Looking for a special type of editor

[Kent West <westk@acu.edu>]

A sysadmin friend of mine asks the following:

Anyone ever heard of an application that does the following...

You know how some text editors will number the lines?
Well I need an editor that will add a time stamp at the beginning of each 
line.

I can certainly see why a normal editor might have problems with this, but 
do ya'll know of any application (for *nix) that does anything similar? 
Kinda like a .history file. 

I am beta testing an application, and I need an easy way of recording (and 
timestamping) everything I do.  Any ideas?

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Thanks,

Kent