1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
|
--
-- (c) The University of Glasgow, 2004
--
module PackageConfig (
-- * PackageId
mkPackageId, packageConfigId, unpackPackageId,
-- * The PackageConfig type: information about a package
PackageConfig,
InstalledPackageInfo_(..), display,
Version(..),
PackageIdentifier(..),
defaultPackageConfig,
) where
#include "HsVersions.h"
import Module
import Distribution.InstalledPackageInfo
import Distribution.Package
import Distribution.Text
import Distribution.Version
import Distribution.Compat.ReadP ( readP_to_S )
-- -----------------------------------------------------------------------------
-- Our PackageConfig type is just InstalledPackageInfo from Cabal. Later we
-- might need to extend it with some GHC-specific stuff, but for now it's fine.
type PackageConfig = InstalledPackageInfo_ ModuleName
defaultPackageConfig :: PackageConfig
defaultPackageConfig = emptyInstalledPackageInfo
-- -----------------------------------------------------------------------------
-- PackageId (package names with versions)
-- Mostly the compiler deals in terms of PackageNames, which don't
-- have the version suffix. This is so that we don't need to know the
-- version for the -package-name flag, or know the versions of
-- wired-in packages like base & rts. Versions are confined to the
-- package sub-system.
--
-- This means that in theory you could have multiple base packages installed
-- (for example), and switch between them using -package/-hide-package.
--
-- A PackageId is a string of the form <pkg>-<version>.
mkPackageId :: PackageIdentifier -> PackageId
mkPackageId = stringToPackageId . display
packageConfigId :: PackageConfig -> PackageId
packageConfigId = mkPackageId . package
unpackPackageId :: PackageId -> Maybe PackageIdentifier
unpackPackageId p
= case [ pid | (pid,"") <- readP_to_S parse str ] of
[] -> Nothing
(pid:_) -> Just pid
where str = packageIdString p
|