emacs.d/lisp/setup-editing.el

;; GROUP: Editing -> Editing Basics

(setq global-mark-ring-max 5000         ; increase mark ring to contains 5000 entries
      mark-ring-max 5000                ; increase kill ring to contains 5000 entries
      mode-require-final-newline t      ; add a newline to end of file
      tab-width 4                       ; default to 4 visible spaces to display a tab
      )

(add-hook 'sh-mode-hook (lambda ()
                          (setq tab-width 4)))

(set-terminal-coding-system 'utf-8)
(set-keyboard-coding-system 'utf-8)
(set-language-environment "UTF-8")
(prefer-coding-system 'utf-8)

(setq-default indent-tabs-mode nil)
(delete-selection-mode)
(global-set-key (kbd "RET") 'newline-and-indent)

;; GROUP: Editing -> Killing
(setq kill-ring-max 5000 ; increase kill-ring capacity
      kill-whole-line t  ; if NIL, kill whole line and move the next line up
      )

;; show whitespace in diff-mode
(add-hook 'diff-mode-hook (lambda ()
                            (setq-local whitespace-style
                                        '(face
                                          tabs
                                          tab-mark
                                          spaces
                                          space-mark
                                          trailing
                                          indentation::space
                                          indentation::tab
                                          newline
                                          newline-mark))
                            (whitespace-mode 1)))

;; Package: volatile-highlights
;; GROUP: Editing -> Volatile Highlights
(require-package 'volatile-highlights)
(require 'volatile-highlights)
(volatile-highlights-mode t)

;; Package: clean-aindent-mode
;; GROUP: Editing -> Indent -> Clean Aindent
(require-package 'clean-aindent-mode)
(require 'clean-aindent-mode)
(add-hook 'prog-mode-hook 'clean-aindent-mode)


;; PACKAGE: dtrt-indent
(require-package 'dtrt-indent)
(require 'dtrt-indent)
(dtrt-indent-mode 1)
(setq dtrt-indent-verbosity 0)

;; PACKAGE: ws-butler
(require-package 'ws-butler)
(require 'ws-butler)
(add-hook 'c-mode-common-hook 'ws-butler-mode)
(add-hook 'text-mode 'ws-butler-mode)
(add-hook 'fundamental-mode 'ws-butler-mode)

;; Package: undo-tree
;; GROUP: Editing -> Undo -> Undo Tree
(require-package 'undo-tree)
(require 'undo-tree)
(global-undo-tree-mode)

;; Package: yasnippet
;; GROUP: Editing -> Yasnippet
(require-package 'yasnippet)
(require 'yasnippet)
(yas-global-mode 1)
(require-package 'yasnippet-snippets)

(show-smartparens-global-mode +1)
(smartparens-global-mode 1)

;; PACKAGE: comment-dwim-2
(global-set-key (kbd "M-;") 'comment-dwim-2)

;; Jump to end of snippet definition
(define-key yas-keymap (kbd "<return>") 'yas/exit-all-snippets)

;; Inter-field navigation
(defun yas/goto-end-of-active-field ()
  (interactive)
  (let* ((snippet (car (yas--snippets-at-point)))
         (position (yas--field-end (yas--snippet-active-field snippet))))
    (if (= (point) position)
        (move-end-of-line 1)
      (goto-char position))))

(defun yas/goto-start-of-active-field ()
  (interactive)
  (let* ((snippet (car (yas--snippets-at-point)))
         (position (yas--field-start (yas--snippet-active-field snippet))))
    (if (= (point) position)
        (move-beginning-of-line 1)
      (goto-char position))))

(define-key yas-keymap (kbd "C-e") 'yas/goto-end-of-active-field)
(define-key yas-keymap (kbd "C-a") 'yas/goto-start-of-active-field)
;; (define-key yas-minor-mode-map [(tab)] nil)
;; (define-key yas-minor-mode-map (kbd "TAB") nil)
;; (define-key yas-minor-mode-map (kbd "C-<tab>") 'yas-expand)
;; No dropdowns please, yas
(setq yas-prompt-functions '(yas/ido-prompt yas/completing-prompt))

;; No need to be so verbose
(setq yas-verbosity 1)

;; Wrap around region
(setq yas-wrap-around-region t)

(add-hook 'term-mode-hook (lambda() (setq yas-dont-activate t)))

;; PACKAGE: anzu
;; GROUP: Editing -> Matching -> Isearch -> Anzu
(require-package 'anzu)
(require 'anzu)
(global-anzu-mode)
(global-set-key (kbd "M-%") 'anzu-query-replace)
(global-set-key (kbd "C-M-%") 'anzu-query-replace-regexp)

;; PACKAGE: iedit
(setq iedit-toggle-key-default nil)
(require-package 'iedit)
(require 'iedit)
(global-set-key (kbd "C-;") 'iedit-mode)

;; PACKAGE: duplicate-thing
(require-package 'duplicate-thing)
(require 'duplicate-thing)
(global-set-key (kbd "M-c") 'duplicate-thing)

;; Customized functions
(defun prelude-move-beginning-of-line (arg)
  "Move point back to indentation of beginning of line.

Move point to the first non-whitespace character on this line.
If point is already there, move to the beginning of the line.
Effectively toggle between the first non-whitespace character and
the beginning of the line.

