Add bin/dev to run multiple processes

Author: David Heinemeier Hansson

lib/install/Procfile.dev

@@ -0,0 +1,2 @@
+web: bin/rails server
+css: yarn build:css --watch

lib/install/dev

@@ -0,0 +1,3 @@
+#!/usr/bin/env bash
+
+foreman start -f Procfile.dev

lib/install/install.rb

@@ -14,3 +14,16 @@
   say "Add default package.json"
   copy_file "#{__dir__}/package.json", "package.json"
 end
+
+if Rails.root.join("Procfile.dev").exist?
+  append_to_file "Procfile.dev", "css: yarn build:css --watch"
+else
+  say "Add default Procfile.dev"
+  copy_file "#{__dir__}/Procfile.dev", "Procfile.dev"
+
+  say "Ensure foreman is install"
+  run "gem install foreman"
+end
+
+say "Add bin/dev to start foreman"
+copy_file "#{__dir__}/dev", "bin/dev"