Add copper, and the beginnings of a machine system.

mods/rgt_achievements/init.lua

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+local ns = rgt
+
+local achievements = {}
+ns.achievements = achievements
+local root_achievements = {}
+
+function ns.register_achievement(def)
+    if not def.label then
+        def.label = def.name:gsub("_", " "):gsub("%s%a", function(a) return " "..string.upper(a) end)
+    end
+    if not def.depends then
+        table.insert(root_achievements, def.name)
+        def.depends = {}
+    end
+    achievements[def.name] = def
+end
+
+minetest.register_on_mods_loaded(function()
+    table.sort(root_achievements)
+    for id, def in pairs(achievements) do
+        for _, dep in ipairs(def.depends) do
+            local d_def = achievements[dep]
+            if not d_def.children then d_def.children = {} end
+            if d_def then
+                table.insert(d_def.children, id)
+            else
+                minetest.log("error", "[rgt_achievements] Missing dependency '"..dep.."' for '"..id.."'")
+            end
+        end
+    end
+end)
+
+
+
+function ns.show_achievements(name)
+    local fs = [[
+        formspec_version[10]
+        size[12.5,10.5]
+        scroll_container[0.25,0.25;12,11;blah;horizontal;;]
+        scroll_container[0.25,0.25;12,10;blah2;vertical;;]
+    ]]
+    
+    for i, x in ipairs(root_achievements) do
+        fs = fs.."image[0,"..(i *0.5)..";0.25,0.25;rgt_stone.png]"
+    end
+        
+    fs = fs..[[
+        scroll_container_end[]
+        scroll_container_end[]
+        scrollbaroptions[min=0;max=256]
+        scrollbar[0,0;-800,0;horizontal;blah;]
+        scrollbar[0,0;-800,0;vertical;blah2;]
+    ]]
+    
+    minetest.show_formspec(name, "achievements", fs)
+end
+
+
+
+ns.register_achievement {
+    name = "survival",
+}
+
+ns.register_achievement {
+    name = "machines",
+}
+
+minetest.register_chatcommand("a", {
+    func = function(name)
+        ns.show_achievements(name)
+    end
+})

mods/rgt_achievements/mod.conf

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+name = rgt_achievements
+depnds = rgt_ui, rgt_base