Game events

world.on_block_break(function(player, pos, block) end) -> connection
world.on_block_place(function(player, pos, block) end) -> connection
--   block is the canonical name: what was there for a break, what was put
--   down for a place
world.on_entity_spawn(function(entity, name) end) -> connection   -- a mob appeared; entity is the handle
world.on_entity_death(function(id, name) end) -> connection    -- a mob died; it is gone, so id and name is all there is
players.on_pickup(function(player, item, count) end) -> connection
players.on_drop(function(player, item, count) end) -> connection

player is nil when:

• the world dropped the stack (a leaf decays, a mob dies, an explosion);
• the player has already left the room.

world.on_block_break(function(player, pos, block)
    if block == "diamond_ore" and player then
        message(player.name .. " struck diamond", colors.cyan)
    end
end)

world.on_entity_spawn fires for mob kinds only. world.on_entity_death fires for mob kinds and for a pack’s living body (physics = "living"). They do not fire for an arrow, an item or another pack kind.

On a mode: lite server, world.spawn of a mob kind fires world.on_entity_spawn. A mob that spawns by itself (its kind has spawn = true) fires it on every game version that has natural spawning (a0.1.4 and later). A spider jockey fires it two times: for the spider, then for its rider.