Merge branch 'remove' into 'master'

Add `awards.remove(..)` util

See merge request rubenwardy/awards!96

README.md

@@ -197,6 +197,8 @@ end
 	* return true to cancel HUD from appearing.
 * `awards.unlock(player_name, award_name)`
 	* gives an award to a player
+* `awards.remove(player_name, award_name)`
+	* removes an award from a player
 * `awards.get_award_states(player_name)`
 	* Returns list of tables, sorted by `score`, each having the fields:
 

src/api_awards.lua

@@ -183,6 +183,21 @@ function awards.unlock(name, award)
 	end
 end
 
+function awards.remove(name, award)
+	local data  = awards.player(name)
+	local awdef = awards.registered_awards[award]
+	assert(awdef, "Unable to remove an award which doesn't exist!")
+
+	if data.disabled or
+			(not data.unlocked[award]) then
+		return
+	end
+
+	minetest.log("action", "Award " .. award .." has been removed from ".. name)
+	data.unlocked[award] = nil
+	awards.save()
+end
+
 function awards.get_award_states(name)
 	local hash_is_unlocked = {}
 	local retval = {}