How do I display ANSI color codes in emacs for any mode?

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You could use code below

(require 'ansi-color)
(defun display-ansi-colors ()
  (interactive)
  (ansi-color-apply-on-region (point-min) (point-max)))

Then you can execute display-ansi-colors via M-x, via a key-binding of your choosing, or via some programmatic condition (maybe your log files have a extension or name that matches some regexp)

If you want to do this with read-only buffers (log files, grep results), you may use inhibit-read-only, so the function will be:

(defun display-ansi-colors ()
  (interactive)
  (let ((inhibit-read-only t))
    (ansi-color-apply-on-region (point-min) (point-max))))

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