class ElasticAPM::Stacktrace::Frame

def build_context(context_line_count)
  return unless abs_path && context_line_count > 0
  padding = (context_line_count - 1) / 2
  from = lineno - padding - 1
  to = lineno + padding - 1
  file_lines = read_lines(abs_path, from..to)
  self.context_line = file_lines[padding]
  self.pre_context  = file_lines.first(padding)
  self.post_context = file_lines.last(padding)
end

def read_lines(path, range)
  if (cached = LineCache.get(path, range))
    return cached
  end
  LineCache.set(path, range, File.readlines(path)[range])
rescue Errno::ENOENT
  []
end