propellor/Propellor/Property/File.hs

41 lines
1.3 KiB
Haskell

module Propellor.Property.File where
import Propellor
type Line = String
-- | Replaces all the content of a file.
hasContent :: FilePath -> [Line] -> Property
f `hasContent` newcontent = fileProperty ("replace " ++ f)
(\_oldcontent -> newcontent) f
-- | Ensures that a line is present in a file, adding it to the end if not.
containsLine :: FilePath -> Line -> Property
f `containsLine` l = fileProperty (f ++ " contains:" ++ l) go f
where
go ls
| l `elem` ls = ls
| otherwise = ls++[l]
-- | Ensures that a line is not present in a file.
-- Note that the file is ensured to exist, so if it doesn't, an empty
-- file will be written. -}
lacksLine :: FilePath -> Line -> Property
f `lacksLine` l = fileProperty (f ++ " remove: " ++ l) (filter (/= l)) f
-- | Removes a file. Does not remove symlinks or non-plain-files.
notPresent :: FilePath -> Property
notPresent f = check (doesFileExist f) $ Property (f ++ " not present") $
makeChange $ nukeFile f
fileProperty :: Desc -> ([Line] -> [Line]) -> FilePath -> Property
fileProperty desc a f = Property desc $ go =<< doesFileExist f
where
go True = do
ls <- lines <$> catchDefaultIO [] (readFile f)
let ls' = a ls
if ls' == ls
then noChange
else makeChange $ viaTmp writeFile f (unlines ls')
go False = makeChange $ writeFile f (unlines $ a [])