    -----------------------------------------------------------------------------
    -- |
    -- Module      :  Distribution.InstalledPackageInfo
    -- Copyright   :  (c) The University of Glasgow 2004
    --
    -- Maintainer  :  libraries@haskell.org
    -- Portability :  portable
    --
    -- This is the information about an /installed/ package that
    -- is communicated to the @ghc-pkg@ program in order to register
    -- a package.  @ghc-pkg@ now consumes this package format (as of version
    -- 6.4). This is specific to GHC at the moment.
    --
    -- The @.cabal@ file format is for describing a package that is not yet
    -- installed. It has a lot of flexibility, like conditionals and dependency
    -- ranges. As such, that format is not at all suitable for describing a package
    -- that has already been built and installed. By the time we get to that stage,
    -- we have resolved all conditionals and resolved dependency version
    -- constraints to exact versions of dependent packages. So, this module defines
    -- the 'InstalledPackageInfo' data structure that contains all the info we keep
    -- about an installed package. There is a parser and pretty printer. The
    -- textual format is rather simpler than the @.cabal@ format: there are no
    -- sections, for example.

    {- All rights reserved.

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions are
    met:

        * Redistributions of source code must retain the above copyright
          notice, this list of conditions and the following disclaimer.

        * Redistributions in binary form must reproduce the above
          copyright notice, this list of conditions and the following
          disclaimer in the documentation and/or other materials provided
          with the distribution.

        * Neither the name of the University nor the names of other
          contributors may be used to endorse or promote products derived
          from this software without specific prior written permission.

    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
    "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
    A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
    OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
    SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
    LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
    OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. -}

    -- This module is meant to be local-only to Distribution...

    module Distribution.InstalledPackageInfo (
            InstalledPackageInfo_(..), InstalledPackageInfo,
            ParseResult(..), PError(..), PWarning,
            emptyInstalledPackageInfo,
            parseInstalledPackageInfo,
            showInstalledPackageInfo,
            showInstalledPackageInfoField,
      ) where

    import Distribution.ParseUtils
             ( FieldDescr(..), ParseResult(..), PError(..), PWarning
             , simpleField, listField, parseLicenseQ
             , showFields, showSingleNamedField, parseFields
             , parseFilePathQ, parseTokenQ, parseModuleNameQ, parsePackageNameQ
             , showFilePath, showToken, boolField, parseOptVersion, parseQuoted
             , parseFreeText, showFreeText )
    import Distribution.License     ( License(..) )
    import Distribution.Package
             ( PackageName(..), PackageIdentifier(..)
             , packageName, packageVersion )
    import qualified Distribution.Package as Package
             ( Package(..), PackageFixedDeps(..) )
    import Distribution.ModuleName
             ( ModuleName )
    import Distribution.Version
             ( Version(..) )
    import Distribution.Text
             ( Text(disp, parse) )
    import qualified Distribution.Compat.ReadP as ReadP

    -- -----------------------------------------------------------------------------
    -- The InstalledPackageInfo type

    data InstalledPackageInfo_ m
       = InstalledPackageInfo {
            -- these parts are exactly the same as PackageDescription
            package           :: PackageIdentifier,
            license           :: License,
            copyright         :: String,
            maintainer        :: String,
            author            :: String,
            stability         :: String,
            homepage          :: String,
            pkgUrl            :: String,
            description       :: String,
            category          :: String,
            -- these parts are required by an installed package only:
            exposed           :: Bool,
            exposedModules    :: [m],
            hiddenModules     :: [m],
            importDirs        :: [FilePath],  -- contain sources in case of Hugs
            libraryDirs       :: [FilePath],
            hsLibraries       :: [String],
            extraLibraries    :: [String],
            extraGHCiLibraries:: [String],    -- overrides extraLibraries for GHCi
            includeDirs       :: [FilePath],
            includes          :: [String],
            depends           :: [PackageIdentifier],
            hugsOptions       :: [String],
            ccOptions         :: [String],
            ldOptions         :: [String],
            frameworkDirs     :: [FilePath],
            frameworks        :: [String],
            haddockInterfaces :: [FilePath],
            haddockHTMLs      :: [FilePath]
        }
        deriving (Read, Show)

    instance Package.Package          (InstalledPackageInfo_ str) where
       packageId = package
    instance Package.PackageFixedDeps (InstalledPackageInfo_ str) where
       depends   = depends

    type InstalledPackageInfo = InstalledPackageInfo_ ModuleName

    emptyInstalledPackageInfo :: InstalledPackageInfo_ m
    emptyInstalledPackageInfo
       = InstalledPackageInfo {
            package           = PackageIdentifier (PackageName "") noVersion,
            license           = AllRightsReserved,
            copyright         = "",
            maintainer        = "",
            author            = "",
            stability         = "",
            homepage          = "",
            pkgUrl            = "",
            description       = "",
            category          = "",
            exposed           = False,
            exposedModules    = [],
            hiddenModules     = [],
            importDirs        = [],
            libraryDirs       = [],
            hsLibraries       = [],
            extraLibraries    = [],
            extraGHCiLibraries= [],
            includeDirs       = [],
            includes          = [],
            depends           = [],
            hugsOptions       = [],
            ccOptions         = [],
            ldOptions         = [],
            frameworkDirs     = [],
            frameworks        = [],
            haddockInterfaces = [],
            haddockHTMLs      = []
        }

    noVersion :: Version
    noVersion = Version{ versionBranch=[], versionTags=[] }

    -- -----------------------------------------------------------------------------
    -- Parsing

    parseInstalledPackageInfo :: String -> ParseResult InstalledPackageInfo
    parseInstalledPackageInfo = parseFields all_fields emptyInstalledPackageInfo

