My Emacs initialization file

init.el

(require 'package)
(add-to-list 'package-archives
             '("marmalade" . "http://marmalade-repo.org/packages/") t)
(package-initialize)

(when (not package-archive-contents)
  (package-refresh-contents))

(defvar my-packages '(starter-kit
                      starter-kit-lisp
                      starter-kit-bindings
                      starter-kit-eshell
                      starter-kit-js
                      clojure-mode
                      rainbow-delimiters
                      auctex
                      regex-tool
                      markdown-mode
                      js2-mode
                      flymake-jshint)
  "A list of packages to ensure are installed at launch.")

(dolist (p my-packages)
  (when (not (package-installed-p p))
    (package-install p)))

;; Changed key mappings
(define-key global-map (kbd "RET") 'newline-and-indent)

;; Cosmetic changes
(global-rainbow-delimiters-mode)
(set-face-attribute 'default nil :height 100) ;10 pt font

;; Set js2-mode to be default
(autoload 'js2-mode "js2" nil t)
(add-to-list 'auto-mode-alist '("\\.js$" . js2-mode))

;; Customizations for LaTeX
(setq TeX-auto-save t)
(setq TeX-parse-self t)
(setq-default TeX-master nil)

(add-hook 'LaTeX-mode-hook 'visual-line-mode)
(add-hook 'LaTeX-mode-hook 'flyspell-mode)
(add-hook 'LaTeX-mode-hook 'LaTeX-math-mode)

(add-hook 'LaTeX-mode-hook 'turn-on-reftex)
(setq reftex-plug-into-AUCTeX t)

(setq TeX-PDF-mode t) ;By default compile to PDF