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Simple implementation

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Akshay Mankar 2024-06-01 10:45:38 +02:00
commit 464848e69f
Signed by: axeman
GPG key ID: CA08F3AB62369B89
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watch_file flake.nix
watch_file flake.lock
use flake ".#dev-env";

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dist-newstyle
.direnv
.dir-locals.el
result

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# Revision history for gpn-tron
## 0.1.0.0 -- YYYY-mm-dd
* First version. Released on an unsuspecting world.

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# tronly-typed
A strongly-typed competitor for [gpn-tron](https://github.com/freehuntx/gpn-tron/)
# How to run
1. Compile using `nix build`
2. Run using `./result/bin/tronly-typed --host <host> --port <tcp-port> --username <username> --password <password>`

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app/Main.hs Normal file
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{-# LANGUAGE DuplicateRecordFields #-}
{-# LANGUAGE LambdaCase #-}
{-# LANGUAGE OverloadedRecordDot #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE StrictData #-}
module Main where
import Control.Monad.Reader
import Control.Monad.State
import Data.Attoparsec.ByteString.Char8 as Atto
import Data.ByteString (ByteString)
import Data.ByteString qualified as BS
import Data.ByteString.Char8 qualified as BC8
import Data.Functor (void)
import Data.Map.Strict (Map)
import Data.Map.Strict qualified as Map
import Debug.Trace
import GHC.Generics
import Network.Run.TCP
import Network.Socket
import Network.Socket.ByteString qualified as Socket
import Options.Generic
import Data.ByteString.UTF8 (fromString)
import Data.List.Extra
import Data.Maybe (mapMaybe)
main :: IO ()
main = gameLoop
data Server = Server
{ host :: HostName,
port :: ServiceName,
username :: String,
password :: String
}
deriving (Show, Eq, Generic)
instance ParseRecord Server
data GameState = GameState
{ game :: Game,
occupied :: Map (Int, Int) Int,
lastPosition :: (Int, Int),
otherPlayers :: Map Int String
}
newtype ParserError = ParserError (Result Packet)
deriving (Show)
gameLoop :: IO ()
gameLoop = do
server <- getRecord "Tronly Typed"
runTCPClient server.host server.port $ \sock -> do
putStrLn "Connected"
go sock server initState ""
where
go :: Socket -> Server -> GameState -> ByteString -> IO ()
go sock server gs bs = do
parsePacket sock bs >>= \case
Left e -> error $ "ParserError: " <> show e
Right (receivedPkt, remaining) -> do
showGameUpdates gs receivedPkt
let (action, newState) = runReader (runStateT (processPacket receivedPkt) gs) server
case action of
Chill -> go sock server newState remaining
GameOver True score -> do
putStrLn "Victory 🎉"
putStrLn $ "wins: " <> show score.wins <> ", loses: " <> show score.loses
go sock server initState remaining
GameOver False score -> do
putStrLn "Oh well, we lost!"
putStrLn $ "wins: " <> show score.wins <> ", loses: " <> show score.loses
go sock server initState remaining
Error err ->
putStrLn $ "Error :" <> err
SendPacket pktToSend -> do
sendPacket sock pktToSend
go sock server newState remaining
SayGoodBye deaths -> do
case mapMaybe (\d -> Map.lookup d gs.otherPlayers) deaths of
[] -> pure ()
[dead] -> sendPacket sock $ ChatPacket $ "Snek ya later " <> dead
(p:ps) -> sendPacket sock $ ChatPacket $ "Snek ya later " <> intercalate ", " ps <> " and " <> p
go sock server newState remaining
GiveUp -> do
sendPacket sock $ ChatPacket "I don't know what to do! My whole brain is crying!"
sendPacket sock $ MovePacket DirUp
go sock server newState remaining
showGameUpdates :: GameState -> Packet -> IO ()
