Add support of Opam package manager

app/models/package_manager/opam.rb

@@ -0,0 +1,75 @@
+module PackageManager
+  class Opam < Base
+    HAS_VERSIONS = false
+    HAS_DEPENDENCIES = false
+    BIBLIOTHECARY_SUPPORT = false
+    BIBLIOTHECARY_PLANNED = true
+    URL = 'https://opam.ocaml.org'
+    COLOR = '#3be133'
+
+    def self.project_names
+      get_html("https://opam.ocaml.org/packages/").css('tbody tr').map{|tr| tr.css('a').first.try(:text)}
+    end
+
+    def self.project(name)
+      {
+          name: name,
+          page: get_html("https://opam.ocaml.org/packages/#{name}/")
+      }
+    end
+
+    def self.mapping(project)
+      {
+          name: project[:name],
+          keywords_array: extract_keywords(project[:page]),
+          description: extract_description(project[:page]),
+          licenses: extract_licenses(project[:page]),
+          homepage: extract_homepage(project[:page]),
+          repository_url: extract_repository_url(project[:page])
+      }
+    end
+
+    def self.extract_keywords(page)
+      list_str = find_attribute(page, 'Tags')
+      list_str ? generate_list(list_str) : []
+    end
+
+    def self.extract_description(page)
+      page.css('.well h4').try(:text)
+    end
+
+    def self.extract_licenses(page)
+      find_attribute(page, 'License')
+    end
+
+    def self.extract_homepage(page)
+      find_attribute(page, 'Homepage')
+    end
+
+    def self.extract_repository_url(page)
+      repository_url = find_attribute(page, 'Issue Tracker')
+      repository_url.chomp('/issues') if repository_url
+    end
+
+    def self.find_attribute(page, name)
+      tr = page.css('.table tr').select { |t| t.css('th').text == name }.first
+      tr.css('td').text if tr
+    end
+
+    def self.generate_list(list_str)
+      list_str.split(/,\s|\sand\s/)
+    end
+
+    def self.formatted_name
+      'opam'
+    end
+
+    def self.package_link(project, _version = nil)
+      "https://opam.ocaml.org/packages/#{project}/" + (_version ? "#{project}.#{_version}" : "")
+    end
+
+    def self.install_instructions(project, version = nil)
+      "opam install #{project}" + (version ? ".#{version}" : "")
+    end
+  end
+end

lib/tasks/download.rake

@@ -197,6 +197,11 @@ namespace :download do
     PackageManager::NPM.import
   end
 
+  desc 'Download all Opam packages'
+  task opam: :environment do
+    PackageManager::Opam.import
+  end
+
   desc 'Download recent Packagist packages asynchronously'
   task packagist: :environment do
     PackageManager::Packagist.import_recent_async

spec/models/package_manager/opam_spec.rb

@@ -0,0 +1,30 @@
+require 'rails_helper'
+
+describe PackageManager::Opam do
+  let(:project) { create(:project, name: 'foo', platform: described_class.name) }
+
+  it "has formatted name of 'opam'" do
+    expect(described_class.formatted_name).to eq('opam')
+  end
+
+  describe '#package_link' do
+    it 'returns a link to project website' do
+      expect(described_class.package_link(project)).to eq("https://opam.ocaml.org/packages/foo/")
+    end
+
+    it 'handles version' do
+      expect(described_class.package_link(project, '2.0.0')).to eq("https://opam.ocaml.org/packages/foo/foo.2.0.0")
+    end
+  end
+
+  describe '#install_instructions' do
+    it 'returns a command to install the project' do
+      expect(described_class.install_instructions(project)).to eq("opam install foo")
+    end
+
+    it 'handles version' do
+      expect(described_class.install_instructions(project, '2.0.0')).to eq("opam install foo.2.0.0")
+    end
+  end
+
+end