Add Text instances for Version and VersionRange

The instance for Version is in the Text module itself because the
Version type is defined in base. This avoids an orphan instance.

Distribution/Compiler.hs

@@ -52,10 +52,11 @@ module Distribution.Compiler (
   showCompilerId,
   ) where
 
-import Distribution.Version (Version(..), showVersion)
+import Distribution.Version (Version(..))
 
 import qualified System.Info (compilerName)
 import qualified Data.Char as Char (toLower)
+import Distribution.Text (display)
 
 data CompilerFlavor = GHC | NHC | YHC | Hugs | HBC | Helium | JHC
                     | OtherCompiler String
@@ -95,7 +96,7 @@ data CompilerId = CompilerId CompilerFlavor Version
 
 showCompilerId :: CompilerId -> String
 showCompilerId (CompilerId f (Version [] _)) = showCompilerFlavor f
-showCompilerId (CompilerId f v) = showCompilerFlavor f ++ '-': showVersion v
+showCompilerId (CompilerId f v) = showCompilerFlavor f ++ '-': display v
 
 lowercase :: String -> String
 lowercase = map Char.toLower

Distribution/InstalledPackageInfo.hs

@@ -66,7 +66,10 @@ import Distribution.Package
          , showPackageId, parsePackageId )
 import qualified Distribution.Package as Package
          ( Package(..), PackageFixedDeps(..) )
-import Distribution.Version	( Version(..), showVersion )
+import Distribution.Version
+         ( Version(..) )
+import Distribution.Text
+         ( Text(disp) )
 import qualified Distribution.Compat.ReadP as ReadP
 
 import Control.Monad	( foldM )
@@ -200,7 +203,7 @@ basicFieldDescrs =
                            text                   parsePackageNameQ
                            packageName            (\name pkg -> pkg{package=(package pkg){pkgName=name}})
  , simpleField "version"
-                           (text . showVersion)   parseOptVersion 
+                           disp                   parseOptVersion
                            packageVersion         (\ver pkg -> pkg{package=(package pkg){pkgVersion=ver}})
  , simpleField "license"
                            (text . show)          parseLicenseQ
@@ -237,7 +240,7 @@ parseFreeText = ReadP.munch (const True)
 installedFieldDescrs :: [FieldDescr InstalledPackageInfo]
 installedFieldDescrs = [
    simpleField "exposed"
-	(text.show) 	   parseReadS
+	disp               parseReadS
 	exposed     	   (\val pkg -> pkg{exposed=val})
  , listField   "exposed-modules"
 	text               parseModuleNameQ

Distribution/Make.hs

@@ -91,7 +91,10 @@ import Distribution.Simple.Command
 import Distribution.Simple.Utils (die, rawSystemExit, cabalVersion)
 
 import Distribution.License (License(..))
-import Distribution.Version (Version(..), showVersion)
+import Distribution.Version
+         ( Version(..) )
+import Distribution.Text
+         ( display )
 
 import System.Environment (getArgs, getProgName)
 import Data.List  (intersperse)
@@ -128,9 +131,9 @@ defaultMainHelper args =
     printErrors errs = do
       putStr (concat (intersperse "\n" errs))
       exitWith (ExitFailure 1)
-    printNumericVersion = putStrLn $ showVersion cabalVersion
+    printNumericVersion = putStrLn $ display cabalVersion
     printVersion        = putStrLn $ "Cabal library version "
-                                  ++ showVersion cabalVersion
+                                  ++ display cabalVersion
 
     progs = defaultProgramConfiguration
     commands =

Distribution/Package.hs

@@ -54,6 +54,8 @@ module Distribution.Package (
   ) where
 
 import Distribution.Version
+import Distribution.Text
+         ( Text(..), display )
 import Distribution.Compat.ReadP as ReadP
 import qualified Text.PrettyPrint as Pretty
 import Text.PrettyPrint ((<+>))
@@ -72,7 +74,7 @@ data PackageIdentifier
 showPackageId :: PackageIdentifier -> String
 showPackageId (PackageIdentifier n (Version [] _)) = n -- if no version, don't show version.
 showPackageId pkgid = 
-  pkgName pkgid ++ '-': showVersion (packageVersion pkgid)
+  pkgName pkgid ++ '-': display (packageVersion pkgid)
 
