Emacs - <troll>is WAY better than Vi</troll>

• ibuffer is an improved version of buffer-menu with colors.
• Open it with :
  • M-x ibuffer
  • C-x-b
• You then have access to all its commands :
  • 1 : show this buffer in full-frame window (like C-x 1 would)
  • b : bury this line's buffer (i.e. move it to the end of the buffer list)
  • d : mark buffer for deletion (indicated by a leading D)
  • g : update list of buffers
  • o : show this buffer in another window (split window)
  • q : quit
  • S : sort list on the column under the point
  • s : mark buffer for saving (indicated by a leading S)
  • T : toggle display of non-file buffers (*scratch*, *Messages*, magit...., )
  • U : remove all flags from all lines
  • u : unmark (remove all flags) from the current line
  • x : execute flagged deletions and saves
• To make ibuffer the default buffer listing command, add to the configuration file :

  ; make 'ibuffer' replace 'buffer-menu' as the default buffer listing command
  (defalias 'list-buffers 'ibuffer)

buffer

the area where you can read / edit text.
Most of the time : 1 buffer = 1 file, but this is not always true because of specialized buffers : *Completions*, *Messages*, *scratch*, ...

M-any

• M stands for the meta key, which is Alt on PC keyboards
• key1-key2 (with a dash) means : press key2 while maintaining key1 down

point

current cursor position

region

a zone of selected text

** (emacs:3920): WARNING **: Couldn't register with accessibility bus: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken.

export NO_AT_BRIDGE=1

If, for any reason ((non-)?(login|interactive) shell), you prefer not to alter ~/.bashrc, you can apply changes to /etc/bash.bashrc

Some tips / snippets :

• To capture something : \(expression\), and to backreference it : \n (n being the number of the captured expression) (more)
• To insert a [NEWLINE] character in an interactive RegExp search, just hit CTRL-q-j
• To insert a [TAB] character in an interactive RegExp search, just hit CTRL-q TAB
• When they are used to specify a list of characters (e.g. like [0-9]+ to match numbers), the square brackets [ and ] must not be escaped.
• To build / test a RegExp before applying it, use isearch-forward-regexp.

• emacs -r starts Emacs in reverse video mode (not necessary if you've set a custom background color).
• • CTRL-a-b stands for : hold CTRL down, press a then b, release CTRL
  • CTRL-a b stands for : press CTRL then a, release both, then press b
• commands associated with the shortcuts below can be fired with ALT-x command

Custom configuration file

Change the font face

Set the font size

Change colors

Highlighting a region

PHP syntax highlighting

Background color

Indentation width (source) :

Disable the auto-indent feature that appeared with version 24.4 (source) :

(when (fboundp 'electric-indent-mode) (electric-indent-mode -1))

Define a new shortcut key sequence

Settings for Python (Emacs and TAB, Emacs hooks) :

; PYTHON HOOK
(add-hook 'python-mode-hook '(lambda ()
	(setq-default indent-tabs-mode nil)		; no difference "setq default" or "setq-default" 
	(global-set-key (kbd "TAB") 'tab-to-tab-stop)
	(setq tab-stop-list (number-sequence 4 120 4))	; start stop increment. Source : http://www.emacswiki.org/emacs/TabStopList
	)
)

Show the name and path of the current file in the window title bar (source) :

; SHOW CURRENT FILE NAME WITH FULL PATH IN WINDOW TITLE
; source : http://emacs-fu.blogspot.fr/2011/01/setting-frame-title.html
(setq-default
	frame-title-format
	(list '(buffer-file-name "EMACS : %f" (dired-directory
		(revert-buffer-function " %b"
			("%b – Dir: " default-directory)
		)))
	)
)

Remove trailing spaces (source) :

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

Hide the top bars (menu + icons) :

; Hide the "File | Edit | Options | ..." bar
(menu-bar-mode 0)
; Hide the icons bar
(tool-bar-mode 0)

• to open a spell check session, press the meta key (either ESC or ALT) + x then type ispell-buffer
• the spell checker will review all the words contained in the current buffer and will ask for user input when meeting an unknown word:
  • SPACE : leave unknown word unchanged
  • a or A : accept the unknown word for this session only
  • r or R : replace the unknown word
  • [0-9] - [a-z] - [A-Z] : to replace the unknown word with the suggested one
  • i : insert the unknown word into the personal dictionary: ~/.ispell_english
  • x or X : exit spell check session