Add auxiliary blob viewers to dependency files

app/models/blob.rb

@@ -42,7 +42,19 @@ class Blob < SimpleDelegator
     BlobViewer::License,
     BlobViewer::Contributing,
-    BlobViewer::Changelog
+    BlobViewer::Changelog,
+
+    BlobViewer::Cartfile,
+    BlobViewer::ComposerJson,
+    BlobViewer::Gemfile,
+    BlobViewer::Gemspec,
+    BlobViewer::GodepsJson,
+    BlobViewer::PackageJson,
+    BlobViewer::Podfile,
+    BlobViewer::Podspec,
+    BlobViewer::PodspecJson,
+    BlobViewer::RequirementsTxt,
+    BlobViewer::YarnLock
   ].freeze
   attr_reader :project

app/models/blob_viewer/cartfile.rb

+module BlobViewer
+  class Cartfile < DependencyManager
+    include Static
+
+    self.file_types = %i(cartfile)
+
+    def manager_name
+      'Carthage'
+    end
+
+    def manager_url
+      'https://github.com/Carthage/Carthage'
+    end
+  end
+end

app/models/blob_viewer/composer_json.rb

+module BlobViewer
+  class ComposerJson < DependencyManager
+    include ServerSide
+
+    self.file_types = %i(composer_json)
+
+    def manager_name
+      'Composer'
+    end
+
+    def manager_url
+      'https://getcomposer.com/'
+    end
+
+    def package_name
+      @package_name ||= package_name_from_json('name')
+    end
+
+    def package_url
+      "https://packagist.org/packages/#{package_name}"
+    end
+  end
+end

app/models/blob_viewer/dependency_manager.rb

+module BlobViewer
+  class DependencyManager < Base
+    include Auxiliary
+
+    self.partial_name = 'dependency_manager'
+    self.binary = false
+
+    def manager_name
+      raise NotImplementedError
+    end
+
+    def manager_url
+      raise NotImplementedError
+    end
+
+    def package_type
+      'package'
+    end
+
+    def package_name
+      nil
+    end
+
+    def package_url
+      nil
+    end
+
+    private
+
+    def package_name_from_json(key)
+      prepare!
+
+      JSON.parse(blob.data)[key] rescue nil
+    end
+
+    def package_name_from_method_call(name)
+      prepare!
+
+      match = blob.data.match(/#{name}\s*=\s*["'](?<name>[^"']+)["']/)
+      match[:name] if match
+    end
+  end
+end

app/models/blob_viewer/gemfile.rb

+module BlobViewer
+  class Gemfile < DependencyManager
+    include Static
+
+    self.file_types = %i(gemfile gemfile_lock)
+
+    def manager_name
+      'Bundler'
+    end
+
+    def manager_url
+      'http://bundler.io/'
+    end
+  end
+end

app/models/blob_viewer/gemspec.rb

+module BlobViewer
+  class Gemspec < DependencyManager
+    include ServerSide
+
+    self.file_types = %i(gemspec)
+
+    def manager_name
+      'RubyGems'
+    end
+
+    def manager_url
+      'https://rubygems.org/'
+    end
+
+    def package_type
+      'gem'
+    end
+
+    def package_name
+      @package_name ||= package_name_from_method_call('name')
+    end
+
+    def package_url
+      "https://rubygems.org/gems/#{package_name}"
+    end
+  end
+end

app/models/blob_viewer/godeps_json.rb

+module BlobViewer
+  class GodepsJson < DependencyManager
+    include Static
+
+    self.file_types = %i(godeps_json)
+
+    def manager_name
+      'godep'
+    end
+
+    def manager_url
+      'https://github.com/tools/godep'
+    end
+  end
+end

