-mode
                                                eshell-mode
                                                lisp-interaction-mode)
    "The mode in this list will consider insert state as emacs state by adding `advice-add' below.")

  (defvar my-modes-use-emacs-init '(emacs-lisp-mode
                                    org-mode
                                    lisp-interaction-mode
                                    eshell-mode
                                    text-mode
                                    package-menu-mode
                                    paradox-menu-mode)
    "The mode in this list will use emacs sate as a initial evil state.")

  (with-eval-after-load "evil"
    (setq evil-default-state 'normal)
      ;; (defalias 'evil-inset-mode 'evil-emacs-state)
    (define-key evil-emacs-state-map [escape] 'evil-normal-state)
    ;; (define-key evil-emacs-state-map (kbd "<ESC>") 'evil-normal-state)
    (dolist (mode my-modes-use-emacs-init) (evil-set-initial-state mode 'emacs))
    (advice-add 'evil-insert-state :after (lambda (&optional arg)
                                            (when (memq major-mode my-mode-list-to-use-emacs-as-insert)
                                              (evil-emacs-state)))))
#+END_SRC

* Evil-escape
[[https://github.com/syl20bnr/evil-escape][evil-escape]], escape from anything with customizable key sequence.
#+BEGIN_SRC emacs-lisp :tangle yes :results silent
  (use-package evil-escape
    :ensure t
    :init
    (setq-default evil-escape-delay 0.2)
    (setq-default evil-escape-key-sequence "jj")
    (setq-default evil-escape-excluded-states '(normal visual motion emacs))
    (setq-default evil-escape-excluded-major-modes '(emacs-lisp-mode org-mode))
    :config
    (evil-escape-mode))
#+END_SRC

* Evil-Leader
#+BEGIN_SRC emacs-lisp :tangle yes :results silent
  (with-eval-after-load "evil-leader"
    ;; Buffer & File
    (evil-leader/set-key "f" 'ido-switch-buffer)
    (evil-leader/set-key "w" 'evil-save)
    (evil-leader/set-key "r" 'ivy-recentf)
    (evil-leader/set-key "w" 'save-buffer)
    (evil-leader/set-key "o" 'ido-find-file)
    (evil-leader/set-key "p" 'projectile-find-file)
    ;; Window
    (evil-leader/set-key "s" 'evil-window-split)
    (evil-leader/set-key "v" 'evil-window-vsplit)
    (evil-leader/set-key "q" 'evil-quit)
    ;; others
    (evil-leader/set-key "h" 'help)
    (evil-leader/set-key "g" 'magit-status)
    (evil-leader/set-key "d" 'dired)
    (evil-leader/set-key "e" 'sd/toggle-project-eshell))

  (with-eval-after-load "evil"
    (evil-define-key 'emacs eshell-mode-map (kbd ";e") 'sd/toggle-project-eshell)
    (evil-define-key 'emacs eshell-mode-map (kbd ";d") 'dired)
    (evil-define-key 'emacs eshell-mode-map (kbd "C-;") 'mode-line-other-buffer))

#+END_SRC

* other extention
** Evil-matchit
[[https://github.com/redguardtoo/evil-matchit]]
#+BEGIN_SRC emacs-lisp :tangle yes :results silent
  (use-package evil-matchit
    :ensure t
    :config
    (global-evil-matchit-mode 1))
#+END_SRC

** Evil-visualstar
#+BEGIN_SRC emacs-lisp :tangle yes :results silent
  (use-package evil-visualstar
    :ensure t
    :init
    (setq evil-visualstar/persistent t)
    :config
    (global-evil-visualstar-mode))
#+END_SRC

** Evil-surround
#+BEGIN_SRC emacs-lisp :tangle yes :results silent
  (use-package evil-surround
    :ensure t
    :config
    (global-evil-surround-mode 1))
#+END_SRC
* Key bindings
There are three kinds key bindings
- prefix key is the leader key, defined by evil-leader. *;*
- prefix key is the =Ctrl=,
- prefix key is =\=, 

#+BEGIN_SRC emacs-lisp :tangle yes :results silent
  (with-eval-after-load "evil"
    (mapc (lambda (map)
            (define-key map "\C-W s" 'evil-window-split)
            (define-key map "\C-W v" 'evil-window-vsplit)
            (define-key map "\C-h" 'evil-window-left)
            (define-key map "\C-j" 'evil-window-down)
            (define-key map "\C-k" 'evil-window-up)
            (define-key map "\C-l" 'evil-window-right)
            (define-key map (kbd "C->") (lambda () (interactive) (evil-window-increase-width 3)))
            (define-key map (kbd "C-<") (lambda () (interactive) (evil-window-decrease-width 3)))
            (define-key map (kbd "C-+") (lambda () (interactive) (evil-window-increase-height 3)))
            (define-key map (kbd "C--") (lambda () (interactive) (evil-window-decrease-height 3)))
            (define-key map (kbd "C-=") (lambda () (interactive) (balance-windows))))
          (list evil-normal-state-map evil-motion-state-map))
    ;; normal state
    (define-key evil-normal-state-map (kbd "C-SPC") 'mode-line-other-buffer)
    (define-key evil-normal-state-map (kbd "C-;") 'previous-multiframe-window)
    ;; insert state
    (define-key evil-insert-state-map (kbd "C-p") 'previous-line)
    (define-key evil-insert-state-map (kbd "C-n") 'next-line)
    (define-key evil-insert-state-map (kbd "C-h") 'delete-backward-char)
    (define-key evil-insert-state-map (kbd "C-a") 'move-beginning-of-line)
    (define-key evil-insert-state-map (kbd "C-e") 'move-end-of-line)
    (define-key evil-insert-state-map (kbd "C-k") 'kill-line)
    ;; motion mode
    (define-key evil-motion-state-map (kbd "SPC") 'scroll-up-command)
    (define-key evil-motion-state-map (kbd "S-SPC") 'scroll-down-command))
#+END_SRC