showGameUpdates gs = \case
GamePacket game ->
putStrLn $ "Game starts, we're player " <> show game.playerId
TickPacket ->
putStrLn $ showGame gs.game.height gs.game.width gs.occupied
PlayerPacket player ->
putStrLn $ "Player " <> show player.playerId <> " is " <> show player.name
DiePacket players ->
putStrLn $ "Player " <> show players <> " are dead"
_ -> pure ()
sendPacket :: Socket -> Packet -> IO ()
sendPacket sock pkt = do
let serialised = serialisePacket pkt
BC8.putStrLn $ "Sending packet: " <> serialised
void $ Socket.send sock serialised
initState :: GameState
initState =
GameState
{ game = Game 0 0 (-1),
lastPosition = (0, 0),
occupied = mempty,
otherPlayers = mempty
}
parsePacket :: Socket -> ByteString -> IO (Either ParserError (Packet, ByteString))
parsePacket sock previous = go (parse packetParser previous)
where
go :: IResult ByteString Packet -> IO (Either ParserError (Packet, ByteString))
go parseFn = do
case parseFn of
Done remaining packet -> do
pure (Right (packet, remaining))
Partial f -> do
moreInput <- Socket.recv sock 1024
go $ f moreInput
res -> pure $ Left $ ParserError res
mkJoinPacket :: Server -> Packet
mkJoinPacket gs = JoinPacket $ Join gs.username gs.password
processPacket :: (MonadState GameState m, MonadReader Server m) => Packet -> m Action
processPacket incomingPacket = do
case incomingPacket of
MOTDPacket _ ->
asks (SendPacket . mkJoinPacket)
GamePacket game -> do
modify (\gs -> gs {game = game})
pure Chill
PlayerPacket player -> do
modify (\gs -> gs { otherPlayers = Map.insert player.playerId player.name gs.otherPlayers })
pure Chill
PosPacket pos -> do
modify
( \gs ->
gs
{ occupied = Map.insert (pos.x, pos.y) pos.playerId gs.occupied,
lastPosition =
if pos.playerId == gs.game.playerId
then (pos.x, pos.y)
else gs.lastPosition
}
)
pure Chill
DiePacket deaths -> do
modify (\gs -> gs {occupied = Map.filter (not . flip elem deaths) gs.occupied})
pure $ SayGoodBye deaths
WinPacket score -> do
pure $ GameOver True score
LosePacket score ->
pure $ GameOver False score
ErrorPacket err ->
pure $ Error err
TickPacket -> do
gs <- get
-- pure $ SendPacket $ MovePacket $ nextMove gs.game.height gs.game.width (Map.keys gs.occupied) gs.lastPosition
case nextMove gs.game.height gs.game.width (Map.keys gs.occupied) gs.lastPosition of
Nothing -> pure GiveUp
Just dir -> pure $ SendPacket $ MovePacket dir
UnknownPacket unknown -> do
traceM $ "Unknown packet: " <> BC8.unpack unknown
pure Chill
_ ->
pure Chill
nextMove :: Int -> Int -> [(Int, Int)] -> (Int, Int) -> Maybe Direction
nextMove height width occupiedSpaces (x, y) =
let isOccupied p = p `elem` occupiedSpaces
closest :: Int -> ((Int, Int) -> (Int, Int)) -> (Int, Int) -> Int
closest n next cur = if isOccupied cur then n else closest (1 + n) next (next cur)
nextIn DirUp (x0, y0) = (x0, (y0 - 1) `mod` height)
nextIn DirDown (x0, y0) = (x0, (y0 + 1) `mod` height)
nextIn DirRight (x0, y0) = ((x0 + 1) `mod` width, y0)
nextIn DirLeft (x0, y0) = ((x0 - 1) `mod` width, y0)
freeSquaresIn dir = closest 0 (nextIn dir) (nextIn dir (x,y))
freeSquares = map (\dir -> (dir, freeSquaresIn dir)) [DirUp, DirRight, DirDown, DirLeft]
maxFreeSquares = maximum $ map snd freeSquares
in case maxFreeSquares of
0 -> Nothing
_ -> Just . fst $ maximumOn snd freeSquares
showGame :: Int -> Int -> Map (Int, Int) Int -> String
showGame height width occ =
let row y = unwords [maybe "." show $ Map.lookup (x, y) occ | x <- [0 .. width - 1]]
grid = unlines [row x | x <- [0 .. height - 1]]
in grid
data Action = SendPacket Packet | Chill | SayGoodBye [Int] | GameOver Bool Score | Error String | GiveUp
data Packet
= MOTDPacket String
| JoinPacket Join
| ErrorPacket String
| GamePacket Game
