[DEVOPS-936] Hydra CI job for stylish-haskell

.buildkite/pipeline.yml

@@ -4,11 +4,6 @@ steps:
     agents:
       system: x86_64-linux
 
-  - label: 'stylish-haskell'
-    command: 'scripts/ci/nix-shell.sh --run scripts/check-stylish.sh'
-    agents:
-      system: x86_64-linux
-
   - label: 'stack2nix'
     command: 'scripts/ci/nix-shell.sh -p cabal2nix stack cabal-install ghc moreutils expect -Q -j 4 --run scripts/check-stack2nix.sh'
     agents:

default.nix

@@ -151,12 +151,17 @@ let
     in
       args: pkgs.callPackage ./scripts/launch/connect-to-cluster (args // { inherit gitrev; } // walletConfig );
   other = rec {
+    walletIntegrationTests = pkgs.callPackage ./scripts/test/wallet/integration { inherit gitrev; };
     validateJson = pkgs.callPackage ./tools/src/validate-json {};
     demoCluster = pkgs.callPackage ./scripts/launch/demo-cluster { inherit gitrev; };
-    shellcheckTests = pkgs.callPackage ./scripts/test/shellcheck.nix { src = ./.; };
-    swaggerSchemaValidation = pkgs.callPackage ./scripts/test/wallet/swaggerSchemaValidation.nix { inherit gitrev; };
-    walletIntegrationTests = pkgs.callPackage ./scripts/test/wallet/integration { inherit gitrev; };
-    buildWalletIntegrationTests = pkgs.callPackage ./scripts/test/wallet/integration/build-test.nix { inherit walletIntegrationTests pkgs; };
+    tests = {
+      shellcheck = pkgs.callPackage ./scripts/test/shellcheck.nix { src = ./.; };
+      hlint = pkgs.callPackage ./scripts/test/hlint.nix { src = ./.; };
+      stylishHaskell = pkgs.callPackage ./scripts/test/stylish.nix { src = ./.; stylish-haskell = cardanoPkgs.stylish-haskell; };
+      buildWalletIntegration = pkgs.callPackage ./scripts/test/wallet/integration/build-test.nix { inherit walletIntegrationTests pkgs; };
+      swaggerSchemaValidation = pkgs.callPackage ./scripts/test/wallet/swaggerSchemaValidation.nix { inherit gitrev; };
+    };
+    fixStylishHaskell = pkgs.callPackage ./scripts/haskell/stylish.nix { stylish-haskell = cardanoPkgs.stylish-haskell; };
     cardano-sl-explorer-frontend = (import ./explorer/frontend {
       inherit system config gitrev pkgs;
       cardano-sl-explorer = cardanoPkgs.cardano-sl-explorer-static;

release.nix

@@ -60,9 +60,7 @@ let
     inherit (mapped'.connectScripts."${cluster}") wallet explorer;
   };
   nixosTests = import ./nixos-tests;
-  shellcheckTests = iohkPkgs.shellcheckTests;
-  swaggerSchemaValidation = iohkPkgs.swaggerSchemaValidation;
-  walletIntegrationTests = iohkPkgs.buildWalletIntegrationTests;
+  tests = iohkPkgs.tests;
   makeRelease = cluster: {
     name = cluster;
     value = {
@@ -71,7 +69,7 @@ let
     };
   };
 in mapped // {
-  inherit walletIntegrationTests swaggerSchemaValidation shellcheckTests;
+  inherit tests;
   nixpkgs = let
     wrapped = pkgs.runCommand "nixpkgs" {} ''
       ln -sv ${fixedNixpkgs} $out

