       #'flycheck-pos-tip-error-messages)
 
 (add-hook 'after-init-hook #'global-flycheck-mode)
+
+(setq org-src-tab-acts-natively t)
 
 ;; Prevent inadvertently editing invisible areas in Org.
 (setq org-catch-invisible-edits t)

  (replace-regexp-in-string " " "-" (downcase title)))

(defun ar/string-digits-p (string)
  "Return t if STRING is an unsigned integer. nil otherwise."
  (if (string-match "\\`[[:digit:]]+\\'" string)
      t
    nil))

  (whitespace-mode)
  (rainbow-delimiters-mode)
  (hl-line-mode)
  (rainbow-mode)
  (centered-cursor-mode)
  ;; Language-aware editing commands. Useful for imenu-menu.
  (semantic-mode 1)
