Publish Action Cable to NPM when we release.

Signed-off-by: Jeremy Daer <jeremydaer@gmail.com>

RELEASING_RAILS.md

@@ -103,18 +103,24 @@ branch.
 Run `rake install` to generate the gems and install them locally. Then try
 generating a new app and ensure that nothing explodes.
 
+Verify that Action Cable's package.json is updated with the RC version.
+
 This will stop you from looking silly when you push an RC to rubygems.org and
 then realize it is broken.
 
-### Release the gem.
+### Release to RubyGems and NPM.
 
-IMPORTANT: Due to YAML parse problems on the rubygems.org server, it is safest
-to use Ruby 1.8 when releasing.
+IMPORTANT: The Action Cable client is released as an NPM package, so you must
+have Node.js installed, have an NPM account (npmjs.com), and be an actioncable
+package owner (`npm owner ls actioncable`) to do a full release. Do not release
+until you're set up with NPM!
 
-Run `rake release`.  This will populate the gemspecs with data from
-RAILS_VERSION, commit the changes, tag it, and push the gems to rubygems.org.
-Here are the commands that `rake release` should use, so you can understand
-what to do in case anything goes wrong:
+Run `rake release`. This will populate the gemspecs and NPM package.json with
+the current RAILS_VERSION, commit the changes, tag it, and push the gems to
+rubygems.org.
+
+Here are the commands that `rake release` uses so you can understand what to do
+in case anything goes wrong:
 
 ```
 $ rake all:build
@@ -122,7 +128,7 @@ $ git commit -am'updating RAILS_VERSION'
 $ git tag -m 'v3.0.10.rc1 release' v3.0.10.rc1
 $ git push
 $ git push --tags
-$ for i in $(ls pkg); do gem push $i; done
+$ for i in $(ls pkg); do gem push $i; npm publish; done
 ```
 
 ### Send Rails release announcements

actioncable/app/assets/javascripts/action_cable.coffee.erb

@@ -33,3 +33,9 @@
     if @debugging
       messages.push(Date.now())
       console.log("[ActionCable]", messages...)
+
+# NOTE: We expose ActionCable as a browser global so we can reference it
+# internally without concern for how the module is loaded.
+window?.ActionCable = @ActionCable
+
+module?.exports = @ActionCable

actioncable/package.json

@@ -0,0 +1,24 @@
+{
+  "name": "actioncable",
+  "version": "5.0.0-rc1",
+  "description": "WebSocket framework for Ruby on Rails.",
+  "main": "lib/assets/compiled/action_cable.js",
+  "files": [
+    "lib/assets/compiled/*.js"
+  ],
+  "repository": {
+    "type": "git",
+    "url": "rails/rails"
+  },
+  "keywords": [
+    "websockets",
+    "actioncable",
+    "rails"
+  ],
+  "author": "David Heinemeier Hansson <david@loudthinking.com>",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/rails/rails/issues"
+  },
+  "homepage": "http://rubyonrails.org/"
+}

tasks/release.rb

@@ -44,6 +44,36 @@
       raise "Could not insert PRE in #{file}" unless $1
 
       File.open(file, 'w') { |f| f.write ruby }
+
+      if File.exist?("#{framework}/package.json")
+        Dir.chdir("#{framework}") do
+          # This "npm-ifies" the current version
+          # With npm, versions such as "5.0.0.rc1" or "5.0.0.beta1.1" are not compliant with its
+          # versioning system, so they must be transformed to "5.0.0-rc1" and "5.0.0-beta1-1" respectively.
+
+          # In essence, the code below runs through all "."s that appear in the version,
+          # and checks to see if their index in the version string is greater than or equal to 2,
+          # and if so, it will change the "." to a "-".
+
+          # Sample version transformations:
+          # irb(main):001:0> version = "5.0.1.1"
+          # => "5.0.1.1"
+          # irb(main):002:0> version.gsub(/\./).with_index { |s, i| i >= 2 ? '-' : s }
+          # => "5.0.1-1"
+          # irb(main):003:0> version = "5.0.0.rc1"
+          # => "5.0.0.rc1"
+          # irb(main):004:0> version.gsub(/\./).with_index { |s, i| i >= 2 ? '-' : s }
+          # => "5.0.0-rc1"
+          version = version.gsub(/\./).with_index { |s, i| i >= 2 ? '-' : s }
+
+          # Check if npm is installed, and raise an error if not
+          if sh 'which npm'
+            sh "npm version #{version} --no-git-tag-version"
+          else
+            raise 'You must have npm installed to release Rails.'
+          end
+        end
+      end
     end
 
     task gem => %w(update_versions pkg) do
@@ -61,6 +91,7 @@
 
     task :push => :build do
       sh "gem push #{gem}"
+      sh "npm publish" if File.exist?("#{framework}/package.json")
     end
   end
 end