OK. I was hoping zhekov may have been able to help. The relevant function seems to be the following in conterm.c conterm.h . The first arg indicates the context and is presumably responsible for the colour choice, but I don't understand where the actual code is located.
void (*dc_output)(int fd, const char *text, gint length); void (*dc_output_nl)(int fd, const char *text, gint length);
It's marked as extern but I can't see where those are defined or coming from ;?