Move Ruby mode configuration to literate init

emacs/.emacs.d/init.el

@@ -520,14 +520,8 @@ MODE1 is enabled and vice-versa."
 ;; Disable line truncation in ERT results.
 (add-hook 'ert-results-mode-hook 'oni:disable-line-truncation)
 
-(add-hook 'ruby-mode-hook (lambda () (setq-local fci-rule-column 80)))
 (add-hook 'projectile-rails-mode-hook (lambda () (define-key projectile-rails-mode-map (kbd "C-c r") 'hydra-projectile-rails/body)))
 (add-hook 'projectile-mode-hook 'projectile-rails-on)
-(add-hook 'ruby-mode-hook 'yard-mode)
-(add-hook 'ruby-mode-hook 'eldoc-mode)
-(add-hook 'ruby-mode-hook 'ruby-tools-mode)
-(add-hook 'ruby-mode-hook 'ruby-refactor-mode-launch)
-(add-hook 'ruby-mode-hook 'robe-mode)
 (add-hook 'projectile-after-switch-project-hook 'oni:select-corresponding-ruby)
 (add-hook 'prog-mode-hook 'highlight-numbers-mode)
 (add-hook 'compilation-filter-hook 'colorize-compilation-buffer)

emacs/.emacs.d/init.org

@@ -1333,6 +1333,61 @@
      (add-hook 'ruby-mode-hook 'abbrev-mode)
    #+END_SRC
 
+   Turn on [[Electric pair]] mode.
+
+   #+BEGIN_SRC emacs-lisp
+     (add-hook 'ruby-mode-hook #'electric-pair-local-mode)
+   #+END_SRC
+
+   Turn on [[Electric indent]] mode.
+
+   #+BEGIN_SRC emacs-lisp
+     (add-hook 'ruby-mode-hook #'electric-indent-local-mode)
+   #+END_SRC
+
+   Turn on [[Automatic syntax checking on-the-fly][Flycheck]] mode.
+
+   #+BEGIN_SRC emacs-lisp
+     (add-hook 'ruby-mode-hook 'flycheck-mode)
+   #+END_SRC
+
+   Turn on Yard mode.
+
+   #+BEGIN_SRC emacs-lisp
+     (add-hook 'ruby-mode-hook 'yard-mode)
+   #+END_SRC
+
+   Turn on [[Eldoc]] mode.
+
+   #+BEGIN_SRC emacs-lisp
+     (add-hook 'ruby-mode-hook 'eldoc-mode)
+   #+END_SRC
+
+   Turn on Ruby tools mode.
+
+   #+BEGIN_SRC emacs-lisp
+     (add-hook 'ruby-mode-hook 'ruby-tools-mode)
+   #+END_SRC
+
+   Turn on Ruby refactor mode.
+
+   #+BEGIN_SRC emacs-lisp
+     (add-hook 'ruby-mode-hook 'ruby-refactor-mode-launch)
+   #+END_SRC
+
+   Turn on [[Robe]] mode.
+
+   #+BEGIN_SRC emacs-lisp
+     (add-hook 'ruby-mode-hook 'robe-mode)
+   #+END_SRC
+
+   Set Fill Column Indicator column to the community Ruby Style Guide
+   recommended value.
+
+   #+BEGIN_SRC emacs-lisp
+     (add-hook 'ruby-mode-hook 'oni:ruby-set-rsg-margin)
+   #+END_SRC
+
 * Minor mode customization
 
   Many minor modes also offer a bit of customization possibilities.
@@ -1388,7 +1443,6 @@
      (add-hook 'js2-mode-hook #'electric-pair-local-mode)
      (add-hook 'lua-mode-hook #'electric-pair-local-mode)
      (add-hook 'python-mode-hook #'electric-pair-local-mode)
-     (add-hook 'ruby-mode-hook #'electric-pair-local-mode)
      (add-hook 'scss-mode-hook #'electric-pair-local-mode)
      (add-hook 'sh-mode-hook #'electric-pair-local-mode)
    #+END_SRC
@@ -1432,7 +1486,6 @@
      (add-hook 'css-mode-hook #'electric-indent-local-mode)
      (add-hook 'js2-mode-hook #'electric-indent-local-mode)
      (add-hook 'php-mode-hook #'electric-indent-local-mode)
-     (add-hook 'ruby-mode-hook #'electric-indent-local-mode)
      (add-hook 'scss-mode-hook #'electric-indent-local-mode)
      (add-hook 'sh-mode-hook #'electric-indent-local-mode)
    #+END_SRC
@@ -1592,7 +1645,6 @@
      (add-hook 'php-mode-hook 'flycheck-mode)
      (add-hook 'python-mode-hook 'flycheck-mode)
      (add-hook 'rst-mode-hook 'flycheck-mode)
-     (add-hook 'ruby-mode-hook 'flycheck-mode)
      (add-hook 'rust-mode-hook 'flycheck-mode)
      (add-hook 'sh-mode-hook 'flycheck-mode)
      (add-hook 'texinfo-mode-hook 'flycheck-mode)

emacs/.emacs.d/site-lisp/oni-ruby.el

@@ -24,6 +24,7 @@
 
 ;;; Code:
 
+(require 'fill-column-indicator)
 (require 'projectile-rails)
 (require 'rvm)
 
@@ -34,5 +35,10 @@
              (projectile-rails-root))
     (rvm-activate-ruby-for (projectile-rails-root))))
 
+;;;###autoload
+(defun oni:ruby-set-rsg-margin ()
+  "Set the `fci-rule-column' to the Ruby Style Guide recommendation."
+  (setq-local fci-rule-column 80))
+
 (provide 'oni-ruby)
 ;;; oni-ruby.el ends here