event thingy

2 files changed, 35 insertions, 0 deletions

diff --git a/mods/vzxv/event.lua b/mods/vzxv/event.lua
new file mode 100644
index 0000000..a7a0b7c
--- /dev/null
+++ b/mods/vzxv/event.lua
@@ -0,0 +1,33 @@
+
+vzxv.event = {}
+
+function vzxv.event.create()
+	local e = {}
+	setmetatable(e, vzxv.event)
+	return e
+end
+
+function vzxv.event:register(func)
+	self[func] = true
+end
+
+function vzxv.event:unregister(func)
+	self[func] = nil
+end
+
+function vzxv.event:trigger(...)
+	local v
+	for f in pairs(self) do
+		v = {f(...)}
+	end
+	return table.unpack(v)
+end
+
+-- iterate through all of the event handlers' results
+function vzxv.event:trigger_each(...)
+	local p = pairs(self)
+	return function()
+		local f = p()
+		if f then return f(...) end
+	end
+end
diff --git a/mods/vzxv/utils.lua b/mods/vzxv/utils.lua
index c9a376e..9067afe 100644
--- a/mods/vzxv/utils.lua
+++ b/mods/vzxv/utils.lua
@@ -1,4 +1,6 @@
 
+vzxv.include "event.lua"
+
 function vzxv.mundane_block(name,visualname,tiles,settings)
 	settings = settings or {}
 	settings.description = visualname