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The Perl Code/Comments/Blanks commit statistics for MakeMaker appear to be off. For example, let's look at change 4188. svn diff -r4187:4188 http://svn.schwern.org/svn/CPAN/ExtUtils-MakeMaker/trunk/
.
As you can see lib/ExtUtils/MM_Darwin.pm adds in 13 lines of Perl, 4 lines of comments, 11 lines of POD and 17 blanks for a total of 45 additional lines.
(Ohloh's stats)[http://www.ohloh.net/projects/8110/contributors/3401/commits/16873458] say 27 lines of Perl, 1 comment and 17 blanks for a total of 45 lines. 27 seems to be close to what happens if you count POD as Perl, but that should add up to 24 lines. And why only 1 line of comments?
4187 is another example. svn diff -r4186:4187 http://svn.schwern.org/svn/CPAN/ExtUtils-MakeMaker/trunk/
.
They're all documentation changes, not code, which can only be told if the patch is seen in context. Assuming Ohloh is reading this as Perl I read 11 lines of Perl added with two new comments and 10 lines of Perl removed. That's 13 lines added and 10 lines removed.
(Ohloh's stats)[http://www.ohloh.net/projects/8110/contributors/3401/commits/16873457] say 13 lines of code and 3 comments added. 12 lines of code and 1 comment removed. That's 16 lines added and 13 removed.