Initial commit

.gitignore

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+.idea
+*.iml
+.stack-work

Setup.hs

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+import Distribution.Simple
+main = defaultMain

app/Main.hs

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+module Main where
+
+import           Lib
+
+main :: IO ()
+main = putStrLn $ printBoard (Board
+                      [ [Bomb Revealed, Value 1 Revealed, Value 0 Revealed]
+                      , [Value 1 Revealed, Value 1 Revealed, Value 0 Revealed]
+                      , [Value 0 Revealed, Value 0 Revealed, Value 0 Revealed]
+                      ])

minesweeper.cabal

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+cabal-version: 1.12
+
+-- This file has been generated from package.yaml by hpack version 0.31.1.
+--
+-- see: https://github.com/sol/hpack
+--
+-- hash: 73d25bfaacbe65c083033b14864aa14b133058ca0e7c877622a08afb39ca460c
+
+name:           minesweeper
+version:        0.1.0.0
+build-type:     Simple
+
+library
+  exposed-modules:
+      Lib
+  other-modules:
+      Paths_minesweeper
+  hs-source-dirs:
+      src/
+  ghc-options: -Wall
+  build-depends:
+      base
+    , containers
+  default-language: Haskell2010
+
+executable minesweeper
+  main-is: Main.hs
+  other-modules:
+      Paths_minesweeper
+  hs-source-dirs:
+      app/
+  ghc-options: -Wall
+  build-depends:
+      base
+    , minesweeper
+  default-language: Haskell2010
+
+test-suite minesweeper-test
+  type: exitcode-stdio-1.0
+  main-is: Spec.hs
+  other-modules:
+      Paths_minesweeper
+  hs-source-dirs:
+      test/
+  ghc-options: -Wall
+  build-depends:
+      base
+    , minesweeper
+    , tasty
+    , tasty-hunit
+  default-language: Haskell2010

package.yaml

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+name: minesweeper
+version: 0.1.0.0
+
+ghc-options: -Wall
+
+dependencies:
+  base
+
+library:
+  source-dirs: src/
+  exposed-modules:
+    Lib
+  dependencies:
+    - containers
+
+executables:
+  minesweeper:
+    source-dirs: app/
+    main: Main.hs
+    dependencies:
+      minesweeper
+
+tests:
+  minesweeper-test:
+    source-dirs: test/
+    main: Spec.hs
+    dependencies:
+      - minesweeper
+      - tasty
+      - tasty-hunit

src/Lib.hs

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+module Lib
+  ( flagTile
+  , printBoard
+  , Board(..)
+  , Tile(..)
+  , TileState(..)
+  ) where
+
+newtype Board =
+  Board
+    { unBoard :: [[Tile]]
+    }
+  deriving (Eq, Show)
+
+data Tile
+  = Value Int TileState
+  | Bomb TileState
+  deriving (Eq, Show)
+
+data TileState
+  = Revealed
+  | Flagged
+  | Hidden
+  deriving (Eq, Show)
+
+type Coordinates = (Int, Int)
+
+flagTile :: Board -> Coordinates -> Board
+flagTile (Board board) (x, y) =
+  case findTile (Board board) (x, y) of
+    (Just tile) -> flagHiddenTile tile
+    Nothing     -> Board board
+  where
+    flagHiddenTile (Value value Hidden) = replaceTile (Board board) (x, y) (Value value Flagged)
+    flagHiddenTile (Bomb Hidden) = replaceTile (Board board) (x, y) (Bomb Flagged)
+    flagHiddenTile _ = Board board
+
+replaceTile :: Board -> Coordinates -> Tile -> Board
+replaceTile (Board board) (x, y) tile =
+  let (firstRows, line:lastRows) = splitAt y board
+      (firstTiles, _:lastTiles) = splitAt x line
+   in Board $ firstRows ++ (firstTiles ++ tile : lastTiles) : lastRows
+
+findTile :: Board -> Coordinates -> Maybe Tile
+findTile (Board board) (x, y) =
+  if not (coordinatesExists (Board board) (x, y))
+    then Nothing
+    else Just $ board !! y !! x
+
+coordinatesExists :: Board -> Coordinates -> Bool
+coordinatesExists (Board board) (x, y) = isPositive && isYWithinTheBoard board && isXWithinTheBoard board
+  where
+    isPositive = x >= 0 && y >= 0
+    isYWithinTheBoard = (> y) . length
+    isXWithinTheBoard = any ((> x) . length)
+
+printBoard :: Board -> String
+printBoard (Board board) = concatMap printLine board
+  where
+    printLine line = concatMap printTile line ++ "\n"
+    printTile (Bomb Hidden) = "#"
+    printTile (Bomb Revealed) = "B"
+    printTile (Value _ Hidden) = "#"
+    printTile (Value x Revealed) = show x
+    printTile (Bomb Flagged) = "F"
+    printTile (Value _ Flagged) = "F"

