Print "Running via Spring preloader" message from the app process

Rather than from the Spring client process. See
https://github.com/rails/spring/pull/455/files#r48411471

Within the app process, we'll have access to the spring config, to see
whether Spring.quiet has been set.

This means we can remove the spring/commands require from the client
side, which should never have been added and caused problems (rails#456, rails#457).

I'm getting rid of the feature which omits this message when run
manually (i.e. `spring rails runner ...` rather than `bin/rails runner
...`) because:

1. It makes the implementation more complicated
2. YAGNI

CHANGELOG.md

@@ -1,3 +1,8 @@
+## Next release
+
+* Fix problems with the implementation of the new "Running via Spring preloader"
+  message (see #456, #457)
+
 ## 1.6.1
 
 * support replaced backtraces / backtraces with only line and number

bin/spring

@@ -46,6 +46,4 @@ end
 lib = File.expand_path("../../lib", __FILE__)
 $LOAD_PATH.unshift lib unless $LOAD_PATH.include?(lib) # enable local development
 require 'spring/client'
-# if the user knows that spring is called, do not show running spring
-Spring.quiet = true if $0.include? 'spring'
 Spring::Client.run(ARGV)

lib/spring/application.rb

@@ -157,6 +157,8 @@ def serve(client)
         IGNORE_SIGNALS.each { |sig| trap(sig, "DEFAULT") }
         trap("TERM", "DEFAULT")
 
+        puts "Running via Spring preloader in process #{Process.pid}" unless Spring.quiet
+
         ARGV.replace(args)
         $0 = command.exec_name
 

lib/spring/client/run.rb

@@ -1,4 +1,3 @@
-require "spring/commands"
 require "rbconfig"
 require "socket"
 require "bundler"
@@ -139,8 +138,6 @@ def run_command(client, application)
         if pid && !pid.empty?
           log "got pid: #{pid}"
 
-          puts "Running via Spring preloader in process #{pid}" unless Spring.quiet
-
           forward_signals(pid.to_i)
           status = application.read.to_i
 

lib/spring/test/acceptance_test.rb

@@ -107,11 +107,6 @@ def without_gem(name)
         assert_success app.spring_test_command, stdout: "Running via Spring preloader in process"
       end
 
-      test "does not tell the user that spring is being used when the user used spring manually" do
-        refute_output_includes "spring rails runner ''", stdout: "Running via Spring preloader in process"
-        refute_output_includes "spring rake test", stdout: "Running via Spring preloader in process"
-      end
-
       test "does not tell the user that spring is being used when used automatically via binstubs but quiet is enabled" do
         File.write("#{app.user_home}/.spring.rb", "Spring.quiet = true")
         assert_success "bin/rails runner ''"