2 files changed, 72 insertions, 1 deletions
diff --git a/lib/license/finder/ext/pip.rb b/lib/license/finder/ext/pip.rb
new file mode 100644
index 0000000..54b7d40
--- /dev/null
+++ b/lib/license/finder/ext/pip.rb
@@ -0,0 +1,69 @@
+# frozen_string_literal: true
+
+module LicenseFinder
+  class Pip
+    def current_packages
+      detected_dependencies.map do |name, version|
+        PipPackage.new(name, version, pypi.definition_for(name, version))
+      end
+    end
+
+    def possible_package_paths
+      path = project_path || Pathname.pwd
+
+      [
+        path.join(@requirements_path),
+        path.join('setup.py')
+      ]
+    end
+
+    def prepare
+      return install_packages if detected_package_path == @requirements_path
+
+      requirements_path = detected_package_path.dirname.join('requirements.txt')
+      requirements_path.write('.') unless requirements_path.exist?
+      install_packages
+    end
+
+    private
+
+    def detected_dependencies
+      stdout, _stderr, status = execute([
+        python_executable,
+        LicenseFinder::BIN_PATH.join('license_finder_pip.py'),
+        detected_package_path
+      ])
+      return [] unless status.success?
+
+      JSON.parse(stdout).map { |package| package.values_at('name', 'version') }
+    end
+
+    def install_packages
+      execute([prepare_command, "-i", pip_index_url, "-r", @requirements_path])
+    end
+
+    def execute(command)
+      Dir.chdir(project_path) do
+        ::LicenseFinder::SharedHelpers::Cmd.run(Array(command).join(' '))
+      end
+    end
+
+    def python_executable
+      "python#{@python_version == '2' ? '' : '3'}"
+    end
+
+    def pip_index_url
+      ENV.fetch('PIP_INDEX_URL', 'https://pypi.org/simple/')
+    end
+
+    def pypi
+      @pypi ||= Spandx::Python::PyPI.new(sources: [
+        Spandx::Python::Source.new({
+          'name' => 'pypi',
+          'url' => pip_index_url,
+          'verify_ssl' => true
+        })
+      ])
+    end
+  end
+end
diff --git a/lib/license/finder/ext/shared_helpers.rb b/lib/license/finder/ext/shared_helpers.rb
index bc37b9c..b6b6fcd 100644
--- a/lib/license/finder/ext/shared_helpers.rb
+++ b/lib/license/finder/ext/shared_helpers.rb
@@ -4,8 +4,10 @@ module LicenseFinder
   module SharedHelpers
     class Cmd
       def self.run(command)
+        ::License::Management.logger.debug(command)
         stdout, stderr, status = Open3.capture3(command)
-        ::License::Management.logger.debug([command, stdout].join('\n'))
+        ::License::Management.logger.debug(stdout) unless stdout.nil? || stdout.empty?
+        ::License::Management.logger.error(stderr) unless stderr.nil? || stderr.empty?
         [stdout, stderr, status]
       end
     end