I am using following code to apply colorize text in emacs, such as for ^[ characters to apply color. In order to use this code I have to select text to apply it

reference: https://unix.stackexchange.com/a/19505/198423

(defun ansi-color-apply-on-region-int (beg end)
  "interactive version of func"
  (interactive "r")
  (ansi-color-apply-on-region beg end))

How can I automatically apply it for the complete buffer? Is there any alternative solution to use it as a mode something like ansi-color-mode?

1 Answer 1


If that function does what you want on the region then this should do what you want on the entire buffer:

(ansi-color-apply-on-region-int (point-min) (point-max))

If you want to do it interactively then C-x h followed by M-x ansi-color-apply-on-region-int.

Or use this command:

(defun ansi-color-on-buffer ()
  (ansi-color-apply-on-region (point-min) (point-max)))

If the buffer is narrowed, that acts on the visible portion. If you instead want to act on the full buffer, even if it's narrowed, then change (point-min) to 1 and (point-max) to (buffer-size).

If you want a minor mode:

(define-minor-mode ansi-color-mode 
  nil nil nil
  (ansi-color-apply-on-region 1 (buffer-size)))

Replace the "..." occurrences with doc strings that say what each function does. See the Elisp manual, node Function Documentation for info about writing doc strings for functions.

  • Can "..." remain or should I replace it with some other valid string?
    – alper
    Dec 30, 2021 at 0:21
  • Yes, replace it with a doc string that describes what the minor mode does - what it's for. I updated the answer with some info about writing doc strings.
    – Drew
    Dec 30, 2021 at 5:03
  • would it be possible to change themes for the ansi-color-mode, such as can I apply github.com/dracula/emacs ? I can ask different question since it is not related
    – alper
    Dec 30, 2021 at 18:53
  • Please ask a different question for that. (And I have no idea about that. Hopefully someone else will be able to help.)
    – Drew
    Dec 30, 2021 at 20:44

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