Hi Ricardo,
> As a first change, could you please add the relevant parts of “(ice-9
> colorized)” to a module in Guix?  We probably don’t want to depend on
> having users install this module separately.  We also don’t need all of
> it.  Please prepare a patch that adds only the relevant parts to “(guix
> ui)” and update the copyright headers.

I think small changes to the attached file will serve the purpose.
But when I tried executing the file, that resulted with a error unbound variable : colorize string 

I am not sure where I went wrong, can you please explain.

--Sahithi