I would like to strive to find objective data on the use of extensions. I started a table here which summarizes how popular extensions are in real-life code. We need more data points, though. http://hackage.haskell.org/trac/haskell-prime/wiki/ExtensionsExperiment I have a short program which queries the hackage database, gets some details about all of the packages there, and summarizes them into a table. Right now, there really aren't that many packages on HackageDB, but hopefully more will appear. HackageDB is here: http://hackage.haskell.org/ModHackage/Hackage.hs?action=home You can upload packages with Cabal-Put, but it's pretty hackish right now. I put detailed installation instructions on the wiki: http://hackage.haskell.org/trac/hackage/wiki/CabalPut A list of cabal packages that might be good for uploading is here: http://hackage.haskell.org/trac/hackage/wiki/CabalPackages The more packages we get into HackageDB, the more accurate objective data we can build. Let me know if you want to help! peace, isaac
On Fri, Feb 03, 2006 at 11:38:09AM -0800, Isaac Jones wrote:
I would like to strive to find objective data on the use of extensions. I started a table here which summarizes how popular extensions are in real-life code. We need more data points, though.
http://hackage.haskell.org/trac/haskell-prime/wiki/ExtensionsExperiment
I have a short program which queries the hackage database, gets some details about all of the packages there, and summarizes them into a table.
I'm not sure how useful this info is, as: * You won't get, for example, FunctionalDependencies from any libraries or applications that make use of Control.Monad.State. * Many extensions turn into -fglasgow-exts/-98, so if I use functional dependencies and rank 2 types but only declare FunctionalDependencies and not Rank2Types then nothing is going to tell me I've made a mistake. (I think it would be great if this was fixed). (Ideally something could warn about unused extensions too, but that's trickier). * People will sometimes be willing to jump through hoops to avoid using an unportable extension. That said, FWIW, I have the following in my cabalised libraries (none in hackage AFAIK): * ForeignFunctionInterface, TemplateHaskell, TypeSynonymInstances * TypeSynonymInstances * ForeignFunctionInterface * ForeignFunctionInterface * EmptyDataDecls, CPP * EmptyDataDecls, ForeignFunctionInterface Thanks Ian
Ian Lynagh
On Fri, Feb 03, 2006 at 11:38:09AM -0800, Isaac Jones wrote:
I would like to strive to find objective data on the use of extensions. I started a table here which summarizes how popular extensions are in real-life code. We need more data points, though.
http://hackage.haskell.org/trac/haskell-prime/wiki/ExtensionsExperiment
I have a short program which queries the hackage database, gets some details about all of the packages there, and summarizes them into a table.
I'm not sure how useful this info is, as:
There are definitely imperfections in the data, but surely the actual data about which extensions are being used in real code is relevant.
* You won't get, for example, FunctionalDependencies from any libraries or applications that make use of Control.Monad.State.
I suppose we could try to chase down those dependencies. If Package A depends on Package B, and Package B uses extension X, then perhaps we could count package A as half a point for extension X. All the data is there, this would be pretty easy to add.
* Many extensions turn into -fglasgow-exts/-98, so if I use functional dependencies and rank 2 types but only declare FunctionalDependencies and not Rank2Types then nothing is going to tell me I've made a mistake.
True enough, but I think people know when they are using extensions. One solution would be to make sure that all extensions have their own flag instead of so many going to -fglasgow-exts. (snip)
* People will sometimes be willing to jump through hoops to avoid using an unportable extension.
That said, FWIW, I have the following in my cabalised libraries (none in hackage AFAIK):
If you give me links, I'll upload them, or you could upload them as per the instructions on the wiki. peace, isaac
participants (2)
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Ian Lynagh -
Isaac Jones