dotfiles/emacs

;; TODO:
;; Easier undo tree traversal
;; Test easing spelling navigation, map ]s and [s to next and previously wrong word
;; Replace evil-leader with general

;;;; Startup
(setq initial-scratch-message "")

;;;; Base

;; Disable beep & flash
(setq ring-bell-function 'ignore)

;; Disable blinking cursor
(blink-cursor-mode 0)
  
;; TODO finish fixing eval-last-s-exp
;;(defun evil-eval-prev-exp ()
  ;;(interactive)
  ;;(evil-append 1)
  ;;(call-interactively (global-key-binding "\C-x"))
  ;;(call-interactively (global-key-binding "\C-e"))
  ;;(evil-normal-state))


;; All yes or no prompts are y or n
(defalias 'yes-or-no-p 'y-or-n-p)

;; Never follow symlinks
(setq vc-follow-symlinks nil)

;;; Leave the OS clipboard alone (use evil's "+ and "* instead)
; Don't copy and paste to the clipboard
(setq select-enable-clipboard nil)
; Don't save to the clipboard on exit
(setq x-select-enable-clipboard-manager nil)

;; Text and Notes
(setq sentence-end-double-space nil)

;; Save minibar history
(savehist-mode 1)
(setq savehist-additional-variables '(kill-ring search-ring regexp-search-ring))

;; Auto-enable elisp when opening .emacs in dotfiles (without the .)
(add-to-list 'auto-mode-alist '("emacs" . emacs-lisp-mode))

;; Start in text-mode
(setq initial-major-mode 'text-mode)


;; Backups (from https://stackoverflow.com/questions/151945/how-do-i-control-how-emacs-makes-backup-files/20824625#20824625)
(setq version-control t     ;; Use version numbers for backups.
      kept-new-versions 10  ;; Number of newest versions to keep.
      kept-old-versions 0   ;; Number of oldest versions to keep.
      delete-old-versions t ;; Don't ask to delete excess backup versions.
      backup-by-copying t)  ;; Copy all files, don't rename them.

(setq vc-make-backup-files t)   ;; Backup versioned files

;; Default and per-save backups go here:
(setq backup-directory-alist '(("" . "~/.emacs.d/backups/per-save")))

(defun force-backup-of-buffer ()
  ;; Make a special "per session" backup at the first save of each
  ;; emacs session.
  (when (not buffer-backed-up)
    ;; Override the default parameters for per-session backups.
    (let ((backup-directory-alist '(("" . "~/.emacs.d/backup/per-session")))
          (kept-new-versions 3))
      (backup-buffer)))
  ;; Make a "per save" backup on each save.  The first save results in
  ;; both a per-session and a per-save backup, to keep the numbering
  ;; of per-save backups consistent.
  (let ((buffer-backed-up nil))
    (backup-buffer)))

(add-hook 'before-save-hook  'force-backup-of-buffer)


;; Disable toolbar
(when (display-graphic-p)
  (tool-bar-mode -1)
  )

;;;; Packages

;; Package installation
(require 'package)

(add-to-list 'package-archives '("org" . "http://orgmode.org/elpa/"))
(add-to-list 'package-archives '("melpa" . "http://melpa.org/packages/"))
(add-to-list 'package-archives '("melpa-stable" . "http://stable.melpa.org/packages/"))

(setq package-enable-at-startup nil)
(package-initialize)

;; Keep track of whether or not we need to refresh package contents
(setq packages-installed-this-session 0)

;; Function to ensure every package in installed, and ask if it isn't.
(defun ensure-package-installed (&rest packages)
  (mapcar
   (lambda (package)
	 (if (package-installed-p package)
	     nil
	   (if (y-or-n-p (format "Package %s is missing. Install it? " package))
	       ;; If this is the 1st install this session, update before install
	       (cond ((eq packages-installed-this-session 0)
		      (package-refresh-contents)
		      (setq packages-installed-this-session 1)
		      (package-install package))
		     (t (package-install package))
		 nil)
	     package)))
   packages))

;; List of packages to install on all systems
(setq required-packages
      '(
	iedit
	magit
	evil-magit
	undo-tree
	evil
	evil-leader
	evil-tabs
	powerline-evil
	monokai-theme
	auto-complete
	linum-relative
	multi-term
	neotree
	evil-numbers
	editorconfig
	))

