#+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-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))
    :config
    (require 'evil-leader)
    (global-evil-leader-mode)
    (evil-mode t)

    (define-key evil-normal-state-map "\C-W s" 'evil-window-split)
    (define-key evil-normal-state-map "\C-W v" 'evil-window-vsplit)
    (define-key evil-normal-state-map "\C-h" 'evil-window-left)
    (define-key evil-normal-state-map "\C-j" 'evil-window-down)
    (define-key evil-normal-state-map "\C-k" 'evil-window-up)
    (define-key evil-normal-state-map "\C-l" 'evil-window-right)
    (define-key evil-normal-state-map (kbd "C->") (lambda () (interactive) (evil-window-increase-width 3)))
    (define-key evil-normal-state-map (kbd "C-<") (lambda () (interactive) (evil-window-decrease-width 3)))
    (define-key evil-normal-state-map (kbd "C-+") (lambda () (interactive) (evil-window-increase-height 3)))
    (define-key evil-normal-state-map (kbd "C--") (lambda () (interactive) (evil-window-decrease-height 3)))
    (define-key evil-normal-state-map (kbd "C-=") (lambda () (interactive) (balance-windows))))
#+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)
    "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

** state key mapping
#+BEGIN_SRC emacs-lisp :tangle yes :results silent
  (with-eval-after-load "evil"
    (define-key evil-normal-state-map (kbd "C-SPC") 'mode-line-other-buffer)
    (define-key evil-normal-state-map (kbd "C-;") 'previous-multiframe-window)
    (evil-define-key 'emacs eshell-mode-map (kbd "C-;") 'previous-multiframe-window))
#+END_SRC

** face attribute
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
* 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
  (use-package evil-leader
    :ensure t
    :config
    (global-evil-leader-mode)
    (evil-leader/set-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))

#+END_SRC

* 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
* Provide 
#+BEGIN_SRC emacs-lisp :tangle yes :results silent
  (provide 'init-evil-mode)
#+END_SRC