    -- -----------------------------------------------------------------------------
    -- Pretty-printing

    showInstalledPackageInfo :: InstalledPackageInfo -> String
    showInstalledPackageInfo = showFields all_fields

    showInstalledPackageInfoField :: String -> Maybe (InstalledPackageInfo -> String)
    showInstalledPackageInfoField = showSingleNamedField all_fields

    -- -----------------------------------------------------------------------------
    -- Description of the fields, for parsing/printing

    all_fields :: [FieldDescr InstalledPackageInfo]
    all_fields = basicFieldDescrs ++ installedFieldDescrs

    basicFieldDescrs :: [FieldDescr InstalledPackageInfo]
    basicFieldDescrs =
     [ simpleField "name"
                               disp                   parsePackageNameQ
                               packageName            (\name pkg -> pkg{package=(package pkg){pkgName=name}})
     , simpleField "version"
                               disp                   parseOptVersion
                               packageVersion         (\ver pkg -> pkg{package=(package pkg){pkgVersion=ver}})
     , simpleField "license"
                               disp                   parseLicenseQ
                               license                (\l pkg -> pkg{license=l})
     , simpleField "copyright"
                               showFreeText           parseFreeText
                               copyright              (\val pkg -> pkg{copyright=val})
     , simpleField "maintainer"
                               showFreeText           parseFreeText
                               maintainer             (\val pkg -> pkg{maintainer=val})
     , simpleField "stability"
                               showFreeText           parseFreeText
                               stability              (\val pkg -> pkg{stability=val})
     , simpleField "homepage"
                               showFreeText           parseFreeText
                               homepage               (\val pkg -> pkg{homepage=val})
     , simpleField "package-url"
                               showFreeText           parseFreeText
                               pkgUrl                 (\val pkg -> pkg{pkgUrl=val})
     , simpleField "description"
                               showFreeText           parseFreeText
                               description            (\val pkg -> pkg{description=val})
     , simpleField "category"
                               showFreeText           parseFreeText
                               category               (\val pkg -> pkg{category=val})
     , simpleField "author"
                               showFreeText           parseFreeText
                               author                 (\val pkg -> pkg{author=val})
     ]

    installedFieldDescrs :: [FieldDescr InstalledPackageInfo]
    installedFieldDescrs = [
       boolField "exposed"
            exposed            (\val pkg -> pkg{exposed=val})
     , listField   "exposed-modules"
            disp               parseModuleNameQ
            exposedModules     (\xs    pkg -> pkg{exposedModules=xs})
     , listField   "hidden-modules"
            disp               parseModuleNameQ
            hiddenModules      (\xs    pkg -> pkg{hiddenModules=xs})
     , listField   "import-dirs"
            showFilePath       parseFilePathQ
            importDirs         (\xs pkg -> pkg{importDirs=xs})
     , listField   "library-dirs"
            showFilePath       parseFilePathQ
            libraryDirs        (\xs pkg -> pkg{libraryDirs=xs})
     , listField   "hs-libraries"
            showFilePath       parseTokenQ
            hsLibraries        (\xs pkg -> pkg{hsLibraries=xs})
     , listField   "extra-libraries"
            showToken          parseTokenQ
            extraLibraries     (\xs pkg -> pkg{extraLibraries=xs})
     , listField   "extra-ghci-libraries"
            showToken          parseTokenQ
            extraGHCiLibraries (\xs pkg -> pkg{extraGHCiLibraries=xs})
     , listField   "include-dirs"
            showFilePath       parseFilePathQ
            includeDirs        (\xs pkg -> pkg{includeDirs=xs})
     , listField   "includes"
            showFilePath       parseFilePathQ
            includes           (\xs pkg -> pkg{includes=xs})
     , listField   "depends"
            disp               parsePackageId'
            depends            (\xs pkg -> pkg{depends=xs})
     , listField   "hugs-options"
            showToken          parseTokenQ
            hugsOptions        (\path  pkg -> pkg{hugsOptions=path})
     , listField   "cc-options"
            showToken          parseTokenQ
            ccOptions          (\path  pkg -> pkg{ccOptions=path})
     , listField   "ld-options"
            showToken          parseTokenQ
            ldOptions          (\path  pkg -> pkg{ldOptions=path})
     , listField   "framework-dirs"
            showFilePath       parseFilePathQ
            frameworkDirs      (\xs pkg -> pkg{frameworkDirs=xs})
     , listField   "frameworks"
            showToken          parseTokenQ
            frameworks         (\xs pkg -> pkg{frameworks=xs})
     , listField   "haddock-interfaces"
            showFilePath       parseFilePathQ
            haddockInterfaces  (\xs pkg -> pkg{haddockInterfaces=xs})
     , listField   "haddock-html"
            showFilePath       parseFilePathQ
            haddockHTMLs       (\xs pkg -> pkg{haddockHTMLs=xs})
     ]

    parsePackageId' :: ReadP.ReadP [PackageIdentifier] PackageIdentifier
    parsePackageId' = parseQuoted parse ReadP.<++ parse