;; List of optional packages
(setq optional-packages
      '(
	flymd
	markdown-mode
	latex-preview-pane
	tide
	web-mode
	ac-html
	racket-mode
	fuzzy
	general))


;; Check that all packages are installed
(apply 'ensure-package-installed required-packages)

;; Declare function for optional packages
(defun optional-packages-install ()
    (interactive)
  (apply 'ensure-package-installed optional-packages))
 

;; Activate installed packages
(package-initialize)


;;; Evil

;; No C-i jump
(setq evil-want-C-i-jump nil)

;; Evil tabs
(global-evil-tabs-mode t)

;; Default to evil mode
(evil-mode t)

;; Move all elements of evil-emacs-state-modes to evil-motion-state-modes
(setq evil-motion-state-modes (append evil-emacs-state-modes evil-motion-state-modes))
(setq evil-emacs-state-modes nil)

;; Delete info bindings for evil to take over
(define-key Info-mode-map "g" nil)
(define-key Info-mode-map "n" nil)
(define-key Info-mode-map "p" nil)

;; Vim removing of windows
(define-key evil-window-map (kbd "q") 'delete-window)
(define-key evil-window-map (kbd "C-q") 'delete-window)

; Don't echo evil's states
(setq evil-insert-state-message nil)
(setq evil-visual-state-message nil)

;; Increment and decrement (evil-numbers)
(define-key evil-insert-state-map (kbd "C-a") 'evil-numbers/inc-at-pt)
(define-key evil-insert-state-map (kbd "C-d") 'evil-numbers/dec-at-pt)

;;; undo-tree

;; Save undo history under .emacs.d/undo
(setq undo-tree-auto-save-history t
         undo-tree-history-directory-alist
         `(("." . ,(concat user-emacs-directory "undo"))))
   (unless (file-exists-p (concat user-emacs-directory "undo"))
(make-directory (concat user-emacs-directory "undo")))


;;; Powerline

(require 'powerline)
(powerline-evil-center-color-theme)


;;; Recent Files

(require 'recentf)
(recentf-mode 1)
(setq recentf-max-saved-items 200
      recentf-max-menu-items 15)


;;; Web mode

;; 2 spaces for an indent
(defun my-web-mode-hook ()
  "Hooks for Web mode."
  (setq web-mode-markup-indent-offset 2)
)
(add-hook 'web-mode-hook  'my-web-mode-hook)

;; Auto-enable web-mode when opening relevent files
(add-to-list 'auto-mode-alist '("\\.html\\'" . web-mode))
(add-to-list 'auto-mode-alist '("\\.hbs\\'" . web-mode))
(add-to-list 'auto-mode-alist '("\\.handlebars\\'" . web-mode))


;;; Autocomplete

(require 'auto-complete)

;; start auto-complete
(eval-and-compile
  (require 'auto-complete nil 'noerror))
(ac-config-default)
(setq ac-auto-start t)

(global-set-key (kbd "<backtab>") 'ac-previous)

;; ac-html
(setq web-mode-ac-sources-alist
  '(("css" . (ac-source-css-property))
    ("html" . (ac-source-words-in-buffer ac-source-abbrev))))
(ac-linum-workaround)

(setq ac-auto-show-menu t)

;;; Spelling

;; map ]s and [s to next and previously wrong word

;; move point to previous error
;; based on code by hatschipuh at
;; http://emacs.stackexchange.com/a/14912/2017
(defun flyspell-goto-previous-error (arg)
  "Go to arg previous spelling error."
  (interactive "p")
  (while (not (= 0 arg))
    (let ((pos (point))
          (min (point-min)))
      (if (and (eq (current-buffer) flyspell-old-buffer-error)
               (eq pos flyspell-old-pos-error))
          (progn
            (if (= flyspell-old-pos-error min)
                ;; goto beginning of buffer
                (progn
                  (message "Restarting from end of buffer")
                  (goto-char (point-max)))
              (backward-word 1))
            (setq pos (point))))
      ;; seek the next error
      (while (and (> pos min)
                  (let ((ovs (overlays-at pos))
                        (r '()))
                    (while (and (not r) (consp ovs))
                      (if (flyspell-overlay-p (car ovs))
                          (setq r t)
                        (setq ovs (cdr ovs))))
                    (not r)))
        (backward-word 1)
        (setq pos (point)))
      ;; save the current location for next invocation
      (setq arg (1- arg))
      (setq flyspell-old-pos-error pos)
      (setq flyspell-old-buffer-error (current-buffer))
      (goto-char pos)
      (if (= pos min)
          (progn
            (message "No more miss-spelled word!")
            (setq arg 0))
        ))))

