Simple UI and game loop outline

.travis.yml

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+# From https://docs.haskellstack.org/en/stable/travis_ci/
+sudo: false
+
+language: generic
+
+cache:
+  directories:
+    - $HOME/.stack
+
+addons:
+  apt:
+    packages:
+      - libgmp-dev
+
+before_install:
+  - mkdir -p ~/.local/bin
+  - export PATH=$HOME/.local/bin:$PATH
+  - travis_retry curl -L https://www.stackage.org/stack/linux-x86_64 | tar xz --wildcards --strip-components=1 -C ~/.local/bin '*/stack'
+
+install:
+  - stack --no-terminal --install-ghc test --only-dependencies
+
+script:
+  - stack --no-terminal build --pedantic
+  - stack --no-terminal test --haddock --no-haddock-deps

LICENSE

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+Copyright Daniel Holmes (c) 2017
+
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+
+    * Redistributions in binary form must reproduce the above
+      copyright notice, this list of conditions and the following
+      disclaimer in the documentation and/or other materials provided
+      with the distribution.
+
+    * Neither the name of Daniel Holmes nor the names of other
+      contributors may be used to endorse or promote products derived
+      from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

README.md

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+# Wolfenstein 3D in Haskell
+
+[![Build Status](https://travis-ci.org/danielholmes/wolf3d-haskell.svg?branch=master)](https://travis-ci.org/danielholmes/wolf3d-haskell)
+
+Functional Wolfenstein 3D engine implementation in Haskell.
+
+
+## Requirements
+
+ - (Stack)[https://www.haskellstack.org] (Tested with 1.4)
+ - (SDL2)[https://www.libsdl.org/]
+ - (SDL2 Image)[https://www.libsdl.org/projects/SDL_image/]
+
+
+## Setting up Development Environment
+
+```bash
+stack setup
+stack build --pedantic
+```
+
+
+## Running
+
+```bash
+stack exec wolf3d
+```
+
+
+## Running REPL
+
+```bash
+stack repl
+```
+
+
+## Running Tests
+
+```bash
+stack test --pedantic
+```

Setup.hs

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+import Distribution.Simple
+main = defaultMain

app/Main.hs

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+module Main where
+
+import qualified Lib
+
+main :: IO ()
+main = Lib.main