  $\textbf{HoTCoffeeh}$ ($\textbf{H}$anbury Br$\textbf{o}$wn-$\textbf{T}$wiss
$\textbf{Co}$rrelation $\textbf{f}$unctions and radii $\textbf{f}$rom
$\textbf{e}$vent-by-$\textbf{e}$vent $\textbf{h}$ydrodynamics) is a new
computational tool which determines Hanbury Brown-Twiss (HBT) charged pion
($\pi^+$) correlation functions and radii for event-by-event (EBE)
hydrodynamics with fluctuating initial conditions in terms of Cooper-Frye
integrals, including resonance decay contributions. In this paper, we review
the basic formalism for computing the HBT correlation functions and radii with
resonance decay contributions included, and discuss our implementation of this
formalism in the form of HoTCoffeeh. This tool may be easily integrated with
other numerical packages for the purpose of simulating the evolution of
heavy-ion collisions and thereby extracting predictions for heavy-ion
observables.
