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PO
primarykey
Id
1522716
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
0
CommunityOwnedDate
2009-10-05T22:24:47.523
CreationDate
2009-10-05T22:24:47.523
FavoriteCount
0
LastActivityDate
2009-10-05T22:24:47.523
LastEditDate
LastEditorUserId
0
OwnerUserId
120163
ParentId
1521306
PostTypeId
2
Score
1
ViewCount
0
LastEditorDisplayName
text
Body
You appear to be interested in origin tracking, the problem of tracing where a line came from. Ideally, you'd instrument the editor to remember how things were edited, and store the edits with the text in your repository, thus solving the problem trivially, but none of us software engineers seem to be smart enough to implement this simple idea. As a weak substitute, one can look at a sequence of source code revisions from the repository and reconstruct a "plausible" history of changes. This is what you seem to be doing by proposing the use of "diff". As you've noted, diff doesn't understand the idea of "moving" or "copying". <a href="http://www.semanticdesigns.com/Products/SmartDifferencer" rel="nofollow noreferrer">SD Smart Differencer</a> tools compare source text by parsing the text according to the langauge it is in, discovering the code structures, and computing least-Levensthein differences in terms of programming language constructs (identifiers, expressions, statements, blocks, classes, ...) and abstract editing operators "insert", "delete", "copy", "move" and "rename identifier within a scope". They produce diff-like output, a little richer because they tell you line/column -> line/column with different editing operations. Obviously the "move" and "copy" edits are the ones most interesting to you in terms of tracking specific lines (well, specific language constructs). Our experience is that code goes through lots of copy and edits, too, which I suspect won't surprise you. These tools are in Beta, and are presently available for COBOL, Java and C#. Lots of other langauges are in the pipe, because the SmartDifferencer is built on top of a langauge-parameterized infrastructure, <a href="http://www.semanticdesigns.com/Products/DMS/DMSToolkit.html" rel="nofollow noreferrer">DMS Software Reengineering Toolkit</a>, which has quite a number of already existing, robust langauge grammars.
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1. POIs there a diff algorithm that preserves line ownership
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