Add whitelist capabilities

compcount.lua

@@ -32,6 +32,7 @@ local chainItemsByBaseId
 local baseItemIds
 local itemById
 local defaultBaseId
+local whitelistLookup
 local fallbackIcon = false
 local backButton = false
 local scrollUpButton = false
@@ -40,8 +41,40 @@ local overviewScrollCurrentRow = 0
 local overviewScrollTargetRow = 0
 local drawOverview
 
+local function ensureWhitelistLoaded()
+  if whitelistLookup ~= nil then
+    return
+  end
+
+  if not fs.exists("whitelist.json") then
+    whitelistLookup = false
+    return
+  end
+
+  local file = assert(fs.open("whitelist.json", "r"))
+  local data = textutils.unserializeJSON(file.readAll())
+  file.close()
+
+  assert(type(data) == "table", "Invalid whitelist.json data")
+
+  if #data == 0 then
+    whitelistLookup = false
+    return
+  end
+
+  whitelistLookup = {}
+
+  for i = 1, #data do
+    local baseId = data[i]
+    assert(type(baseId) == "string", "Invalid whitelist.json entry")
+    whitelistLookup[baseId] = true
+  end
+end
+
 local function ensureChainsLoaded()
   if not chainItemsByBaseId then
+    ensureWhitelistLoaded()
+
     local file = assert(fs.open("atc_chains.json", "r"))
     local data = textutils.unserializeJSON(file.readAll())
     file.close()
@@ -53,6 +86,7 @@ local function ensureChainsLoaded()
     itemById = {}
 
     for _, chain in ipairs(data.chains) do
+      if not whitelistLookup or whitelistLookup[chain.base_id] then
         if not defaultBaseId then
           defaultBaseId = chain.base_id
         end
@@ -81,6 +115,7 @@ local function ensureChainsLoaded()
         chainItemsByBaseId[chain.base_id] = items
       end
     end
+  end
 end
 
 local function getPageItems(base_id)

whitelist.json

@@ -0,0 +1,3 @@
+[
+    
+]