fix(keymap): avoid Luau callback timeouts (#76)

keymap/tests/mangowc_scale_test.lua

@@ -0,0 +1,75 @@
+local sourceLines = {}
+for index = 1, 93 do
+  if index % 20 == 1 then
+    sourceLines[#sourceLines + 1] = "# Group " .. tostring(math.floor(index / 20) + 1)
+  end
+  sourceLines[#sourceLines + 1] = string.format(
+    'bind=SUPER,Key%d,spawn_shell,true #"Action %d"', index, index
+  )
+end
+local source = table.concat(sourceLines, "\n")
+
+local values, watchers = {
+  ["keymap.snapshot"] = {
+    status = "ready", compositor = "MangoWC", total = 1,
+    categories = { { name = "Previous", binds = { { id = "previous" } } } },
+  },
+}, {}
+local reads, xorCalls, loadingCategoryCount = 0, 0, -1
+local originalBit32 = bit32
+bit32 = {
+  bxor = function(left, right)
+    xorCalls = xorCalls + 1
+    local result, place = 0, 1
+    for _ = 1, 8 do
+      if left % 2 ~= right % 2 then result = result + place end
+      left = math.floor(left / 2)
+      right = math.floor(right / 2)
+      place = place * 2
+    end
+    return result
+  end,
+}
+
+noctalia = {
+  state = {
+    get = function(key) return values[key] end,
+    set = function(key, value)
+      if key == "keymap.snapshot" and value.status == "loading" then
+        loadingCategoryCount = #(value.categories or {})
+      end
+      values[key] = value
+      if watchers[key] ~= nil then watchers[key](value) end
+    end,
+    watch = function(key, callback) watchers[key] = callback end,
+  },
+  getConfig = function(key)
+    return ({ compositor = "mangowc", mangowc_config = "/fixture/config.conf", merge_sequential = false })[key]
+  end,
+  getenv = function(key) return key == "MANGO_INSTANCE_SIGNATURE" and "test" or "" end,
+  expandPath = function(path) return path end,
+  fileExists = function(path) return path == "/fixture/config.conf" end,
+  listDir = function() return nil end,
+  readFile = function(path)
+    if path ~= "/fixture/config.conf" then return nil end
+    reads = reads + 1
+    return source
+  end,
+  tr = function(key, args)
+    if args ~= nil and args.action ~= nil then return args.action end
+    return key == "category.other" and "Other" or key
+  end,
+}
+
+assert(loadfile("mangowc_service.luau"))()
+bit32 = originalBit32
+
+local snapshot = values["keymap.snapshot"]
+assert(snapshot.status == "ready", "large MangoWC fixture did not parse")
+assert(snapshot.total == 93, "large MangoWC fixture lost binds")
+assert(#snapshot.categories == 5, "large MangoWC fixture lost category markers")
+assert(reads == 1, "MangoWC root config should only be read once per refresh")
+assert(loadingCategoryCount == 0, "loading snapshot should not reserialize the previous bind tree")
+assert(xorCalls > 0, "MangoWC parser did not use the native-xor fingerprint path")
+
+print("MangoWC scale tests: ok")