If ARG is not nil or 1, move forward ARG - 1 lines first. If
point reaches the beginning or end of the buffer, stop there."
  (interactive "^p")
  (setq arg (or arg 1))

  ;; Move lines first
  (when (/= arg 1)
    (let ((line-move-visual nil))
      (forward-line (1- arg))))

  (let ((orig-point (point)))
    (back-to-indentation)
    (when (= orig-point (point))
      (move-beginning-of-line 1))))

;(global-set-key (kbd "C-a") 'prelude-move-beginning-of-line)

(defadvice kill-ring-save (before slick-copy activate compile)
  "When called interactively with no active region, copy a single
line instead."
  (interactive
   (if mark-active (list (region-beginning) (region-end))
     (message "Copied line")
     (list (line-beginning-position)
           (line-beginning-position 2)))))

(defadvice kill-region (before slick-cut activate compile)
  "When called interactively with no active region, kill a single
  line instead."
  (interactive
   (if mark-active (list (region-beginning) (region-end))
     (list (line-beginning-position)
           (line-beginning-position 2)))))

;; kill a line, including whitespace characters until next non-whiepsace character
;; of next line
(defadvice kill-line (before check-position activate)
  (if (member major-mode
              '(emacs-lisp-mode scheme-mode lisp-mode
                                c-mode c++-mode objc-mode
                                latex-mode plain-tex-mode))
      (if (and (eolp) (not (bolp)))
          (progn (forward-char 1)
                 (just-one-space 0)
                 (backward-char 1)))))

;; taken from prelude-editor.el
;; automatically indenting yanked text if in programming-modes
(defvar yank-indent-modes
  '(LaTeX-mode TeX-mode)
  "Modes in which to indent regions that are yanked (or yank-popped).
Only modes that don't derive from `prog-mode' should be listed here.")

(defvar yank-indent-blacklisted-modes
  '(python-mode slim-mode haml-mode)
  "Modes for which auto-indenting is suppressed.")

(defvar yank-advised-indent-threshold 1000
  "Threshold (# chars) over which indentation does not automatically occur.")

(defun yank-advised-indent-function (beg end)
  "Do indentation, as long as the region isn't too large."
  (if (<= (- end beg) yank-advised-indent-threshold)
      (indent-region beg end nil)))

(defadvice yank (after yank-indent activate)
  "If current mode is one of 'yank-indent-modes,
indent yanked text (with prefix arg don't indent)."
  (if (and (not (ad-get-arg 0))
           (not (member major-mode yank-indent-blacklisted-modes))
           (or (derived-mode-p 'prog-mode)
               (member major-mode yank-indent-modes)))
      (let ((transient-mark-mode nil))
        (yank-advised-indent-function (region-beginning) (region-end)))))

(defadvice yank-pop (after yank-pop-indent activate)
  "If current mode is one of `yank-indent-modes',
indent yanked text (with prefix arg don't indent)."
  (when (and (not (ad-get-arg 0))
             (not (member major-mode yank-indent-blacklisted-modes))
             (or (derived-mode-p 'prog-mode)
                 (member major-mode yank-indent-modes)))
    (let ((transient-mark-mode nil))
      (yank-advised-indent-function (region-beginning) (region-end)))))

;; prelude-core.el
(defun indent-buffer ()
  "Indent the currently visited buffer."
  (interactive)
  (indent-region (point-min) (point-max)))

;; prelude-editing.el
(defcustom prelude-indent-sensitive-modes
  '(coffee-mode python-mode slim-mode haml-mode yaml-mode)
  "Modes for which auto-indenting is suppressed."
  :type 'list)

(defun indent-region-or-buffer ()
  "Indent a region if selected, otherwise the whole buffer."
  (interactive)
  (unless (member major-mode prelude-indent-sensitive-modes)
    (save-excursion
      (if (region-active-p)
          (progn
            (indent-region (region-beginning) (region-end))
            (message "Indented selected region."))
        (progn
          (indent-buffer)
          (message "Indented buffer.")))
      (whitespace-cleanup))))

(global-set-key (kbd "C-c i") 'indent-region-or-buffer)

;; add duplicate line function from Prelude
;; taken from prelude-core.el
(defun prelude-get-positions-of-line-or-region ()
  "Return positions (beg . end) of the current line
or region."
  (let (beg end)
    (if (and mark-active (> (point) (mark)))
        (exchange-point-and-mark))
    (setq beg (line-beginning-position))
    (if mark-active
        (exchange-point-and-mark))
    (setq end (line-end-position))
    (cons beg end)))

;; smart openline
(defun prelude-smart-open-line (arg)
  "Insert an empty line after the current line.
Position the cursor at its beginning, according to the current mode.
With a prefix ARG open line above the current line."
  (interactive "P")
  (if arg
      (prelude-smart-open-line-above)
    (progn
      (move-end-of-line nil)
      (newline-and-indent))))

(defun prelude-smart-open-line-above ()
  "Insert an empty line above the current line.
Position the cursor at it's beginning, according to the current mode."
  (interactive)
  (move-beginning-of-line nil)
  (newline-and-indent)
  (forward-line -1)
  (indent-according-to-mode))

(global-set-key (kbd "M-o") 'prelude-smart-open-line)
(global-set-key (kbd "M-o") 'open-line)

(provide 'setup-editing)