essentials/dotfiles/emacs.d/init.el

;;--------------------------------------------------------------------------------------
;; Enable MELPA
;;--------------------------------------------------------------------------------------

(require 'package)
(let* ((no-ssl (and (memq system-type '(windows-nt ms-dos))
                    (not (gnutls-available-p))))
       (proto (if no-ssl "http" "https")))
  (when no-ssl
    (warn "\
Your version of Emacs does not support SSL connections,
which is unsafe because it allows man-in-the-middle attacks.
There are two things you can do about this warning:
1. Install an Emacs version that does support SSL and be safe.
2. Remove this warning from your init file so you won't see it again."))
  ;; Comment/uncomment these two lines to enable/disable MELPA and MELPA Stable as desired
  (add-to-list 'package-archives (cons "melpa" (concat proto "://melpa.org/packages/")) t)
  ;;(add-to-list 'package-archives (cons "melpa-stable" (concat proto "://stable.melpa.org/packages/")) t)
  (when (< emacs-major-version 24)
    ;; For important compatibility libraries like cl-lib
    (add-to-list 'package-archives (cons "gnu" (concat proto "://elpa.gnu.org/packages/")))))
(package-initialize)

(add-to-list 'package-archives
             '("melpa-stable" . "https://stable.melpa.org/packages/") t)

;; This will force any out of date packages to update automatically
(when (not package-archive-contents)
  (package-refresh-contents))

;; Load the package.el file
(load-file "~/.emacs.d/package.el")

;;--------------------------------------------------------------------------------------
;; Turn off the startup screen
;;--------------------------------------------------------------------------------------

(setq inhibit-startup-screen t)

;;--------------------------------------------------------------------------------------
;; Display battery life in modeline
;;--------------------------------------------------------------------------------------

(display-battery-mode 1)

;;--------------------------------------------------------------------------------------
;; Always follow symbolic links to version controlled files
;;
;; I prefer this option because I generally only get this message when I edit
;; a dotfile under version control, and repeatedly typing "yes" is annoying.
;;--------------------------------------------------------------------------------------

(setq vc-follow-symlinks t)

;;--------------------------------------------------------------------------------------
;; Enable Org-mode and set agenda files
;;--------------------------------------------------------------------------------------

(require 'org)

;; Stuff all of the org files you want under ~/org and they will be loaded automatically
;; and have their TODO items accessible by typing C-c a t
(setq org-agenda-files '("~/org"))
(setq org-log-done t)

;;--------------------------------------------------------------------------------------
;; Prefer unix style line endings
;;--------------------------------------------------------------------------------------

(set-buffer-file-coding-system 'unix)

;;--------------------------------------------------------------------------------------
;; Populate emacs path to $PATH when on *nix or OS X
;;--------------------------------------------------------------------------------------

(when (memq window-system '(mac ns x))
  (exec-path-from-shell-initialize))

;;--------------------------------------------------------------------------------------
;; Enable auto-refresh to keep buffers up to date when git or another program
;; modifies them
;;--------------------------------------------------------------------------------------

(global-auto-revert-mode t)

;;--------------------------------------------------------------------------------------
;; IBuffer configurations (C-x C-b)
;;--------------------------------------------------------------------------------------

(setq ibuffer-saved-filter-groups
      '(("default"
         ("Emacs Configuration" (or (filename . ".emacs.d")
                                    (filename . "init.el")
                                    (filename . "package.el")
                                    (filename . "private.el")
                                    (filename . "emacs.d")))
         ("Org" (or (mode . org-mode)
                    (filename . "OrgMode")))
         ("Magit" (name . "magit"))
         ("Help" (or (name . "\*Help\*")
                     (name . "\*Apropos\*")
                     (name . "\*info\*")))
         ("Dired" (mode . dired-mode))
         ;; Dev has groups for all languages you program in
         ("Dev" (or (mode . cc-mode)
                    (filename . ".c")
                    (filename . ".cpp")
                    (filename . ".hpp")
                    (filename . ".h")
                    (filename . ".java")
		    (filename . ".py")
		    (filename . ".lisp")
                    (filename . ".properties")
                    (filename . ".gradle")
                    (filename . ".am")
                    (mode . yaml-mode))
          )
         ("Text" (or (filename . ".csv")
                     (filename . ".tsv")
                     (filename . ".txt")
                     (filename . ".log")
                     (filename . ".json")))

