Sincronise eshell directory to file

[Lorenzo Isella]

Dear All,
My typical working pattern in emacs is to have an eshell + a buffer
(showing one of the program I intend to modify).
I switch between several of these code buffers and it would be very
useful for me to automatically change directory (within eshell) to the
one corresponding to the file I am visiting though the buffer.
Does anyone know how this can be achieved?
Cheers

Lorenzo