diff --git a/src/itemscript.lua b/src/itemscript.lua
index 3989660..18875fa 100644
--- a/src/itemscript.lua
+++ b/src/itemscript.lua
@@ -259,7 +259,7 @@ function itemscript.totalCount(filterExpr)
     local filter = itemscript.filterize(filterExpr)
     local count = 0
     for i = 1, 16 do
-        local item = t.getItemDetail(i)
+        local item = turtle.getItemDetail(i)
         if filter(item) then
             count = count + item.count
         end
diff --git a/src/movescript.lua b/src/movescript.lua
index 42de964..e0314bc 100644
--- a/src/movescript.lua
+++ b/src/movescript.lua
@@ -291,7 +291,7 @@ function movescript.executeInstruction(instruction, settings)
         if action then
             debug("Executing action \"" .. instruction.action .. "\" " .. instruction.count .. " times.", settings)
             local shouldRefuel = (
-                (settings.safe or true) and
+                ((settings ~= nil and settings.safe) or true) and
                 (action.needsFuel) and
                 (instruction.count > t.getFuelLevel())
             )
diff --git a/src/ms-installer.lua b/src/ms-installer.lua
new file mode 100644
index 0000000..946bbb1
--- /dev/null
+++ b/src/ms-installer.lua
@@ -0,0 +1,24 @@
+--[[
+    An installation script that manages installing all movescript libraries easily.
+]]--
+
+local libs = {
+    "movescript.lua",
+    "itemscript.lua",
+    "buildscript.lua"
+}
+
+local BASE_URL = "https://andrewlalis.github.io/movescript/scripts/"
+
+for _, lib in pairs(libs) do
+    if fs.exists(lib) then
+        fs.delete(lib)
+        print("Deleted " .. lib)
+    end
+    local success = shell.run("wget", BASE_URL .. lib)
+    if not success then
+        error("Failed to install " .. lib)
+    end
+    print("Downloaded " .. lib)
+end
+print("Done!")