stack.yaml

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+# This file was automatically generated by 'stack init'
+#
+# Some commonly used options have been documented as comments in this file.
+# For advanced use and comprehensive documentation of the format, please see:
+# https://docs.haskellstack.org/en/stable/yaml_configuration/
+
+# Resolver to choose a 'specific' stackage snapshot or a compiler version.
+# A snapshot resolver dictates the compiler version and the set of packages
+# to be used for project dependencies. For example:
+#
+# resolver: lts-3.5
+# resolver: nightly-2015-09-21
+# resolver: ghc-7.10.2
+#
+# The location of a snapshot can be provided as a file or url. Stack assumes
+# a snapshot provided as a file might change, whereas a url resource does not.
+#
+# resolver: ./custom-snapshot.yaml
+# resolver: https://example.com/snapshots/2018-01-01.yaml
+resolver: lts-14.14
+
+# User packages to be built.
+# Various formats can be used as shown in the example below.
+#
+# packages:
+# - some-directory
+# - https://example.com/foo/bar/baz-0.0.2.tar.gz
+#   subdirs:
+#   - auto-update
+#   - wai
+packages:
+- .
+# Dependency packages to be pulled from upstream that are not in the resolver.
+# These entries can reference officially published versions as well as
+# forks / in-progress versions pinned to a git hash. For example:
+#
+# extra-deps:
+# - acme-missiles-0.3
+# - git: https://github.com/commercialhaskell/stack.git
+#   commit: e7b331f14bcffb8367cd58fbfc8b40ec7642100a
+#
+# extra-deps: []
+
+# Override default flag values for local packages and extra-deps
+# flags: {}
+
+# Extra package databases containing global packages
+# extra-package-dbs: []
+
+# Control whether we use the GHC we find on the path
+# system-ghc: true
+#
+# Require a specific version of stack, using version ranges
+# require-stack-version: -any # Default
+# require-stack-version: ">=2.1"
+#
+# Override the architecture used by stack, especially useful on Windows
+# arch: i386
+# arch: x86_64
+#
+# Extra directories used by stack for building
+# extra-include-dirs: [/path/to/dir]
+# extra-lib-dirs: [/path/to/dir]
+#
+# Allow a newer minor version of GHC than the snapshot specifies
+# compiler-check: newer-minor

stack.yaml.lock

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+# This file was autogenerated by Stack.
+# You should not edit this file by hand.
+# For more information, please see the documentation at:
+#   https://docs.haskellstack.org/en/stable/lock_files
+
+packages: []
+snapshots:
+- completed:
+    size: 525663
+    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/14/14.yaml
+    sha256: 6edc48df46eb8bf7b861e98dd30d021a92c2e1820c9bb6528aac5d997b0e14ef
+  original: lts-14.14

test/Spec.hs

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+import           Lib
+import           Test.Tasty
+import           Test.Tasty.HUnit
+
+main :: IO ()
+main = defaultMain $ testGroup "Minesweeper tests" [flagTileTest]
+
+emptyBoard :: Board
+emptyBoard = Board [[]]
+
+hiddenBoard :: Board
+hiddenBoard =
+  Board
+    [ [Bomb Hidden, Value 1 Hidden, Value 0 Hidden]
+    , [Value 1 Hidden, Value 1 Hidden, Value 0 Hidden]
+    , [Value 0 Hidden, Value 0 Hidden, Value 0 Hidden]
+    ]
+
+revealedBoard :: Board
+revealedBoard =
+  Board
+    [ [Bomb Revealed, Value 1 Revealed, Value 0 Revealed]
+    , [Value 1 Revealed, Value 1 Revealed, Value 0 Revealed]
+    , [Value 0 Revealed, Value 0 Revealed, Value 0 Revealed]
+    ]
+
+flagTileTest :: TestTree
+flagTileTest =
+  testGroup
+    "Flag tile"
+    [ testCase "Empty board" $ flagTile emptyBoard (1, 1) @?= emptyBoard
+    , testCase "Flag bomb tile" $
+      flagTile hiddenBoard (0, 0) @?=
+      Board
+        [ [Bomb Flagged, Value 1 Hidden, Value 0 Hidden]
+        , [Value 1 Hidden, Value 1 Hidden, Value 0 Hidden]
+        , [Value 0 Hidden, Value 0 Hidden, Value 0 Hidden]
+        ]
+    , testCase "Flag value tile" $
+      flagTile hiddenBoard (2, 0) @?=
+      Board
+        [ [Bomb Hidden, Value 1 Hidden, Value 0 Flagged]
+        , [Value 1 Hidden, Value 1 Hidden, Value 0 Hidden]
+        , [Value 0 Hidden, Value 0 Hidden, Value 0 Hidden]
+        ]
+    , testCase "Flag revealed bomb tile" $ flagTile revealedBoard (0, 0) @?= revealedBoard
+    , testCase "Flag revealed value tile" $ flagTile revealedBoard (1, 2) @?= revealedBoard
+    ]
+