[web-devel] [Yesod] Is there a api which get yesod version?

Michael Snoyman michael at snoyman.com
Tue Dec 21 16:34:54 CET 2010

Thanks to everyone for input on this, I was completely unaware of
Paths_* being provided by cabal. I've just pushed a yesodVersion
function to the ver0.7 branch on Git.

For the record, you *do* need to include the Paths_* module in
other-modules in order to make your code usable.


On Tue, Dec 21, 2010 at 2:42 PM, Simon Meier <iridcode at gmail.com> wrote:
> 2010/12/21 Felipe Almeida Lessa <felipe.lessa at gmail.com>
>> 2010/12/21 Michael Snoyman <michael at snoyman.com>:
>> > Do you know of any prior art that does this? Having a package import
>> > files generated by cabal seems like it could cause problems.
>> Although Cabal's documentation only mentions 'getDataFileName' [1],
>> the API states that the Paths module should "enable [the packages] to
>> find their version number" [2].  So that's the intended use, even if
>> not very well documented.  Just remember to put the Paths in
>> 'other-modules' [1].
> I'm not sure, if it should be put in 'other-modules' as the
> your_project_paths.hs is an autogenerated file, which you don't want to ship
> with your source. I'd rather go for exporting the yesod version via its own
> API and use the paths file to implement that functionality. One thing, I
> always found useful is to have a directory
>   interactive-only-src/
> containing a copy of the autogenerated paths file as in
>   interactive-only-src/your_project_paths.hs
> together with the .ghci file containing a line
>   :set -iinteractive-only-src
> This way you GHCi works as intended and the paths file is autogenerated and
> compiled in upon install.
> cheers,
> Simon
>> [1]
>> http://www.haskell.org/cabal/release/cabal-latest/doc/users-guide/authors.html#paths-module
>> [2]
>> http://www.haskell.org/cabal/release/cabal-latest/doc/API/Cabal/Distribution-Simple-Build-PathsModule.html
>> Cheers! =)
>> --
>> Felipe.
>> _______________________________________________
>> web-devel mailing list
>> web-devel at haskell.org
>> http://www.haskell.org/mailman/listinfo/web-devel

More information about the web-devel mailing list