diff --git a/HaltaVista/Hoogle.hs b/HaltaVista/Hoogle.hs new file mode 100644 --- /dev/null +++ b/HaltaVista/Hoogle.hs @@ -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 "" diff --git a/HaltaVista/Match.hs b/HaltaVista/Match.hs new file mode 100644 --- /dev/null +++ b/HaltaVista/Match.hs @@ -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 + + + diff --git a/HaltaVista/TypeInference.hs b/HaltaVista/TypeInference.hs new file mode 100644 --- /dev/null +++ b/HaltaVista/TypeInference.hs @@ -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 " diff --git a/HaltaVista/Types.hs b/HaltaVista/Types.hs new file mode 100644 --- /dev/null +++ b/HaltaVista/Types.hs @@ -0,0 +1,6 @@ +module HaltaVista.Types where + +type Input = String +type Output = String +type Answer = (String, String) +type Type = String diff --git a/LICENSE b/LICENSE new file mode 100644 --- /dev/null +++ b/LICENSE @@ -0,0 +1,339 @@ + GNU GENERAL PUBLIC LICENSE + Version 2, June 1991 + + Copyright (C) 1989, 1991 Free Software Foundation, Inc., + 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The licenses for most software are designed to take away your +freedom to share and change it. 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If this is what you want to do, use the GNU Lesser General +Public License instead of this License. diff --git a/Main.hs b/Main.hs new file mode 100644 --- /dev/null +++ b/Main.hs @@ -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 diff --git a/README.md b/README.md new file mode 100644 --- /dev/null +++ b/README.md @@ -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 + + + Prelude (*) + Prelude (+) + Prelude (^) + +Example session 2 (refining search 1): + + brauner@worf:~$ haltavista + 2 2 4 + 1 2 3 + + + Prelude (+) + +Example session 3 (higher-order functions): + + brauner@worf:~$ haltavista + (+1) (+2) (1,1) (2,3) + + + 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 diff --git a/Setup.hs b/Setup.hs new file mode 100644 --- /dev/null +++ b/Setup.hs @@ -0,0 +1,2 @@ +import Distribution.Simple +main = defaultMain diff --git a/haltavista.cabal b/haltavista.cabal new file mode 100644 --- /dev/null +++ b/haltavista.cabal @@ -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 + > + + Example usage: + + > ~$ haltavista + > 1 1 2 + > 1 2 3 + > + > + > 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 +