Add language info pages

- Add presenter for language info pages
- Add route for languages info pages
- Add view for language info pages
- Change links in language menu to language info pages
- Add test suite for presenter
- Fix error in routes
- Make tests pass for track_problems
- Edit tracks_test.rb so that it tests methods fom sample data and not pull from API, which were making the tests fail when tracks_test.rb was run on its own.
- Add template for individual language landing pages.
- Debug route, add to routes file
- Add route for language template page to lib/app/route.rb and lib/app.rb
- Catch fake language exception
- Add styling to language info page
- Create problems_test.rb file.
- Remove commented out initialize method for class
- Remove extra lines from languages_test.rb
- Add tests and relevant files for track_id and track_problems.
- Add require_relative '../../api_helper.rb', require_relative '../../app_helper.rb' and include DBCleaner to test/app/presenters/problems_test.rb
- Remove extra spaces from languages.rb
- Change wording for track_problems test
- Add links to problem READMEs from language info page
- Add test for fetch_all_problems method in problems presenter.
- Remove commented out method and test.
- Remove old routes debugging
- Remove blank space in routes/languages.rb
- Remove blank space in routes.rb
- Remove duplication in routes

lib/app.rb

@@ -13,6 +13,7 @@
 require_relative './app/presenters/profile'
 require_relative './app/presenters/sharing'
 require_relative './exercism/xapi'
+require_relative './app/presenters/problems'
 
 require_relative './app/helpers'
 require_relative './app/helpers/gravatar_helper'
@@ -34,6 +35,7 @@ class App < Sinatra::Base
       register Sinatra::Reloader
     end
 
+    use Routes::Languages
     use Routes::Static
     use Routes::Legacy
     use Routes::Main

lib/app/presenters/problems.rb

@@ -0,0 +1,51 @@
+require 'json'
+
+module ExercismWeb
+	module Presenters
+    module Special
+    	class Problem < OpenStruct
+    	end
+
+    	class Problems
+        def initialize(track_id)
+          @track_id = track_id
+        end
+
+        def track_id
+          @track_id
+        end
+
+    		def all_problems
+    			@all_problems ||= fetch_all_problems
+    		end
+
+        def track_problems
+          @track_problems ||= problems_hash
+        end
+
+  			def fetch_all_problems
+  				status, body = Xapi.get("problems")
+  	    	if status != 200
+  	    		raise "something fishy in x-api: (#{status}) - #{body}"
+  	    	end
+  	    	JSON.parse(body)["problems"]
+  			end
+
+  			def problems_hash
+  				@track_problems = []
+  		    all_problems.each do |problem|
+        		slug = problem["slug"]
+        		if problem["track_ids"].include?(track_id)
+              @track_problems << {
+                :slug => slug,
+    	    			:blurb => problem["blurb"],
+    	    			:name => slug.split('-').map(&:capitalize).join(' ')
+    	    			}
+            end
+    			end
+  			  @track_problems.map {|problem| Problem.new(problem)}
+  			end
+      end
+    end
+  end
+end

lib/app/routes.rb

@@ -2,6 +2,7 @@ module ExercismWeb
   module Routes
     {
       Core: 'core',
+      Languages: 'languages',
       Legacy: 'legacy',
       Main: 'main',
       OnboardingSteps: 'onboarding_steps',
@@ -11,7 +12,6 @@ module Routes
       Account: 'account',
       Backdoor: 'backdoor',
       Sessions: 'sessions',
-      GithubCallback: 'github_callback',
       Notifications: 'notifications',
       Looks: 'looks',
       Solutions: 'solutions',
@@ -21,11 +21,12 @@ module Routes
       Metadata: 'metadata',
       Teams: 'teams',
       Styleguide: 'styleguide',
-      User: 'user',
       CommentThreads: 'comment_threads',
       Errors: 'errors',
+      User: 'user',
+      GithubCallback: 'github_callback'
     }.each do |name, file|
       autoload name, Exercism.relative_to_root('lib', 'app', 'routes', file)
     end
   end
-end
+end

lib/app/routes/account.rb

@@ -20,4 +20,4 @@ class Account < Core
       end
     end
   end
-end
+end

lib/app/routes/languages.rb

@@ -0,0 +1,27 @@
+require 'app/presenters/problems'
+
+module ExercismWeb
+	module Routes
+		class Languages < Core
+      get '/languages/:track_id' do |track_id|
+        begin
+          active = ExercismWeb::Presenters::Tracks.find(track_id.to_s).active?
+          exists = true
+        rescue Exception => e
+          Bugsnag.notify(e)
+          "#{track_id} is not a language"
+          exists = false
+        end
+
+				locals = {
+          problems: Presenters::Special::Problems.new(track_id).track_problems,
+		      language: Language.of(track_id),
+          slug: track_id,
+          active: active,
+          exists: exists
+			    }
+        erb :"languages/languages", locals: locals
+			end
+		end
+	end
+end

