Make the text presented to the user customizable

features/user_informer.feature

@@ -18,4 +18,25 @@ Feature: Inform the user of the hoptoad notice that was just created
       """
     And I route "/test/index" to "test#index"
     And I perform a request to "http://example.com:123/test/index?param=value"
+    Then I should see "Hoptoad Error 3799307"
+
+  Scenario: Rescue an exception in a controller with a custom error string
+    When I generate a new Rails application
+    And I configure the Hoptoad shim
+    And I configure my application to require the "hoptoad_notifier" gem
+    And I configure the notifier to use the following configuration lines:
+    """
+    config.user_information = "Error #{{ error_id }}"
+    """
+    And I run the hoptoad generator with "-k myapikey"
+    And I define a response for "TestController#index":
+      """
+      raise RuntimeError, "some message"
+      """
+    And the response page for a "500" error is
+      """
+      <!-- HOPTOAD ERROR -->
+      """
+    And I route "/test/index" to "test#index"
+    And I perform a request to "http://example.com:123/test/index?param=value"
     Then I should see "Error #3799307"

lib/hoptoad_notifier/configuration.rb

@@ -7,7 +7,8 @@ class Configuration
         :http_open_timeout, :http_read_timeout, :ignore, :ignore_by_filters,
         :ignore_user_agent, :notifier_name, :notifier_url, :notifier_version,
         :params_filters, :project_root, :port, :protocol, :proxy_host,
-        :proxy_pass, :proxy_port, :proxy_user, :secure, :framework, :js_notifier].freeze
+        :proxy_pass, :proxy_port, :proxy_user, :secure, :framework,
+        :js_notifier, :user_information].freeze
 
     # The API key for your project, found on the project edit form.
     attr_accessor :api_key
@@ -83,6 +84,9 @@ class Configuration
     # The logger used by HoptoadNotifier
     attr_accessor :logger
 
+    # The text that the placeholder is replaced with. {{error_id}} is the actual error number.
+    attr_accessor :user_information
+
     # The framework HoptoadNotifier is configured to use
     attr_accessor :framework
 
@@ -133,6 +137,7 @@ def initialize
       @notifier_version         = VERSION
       @notifier_url             = 'http://hoptoadapp.com'
       @framework                = 'Standalone'
+      @user_information         = 'Hoptoad Error {{error_id}}'
     end
 
     # Takes a block and adds it to the list of backtrace filters. When the filters

lib/hoptoad_notifier/user_informer.rb

@@ -4,6 +4,10 @@ def initialize(app)
       @app = app
     end
 
+    def replacement(with)
+      @replacement ||= HoptoadNotifier.configuration.user_information.gsub(/\{\{\s*error_id\s*\}\}/, with.to_s)
+    end
+
     def call(env)
       response = @app.call(env)
       if env['hoptoad.error_id']
@@ -12,7 +16,7 @@ def call(env)
         modified_content_length = 0
         response[2].each do |chunk|
           original_content_length += chunk.length
-          new_response << chunk.to_s.gsub("<!-- HOPTOAD ERROR -->", "Error ##{env["hoptoad.error_id"].to_s}")
+          new_response << chunk.to_s.gsub("<!-- HOPTOAD ERROR -->", replacement(env['hoptoad.error_id']))
           modified_content_length += new_response.last.length
         end
         response[1]['Content-Length'] = modified_content_length.to_s

test/user_informer_test.rb

@@ -11,8 +11,8 @@ class UserInformerTest < Test::Unit::TestCase
     ShamRack.mount(informer_app, "example.com")
 
     response = Net::HTTP.get_response(URI.parse("http://example.com/"))
-    assert_equal "Error #1", response.body
-    assert_equal 8, response["Content-Length"].to_i
+    assert_equal "Hoptoad Error 1", response.body
+    assert_equal 15, response["Content-Length"].to_i
   end
 
   should "not modify output if there is no hoptoad id" do