Install TEX/LATEX in Mac OS X

1. Install MacTex based on Texlive.
Download MacTex from here.
or you can also install from MacPorts.

sudo port install texlive
sudo port install texlive-latex-extra

You can see the list of  texlive ports here. Around 99% of the packages are included in texlive-latex-extra.

2. Use Emacs as an editor.

You can down emacs for mac from here.
or install from macports:
sudo port install emacs-app +fullscreen

If you want to use emacs to edit tex file, you have to install auctex or aquamacs.
For installing aquamacs, you can see here.

I am using auctex.

2.1 Download auctex from here.

2.2 Install

./configure --with-emacs=/Applications/Emacs.app/Contents/MacOS/Emacs --with-lispdir=/Applications/Emacs.app/Contents/Resources/site-lisp --with-texmf-dir=/usr/local/texlive/texmf-local

instead this by: (if you used macports)
./configure --with-emacs=/Applications/MacPorts/Emacs.app/Contents/MacOS/Emacs --with-lispdir=/Applications/MacPorts/Emacs.app/Contents/Resources/site-lisp --with-texmf-dir=/usr/local/texlive/texmf-local


in OS X 10.11, if u installed the texlive via macports, the texmf-local location is changed to
/opt/local/share/texmf-local

make

sudo make install

Before do this, maybe you have to install make

go to Xcode Preferences, install Command Line Tools in Downloads.

2.3 load auctex

edit your ~/.emacs

put following in.

(setenv "PATH" (concat "/usr/texbin:/usr/local/bin:" (getenv "PATH")))

(setq exec-path (append '("/usr/texbin" "/usr/local/bin") exec-path))

(load "auctex.el" nil t t)

(load "preview-latex.el" nil t t)

P.S.
If you want to swap CTRL and CAPS LOCK

Go into System Preferences, Enter the Keyboard & Mouse preference pane, In the Keyboard tab, click Modifier Keys... Swap the actions for Caps Lock and Control.

If you want to use option as META

In the menu bar, click Terminal, Click Preferences... Under the Settings tab, go to the Keyboard tab, Check the box labeled Use option as meta key.