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
|
module Language.Elna.CommandLine
( CommandLine(..)
, commandLine
, execParser
) where
import Options.Applicative
( Parser
, ParserInfo(..)
, argument
, execParser
, fullDesc
, help
, helper
, info
, long
, metavar
, optional
, progDesc
, short
, str
, strOption
)
import Control.Applicative ((<**>))
data CommandLine = CommandLine
{ input :: FilePath
, output :: Maybe FilePath
} deriving (Eq, Show)
parser :: Parser CommandLine
parser = CommandLine
<$> argument str inFile
<*> optional (strOption outFile)
where
inFile = metavar "INFILE" <> help "Input file."
outFile = long "output"
<> short 'o'
<> metavar "OUTFILE"
<> help "Output file."
commandLine :: ParserInfo CommandLine
commandLine = info (parser <**> helper)
$ fullDesc <> progDesc "Elna compiler."
|
