Resurrection from bitrot

[Rakka.git] / Rakka / Wiki / Interpreter / Outline.hs

diff --git a/Rakka/Wiki/Interpreter/Outline.hs b/Rakka/Wiki/Interpreter/Outline.hs
index eb8c9d4db095b3b1d2e8e14edcabf9a65b7c8664..3c66db1d90b6913032d20b30bf8c34a931529a3b 100644 (file)
--- a/Rakka/Wiki/Interpreter/Outline.hs
+++ b/Rakka/Wiki/Interpreter/Outline.hs
@@ -1,12 +1,14 @@
+{-# LANGUAGE
+    OverloadedStrings
+  , UnicodeSyntax
+  #-}
 module Rakka.Wiki.Interpreter.Outline
     ( interpreters
     )
     where
-
-import           Data.Generics
-import           Rakka.Wiki
-import           Rakka.Wiki.Interpreter
-
+import Data.Maybe
+import Rakka.Wiki
+import Rakka.Wiki.Interpreter
 
 interpreters :: [Interpreter]
 interpreters = [ outlineInterp ]
@@ -17,23 +19,31 @@ outlineInterp = BlockCommandInterpreter {
                   bciName      = "outline"
                 , bciInterpret
                     = \ ctx _ ->
-                      case ctxMainTree ctx of
+                      case ctxMainWiki ctx of
                         Just tree -> return $ Div [("class", "outline")] [Block $ mkOutline tree]
                         Nothing   -> return EmptyBlock
                 }
 
 
 mkOutline :: WikiPage -> BlockElement
-mkOutline tree
-    = let headings = listify query tree
-      in
-        fst (mkOutline' emptyOutline 1 headings)
+mkOutline tree = fst (mkOutline' emptyOutline 1 headings)
+    where
+      headings :: [BlockElement]
+      headings = concatMap collectInBlock tree
 
+      collectInBlock :: BlockElement -> [BlockElement]
+      collectInBlock hd@(Heading _ _)
+          = [hd]
+      collectInBlock (Div _ xs)
+          = concatMap collectInBlock $ catMaybes (map castToBlock xs)
+      collectInBlock (BlockCmd (BlockCommand _ _ xs))
+          = concatMap collectInBlock xs
+      collectInBlock _
+          = []
 
-query :: Typeable a => a -> Bool
-query = mkQ False $ \ x -> case x of
-                             Heading _ _ -> True
-                             _           -> False
+      castToBlock :: Element -> Maybe BlockElement
+      castToBlock (Block e) = Just e
+      castToBlock _         = Nothing
 
 
 emptyOutline :: BlockElement
@@ -74,7 +84,9 @@ mkOutline' soFar level (x:xs)
                        lastItem' = case lastItem of
                                      []   -> [Block nested]
                                      i:[] -> i ++ [Block nested]
+                                     _    -> undefined
 
                        soFar' = soFar { listItems = nonLastItems ++ [lastItem'] }
                    in
                      mkOutline' soFar' level ys
+        _ -> undefined
\ No newline at end of file