Avoid terminating the process inside lib/ code

Author: dentarg

bin/rerun

@@ -15,4 +15,8 @@ end
 
 exit if options.nil? or options[:cmd].nil? or options[:cmd].empty?
 
-Rerun::Runner.keep_running(options[:cmd], options)
+begin
+  Rerun::Runner.keep_running(options[:cmd], options)
+rescue Rerun::ExitException
+  exit 0
+end

lib/rerun.rb

@@ -10,6 +10,8 @@
 require "rerun/glob"
 
 module Rerun
-
+  # Raised when the runner wants to exit cleanly.
+  # This allows tests to catch the exit instead of terminating the process.
+  class ExitException < StandardError; end
 end
 

lib/rerun/runner.rb

@@ -160,7 +160,7 @@ def start
         say "Rerun (#{$PID}) running #{app_name} (#{@pid})"
       rescue => e
         puts "#{e.class}: #{e.message}"
-        exit
+        raise ExitException
       end
 
       status_thread = Process.detach(@pid) # so if the child exits, it dies
@@ -235,7 +235,7 @@ def change_message(changes)
     def die
       #stop_keypress_thread   # don't do this since we're probably *in* the keypress thread
       stop # stop the child process if it exists
-      exit 0 # todo: status code param
+      raise ExitException # todo: status code param
     end
 
     def join