Remove documentation tasks

This patch removes the tasks doc:app, doc:rails, and doc:guides.

In our experience applications do not generate APIs using doc:app.
Methods may be certainly documented for maintainers, annotated
with YARD tags, etc. but that is intended to be read with the
source code, not in a separate website. Then, teams also have
typically selected topics written down in Markdown files, or in
a GitHub wiki... that kind of thing.

If a team absolutely needs to generate application documentation
for internal purposes, they can still easily write their own task.

Regarding doc:rails and doc:guides, we live in 2015. We are used
to go to online docs all the time. If you really want access to the
API offline RubyGems generates it for every Rails component unless
you tell it not to, and you can checkout the Rails source code to
read the guides as Markdown, or download them for a Kindle reader.

All in all, maintaining this code does not seem to be worthwhile
anymore.

As a consequence of this, guides (+3 MB uncompressed) won't be
distributed with the rails gem anymore. Of course, guides and API
are going to be still part of releases, since documentation is
maintained alongside code and tests.

Also, time permitting, this will allow us to experiment with novel
ways to generate documentation in the Rails docs server, since
right now we were constrained by being able to generate them in
the user's environment.

9 files changed, 5 insertions, 121 deletions

diff --git a/guides/source/command_line.md b/guides/source/command_line.md
index 78f26ccefa..19ccdc5488 100644
--- a/guides/source/command_line.md
+++ b/guides/source/command_line.md
@@ -419,14 +419,6 @@ The most common tasks of the `db:` Rake namespace are `migrate` and `create`, an
 
 More information about migrations can be found in the [Migrations](migrations.html) guide.
 
-### `doc`
-
-The `doc:` namespace has the tools to generate documentation for your app, API documentation, guides. Documentation can also be stripped which is mainly useful for slimming your codebase, like if you're writing a Rails application for an embedded platform.
-
-* `rake doc:app` generates documentation for your application in `doc/app`.
-* `rake doc:guides` generates Rails guides in `doc/guides`.
-* `rake doc:rails` generates API documentation for Rails in `doc/api`.
-
 ### `notes`
 
 `rake notes` will search through your code for comments beginning with FIXME, OPTIMIZE or TODO. The search is done in files with extension `.builder`, `.rb`, `.rake`, `.yml`, `.yaml`, `.ruby`, `.css`, `.js` and `.erb` for both default and custom annotations.
diff --git a/guides/source/getting_started.md b/guides/source/getting_started.md
index 31f2d2ed2f..ee742a0db7 100644
--- a/guides/source/getting_started.md
+++ b/guides/source/getting_started.md
@@ -2054,19 +2054,6 @@ resources:
 * The [Ruby on Rails mailing list](http://groups.google.com/group/rubyonrails-talk)
 * The [#rubyonrails](irc://irc.freenode.net/#rubyonrails) channel on irc.freenode.net
 
-Rails also comes with built-in help that you can generate using the rake
-command-line utility:
-
-* Running `rake doc:guides` will put a full copy of the Rails Guides in the
-  `doc/guides` folder of your application. Open `doc/guides/index.html` in your
-  web browser to explore the Guides.
-* Running `rake doc:rails` will put a full copy of the API documentation for
-  Rails in the `doc/api` folder of your application. Open `doc/api/index.html`
-  in your web browser to explore the API documentation.
-
-TIP: To be able to generate the Rails Guides locally with the `doc:guides` rake
-task you need to install the Redcarpet and Nokogiri gems. Add it to your `Gemfile` and run
-`bundle install` and you're ready to go.
 
 Configuration Gotchas
 ---------------------
diff --git a/rails.gemspec b/rails.gemspec
index b3143e6fe1..1398169922 100644
--- a/rails.gemspec
+++ b/rails.gemspec
@@ -16,7 +16,7 @@ Gem::Specification.new do |s|
   s.email    = 'david@loudthinking.com'
   s.homepage = 'http://www.rubyonrails.org'
 
-  s.files = ['README.md'] + Dir['guides/**/*'] - Dir['guides/output/**/*']
+  s.files = ['README.md']
 
   s.add_dependency 'activesupport', version
   s.add_dependency 'actionpack',    version
diff --git a/railties/CHANGELOG.md b/railties/CHANGELOG.md
index a3f24f854d..8c536982fc 100644
--- a/railties/CHANGELOG.md
+++ b/railties/CHANGELOG.md
@@ -1,3 +1,7 @@
+*   Remove the documentation tasks `doc:app`, `doc:rails`, and `doc:guides`.
+
+    *Xavier Noria*
+
 *   Force generated routes to be inserted into routes.rb
 
     *Andrew White*
diff --git a/railties/lib/rails/api/task.rb b/railties/lib/rails/api/task.rb
index 4d49244807..a082932632 100644
--- a/railties/lib/rails/api/task.rb
+++ b/railties/lib/rails/api/task.rb
@@ -152,19 +152,5 @@ module Rails
         File.read('RAILS_VERSION').strip
       end
     end
-
-    class AppTask < Task
-      def component_root_dir(gem_name)
-        $:.grep(%r{#{gem_name}[\w.-]*/lib\z}).first[0..-5]
-      end
-
-      def api_dir
-        'doc/api'
-      end
-
-      def rails_version
-        Rails::VERSION::STRING
-      end
-    end
   end
 end
diff --git a/railties/lib/rails/generators/app_base.rb b/railties/lib/rails/generators/app_base.rb
index 057c8b0aec..253272c7dd 100644
--- a/railties/lib/rails/generators/app_base.rb
+++ b/railties/lib/rails/generators/app_base.rb
@@ -113,7 +113,6 @@ module Rails
          assets_gemfile_entry,
          javascript_gemfile_entry,
          jbuilder_gemfile_entry,
-         sdoc_gemfile_entry,
          psych_gemfile_entry,
          @extra_entries].flatten.find_all(&@gem_filter)
       end
@@ -265,11 +264,6 @@ module Rails
         GemfileEntry.version('jbuilder', '~> 2.0', comment)
       end
 