 parsePackageName :: ReadP r String
 parsePackageName = do ns <- sepBy1 component (char '-')
@@ -87,7 +89,7 @@ parsePackageName = do ns <- sepBy1 component (char '-')
 parsePackageId :: ReadP r PackageIdentifier
 parsePackageId = do 
   n <- parsePackageName
-  v <- (ReadP.char '-' >> parseVersion) <++ return (Version [] [])
+  v <- (ReadP.char '-' >> parse) <++ return (Version [] [])
   return PackageIdentifier{pkgName=n,pkgVersion=v}
 
 -- ------------------------------------------------------------
@@ -99,12 +101,12 @@ data Dependency = Dependency String VersionRange
 
 showDependency :: Dependency -> Pretty.Doc
 showDependency (Dependency name ver) =
-  Pretty.text name <+> Pretty.text (showVersionRange ver)
+  Pretty.text name <+> disp ver
 
 parseDependency :: ReadP r Dependency
 parseDependency = do name <- parsePackageName
                      skipSpaces
-                     ver <- parseVersionRange <++ return AnyVersion
+                     ver <- parse <++ return AnyVersion
                      skipSpaces
                      return $ Dependency name ver
 

Distribution/PackageDescription.hs

@@ -83,9 +83,10 @@ import Distribution.Package
          ( PackageIdentifier(PackageIdentifier), Dependency, Package(..) )
 import Distribution.Version  (Version(Version), VersionRange(AnyVersion))
 import Distribution.License  (License(AllRightsReserved))
-import Distribution.Version  (showVersionRange)
 import Distribution.Compiler (CompilerFlavor, showCompilerFlavor)
 import Distribution.System   (OS, showOS, Arch, showArch)
+import Distribution.Text
+         ( display )
 import Distribution.Simple.Utils  (currentDir)
 import Language.Haskell.Extension (Extension)
 
@@ -469,7 +470,7 @@ instance Show ConfVar where
     show (Arch arch) = "arch(" ++ showArch arch ++ ")"
     show (Flag (ConfFlag f)) = "flag(" ++ f ++ ")"
     show (Impl c v) = "impl(" ++ showCompilerFlavor c
-                       ++ " " ++ showVersionRange v ++ ")"
+                       ++ " " ++ display v ++ ")"
 
 -- | A boolean expression parameterized over the variable type used.
 data Condition c = Var c

Distribution/PackageDescription/Check.hs

@@ -56,9 +56,12 @@ import Distribution.Compiler(CompilerFlavor(..))
 import Distribution.License (License(..))
 import Distribution.Simple.Utils (cabalVersion, intercalate)
 
-import Distribution.Version (Version(..), withinRange, showVersionRange)
+import Distribution.Version
+         ( Version(..), withinRange )
 import Distribution.Package
          ( packageName, packageVersion )
+import Distribution.Text
+         ( display )
 import Language.Haskell.Extension (Extension(..))
 import System.FilePath (takeExtension, isRelative, splitDirectories, (</>))
 
@@ -152,7 +155,7 @@ checkSanity pkg =
     check (not $ cabalVersion `withinRange` requiredCabalVersion) $
       PackageBuildImpossible $
            "This package requires Cabal version: "
-        ++ showVersionRange requiredCabalVersion
+        ++ display requiredCabalVersion
   ]
 
   where requiredCabalVersion = descCabalVersion pkg

Distribution/PackageDescription/Configuration.hs

@@ -56,12 +56,14 @@ import Distribution.PackageDescription
 import Distribution.Simple.PackageIndex (PackageIndex)
 import qualified Distribution.Simple.PackageIndex as PackageIndex
 import Distribution.Version
-    ( Version(..), VersionRange(..), withinRange, parseVersionRange )
+         ( Version(..), VersionRange(..), withinRange )
 import Distribution.Compiler (CompilerFlavor, readCompilerFlavor)
 import Distribution.System
          ( OS, readOS, Arch, readArch )
 import Distribution.Simple.Utils (currentDir)
 