app/models/blob_viewer/package_json.rb

+module BlobViewer
+  class PackageJson < DependencyManager
+    include ServerSide
+
+    self.file_types = %i(package_json)
+
+    def manager_name
+      'npm'
+    end
+
+    def manager_url
+      'https://www.npmjs.com/'
+    end
+
+    def package_name
+      @package_name ||= package_name_from_json('name')
+    end
+
+    def package_url
+      "https://www.npmjs.com/package/#{package_name}"
+    end
+  end
+end

app/models/blob_viewer/podfile.rb

+module BlobViewer
+  class Podfile < DependencyManager
+    include Static
+
+    self.file_types = %i(podfile)
+
+    def manager_name
+      'CocoaPods'
+    end
+
+    def manager_url
+      'https://cocoapods.org/'
+    end
+  end
+end

app/models/blob_viewer/podspec.rb

+module BlobViewer
+  class Podspec < DependencyManager
+    include ServerSide
+
+    self.file_types = %i(podspec)
+
+    def manager_name
+      'CocoaPods'
+    end
+
+    def manager_url
+      'https://cocoapods.org/'
+    end
+
+    def package_type
+      'pod'
+    end
+
+    def package_name
+      @package_name ||= package_name_from_method_call('name')
+    end
+
+    def package_url
+      "https://cocoapods.org/pods/#{package_name}"
+    end
+  end
+end

app/models/blob_viewer/podspec_json.rb

+module BlobViewer
+  class PodspecJson < Podspec
+    self.file_types = %i(podspec_json)
+
+    def package_name
+      @package_name ||= package_name_from_json('name')
+    end
+  end
+end

app/models/blob_viewer/requirements_txt.rb

+module BlobViewer
+  class RequirementsTxt < DependencyManager
+    include Static
+
+    self.file_types = %i(requirements_txt)
+
+    def manager_name
+      'pip'
+    end
+
+    def manager_url
+      'https://pip.pypa.io/'
+    end
+  end
+end

app/models/blob_viewer/yarn_lock.rb

+module BlobViewer
+  class YarnLock < DependencyManager
+    include Static
+
+    self.file_types = %i(yarn_lock)
+
+    def manager_name
+      'Yarn'
+    end
+
+    def manager_url
+      'https://yarnpkg.com/'
+    end
+  end
+end

app/views/projects/blob/viewers/_dependency_manager.html.haml

+= icon('cubes fw')
+= succeed '.' do
+  This project manages its dependencies using
+  %strong= viewer.manager_name
+
+  - if viewer.package_name
+    and defines a #{viewer.package_type} named
+    %strong<
+      = link_to viewer.package_name, viewer.package_url, target: '_blank', rel: 'noopener noreferrer'
+
+= link_to 'Learn more', viewer.manager_url, target: '_blank', rel: 'noopener noreferrer'

app/views/projects/blob/viewers/_license.html.haml

@@ -5,4 +5,4 @@ This project is licensed under the
 = succeed '.' do
   %strong= license.name
-= link_to 'Learn more about this license', license.url, target: '_blank', rel: 'noopener noreferrer'
+= link_to 'Learn more', license.url, target: '_blank', rel: 'noopener noreferrer'

