class ExceptionFormatter

# File lib/exception_formatter.rb, line 7
def self.format(exception, options = {})
  self.new(options).format(exception)
end

# File lib/exception_formatter.rb, line 11
def initialize(options = {})
  @pattern = options[:pattern] ? options[:pattern].to_s : DEFAULT_PATTERN
end

# File lib/exception_formatter.rb, line 16
def format(exception)
  s = @pattern.dup
  s = s.gsub('%b', exception.backtrace.join("\n"))
  s = s.gsub(/%c{(\w+)}/) { |match| exception_cause(exception, $1) }
  s = s.gsub('%c', exception_cause(exception, :cause))
  s = s.gsub('%k', exception.class.name)
  s = s.gsub('%m', exception.message.to_s)
  s = s.gsub('%r', exception_record_errors(exception))
  s = s.gsub(/%x{(\w+)}/) { |match| exception_method(exception, $1) }
  s
end

# File lib/exception_formatter.rb, line 30
def exception_cause(exception, method)
  if exception.respond_to?(method) && exception.send(method).respond_to?(:message)
    exception.send(method).message
  else
    ""
  end
end

# File lib/exception_formatter.rb, line 48
def exception_method(exception, method)
  exception.respond_to?(method) ? exception.send(method) : ""
end

# File lib/exception_formatter.rb, line 38
def exception_record_errors(exception)
  if exception.respond_to?(:record) &&
     exception.record.respond_to?(:errors)
     exception.record.errors.respond_to?(:full_messages)
    exception.record.errors.full_messages.to_s
  else
    ""
  end
end