Test script for issue 47

test-issue-47.rb

#!/usr/bin/env ruby -w

# Implementation

BACKTRACE_REGEX = /^(.+?):(\d+)(?::in `(.+?)')?$/.freeze

def strip_load_path path
  prefix = $:
    .map(&:to_s)
    .select { |s| path.start_with?(s) }
    .sort_by { |s| s.length }
    .last

  return path unless prefix

  path[prefix.chomp(File::SEPARATOR).length + 1..-1]
end

# Test scaffolding

def make_java_exception
  require 'java'
  java_import 'java.lang.ClassNotFoundException'
  java::lang::Class.forName("foo.Bar")
rescue ClassNotFoundException => e
  e
end

# Using it

ex = make_java_exception
ex.backtrace.reverse.map {|line|
  _, abs_path, lineno, function = line.match(BACKTRACE_REGEX).to_a
 filename = strip_load_path(abs_path)
}
puts 'Passed the test.'