funcs.el

;;; funcs.el --- Spacemacs Base Layer functions File
;;
;; Copyright (c) 2012-2014 Sylvain Benner
;; Copyright (c) 2014-2015 Sylvain Benner & Contributors
;;
;; Author: Sylvain Benner <sylvain.benner@gmail.com>
;; URL: https://github.com/syl20bnr/spacemacs
;;
;; This file is not part of GNU Emacs.
;;
;;; License: GPLv3

;; add emacs binary helper functions
(defun spacemacs/emacsbin-path ()
  (interactive)
  (concat exec-directory (if (spacemacs/system-is-mswindows) "bin/") "emacs"))

(defun spacemacs/emacs-start ()
  (interactive)
  (call-process (spacemacs/emacsbin-path) nil 0 nil)
  (message "Started 'emacs' - it will be ready soon ..."))

(defun spacemacs/emacs-debug-init ()
  (interactive)
  (call-process (spacemacs/emacsbin-path) nil 0 nil "--debug-init")
  (message "Started 'emacs --debug-init' - it will be ready soon ..."))

(defun spacemacs/emacs-reload ()
  (interactive)
  (load-file user-init-file)
  (message ".emacs reloaded successfully"))

(defun spacemacs/emacs-Q ()
  (interactive)
  (call-process (spacemacs/emacsbin-path) nil 0 nil "-Q")
  (message "Started 'emacs -Q' - it will be ready soon ..."))

;; from https://github.com/cofi/dotfiles/blob/master/emacs.d/config/cofi-util.el#L38
(defun spacemacs/add-to-hooks (fun hooks)
  "Add function to hooks"
  (dolist (hook hooks)
    (add-hook hook fun)))

(defun spacemacs/add-all-to-hook (hook &rest funs)
  "Add functions to hook."
  (spacemacs/add-to-hook hook funs))

(defun spacemacs/add-to-hook (hook funs)
  "Add list of functions to hook."
  (dolist (fun funs)
    (add-hook hook fun)))

(defun spacemacs/echo (msg &rest args)
  "Display MSG in echo-area without logging it in *Messages* buffer."
  (interactive)
  (let ((message-log-max nil))
    (apply 'message msg args)))

(defun spacemacs/system-is-mac ()
  (eq system-type 'darwin))
(defun spacemacs/system-is-linux ()
  (eq system-type 'gnu/linux))
(defun spacemacs/system-is-mswindows ()
  (eq system-type 'windows-nt))

(defun spacemacs/jump-in-buffer ()
  (interactive)
  (cond
   ((eq major-mode 'org-mode)
    (call-interactively 'helm-org-in-buffer-headings))
   (t
    (call-interactively 'helm-semantic-or-imenu))))

(defun spacemacs/split-and-new-line ()
  "Split a quoted string or s-expression and insert a new line with
auto-indent."
  (interactive)
  (sp-split-sexp 1)
  (sp-newline))

(defun spacemacs/push-mark-and-goto-beginning-of-line ()
  "Push a mark at current location and go to the beginnign of the line."
  (interactive)
  (push-mark (point))
  (evil-beginning-of-line))

(defun spacemacs/push-mark-and-goto-end-of-line ()
  "Push a mark at current location and go to the end of the line."
  (interactive)
  (push-mark (point))
  (evil-end-of-line))

;; insert one or several line below without changing current evil state
(defun spacemacs/evil-insert-line-below (count)
  "Insert one of several lines below the current point's line without changing
the current state and point position."
  (interactive "p")
  (save-excursion
    (evil-save-state (evil-open-below count))))

;; insert one or several line above without changing current evil state
(defun spacemacs/evil-insert-line-above (count)
  "Insert one of several lines above the current point's line without changing
the current state and point position."
  (interactive "p")
  (save-excursion
    (evil-save-state (evil-open-above count))))

(defun spacemacs/evil-goto-next-line-and-indent (&optional count)
  (interactive "p")
  (let ((counter (or count 1)))
    (while (> counter 0)
      (join-line 1)
      (newline-and-indent)
      (setq counter (1- counter)))))

;; from Prelude
;; TODO: dispatch these in the layers
(defvar spacemacs-indent-sensitive-modes
  '(coffee-mode
    python-mode
    slim-mode
    haml-mode
    yaml-mode
    makefile-mode
    makefile-gmake-mode
    makefile-imake-mode
    makefile-bsdmake-mode)
  "Modes for which auto-indenting is suppressed.")

