fix: properly check for global vim and configure luacheck

.luacheckrc

@@ -19,6 +19,8 @@ cache = true
 ignore = {
  "631", -- max_line_length
  "212/_.*", -- unused argument, for vars with "_" prefix
+ "121", -- setting read-only global variable 'vim'
+ "122", -- setting read-only field of global variable 'vim'
 }
 
 -- Global objects defined by the C code

runtime/lua/vim/_editor.lua

@@ -36,7 +36,7 @@
 -- - https://github.com/bakpakin/Fennel (pretty print, repl)
 -- - https://github.com/howl-editor/howl/tree/master/lib/howl/util
 
-local vim = assert(vim)
+vim = assert(vim)
 
 -- These are for loading runtime modules lazily since they aren't available in
 -- the nvim binary as specified in executor.c

runtime/lua/vim/_init_packages.lua

@@ -1,5 +1,4 @@
--- prevents luacheck from making lints for setting things on vim
-local vim = assert(vim)
+vim = assert(vim)
 
 local pathtrails = {}
 vim._so_trails = {}

runtime/lua/vim/_meta.lua

@@ -1,5 +1,4 @@
--- prevents luacheck from making lints for setting things on vim
-local vim = assert(vim)
+vim = assert(vim)
 
 local a = vim.api
 

runtime/lua/vim/lsp.lua

@@ -5,7 +5,7 @@ local protocol = require('vim.lsp.protocol')
 local util = require('vim.lsp.util')
 local sync = require('vim.lsp.sync')
 
-local vim = vim
+vim = assert(vim)
 local api = vim.api
 local nvim_err_writeln, nvim_buf_get_lines, nvim_command, nvim_buf_get_option, nvim_exec_autocmds =
  api.nvim_err_writeln,

runtime/lua/vim/lsp/buf.lua

@@ -1,4 +1,4 @@
-local vim = vim
+vim = assert(vim)
 local api = vim.api
 local validate = vim.validate
 local util = require('vim.lsp.util')

runtime/lua/vim/lsp/handlers.lua

@@ -1,7 +1,7 @@
 local log = require('vim.lsp.log')
 local protocol = require('vim.lsp.protocol')
 local util = require('vim.lsp.util')
-local vim = vim
+vim = assert(vim)
 local api = vim.api
 
 local M = {}

runtime/lua/vim/lsp/rpc.lua

@@ -1,4 +1,4 @@
-local vim = vim
+vim = assert(vim)
 local uv = vim.loop
 local log = require('vim.lsp.log')
 local protocol = require('vim.lsp.protocol')

runtime/lua/vim/lsp/util.lua

@@ -1,6 +1,6 @@
 local protocol = require('vim.lsp.protocol')
 local snippet = require('vim.lsp._snippet')
-local vim = vim
+vim = assert(vim)
 local validate = vim.validate
 local api = vim.api
 local list_extend = vim.list_extend

runtime/lua/vim/shared.lua

@@ -6,7 +6,7 @@
 -- or the test suite. (Eventually the test suite will be run in a worker process,
 -- so this wouldn't be a separate case to consider)
 
-local vim = vim or {}
+vim = assert(vim)
 
 --- Returns a deep copy of the given object. Non-table objects are copied as
 --- in a typical Lua assignment, whereas table objects are copied recursively.