Output the file path when an error occurs during analysis

Add error handling to output the path of the file being analyzed when an
exception occurs, making it easier to identify which file caused the
error.

Author: sinsoku

lib/typeprof/core/service.rb

@@ -511,6 +511,9 @@ def batch(files, output)
           output.puts "# failed to analyze: #{ file }"
           false
         end
+      rescue => e
+        output.puts "# error: #{ file }"
+        raise e
       end
       if @options[:display_indicator]
         $stderr << "\r\e[K"

test/core/service_test.rb

@@ -0,0 +1,25 @@
+require_relative "../helper"
+require "stringio"
+require "tempfile"
+
+module TypeProf::Core
+  class ServiceTest < Test::Unit::TestCase
+    def test_runtime_error
+      options = {}
+      service = TypeProf::Core::Service.new(options)
+
+      # Mocking an error while analyzing a file
+      service.extend(Module.new do
+        def update_rb_file(...)
+          raise
+        end
+      end)
+
+      Tempfile.create(["", ".rb"]) do |f|
+        output = StringIO.new(+"")
+        assert_raises(RuntimeError) { service.batch([f.path], output) }
+        assert_equal("# error: #{f.path}\n", output.string)
+      end
+    end
+  end
+end