Simplify down to just a cabal package

.travis.yml

@@ -1,3 +1,3 @@
 language: nix
 nix: 2.2.2
-script: nix build -f default.nix kesha
+script: ci.sh

LICENSE

@@ -1,4 +1,4 @@
-Copyright (c) 2019 Jordan Mackie
+Copyright (c) 2020 Jordan Mackie
 
 Permission is hereby granted, free of charge, to any person obtaining
 a copy of this software and associated documentation files (the

README.md

@@ -2,28 +2,7 @@
 
 [![Build Status](https://travis-ci.org/jmackie/kesha.svg?branch=master)](https://travis-ci.org/jmackie/kesha)
 
-A Haskell library and executable for computing the cryptographic hash of any path.
+A Haskell library for computing the cryptographic hash of any path.
 
 The implementation is an almost verbatim port of `nix-hash`, which is the
 standard tool used by the [Nix](https://nixos.org/nix/) package manager.
-
-# Installation
-
-With [`cabal`](https://cabal.readthedocs.io/en/latest/)
-
-```bash
-cabal new-install
-```
-
-with [`stack`](https://docs.haskellstack.org/en/latest/)
-
-```bash
-stack install
-```
-
-with [Nix](https://nixos.org/nix/)
-
-```bash
-nix build -f https://github.com/jmackie/kesha/archive/master.tar.gz kesha -o ./kesha
-nix-env -i ./kesha
-```

Setup.hs

@@ -1,2 +1,3 @@
 import Distribution.Simple
+
 main = defaultMain

ci.sh

@@ -0,0 +1,41 @@
+#!/usr/bin/env nix-shell
+#! nix-shell -i bash
+
+set -euo pipefail
+shopt -s inherit_errexit
+
+print_versions() { (
+  set -x
+  ghc --version
+  cabal --version
+  hlint --version
+  ormolu --version
+); }
+
+build_and_test() {
+  cabal new-update
+  cabal new-build
+  cabal new-test --test-show-details=streaming
+}
+
+lint() {
+  hlint --git
+
+  local exit=0
+  for f in $(git ls-files | grep -e '\.hs'); do
+    if ! ormolu --mode check "$f"; then
+      echo 2>&1 "$f isn't formatted"
+      exit=1
+    fi
+  done
+
+  return $exit
+}
+
+main() {
+  print_versions
+  build_and_test
+  lint
+}
+
+main "$@"

kesha.cabal

@@ -13,7 +13,7 @@ license: MIT
 license-file: LICENSE
 author: Jordan Mackie
 maintainer: [email protected]
-copyright: (c) 2019 Jordan Mackie
+copyright: (c) 2020 Jordan Mackie
 category: System
 extra-source-files:
   README.md
@@ -28,52 +28,43 @@ source-repository head
 library
   default-language: Haskell2010
   hs-source-dirs: src
-  ghc-options: -Wall 
+  ghc-options: -Wall
   exposed-modules:
     Kesha
     Kesha.NAR
   build-depends:
     -- https://wiki.haskell.org/Base_package
+    -- >= 8.2.2 && < 8.9
     base >= 4.10.1 && < 4.14,
 
+    -- boot libraries
     binary,
     bytestring,
     containers,
-    cryptohash-sha256,
+    -- 1.3.1.0 introduced `getSymbolicLinkTarget`
     directory >= 1.3.1,
     filepath,
-    text
+    text,
 
-executable kesha
-  default-language: Haskell2010
-  hs-source-dirs: app
-  ghc-options: -Wall -threaded -O2 -rtsopts -with-rtsopts=-N
-  main-is: Main.hs
-  other-modules: Paths_kesha
-  build-depends:
-    base >= 4.10.1 && < 4.14,
-
-    bytestring,
-
-    kesha
+    cryptohash-sha256
 
 test-suite test
+  default-language: Haskell2010
   type: exitcode-stdio-1.0
   main-is: Main.hs
   hs-source-dirs: test
   ghc-options: -Wall -threaded -rtsopts
   build-depends:
+    kesha,
+
     base >= 4.10.1 && < 4.14,
 
-    QuickCheck,
     bytestring,
     containers,
     directory >= 1.3.1,
     filepath,
-    hspec,
     process,
-    temporary,
 
-    kesha
-  other-modules:
-  default-language: Haskell2010
+    hspec,
+    QuickCheck,
+    temporary

shell.nix

@@ -1 +1,19 @@
-(import ./.).env
+let
+  pinnedPkgs =
+    # 2020-05-17T11:55:13+02:00
+    let rev = "85d6f3bcd9cbcc52c4a307d2ef5116dab4b41641";
+    in import (builtins.fetchTarball {
+      name = "nixpkgs-${rev}";
+      url = "https://github.com/nixos/nixpkgs/archive/${rev}.tar.gz";
+      sha256 = "10jxpwq47clbj047jh5zn20hqmwpc821ac8zljgpayk0sk5p0mwv";
+    }) { };
+in { pkgs ? pinnedPkgs, compiler ? "ghc865" }:
+pkgs.mkShell {
+  buildInputs = [
+    pkgs.haskell.packages."${compiler}".ghc
+    pkgs.cabal-install
+    pkgs.ormolu
+    pkgs.hlint
+  ];
+}
+