app/views/projects/blob/viewers/_loading_auxiliary.html.haml

 = icon('spinner spin fw')
-Loading…
+Analyzing file…

lib/gitlab/file_detector.rb

@@ -5,17 +5,33 @@ module Gitlab
   # a README or a CONTRIBUTING file.
   module FileDetector
     PATTERNS = {
+      # Project files
       readme: /\Areadme/i,
       changelog: /\A(changelog|history|changes|news)/i,
       license: /\A(licen[sc]e|copying)(\..+|\z)/i,
       contributing: /\Acontributing/i,
       version: 'version',
+      avatar: /\Alogo\.(png|jpg|gif)\z/,
+
+      # Configuration files
       gitignore: '.gitignore',
       koding: '.koding.yml',
-      gemfile: /\A(Gemfile|gems\.rb)\z/,
       gitlab_ci: '.gitlab-ci.yml',
-      avatar: /\Alogo\.(png|jpg|gif)\z/,
-      route_map: 'route-map.yml'
+      route_map: 'route-map.yml',
+
+      # Dependency files
+      cartfile: /\ACartfile/,
+      composer_json: 'composer.json',
+      gemfile: /\A(Gemfile|gems\.rb)\z/,
+      gemfile_lock: 'Gemfile.lock',
+      gemspec: /\.gemspec\z/,
+      godeps_json: 'Godeps.json',
+      package_json: 'package.json',
+      podfile: 'Podfile',
+      podspec_json: /\.podspec\.json\z/,
+      podspec: /\.podspec\z/,
+      requirements_txt: /requirements\.txt\z/,
+      yarn_lock: 'yarn.lock'
     }.freeze
     # Returns an Array of file types based on the given paths.

spec/features/projects/blobs/blob_show_spec.rb

@@ -423,7 +423,43 @@ feature 'File blob', :js, feature: true do
         expect(page).to have_content('This project is licensed under the MIT License.')
         # shows a learn more link
-        expect(page).to have_link('Learn more about this license', 'http://choosealicense.com/licenses/mit/')
+        expect(page).to have_link('Learn more', 'http://choosealicense.com/licenses/mit/')
+      end
+    end
+  end
+
+  context '*.gemspec' do
+    before do
+      project.add_master(project.creator)
+
+      Files::CreateService.new(
+        project,
+        project.creator,
+        start_branch: 'master',
+        branch_name: 'master',
+        commit_message: "Add activerecord.gemspec",
+        file_path: 'activerecord.gemspec',
+        file_content: <<-SPEC.strip_heredoc
+          Gem::Specification.new do |s|
+            s.platform    = Gem::Platform::RUBY
+            s.name        = "activerecord"
+          end
+        SPEC
+      ).execute
+
+      visit_blob('activerecord.gemspec')
+    end
+
+    it 'displays an auxiliary viewer' do
+      aggregate_failures do
+        # shows license
+        expect(page).to have_content('This project manages its dependencies using RubyGems and defines a gem named activerecord.')
+
+        # shows a link to the gem
+        expect(page).to have_link('activerecord', 'https://rubygems.org/gems/activerecord')
+
+        # shows a learn more link
+        expect(page).to have_link('Learn more', 'http://choosealicense.com/licenses/mit/')
       end
     end
   end

spec/models/blob_viewer/composer_json_spec.rb

+require 'spec_helper'
+
+describe BlobViewer::ComposerJson, model: true do
+  include FakeBlobHelpers
+
+  let(:project) { build(:project) }
+  let(:data) do
+    <<-SPEC.strip_heredoc
+      {
+        "name": "laravel/laravel",
+        "homepage": "https://laravel.com/"
+      }
+    SPEC
+  end
+  let(:blob) { fake_blob(path: 'composer.json', data: data) }
+  subject { described_class.new(blob) }
+
+  describe '#package_name' do
+    it 'returns the package name' do
+      expect(subject).to receive(:prepare!)
+
+      expect(subject.package_name).to eq('laravel/laravel')
+    end
+  end
+end

spec/models/blob_viewer/gemspec_spec.rb

+require 'spec_helper'
+
+describe BlobViewer::Gemspec, model: true do
+  include FakeBlobHelpers
+
+  let(:project) { build(:project) }
+  let(:data) do
+    <<-SPEC.strip_heredoc
+      Gem::Specification.new do |s|
+        s.platform    = Gem::Platform::RUBY
+        s.name        = "activerecord"
+      end
+    SPEC
+  end
+  let(:blob) { fake_blob(path: 'activerecord.gemspec', data: data) }
+  subject { described_class.new(blob) }
+
+  describe '#package_name' do
+    it 'returns the package name' do
+      expect(subject).to receive(:prepare!)
+
+      expect(subject.package_name).to eq('activerecord')
+    end
+  end
+end