haltavista (empty) → 0.1

raw patch · 9 files changed

+581/−0 lines, 9 filesdep +basedep +hintdep +processsetup-changed

Dependencies added: base, hint, process

Files

• HaltaVista/Hoogle.hs +32/−0
• HaltaVista/Match.hs +40/−0
• HaltaVista/TypeInference.hs +25/−0
• HaltaVista/Types.hs +6/−0
• LICENSE +339/−0
• Main.hs +34/−0
• README.md +56/−0
• Setup.hs +2/−0
• haltavista.cabal +47/−0

@@ -0,0 +1,32 @@+-- | copy-pasted from Yi.Hoogle and modified++module HaltaVista.Hoogle (hoogle) where++import System.Exit (ExitCode(ExitFailure))+import System.Process+import Data.List(isInfixOf)+import Control.Monad(when)+import Control.Arrow((&&&))+import Control.Applicative((<$>))++-- | Hoogle's output includes a sort of type keyword, telling whether a hit is a package name, syntax,+-- a module name, etc. But we care primarily about the function names, so we filter out anything containing+-- the keywords.+gv :: [String] -> [String]+gv = filter f+  where f x = not $ any (`isInfixOf` x) ["module ", " type ", "package ", " data ", " keyword "]++-- | Query Hoogle, with given search and options. This errors out on no+-- results or if the hoogle command is not on path.+hoogleRaw :: String -> String -> IO [String]+hoogleRaw srch opts = do (status,out,err) <- readProcessWithExitCode "hoogle" [opts, srch] ""+                         return $ if (status == ExitFailure 1) +                                    then []+                                    else let results = lines out+                                         in if results == ["No results found"] +                                              then [] +                                              else results++-- | Return module-function pairs.+hoogle :: String -> IO [(String, String)]+hoogle a = map ((head &&& (!! 1)) . words) . gv  <$> hoogleRaw a ""

@@ -0,0 +1,40 @@+module HaltaVista.Match (matches) where++import HaltaVista.Types+import qualified Language.Haskell.Interpreter as I+import Control.Monad((<=<))+import Data.List+import System.Timeout(timeout)+import Control.Exception(handle, SomeException)++thres = 1500000++matches :: (String,String) -> [([Input], Output)] -> IO Bool+matches (m,f) ios = do x <- handle guard $+                            coerceJust `fmap` timeout thres command+                       return x+    where command :: IO Bool+          command = do res <- I.runInterpreter $ do I.setImports ["Prelude", m]+                                                    check f ios+                       {- runInterpreter returns Right x if the evaluation+                        - throws an exception.  To ensure this x is evaluated+                        - (and the exception thrown) within `command', we need+                        - to seq it here. -}+                       case res of+                         Right x -> x `seq` return x+                         _       -> return False+          guard :: SomeException -> IO Bool+          guard _ = return False+          coerceJust (Just b) = b+          coerceJust Nothing  = False++input f = prefix . intercalate " " . map I.parens+  where prefix x = f ++ " " ++ x++run f ios = mapM (I.eval . input f) ios++check f ios = (and . zipWith (==) os) `fmap` run f is+  where (is,os) = unzip ios+++

@@ -0,0 +1,25 @@+module HaltaVista.TypeInference (infer) where++import HaltaVista.Types+import Language.Haskell.Interpreter hiding (infer)+import Data.List+import Control.Exception(throw)++convert (Left e)  = Left "wrong input"+convert (Right x) = Right (unwords $ lines x)++load = do setImports ["Prelude"]+          set [installedModulesInScope := True]++infer :: [([Input],Output)] -> IO (Either String Type)+infer ios = runInterpreter (load >> typeOf (synth ios)) >>= return . convert++synth :: [([Input],Output)] -> String+synth ios = prelude ++ "let " ++ body (map clause ios) ++ " in foo"+  where body xs = "{" ++ intercalate ";" xs ++ "}"+        args = map (("haltavista_x"++).show) [1..length (fst.head $ ios)]+        lhs = "foo " ++ unwords args+        clause (is,o) = lhs ++ " = let " ++ body (zipWith constr args is) ++ " in " ++ parens o+        constr a i = "() = equate " ++ a ++ " " ++ parens i++prelude = "let equate = (undefined :: a -> a -> ()) in "