(defcustom spacemacs-yank-indent-threshold 1000
  "Threshold (# chars) over which indentation does not automatically occur."
  :type 'number
  :group 'spacemacs)

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

;; idea from http://www.reddit.com/r/emacs/comments/312ge1/i_created_this_function_because_i_was_tired_of/
(defun spacemacs/eval-current-form ()
  "Looks for the current def* or set* command then evaluates, unlike `eval-defun', does not go to topmost function"
  (interactive)
  (save-excursion
    (search-backward-regexp "(def\\|(set")
    (forward-list)
    (call-interactively 'eval-last-sexp)))

;; from magnars
(defun spacemacs/eval-and-replace ()
  "Replace the preceding sexp with its value."
  (interactive)
  (backward-kill-sexp)
  (condition-case nil
      (prin1 (eval (read (current-kill 0)))
             (current-buffer))
    (error (message "Invalid expression")
           (insert (current-kill 0)))))

;; from https://gist.github.com/3402786
(defun spacemacs/toggle-maximize-buffer ()
  "Maximize buffer"
  (interactive)
  (if (and (= 1 (length (window-list)))
           (assoc'_ register-alist))
      (jump-to-register '_)
    (progn
      (window-configuration-to-register '_)
      (delete-other-windows))))

;; A small minor mode to use a big fringe
;; from http://bzg.fr/emacs-strip-tease.html
(defvar bzg-big-fringe-mode nil)
(define-minor-mode bzg-big-fringe-mode
  "Minor mode to use big fringe in the current buffer."
  :init-value nil
  :global t
  :variable bzg-big-fringe-mode
  :group 'editing-basics
  (if (not bzg-big-fringe-mode)
      (set-fringe-style nil)
    (set-fringe-mode
     (/ (- (frame-pixel-width)
           (* 100 (frame-char-width)))
        2))))

(defun spacemacs/toggle-maximize-centered-buffer ()
  "Maximize buffer and center it on the screen"
  (interactive)
  (if (= 1 (length (window-list)))
      (progn  (bzg-big-fringe-mode 0)
              (jump-to-register '_))
    (progn
      (set-register '_ (list (current-window-configuration)))
      (delete-other-windows)
      (bzg-big-fringe-mode 1))))

(defun spacemacs/useless-buffer-p (buffer)
  "Determines if a buffer is useful."
  (let ((buf-paren-major-mode (get (with-current-buffer buffer
                                     major-mode)
                                   'derived-mode-parent))
        (buf-name (buffer-name buffer)))
    ;; first find if useful buffer exists, if so returns nil and don't check for
    ;; useless buffers. If no useful buffer is found, check for useless buffers.
    (unless (cl-loop for regexp in spacemacs-useful-buffers-regexp do
                     (when (or (eq buf-paren-major-mode 'comint-mode)
                               (string-match regexp buf-name))
                       (return t)))
      (cl-loop for regexp in spacemacs-useless-buffers-regexp do
               (when (string-match regexp buf-name)
                 (return t))))))

;; from magnars modified by ffevotte for dedicated windows support
(defun spacemacs/rotate-windows (count)
  "Rotate your windows.
Dedicated windows are left untouched. Giving a negative prefix
argument takes the kindows rotate backwards."
  (interactive "p")
  (let* ((non-dedicated-windows (remove-if 'window-dedicated-p (window-list)))
         (num-windows (length non-dedicated-windows))
         (i 0)
         (step (+ num-windows count)))
    (cond ((not (> num-windows 1))
           (message "You can't rotate a single window!"))
          (t
           (dotimes (counter (- num-windows 1))
             (let* ((next-i (% (+ step i) num-windows))

                    (w1 (elt non-dedicated-windows i))
                    (w2 (elt non-dedicated-windows next-i))

                    (b1 (window-buffer w1))
                    (b2 (window-buffer w2))

