Merge pull request #1281 from teto/flake-support

build: add flake support

flake.lock

+{
+  "nodes": {
+    "flake-compat": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1627913399,
+        "narHash": "sha256-hY8g6H2KFL8ownSiFeMOjwPC8P0ueXpCVEbxgda3pko=",
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "rev": "12c64ca55c1014cdc1b16ed5a804aa8576601ff2",
+        "type": "github"
+      },
+      "original": {
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "type": "github"
+      }
+    },
+    "flake-compat_2": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1627913399,
+        "narHash": "sha256-hY8g6H2KFL8ownSiFeMOjwPC8P0ueXpCVEbxgda3pko=",
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "rev": "12c64ca55c1014cdc1b16ed5a804aa8576601ff2",
+        "type": "github"
+      },
+      "original": {
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "type": "github"
+      }
+    },
+    "flake-utils": {
+      "locked": {
+        "lastModified": 1631561581,
+        "narHash": "sha256-3VQMV5zvxaVLvqqUrNz3iJelLw30mIVSfZmAaauM3dA=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "7e5bf3925f6fbdfaf50a2a7ca0be2879c4261d19",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "flake-utils_2": {
+      "locked": {
+        "lastModified": 1629481132,
+        "narHash": "sha256-JHgasjPR0/J1J3DRm4KxM4zTyAj4IOJY8vIl75v/kPI=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "997f7efcb746a9c140ce1f13c72263189225f482",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "gitignore": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1611672876,
+        "narHash": "sha256-qHu3uZ/o9jBHiA3MEKHJ06k7w4heOhA+4HCSIvflRxo=",
+        "owner": "hercules-ci",
+        "repo": "gitignore.nix",
+        "rev": "211907489e9f198594c0eb0ca9256a1949c9d412",
+        "type": "github"
+      },
+      "original": {
+        "owner": "hercules-ci",
+        "repo": "gitignore.nix",
+        "type": "github"
+      }
+    },
+    "hls": {
+      "inputs": {
+        "flake-compat": "flake-compat_2",
+        "flake-utils": "flake-utils_2",
+        "gitignore": "gitignore",
+        "nixpkgs": "nixpkgs",
+        "pre-commit-hooks": "pre-commit-hooks"
+      },
+      "locked": {
+        "lastModified": 1633522486,
+        "narHash": "sha256-rKtQFo5IPRatGwDWfC0KGBtzo6PmDo7GEE2MbO0ghJ4=",
+        "owner": "haskell",
+        "repo": "haskell-language-server",
+        "rev": "4ab35bc93ba60e488b0c952e4cdb4068c06596e2",
+        "type": "github"
+      },
+      "original": {
+        "owner": "haskell",
+        "repo": "haskell-language-server",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1630887066,
+        "narHash": "sha256-0ecIlrLsNIIa+zrNmzXXmbMBLZlmHU/aWFsa4bq99Hk=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "5e47a07e9f2d7ed999f2c7943b0896f5f7321ca3",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs_2": {
+      "locked": {
+        "lastModified": 1630761588,
+        "narHash": "sha256-7GXckvZy7DGh2KIyfdArqwnyeSc5Owy1fumEDQyd8eY=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "a51aa6523bd8ee985bc70987909eff235900197a",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "a51aa6523bd8ee985bc70987909eff235900197a",
+        "type": "github"
+      }
+    },
+    "pre-commit-hooks": {
+      "inputs": {
+        "flake-utils": [
+          "hls",
+          "flake-utils"
+        ],
+        "nixpkgs": [
+          "hls",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1624971177,
+        "narHash": "sha256-Amf/nBj1E77RmbSSmV+hg6YOpR+rddCbbVgo5C7BS0I=",
+        "owner": "cachix",
+        "repo": "pre-commit-hooks.nix",
+        "rev": "397f0713d007250a2c7a745e555fa16c5dc8cadb",
+        "type": "github"
+      },
+      "original": {
+        "owner": "cachix",
+        "repo": "pre-commit-hooks.nix",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-compat": "flake-compat",
+        "flake-utils": "flake-utils",
+        "hls": "hls",
+        "nixpkgs": "nixpkgs_2"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

+{
+  description = "A Haskell kernel for IPython.";
+
+  inputs = {
+
+    nixpkgs.url = "github:NixOS/nixpkgs?rev=a51aa6523bd8ee985bc70987909eff235900197a";
+    flake-utils.url = "github:numtide/flake-utils";
+    hls.url = "github:haskell/haskell-language-server";
+
+    flake-compat = {
+      url = "github:edolstra/flake-compat";
+      flake = false;
+    };
+  };
+
+  outputs = inputs@{ self, hls, nixpkgs, flake-utils, ... }:
+    flake-utils.lib.eachSystem ["x86_64-linux"] (system: let
+      pkgs = import nixpkgs {
+        inherit system;
+      };
+      compilerVersion = "8107";
+
+      ihaskellEnv = import ./release.nix {
+        compiler = "ghc${compilerVersion}";
+        nixpkgs = pkgs;
+        # just for the example
+        packages = p: [ p.Frames ];
+      };
+    in {
+      defaultPackage = ihaskellEnv;
+    });
+}