On Wed, Jan 12, 2011 at 11:59, Henning Thielemann
On Wed, 12 Jan 2011, Peter Simons wrote:
So you could in principle call it description.cabal consistently in all your packages.
Is it also possible to use a package-specific name for Setup.hs? If I'd be writing a package called "foo", could I use the name "foo.cabal" and "foo.setup" to designate my build instructions? I'd also be happy to call the "Setup.hs" file "Setup-foo.hs" or "Foo-setup.hs" or whatever, as long as there's a package-specific component in the name that matches the one I used for the Cabal file.
If that were the case, then multiple packages could be stored in one directory, and a build call like
cabal configure --package=foo
would be unambiguous.
I think this leads to nothing - you would also need directories like dist-foo and maybe more in the future. The one-directory-to-one-package relation makes things easy and that's somehow what directories are for. The other way round makes more sense to me: Give all package Cabal files the same name (main.cabal?), since the package name is already given by the directory name. Maybe in the future someone wants a Cabal include mechanism that allows to write one Cabal file per executable and to put them together according to include statements in main.cabal.
The discussion and the personal preferences are certainly similar to whether to put many modules into one file, or whether to define identifiers for unqualified import and export many modules by one main module.
My question is: What is really the benefit of having multiple packages in one directory? kahl@cas.mcmaster.ca has commented on this question, but his use case didn't convince me. Building many packages at once, an inter-package Make so to speak, would be nice, but this could be separate from the technique of building one package.
Couldn't that use case also be solved by allowing multiple Library sections in the Cabal file (similar to how multiple Executable sections are allowed). This may, or may not, be easier to deal with than having multiple Cabal files. /M -- Magnus Therning OpenPGP: 0xAB4DFBA4 email: magnus@therning.org jabber: magnus@therning.org twitter: magthe http://therning.org/magnus