度量metric_fu ruby​​1.9.2 Rails3.0未定义方法`length'对于 nil:NilClass

Question

我正在尝试使用我的 Rails 3.0 应用程序运行 metric_fu 。 我已经检查了 metrical gem 以避免依赖问题并使设置 metric_fu 变得更容易。

我可以让它工作，但只有一个例外

/home/mahmoud/.rvm/gems/ruby-1.9.2-p180@metrics/gems/syntax-1.0.0/lib/syntax/lang/ruby.rb:239:in `block in scan_delimited_region': undefined method `length' for nil:NilClass (NoMethodError)
from /home/mahmoud/.rvm/gems/ruby-1.9.2-p180@metrics/gems/syntax-1.0.0/lib/syntax/lang/ruby.rb:231:in `loop'
from /home/mahmoud/.rvm/gems/ruby-1.9.2-p180@metrics/gems/syntax-1.0.0/lib/syntax/lang/ruby.rb:231:in `scan_delimited_region'
from /home/mahmoud/.rvm/gems/ruby-1.9.2-p180@metrics/gems/syntax-1.0.0/lib/syntax/lang/ruby.rb:143:in `step'
from /home/mahmoud/.rvm/gems/ruby-1.9.2-p180@metrics/gems/syntax-1.0.0/lib/syntax/common.rb:77:in `tokenize'
from /home/mahmoud/.rvm/gems/ruby-1.9.2-p180@metrics/gems/syntax-1.0.0/lib/syntax/convertors/html.rb:16:in `convert'
from /home/mahmoud/.rvm/gems/ruby-1.9.2-p180@metrics/gems/metric_fu-2.1.1/lib/templates/awesome/awesome_template.rb:59:in `block (2 levels) in write_file_data'
from /home/mahmoud/.rvm/gems/ruby-1.9.2-p180@metrics/gems/metric_fu-2.1.1/lib/templates/awesome/awesome_template.rb:46:in `each'
from /home/mahmoud/.rvm/gems/ruby-1.9.2-p180@metrics/gems/metric_fu-2.1.1/lib/templates/awesome/awesome_template.rb:46:in `each_with_index'
from /home/mahmoud/.rvm/gems/ruby-1.9.2-p180@metrics/gems/metric_fu-2.1.1/lib/templates/awesome/awesome_template.rb:46:in `block in write_file_data'
from /home/mahmoud/.rvm/gems/ruby-1.9.2-p180@metrics/gems/metric_fu-2.1.1/lib/templates/awesome/awesome_template.rb:40:in `each_pair'
from /home/mahmoud/.rvm/gems/ruby-1.9.2-p180@metrics/gems/metric_fu-2.1.1/lib/templates/awesome/awesome_template.rb:40:in `write_file_data'
from /home/mahmoud/.rvm/gems/ruby-1.9.2-p180@metrics/gems/metric_fu-2.1.1/lib/templates/awesome/awesome_template.rb:34:in `write'
from /home/mahmoud/.rvm/gems/ruby-1.9.2-p180@metrics/gems/metric_fu-2.1.1/lib/base/report.rb:48:in `save_templatized_report'
from /home/mahmoud/.rvm/gems/ruby-1.9.2-p180@metrics/gems/metrical-0.0.7/lib/metrical.rb:54:in `run_metric_fu'
from /home/mahmoud/.rvm/gems/ruby-1.9.2-p180@metrics/gems/metrical-0.0.7/lib/metrical.rb:18:in `run'
from /home/mahmoud/.rvm/gems/ruby-1.9.2-p180@metrics/gems/metrical-0.0.7/bin/metrical:4:in `<top (required)>'
from /home/mahmoud/.rvm/gems/ruby-1.9.2-p180@metrics/bin/metrical:19:in `load'
from /home/mahmoud/.rvm/gems/ruby-1.9.2-p180@metrics/bin/metrical:19:in `<main>'

我尝试编辑此文件 gems/syntax-1.0.0/lib/syntax/lang/ruby.rb line#239

start_group inner_group, text if text.length > 0

并将其编辑为

start_group inner_group, text if !text.blank?

这次它毫无例外地工作，我可以生成 metric_fu 报告，但存在两个问题：

1. metric 任务未完成其工作。看起来它陷入了无限循环。
2. 一些报告（例如 reek、roodi 和 Rails 最佳实践）可以成功显示结果，但不显示图表；他们显示“无数据”而不是图表

我不确定我的 ruby​​ 代码更新是否会损害它或其他什么？