+import Distribution.Text
+         ( Text(parse) )
 import Distribution.Compat.ReadP as ReadP hiding ( char )
 import qualified Distribution.Compat.ReadP as ReadP ( char )
 
@@ -161,7 +163,7 @@ parseCondition = condOr
     oper s        = sp >> string s >> sp
     sp            = skipSpaces
     implIdent     = do i <- ident
-                       vr <- sp >> option AnyVersion parseVersionRange
+                       vr <- sp >> option AnyVersion parse
                        return $ Impl (readCompilerFlavor i) vr
 
 ------------------------------------------------------------------------------

Distribution/PackageDescription/Parse.hs

@@ -76,8 +76,7 @@ import Distribution.Package
          , parsePackageName
          , Dependency(..), showDependency, parseDependency )
 import Distribution.Version
-         ( showVersion, parseVersion
-         , showVersionRange, parseVersionRange, isAnyVersion )
+        ( isAnyVersion )
 import Distribution.Verbosity (Verbosity)
 import Distribution.Compiler  (CompilerFlavor(..))
 import Distribution.PackageDescription.Configuration (parseCondition, freeVars)
@@ -94,10 +93,10 @@ pkgDescrFieldDescrs =
            text                   parsePackageName
            packageName            (\name pkg -> pkg{package=(package pkg){pkgName=name}})
  , simpleField "version"
-           (text . showVersion)   parseVersion
+           disp                   parse
            packageVersion         (\ver pkg -> pkg{package=(package pkg){pkgVersion=ver}})
  , simpleField "cabal-version"
-           (text . showVersionRange) parseVersionRange
+           disp                   parse
            descCabalVersion       (\v pkg -> pkg{descCabalVersion=v})
  , simpleField "build-type"
            (text . maybe "" show) (fmap Just parseReadSQ)

Distribution/ParseUtils.hs

@@ -66,6 +66,8 @@ import Distribution.Version
 import Distribution.Package	( parsePackageName, Dependency(..) )
 import Distribution.Compat.ReadP as ReadP hiding (get)
 import Distribution.ReadE
+import Distribution.Text
+         ( Text(..) )
 import Distribution.Simple.Utils (intercalate)
 import Language.Haskell.Extension (Extension)
 
@@ -537,18 +539,18 @@ parsePackageNameQ :: ReadP r String
 parsePackageNameQ = parseQuoted parsePackageName <++ parsePackageName 
 
 parseVersionRangeQ :: ReadP r VersionRange
-parseVersionRangeQ = parseQuoted parseVersionRange <++ parseVersionRange
+parseVersionRangeQ = parseQuoted parse <++ parse
 
 parseOptVersion :: ReadP r Version
 parseOptVersion = parseQuoted ver <++ ver
-  where ver = parseVersion <++ return noVersion
+  where ver = parse <++ return noVersion
 	noVersion = Version{ versionBranch=[], versionTags=[] }
 
 parseTestedWithQ :: ReadP r (CompilerFlavor,VersionRange)
 parseTestedWithQ = parseQuoted tw <++ tw
   where tw = do compiler <- parseReadS
 		skipSpaces
-		version <- parseVersionRange <++ return AnyVersion
+		version <- parse <++ return AnyVersion
 		skipSpaces
 		return (compiler,version)
 
@@ -604,7 +606,7 @@ showToken str
   where dodgy c = isSpace c || c == ','
 
 showTestedWith :: (CompilerFlavor,VersionRange) -> Doc
-showTestedWith (compiler,version) = text (show compiler ++ " " ++ showVersionRange version)
+showTestedWith (compiler, version) = text (show compiler) <+> disp version
 
 -- | Pretty-print free-format text, ensuring that it is vertically aligned,
 -- and with blank lines replaced by dots for correct re-parsing.

