231 lines
6.7 KiB
Haskell
231 lines
6.7 KiB
Haskell
{- This code was authored by:
|
|
|
|
Stephen Diehl
|
|
Kwang Yul Seo <kwangyul.seo@gmail.com>
|
|
|
|
It was made available under the MIT license. See the src/Nix/Type
|
|
directory for more details.
|
|
-}
|
|
|
|
{-# LANGUAGE FlexibleContexts #-}
|
|
{-# LANGUAGE FlexibleInstances #-}
|
|
{-# LANGUAGE LambdaCase #-}
|
|
{-# LANGUAGE MultiWayIf #-}
|
|
{-# LANGUAGE CPP #-}
|
|
{-# LANGUAGE OverloadedStrings #-}
|
|
{-# LANGUAGE ScopedTypeVariables #-}
|
|
{-# LANGUAGE TypeApplications #-}
|
|
{-# LANGUAGE TypeSynonymInstances #-}
|
|
|
|
{-# OPTIONS_GHC -Wno-unused-matches #-}
|
|
{-# OPTIONS_GHC -Wno-unused-imports #-}
|
|
|
|
module Repl where
|
|
|
|
import Nix hiding ( exec
|
|
, try
|
|
)
|
|
import Nix.Builtins ( MonadBuiltins )
|
|
import Nix.Cited
|
|
import Nix.Convert
|
|
import Nix.Eval
|
|
import Nix.Scope
|
|
import qualified Nix.Type.Env as Env
|
|
import Nix.Type.Infer
|
|
import Nix.Utils
|
|
|
|
import Control.Comonad
|
|
import qualified Data.HashMap.Lazy as M
|
|
import Data.List ( isPrefixOf
|
|
, foldl'
|
|
)
|
|
import qualified Data.Map as Map
|
|
import Data.Monoid
|
|
import Data.Text ( unpack
|
|
, pack
|
|
)
|
|
import qualified Data.Text as Text
|
|
import qualified Data.Text.IO as Text
|
|
import Data.Version ( showVersion )
|
|
import Paths_hnix ( version )
|
|
|
|
import Control.Monad.Catch
|
|
import Control.Monad.Identity
|
|
import Control.Monad.Reader
|
|
import Control.Monad.State.Strict
|
|
|
|
import System.Console.Haskeline.MonadException
|
|
import System.Console.Repline
|
|
import System.Environment
|
|
import System.Exit
|
|
|
|
|
|
main :: (MonadBuiltins e t f m, MonadIO m, MonadException m) => m ()
|
|
main = flip evalStateT initState
|
|
#if MIN_VERSION_repline(0, 2, 0)
|
|
$ evalRepl (return prefix) cmd options (Just ':') completer welcomeText
|
|
#else
|
|
$ evalRepl prefix cmd options completer welcomeText
|
|
#endif
|
|
where
|
|
prefix = "hnix> "
|
|
welcomeText =
|
|
liftIO
|
|
$ putStrLn
|
|
$ "Welcome to hnix "
|
|
<> showVersion version
|
|
<> ". For help type :help\n"
|
|
|
|
-------------------------------------------------------------------------------
|
|
-- Types
|
|
-------------------------------------------------------------------------------
|
|
|
|
newtype IState t f m = IState
|
|
{ tmctx :: AttrSet (NValue t f m) -- Value environment
|
|
}
|
|
|
|
initState :: MonadIO m => IState t f m
|
|
initState = IState M.empty
|
|
|
|
type Repl e t f m = HaskelineT (StateT (IState t f m) m)
|
|
hoistErr :: MonadIO m => Result a -> Repl e t f m a
|
|
hoistErr (Success val) = return val
|
|
hoistErr (Failure err) = do
|
|
liftIO $ print err
|
|
abort
|
|
|
|
-------------------------------------------------------------------------------
|
|
-- Execution
|
|
-------------------------------------------------------------------------------
|
|
|
|
exec
|
|
:: forall e t f m
|
|
. (MonadBuiltins e t f m, MonadIO m, MonadException m)
|
|
=> Bool
|
|
-> Text.Text
|
|
-> Repl e t f m (NValue t f m)
|
|
exec update source = do
|
|
-- Get the current interpreter state
|
|
st <- get
|
|
|
|
-- Parser ( returns AST )
|
|
-- TODO: parse <var> = <expr>
|
|
expr <- hoistErr $ parseNixTextLoc source
|
|
|
|
-- Type Inference ( returns Typing Environment )
|
|
-- tyctx' <- hoistErr $ inferTop (tyctx st) expr
|
|
|
|
