Use callbacks for items, monsters and status effects

Previously, global function names were defined in the respective XML
definitions of items, monsters and status effects. This was reasonable when
they all had the same state, but now they're sharing the single global
Lua state.

Now the Lua API provides access to the ItemClass, MonsterClass and
StatusEffect instances, on which callbacks for both standard and custom
events can be explicitly set.

Reviewed-by: Erik Schilling

7 files changed, 22 insertions, 9 deletions

diff --git a/example/items.xml b/example/items.xml
index 730e5729..cdbc3e44 100644
--- a/example/items.xml
+++ b/example/items.xml
@@ -68,7 +68,7 @@
         max-per-slot="30"
         value="15">
         <effect trigger="activation">
-            <script src="candy.lua" function="use_candy" />
+            <scriptevent activate="use" />
             <consumes />
         </effect>
     </item>
diff --git a/example/monsters.xml b/example/monsters.xml
index f0361915..962b137e 100644
--- a/example/monsters.xml
+++ b/example/monsters.xml
@@ -78,7 +78,7 @@ exp<TAG>:                 Tells how much experience point a monster is giving up
             damage-factor="1"
             range="32"
             animation="attack"
-            script-function="on_maggot_strike"
+            script-event="strike"
             />
             <script>testmonster.lua</script> <!-- only Proof of Concept-->
     </monster>
diff --git a/example/scripts/items/candy.lua b/example/scripts/items/candy.lua
index a9c59fe4..f60e687d 100644
--- a/example/scripts/items/candy.lua
+++ b/example/scripts/items/candy.lua
@@ -2,12 +2,14 @@
 
  Example item script.
 
- Makes the player character say "*munch*munch*munch*" when using this item.
+ Makes the player character say "*munch*munch*munch*" when using a candy.
  The HP regeneration effect is handled separately based on the heal value in
  items.xml.
 
 --]]
 
-function use_candy(user)
+local candy = mana.get_item_class("candy")
+
+candy:on("use", function(user)
     mana.being_say(user, "*munch*munch*munch*")
-end
+end)
diff --git a/example/scripts/main.lua b/example/scripts/main.lua
index aeaca63b..6d8207e7 100644
--- a/example/scripts/main.lua
+++ b/example/scripts/main.lua
@@ -9,3 +9,6 @@
 require "scripts/global_events"
 require "scripts/special_actions"
 require "scripts/crafting"
+
+require "scripts/items/candy"
+require "scripts/monster/testmonster"
diff --git a/example/scripts/monster/testmonster.lua b/example/scripts/monster/testmonster.lua
index 2701d24e..63b29179 100644
--- a/example/scripts/monster/testmonster.lua
+++ b/example/scripts/monster/testmonster.lua
@@ -7,14 +7,14 @@
 
 --]]
 
-function update_monster(mob)
+local function update(mob)
     local r = math.random(0, 200);
     if r == 0 then
         mana.being_say(mob, "Roar! I am a boss")
     end
 end
 
-function on_maggot_strike(mob, victim, hit)
+local function strike(mob, victim, hit)
     if hit > 0 then
         mana.being_say(mob, "Take this! "..hit.." damage!")
         mana.being_say(victim, "Oh Noez!")
@@ -23,3 +23,7 @@ function on_maggot_strike(mob, victim, hit)
         mana.being_say(victim, "Whew...")
     end
 end
+
+local maggot = mana.get_monster_class("maggot")
+maggot:on_update(update)
+maggot:on("strike", strike)
diff --git a/example/scripts/status/jump.lua b/example/scripts/status/jump.lua
index 10ad9288..166c90d1 100644
--- a/example/scripts/status/jump.lua
+++ b/example/scripts/status/jump.lua
@@ -12,7 +12,7 @@
 ----------------------------------------------------------------------------------
 
 
-function tick_jump(target, ticknumber)
+local function tick(target, ticknumber)
     if (ticknumber % 10 == 0) then
         mana.being_say(target, "I have the jumping bug!")
     end
@@ -51,3 +51,5 @@ function tick_jump(target, ticknumber)
     mana.being_apply_status(victim, 2, 6000)
     mana.being_say(victim, "Now I have the jumping bug")
 end
+
+mana.get_status_effect("jumping status"):on_tick(tick)
diff --git a/example/scripts/status/plague.lua b/example/scripts/status/plague.lua
index 5f33eb87..a43b9d40 100644
--- a/example/scripts/status/plague.lua
+++ b/example/scripts/status/plague.lua
@@ -12,7 +12,7 @@
 --  Software Foundation; either version 2 of the License, or any later version. --
 ----------------------------------------------------------------------------------
 
-function tick_plague(target, ticknumber)
+local function tick(target, ticknumber)
     if (ticknumber % 10 == 0) then
         mana.being_say(target, "I have the plague! :( = " .. ticknumber)
     end
@@ -26,3 +26,5 @@ function tick_plague(target, ticknumber)
        i = i + 1
     end
 end
+
+mana.get_status_effect("plague"):on_tick(tick)