| PosPacket Pos
| PlayerPacket Player
| TickPacket
| DiePacket [Int]
| MovePacket Direction
| ChatPacket String
| MessagePacket Message
| WinPacket Score
| LosePacket Score
| UnknownPacket ByteString
deriving (Show)
packetParser :: Parser Packet
packetParser = do
packetName <- Atto.takeWhile (\c -> c /= '|' && c /= '\n')
packet <- case packetName of
"motd" -> MOTDPacket <$ char '|' <*> strParser '\n'
"join" -> JoinPacket <$ char '|' <*> joinParser
"error" -> ErrorPacket <$ char '|' <*> strParser '\n'
"game" -> GamePacket <$ char '|' <*> gameParser
"pos" -> PosPacket <$ char '|' <*> posParser
"player" -> PlayerPacket <$ char '|' <*> playerParser
"tick" -> pure TickPacket
"die" -> DiePacket <$ char '|' <*> sepBy1 decimal (char '|')
"move" -> MovePacket <$ char '|' <*> directionParser
"chat" -> ChatPacket <$ char '|' <*> strParser '\n'
"message" -> MessagePacket <$ char '|' <*> messageParser
"win" -> WinPacket <$ char '|' <*> scoreParser
"lose" -> LosePacket <$ char '|' <*> scoreParser
unknown -> UnknownPacket . (unknown <>) <$> Atto.takeWhile (/= '\n')
_ <- char '\n'
pure packet
serialisePacket :: Packet -> ByteString
serialisePacket =
(<> "\n") . BS.intercalate "|" . \case
MOTDPacket motd -> ["motd", fromString motd]
JoinPacket (Join username password) -> ["join", fromString username, fromString password]
ErrorPacket e -> ["error", fromString e]
GamePacket (Game w h p) -> ["game", fromString (show w), fromString (show h), fromString (show p)]
PosPacket (Pos x y p) -> ["pos", fromString (show x), fromString (show y), fromString (show p)]
PlayerPacket (Player p n) -> ["player", fromString (show p), fromString n]
TickPacket -> ["tick"]
DiePacket dead -> ["die", fromString (show dead)]
MovePacket DirUp -> ["move", "up"]
MovePacket DirDown -> ["move", "down"]
MovePacket DirRight -> ["move", "right"]
MovePacket DirLeft -> ["move", "left"]
ChatPacket msg -> ["chat", fromString msg]
MessagePacket (Message p msg) -> ["message", fromString (show p), fromString msg]
WinPacket (Score w l) -> ["win", fromString (show w), fromString (show l)]
LosePacket (Score w l) -> ["lose", fromString (show w), fromString (show l)]
UnknownPacket str -> [str]
strParser :: Char -> Parser String
strParser stopper =
BC8.unpack <$> Atto.takeWhile (/= stopper)
data Join = Join
{ username :: String,
password :: String
}
deriving (Show)
joinParser :: Parser Join
joinParser =
Join
<$> (BC8.unpack <$> Atto.takeWhile (/= '|'))
<* char '|'
<*> (BC8.unpack <$> Atto.takeWhile (/= '\n'))
data Game = Game
{ width :: Int,
height :: Int,
playerId :: Int
}
deriving (Show)
gameParser :: Parser Game
gameParser =
Game
<$> decimal
<* char '|'
<*> decimal
<* char '|'
<*> decimal
data Pos = Pos
{ playerId :: Int,
x :: Int,
y :: Int
}
deriving (Show)
posParser :: Parser Pos
posParser =
Pos
<$> decimal
<* char '|'
<*> decimal
<* char '|'
<*> decimal
data Player = Player
{ playerId :: Int,
name :: String
}
deriving (Show)
playerParser :: Parser Player
playerParser =
Player
<$> decimal
<* char '|'
<*> (BC8.unpack <$> Atto.takeWhile (/= '\n'))
data Direction = DirUp | DirDown | DirRight | DirLeft
deriving (Show)
directionParser :: Parser Direction
directionParser =
Atto.takeWhile (/= '\n') >>= \case
"up" -> pure DirUp
"down" -> pure DirDown
"right" -> pure DirRight
"left" -> pure DirLeft
invalidDir -> fail $ "Invalid direction: " <> BC8.unpack invalidDir
data Message = Message
{ playerId :: Int,
message :: String
}
deriving (Show)
messageParser :: Parser Message
messageParser =
Message
<$> decimal
<* char '|'
<*> (BC8.unpack <$> Atto.takeWhile (/= '\n'))
data Score = Score
{ wins :: Int,
loses :: Int
}
deriving (Show)
scoreParser :: Parser Score
scoreParser =
Score
<$> decimal
<* char '|'
<*> decimal