         ("Emacs" (or (name . "^\\*scratch\\*$")
                      (name . "^\\*Messages\\*$")))
         ("Gnus" (or (mode . message-mode)
                     (mode . bbdb-mode)
                     (mode . mail-mode)
                     (mode . gnus-group-mode)
                     (mode . gnus-summary-mode)
                     (mode . gnus-article-mode)
                     (name . "^\\.bbdb$")
                     (name . "^\\.newsrc-dribble")))
 	 )))

;; Automatically keep buffers up to date and load the filter
(add-hook 'ibuffer-mode-hook
	  '(lambda ()
	     (ibuffer-auto-mode 1)
	     (ibuffer-switch-to-saved-filter-groups "default")))

;; Disable eager line numbering
(add-hook 'ibuffer-mode-hook 'nolinum)

(setq ibuffer-expert t)

(setq ibuffer-show-empty-filter-groups nil)

;;--------------------------------------------------------------------------------------
;; Default modes
;;--------------------------------------------------------------------------------------

(require 'use-package)

(ivy-mode 1)

;; Enable column numbers
(column-number-mode 1)

;; Enable paredit for lisp
(autoload 'enable-paredit-mode "paredit" "Turn on pseudo-structural editing of Lisp code." t)
(add-hook 'emacs-lisp-mode-hook       #'enable-paredit-mode)
(add-hook 'eval-expression-minibuffer-setup-hook #'enable-paredit-mode)
(add-hook 'ielm-mode-hook             #'enable-paredit-mode)
(add-hook 'lisp-mode-hook             #'enable-paredit-mode)
(add-hook 'lisp-interaction-mode-hook #'enable-paredit-mode)
(add-hook 'scheme-mode-hook           #'enable-paredit-mode)

(add-hook 'c-mode-hook 'counsel-gtags-mode)
(add-hook 'c++-mode-hook 'counsel-gtags-mode)

(require 'rainbow-delimiters)

(add-hook 'clojure-mode-hook 'rainbow-delimiters-mode)
(add-hook 'lisp-mode-hook 'rainbow-delimiters-mode)
(add-hook 'scheme-mode-hook 'rainbow-delimiters-mode)
(add-hook 'emacs-lisp-mode-hook 'rainbow-delimiters-mode)

;; Only enable aggressive indent on lisp-likes
(add-hook 'emacs-lisp-mode-hook #'aggressive-indent-mode)
(add-hook 'lisp-mode-hook #'aggressive-indent-mode)
(add-hook 'scheme-mode-hook #'aggressive-indent-mode)
(add-hook 'clojure-mode-hook #'aggressive-indent-mode)

;; Slime - requires SBCL to be installed in /usr/local/bin/ (default for the install.sh
;;         script)

(setq inferior-lisp-program "sbcl")
(setq slime-contribs '(slime-fancy))

;; Enable semantic for language-aware editing commands
(setq semantic-mode 't)


;; Enable company mode
(add-hook 'after-init-hook 'global-company-mode)

;; Globally enable flycheck
(add-hook 'after-init-hook #'global-flycheck-mode)

;;;;; PYTHON ;;;;;;;;;;;;;;;;;;
;;
;; NOTES:
;;
;;   - For each project you will need to install flake8/autopep8 into the virtualenv
;;   - For each project you will need to install jedi into the virtualenv
;;   - To set your pyenv use M-x pyenv-mode and select your local virtualenv
;;
;;

;; thx rakan.me
(defun pyenv-activate-current-project ()
  "Automatically activates pyenv version if .python-version file exists."
  (interactive)
  (f-traverse-upwards
   (lambda (path)
     (message path)
     (let ((pyenv-version-path (f-expand ".python-version" path)))
       (if (f-exists? pyenv-version-path)
	   (let ((pyenv-current-version (s-trim (f-read-text pyenv-version-path 'utf-8))))
	     (pyenv-mode-set pyenv-current-version)
	     (message (concat "Setting virtualenv to " pyenv-current-version))))))))

;; For Python enable Elpy.
(use-package elpy
    :ensure t
    :init (elpy-enable))

