Add Gemfile.lock parsing for dependency parser

Uses Bundler gem for parsing, parses only name for now,
we should probably extract URL for repos.

Author: khasinski

lib/dependency_parser/ruby/parse.rb

@@ -0,0 +1,34 @@
+# frozen_string_literal: true
+require 'bundler'
+require 'json'
+
+module DependencyParser
+  module Ruby
+    class Parse
+      def initialize(content)
+        @content = content
+      end
+
+      def call
+        deps = Bundler::LockfileParser.new(content)
+        parsed = deps.specs.map do |spec|
+          { repos: [{ name: spec.name }], language: "ruby" }
+        end
+        JSON.pretty_generate(parsed)
+      end
+
+      private
+
+      attr_reader :content
+
+      def self.valid_gemfile?(content)
+        Bundler::LockfileParser.new(content).specs.any?
+      rescue
+        false
+      end
+    end
+  end
+end
+
+content = ARGF.read
+puts DependencyParser::Ruby::Parse.new(content).call if DependencyParser::Ruby::Parse.valid_gemfile?(content)

test/dependency_parsers/ruby_parser_test.rb

@@ -0,0 +1,40 @@
+# frozen_string_literal: true
+
+require 'test_helper'
+require_relative '../../lib/dependency_parser/ruby/parse'
+
+class UserMailerTest < ActiveSupport::TestCase
+  test "returns nothing on invalid Gemfile.lock" do
+    deps = DependencyParser::Ruby::Parse.new("invalid").call
+    assert_equal [], JSON.parse(deps)
+  end
+
+  test "returns the list of gems for a small Gemfle" do
+    gemfile_lock = <<-LOCKFILE
+GEM
+  remote: https://rubygems.org/
+  specs:
+    actioncable (6.1.4.1)
+      actionpack (= 6.1.4.1)
+      activesupport (= 6.1.4.1)
+      nio4r (~> 2.0)
+      websocket-driver (>= 0.6.1)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  actioncable
+
+RUBY VERSION
+   ruby 3.0.4p208
+
+BUNDLED WITH
+   2.3.21
+
+LOCKFILE
+
+    deps = DependencyParser::Ruby::Parse.new(gemfile_lock).call
+    assert_equal [{ "repos" => [{ "name" => "actioncable" }], "language" => "ruby" }], JSON.parse(deps)
+  end
+end