Distribution/Simple.hs

@@ -108,6 +108,8 @@ import Distribution.Verbosity
 import Language.Haskell.Extension
 import Distribution.Version
 import Distribution.License
+import Distribution.Text
+         ( display )
 
 -- Base
 import System.Environment(getArgs,getProgName)
@@ -166,9 +168,9 @@ defaultMainHelper hooks args =
     printErrors errs = do
       putStr (concat (intersperse "\n" errs))
       exitWith (ExitFailure 1)
-    printNumericVersion = putStrLn $ showVersion cabalVersion
+    printNumericVersion = putStrLn $ display cabalVersion
     printVersion        = putStrLn $ "Cabal library version "
-                                  ++ showVersion cabalVersion
+                                  ++ display cabalVersion
 
     progs = allPrograms hooks
     commands =

Distribution/Simple/BuildPaths.hs

@@ -68,7 +68,8 @@ import Distribution.Compiler
          ( CompilerId(..), showCompilerFlavor )
 import Distribution.PackageDescription (PackageDescription)
 import Distribution.Simple.LocalBuildInfo (LocalBuildInfo(buildDir))
-import Distribution.Version (showVersion)
+import Distribution.Text
+         ( display )
 import Distribution.System (OS(..), buildOS)
 
 -- ---------------------------------------------------------------------------
@@ -118,7 +119,7 @@ mkSharedLibName :: PackageIdentifier -> CompilerId -> String
 mkSharedLibName lib (CompilerId compilerFlavor compilerVersion)
   = "libHS" ++ showPackageId lib ++ "-" ++ comp <.> dllExtension
   where comp = showCompilerFlavor compilerFlavor
-            ++ showVersion compilerVersion
+            ++ display compilerVersion
 
 -- ------------------------------------------------------------
 -- * Platform file extensions

Distribution/Simple/Configure.hs

@@ -101,8 +101,7 @@ import Distribution.Simple.Register
 import Distribution.System
     ( OS(..), buildOS, buildArch )
 import Distribution.Version
-    ( Version(..), VersionRange(..), showVersion, readVersion
-    , showVersionRange, orLaterVersion, withinRange )
+    ( Version(..), VersionRange(..), orLaterVersion, withinRange )
 import Distribution.Verbosity
     ( Verbosity, lessVerbose )
 
@@ -131,6 +130,8 @@ import qualified System.Info
     ( compilerName, compilerVersion )
 import System.IO
     ( hPutStrLn, stderr, hGetContents, openFile, hClose, IOMode(ReadMode) )
+import Distribution.Text
+    ( display, simpleParse )
 import Text.PrettyPrint.HughesPJ
     ( comma, punctuate, render, nest, sep )
     
@@ -481,7 +482,7 @@ reportProgram verbosity prog (Just configuredProg)
             UserSpecified p -> " given by user at: " ++ p
           version = case programVersion configuredProg of
             Nothing -> ""
-            Just v  -> " version " ++ showVersion v
+            Just v  -> " version " ++ display v
 
 hackageUrl :: String
 hackageUrl = "http://hackage.haskell.org/cgi-bin/hackage-scripts/package/"
@@ -491,12 +492,12 @@ configDependency :: Verbosity -> PackageIndex InstalledPackageInfo -> Dependency
 configDependency verbosity index dep@(Dependency pkgname vrange) =
   case PackageIndex.lookupDependency index dep of
         [] -> die $ "cannot satisfy dependency "
-                      ++ pkgname ++ showVersionRange vrange ++ "\n"
+                      ++ pkgname ++ display vrange ++ "\n"
                       ++ "Perhaps you need to download and install it from\n"
                       ++ hackageUrl ++ pkgname ++ "?"
         pkgs -> do let pkgid = maximumBy (comparing packageVersion) (map packageId pkgs)
                    info verbosity $ "Dependency " ++ pkgname
-                                ++ showVersionRange vrange
+                                ++ display vrange
                                 ++ ": using " ++ showPackageId pkgid
                    return pkgid
 