-- TODO: track scope with (tmctx st)
|
|
mVal <- lift $ lift $ try $ pushScope @t M.empty (evalExprLoc expr)
|
|
|
|
case mVal of
|
|
Left (NixException frames) -> do
|
|
lift $ lift $ liftIO . print =<< renderFrames @(NValue t f m) @t frames
|
|
abort
|
|
Right val -> do
|
|
-- Update the interpreter state
|
|
when update $ do
|
|
-- Create the new environment
|
|
put st { tmctx = tmctx st } -- TODO: M.insert key val (tmctx st)
|
|
return val
|
|
|
|
|
|
cmd
|
|
:: (MonadBuiltins e t f m, MonadIO m, MonadException m)
|
|
=> String
|
|
-> Repl e t f m ()
|
|
cmd source = do
|
|
val <- exec True (Text.pack source)
|
|
lift $ lift $ do
|
|
opts :: Nix.Options <- asks (view hasLens)
|
|
if
|
|
| strict opts -> liftIO . print . prettyNValueNF =<< normalForm val
|
|
| values opts -> liftIO . print =<< prettyNValueProv val
|
|
| otherwise -> liftIO . print =<< prettyNValue val
|
|
-------------------------------------------------------------------------------
|
|
-- Commands
|
|
-------------------------------------------------------------------------------
|
|
|
|
-- :browse command
|
|
browse :: MonadBuiltins e t f m => [String] -> Repl e t f m ()
|
|
browse _ = do
|
|
st <- get
|
|
undefined
|
|
-- liftIO $ mapM_ putStrLn $ ppenv (tyctx st)
|
|
|
|
-- :load command
|
|
load
|
|
:: (MonadBuiltins e t f m, MonadIO m, MonadException m)
|
|
=> [String]
|
|
-> Repl e t f m ()
|
|
load args = do
|
|
contents <- liftIO $ Text.readFile (unwords args)
|
|
void $ exec True contents
|
|
|
|
-- :type command
|
|
typeof
|
|
:: (MonadBuiltins e t f m, MonadException m, MonadIO m)
|
|
=> [String]
|
|
-> Repl e t f m ()
|
|
typeof args = do
|
|
st <- get
|
|
val <- case M.lookup line (tmctx st) of
|
|
Just val -> return val
|
|
Nothing -> exec False line
|
|
liftIO $ putStrLn $ describeValue . valueType . extract . _nValue $ val
|
|
where line = Text.pack (unwords args)
|
|
|
|
-- :quit command
|
|
quit :: (MonadBuiltins e t f m, MonadIO m) => a -> Repl e t f m ()
|
|
quit _ = liftIO exitSuccess
|
|
|
|
-------------------------------------------------------------------------------
|
|
-- Interactive Shell
|
|
-------------------------------------------------------------------------------
|
|
|
|
-- Prefix tab completer
|
|
defaultMatcher :: MonadIO m => [(String, CompletionFunc m)]
|
|
defaultMatcher =
|
|
[(":load", fileCompleter)
|
|
--, (":type" , values)
|
|
]
|
|
|
|
-- Default tab completer
|
|
comp :: Monad m => WordCompleter m
|
|
comp n = do
|
|
let cmds = [":load", ":type", ":browse", ":quit"]
|
|
-- Env.TypeEnv ctx <- gets tyctx
|
|
-- let defs = map unpack $ Map.keys ctx
|
|
return $ filter (isPrefixOf n) (cmds {-++ defs-}
|
|
)
|
|
|
|
options
|
|
:: (MonadBuiltins e t f m, MonadIO m, MonadException m)
|
|
=> [(String, [String] -> Repl e t f m ())]
|
|
options =
|
|
[ ( "load"
|
|
, load
|
|
)
|
|
--, ("browse" , browse)
|
|
, ("quit", quit)
|
|
, ("type", typeof)
|
|
, ("help", help)
|
|
]
|
|
|
|
help
|
|
:: forall e t f m
|
|
. (MonadBuiltins e t f m, MonadIO m, MonadException m)
|
|
=> [String]
|
|
-> Repl e t f m ()
|
|
help _ = liftIO $ do
|
|
putStrLn "Available commands:\n"
|
|
mapM_ putStrLn $ map (\o -> ":" ++ (fst o)) (options @e @t @f @m)
|
|
|
|
completer
|
|
:: (MonadBuiltins e t f m, MonadIO m)
|
|
=> CompleterStyle (StateT (IState t f m) m)
|
|
completer = Prefix (wordCompleter comp) defaultMatcher
|
|
|
|
|
|
|