Emacs: Color Nested Brackets

rainbow-delimiters-mode colors nested brackets with different color.

rainbow-delimiters-mode by Jeremy L Rayman at https://github.com/Fanael/rainbow-delimiters. It's in MELPA 〔see Emacs: Install Package with ELPA/MELPA〕.

Alt+x rainbow-delimiters-mode to turn on for current buffer.

To turn on for all programing modes, put the following in your emac init:

(require 'rainbow-delimiters)
(add-hook 'prog-mode-hook 'rainbow-delimiters-mode)

It colors brackets by their nesting level. By default, most brackets are colored gray. You can customize it like this:

Setting up colors, with every third parenthesis red.

(custom-set-faces
 ;; custom-set-faces was added by Custom.
 ;; If you edit it by hand, you could mess it up, so be careful.
 ;; Your init file should contain only one such instance.
 ;; If there is more than one, they won't work right.

 '(rainbow-delimiters-depth-1-face ((t (:foreground "red"))))
 '(rainbow-delimiters-depth-2-face ((t (:foreground "black"))))
 '(rainbow-delimiters-depth-3-face ((t (:foreground "black"))))
 '(rainbow-delimiters-depth-4-face ((t (:foreground "red"))))
 '(rainbow-delimiters-depth-5-face ((t (:foreground "black"))))
 '(rainbow-delimiters-depth-6-face ((t (:foreground "black"))))
 '(rainbow-delimiters-depth-7-face ((t (:foreground "red"))))
 '(rainbow-delimiters-depth-8-face ((t (:foreground "black"))))
 '(rainbow-delimiters-depth-9-face ((t (:foreground "black"))))
 '(rainbow-delimiters-unmatched-face ((t (:background "cyan"))))

 )

Decreasing Bracket Size

rainbow-delimiters-mode setup, with decreasing bracket size:

;; rainbow-delimiters-mode setup, with decreasing bracket size
(custom-set-faces
 ;; custom-set-faces was added by Custom.
 ;; If you edit it by hand, you could mess it up, so be careful.
 ;; Your init file should contain only one such instance.
 ;; If there is more than one, they won't work right.

 '(rainbow-delimiters-depth-1-face ((t (:foreground "red" :height 2.0))))
 '(rainbow-delimiters-depth-2-face ((t (:foreground "orange" :height 1.8))))
 '(rainbow-delimiters-depth-3-face ((t (:foreground "yellow" :height 1.6))))
 '(rainbow-delimiters-depth-4-face ((t (:foreground "green" :height 1.4))))
 '(rainbow-delimiters-depth-5-face ((t (:foreground "blue" :height 1.2))))
 '(rainbow-delimiters-depth-6-face ((t (:foreground "violet" :height 1.1))))
 '(rainbow-delimiters-depth-7-face ((t (:foreground "purple" :height 1.0))))
 '(rainbow-delimiters-depth-8-face ((t (:foreground "black" :height 0.9))))
 '(rainbow-delimiters-unmatched-face ((t (:background "cyan" :height 0.8))))

 )