[jira] [Created] (YETUS-488) Checkstyle reports new error if the file still longer than expected

["Peter Vary (JIRA)" <ji...@apache.org>]

Peter Vary created YETUS-488:
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             Summary: Checkstyle reports new error if the file still longer than expected
                 Key: YETUS-488
                 URL: https://issues.apache.org/jira/browse/YETUS-488
             Project: Yetus
          Issue Type: Improvement
          Components: Test Patch
    Affects Versions: 0.4.0
            Reporter: Peter Vary
            Assignee: Peter Vary
            Priority: Minor


Given a java source file which is originally longer than the checkstyle defined value then we get the following warning every time the length changes and we run the checkstyle plugin:
{code}
./beeline/src/java/org/apache/hive/beeline/BeeLine.java:1: warning: File length is 2,373 lines (max allowed is 2,000).
{code}

The problem is, that the checkstyle output is changed:
{code:title=From}
./beeline/src/java/org/apache/hive/beeline/BeeLine.java:1: warning: File length is 2,373 lines (max allowed is 2,000).
{code}
{code:title=To}
./beeline/src/java/org/apache/hive/beeline/BeeLine.java:1: warning: File length is 2,365 lines (max allowed is 2,000).
{code}
Since the {{checkstyle_calcdiffs}} does not find the new line in the original output, it marks it as a new error, and gives -1 to the result of the checkstyle plugin.

This is true for every error message where there is a number in the text. Not exhaustive examples are below:
- Line length
- Row length
- Function length
- Number of attributes
- Indentation

I think we should be reluctant to give -1 without a reason so it would be good to remove these errors.

I have yet to find the ideal solution for the issue:
- An easy patch could be to remove the numbers from files before the diff (note: it does not effect the final diff-checkstyle-<MODULE>.txt output messages). This would mean that the warning will give -1 only the first time when the error text is occurred, and will not give -1 if the numbers are changed, like
-- File become shorter, but still longer than expected
-- File become even longer
-- Indentation changed but still problematic
- A more sophisticated patch could do this only for specific errors, or even check the value and give error when the line length grow.

To be honest, I think the second solution would complicate the code too much, and make it dependent on the specific checkstyle messages, so I do not like it.

I am even hesitant about the first one, because the change I introducing with it might have unwanted consequences.

Do anyone has better ideas? I would be happy to implement them, if someone points me to the right direction :D

Thanks,
Peter



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