Add simple HUD support

init.lua

@@ -19,23 +19,25 @@ mana.playerlist = {}
 ]===]
 
 -- Sets the maximum mana of the specified player
-function mana.set(playername, mana)
-	mana.playerlist[playerlist].mana = mana
+function mana.set(playername, value) 
+	mana.playerlist[playername].mana = value 
+	mana.hud_update(playername)
 end
 
 -- Sets the maximum mana of the specified player
-function mana.setmax(playername, maxmana)
-	mana.playerlist[playerlist].maxmana = maxmana
+function mana.setmax(playername, value)
+	mana.playerlist[playername].maxmana = value
+	mana.hud_update(playername)
 end
 
 -- Returns the current mana of the specified player
 function mana.get(playername)
-	return mana.playerlist[playerlist].mana
+	return mana.playerlist[playername].mana
 end
 
 -- Returns the maximum mana of the specified player
 function mana.getmax(playername)
-	return mana.playerlist[playerlist].maxmana
+	return mana.playerlist[playername].maxmana
 end
 
 --[[
@@ -47,17 +49,18 @@ returns:
   was no
 - false on failure
 ]]
-function mana.add(playername, mana)
+function mana.add(playername, value)
 	local t = mana.playerlist[playername]
-	if(t ~= nil and mana >= 0) then
+	if(t ~= nil and value >= 0) then
 		local excess
-		if((t.mana + mana) > t.maxmana) then
-			excess = (t.mana + mana) - t.maxmana
+		if((t.mana + value) > t.maxmana) then
+			excess = (t.mana + value) - t.maxmana
 			t.mana = t.maxmana
 		else
 			excess = 0
-			t.mana = t.mana + mana
+			t.mana = t.mana + value
 		end
+		mana.hud_update(playername)
 		return true, excess
 	else
 		return false
@@ -73,10 +76,11 @@ returns:
 - true on success, mana has been subtracted
 - false on failure, no mana has been subtracted
 ]]
-function mana.subtract(playername, mana)
+function mana.subtract(playername, value)
 	local t = mana.playerlist[playername]
-	if(t ~= nil and t.mana >= mana and mana >= 0) then
-		t.mana = t.mana - mana
+	if(t ~= nil and t.mana >= value and value >= 0) then
+		t.mana = t.mana -value 
+		mana.hud_update(playername)
 		return true
 	else
 		return false
@@ -126,11 +130,13 @@ end
 minetest.register_on_dieplayer(function(player)
 	local playername = player:get_player_name()
 	mana.set(playername, 0)
+	mana.hud_update(playername)
 end)
 
 
 minetest.register_on_leaveplayer(function(player)
 	local playername = player:get_player_name()
+	mana.hud_remove(playername)
 	mana.playerlist[playername] = nil
 end)
 
@@ -148,12 +154,42 @@ minetest.register_on_joinplayer(function(player)
 		mana.playerlist[playername].maxmana = 20
 	end
 
-	-- TODO: Update HUD
+	mana.hud_add(playername)
 end)
 
 
 
 --[===[
-	TODO: HUD functions
+	HUD functions
 ]===]
 
+function mana.manastring(playername)
+	return string.format("Mana: %d/%d", mana.get(playername), mana.getmax(playername))
+end
+
+function mana.hud_add(playername)
+	local player = minetest.get_player_by_name(playername)
+	id = player:hud_add({
+		hud_elem_type = "text",
+		position = { x = 1, y=0.3 },
+		name = "mana",
+		text = mana.manastring(playername),
+		scale = { x = 0, y = 0 },
+		alignment = { x = -1, y = 0},
+		direction = 1,
+		number = 0xFFFFFF,
+		offset = { x = 0, y = 0}
+	})
+	mana.playerlist[playername].hudid = id
+	return id
+end
+
+function mana.hud_update(playername)
+	local player = minetest.get_player_by_name(playername)
+	player:hud_change(mana.playerlist[playername].hudid, "text", mana.manastring(playername))
+end
+
+function mana.hud_remove(playername)
+	local player = minetest.get_player_by_name(playername)
+	player:hud_remove(mana.playerlist[playername].hudid)
+end