                    (s1 (window-start w1))
                    (s2 (window-start w2)))
               (set-window-buffer w1 b2)
               (set-window-buffer w2 b1)
               (set-window-start w1 s2)
               (set-window-start w2 s1)
               (setq i next-i)))))))

(defun spacemacs/rotate-windows-backward (count)
  "Rotate your windows backward."
  (interactive "p")
  (spacemacs/rotate-windows (* -1 count)))

(defun spacemacs/next-useful-buffer ()
  "Switch to the next buffer and avoid special buffers."
  (interactive)
  (let ((start-buffer (current-buffer)))
    (next-buffer)
    (while (and (spacemacs/useless-buffer-p (current-buffer))
                (not (eq (current-buffer) start-buffer)))
      (next-buffer))))

(defun spacemacs/previous-useful-buffer ()
  "Switch to the previous buffer and avoid special buffers."
  (interactive)
  (let ((start-buffer (current-buffer)))
    (previous-buffer)
    (while (and (spacemacs/useless-buffer-p (current-buffer))
                (not (eq (current-buffer) start-buffer)))
      (previous-buffer))))

;; from magnars
(defun spacemacs/rename-current-buffer-file ()
  "Renames current buffer and file it is visiting."
  (interactive)
  (let ((name (buffer-name))
        (filename (buffer-file-name)))
    (if (not (and filename (file-exists-p filename)))
        (error "Buffer '%s' is not visiting a file!" name)
      (let ((new-name (read-file-name "New name: " filename)))
        (cond ((get-buffer new-name)
               (error "A buffer named '%s' already exists!" new-name))
              (t
               (let ((dir (file-name-directory new-name)))
                 (when (and (not (file-exists-p dir)) (yes-or-no-p (format "Create directory '%s'?" dir)))
                   (make-directory dir t)))
               (rename-file filename new-name 1)
               (rename-buffer new-name)
               (set-visited-file-name new-name)
               (set-buffer-modified-p nil)
               (message "File '%s' successfully renamed to '%s'" name (file-name-nondirectory new-name))))))))

;; from magnars
(defun spacemacs/delete-current-buffer-file ()
  "Removes file connected to current buffer and kills buffer."
  (interactive)
  (let ((filename (buffer-file-name))
        (buffer (current-buffer))
        (name (buffer-name)))
    (if (not (and filename (file-exists-p filename)))
        (ido-kill-buffer)
      (when (yes-or-no-p "Are you sure you want to delete this file? ")
        (delete-file filename t)
        (kill-buffer buffer)
        (message "File '%s' successfully removed" filename)))))

;; from magnars
(defun spacemacs/sudo-edit (&optional arg)
  (interactive "p")
  (let ((fname (if (or arg (not buffer-file-name)) (read-file-name "File: ") buffer-file-name)))
    (find-file
     (cond ((string-match-p "^/ssh:" fname)
            (with-temp-buffer
              (insert fname)
              (search-backward ":")
              (let ((last-match-end nil)
                    (last-ssh-hostname nil))
                (while (string-match "@\\\([^:|]+\\\)" fname last-match-end)
                  (setq last-ssh-hostname (or (match-string 1 fname) last-ssh-hostname))
                  (setq last-match-end (match-end 0)))
                (insert (format "|sudo:%s" (or last-ssh-hostname "localhost"))))
              (buffer-string)))
           (t (concat "/sudo:root@localhost:" fname))))))

;; found at http://emacswiki.org/emacs/KillingBuffers
(defun spacemacs/kill-other-buffers ()
  "Kill all other buffers."
  (interactive)
  (when (yes-or-no-p (format "Killing all buffers except \"%s\"? " (buffer-name)))
    (mapc 'kill-buffer (delq (current-buffer) (buffer-list)))
    (message "Buffers deleted!")))

