implement TrampleCrop player handler

server/player/handler.go

@@ -68,6 +68,8 @@ type Handler interface {
 	// HandleBlockPick handles the player picking a specific block at a position in its world. ctx.Cancel()
 	// may be called to cancel the block being picked.
 	HandleBlockPick(ctx *event.Context, pos cube.Pos, b world.Block)
+	// HandleTrampleCrop handles the player trampling a crop.
+	HandleTrampleCrop(ctx *event.Context)
 	// HandleItemUse handles the player using an item in the air. It is called for each item, although most
 	// will not actually do anything. Items such as snowballs may be thrown if HandleItemUse does not cancel
 	// the context using ctx.Cancel(). It is not called if the player is holding no item.
@@ -156,6 +158,7 @@ func (NopHandler) HandleStartBreak(*event.Context, cube.Pos)
 func (NopHandler) HandleBlockBreak(*event.Context, cube.Pos, *[]item.Stack, *int)             {}
 func (NopHandler) HandleBlockPlace(*event.Context, cube.Pos, world.Block)                     {}
 func (NopHandler) HandleBlockPick(*event.Context, cube.Pos, world.Block)                      {}
+func (NopHandler) HandleTrampleCrop(*event.Context)                                           {}
 func (NopHandler) HandleSignEdit(*event.Context, bool, string, string)                        {}
 func (NopHandler) HandleLecternPageTurn(*event.Context, cube.Pos, int, *int)                  {}
 func (NopHandler) HandleItemPickup(*event.Context, *item.Stack)                               {}

server/player/player.go

@@ -542,7 +542,14 @@ func (p *Player) fall(distance float64) {
 		b = w.Block(pos)
 	}
 	if h, ok := b.(block.EntityLander); ok {
-		h.EntityLand(pos, w, p, &distance)
+		if _, ok := b.(block.Farmland); ok {
+			ctx := event.C()
+			if p.Handler().HandleTrampleCrop(ctx); !ctx.Cancelled() {
+				h.EntityLand(pos, w, p, &distance)
+			}
+		} else {
+			h.EntityLand(pos, w, p, &distance)
+		}
 	}
 	dmg := distance - 3
 	if boost, ok := p.Effect(effect.JumpBoost{}); ok {