@@ -547,7 +548,7 @@ configurePkgconfigPackages verbosity pkg_descr conf
     requirePkg (Dependency pkg range) = do
       version <- pkgconfig ["--modversion", pkg]
                  `Exception.catch` \_ -> die notFound
-      case readVersion version of
+      case simpleParse version of
         Nothing -> die "parsing output of pkg-config --modversion failed"
         Just v | not (withinRange v range) -> die (badVersion v)
                | otherwise                 -> info verbosity (depSatisfied v)
@@ -556,13 +557,13 @@ configurePkgconfigPackages verbosity pkg_descr conf
                     ++ " is required but it could not be found."
         badVersion v = "The pkg-config package " ++ pkg ++ versionRequirement
                     ++ " is required but the version installed on the"
-                    ++ " system is version " ++ showVersion v
-        depSatisfied v = "Dependency " ++ pkg ++ showVersionRange range
-                      ++ ": using version " ++ showVersion v
+                    ++ " system is version " ++ display v
+        depSatisfied v = "Dependency " ++ pkg ++ display range
+                      ++ ": using version " ++ display v
 
         versionRequirement
           | range == AnyVersion = ""
-          | otherwise           = " version " ++ showVersionRange range                            
+          | otherwise           = " version " ++ display range
 
     updateLibrary Nothing    = return Nothing
     updateLibrary (Just lib) = do

Distribution/Simple/GHC.hs

@@ -77,11 +77,13 @@ import Distribution.Simple.Program
 import Distribution.Simple.Compiler
          ( CompilerFlavor(..), CompilerId(..), Compiler(..), compilerVersion
          , OptimisationLevel(..), PackageDB(..), Flag, extensionsToFlags )
-import Distribution.Version	( Version(..), showVersion,
-                                  VersionRange(..), orLaterVersion )
+import Distribution.Version
+         ( Version(..), VersionRange(..), orLaterVersion )
 import Distribution.System
          ( OS(..), buildOS )
 import Distribution.Verbosity
+import Distribution.Text
+         ( display )
 import Language.Haskell.Extension (Extension(..))
 
 import Control.Monad		( unless, when )
@@ -121,8 +123,8 @@ configure verbosity hcPath hcPkgPath conf = do
 
   when (ghcVersion /= ghcPkgVersion) $ die $
        "Version mismatch between ghc and ghc-pkg: "
-    ++ programPath ghcProg ++ " is version " ++ showVersion ghcVersion ++ " "
-    ++ programPath ghcPkgProg ++ " is version " ++ showVersion ghcPkgVersion
+    ++ programPath ghcProg ++ " is version " ++ display ghcVersion ++ " "
+    ++ programPath ghcPkgProg ++ " is version " ++ display ghcPkgVersion
 
   -- finding ghc's local ld is a bit tricky as it's not on the path:
   let ldProgram' = case buildOS of
@@ -649,7 +651,7 @@ makefile pkg_descr lbi flags = do
   let decls = [
         ("modules", unwords (exposedModules lib ++ otherModules bi)),
         ("GHC", programPath ghcProg),
-        ("GHC_VERSION", (showVersion (compilerVersion (compiler lbi)))),
+        ("GHC_VERSION", (display (compilerVersion (compiler lbi)))),
         ("WAYS", (if withProfLib lbi then "p " else "") ++ (if withSharedLib lbi then "dyn" else "")),
         ("odir", builddir),
         ("srcdir", case hsSourceDirs bi of

Distribution/Simple/Haddock.hs

@@ -78,6 +78,8 @@ import Distribution.Simple.Utils
          ( die, warn, notice, intercalate, setupMessage
          , createDirectoryIfMissingVerbose, withTempFile
          , findFileWithExtension, findFile, dotToSep )
+import Distribution.Text
+         ( simpleParse )
 
 import Distribution.Verbosity
 import Language.Haskell.Extension
@@ -161,7 +163,7 @@ haddock pkg_descr lbi suffixes flags = do
 
     when isVersion2 $ do
       strHadGhcVers <- rawSystemProgramStdout verbosity confHaddock ["--ghc-version"]
-      let mHadGhcVers = readVersion strHadGhcVers
+      let mHadGhcVers = simpleParse strHadGhcVers
       when (mHadGhcVers == Nothing) $ die "Could not get GHC version from Haddock"
       when (fromJust mHadGhcVers /= compilerVersion comp) $
         die "Haddock's internal GHC version must match the configured GHC version"

Distribution/Simple/InstallDirs.hs

@@ -76,11 +76,12 @@ import System.FilePath (dropDrive)
 
 import Distribution.Package
          ( PackageIdentifier, packageName, packageVersion, showPackageId )
-import Distribution.Version (showVersion)
 import Distribution.System
          ( OS(..), buildOS )
 import Distribution.Compiler
          ( CompilerId, showCompilerId, CompilerFlavor(..) )
+import Distribution.Text
+         ( display )
 