;; from http://dfan.org/blog/2009/02/19/emacs-dedicated-windows/
(defun spacemacs/toggle-current-window-dedication ()
  "Toggle dedication state of a window."
 (interactive)
 (let* ((window    (selected-window))
        (dedicated (window-dedicated-p window)))
   (set-window-dedicated-p window (not dedicated))
   (message "Window %sdedicated to %s"
            (if dedicated "no longer " "")
            (buffer-name))))

;; http://camdez.com/blog/2013/11/14/emacs-show-buffer-file-name/
(defun spacemacs/show-and-copy-buffer-filename ()
  "Show the full path to the current file in the minibuffer."
  (interactive)
  (let ((file-name (buffer-file-name)))
    (if file-name
        (progn
          (message file-name)
          (kill-new file-name))
      (error "Buffer not visiting a file"))))

;; adapted from bozhidar
;; http://emacsredux.com/blog/2013/05/18/instant-access-to-init-dot-el/
(defun spacemacs/find-user-init-file ()
  "Edit the `user-init-file', in the current window."
  (interactive)
  (find-file-existing user-init-file))

(defun spacemacs/find-dotfile ()
  "Edit the `dotfile', in the current window."
  (interactive)
  (find-file-existing (dotspacemacs/location)))

(defun spacemacs/ediff-dotfile-and-template ()
  "ediff the current `dotfile' with the template"
  (interactive)
  (ediff-files (dotspacemacs/location)
               (concat dotspacemacs-template-directory ".spacemacs.template")))

(defun spacemacs/new-empty-buffer ()
  "Create a new buffer called untitled(<n>)"
  (interactive)
  (let ((newbuf (generate-new-buffer-name "untitled")))
    (switch-to-buffer newbuf)))

;; from https://gist.github.com/timcharper/493269
(defun spacemacs/split-window-vertically-and-switch ()
  (interactive)
  (split-window-vertically)
  (other-window 1))

(defun spacemacs/split-window-horizontally-and-switch ()
  (interactive)
  (split-window-horizontally)
  (other-window 1))

(defun spacemacs/layout-triple-columns ()
  " Set the layout to triple columns. "
  (interactive)
  (delete-other-windows)
  (dotimes (i 2) (split-window-right))
  (balance-windows))

(defun spacemacs/layout-double-columns ()
  " Set the layout to double columns. "
  (interactive)
  (delete-other-windows)
  (split-window-right))

(defalias 'spacemacs/home 'spacemacs-buffer/goto-buffer
  "Go to home Spacemacs buffer")

(defun spacemacs/insert-line-above-no-indent (count)
  (interactive "p")
  (let ((p (+ (point) count)))
    (save-excursion
       (if (eq (line-number-at-pos) 1)
          (evil-move-beginning-of-line)
        (progn
          (evil-previous-line)
          (evil-move-end-of-line)))
      (while (> count 0)
        (insert "\n")
        (setq count (1- count))))
    (goto-char p)))

(defun spacemacs/insert-line-below-no-indent (count)
  "Insert a new line below with no identation."
  (interactive "p")
  (save-excursion
    (evil-move-end-of-line)
    (while (> count 0)
      (insert "\n")
      (setq count (1- count)))))

;; from https://github.com/gempesaw/dotemacs/blob/emacs/dg-defun.el
(defun spacemacs/kill-matching-buffers-rudely (regexp &optional internal-too)
  "Kill buffers whose name matches the specified REGEXP. This
function, unlike the built-in `kill-matching-buffers` does so
WITHOUT ASKING. The optional second argument indicates whether to
kill internal buffers too."
  (interactive "sKill buffers matching this regular expression: \nP")
  (dolist (buffer (buffer-list))
    (let ((name (buffer-name buffer)))
      (when (and name (not (string-equal name ""))
                 (or internal-too (/= (aref name 0) ?\s))
                 (string-match regexp name))
        (kill-buffer buffer)))))

;; advise to prevent server from closing

(defvar spacemacs-really-kill-emacs nil
  "prevent window manager close from closing instance.")

