Add support for cargo ecosystem metrics collection

cargo/lib/dependabot/cargo/file_parser.rb

@@ -11,6 +11,8 @@
 require "dependabot/cargo/version"
 require "dependabot/errors"
 require "dependabot/cargo/registry_fetcher"
+require "dependabot/cargo/language"
+require "dependabot/cargo/package_manager"
 
 # Relevant Cargo docs can be found at:
 # - https://doc.rust-lang.org/cargo/reference/manifest.html
@@ -42,8 +44,50 @@ def parse
         end
       end
 
+      sig { returns(Ecosystem) }
+      def ecosystem
+        @ecosystem ||= T.let(begin
+          Ecosystem.new(
+            name: ECOSYSTEM,
+            package_manager: package_manager,
+            language: language
+          )
+        end, T.nilable(Dependabot::Ecosystem))
+      end
+
       private
 
+      sig { returns(Ecosystem::VersionManager) }
+      def package_manager
+        @package_manager ||= T.let(
+          PackageManager.new(T.must(cargo_version)),
+          T.nilable(Dependabot::Cargo::PackageManager)
+        )
+      end
+
+      sig { returns(T.nilable(Ecosystem::VersionManager)) }
+      def language
+        @language ||= T.let(begin
+          Language.new(T.must(rust_version))
+        end, T.nilable(Dependabot::Cargo::Language))
+      end
+
+      sig { returns(T.nilable(String)) }
+      def rust_version
+        @rust_version ||= T.let(begin
+          version = SharedHelpers.run_shell_command("rustc --version")
+          version.match(/rustc\s*(\d+\.\d+(.\d+)*)/)&.captures&.first
+        end, T.nilable(String))
+      end
+
+      sig { returns(T.nilable(String)) }
+      def cargo_version
+        @cargo_version ||= T.let(begin
+          version = SharedHelpers.run_shell_command("cargo --version")
+          version.match(/cargo\s*(\d+\.\d+(.\d+)*)/)&.captures&.first
+        end, T.nilable(String))
+      end
+
       def check_rust_workspace_root
         cargo_toml = dependency_files.find { |f| f.name == "Cargo.toml" }
         workspace_root = parsed_file(cargo_toml).dig("package", "workspace")

cargo/lib/dependabot/cargo/language.rb

@@ -0,0 +1,24 @@
+# typed: strong
+# frozen_string_literal: true
+
+require "sorbet-runtime"
+require "dependabot/ecosystem"
+require "dependabot/cargo/version"
+
+module Dependabot
+  module Cargo
+    LANGUAGE = "rust"
+
+    class Language < Dependabot::Ecosystem::VersionManager
+      extend T::Sig
+
+      sig { params(raw_version: String).void }
+      def initialize(raw_version)
+        super(
+          LANGUAGE,
+          Version.new(raw_version)
+        )
+      end
+    end
+  end
+end

cargo/lib/dependabot/cargo/package_manager.rb

@@ -0,0 +1,41 @@
+# typed: strong
+# frozen_string_literal: true
+
+require "sorbet-runtime"
+require "dependabot/ecosystem"
+require "dependabot/cargo/version"
+
+module Dependabot
+  module Cargo
+    ECOSYSTEM = "rust"
+    PACKAGE_MANAGER = "cargo"
+    SUPPORTED_CARGO_VERSIONS = T.let([].freeze, T::Array[Dependabot::Version])
+
+    # When a version is going to be unsupported, it will be added here
+    DEPRECATED_CARGO_VERSIONS = T.let([].freeze, T::Array[Dependabot::Version])
+
+    class PackageManager < Dependabot::Ecosystem::VersionManager
+      extend T::Sig
+
+      sig { params(raw_version: String).void }
+      def initialize(raw_version)
+        super(
+          PACKAGE_MANAGER,
+          Version.new(raw_version),
+          DEPRECATED_CARGO_VERSIONS,
+          SUPPORTED_CARGO_VERSIONS
+        )
+      end
+
+      sig { returns(T::Boolean) }
+      def deprecated?
+        false
+      end
+
+      sig { returns(T::Boolean) }
+      def unsupported?
+        false
+      end
+    end
+  end
+end

cargo/spec/dependabot/cargo/file_parser_spec.rb

@@ -854,4 +854,32 @@
       end
     end
   end
+
+  describe "#ecosystem" do
+    subject(:ecosystem) { parser.ecosystem }
+
+    it "has the correct name" do
+      expect(ecosystem.name).to eq "rust"
+    end
+
+    describe "#package_manager" do
+      subject(:package_manager) { ecosystem.package_manager }
+
+      it "returns the correct package manager" do
+        expect(package_manager.name).to eq "cargo"
+        expect(package_manager.requirement).to be_nil
+        expect(package_manager.version.to_s).to eq "1.82.0"
+      end
+    end
+
+    describe "#language" do
+      subject(:language) { ecosystem.language }
+
+      it "returns the correct language" do
+        expect(language.name).to eq "rust"
+        expect(language.requirement).to be_nil
+        expect(language.version.to_s).to eq "1.82.0"
+      end
+    end
+  end
 end

cargo/spec/dependabot/cargo/language_spec.rb

@@ -0,0 +1,35 @@
+# typed: false
+# frozen_string_literal: true
+
+require "dependabot/cargo/language"
+require "dependabot/ecosystem"
+require "spec_helper"
+
+RSpec.describe Dependabot::Cargo::Language do
+  let(:language) { described_class.new(version) }
+  let(:version) { "3.0.0" }
+
+  describe "#version" do
+    it "returns the version" do
+      expect(language.version).to eq(Dependabot::Cargo::Version.new(version))
+    end
+  end
+
+  describe "#name" do
+    it "returns the name" do
+      expect(language.name).to eq(Dependabot::Cargo::LANGUAGE)
+    end
+  end
+
+  describe "#unsupported?" do
+    it "returns false by default" do
+      expect(language.unsupported?).to be false
+    end
+  end
+
+  describe "#deprecated?" do
+    it "returns false by default" do
+      expect(language.deprecated?).to be false
+    end
+  end
+end

cargo/spec/dependabot/cargo/package_manager_spec.rb

@@ -0,0 +1,36 @@
+# typed: false
+# frozen_string_literal: true
+
+require "dependabot/cargo/package_manager"
+require "dependabot/ecosystem"
+require "spec_helper"
+
+RSpec.describe Dependabot::Cargo::PackageManager do
+  subject(:package_manager) { described_class.new(version) }
+
+  let(:version) { "1.12" }
+
+  describe "#version" do
+    it "returns the version" do
+      expect(package_manager.version).to eq(Dependabot::Cargo::Version.new(version))
+    end
+  end
+
+  describe "#name" do
+    it "returns the name" do
+      expect(package_manager.name).to eq(Dependabot::Cargo::PACKAGE_MANAGER)
+    end
+  end
+
+  describe "#deprecated_versions" do
+    it "returns deprecated versions" do
+      expect(package_manager.deprecated_versions).to eq(Dependabot::Cargo::DEPRECATED_CARGO_VERSIONS)
+    end
+  end
+
+  describe "#supported_versions" do
+    it "returns supported versions" do
+      expect(package_manager.supported_versions).to eq(Dependabot::Cargo::SUPPORTED_CARGO_VERSIONS)
+    end
+  end
+end