It looks like ipython is printing invalid (or at least unknown to Emacs)
I got it to ignore them by setting
(setq ansi-color-drop-regexp
"
\\[\\([ABCDsuK]\\|[12][JK]\\|=[0-9]+[hI]\\|[0-9;]*[HfDnC]\\|\\?[0-9]+[hl]\\|J\\)")
There is also a bug in my version of Emacs which causes these eliminated escape
sequences to mess with the use of the start variable in
'ansi-color-filter-apply'. To make a long story short I changed the
implementation to
(defun ansi-color-filter-apply (string)
"Filter out all ANSI control sequences from STRING.
Every call to this function will set and use the buffer-local variable
`ansi-color-context' to save partial escape sequences. This information
will be used for the next call to `ansi-color-apply'. Set
`ansi-color-context' to nil if you don't want this.
This function can be added to `comint-preoutput-filter-functions'."
(let ((start 0) end result)
;; if context was saved and is a string, prepend it
(if (cadr ansi-color-context)
(setq string (concat (cadr ansi-color-context) string)
ansi-color-context nil))
;; eliminate unrecognized escape sequences
(while (string-match ansi-color-drop-regexp string)
(setq string
(replace-match "" nil nil string)))
;; find the next escape sequence
(while (setq end (string-match ansi-color-regexp string start))
(setq result (concat result (substring string start end))
start (match-end 0)))
;; save context, add the remainder of the string to the result
(let (fragment)
(if (string-match "\033" string start)
(let ((pos (match-beginning 0)))
(setq fragment (substring string pos)
result (concat result (substring string start pos))))
(setq result (concat result (substring string start))))
(setq ansi-color-context (if fragment (list nil fragment))))
result))
and it fixed it for me (I swapped the order of the "eliminate unrecognized
escape sequences" and "find the next escape sequence". I have filed a bug on
it.
Let me know if that solves the issue. If so, then maybe we can add a
workaround to sage-mode or figure out how to get ipython to stop sending the
control sequences. If not it would be helpful to know what version of Emacs
you’re running.
-Ivan
> On Aug 11, 2016, at 3:49 PM, 'Martin R' via sage-devel
> <sage-devel@googlegroups.com> wrote:
>
> This is now https://trac.sagemath.org/ticket/21227
>
>
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