(defun spacemacs/persistent-server-running-p ()
  "Requires spacemacs-really-kill-emacs to be toggled and
dotspacemacs-persistent-server to be t"
  (and (fboundp 'server-running-p)
       (server-running-p)
       dotspacemacs-persistent-server))

(defadvice kill-emacs (around spacemacs-really-exit activate)
  "Only kill emacs if a prefix is set"
  (if (and (not spacemacs-really-kill-emacs)
           (spacemacs/persistent-server-running-p))
      (spacemacs/frame-killer)
    ad-do-it))

(defadvice save-buffers-kill-emacs (around spacemacs-really-exit activate)
  "Only kill emacs if a prefix is set"
  (if (or spacemacs-really-kill-emacs (not dotspacemacs-persistent-server))
      ad-do-it
    (spacemacs/frame-killer)))

(defun spacemacs/save-buffers-kill-emacs ()
  "Save all changed buffers and exit Spacemacs"
  (interactive)
  (setq spacemacs-really-kill-emacs t)
  (save-buffers-kill-emacs))

(defun spacemacs/kill-emacs ()
  "Lose all changes and exit Spacemacs"
  (interactive)
  (setq spacemacs-really-kill-emacs t)
  (kill-emacs))

(defun spacemacs/prompt-kill-emacs ()
  "Prompt to save changed buffers and exit Spacemacs"
  (interactive)
  (setq spacemacs-really-kill-emacs t)
  (save-some-buffers)
  (kill-emacs))

(defun spacemacs/frame-killer ()
  "Kill server buffer and hide the main Emacs window"
  (interactive)
  (condition-case nil
      (delete-frame nil 1)
      (error
       (make-frame-invisible nil 1))))

(defun spacemacs/toggle-frame-fullscreen ()
  "Respect the `dotspacemacs-fullscreen-use-non-native' variable when
toggling fullscreen."
  (interactive)
  (if dotspacemacs-fullscreen-use-non-native
      (spacemacs/toggle-frame-fullscreen-non-native)
    (toggle-frame-fullscreen)))

(defun spacemacs/toggle-fullscreen ()
  "Toggle full screen on X11 and Carbon"
  (interactive)
  (cond
   ((eq window-system 'x)
    (set-frame-parameter nil 'fullscreen
                         (when (not (frame-parameter nil 'fullscreen))
                           'fullboth)))
   ((eq window-system 'mac)
    (set-frame-parameter
     nil 'fullscreen
     (when (not (frame-parameter nil 'fullscreen)) 'fullscreen)))))

(defun spacemacs/toggle-frame-fullscreen-non-native ()
  "Toggle full screen non-natively. Uses the `fullboth' frame paramerter
   rather than `fullscreen'. Useful to fullscreen on OSX w/o animations."
  (interactive)
  (modify-frame-parameters
   nil
   `((maximized
      . ,(unless (memq (frame-parameter nil 'fullscreen) '(fullscreen fullboth))
	   (frame-parameter nil 'fullscreen)))
     (fullscreen
      . ,(if (memq (frame-parameter nil 'fullscreen) '(fullscreen fullboth))
	     (if (eq (frame-parameter nil 'maximized) 'maximized)
		 'maximized)
	   'fullboth)))))

;; taken from Prelude: https://github.com/bbatsov/prelude
(defmacro spacemacs|advise-commands (advice-name commands class &rest body)
  "Apply advice named ADVICE-NAME to multiple COMMANDS.
The body of the advice is in BODY."
  `(progn
     ,@(mapcar (lambda (command)
                 `(defadvice ,command
                      (,class ,(intern (format "%S-%s" command advice-name))
                              activate)
                    ,@body))
               commands)))

(defun spacemacs/safe-revert-buffer ()
  "Prompt before reverting the file."
  (interactive)
  (revert-buffer nil nil))

(defun spacemacs/safe-erase-buffer ()
  "Prompt before erasing the content of the file."
  (interactive)
  (if (y-or-n-p (format "Erase content of buffer %s ? " (current-buffer)))
      (erase-buffer)))

(defun spacemacs/ert-run-tests-buffer ()
  "Run all the tests in the current buffer."
  (interactive)
  (save-buffer)
  (load-file (buffer-file-name))
  (ert t))

(defun spacemacs/alternate-buffer ()
  "Switch back and forth between current and last buffer in the
current window."
  (interactive)
  (if (evil-alternate-buffer)
      (switch-to-buffer (car (evil-alternate-buffer)))
    (switch-to-buffer (other-buffer (current-buffer) t))))

(defun current-line ()
  "Return the line at point as a string."
  (buffer-substring (line-beginning-position) (line-end-position)))

(defun spacemacs/open-in-external-app ()
  "Open current file in external application."
  (interactive)
  (let ((file-path (if (eq major-mode 'dired-mode)
                       (dired-get-file-for-visit)
                     (buffer-file-name))))
    (if file-path
        (cond
         ((spacemacs/system-is-mswindows) (w32-shell-execute "open" (replace-regexp-in-string "/" "\\\\" file-path)))
         ((spacemacs/system-is-mac) (shell-command (format "open \"%s\"" file-path)))
         ((spacemacs/system-is-linux) (let ((process-connection-type nil))
                              (start-process "" nil "xdg-open" file-path))))
      (message "No file associated to this buffer."))))

