We consider fluids adsorbed at generalised wedges described by shape functions x(gamma) in one direction (x), and translationally invariant in the other. For the limiting cases gamma = 0 and infinity, the substrate corresponds to a planar wall and a capillary slit, respectively. In this way, we show how wetting-like adsorption isotherms become capillary-like as gamma is increased from 0 to infinity. The mechanism for the cross-over to condensation is shown to involve several intermediate regimes corresponding to novel examples of adsorption isotherms.