Improve deprecation checks

- Move `layout_defaults` handling to `deprecated.lua`
- Check for "layout keys" outside of `layout_config` on `setup`

lua/telescope/config.lua

@@ -1,5 +1,5 @@
 local strings = require "plenary.strings"
-local log = require "telescope.log"
+local deprecated = require "telescope.deprecated"
 local sorters = require "telescope.sorters"
 local if_nil = vim.F.if_nil
 
@@ -308,14 +308,10 @@ function config.set_defaults(user_defaults, tele_defaults)
   user_defaults = if_nil(user_defaults, {})
   tele_defaults = if_nil(tele_defaults, telescope_defaults)
 
-  if user_defaults.layout_defaults then
-    if user_defaults.layout_config == nil then
-      log.info "Using 'layout_defaults' in setup() is deprecated. Use 'layout_config' instead."
-      user_defaults.layout_config = user_defaults.layout_defaults
-    else
-      error "Using 'layout_defaults' in setup() is deprecated. Remove this key and use 'layout_config' instead."
-    end
-  end
+  -- Check if using layout keywords outside of `layout_config`
+  deprecated.picker_window_options(user_defaults)
+  -- Check if using `layout_defaults` instead of `layout_config`
+  user_defaults = deprecated.layout_configuration(user_defaults)
 
   local function get(name, default_val)
     if name == "layout_config" then

lua/telescope/deprecated.lua

@@ -1,10 +1,11 @@
+local log = require "telescope.log"
 
 local deprecated = {}
 
 deprecated.picker_window_options = function(opts)
   local messages = {}
 
-  -- Deprecated: PR:922, 2021/05/17
+  -- Deprecated: PR:922, 2021/06/25
   -- Can be removed in a few weeks.
 
   if opts.width then
@@ -43,4 +44,16 @@ deprecated.picker_window_options = function(opts)
   end
 end
 
+deprecated.layout_configuration = function(user_defaults)
+  if user_defaults.layout_defaults then
+    if user_defaults.layout_config == nil then
+      log.warn "Using 'layout_defaults' in setup() is deprecated. Use 'layout_config' instead."
+      user_defaults.layout_config = user_defaults.layout_defaults
+    else
+      error "Using 'layout_defaults' in setup() is deprecated. Remove this key and use 'layout_config' instead."
+    end
+  end
+  return user_defaults
+end
+
 return deprecated