(defun spacemacs/next-error (&optional n reset)
  "Dispatch to flycheck or standard emacs error."
  (interactive "P")
  (if (and (boundp 'flycheck-mode)
           (symbol-value flycheck-mode))
      (call-interactively 'flycheck-next-error)
    (call-interactively 'next-error)))

(defun spacemacs/previous-error (&optional n reset)
  "Dispatch to flycheck or standard emacs error."
  (interactive "P")
  (if (and (boundp 'flycheck-mode)
           (symbol-value flycheck-mode))
      (call-interactively 'flycheck-previous-error)
    (call-interactively 'previous-error)))

(defun spacemacs/switch-to-minibuffer-window ()
  "switch to minibuffer window (if active)"
  (interactive)
  (when (active-minibuffer-window)
    (select-window (active-minibuffer-window))))

(defun spacemacs/comint-clear-buffer ()
  (interactive)
  (let ((comint-buffer-maximum-size 0))
    (comint-truncate-buffer)))

;; http://stackoverflow.com/a/10216338/4869
(defun spacemacs/copy-whole-buffer-to-clipboard ()
  "Copy entire buffer to clipboard"
  (interactive)
  (clipboard-kill-ring-save (point-min) (point-max)))

(defun spacemacs/copy-clipboard-to-whole-buffer ()
  "Copy clipboard and replace buffer"
  (interactive)
  (delete-region (point-min) (point-max))
  (clipboard-yank)
  (deactivate-mark))

;; BEGIN align functions

;; modified function from http://emacswiki.org/emacs/AlignCommands
(defun spacemacs/align-repeat (start end regexp &optional justify-right after)
  "Repeat alignment with respect to the given regular expression.
If JUSTIFY-RIGHT is non nil justify to the right instead of the
left. If AFTER is non-nil, add whitespace to the left instead of
the right."
  (interactive "r\nsAlign regexp: ")
  (let ((complete-regexp (if after
                             (concat regexp "\\([ \t]*\\)")
                           (concat "\\([ \t]*\\)" regexp)))
        (group (if justify-right -1 1)))
    (align-regexp start end complete-regexp group 1 t)))

;; Modified answer from http://emacs.stackexchange.com/questions/47/align-vertical-columns-of-numbers-on-the-decimal-point
(defun spacemacs/align-repeat-decimal (start end)
  "Align a table of numbers on decimal points and dollar signs (both optional)"
  (interactive "r")
  (require 'align)
  (align-region start end nil
                '((nil (regexp . "\\([\t ]*\\)\\$?\\([\t ]+[0-9]+\\)\\.?")
                       (repeat . t)
                       (group 1 2)
                       (spacing 1 1)
                       (justify nil t)))
                nil))

(defmacro spacemacs|create-align-repeat-x (name regexp &optional justify-right default-after)
  (let ((new-func (intern (concat "spacemacs/align-repeat-" name))))
    `(defun ,new-func (start end switch)
       (interactive "r\nP")
       (let ((after (not (eq (if switch t nil) (if ,default-after t nil)))))
         (spacemacs/align-repeat start end ,regexp ,justify-right after)))))

(spacemacs|create-align-repeat-x "comma" "," nil t)
(spacemacs|create-align-repeat-x "semicolon" ";" nil t)
(spacemacs|create-align-repeat-x "colon" ":" nil t)
(spacemacs|create-align-repeat-x "equal" "=")
(spacemacs|create-align-repeat-x "math-oper" "[+\\-*/]")
(spacemacs|create-align-repeat-x "ampersand" "&")
(spacemacs|create-align-repeat-x "bar" "|")
(spacemacs|create-align-repeat-x "left-paren" "(")
(spacemacs|create-align-repeat-x "right-paren" ")" t)

