Editor with some commands, using PGF API, with demo shell in exper/EditShell; still buggy

src/exper/EditShell.hs

@@ -0,0 +1,39 @@
+module Main where
+
+import PGF.Editor
+import PGF
+
+import System (getArgs)
+
+main = do
+  putStrLn "Hi, I'm the Editor!"
+  file:_ <- getArgs
+  pgf <- readPGF file
+  let dict = pgf2dict pgf
+  let st0 = new (startCat pgf)
+  editLoop pgf dict st0
+
+editLoop :: PGF -> Dict -> State -> IO State
+editLoop pgf dict st = do
+  putStrLn ("I want something of type " ++ prCId (focusType st))
+  c   <- getLine
+  st' <- interpret pgf dict st c
+  let t = etree2tree (tree st')
+  putStrLn (unlines ([
+    "Now I have",
+     showTree t] ++ 
+     linearizeAll pgf t))
+  editLoop pgf dict st'
+
+interpret :: PGF -> Dict -> State -> String -> IO State
+interpret pgf dict st c = case words c of
+  "r":f:_ -> do
+    return $ goNextMeta (refine dict (mkCId f) st)
+  "m":_   -> do
+    putStrLn (unwords (map (prCId . fst) (refineMenu dict st)))
+    return st
+  _ -> do
+    putStrLn "command not understood"
+    return st
+
+