Improve overall style and indenting

Algorithms/ConvexHull.hs

@@ -31,11 +31,10 @@ lowestYC (a:b:vs)
 grahamSort :: [PT] -- ^ the points to sort
            -> [PT] -- ^ sorted points
 grahamSort [] = []
-grahamSort xs = p0 : sortBy (\a b
-  -> noEqual a b                            .
-       compare
-       (getAngle (pt2Vec a - pt2Vec p0) xv) $
-       (getAngle (pt2Vec b - pt2Vec p0) xv))
+grahamSort xs =
+  p0 : sortBy (\a b -> noEqual a b     .
+    compare (getAngle xv . (-) (pt2Vec a) $ pt2Vec p0) $
+            (getAngle xv . (-) (pt2Vec b) $ pt2Vec p0))
     (removeItem p0 xs)
   where
     xv = unitX
@@ -51,14 +50,14 @@ grahamSort xs = p0 : sortBy (\a b
       where
         (ax, ay) = unp2 a
         (bx, by) = unp2 b
-      noEqual _ _ LT     = LT
-      noEqual _ _ GT     = GT
+    noEqual _ _ x     = x
 
 
 -- |Get all points on a convex hull by using the graham scan
 -- algorithm.
 grahamGetCH :: [PT] -> [PT]
-grahamGetCH vs = f . grahamSort $ vs
+grahamGetCH vs =
+  f . grahamSort $ vs
   where
     f (x:y:z:xs)
       | ccw x y z = x : f (y:z:xs)
@@ -69,7 +68,8 @@ grahamGetCH vs = f . grahamSort $ vs
 -- |Compute all steps of the graham scan algorithm to allow
 -- visualizing it.
 grahamGetCHSteps :: [PT] -> [[PT]]
-grahamGetCHSteps vs = reverse . g $ (length vs - 2)
+grahamGetCHSteps vs =
+  reverse . g $ (length vs - 2)
   where
     vs' = grahamSort vs
     g c

Diagram.hs

@@ -90,11 +90,10 @@ yuD = snd . dY
 coordPoints :: Diag
 coordPoints = Diag f
   where
-    f p vt
-      = position (zip (filter (inRange (dX p) (dY p)) $ vt)
+    f p vt =
+      position (zip (filter (inRange (dX p) (dY p)) $ vt)
         (repeat dot))
       where
-              -- a dot itself is a diagram
         dot = (circle $ t p :: Diagram Cairo R2) # fc black
 
 
@@ -102,11 +101,10 @@ coordPoints = Diag f
 convexHullPoints :: Diag
 convexHullPoints = Diag f
   where
-    f p vt
-      = position (zip (filter (inRange (dX p) (dY p)) $ vtch)
+    f p vt =
+      position (zip (filter (inRange (dX p) (dY p)) $ vtch)
         (repeat dot))
       where
-              -- a dot itself is a diagram
         dot = (circle $ t p :: Diagram Cairo R2) # fc red # lc red
         vtch = grahamGetCH vt
 
@@ -117,13 +115,14 @@ convexHullLines :: Diag
 convexHullLines = Diag f
   where
     f _ [] = mempty
-    f p vt
-      = (strokeTrail                        .
+    f p vt =
+      (strokeTrail                           .
           fromVertices                       .
           flip (++) [head $ grahamGetCH vtf] .
           grahamGetCH                        $
-         vtf
-        ) # moveTo (head $ grahamGetCH vtf) # lc red
+          vtf)                          #
+        moveTo (head $ grahamGetCH vtf) #
+        lc red
       where
         vtf = filter (inRange (dX p) (dY p)) vt
 
@@ -135,11 +134,12 @@ convexHullLinesInterval :: DiagProp -> [PT] -> [Diagram Cairo R2]
 convexHullLinesInterval p xs =
   fmap g (grahamGetCHSteps xs)
   where
-      g vt
-        = (strokeTrail        .
+    g vt =
+      (strokeTrail         .
           fromVertices     $
-           vtf
-          ) # moveTo (head vtf) # lc red
+          vtf)            #
+        moveTo (head vtf) #
+        lc red
       where
         vtf = filter (inRange (dX p) (dY p)) vt
 
