hlint does this to some extent (at least I have some copy-pasted code it keeps on pleading me to remove duplication).
Doug
> very cool feature would be if I could select a program phrase
> and let it find /similar/ phrases, where a similarity metric
> could be edit-distance with respect to language tokens ...
I often wanted a tool that finds (nearly) duplicate AST sub-trees
in a large code base, and suggests refactorings.
Of course, in an IDE, it could alert me on-the-fly
that I'm typing some code that's already present elsewhere.
How might one go about implementing this?
Actual (approximate) sub-tree matching seems the easy part;
but I have no clear idea about whether this
should just use syntax, or needs types as well (my guess is: yes)
what libraries are there to provide the (annotated) ASTs, etc.
- J.W.
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