lib/app/views/application/_nav.erb

@@ -6,20 +6,18 @@
     <% end %>
     <li class="dropdown">
       <a class="dropdown-toggle" id="drop-current" href="#" data-toggle="dropdown">Languages<b class="caret"></b></a>
-      <ul class="dropdown-menu" id="menu-current" role="menu" area-labelledby="drop-current">
-        <% tracks.each do |t| %>
-          <% if t.active? %>
-            <li>
-              <a role="menuitem" tabindex="-1" href="http://help.exercism.io/getting-started-with-<%= t.slug %>.html">
-                <%= t.language %>
-              </a>
-            </li>
-          <% end %>
+    <ul class="dropdown-menu" id="menu-current" role="menu" area-labelledby="drop-current">
+      <% tracks.each do |t| %>
+        <% if t.active? %>
+          <li>
+            <a role="menuitem" tabindex="-1" href="/languages/<%= t.slug %>">
+              <%= t.language %>
+            </a>
+          </li>
         <% end %>
-      </ul>
+      <% end %>
+    </ul>
     </li>
-
-
   </ul>
 
   <ul class="nav navbar-nav navbar-right">

lib/app/views/languages/languages.erb

@@ -0,0 +1,26 @@
+<div class="container getting-started">
+	<section class="page-header">
+		<h1><%= language %></h1>
+	</section>
+	<% if active %>
+		<article class="article-block">
+			<div class="article-contents">
+				<h2 class="header">Available Exercises</h2>
+				<% problems.each do |problem| %>
+					<h5><a href="/exercises/<%= slug %>/<%= problem.slug %>/readme"><%= problem.name %></a></h5>
+						<p><%= problem.blurb %></p>
+				<% end %>
+			</div>
+		</article>
+		<article class="article-block">
+			<div class="article-contents">
+				<h2 class="header">Getting Started</h2>
+				<p>Need help getting started? You can find install documentation and resources for <%= language %> <a href="http://help.exercism.io/getting-started-with-<%= slug %>.html">here</a>.</p>
+			</div>
+		</article>
+	<% elsif exists %>
+		<h3>We're still working on <%= language %>. <a href="https://github.com/exercism/x<%= slug %>">Want to help us out?</a></h3>
+	<% else %>
+		<h3>If you'd like to see exercises in this language, <a href="https://github.com/exercism/exercism.io/issues/new">let us know.</a></h3>
+	<% end %>
+</div>

lib/exercism/problem.rb

@@ -12,4 +12,4 @@ def language
   def in?(other_track_id)
     track_id == other_track_id
   end
-end
+end

test/app/presenters/languages_test.rb

@@ -14,4 +14,3 @@ def test_more_languages
     assert_equal "Python, Scala, and Go", ExercismWeb::Presenters::Languages.new(['Python', 'Scala', 'Go']).to_s
   end
 end
-

test/app/presenters/problems_test.rb

@@ -0,0 +1,49 @@
+require_relative '../../test_helper'
+require_relative '../../app_presenters_helper'
+require_relative '../../api_helper'
+require 'mocha/setup'
+require 'app/presenters/problems'
+require_relative '../../api_helper.rb'
+require_relative '../../app_helper.rb'
+
+class PresentersProblemsTest < Minitest::Test
+	include Rack::Test::Methods
+	include DBCleaner
+
+	def app
+		ExercismWeb::App
+	end
+
+	def test_knows_its_track_id
+		track = ExercismWeb::Presenters::Special::Problems.new("ruby")
+		assert_equal "ruby", track.track_id
+	end
+
+	def all_problems_json
+		File.read("./test/fixtures/approvals/api_all_problems.approved.json")
+	end
+
+	def test_that_fetch_all_problems_can_get_all_problems
+		Xapi.stub(:get, [200, all_problems_json]) do
+			get '/problems'
+			problems = ExercismWeb::Presenters::Special::Problems.new('ruby')
+			assert_includes problems.fetch_all_problems.to_s, '"slug"=>"zipper"'
+		end
+	end
+
+	def test_can_return_problems_for_specific_track
+  	Xapi.stub(:get, [200, all_problems_json]) do
+  		get '/languages/ruby'
+  	  problems = ExercismWeb::Presenters::Special::Problems.new('ruby')
+  	  assert_includes problems.track_problems.to_s, "Write a program that implements a binary search algorithm."
+  	end
+  end
+
+  def test_does_not_return_problems_not_in_specific_track
+  	Xapi.stub(:get, [200, all_problems_json]) do
+  		get '/languages/ruby'
+  	  problems = ExercismWeb::Presenters::Special::Problems.new('ruby')
+			refute_includes problems.track_problems.to_s, "Compute the result for a game of Hex / Polygon"
+		end
+  end
+end

test/app/presenters/tracks_test.rb

@@ -1,4 +1,5 @@
 require_relative '../../test_helper'
+require_relative '../../tracks_helper'
 require 'app/presenters/tracks'
 require 'exercism/xapi.rb'
 require 'faraday'

test/app_presenters_helper.rb

@@ -0,0 +1,11 @@
+module AppPresentersHelper
+	def all_problems_json
+		problems_file = File.expand_path('../fixtures/approvals/api_all_problems.approved.json', __FILE__)
+    File.read(problems_file)
+	end
+
+  def ruby_track_problems_array
+    array_file = File.expand_path('../fixtures/approvals/ruby_track_problems.approved.txt', __FILE__)
+    File.read(array_file)
+  end
+end