init

.gitignore

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+*.hi
+*.o
+*.local
+.hsenv*
+.git
+.cabal-sandbox/
+.ghc.*
+cabal.sandbox.config
+dist/
+dist-newstyle/
+*.prof
+*.aux
+*.hp
+*.ps
+*.pdf
+*.html
+*.swp
+*.eventlog
+*.*~
+.*autosave.kra
+.envrc

CHANGELOG.md

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+# Revision history for canvas
+
+## 0.0.0.0 -- 2020-02-01
+
+* First version. Released on an unsuspecting world.

LICENSE

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+Copyright (c) 2020, nek0
+
+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 nek0 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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+# canvas
+
+A test implementation for drawing images with SDL2 and OpenGL

Setup.hs

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+import Distribution.Simple
+main = defaultMain

app/Main.hs

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+module Main where
+
+main :: IO ()
+main = putStrLn "Hello, Haskell!"

canvas.cabal

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+cabal-version:       2.4
+-- Initial package description 'canvas.cabal' generated by 'cabal init'.
+-- For further documentation, see http://haskell.org/cabal/users-guide/
+
+name:                canvas
+version:             0.0.0.0
+synopsis:            A test implementation for drawing images with SDL2 and OpenGL
+-- description:
+-- bug-reports:
+license:             BSD-3-Clause
+license-file:        LICENSE
+author:              nek0
+maintainer:          nek0@nek0.eu
+-- copyright:
+category:            Game
+extra-source-files:  CHANGELOG.md
+
+executable canvas
+  main-is:             Main.hs
+  -- other-modules:
+  -- other-extensions:
+  build-depends:       base ^>=4.12.0.0
+  hs-source-dirs:      app
+  default-language:    Haskell2010

default.nix

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+{ pkgs ? import <nixpkgs> (import (builtins.fetchTarball https://github.com/input-output-hk/haskell.nix/archive/master.tar.gz))
+, haskellCompiler ? "ghc865"
+, lib ? pkgs.lib
+, config ? pkgs.config
+}:
+  pkgs.haskell-nix.cabalProject {
+    src = pkgs.haskell-nix.haskellLib.cleanGit { src = ./.; };
+    #src = pkgs.haskell-nix.haskellLib.cleanGit { src = pkgs.nix-gitignore.gitignoreSource [] ./.; };
+    #rc = pkgs.nix-gitignore.gitignoreSource [] ./.;
+    ghc = pkgs.buildPackages.pkgs.haskell-nix.compiler.${haskellCompiler};
+  }

shell.nix

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+let
+  hsPkgs = import ./default.nix {};
+in
+  hsPkgs.canvas.components.all