@@ -147,17 +147,20 @@ convexHullLinesInterval p xs =
 -- |Creates a Diagram that shows an XAxis which is bound
 -- by the dimensions given in xD from DiagProp.
 xAxis :: Diag
-xAxis = (Diag hRule)    `mappend`
+xAxis =
+  (Diag hRule)      `mappend`
     (Diag segments) `mappend`
     (Diag labels)
   where
-    hRule p _ = arrowAt (p2 (xlD p,0)) (r2 (xuD p, 0)) #
+    hRule p _ =
+      arrowAt (p2 (xlD p,0)) (r2 (xuD p, 0)) # moveTo (p2 (xlD p,0))
+    segments p _ =
+      hcat' (with & sep .~ 50)
+            (take (floor . (/) (xuD p - xlD p) $ 50) . repeat $ (vrule 10)) #
       moveTo (p2 (xlD p,0))
-    segments p _ = hcat' (with & sep .~ 50)
-                     (take (floor . (/) (xuD p - xlD p) $ 50) .
-                     repeat $ (vrule 10)) # moveTo (p2 (xlD p,0))
     labels p _ =
-      position $ zip (mkPoint <$> xs)
+      position $
+        zip (mkPoint <$> xs)
             ((\x -> (flip (<>) (square 1 # lw none) .
               text . show $ x) # scale 10) <$> xs)
       where
@@ -169,17 +172,22 @@ xAxis = (Diag hRule)    `mappend`
 -- |Creates a Diagram that shows an YAxis which is bound
 -- by the dimensions given in yD from DiagProp.
 yAxis :: Diag
-yAxis = (Diag vRule)    `mappend`
+yAxis =
+  (Diag vRule)      `mappend`
     (Diag segments) `mappend`
     (Diag labels)
   where
-    vRule p _ = arrowAt (p2 (0, ylD p)) (r2 (0, yuD p)) #
-                  moveTo (p2 (0, ylD p))
-    segments p _ = vcat' (with & sep .~ 50)
+    vRule p _ =
+      arrowAt (p2 (0, ylD p)) (r2 (0, yuD p)) # moveTo (p2 (0, ylD p))
+    segments p _ =
+      vcat' (with & sep .~ 50)
             (take (floor . (/) (yuD p - ylD p) $ 50) .
-                    repeat $ (hrule 10)) # alignB # moveTo (p2 (0, (ylD p)))
+              repeat $ (hrule 10)) #
+      alignB                       #
+      moveTo (p2 (0, (ylD p)))
     labels p _ =
-      position $ zip (mkPoint <$> ys)
+      position $
+        zip (mkPoint <$> ys)
             ((\x -> (flip (<>) (square 1 # lw none) .
               text . show $ x) # scale 10) <$> ys)
         where
@@ -202,12 +210,14 @@ whiteRectB = Diag f
 -- |Create the Diagram from the points.
 diag :: DiagProp -> [PT] -> Diagram Cairo R2
 diag p = case alg p of
-  0 -> mkDiag
+  0 ->
+    mkDiag
       (mconcat [coordPoints, xAxis, yAxis,
         (if gd p then grid else mempty), whiteRectB])
       p
-  1 -> mkDiag
-         (mconcat $
+  1 ->
+    mkDiag
+      (mconcat
         [convexHullPoints, convexHullLines, coordPoints,
         xAxis, yAxis, (if gd p then grid else mempty), whiteRectB])
       p
@@ -217,22 +227,25 @@ diag p = case alg p of
 -- |Create the Diagram from a String which is supposed to be the contents
 -- of an obj file.
 diagS :: DiagProp -> String -> Diagram Cairo R2
-diagS p mesh
-  = (diag p      .
+diagS p mesh =
+  (diag p       .
       meshToArr $
-      mesh) # bg white
+      mesh) #
+    bg white
 
 
 -- |Return a list of tuples used by 'gifMain' to generate an animated gif.
 gifDiag :: DiagProp -> [PT] -> [(Diagram Cairo R2, GifDelay)]
-gifDiag p xs = fmap (\x -> (x, 100))                      .
+gifDiag p xs =
+  fmap (\x -> (x, 100))                      .
     fmap (\x -> x <> g)                      .
     flip (++)
       [mkDiag (convexHullLines `mappend`
       convexHullPoints) p xs]                $
     (convexHullLinesInterval p xs)
   where
-                     g = mconcat                      .
+    g =
+      mconcat                      .
         fmap (\x -> mkDiag x p xs) $
         [coordPoints,
         xAxis,
@@ -243,8 +256,7 @@ gifDiag p xs = fmap (\x -> (x, 100))                      .
 -- |Same as gifDiag, except that it takes a string containing the
 -- mesh file content instead of the the points.
 gifDiagS :: DiagProp -> String -> [(Diagram Cairo R2, GifDelay)]
-gifDiagS p = gifDiag p .
-               meshToArr
+gifDiagS p = gifDiag p . meshToArr
 
