Reuse common error methods in dry-run script

bin/dry-run.rb

@@ -402,101 +402,26 @@ def fetch_files(fetcher)
     end
   end
 rescue StandardError => e
-  error_details = handle_dependabot_error(error: e)
+  error_details = Dependabot.fetcher_error_details(e)
+  raise unless error_details
 
   puts " => handled error whilst fetching dependencies: #{error_details.fetch(:"error-type")} " \
        "#{error_details.fetch(:"error-detail")}"
 
   []
 end
 
-# rubocop:disable Metrics/MethodLength
-def handle_dependabot_error(error:)
-  case error
-  when Dependabot::DependencyFileNotResolvable
-    {
-      "error-type": "dependency_file_not_resolvable",
-      "error-detail": { message: error.message }
-    }
-  when Dependabot::DependencyFileNotEvaluatable
-    {
-      "error-type": "dependency_file_not_evaluatable",
-      "error-detail": { message: error.message }
-    }
-  when Dependabot::BranchNotFound
-    {
-      "error-type": "branch_not_found",
-      "error-detail": { "branch-name": error.branch_name }
-    }
-  when Dependabot::DirectoryNotFound
-    {
-      "error-type": "directory_not_found",
-      "error-detail": { "directory-name": error.directory_name }
-    }
-  when Dependabot::DependencyFileNotParseable
-    {
-      "error-type": "dependency_file_not_parseable",
-      "error-detail": {
-        message: error.message,
-        "file-path": error.file_path
-      }
-    }
-  when Dependabot::DependencyFileNotFound
-    {
-      "error-type": "dependency_file_not_found",
-      "error-detail": { "file-path": error.file_path }
-    }
-  when Dependabot::PathDependenciesNotReachable
-    {
-      "error-type": "path_dependencies_not_reachable",
-      "error-detail": { dependencies: error.dependencies }
-    }
-  when Dependabot::GitDependenciesNotReachable
-    {
-      "error-type": "git_dependencies_not_reachable",
-      "error-detail": { "dependency-urls": error.dependency_urls }
-    }
-  when Dependabot::GitDependencyReferenceNotFound
-    {
-      "error-type": "git_dependency_reference_not_found",
-      "error-detail": { dependency: error.dependency }
-    }
-  when Dependabot::PrivateSourceAuthenticationFailure
-    {
-      "error-type": "private_source_authentication_failure",
-      "error-detail": { source: error.source }
-    }
-  when Dependabot::PrivateSourceTimedOut
-    {
-      "error-type": "private_source_timed_out",
-      "error-detail": { source: error.source }
-    }
-  when Dependabot::PrivateSourceCertificateFailure
-    {
-      "error-type": "private_source_certificate_failure",
-      "error-detail": { source: error.source }
-    }
-  when Dependabot::MissingEnvironmentVariable
-    {
-      "error-type": "missing_environment_variable",
-      "error-detail": {
-        "environment-variable": error.environment_variable
-      }
-    }
-  when Dependabot::GoModulePathMismatch
-    {
-      "error-type": "go_module_path_mismatch",
-      "error-detail": {
-        "declared-path": error.declared_path,
-        "discovered-path": error.discovered_path,
-        "go-mod": error.go_mod
-      }
-    }
-  else
-    raise
-  end
+def parse_dependencies(parser)
+  cached_read("dependencies") { parser.parse }
+rescue StandardError => e
+  error_details = Dependabot.parser_error_details(e)
+  raise unless error_details
+
+  puts " => handled error whilst parsing dependencies: #{error_details.fetch(:"error-type")} " \
+       "#{error_details.fetch(:"error-detail")}"
+
+  []
 end
-# rubocop:enable Metrics/MethodLength
 
 def log_conflicting_dependencies(conflicting_dependencies)
   return unless conflicting_dependencies.any?
@@ -568,7 +493,7 @@ def log_conflicting_dependencies(conflicting_dependencies)
   reject_external_code: $options[:reject_external_code]
 )
 
-dependencies = cached_read("dependencies") { parser.parse }
+dependencies = parse_dependencies(parser)
 
 if $options[:dependency_names].nil?
   dependencies.select!(&:top_level?)
@@ -810,7 +735,8 @@ def security_fix?(dependency)
     puts "--commit--\n#{msg.commit_message}\n--/commit--"
   end
 rescue StandardError => e
-  error_details = handle_dependabot_error(error: e)
+  error_details = Dependabot.updater_error_details(e)
+  raise unless error_details
 
   puts " => handled error whilst updating #{dep.name}: #{error_details.fetch(:"error-type")} " \
        "#{error_details.fetch(:"error-detail")}"