reload_templates setting; on by default in :development [sinatra#321]

Enabling the reload_templates setting causes template files to be
reread from disk and recompiled on each request. It's disabled by
default in all environments except for development.

CHANGES

@@ -9,9 +9,12 @@
    template backtraces, and support for new template engines, like
    mustache and liquid.
 
+ * New boolean 'reload_templates' setting controls whether template files
+   are reread from disk and recompiled on each request. Template read/compile
+   is cached by default in all environments except development.
+
  * New 'settings' method gives access to options in both class and request
    scopes. This replaces the 'options' method.
-
  * New 'erubis' helper method for rendering Erubis templates.
 
  * New 'expires' helper method is like cache_control but takes an

lib/sinatra/base.rb

@@ -387,6 +387,7 @@ def call!(env)
       @request  = Request.new(env)
       @response = Response.new
       @params   = indifferent_params(@request.params)
+      @template_cache.clear if settings.reload_templates
 
       invoke { dispatch! }
       invoke { error_block!(response.status) }
@@ -1039,8 +1040,9 @@ def caller_locations
 
     set :app_file, nil
     set :root, Proc.new { app_file && File.expand_path(File.dirname(app_file)) }
-    set :views, Proc.new { root && File.join(root, 'views') }
     set :public, Proc.new { root && File.join(root, 'public') }
+    set :views, Proc.new { root && File.join(root, 'views') }
+    set :reload_templates, Proc.new { !development? }
     set :lock, false
 
     error ::Exception do