EDIT: I'm having some success with `unbuffer -p arc diff | perl -pe 's/\e\[?.*?[\@-~]//g'` (part of `expect`) but interactive prompts are not flushing the line correctly in acme's win
I managed to silence arc by aliasing my arc command to be = `arc --no-ansi COMMAND`
See http://no-color.org for more.
I'm happily not using arc for work anymore.
Do you know if there is a simple wrapper that swallows ansi escapes but yet preserves the illusion the output is a tty (so that the wrapped command doesn't freak out?)