Re: [Haskell-cafe] Inject cabal version or VCS version as a CPP macro

22 Feb 2012


      Whoa, I didn't think about using Template Haskell here. Thanks.
Perhaps this should be abstracted into a library.

On Wed, Feb 22, 2012 at 12:40 PM, Michael Snoyman wrote:
...
I have a project at work that embeds the Mercurial version in the
final executable. I use Template Haskell to call the hg executable and
parse its output. Here's the relevant code snippet:
putStrLn $ "Mercurial commit: " ++ $(do
               let getChangeset s =
                       let (k, v') = break (== ':') s
                           v = dropWhile isSpace $ drop 1 v'
                        in if k == "changeset" then Just v else Nothing
               res <- qRunIO $ readProcess "hg" ["heads"] ""
               let cs = mapMaybe getChangeset $ lines res
               lift $ case cs of
                   x:_ -> x
                   [] -> "unknown")
On Wed, Feb 22, 2012 at 10:37 AM, Eugene Kirpichov 
wrote:
...
Thanks, this is exactly what I was looking for!
I might look some more into exposing VCS tags too, however.
On Wed, Feb 22, 2012 at 12:25 PM, Roel van Dijk 
wrote:
...
For each package "myPackage" Cabal generates a module containing,
among other things, the package's version as a Haskell value:
...
import Paths_myPackage ( version )
import Data.Version  ( showVersion )
main = showVersion version
See also "Accessing data files from package code" in
http://www.haskell.org/cabal/users-guide/
I do not now how to expose information from the VCS.
2012/2/22 Eugene Kirpichov :
...
Hi,
I'd like my program to print something like "this is $program 1.0.4
git
...
...
45fea6b" when invoked with --version, or at least just the 1.0.4 part.
Can Cabal expose the version as a preprocessor macro by default, or
do I
have to use Build-Type: Custom and add a preprocessing step of my own?
--
Eugene Kirpichov
Principal Engineer, Mirantis Inc. http://www.mirantis.com/
Editor, http://fprog.ru/
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-- 
Eugene Kirpichov
Principal Engineer, Mirantis Inc. http://www.mirantis.com/
Editor, http://fprog.ru/