Deprecate using Sinatra::ApexCharts extension

Author: styd

CHANGELOG.md

@@ -16,6 +16,10 @@ All notable changes to this project will be documented in this file.
 - Chart options set globally not showing as default options
 - Chart height options not overriden by default options
 
+### Deprecated
+- Using Sinatra helper name `Sinatra::ApexCharts`. No need to call
+  anything after requiring 'apexcharts' now.
+
 ## [0.2.0] - 2022-02-28
 ### Added
 - Option to render chart with a script whose type is module

docs/web-support/sinatra.md

@@ -1,15 +1,10 @@
 ### Sinatra
 
-Require it after you `require 'sinatra/base'` and add helper `Sinatra::ApexCharts` in the
-class that inherits from `Sinatra::Base`.
+Require it after you `require 'sinatra/base'`.
 
 ```ruby
 require 'sinatra/base'
 require 'apexcharts'
-
-class SimpleApp < Sinatra::Base
-  helpers Sinatra::ApexCharts
-end
 ```
 
 To add the asset (ApexCharts.JS), include a script tag in your template

lib/apex_charts/support/sinatra.rb

@@ -1,9 +1,23 @@
 # frozen_string_literal: true
 
 module Sinatra
-  module ApexCharts
-    include ::ApexCharts::Helper
+  def self.const_missing(const_name)
+    if const_name == :ApexCharts
+      warn "[DEPRECATION] specifying `Sinatra::#{const_name}` as " \
+           'helper is deprecated and will raise an error in next ' \
+           'release. Requiring ApexCharts (`require "apexcharts"`) ' \
+           'is enough to use its chart helper methods.'
+      ::ApexCharts::SinatraHelper
+    else
+      super
+    end
   end
+end
 
-  helpers ApexCharts
+module ApexCharts
+  module SinatraHelper
+    include ::ApexCharts::Helper
+  end
 end
+
+Sinatra::Base.helpers ApexCharts::SinatraHelper