blob: f27be4ef427049deb3afb4300d38e466c722fdf2 (
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
|
{-
- Copyright 2015 Egor Tensin <Egor.Tensin@gmail.com>
- This file is licensed under the terms of the MIT License.
- See LICENSE.txt for details.
-}
module Main (main) where
import System.Console.GetOpt
import System.Environment (getArgs, getProgName)
import System.Exit (exitFailure, exitSuccess)
import System.IO (hPutStr, stderr)
import qualified Environment
main :: IO ()
main = do
rawArgs <- getArgs
case getOpt Permute optionDescription rawArgs of
(actions, args, []) -> do
options <- foldl (>>=) (return defaultOptions) actions
case args of
[name, value] -> setEnv name value options
_ -> invalidNumberOfArguments
(_, _, errorMessages) ->
exitWithUsageErrors errorMessages
setEnv :: String -> String -> Options -> IO ()
setEnv name value options = Environment.saveToRegistryWithPrompt (env options) name value
data Options = Options
{ env :: Environment.RegistryBasedEnvironment
} deriving (Eq, Show)
defaultOptions :: Options
defaultOptions = Options
{ env = Environment.CurrentUserEnvironment
}
buildHelpMessage :: IO String
buildHelpMessage = do
header <- buildHeader
return $ usageInfo header optionDescription
where
buildHeader = do
progName <- getProgName
return $ "Usage: " ++ progName ++ " [OPTIONS...] NAME VALUE\nOptions:"
exitWithHelpMessage :: Options -> IO a
exitWithHelpMessage _ = do
helpMessage <- buildHelpMessage
putStr helpMessage
exitSuccess
exitWithUsageErrors :: [String] -> IO a
exitWithUsageErrors errorMessages = do
hPutStr stderr $ concatMap ("Usage error: " ++) errorMessages
helpMessage <- buildHelpMessage
hPutStr stderr helpMessage
exitFailure
invalidNumberOfArguments :: IO a
invalidNumberOfArguments = exitWithUsageErrors ["invalid number of arguments\n"]
optionDescription :: [OptDescr (Options -> IO Options)]
optionDescription =
[ Option "g" ["global"] (NoArg $ \opts -> return opts { env = Environment.AllUsersEnvironment }) "save under the registry key for all users"
, Option "h" ["help"] (NoArg exitWithHelpMessage) "show this message and exit"
]
|