scripts/test/hlint.nix

@@ -0,0 +1,36 @@
+{ runCommand, hlint, src, lib }:
+
+let
+  cleanSourceFilter = with lib;
+    name: type: let baseName = baseNameOf (toString name); in (
+      (type == "regular" && hasSuffix ".hs" baseName) ||
+      (type == "regular" && hasSuffix ".yaml" baseName) ||
+      (type == "directory")
+    );
+  src' = builtins.filterSource cleanSourceFilter src;
+in
+runCommand "cardano-hlint-check" { buildInputs = [ hlint ]; } ''
+  set +e
+  # Networking is not in here, because it has a very different codestyle (doesn't use universum).
+  # This is bad and should probably be fixed.
+  projects=("util" "binary" "crypto" "core" "db" "lrc" "infra" "ssc" "txp" "update" "delegation" "node" "tools" "client" "generator" "auxx" "explorer" "wallet" "wallet-new")
+  cd ${src'}
+  hlint lib/src lib/test lib/bench "''${projects[@]}"
+  EXIT_CODE=$?
+  if [[ $EXIT_CODE != 0 ]]
+  then
+    echo '====================================================================='
+    echo 'Note: to ignore a particular hint (e.g. "Reduce duplication"), write'
+    echo 'this in the source file:'
+    tput bold
+    echo '{-# ANN module ("HLint: ignore Reduce duplication" :: Text) #-}'
+    tput sgr0
+    echo 'You can also apply it just to a particular function, which is better:'
+    tput bold
+    echo '{-# ANN funcName ("HLint: ignore Reduce duplication" :: Text) #-}'
+    tput sgr0
+    exit $EXIT_CODE
+  else
+    echo $EXIT_CODE > $out
+  fi
+''

scripts/test/stylish.nix

@@ -0,0 +1,34 @@
+{ runCommand, stylish-haskell, src, lib, git }:
+
+let
+  cleanSourceFilter = with lib;
+    name: type: let baseName = baseNameOf (toString name); in (
+      (type == "regular" && hasSuffix ".hs" baseName) ||
+      (type == "regular" && hasSuffix ".yaml" baseName) ||
+      (type == "directory")
+    );
+  src' = builtins.filterSource cleanSourceFilter src;
+in
+runCommand "cardano-stylish-check" { succeedOnFailure = true; buildInputs = [ stylish-haskell git ]; } ''
+  set +e
+  cp -a ${src'} tmp-cardano
+  chmod -R 0755 tmp-cardano
+  cd tmp-cardano
+  git init
+  git add -A
+  find . -type f -name "*hs" -not -path '.git' -not -path '*.stack-work*' -not -name 'HLint.hs' -exec stylish-haskell -i {} \;
+  git diff --exit-code
+  EXIT_CODE=$?
+  if [[ $EXIT_CODE != 0 ]]
+  then
+    mkdir -p $out/nix-support
+    git diff > $out/stylish.diff
+    echo "file none $out/stylish.diff" > $out/nix-support/hydra-build-products
+    echo "*** Stylish-haskell found changes that need addressed first"
+    echo "*** Please run \`nix-shell -A fixStylishHaskell\` and commit changes"
+    echo "*** or apply the diff generated by hydra if you don't have nix."
+    exit $EXIT_CODE
+  else
+    echo $EXIT_CODE > $out
+  fi
+''

shell.nix

@@ -16,8 +16,8 @@ in
 with pkgs;
 let
   hsPkgs = haskell.packages.ghc822;
-in
-  haskell.lib.buildStackProject {
+  iohkPkgs = import ./. {inherit config system pkgs; };
+  cardanoSL = haskell.lib.buildStackProject {
      name = "cardano-sl";
      ghc = hsPkgs.ghc;
      buildInputs = [
@@ -29,4 +29,25 @@ in
      # See https://github.com/NixOS/nixpkgs/issues/21200
      ] ++ (lib.optionals stdenv.isLinux [ cabal-install stack ])
        ++ (lib.optionals stdenv.isDarwin (with darwin.apple_sdk.frameworks; [ Cocoa CoreServices libcxx libiconv ]));
-  }
+  };
+  fixStylishHaskell = stdenv.mkDerivation {
+    name = "fix-stylish-haskell";
+    buildInputs = [ iohkPkgs.stylish-haskell git ];
+    shellHook = ''
+      git diff > pre-stylish.diff
+      find . -type f -name "*hs" -not -path '.git' -not -path '*.stack-work*' -not -name 'HLint.hs' -exec stylish-haskell -i {} \;
+      git diff > post-stylish.diff
+      diff pre-stylish.diff post-stylish.diff > /dev/null
+      if [ $? != 0 ]
+      then
+        echo "Changes by stylish have been made. Please commit them."
+      else
+        echo "No stylish changes were made."
+      fi
+      rm pre-stylish.diff post-stylish.diff
+      exit
+    '';
+  };
+in cardanoSL // {
+  inherit fixStylishHaskell;
+}