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{-
DpkgVersion.hs: Haskell bindings to libdpkg
Copyright (C) 2011-2012 Clint Adams
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
-}
module Debian.Dpkg.DpkgVersion (
peekDpkgVersion
, getConfigVersion
, DpkgVersion(DpkgVersion,vr_epoch,vr_version,vr_revision)
) where
import Data.ByteString.Char8 (unpack)
import Foreign.Ptr (Ptr)
import Foreign.Marshal.Utils (with)
import System.IO.Unsafe (unsafePerformIO)
import Debian.Dpkg.Types
import Debian.Dpkg.DB (c'parseversion, c'dpkg_version_compare)
import qualified Data.ByteString as BS
-- #starttype struct dpkg_version
-- #field epoch , CInt
-- #field version , CString
-- #field revision , CString
-- #stoptype
peekDpkgVersion :: C'dpkg_version -> IO DpkgVersion
peekDpkgVersion vr = do
v <- BS.packCString (c'dpkg_version'version vr)
r <- BS.packCString (c'dpkg_version'revision vr)
return $ DpkgVersion (fromIntegral (c'dpkg_version'epoch vr)) v r
getConfigVersion :: C'pkginfo -> IO String
getConfigVersion p = do
vr <- peekDpkgVersion (c'pkginfo'configversion p)
let e = fromIntegral (vr_epoch vr)
let v = vr_version vr
let r = vr_revision vr
return $ nonZeroEpoch e ++ (unpack v) ++ nonNativeRevision r
where
nonZeroEpoch e = if e == 0 then "" else (show e) ++ ":"
nonNativeRevision r = if r == BS.empty then (unpack r) else "-" ++ (unpack r)
data DpkgVersion = DpkgVersion {
vr_epoch :: Int,
vr_version :: BS.ByteString,
vr_revision :: BS.ByteString
} deriving (Eq,Show)
cvrpCompare :: Ptr C'dpkg_version -> Ptr C'dpkg_version -> IO Ordering
cvrpCompare x y = do
r <- c'dpkg_version_compare x y
case r of
-1 -> return LT
0 -> return EQ
1 -> return GT
cvrCompare :: C'dpkg_version -> C'dpkg_version -> Ordering
cvrCompare = (unsafePerformIO .) . (. ((. cvrpCompare) . with)) . with
instance Ord C'dpkg_version where
compare = cvrCompare
|
