Installing packages

  Install a package from MELPA/ELPA (useful for installing language modes)

  M-x package-install package-name

multiple-cursors

- install with melpa
- allows editing of groups of lines at once
- load multiple-cursors-mode in a buffer
- highlight something and add via M-x mc/mark-next-like-this
- edit
- C-g (possibly twice) to end

  These weird bindings are to work around terminal breakage
  
  C-S-c C-S-c       mc/edit-lines
  C-]               mc/mark-next-like-this
  C-c C-]           mc/mark-previous-like-this
  C-c C-c C-]       mc/mark-all-like-this

Code Folding

  use hide/show minor mode (hs-minor-mode)
  M-x hs-minor-mode

  add the minor mode to all programming modes
  (add-hook 'prog-mode-hook #'hs-minor-mode)

  C-c h
  C-c h C-s   show
  C-c h C-h   hide
  C-c h M-s   show all
  C-c h M-h   hide all
  C-c h C-C   toggle

Window Splitting and Buffers

  C-x b     switch to buffer, enter for default
  C-x C-b   list buffers

  C-x 1     delete other window  (or C-x 0)
  C-x 2     split window horizontal
  C-x 3     split window vertical
  C-x o     switch window

goto an offset in the file

  M-g M-g       goto-line
  M-g c         goto-char
  C-x 7         display-line-numbers-mode, custom binding

  M-x display-line-numbers-mode   toggles left column line numbers
  

eval a lisp expression in the current buffer and print the value in the minibuffer

  M-:

  M-: major-mode

force a mode on a file, put at end of text

  // Local Variables:
  // mode: c++
  // End:

register commands

  point-to-register: C-x r SPC
  register-to-point: C-x j <register id>
  copy-to-register:  C-x r x
  insert-register:   C-x r g
  view-register: -

highlight or remove useless whitespace

(setq-default trailing-whitespace t)

  To turn off whitespace-mode for specific modes
  
(add-hook 'term-mode-hook (lambda () (setq show-trailing-whitespace nil)))

Added the following key bindings:

  C-x 8    toggle whitespace-mode, custom binding
  C-x 9    toggle show-trailing-whitespace, custom binding

  To remove tailing whitespace in a buffer, type
  M-x delete-trailing-whitespace
  M-x whitespace-mode will turn on and off highlighting of all whitespace

.emacs file

;; this is for shells that set either delete or backspace
;; as ctrl h use M-x help to get to help instead
(global-set-key "\C-h" 'backward-delete-char)
;; set the tab width slightly smaller
(setq default-tab-width 4)
(setq-default tab-width 4)
(setq-default c-basic-offset 4)

;; do not display a splash screen on startup for emacs 22
(setq inhibit-splash-screen t)

;; turn off menu bar in terminal
(if (not window-system)
    (menu-bar-mode -1))

;; don't use tabs to indent, may or may not want this
;; to insert a tab C-q
(setq-default indent-tabs-mode nil)

;; show trailing whitespace and add some keybindings
(setq-default show-trailing-whitespace t)
(global-set-key (kbd "C-x 7") 'display-line-numbers-mode)
(global-set-key (kbd "C-x 8") 'whitespace-mode)
(global-set-key (kbd "C-x 9") '(lambda () (interactive)
                                 (setq show-trailing-whitespace (not show-trailing-whitespace))
                                 (force-mode-line-update)
                                 (cond (show-trailing-whitespace (message "show-trailing-whitespace is True"))
                                       (t    (message "show-trailing-whitespace is False")))))

;; make sure octave files are opened in octave mode and not obj-c mode
(add-to-list 'auto-mode-alist '("\\.m\\'" . octave-mode))

;; add code folding hs-minor-mode to all programming modes
(add-hook 'prog-mode-hook #'hs-minor-mode)
;; if you want line numbers on the lefthand side of programming modes
;;(add-hook 'prog-mode-hook 'display-line-numbers-mode)


;; https://github.com/magnars/multiple-cursors.el/blob/master/README.md
;; many terminals do not do not send C-> or C-. due to the term emulation
;; xterm does (along with C-S-c, 'S' is shift)
;; the weird bindings here are to get around terminal breakage
(require 'multiple-cursors)
(global-set-key (kbd "C-S-c C-S-c") 'mc/edit-lines)
(global-set-key (kbd "C-]") 'mc/mark-next-like-this)
(global-set-key (kbd "C-c C-]") 'mc/mark-previous-like-this)
(global-set-key (kbd "C-c C-c C-]") 'mc/mark-all-like-this)


;; remap the prefix for the hide/show to something easier
(setq hs-minor-mode-map
      (let ((map (make-sparse-keymap)))
        ;; These bindings roughly imitate those used by Outline mode.
        (define-key map (kbd "C-c h C-h") 'hs-hide-block)
        (define-key map (kbd "C-c h C-s") 'hs-show-block)
        (define-key map (kbd "C-c h M-h") 'hs-hide-all)
        (define-key map (kbd "C-c h M-s") 'hs-show-all)
        (define-key map (kbd "C-c h C-l") 'hs-hide-level)
        (define-key map (kbd "C-c h C-c") 'hs-toggle-hiding)
        (define-key map [(shift mouse-3)] 'hs-toggle-hiding)
        map))

;; python stuff
(add-hook 'python-mode-hook
          (lambda ()
            (setq indent-tabs-mode nil)
            (setq tab-width 4)
            (setq python-indent 4)
            ))

tramp: allows you to edit files remotely through ssh as well as other methods. you can just open a file using the normal scp path syntax.

fill-paragraph

M-q is 'fill-paragraph' reflows text to justify it

turn off color

emacs --color=no

(global-font-lock-mode -1)

(set-face-attribute face nil :foreground nil :background nil)

M-x customize-themes to choose a color theme (includes dark themes). Consider fxn/monochrome-theme.el

Desktop Emacs Keybindings

under gnome 3

gsettings set org.gnome.desktop.interface gtk-key-theme "Emacs"

under xfce

xfconf-query -c xsettings -p /Gtk/KeyThemeName -s Emacs

may need to add --create --type string to above