-      def sdoc_gemfile_entry
-        comment = 'bundle exec rake doc:rails generates the API under doc/api.'
-        GemfileEntry.new('sdoc', '~> 0.4.0', comment, group: :doc)
-      end
-
       def coffee_gemfile_entry
         comment = 'Use CoffeeScript for .coffee assets and views'
         if options.dev? || options.edge?
diff --git a/railties/lib/rails/generators/rails/app/templates/README.rdoc b/railties/lib/rails/generators/rails/app/templates/README.rdoc
index dd4e97e22e..db0fbe031b 100644
--- a/railties/lib/rails/generators/rails/app/templates/README.rdoc
+++ b/railties/lib/rails/generators/rails/app/templates/README.rdoc
@@ -22,7 +22,3 @@ Things you may want to cover:
 * Deployment instructions
 
 * ...
-
-
-Please feel free to use a different markup language if you do not plan to run
-<tt>rake doc:app</tt>.
diff --git a/railties/lib/rails/tasks/documentation.rake b/railties/lib/rails/tasks/documentation.rake
deleted file mode 100644
index 8544890553..0000000000
--- a/railties/lib/rails/tasks/documentation.rake
+++ /dev/null
@@ -1,70 +0,0 @@
-begin
-  require 'rdoc/task'
-rescue LoadError
-  # Rubinius installs RDoc as a gem, and for this interpreter "rdoc/task" is
-  # available only if the application bundle includes "rdoc" (normally as a
-  # dependency of the "sdoc" gem.)
-  #
-  # If RDoc is not available it is fine that we do not generate the tasks that
-  # depend on it. Just be robust to this gotcha and go on.
-else
-  require 'rails/api/task'
-
-  # Monkey-patch to remove redoc'ing and clobber descriptions to cut down on rake -T noise
-  class RDocTaskWithoutDescriptions < RDoc::Task
-    include ::Rake::DSL
-
-    def define
-      task rdoc_task_name
-
-      task rerdoc_task_name => [clobber_task_name, rdoc_task_name]
-
-      task clobber_task_name do
-        rm_r rdoc_dir rescue nil
-      end
-
-      task :clobber => [clobber_task_name]
-
-      directory @rdoc_dir
-      task rdoc_task_name => [rdoc_target]
-      file rdoc_target => @rdoc_files + [Rake.application.rakefile] do
-        rm_r @rdoc_dir rescue nil
-        @before_running_rdoc.call if @before_running_rdoc
-        args = option_list + @rdoc_files
-        if @external
-          argstring = args.join(' ')
-          sh %{ruby -Ivendor vendor/rd #{argstring}}
-        else
-          require 'rdoc/rdoc'
-          RDoc::RDoc.new.document(args)
-        end
-      end
-      self
-    end
-  end
-
-  namespace :doc do
-    RDocTaskWithoutDescriptions.new("app") { |rdoc|
-      rdoc.rdoc_dir = 'doc/app'
-      rdoc.template = ENV['template'] if ENV['template']
-      rdoc.title    = ENV['title'] || "Rails Application Documentation"
-      rdoc.options << '--line-numbers'
-      rdoc.options << '--charset' << 'utf-8'
-      rdoc.rdoc_files.include('README.rdoc')
-      rdoc.rdoc_files.include('app/**/*.rb')
-      rdoc.rdoc_files.include('lib/**/*.rb')
-    }
-    Rake::Task['doc:app'].comment = "Generate docs for the app -- also available doc:rails, doc:guides (options: TEMPLATE=/rdoc-template.rb, TITLE=\"Custom Title\")"
-
-    # desc 'Generate documentation for the Rails framework.'
-    Rails::API::AppTask.new('rails')
-  end
-end
-
-namespace :doc do
-  task :guides do
-    rails_gem_dir = Gem::Specification.find_by_name("rails").gem_dir
-    require File.expand_path(File.join(rails_gem_dir, "/guides/rails_guides"))
-    RailsGuides::Generator.new(Rails.root.join("doc/guides")).generate
-  end
-end
diff --git a/railties/test/generators/app_generator_test.rb b/railties/test/generators/app_generator_test.rb
index 689173f184..8cef40b151 100644
--- a/railties/test/generators/app_generator_test.rb
+++ b/railties/test/generators/app_generator_test.rb
@@ -417,11 +417,6 @@ class AppGeneratorTest < Rails::Generators::TestCase
     end
   end
 
-  def test_inclusion_of_doc
-    run_generator
-    assert_file 'Gemfile', /gem 'sdoc',\s+'~> 0.4.0',\s+group: :doc/
-  end
-
   def test_template_from_dir_pwd
     FileUtils.cd(Rails.root)
     assert_match(/It works from file!/, run_generator([destination_root, "-m", "lib/template.rb"]))