Merge pull request #17375 from shadmansaleh/fix/vim.g/autoload

fix: autoload variables not loaded with vim.g & nvim_get_var

src/nvim/api/vim.c

@@ -601,7 +601,19 @@ void nvim_del_current_line(Error *err)
 Object nvim_get_var(String name, Error *err)
   FUNC_API_SINCE(1)
 {
-  return dict_get_value(&globvardict, name, err);
+  dictitem_T *di = tv_dict_find(&globvardict, name.data, (ptrdiff_t)name.size);
+  if (di == NULL) {  // try to autoload script
+    if (!script_autoload(name.data, name.size, false) || aborting()) {
+      api_set_error(err, kErrorTypeValidation, "Key not found: %s", name.data);
+      return (Object)OBJECT_INIT;
+    }
+    di = tv_dict_find(&globvardict, name.data, (ptrdiff_t)name.size);
+  }
+  if (di == NULL) {
+    api_set_error(err, kErrorTypeValidation, "Key not found: %s", name.data);
+    return (Object)OBJECT_INIT;
+  }
+  return vim_to_object(&di->di_tv);
 }
 
 /// Sets a global (g:) variable.

src/nvim/lua/stdlib.c

@@ -25,6 +25,7 @@
 #include "nvim/func_attr.h"
 #include "nvim/garray.h"
 #include "nvim/getchar.h"
+#include "nvim/globals.h"
 #include "nvim/lua/converter.h"
 #include "nvim/lua/executor.h"
 #include "nvim/lua/stdlib.h"
@@ -408,6 +409,12 @@ int nlua_getvar(lua_State *lstate)
   const char *name = luaL_checklstring(lstate, 3, &len);
 
   dictitem_T *di = tv_dict_find(dict, name, (ptrdiff_t)len);
+  if (di == NULL && dict == &globvardict) {  // try to autoload script
+    if (!script_autoload(name, len, false) || aborting()) {
+       return 0;  // nil
+    }
+    di = tv_dict_find(dict, name, (ptrdiff_t)len);
+  }
   if (di == NULL) {
     return 0;  // nil
   }

test/functional/api/vim_spec.lua

@@ -898,6 +898,19 @@ describe('API', function()
       command('lockvar lua')
       eq('Key is locked: lua', pcall_err(meths.del_var, 'lua'))
       eq('Key is locked: lua', pcall_err(meths.set_var, 'lua', 1))
+
+      -- Check if autoload works properly
+      local pathsep = helpers.get_pathsep()
+      local xconfig = 'Xhome' .. pathsep .. 'Xconfig'
+      local xdata = 'Xhome' .. pathsep .. 'Xdata'
+      local autoload_folder = table.concat({xconfig, 'nvim', 'autoload'}, pathsep)
+      local autoload_file = table.concat({autoload_folder , 'testload.vim'}, pathsep)
+      mkdir_p(autoload_folder)
+      write_file(autoload_file , [[let testload#value = 2]])
+
+      clear{ args_rm={'-u'}, env={ XDG_CONFIG_HOME=xconfig, XDG_DATA_HOME=xdata } }
+      eq(2, meths.get_var('testload#value'))
+      rmdir('Xhome')
     end)
 
     it('nvim_get_vvar, nvim_set_vvar', function()

test/functional/lua/vim_spec.lua

@@ -19,6 +19,9 @@ local NIL = helpers.NIL
 local retry = helpers.retry
 local next_msg = helpers.next_msg
 local remove_trace = helpers.remove_trace
+local mkdir_p = helpers.mkdir_p
+local rmdir = helpers.rmdir
+local write_file = helpers.write_file
 
 before_each(clear)
 
@@ -1019,6 +1022,20 @@ describe('lua stdlib', function()
     eq(3, exec_lua([[return vim.g.GetCounter()]]))
     exec_lua([[vim.api.nvim_get_var('AddCounter')()]])
     eq(4, exec_lua([[return vim.api.nvim_get_var('GetCounter')()]]))
+
+    -- Check if autoload works properly
+    local pathsep = helpers.get_pathsep()
+    local xconfig = 'Xhome' .. pathsep .. 'Xconfig'
+    local xdata = 'Xhome' .. pathsep .. 'Xdata'
+    local autoload_folder = table.concat({xconfig, 'nvim', 'autoload'}, pathsep)
+    local autoload_file = table.concat({autoload_folder , 'testload.vim'}, pathsep)
+    mkdir_p(autoload_folder)
+    write_file(autoload_file , [[let testload#value = 2]])
+
+    clear{ args_rm={'-u'}, env={ XDG_CONFIG_HOME=xconfig, XDG_DATA_HOME=xdata } }
+
+    eq(2, exec_lua("return vim.g['testload#value']"))
+    rmdir('Xhome')
   end)
 
   it('vim.b', function()