dev (#1)

* dev

* Improve sync design

* Support buffer local mapping

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lua/cmp/utils/cache.lua

@@ -0,0 +1,57 @@
+---@class cmp.Cache
+---@field public entries any
+local cache = {}
+
+cache.new = function()
+  local self = setmetatable({}, { __index = cache })
+  self.entries = {}
+  return self
+end
+
+---Get cache value
+---@param key string
+---@return any|nil
+cache.get = function(self, key)
+  key = self:key(key)
+  if self.entries[key] ~= nil then
+    return unpack(self.entries[key])
+  end
+  return nil
+end
+
+---Set cache value explicitly
+---@param key string
+---@vararg any
+cache.set = function(self, key, ...)
+  key = self:key(key)
+  self.entries[key] = { ... }
+end
+
+---Ensure value by callback
+---@param key string
+---@param callback fun(): any
+cache.ensure = function(self, key, callback)
+  local value = self:get(key)
+  if value == nil then
+    self:set(key, callback())
+  end
+  return self:get(key)
+end
+
+---Clear all cache entries
+cache.clear = function(self)
+  self.entries = {}
+end
+
+---Create key
+---@param key string|table
+---@return string
+cache.key = function(_, key)
+  if type(key) == 'table' then
+    return table.concat(key, ':')
+  end
+  return key
+end
+
+return cache
+