 
 -- |Create a white rectangle with the given width and height.
@@ -256,12 +268,14 @@ whiteRect x y = rect x y # lwG 0.00 # bg white
 grid :: Diag
 grid = Diag f `mappend` Diag g
   where
-    f p _ = hcat' (with & sep .~ 50)
+    f p _ =
+      hcat' (with & sep .~ 50)
             (take (floor . (/) (xuD p - xlD p) $ 50) .
               repeat $ (vrule $ xuD p - xlD p))   #
       moveTo (p2 (xlD p, (yuD p - ylD p) / 2))    #
       lw ultraThin
-    g p _ = vcat' (with & sep .~ 50)
+    g p _ =
+      vcat' (with & sep .~ 50)
             (take (floor . (/) (yuD p - ylD p) $ 50) .
               repeat $ (hrule $ yuD p - ylD p))  #
       alignB                                     #

Gtk.hs

@@ -77,7 +77,8 @@ makeMyGladeGUI = do
   cB'  <- xmlGetWidget xml castToComboBox "comboalgo"
   gC'  <- xmlGetWidget xml castToCheckButton "gridcheckbutton"
 
-  return $ MkMyGUI win' dB' sB' qB' fB' da' hs' xl' xu' yl' yu' aD' cB' gC'
+  return $ MkMyGUI win' dB' sB' qB' fB' da' hs'
+                   xl' xu' yl' yu' aD' cB' gC'
 
 
 gifCLI :: FilePath -> IO ()
@@ -206,17 +207,22 @@ drawDiag' fp mygui =
       (daW, daH) <- widgetGetSize (da mygui)
       gd'        <- toggleButtonGetActive (gC mygui)
 
-      let xD = (,) <$> readMaybe xlD' <*> readMaybe xuD' :: Maybe (Double,
-                                                                 Double)
-          yD = (,) <$> readMaybe ylD' <*> readMaybe yuD' :: Maybe (Double,
-                                                                 Double)
+      let
+        xD = (,)         <$>
+          readMaybe xlD' <*>
+          readMaybe xuD' :: Maybe (Double, Double)
+        yD = (,)         <$>
+          readMaybe ylD' <*>
+          readMaybe yuD' :: Maybe (Double, Double)
+
       case (xD, yD) of
         (Just xD', Just yD') -> do
           let (_, r) = renderDia Cairo
                 (CairoOptions ""
                    (Dims (fromIntegral daW) (fromIntegral daH))
                    SVG False)
-                         (diagS (def{t  = scaleVal,
+                (diagS (def{
+                    t   = scaleVal,
                     dX  = xD',
                     dY  = yD',
                     alg = alg',
@@ -247,15 +253,19 @@ saveDiag' fp mygui =
       (daW, daH) <- widgetGetSize (da mygui)
       gd'        <- toggleButtonGetActive (gC mygui)
 
-      let xD = (,) <$> readMaybe xlD' <*> readMaybe xuD' :: Maybe (Double,
-                                                                 Double)
-          yD = (,) <$> readMaybe ylD' <*> readMaybe yuD' :: Maybe (Double,
-                                                                 Double)
+      let
+        xD = (,)         <$>
+          readMaybe xlD' <*>
+          readMaybe xuD' :: Maybe (Double, Double)
+        yD = (,)         <$>
+          readMaybe ylD' <*>
+          readMaybe yuD' :: Maybe (Double, Double)
       case (xD, yD) of
         (Just xD', Just yD') -> do
           renderCairo "out.svg"
             (Dims (fromIntegral daW) (fromIntegral daH))
-            (diagS (def{t  = scaleVal,
+            (diagS (def{
+                t   = scaleVal,
                 dX  = xD',
                 dY  = yD',
                 alg = alg',

LinearAlgebra/Vector.hs

@@ -14,15 +14,15 @@ inRange :: Coord -- ^ X dimension
         -> Coord -- ^ Y dimension
         -> PT    -- ^ Coordinates
         -> Bool  -- ^ result
-inRange (xlD, xuD) (ylD, yuD) p
-  = x <= xuD && x >= xlD && y <= yuD && y >= ylD
+inRange (xlD, xuD) (ylD, yuD) p = x <= xuD && x >= xlD && y <= yuD && y >= ylD
   where
     (x, y) = unp2 p
 
 
 -- |Get the angle between two vectors.
 getAngle :: Vec -> Vec -> Double
-getAngle a b = acos                                   .
+getAngle a b =
+  acos                                   .
     flip (/) (vecLength a * vecLength b) .
     scalarProd a                         $
     b
@@ -65,7 +65,8 @@ vp2 a b = (pt2Vec b) - (pt2Vec a)
 -- connecting a-b-c. This is done by computing the determinant and
 -- checking the algebraic sign.
 ccw :: PT -> PT -> PT -> Bool
-ccw a b c = (bx - ax)   *
+ccw a b c =
+  (bx - ax)   *
     (cy - ay) -
     (by - ay) *
     (cx - ax) >= 0

