Add bin/dev via foreman to run multiple processes

Author: David Heinemeier Hansson

lib/install/Procfile.dev

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

lib/install/dev

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

lib/install/install.rb

@@ -26,3 +26,17 @@
   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", "js: yarn build --watch"
+else
+  say "Add default Procfile.dev"
+  copy_file "#{__dir__}/Procfile.dev", "Procfile.dev"
+
+  say "Ensure foreman is installed"
+  run "gem install foreman"
+end
+
+say "Add bin/dev to start foreman"
+copy_file "#{__dir__}/dev", "bin/dev"
+chmod "bin/dev", 0755, verbose: false