@@ -0,0 +1,6 @@+module HaltaVista.Types where++type Input  = String+type Output = String+type Answer = (String, String)+type Type   = String

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@@ -0,0 +1,34 @@+import HaltaVista.Types+import HaltaVista.TypeInference+import HaltaVista.Hoogle+import HaltaVista.Match++import Control.Monad(filterM, when)++suffix = reverse . takeWhile (/= '.') . reverse++search :: [([Input], Output)] -> IO [Answer]+search ios = do+  mty <- infer ios+  case mty of+    Left e   -> error (show e)+    Right ty -> do+      --putStrLn ("ty = " ++ (suffix ty))+      hoogle (suffix ty)++split xs = split' [] xs+  where split' acc [x]    = (reverse acc,x)+        split' acc (x:xs) = split' (x:acc) xs++parse :: String -> [([Input], Output)]+parse = map split . map words . lines ++pretty :: Answer -> String+pretty (x,y) = x ++ " " ++ y++main = do+  ios <- parse `fmap` getContents+  candidates <- search ios+  let pp cand = do ok <- matches cand ios+                   when ok $ putStrLn $ pretty cand+  mapM_ pp candidates

@@ -0,0 +1,56 @@+# Haltavista #++Search for haskell functions in installed libraries by providing input/output+examples.++## Requirements ##++[Hoogle] has to be installed.++## Usage ##++Example session 1:++    brauner@worf:~$ haltavista+    2 2 4+    <EOF>++    Prelude (*)+    Prelude (+)+    Prelude (^)++Example session 2 (refining search 1):++    brauner@worf:~$ haltavista+    2 2 4+    1 2 3+    <EOF>++    Prelude (+)++Example session 3 (higher-order functions):++    brauner@worf:~$ haltavista +    (+1) (+2) (1,1) (2,3)+    <EOF>++    Data.Graph.Inductive.Query.Monad (><)++## Credits ##++Under the hood, uses:++  - hint for type inference;+  - hoogle to get a list of candidate functions;+  - hint for testing.++Hoogle calling facility has been copy-pasted (and later modified) from the [Yi]+project.++## Todo ##++- catch stack overflows (is that possible?)+- catch other errors (should do but doesn't for some reason)++[Hoogle]: http://hackage.haskell.org/package/hoogle+[Yi]: http://www.haskell.org/haskellwiki/Yi

@@ -0,0 +1,2 @@+import Distribution.Simple+main = defaultMain

@@ -0,0 +1,47 @@+Name:                haltavista+Version:             0.1+Synopsis:            looks for functions given a set of example input/outputs+Stability:           alpha+Description:++  Looks for functions in the local hoogle library given a set of example input/outputs.+  Requires hoogle.++  Usage:++  > ~$ haltavista+  > input_1_1 ... input_1_n output_1+  > ...+  > input_m_1 ... input_m_n output_m+  > <EOF>++  Example usage:+  +  > ~$ haltavista+  > 1 1 2+  > 1 2 3+  > <EOF> +  >+  > Prelude (+)++  See README.md for more examples.++License:             GPL-2+License-file:        LICENSE+Author:              Paul Brauner+                     Jun Inoue+Maintainer:          polux2001@gmail.com+Copyright:           Paul Brauner and Jun Inoue +Category:            Development+Build-type:          Simple++Extra-source-files: README.md+Cabal-version:       >=1.4+Executable haltavista+  Main-is: Main.hs+  Build-depends: base >= 4 && <5, hint >= 0.3.2.3, process >= 1.0.1.3+  Other-modules: HaltaVista.Types+                 HaltaVista.TypeInference  +                 HaltaVista.Hoogle+                 HaltaVista.Match+