On 06.11.2015 12:04, Henning Thielemann wrote:
On Fri, 6 Nov 2015, Jakob Schöttl wrote:
I am trying to extract a simple static information out of the cabal file: the hs-source-dirs
Is there a way to get this without resolving conditionals, or with minimal effort? (I don't even understand how to resolving conditionals.)
If you write in a package description:
 If flag(foo)    Hs-Source-Dirs: foo  Else    Hs-Source-Dirs: bar
then Hs-Source-Dirs depends on conditionals. I use this technique in order to select specific modules for Unix and Windows without CPP. How do you want to extract Hs-Source-Dirs without knowing the flag values?
Thank you, Henning. I see, I need to handle this conditionals even if I don't have such conditionals and flags in my cabal file. How can I resolve the conditionals? Can I somehow update the GenericPackageDescription i.e. set all flag values and then fetch the complete PackageDescription in using packageDescription? https://hackage.haskell.org/package/Cabal-1.22.4.0/docs/Distribution-Package... Or are condLibrary, condExecutable, ... the only way to access this data?