;; END align functions

(defun spacemacs/dos2unix ()
  "Converts the current buffer to UNIX file format."
  (interactive)
  (set-buffer-file-coding-system 'undecided-unix nil))

(defun spacemacs/unix2dos ()
  "Converts the current buffer to DOS file format."
  (interactive)
  (set-buffer-file-coding-system 'undecided-dos nil))

(defun spacemacs/copy-file ()
  "Write the file under new name."
  (interactive)
  (call-interactively 'write-file))

(defun spacemacs//imagep (object)
  "Tests whether the given object is an image (a list whose
first element is the symbol `image')."
  (and (listp object)
       object
       (eq 'image (car object))))

(defun spacemacs/uniquify-lines ()
  "Remove duplicate adjacent lines in region or current buffer"
  (interactive)
  (save-excursion
    (save-restriction
      (let ((beg (if (region-active-p) (region-beginning) (point-min)))
            (end (if (region-active-p) (region-end) (point-max))))
        (goto-char beg)
        (while (re-search-forward "^\\(.*\n\\)\\1+" end t)
          (replace-match "\\1"))))))

(defun spacemacs/sort-lines ()
  "Sort lines in region or current buffer"
  (interactive)
  (let ((beg (if (region-active-p) (region-beginning) (point-min)))
        (end (if (region-active-p) (region-end) (point-max))))
    (sort-lines nil beg end)))

;; BEGIN linum mouse helpers

(defvar spacemacs-linum-mdown-line nil
  "Define persistent variable for linum selection")

(defun spacemacs/line-at-click ()
  "Determine the visual line at click"
  (save-excursion
    (let ((click-y (cddr (mouse-position)))
          (debug-on-error t)
          (line-move-visual t))
      (goto-char (window-start))
      (next-line (1- click-y))
      (1+ (line-number-at-pos))
      )))

(defun spacemacs/md-select-linum (event)
  "Set point as spacemacs-linum-mdown-line"
  (interactive "e")
  (mouse-select-window event)
  (goto-line (spacemacs/line-at-click))
  (set-mark (point))
  (setq spacemacs-linum-mdown-line
        (line-number-at-pos)))

(defun spacemacs/mu-select-linum ()
  "Select code block between point and spacemacs-linum-mdown-line"
  (interactive)
  (when spacemacs-linum-mdown-line
    (let (mu-line)
      (setq mu-line (spacemacs/line-at-click))
      (goto-line (max spacemacs-linum-mdown-line mu-line))
      (set-mark (line-end-position))
      (goto-line (min spacemacs-linum-mdown-line mu-line))
      (setq spacemacs-linum-mdown-line nil))))

(defun spacemacs/select-current-block ()
  "Select the current block of text between blank lines."
  (interactive)
  (let (p1 p2)
    (progn
      (if (re-search-backward "\n[ \t]*\n" nil "move")
          (progn (re-search-forward "\n[ \t]*\n")
                 (setq p1 (point)))
        (setq p1 (point)))
      (if (re-search-forward "\n[ \t]*\n" nil "move")
          (progn (re-search-backward "\n[ \t]*\n")
                 (setq p2 (point)))
        (setq p2 (point))))
    (set-mark p1)))

;; END linum mouse helpers

;; From http://xugx2007.blogspot.ca/2007/06/benjamin-rutts-emacs-c-development-tips.html
(setq compilation-finish-function
      (lambda (buf str)

        (if (or (string-match "exited abnormally" str)
                (string-match "FAILED" (buffer-string)))

            ;; there were errors
            (message "There were errors. SPC-e-n to visit.")
          (unless (or (string-match "Grep finished" (buffer-string))
                      (string-match "Ag finished" (buffer-string))
                      (string-match "nosetests" (buffer-name)))

            ;; no errors
            (message "compilation ok.")))))

