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Generate.hs
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Generate.hs
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-- Usage: runhaskell Generate.hs New.Module
module Generate (main) where
import Data.List (groupBy, isInfixOf)
import Data.Monoid ((<>))
import System.Directory (createDirectoryIfMissing)
import System.Environment (getArgs)
import System.FilePath (joinPath, takeDirectory, (<.>))
main :: IO ()
main = do
ms <- getArgs
mapM_ createDirectories ms
mapM_ writeFiles ms
mapM_ updateFiles ms
where
createDirectories m = do
createLibraryDirectory m
createTestSuiteDirectory m
writeFiles m = do
writeLibraryFile m
writeTestSuiteFile m
updateFiles m = do
updateCabal m
updateLibrary m
--
createDirectory :: FilePath -> IO ()
createDirectory = createDirectoryIfMissing True . takeDirectory
path :: FilePath -> String -> String -> FilePath
path d s m = joinPath (d : parts (m <> s)) <.> "hs"
parts :: String -> [String]
parts = split '.'
placeholder :: String
placeholder = "New.Module"
pragma :: String
pragma = "-- GENERATE: "
replace :: (Eq a) => [a] -> [a] -> [a] -> [a]
replace [] _ _ = []
replace xs@(h : t) old new =
if a == old
then new <> replace b old new
else h : replace t old new
where
(a, b) = splitAt (length old) xs
split :: (Eq a) => a -> [a] -> [[a]]
split x xs = fmap (dropWhile (== x)) (groupBy (const (x /=)) xs)
updateFile :: FilePath -> String -> IO ()
updateFile p m = do
contents <- readFile p
seq (length contents) (return ())
writeFile p (unlines (go =<< lines contents))
where
go line = if pragma `isInfixOf` line
then [replace (replace line pragma "") placeholder m, line]
else [line]
-- Cabal
cabalPath :: FilePath
cabalPath = "TestGL.cabal"
updateCabal :: String -> IO ()
updateCabal = updateFile cabalPath
-- Library
createLibraryDirectory :: String -> IO ()
createLibraryDirectory = createDirectory . libraryPath
libraryDirectory :: String
libraryDirectory = "library"
libraryPath :: String -> FilePath
libraryPath = path libraryDirectory librarySuffix
libraryTemplate :: String -> String
libraryTemplate m = unlines
[ "-- | TODO"
, "module " <> m <> " () where"
]
librarySuffix :: String
librarySuffix = ""
updateLibrary :: String -> IO ()
updateLibrary = updateFile (libraryPath "TestGL")
writeLibraryFile :: String -> IO ()
writeLibraryFile m = writeFile (libraryPath m) (libraryTemplate m)
-- Test Suite
createTestSuiteDirectory :: String -> IO ()
createTestSuiteDirectory = createDirectory . testSuitePath
testSuiteDirectory :: String
testSuiteDirectory = "test-suite"
testSuitePath :: String -> FilePath
testSuitePath = path testSuiteDirectory testSuiteSuffix
testSuiteTemplate :: String -> String
testSuiteTemplate m = unlines
[ "module " <> m <> "Spec (spec) where"
, ""
, "import " <> m <> " ()"
, ""
, "import Test.Hspec"
, ""
, "spec :: Spec"
, "spec = it \"is\" pending"
]
testSuiteSuffix :: String
testSuiteSuffix = "Spec"
writeTestSuiteFile :: String -> IO ()
writeTestSuiteFile m = writeFile (testSuitePath m) (testSuiteTemplate m)