 #if mingw32_HOST_OS || mingw32_TARGET_OS
 import Foreign
@@ -408,7 +409,7 @@ initialPathTemplateEnv :: PackageIdentifier -> CompilerId
 initialPathTemplateEnv pkgId compilerId =
   map (\(v,s) -> (v, PathTemplate [Ordinary s]))
   [(PkgNameVar,  packageName pkgId)
-  ,(PkgVerVar,   showVersion (packageVersion pkgId))
+  ,(PkgVerVar,   display (packageVersion pkgId))
   ,(PkgIdVar,    showPackageId pkgId)
   ,(CompilerVar, showCompilerId compilerId)]
 

Distribution/Simple/Program.hs

@@ -87,8 +87,10 @@ import qualified Data.Map as Map
 import Distribution.Simple.Utils (die, debug, warn, rawSystemExit,
                                   rawSystemStdout, rawSystemStdout',
                                   withTempFile)
-import Distribution.Version (Version(..), readVersion, showVersion,
-                             VersionRange(..), withinRange, showVersionRange)
+import Distribution.Version
+         ( Version(..), VersionRange(AnyVersion), withinRange )
+import Distribution.Text
+         ( simpleParse, display )
 import Distribution.Verbosity
 import System.Directory (doesFileExist, removeFile, findExecutable)
 import System.FilePath  (dropExtension)
@@ -181,11 +183,11 @@ findProgramVersion :: ProgArg            -- ^ version args
 findProgramVersion versionArg selectVersion verbosity path = do
   str <- rawSystemStdout verbosity path [versionArg]
          `Exception.catch` \_ -> return ""
-  let version = readVersion (selectVersion str)
+  let version = simpleParse (selectVersion str)
   case version of
       Nothing -> warn verbosity $ "cannot determine version of " ++ path
                                ++ " :\n" ++ show str
-      Just v  -> debug verbosity $ path ++ " is version " ++ showVersion v
+      Just v  -> debug verbosity $ path ++ " is version " ++ display v
   return version
 
 -- ------------------------------------------------------------
@@ -390,13 +392,13 @@ requireProgram verbosity prog range conf = do
                       ++ " is required but it could not be found."
         badVersion v l = programName prog ++ versionRequirement
                       ++ " is required but the version found at "
-                      ++ locationPath l ++ " is version " ++ showVersion v
+                      ++ locationPath l ++ " is version " ++ display v
         noVersion l    = programName prog ++ versionRequirement
                       ++ " is required but the version of "
                       ++ locationPath l ++ " could not be determined."
         versionRequirement
           | range == AnyVersion = ""
-          | otherwise           = " version " ++ showVersionRange range
+          | otherwise           = " version " ++ display range
 
 -- ------------------------------------------------------------
 -- * Running programs

Distribution/Simple/SrcDist.hs

@@ -65,7 +65,7 @@ import Distribution.PackageDescription
 import Distribution.PackageDescription.Check
 import Distribution.Package (showPackageId, PackageIdentifier(pkgVersion), Package(..))
 import Distribution.Version
-         ( Version(versionBranch), showVersion, VersionRange(AnyVersion) )
+         ( Version(versionBranch), VersionRange(AnyVersion) )
 import Distribution.Simple.Utils
          ( createDirectoryIfMissingVerbose, readUTF8File, writeUTF8File
          , copyFiles, copyFileVerbose, findFile, findFileWithExtension
@@ -76,6 +76,8 @@ import Distribution.Simple.PreProcess (PPSuffixHandler, ppSuffixes, preprocessSo
 import Distribution.Simple.LocalBuildInfo ( LocalBuildInfo(..) )
 import Distribution.Simple.Program ( defaultProgramConfiguration, requireProgram,
                               rawSystemProgram, tarProgram )
+import Distribution.Text
+         ( display )
 
 import Control.Monad(when, unless)
 import Data.Char (toLower)
@@ -226,7 +228,7 @@ prepareSnapshotTree verbosity pkg mb_lbi tmpDir pps date = do
     replaceVersion :: Version -> String -> String
     replaceVersion version line
       | "version:" `isPrefixOf` map toLower line
-                  = "version: " ++ showVersion version
+                  = "version: " ++ display version
       | otherwise = line
 
