1 files changed, 83 insertions, 0 deletions
diff --git a/runtime/lua/vim/_init_packages.lua b/runtime/lua/vim/_init_packages.lua
new file mode 100644
index 0000000000..7e3c73667e
--- /dev/null
+++ b/runtime/lua/vim/_init_packages.lua
@@ -0,0 +1,83 @@
+-- prevents luacheck from making lints for setting things on vim
+local vim = assert(vim)
+
+local pathtrails = {}
+vim._so_trails = {}
+for s in (package.cpath .. ';'):gmatch('[^;]*;') do
+  s = s:sub(1, -2) -- Strip trailing semicolon
+  -- Find out path patterns. pathtrail should contain something like
+  -- /?.so, \?.dll. This allows not to bother determining what correct
+  -- suffixes are.
+  local pathtrail = s:match('[/\\][^/\\]*%?.*$')
+  if pathtrail and not pathtrails[pathtrail] then
+    pathtrails[pathtrail] = true
+    table.insert(vim._so_trails, pathtrail)
+  end
+end
+
+function vim._load_package(name)
+  local basename = name:gsub('%.', '/')
+  local paths = { 'lua/' .. basename .. '.lua', 'lua/' .. basename .. '/init.lua' }
+  local found = vim.api.nvim__get_runtime(paths, false, { is_lua = true })
+  if #found > 0 then
+    local f, err = loadfile(found[1])
+    return f or error(err)
+  end
+
+  local so_paths = {}
+  for _, trail in ipairs(vim._so_trails) do
+    local path = 'lua' .. trail:gsub('?', basename) -- so_trails contains a leading slash
+    table.insert(so_paths, path)
+  end
+
+  found = vim.api.nvim__get_runtime(so_paths, false, { is_lua = true })
+  if #found > 0 then
+    -- Making function name in Lua 5.1 (see src/loadlib.c:mkfuncname) is
+    -- a) strip prefix up to and including the first dash, if any
+    -- b) replace all dots by underscores
+    -- c) prepend "luaopen_"
+    -- So "foo-bar.baz" should result in "luaopen_bar_baz"
+    local dash = name:find('-', 1, true)
+    local modname = dash and name:sub(dash + 1) or name
+    local f, err = package.loadlib(found[1], 'luaopen_' .. modname:gsub('%.', '_'))
+    return f or error(err)
+  end
+  return nil
+end
+
+-- Insert vim._load_package after the preloader at position 2
+table.insert(package.loaders, 2, vim._load_package)
+
+-- builtin functions which always should be available
+require('vim.shared')
+
+vim._submodules = { inspect = true }
+
+-- These are for loading runtime modules in the vim namespace lazily.
+setmetatable(vim, {
+  __index = function(t, key)
+    if vim._submodules[key] then
+      t[key] = require('vim.' .. key)
+      return t[key]
+    elseif vim.startswith(key, 'uri_') then
+      local val = require('vim.uri')[key]
+      if val ~= nil then
+        -- Expose all `vim.uri` functions on the `vim` module.
+        t[key] = val
+        return t[key]
+      end
+    end
+  end,
+})
+
+--- <Docs described in |vim.empty_dict()| >
+---@private
+--- TODO: should be in vim.shared when vim.shared always uses nvim-lua
+function vim.empty_dict()
+  return setmetatable({}, vim._empty_dict_mt)
+end
+
+-- only on main thread: functions for interacting with editor state
+if not vim.is_thread() then
+  require('vim._editor')
+end