"apply-tag": how to change behavior?

[Allin Cottrell <cottrell wfu edu>]

I'm working on a simple built-in editor for my program, using a
GtkTextView.  I'd like to add dynamic syntax highlighting (simple
example: if a line begins with '#' it's a comment and will be shown in
a different color).

I think the functions I want are gtk_text_buffer_apply_tag() and
gtk_text_buffer_remove_tag(), but I don't want the default behavior of
applying a tag to a specified start-end range, rather I want the tag
to apply "from now until further notice" as the user types.

I guess that to achieve this I need to catch the "apply-tag" signal
for the text buffer and customize the response, but I'm having
difficulty figuring out what the response should look like.

Thanks in advance for any suggestions.

-- 
Allin Cottrell
Department of Economics
Wake Forest University, NC