Disable partial functions (thanks chrisdone)

5 files changed, 9 insertions, 15 deletions

diff --git a/src/Text/Hakyll/File.hs b/src/Text/Hakyll/File.hs
index 15903c7..57571e4 100644
--- a/src/Text/Hakyll/File.hs
+++ b/src/Text/Hakyll/File.hs
@@ -34,7 +34,7 @@ import Text.Hakyll.Internal.FileType (isRenderableFile)
 removeLeadingSeparator :: FilePath -> FilePath
 removeLeadingSeparator [] = []
 removeLeadingSeparator path
-    | head path' `elem` pathSeparators = tail path'
+    | head path' `elem` pathSeparators = drop 1 path'
     | otherwise                        = path'
   where
     path' = if "$root" `isPrefixOf` path then drop 5 path
diff --git a/src/Text/Hakyll/Internal/CompressCss.hs b/src/Text/Hakyll/Internal/CompressCss.hs
index 4b19984..4a78791 100644
--- a/src/Text/Hakyll/Internal/CompressCss.hs
+++ b/src/Text/Hakyll/Internal/CompressCss.hs
@@ -29,8 +29,8 @@ stripComments :: String -> String
 stripComments [] = []
 stripComments str
     | isPrefixOf "/*" str = stripComments $ eatComments $ drop 2 str
-    | otherwise = head str : stripComments (tail str)
+    | otherwise = head str : stripComments (drop 1 str)
   where
     eatComments str' | null str' = []
                      | isPrefixOf "*/" str' = drop 2 str'
-                     | otherwise = eatComments $ tail str'
+                     | otherwise = eatComments $ drop 1 str'
diff --git a/src/Text/Hakyll/Internal/Page.hs b/src/Text/Hakyll/Internal/Page.hs
index 59bae65..92fb4fc 100644
--- a/src/Text/Hakyll/Internal/Page.hs
+++ b/src/Text/Hakyll/Internal/Page.hs
@@ -71,8 +71,8 @@ readSection _ _ [] = []
 readSection renderFunction isFirst ls
     | not isDelimiter' = body ls
     | isNamedDelimiter = readSectionMetaData ls
-    | isFirst = readSimpleMetaData (tail ls)
-    | otherwise = body (tail ls)
+    | isFirst = readSimpleMetaData (drop 1 ls)
+    | otherwise = body (drop 1 ls)
   where
     isDelimiter' = isPossibleDelimiter (head ls)
     isNamedDelimiter = head ls `matchesRegex` "^----*  *[a-zA-Z0-9][a-zA-Z0-9]*"
@@ -80,7 +80,7 @@ readSection renderFunction isFirst ls
 
     readSimpleMetaData = map readPair . filter (not . all isSpace)
     readPair = trimPair . break (== ':')
-    trimPair (key, value) = (trim key, trim $ tail value)
+    trimPair (key, value) = (trim key, trim $ drop 1 value)
 
     readSectionMetaData [] = []
     readSectionMetaData (header:value) =
diff --git a/src/Text/Hakyll/Internal/Template.hs b/src/Text/Hakyll/Internal/Template.hs
index bd9121b..15a2c8c 100644
--- a/src/Text/Hakyll/Internal/Template.hs
+++ b/src/Text/Hakyll/Internal/Template.hs
@@ -29,15 +29,13 @@ fromString = Template . fromString'
     fromString' [] = []
     fromString' string
         | "$$" `isPrefixOf` string =
-            EscapeCharacter : (fromString' $ tail tail')
+            EscapeCharacter : (fromString' $ drop 2 string)
         | "$" `isPrefixOf` string =
-            let (key, rest) = span isAlphaNum tail'
+            let (key, rest) = span isAlphaNum $ drop 1 string
             in Identifier key : fromString' rest
         | otherwise =
             let (chunk, rest) = break (== '$') string
             in Chunk chunk : fromString' rest
-      where
-        tail' = tail string
 
 -- | Read a @Template@ from a file. This function might fetch the @Template@
 --   from the cache, if available.
diff --git a/src/Text/Hakyll/Util.hs b/src/Text/Hakyll/Util.hs
index 84d6257..e032c52 100644
--- a/src/Text/Hakyll/Util.hs
+++ b/src/Text/Hakyll/Util.hs
@@ -22,11 +22,7 @@ stripHtml :: String -> String
 stripHtml []  = []
 stripHtml str = let (beforeTag, rest) = break (== '<') str
                     (_, afterTag)     = break (== '>') rest
-                in beforeTag ++ stripHtml (tail' afterTag)
-  where
-    -- We need a failsafe tail function.
-    tail' [] = []
-    tail' xs = tail xs
+                in beforeTag ++ stripHtml (drop 1 afterTag)
 
 -- | Make a HTML link.
 --