prepare for hackage

1 files changed, 40 insertions, 0 deletions

diff --git a/Propellor/Property/File.hs b/Propellor/Property/File.hs
new file mode 100644
index 00000000..082542e9
--- /dev/null
+++ b/Propellor/Property/File.hs
@@ -0,0 +1,40 @@
+module Propellor.Property.File where
+
+import Propellor.Common
+
+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 [])