aboutsummaryrefslogtreecommitdiffstatshomepage
path: root/src/WindowsEnv/Environment.hs
blob: 8bfb449214930148204966b106f2ef7479ed2241 (plain) (blame)
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
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
-- |
-- Description : High-level environment variables management functions
-- Copyright   : (c) 2015 Egor Tensin <Egor.Tensin@gmail.com>
-- License     : MIT
-- Maintainer  : Egor.Tensin@gmail.com
-- Stability   : experimental
-- Portability : Windows-only
--
-- High-level functions for reading and writing Windows environment variables.

module WindowsEnv.Environment
    ( Profile(..)
    , profileKeyPath

    , VarName
    , VarValue
    , query
    , engrave
    , engraveForce
    , wipe

    , pathJoin
    , pathSplit
    ) where

import Control.Monad.Trans.Class  (lift)
import Control.Monad.Trans.Except (ExceptT(..))
import Data.List       (intercalate)
import Data.List.Split (splitOn)

import qualified WindowsEnv.Registry as Registry
import           WindowsEnv.Utils    (notifyEnvironmentUpdate)

data Profile = CurrentUser
             | AllUsers
             deriving (Eq, Show)

profileKeyPath :: Profile -> Registry.KeyPath
profileKeyPath CurrentUser = Registry.KeyPath Registry.CurrentUser ["Environment"]
profileKeyPath AllUsers    = Registry.KeyPath Registry.LocalMachine
    [ "SYSTEM"
    , "CurrentControlSet"
    , "Control"
    , "Session Manager"
    , "Environment"
    ]

type VarName  = String
type VarValue = String

query :: Profile -> VarName -> ExceptT IOError IO VarValue
query profile name = Registry.getExpandedString (profileKeyPath profile) name

engrave :: Profile -> VarName -> VarValue -> ExceptT IOError IO ()
engrave profile name value = do
    ret <- Registry.setStringPreserveType (profileKeyPath profile) name value
    lift notifyEnvironmentUpdate
    return ret

engraveForce :: Profile -> VarName -> VarValue -> ExceptT IOError IO ()
engraveForce profile name value = do
    ret <- Registry.setString (profileKeyPath profile) name value
    lift notifyEnvironmentUpdate
    return ret

wipe :: Profile -> VarName -> ExceptT IOError IO ()
wipe profile name = do
    ret <- Registry.deleteValue (profileKeyPath profile) name
    lift notifyEnvironmentUpdate
    return ret

pathSep :: VarValue
pathSep = ";"

pathSplit :: VarValue -> [VarValue]
pathSplit = filter (not . null) . splitOn pathSep

pathJoin :: [VarValue] -> VarValue
pathJoin = intercalate pathSep . filter (not . null)