Add CI checks for Haskell code

.buildkite/pipeline.yml

@@ -1,4 +1,16 @@
 steps:
  - label: check trailing whitespace
  commands:
- - .buildkite/check-trailing-whitespace.sh
+ - .buildkite/check-trailing-whitespace.sh
+ - label: backend server
+ commands:
+ - nix-build -A packages.x86_64-linux.backend-server
+ - label: backend lib
+ commands:
+ - nix-build -A packages.x86_64-linux.backend-lib
+ - label: backend test
+ commands:
+ - nix-build -A checks.x86_64-linux.backend-test
+ - label: backend hlint
+ commands:
+ - nix-shell --run 'hlint backend -j'

backend/default.nix

@@ -0,0 +1,15 @@
+{ haskell-nix }:
+let
+ project = haskell-nix.stackProject {
+ src = haskell-nix.haskellLib.cleanGit {
+ src = haskell-nix.cleanSourceHaskell { src = ./.; };
+ };
+ };
+
+ library = project.edna.components.library;
+ server = project.edna.components.exes.edna-server;
+ test = project.edna.checks.edna-test;
+
+in {
+ inherit server library test;
+}

default.nix

@@ -0,0 +1,4 @@
+(import (fetchTarball
+ "https://github.com/edolstra/flake-compat/archive/master.tar.gz") {
+ src = builtins.fetchGit ./.;
+ }).defaultNix

flake.nix

@@ -0,0 +1,37 @@
+{
+ inputs = {
+ nixpkgs.url = "github:serokell/nixpkgs";
+ haskell-nix.url = "github:input-output-hk/haskell.nix";
+ flake-utils.url = "github:numtide/flake-utils";
+
+ hackage = {
+ url = "github:input-output-hk/hackage.nix";
+ flake = false;
+ };
+
+ stackage = {
+ url = "github:input-output-hk/stackage.nix";
+ flake = false;
+ };
+ };
+
+ outputs = { self, nixpkgs, haskell-nix, hackage, stackage, flake-utils }:
+ flake-utils.lib.eachSystem [ "x86_64-linux" ] (system:
+ let
+ pkgs = nixpkgs.legacyPackages.${system}.extend haskell-nix.overlay;
+ backend = pkgs.callPackage ./backend { };
+ in {
+ defaultPackage = self.packages.${system}.backend-server;
+ packages = {
+ backend-lib = backend.library;
+ backend-server = backend.server;
+ };
+
+ checks.backend-test = backend.test;
+
+ devShell = pkgs.mkShell {
+ inputsFrom = [ self.packages.${system}.backend-lib ];
+ buildInputs = with pkgs.haskellPackages; [ cabal-install hpack hlint ];
+ };
+ });
+}

shell.nix

@@ -0,0 +1,4 @@
+(import (fetchTarball
+ "https://github.com/edolstra/flake-compat/archive/master.tar.gz") {
+ src = builtins.fetchGit ./.;
+ }).shellNix