(setq elpy-rpc-backend "jedi")

;; Enable pyenv integration.
(use-package pyenv-mode
    :config
  (pyenv-mode))

;; Disable elpy default virtualenv (use the pyenv one)
(setq elpy-rpc-virtualenv-path 'current)

;; Enable autopep8

(require 'py-autopep8)

(add-hook 'elpy-mode-hook 'py-autopep8-enable-on-save)

;; Enable flake8 - requires flake8 in your path so use pyenv/global pip install
(add-hook 'python-mode-hook '(lambda ()
			      (setq flycheck-python-flake8-executable "flake8")
			      (flycheck-select-checker 'python-flake8)
			      (flycheck-mode t)))

;; Activate pyenv automatically if a .python-version is supplied
(add-hook 'python-mode-hook 'pyenv-activate-current-project)

;; Add company-jedi hook to python mode
(add-hook 'python-mode-hook (lambda ()
			      (add-to-list 'company-backends 'company-jedi)))

;;--------------------------------------------------------------------------------------
;; Save hooks
;;--------------------------------------------------------------------------------------

(add-hook 'before-save-hook 'delete-trailing-whitespace)

;; Automagically enable the right pyenv if a .python-version exists
(defun ssbb-pyenv-hook ()
  "Automatically activates pyenv version if .python-version file exists."
  (f-traverse-upwards
   (lambda (path)
     (let ((pyenv-version-path (f-expand ".python-version" path)))
       (if (f-exists? pyenv-version-path)
	   (pyenv-mode-set (s-trim (f-read-text pyenv-version-path 'utf-8))))))))



;;--------------------------------------------------------------------------------------
;; Keybinds
;;--------------------------------------------------------------------------------------

;; <f1> is a mode bind for compile/eval based on language
(global-unset-key (kbd "<f1>"))

(global-unset-key (kbd "<f2>"))

;; Load up swiper search with C-s
(global-set-key "\C-s" 'swiper)

;; Switch windows with M-o
(global-set-key (kbd "M-o") 'other-window)

;; ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Lisp Binds ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

;; Note: SLIME bindings require slime to be running.

;; Press <f1> in lisp mode to evaluate the buffer in SLIME
(define-key lisp-mode-map (kbd "<f1>") 'slime-eval-buffer)

;; Press <f2> in lisp mode to evaluate the current defun in SLIME.
(define-key lisp-mode-map (kbd "<f2>") 'slime-eval-defun)

;; ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


(with-eval-after-load 'counsel-gtags
  (define-key counsel-gtags-mode-map (kbd "M-t") 'counsel-gtags-find-definition)
  (define-key counsel-gtags-mode-map (kbd "M-r") 'counsel-gtags-find-reference)
  (define-key counsel-gtags-mode-map (kbd "M-s") 'counsel-gtags-find-symbol)
  (define-key counsel-gtags-mode-map (kbd "M-,") 'counsel-gtags-go-backward))

;;--------------------------------------------------------------------------------------
;; Install and load Packages
;;--------------------------------------------------------------------------------------

(load-file "~/.emacs.d/package.el")


(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.
 '(lisp-indent-function (quote common-lisp-indent-function))
 '(package-selected-packages
   (quote
    (projectile smex grizzl flycheck-pos-tip flycheck material-theme expand-region wrap-region rainbow-delimiters powerline linum-relative golden-ratio fill-column-indicator autopair exec-path-from-shell ws-butler yaml-mode python-mode protobuf-mode paredit nasm-mode meson-mode markdown-mode magit gradle-mode gitignore-mode feature-mode counsel company-jedi jedi-core company-emacs-eclim company-irony company ag))))

(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.
 )

;; Autoload the indent function
(autoload 'common-lisp-indent-function "cl-indent" "Common Lisp indent.")

;;--------------------------------------------------------------------------------------
;; Theming
;;--------------------------------------------------------------------------------------

(load-theme 'material t)

;;--------------------------------------------------------------------------------------
;; SLIME Quicklisp Integration
;;--------------------------------------------------------------------------------------

(when (file-exists-p "~/quicklisp/slime-helper.el")
  (load (expand-file-name "~/quicklisp/slime-helper.el"))
  (setq inferior-lisp-program "sbcl"))