Support Vim script plugins

lua/cmp/vim_source.lua

@@ -0,0 +1,52 @@
+local misc = require('cmp.utils.misc')
+
+local vim_source = {}
+
+---@param id number
+---@param args any[]
+vim_source.on_callback = function(id, args)
+  return vim_source.to_callback.callbacks[id](unpack(args))
+end
+
+---@param callback function
+---@return number
+vim_source.to_callback = setmetatable({
+  callbacks = {}
+}, {
+  __call = function(self, callback)
+    local id = misc.id('cmp.vim_source.to_callback')
+    self.callbacks[id] = function(...)
+      callback(...)
+      self.callbacks[id] = nil
+    end
+    return id
+  end
+})
+
+---Convert to serializable args.
+---@param args any[]
+vim_source.to_args = function(args)
+  for i, arg in ipairs(args) do
+    if type(arg) == 'function' then
+      args[i] = vim_source.to_callback(arg)
+    end
+  end
+  return args
+end
+
+---@param id number
+---@param methods string[]
+vim_source.new = function (id, methods)
+  local self = setmetatable({}, { __index = vim_source })
+  for _, method in ipairs(methods) do
+    self[method] = (function(m)
+      return function(_, ...)
+        return vim.fn['cmp#_method'](id, m, vim_source.to_args({ ... }))
+      end
+    end)(method)
+  end
+  return self
+end
+
+return vim_source
+