Monkey patch the Spinach StdoutReporter to show scenario locations

Before:

    Scenario: Viewing invitation when signed out
      ✔  Given "John Doe" is owner of group "Owned" # features/steps/shared/group.rb:8

After:

    Scenario: Viewing invitation when signed out    # features/invites.feature:6
      ✔  Given "John Doe" is owner of group "Owned" # features/steps/shared/group.rb:8

Now if a scenario fails we can easily rerun it with a specific line
number.

features/support/env.rb

@@ -33,3 +33,19 @@ Spinach.hooks.before_run do
 
   include FactoryGirl::Syntax::Methods
 end
+
+module StdoutReporterWithScenarioLocation
+  # Override the standard reporter to show filename and line number next to each
+  # scenario for easy, focused re-runs
+  def before_scenario_run(scenario, step_definitions = nil)
+    @max_step_name_length = scenario.steps.map(&:name).map(&:length).max if scenario.steps.any?
+    name = scenario.name
+
+    # This number has no significance, it's just to line things up
+    max_length = @max_step_name_length + 19
+    out.puts "\n  #{'Scenario:'.green} #{name.light_green.ljust(max_length)}" \
+      " # #{scenario.feature.filename}:#{scenario.line}"
+  end
+end
+
+Spinach::Reporter::Stdout.prepend(StdoutReporterWithScenarioLocation)