;; from http://www.emacswiki.org/emacs/WordCount
(defun spacemacs/count-words-analysis (start end)
  "Count how many times each word is used in the region.
 Punctuation is ignored."
  (interactive "r")
  (let (words alist_words_compare (formated ""))
    (save-excursion
      (goto-char start)
      (while (re-search-forward "\\w+" end t)
        (let* ((word (intern (match-string 0)))
               (cell (assq word words)))
          (if cell
              (setcdr cell (1+ (cdr cell)))
            (setq words (cons (cons word 1) words))))))
    (defun alist_words_compare (a b)
      "Compare elements from an associative list of words count.
Compare them on count first,and in case of tie sort them alphabetically."
      (let ((a_key (car a))
            (a_val (cdr a))
            (b_key (car b))
            (b_val (cdr b)))
        (if (eq a_val b_val)
            (string-lessp a_key b_key)
          (> a_val b_val))))
    (setq words (cl-sort words 'alist_words_compare))
    (while words
      (let* ((word (pop words))
             (name (car word))
             (count (cdr word)))
        (setq formated (concat formated (format "[%s: %d], " name count)))))
    (when (interactive-p)
      (if (> (length formated) 2)
          (message (substring formated 0 -2))
        (message "No words.")))
    words))

;; indent on paste
;; from Prelude: https://github.com/bbatsov/prelude
(defun spacemacs/yank-advised-indent-function (beg end)
  "Do indentation, as long as the region isn't too large."
  (if (<= (- end beg) spacemacs-yank-indent-threshold)
      (indent-region beg end nil)))

(spacemacs|advise-commands
 "indent" (yank yank-pop evil-paste-before evil-paste-after) around
 "If current mode is not one of spacemacs-indent-sensitive-modes
 indent yanked text (with universal arg don't indent)."
 (evil-start-undo-step)
 ad-do-it
 (if (and (not (equal '(4) (ad-get-arg 0)))
          (not (member major-mode spacemacs-indent-sensitive-modes))
          (or (derived-mode-p 'prog-mode)
              (member major-mode spacemacs-indent-sensitive-modes)))
     (let ((transient-mark-mode nil)
           (save-undo buffer-undo-list))
       (spacemacs/yank-advised-indent-function (region-beginning)
                                               (region-end))))
 (evil-end-undo-step))

(defun spacemacs//intersperse (seq separator)
  "Returns a list with `SEPARATOR' added between each element
of the list `SEQ'."
  (cond
   ((not seq) nil)
   ((not (cdr seq)) seq)
   (t (append (list (car seq) separator)
              (spacemacs//intersperse (cdr seq) separator)))))

(defun spacemacs//mode-line-nonempty (seg)
  "Checks whether a modeline segment (classical Emacs style)
is nonempty."
  (let ((val (format-mode-line seg)))
    (cond ((listp val) val)
          ((stringp val) (< 0 (length val)))
          (t))))

(defun spacemacs/switch-to-scratch-buffer ()
  "Switch to the `*scratch*' buffer. Create it first if needed."
  (interactive)
  (switch-to-buffer (get-buffer-create "*scratch*")))

;; http://stackoverflow.com/questions/11847547/emacs-regexp-count-occurrences
(defun how-many-str (regexp str)
  (loop with start = 0
        for count from 0
        while (string-match regexp str start)
        do (setq start (match-end 0))
        finally return count))

(defun spacemacs/close-compilation-window ()
  "Close the window containing the '*compilation*' buffer."
  (interactive)
  (delete-windows-on "*compilation*"))

(defun spacemacs//set-evil-shift-width ()
  "Set the value of `evil-shift-width' based on the indentation settings of the
current major mode."
  (let ((shift-width
         (catch 'break
           (dolist (test spacemacs--indent-variable-alist)
             (let ((mode (car test))
                   (val (cdr test)))
               (when (or (and (symbolp mode) (derived-mode-p mode))
                         (and (listp mode) (apply 'derived-mode-p mode))
                         (eq 't mode))
                 (when (not (listp val))
                   (setq val (list val)))
                 (dolist (v val)
                   (cond
                    ((integerp v) (throw 'break v))
                    ((and (symbolp v) (boundp v))
                     (throw 'break (symbol-value v))))))))
           (throw 'break (default-value 'evil-shift-width)))))
    (when (and (integerp shift-width)
               (< 0 shift-width))
      (setq-local evil-shift-width shift-width))))