 -- | Modifies a 'Version' by appending a snapshot number corresponding

Distribution/Text.hs

@@ -6,8 +6,10 @@ module Distribution.Text (
 
 import qualified Distribution.Compat.ReadP as Parse
 import qualified Text.PrettyPrint          as Disp
+import Text.PrettyPrint ((<>))
 
-import qualified Data.Char as Char (isSpace)
+import Data.Version (Version(Version))
+import qualified Data.Char as Char (isDigit, isAlphaNum, isSpace)
 
 class Text a where
   disp  :: a -> Disp.Doc
@@ -31,3 +33,20 @@ instance Text Bool where
                           Parse.string "True") >> return True
                        , (Parse.string "false" Parse.<++
                           Parse.string "False") >> return False ]
+
+instance Text Version where
+  disp (Version branch tags)
+    = Disp.hcat (Disp.punctuate (Disp.char '.') (map Disp.int branch))
+   <> Disp.hcat (map (\tag -> Disp.char '-' <> Disp.text tag) tags)
+
+  parse = do
+      branch <- Parse.sepBy1 digits (Parse.char '.')
+      tags   <- Parse.many (Parse.char '-' >> Parse.munch1 Char.isAlphaNum)
+      return (Version branch tags)
+    where
+      digits = do
+        first <- Parse.satisfy Char.isDigit
+        if first == '0'
+          then return 0
+          else do rest <- Parse.munch Char.isDigit
+                  return (read (first : rest))

Distribution/Version.hs

@@ -43,47 +43,23 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. -}
 module Distribution.Version (
   -- * Package versions
   Version(..),
-  showVersion,
-  readVersion,
-  parseVersion,
 
   -- * Version ranges
   VersionRange(..), 
   orLaterVersion, orEarlierVersion,
   betweenVersionsInclusive,
   withinRange,
-  showVersionRange,
-  parseVersionRange,
   isAnyVersion,
 
  ) where
 
-import Data.Version	( Version(..), showVersion )
+import Data.Version	( Version(..) )
 
-import Control.Monad    ( liftM )
-import Data.Char	( isSpace, isDigit, isAlphaNum )
-import Data.Maybe	( listToMaybe )
-
-import Distribution.Compat.ReadP
-
--- -----------------------------------------------------------------------------
--- Version utils
-
-parseVersion :: ReadP r Version
-parseVersion = do branch <- sepBy1 digits (char '.')
-                  tags   <- many (char '-' >> munch1 isAlphaNum)
-                  return Version{versionBranch=branch, versionTags=tags}
-  where
-    digits  :: ReadP r Int
-    digits   = do first <- satisfy isDigit
-                  if first == '0'
-		    then return 0
-		    else do rest <- munch isDigit
-                            return (read (first : rest))
-
-readVersion :: String -> Maybe Version
-readVersion str =
-  listToMaybe [ r | (r,s) <- readP_to_S parseVersion str, all isSpace s ]
+import Distribution.Text ( Text(..) )
+import qualified Distribution.Compat.ReadP as Parse
+import Distribution.Compat.ReadP ((+++))
+import qualified Text.PrettyPrint as Disp
+import Text.PrettyPrint ((<>))
 
 -- -----------------------------------------------------------------------------
 -- Version ranges
@@ -133,50 +109,44 @@ withinRange v1 (UnionVersionRanges v2 v3)
 withinRange v1 (IntersectVersionRanges v2 v3) 
    = v1 `withinRange` v2 && v1 `withinRange` v3
 
-showVersionRange :: VersionRange -> String
-showVersionRange AnyVersion = "-any"
-showVersionRange (ThisVersion v) = '=' : '=' : showVersion v
-showVersionRange (LaterVersion v) = '>' : showVersion v
-showVersionRange (EarlierVersion v) = '<' : showVersion v
-showVersionRange (UnionVersionRanges (ThisVersion v1) (LaterVersion v2