Add remaining haskell book exercises

Haskell-book/26/Morra/.gitignore

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+.stack-work/
+Morra.cabal
+*~

Haskell-book/26/Morra/Setup.hs

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+import Distribution.Simple
+main = defaultMain

Haskell-book/26/Morra/app/Main.hs

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+module Main where
+
+import Control.Monad
+import Control.Monad.Trans.State
+import System.Random
+import System.Console.ANSI (clearScreen)
+
+type Score = StateT (Integer, Integer) IO (Integer, Integer)
+
+yourTurn :: IO (Integer, Integer)
+yourTurn = do
+    putStrLn "Wie viele Finger zeigen Sie?"
+    shown <- liftM read getLine
+
+    putStrLn "Wie viele Finger wird der Gegner zeigen?"
+    guessed <- liftM read getLine
+
+    clearScreen
+
+    return (shown, guessed)
+
+
+aiTurn :: IO (Integer, Integer)
+aiTurn = do
+    gen1 <- getStdGen
+
+    let (shown, gen2) = randomR (1, 5) gen1
+    putStrLn $ "Der Gegner zeigt: " ++ (show shown)
+
+    let (guessed, gen3) = randomR (1, 5) gen2
+    putStrLn $ "Der Gegner hat " ++ (show guessed) ++ " geraten."
+
+    setStdGen gen3
+    return (shown, guessed)
+
+
+score :: IO (Integer, Integer) -> Score
+score partnerTurn = StateT $ \(s1, s2) -> do
+    you <- yourTurn
+    partner <- partnerTurn
+    let sum = (fst you) + (snd partner)
+
+    let yourScore = if (snd you) == sum then 1 else 0
+    let partnerScore = if (snd partner) == sum then 1 else 0
+    return ((yourScore, partnerScore), (s1 + yourScore, s2 + partnerScore))
+
+
+loopGame :: IO (Integer, Integer)
+         -> (Integer, Integer)
+         -> IO (Either (Integer, Integer) (Integer, Integer))
+loopGame partnerTurn currentScore = do
+    (result, s) <- runStateT (score partnerTurn) currentScore
+    putStrLn $ show $ result
+
+    case s of
+      (16, _) -> return $ Left result
+      (_, 16) -> return $ Right result
+      _       -> loopGame partnerTurn s
+
+
+main :: IO ()
+main = do
+    winner <- loopGame aiTurn (0, 0)
+
+    case winner of
+      Left x ->  putStrLn $ "You've won! Score: " ++ (show x)
+      Right x -> putStrLn $ "You've lost! Score: " ++ (show x)
+
+    return ()

Haskell-book/26/Morra/package.yaml

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+name:                Morra
+version:             0.1.0.0
+license:             BSD3
+author:              "Eugen Wissner"
+maintainer:          "belka@caraus.de"
+copyright:           "2018 Eugen Wissner"
+
+dependencies:
+- base >= 4.7 && < 5
+- random
+- transformers
+- ansi-terminal
+
+executables:
+  morra:
+    main:                Main.hs
+    source-dirs:         app
+    ghc-options:
+    - -threaded
+    - -rtsopts
+    - -with-rtsopts=-N

Haskell-book/26/Morra/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
+# resolver: ghcjs-0.1.0_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-11.9
+
+# 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
+# - location:
+#    git: https://github.com/commercialhaskell/stack.git
+#    commit: e7b331f14bcffb8367cd58fbfc8b40ec7642100a
+# - location: https://github.com/commercialhaskell/stack/commit/e7b331f14bcffb8367cd58fbfc8b40ec7642100a
+#  subdirs:
+#  - auto-update
+#  - wai
+packages:
+- .
+# Dependency packages to be pulled from upstream that are not in the resolver
+# using the same syntax as the packages field.
+# (e.g., acme-missiles-0.3)
+# 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: ">=1.7"
+#
+# 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