From e110bbbc7a8dea47b9ed536fcd31dc21169c6bd6 Mon Sep 17 00:00:00 2001
From: rubenwardy <rw@rubenwardy.com>
Date: Thu, 5 Apr 2018 17:00:41 +0100
Subject: Add award unlock requirements

Fixes #52
---
 api.lua | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

(limited to 'api.lua')

diff --git a/api.lua b/api.lua
index 39f7f09..1cf05f9 100644
--- a/api.lua
+++ b/api.lua
@@ -296,6 +296,19 @@ function awards.register_achievement(name, def)
 		tdef:on_register(def)
 	end
 
+	function def:can_unlock(data)
+		if not self.requires then
+			return true
+		end
+
+		for i=1, #self.requires do
+			if not data.unlocked[self.requires[i]] then
+				return false
+			end
+		end
+		return true
+	end
+
 	-- Add Award
 	awards.registered_awards[name] = def
 
@@ -341,6 +354,12 @@ function awards.unlock(name, award)
 		return
 	end
 
+	if not awdef:can_unlock(data) then
+		minetest.log("warning", "can_unlock returned false in unlock of " ..
+				award .. " for " .. name)
+		return
+	end
+
 	-- Unlock Award
 	minetest.log("action", name.." has unlocked award "..name)
 	data.unlocked[award] = award
-- 
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