Let the search highlight persistent, https://stackoverflow.com/questions/25768036/emacs-evil-non-incremental-search-and-persistent-highlighting/34252236
#+BEGIN_SRC emacs-lisp :tangle yes :results silent
  (evil-select-search-module 'evil-search-module 'evil-search)

  (with-eval-after-load "evil"
    (define-key evil-normal-state-map "\\" nil)
    (define-key evil-normal-state-map "\\\\" #'evil-ex-nohighlight))
#+END_SRC

- Dired mode
#+BEGIN_SRC emacs-lisp :tangle yes :results silent
  (with-eval-after-load "evil"
    ;; file and directory explore
    (define-key dired-mode-map (kbd "C-h") nil)
    (define-key dired-mode-map (kbd "C-k") nil)
    (evil-define-key 'normal dired-mode-map (kbd "H") 'dired-omit-mode)
    (evil-define-key 'normal dired-mode-map (kbd "g") 'dired-goto-file)
    (evil-define-key 'normal dired-mode-map (kbd "r") 'revert-buffer)
    (evil-define-key 'normal dired-mode-map (kbd "i") 'dired-maybe-insert-subdir)
    (evil-define-key 'normal dired-mode-map (kbd "TAB") 'diredp-next-subdir)
    (evil-define-key 'normal dired-mode-map (kbd "J") 'diredp-next-subdir)
    (evil-define-key 'normal dired-mode-map (kbd "K") 'diredp-prev-subdir)
    (evil-define-key 'normal dired-mode-map (kbd "l") 'dired-display-file)
    (evil-define-key 'normal dired-mode-map (kbd "f") 'dired-narrow)
    (evil-define-key 'normal dired-mode-map (kbd "j") 'sd/dired-next-line)
    (evil-define-key 'normal dired-mode-map (kbd "k") 'sd/dired-previous-line)
    (evil-define-key 'normal dired-mode-map (kbd "h") 'sd/dired-up-directory)
    (evil-define-key 'normal dired-mode-map [C-backspace] 'dired-up-directory)
    ;; file and folder deletion
    (evil-define-key 'normal dired-mode-map (kbd "m") 'dired-mark)
    (evil-define-key 'normal dired-mode-map (kbd "u") 'dired-unmark)
    (evil-define-key 'normal dired-mode-map (kbd "U") 'dired-unmark-all-marks)
    (evil-define-key 'normal dired-mode-map (kbd "z") #'sd/dired-get-size)
    (evil-define-key 'normal dired-mode-map (kbd "d") 'dired-flag-file-deletion)
    (evil-define-key 'normal dired-mode-map (kbd "x") 'dired-do-flagged-delete)
    (evil-define-key 'normal dired-mode-map (kbd "D") 'dired-do-delete)
    ;; File and folder creation
    (evil-define-key 'normal dired-mode-map (kbd "c") 'sd/dired-new-file)
    (evil-define-key 'normal dired-mode-map (kbd "+") 'dired-create-directory)
    (evil-define-key 'normal dired-mode-map (kbd "C") 'dired-do-copy)
    (evil-define-key 'normal dired-mode-map (kbd "R") 'dired-do-rename)

    ;; keep some normap mapping
    (evil-define-key 'normal dired-mode-map (kbd "/") 'evil-ex-search-forward)
    (evil-define-key 'normal dired-mode-map (kbd "n") 'evil-search-next)
    (evil-define-key 'normal dired-mode-map (kbd "N") 'evil-search-previous)
    (evil-define-key 'normal dired-mode-map (kbd "v") 'evil-visual-char))

#+END_SRC

- expand region
#+BEGIN_SRC emacs-lisp :tangle yes :results silent
  (with-eval-after-load "evil"
    (with-eval-after-load "expand-region"
      (define-key evil-normal-state-map (kbd "SPC") 'er/expand-region)
      (define-key evil-visual-state-map (kbd "SPC") 'er/expand-region)
      (define-key evil-visual-state-map (kbd "S-SPC") 'er/contract-region)
      (define-key evil-normal-state-map (kbd "S-SPC") 'er/contract-region)))
#+END_SRC

* Others
#+BEGIN_SRC emacs-lisp :tangle yes :results silent
  (dolist (mode '(c-mode-hook lua-mode-hook))
    (add-hook mode (lambda () (setq indent-tabs-mode nil))))
#+END_SRC
* Provide 
#+BEGIN_SRC emacs-lisp :tangle yes :results silent
  (provide 'init-evil-mode)
#+END_SRC