(global-set-key (kbd "C-=") 'flyspell-goto-next-error)
(global-set-key (kbd "M-=") 'flyspell-goto-previous-error)


;;; Relative line numbers

(require 'linum-relative)
(setq linum-relative-current-symbol "")
(linum-mode)
(linum-relative-global-mode)


;;; flymd

; flymd.md and flymd.html are deleted upon markdown buffer killed
(setq flymd-close-buffer-delete-temp-files t)


;;; evil-leader

;; Evil leader is Space
(global-evil-leader-mode)
(evil-leader/set-leader "<SPC>")

;; Leader keybinds
(evil-leader/set-key
 "d" 'diff-buffer-with-file
 "b" 'buffer-menu
 ;"f" '(lambda ()  (interactive) (dired '"./"))
 "f" 'neotree-toggle
 "u" 'undo-tree-visualize
 "m" 'recentf-open-files
 "l" 'auto-fill-mode
 "s" '(lambda () (interactive) (if flyspell-mode (funcall 'flyspell-mode '0) (flyspell-mode) (flyspell-buffer)))
 "a" 'auto-complete-mode
 "g" 'magit-status
 "M-g" 'magit-dispatch-popup
 )


;; Magit
(require 'magit)
(setq evil-magit-state 'normal)
(require 'evil-magit)
(global-magit-file-mode)


;; Neotree

; Set vi-like bindings in neotree-mode that don't conflict with evil
(evil-define-key 'normal neotree-mode-map (kbd "TAB") 'neotree-enter)
(evil-define-key 'normal neotree-mode-map (kbd "SPC") 'neotree-enter)
(evil-define-key 'normal neotree-mode-map (kbd "q") 'neotree-hide)
(evil-define-key 'normal neotree-mode-map (kbd "RET") 'neotree-enter)
(evil-define-key 'normal neotree-mode-map (kbd "h") 'neotree-hidden-file-toggle)

;Every time when the neotree window is opened, let it find current file and jump to node.
(setq neo-smart-open t)


;; tide/typescript

(setq typescript-indent-level 2)

;; JavaScript
(setq js-indent-level 2)


;; geiser
(add-to-list 'auto-mode-alist '("\\.scm\\'" . scheme-mode))

;; editorconfig
(editorconfig-mode 1)

;;;; System-specific configs

(defun win-setup ()
    (add-to-list 'exec-path "C:/Program Files (x86)/Aspell/bin/")
    (setq ispell-program-name "aspell")

    (defun cmd ()
      (interactive)
	(make-comint-in-buffer "cmd" nil "cmd" nil)
	(switch-to-buffer "*cmd*")))

(defun linux-setup ())

(cond ((eq system-type 'windows-nt) (win-setup))
      ((eq system-type 'gnu/linux) (linux-setup))
      (t (message "")))


;;;; Custom
(defconst custom-file (expand-file-name "custom.el" user-emacs-directory))

;; if no custom file exists, write a default one
(unless (file-exists-p custom-file)
  (write-region "(custom-set-faces
 ;; custom-set-faces was added by Custom.
 ;; If you edit it by hand, you could mess it up, so be careful.
 ;; Your init file should contain only one such instance.
 ;; If there is more than one, they won't work right.
 '(powerline-evil-normal-face ((t (:background \"#859900\")))))
(custom-set-variables
 ;; custom-set-variables was added by Custom.
 ;; If you edit it by hand, you could mess it up, so be careful.
 ;; Your init file should contain only one such instance.
 ;; If there is more than one, they won't work right.
 '(custom-enabled-themes (quote (monokai)))
 '(custom-safe-themes
   (quote
    (\"c7a9a68bd07e38620a5508fef62ec079d274475c8f92d75ed0c33c45fbe306bc\" default))))
" nil custom-file))
(load custom-file)