tracking text

hi,

i want to track text in a file. an example file as below.

--------
simple
jack
-------

now i want to track the text "jack", so i remember it's
position in the file. Now content can be added in the
file anywhere, if new content is added to file after "jack"
there is no problem, but if it is added before "jack", i've
to update the stored position for "jack".

so now the question is how do i keep track of how many
lines are added, deleted etc, is there any au command
to do this. the catch here is i want to update the postion
"jack" once the text is entered, not necessarily after
doing :w

can you guys point me in the right direction to do this.

cheers
sinbad

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