From 4d696f5ad4293ef2cd3bde406b12ea319bc0d249 Mon Sep 17 00:00:00 2001
From: Nikos Baxevanis <nikos.baxevanis@gmail.com>
Date: Thu, 29 Jan 2015 16:18:49 +0200
Subject: [PATCH] Added HLint to the pipeline of test suites.

Notice the --reorder-goals switch in cabal install. More information about
it can be found at: https://github.com/haskell/cabal/issues/1780/.
---
 HLint.hs                 |  7 +++++++
 README                   |  5 ++++-
 quickcheck-samples.cabal |  9 +++++++++
 tests/HLint.hs           | 16 ++++++++++++++++
 4 files changed, 36 insertions(+), 1 deletion(-)
 create mode 100644 HLint.hs
 create mode 100644 tests/HLint.hs

diff --git a/HLint.hs b/HLint.hs
new file mode 100644
index 0000000..99ee203
--- /dev/null
+++ b/HLint.hs
@@ -0,0 +1,7 @@
+{-# LANGUAGE PackageImports #-}
+
+module HLint () where
+
+import "hint" HLint.Default
+import "hint" HLint.Dollar
+import "hint" HLint.Generalise
diff --git a/README b/README
index 1886824..9ab76bf 100644
--- a/README
+++ b/README
@@ -4,7 +4,10 @@ cabal update                      # Download the most recent list of packages
 cabal install cabal-install       # Optional, can be prompted by cabal update
 
 cabal sandbox init                # Initialise the sandbox
-cabal install --only-dependencies # Install dependencies into the sandbox
+cabal install \                   # Install dependencies into the sandbox
+    --enable-tests \
+    --only-dependencies \
+    --reorder-goals
 cabal build                       # Build your package inside the sandbox
 
 cabal configure --enable-tests    # Enable the test suites
diff --git a/quickcheck-samples.cabal b/quickcheck-samples.cabal
index 6981615..8ad8b92 100644
--- a/quickcheck-samples.cabal
+++ b/quickcheck-samples.cabal
@@ -20,3 +20,12 @@ Test-Suite spec
   Build-Depends:        base
                       , hspec
                       , QuickCheck
+
+Test-Suite style
+  Type:                 exitcode-stdio-1.0
+  Default-Language:     Haskell2010
+  Hs-Source-Dirs:       tests
+  Ghc-Options:          -Wall
+  Main-Is:              HLint.hs
+  Build-Depends:        base
+                      , hlint == 1.*
diff --git a/tests/HLint.hs b/tests/HLint.hs
new file mode 100644
index 0000000..6cf63d0
--- /dev/null
+++ b/tests/HLint.hs
@@ -0,0 +1,16 @@
+module Main (main) where
+
+import Language.Haskell.HLint (hlint)
+import System.Exit            (exitFailure, exitSuccess)
+
+arguments :: [String]
+arguments =
+    [ "tests"
+    ]
+
+main :: IO ()
+main = do
+    hints <- hlint arguments
+    if null hints
+        then exitSuccess
+        else exitFailure