Parser/Core.hs

@@ -13,14 +13,17 @@ module Parser.Core (Parser,
 import Control.Applicative
 import Data.Char
 
+
 -- |The parser type. It allows us to create specific parsers,
 -- combine them and run them via 'runParser' to get a result.
 newtype Parser a = MkParser { runParser :: String -> Maybe (a, String) }
 
+
 -- |Functor instance.
 instance Functor Parser where
   fmap = inParser . fmap . fmap . first
 
+
 -- |Applicative functor instance.
 instance Applicative Parser where
   pure a               = MkParser (\s -> Just (a, s))
@@ -29,11 +32,13 @@ instance Applicative Parser where
       Nothing    -> Nothing
       Just (f,x) -> runParser (f <$> xp) x
 
+
 -- |Alternative functor instance.
 instance Alternative Parser where
   empty                       = MkParser (const Nothing)
   MkParser p1 <|> MkParser p2 = MkParser $ liftA2 (<|>) p1 p2
 
+
 inParser :: ((String -> Maybe (a1, String))
          -> String
          -> Maybe (a, String))
@@ -41,9 +46,11 @@ inParser :: ((String -> Maybe (a1, String))
          -> Parser a
 inParser f p = MkParser . f . runParser $ p
 
+
 first :: (a -> b) -> (a,c) -> (b,c)
 first f (x,y) = (f x, y)
 
+
 -- |Creates a Parser that parses a Char depending on a given condition.
 satisfy :: (Char -> Bool) -- ^ condition
         -> Parser Char    -- ^ created Parser
@@ -54,10 +61,12 @@ satisfy p = MkParser f
         | p x       = Just (x, xs)
         | otherwise = Nothing
 
+
 -- |Creates a Parser that accepts a given Char.
 char :: Char -> Parser Char
 char c = satisfy (== c)
 
+
 -- |Creates a Parser that accepts positive integers.
 posInt :: Parser Integer
 posInt = MkParser f
@@ -67,10 +76,12 @@ posInt = MkParser f
       | otherwise = Just (read ns, rest)
         where (ns, rest) = span isDigit xs
 
+
 -- |Creates a Parser that accepts positive doubles.
 -- Both 131.31 and 132 are valid.
 posDouble :: Parser Double
-posDouble = (read <$>)                   $
+posDouble =
+  (read <$>)                   $
     (\x y z -> x ++ [y] ++ z) <$>
     MkParser f                <*>
     char '.'                  <*>
@@ -82,14 +93,17 @@ posDouble = (read <$>)                   $
       | otherwise = Just (ns, rest)
         where (ns, rest) = span isDigit xs
 
+
 -- |Convert a given Parser to a Parser that accepts zero or more occurences.
 zeroOrMore :: Parser a -> Parser [a]
 zeroOrMore p = oneOrMore p <|> pure []
 
+
 -- |Convert a given Parser to a Parser that accepts one or more occurences.
 oneOrMore :: Parser a -> Parser [a]
 oneOrMore p = (:) <$> p <*> zeroOrMore p
 
+
 -- |Creates a Parser that accepts spaces.
 spaces :: Parser String
 spaces = zeroOrMore (satisfy isSpace)

Parser/Meshparser.hs

@@ -12,7 +12,8 @@ import Parser.Core
 -- an array of float tuples.
 meshToArr :: String   -- ^ the string to convert
           -> [PT]     -- ^ the resulting vertice table
-meshToArr xs = fmap (p2)                       .
+meshToArr xs =
+  fmap (p2)                       .
     fmap (\(Just (x, _)) -> x)    .
     filter (/= Nothing)           .
     fmap (runParser parseVertice) .
@@ -22,6 +23,7 @@ meshToArr xs = fmap (p2)                       .
 
 -- | Creates a Parser that accepts a single vertice, such as 'v 1.0 2.0'.
 parseVertice :: Parser (Double, Double)
-parseVertice = (,)                                 <$>
+parseVertice =
+  (,)                                 <$>
     (char 'v' *> spaces *> posDouble) <*>
     (spaces *> posDouble)

Util.hs

@@ -7,7 +7,8 @@ module Util where
 splitBy :: (a -> Bool) -- ^ condition
         -> [a]         -- ^ array to split
         -> [[a]]       -- ^ splitted array
-splitBy f s =  case dropWhile f s of
+splitBy f s =
+  case dropWhile f s of
     [] -> []
     s' -> w : splitBy f s''
       where (w, s'') = break f s'