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cabal.project.local Normal file
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optimization: False
test-show-details: always
test-options: --color
package tronly-typed
ghc-options: -Wall

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default.nix Normal file
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{ mkDerivation, attoparsec, base, bytestring, containers, extra
, lib, mtl, network, network-run, optparse-generic, text
, utf8-string
}:
mkDerivation {
pname = "tronly-typed";
version = "0.1.0.0";
src = ./.;
isLibrary = false;
isExecutable = true;
executableHaskellDepends = [
attoparsec base bytestring containers extra mtl network network-run
optparse-generic text utf8-string
];
license = lib.licenses.agpl3Plus;
mainProgram = "gpn-tron";
}

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{
"nodes": {
"flake-utils": {
"inputs": {
"systems": "systems"
},
"locked": {
"lastModified": 1710146030,
"narHash": "sha256-SZ5L6eA7HJ/nmkzGG7/ISclqe6oZdOZTNoesiInkXPQ=",
"owner": "numtide",
"repo": "flake-utils",
"rev": "b1d9ab70662946ef0850d488da1c9019f3a9752a",
"type": "github"
},
"original": {
"owner": "numtide",
"repo": "flake-utils",
"type": "github"
}
},
"nixpkgs": {
"locked": {
"lastModified": 1717070961,
"narHash": "sha256-0JN98HVWPMlxj48Ot9K3eF0CWfwvo7/7VAYO+VAHg1Q=",
"owner": "NixOS",
"repo": "nixpkgs",
"rev": "aa61b27554a5fc282758bf0324781e3464ef2cde",
"type": "github"
},
"original": {
"owner": "NixOS",
"ref": "nixpkgs-unstable",
"repo": "nixpkgs",
"type": "github"
}
},
"root": {
"inputs": {
"flake-utils": "flake-utils",
"nixpkgs": "nixpkgs"
}
},
"systems": {
"locked": {
"lastModified": 1681028828,
"narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
"owner": "nix-systems",
"repo": "default",
"rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
"type": "github"
},
"original": {
"owner": "nix-systems",
"repo": "default",
"type": "github"
}
}
},
"root": "root",
"version": 7
}

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flake.nix Normal file
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{
description = "Dev Setup";
inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
inputs.flake-utils.url = "github:numtide/flake-utils";
outputs = {nixpkgs, flake-utils, ...}:
flake-utils.lib.eachDefaultSystem (system:
let
pkgs = import nixpkgs { inherit system; };
# Avoids unnecessary recompiles
filteredSource = pkgs.lib.cleanSourceWith {
src = ./.;
filter = path: type:
let baseName = baseNameOf (toString path);
in pkgs.lib.cleanSourceFilter path type && !(
baseName == "flake.nix" ||
baseName == "flake.lock" ||
baseName == "dist-newstyle" ||
builtins.match "^cabal\.project\..*$" baseName != null ||
baseName == "hls.sh" ||
baseName == ".envrc" ||
baseName == "hie.yaml" ||
baseName == ".hlint.yaml" ||
baseName == ".hspec" ||
baseName == "ci"
);
};
ghcOverrides = hself: hsuper: rec {
tronly-typed = pkgs.haskell.lib.overrideSrc (hsuper.callPackage ./default.nix {}) {
src = filteredSource;
};
};
ghc96Pkgs = pkgs.haskell.packages.ghc96.override {
overrides = ghcOverrides;
};
in rec {
packages = rec {
dev-env = ghc96Pkgs.shellFor {
packages = p: [p.tronly-typed];
buildInputs = [
pkgs.haskellPackages.cabal-install
pkgs.haskell-language-server
pkgs.haskellPackages.implicit-hie
pkgs.cabal2nix
pkgs.ormolu
# For cabal
pkgs.pkg-config
pkgs.binutils
];
};
tronly-typed = ghc96Pkgs.tronly-typed;
};
defaultPackage = packages.tronly-typed;
});
}

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#!/usr/bin/env bash
set -euo pipefail
DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
direnv exec "$DIR" haskell-language-server-wrapper "$@"

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tronly-typed.cabal Normal file
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cabal-version: 3.0
name: tronly-typed
version: 0.1.0.0
license: AGPL-3.0-or-later
license-file: LICENSE
author: Akshay Mankar
maintainer: itsakshaymankar@gmail.com
category: Game
build-type: Simple
extra-doc-files: CHANGELOG.md
common warnings
ghc-options: -Wall
executable tronly-typed
import: warnings
main-is: Main.hs
hs-source-dirs: app
default-language: GHC2021
build-depends: base ^>=4.18.2.1
, bytestring
, extra
, attoparsec
, mtl
, containers
, optparse-generic
, text
, network
, network-run
, utf8-string