Cabal init

.envrc

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+use flake

CHANGELOG.md

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+# Revision history for Estinen
+
+## 0.1.0.0 -- YYYY-mm-dd
+
+* First version. Released on an unsuspecting world.

Estinien.cabal

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+cabal-version:      3.4
+-- The cabal-version field refers to the version of the .cabal specification,
+-- and can be different from the cabal-install (the tool) version and the
+-- Cabal (the library) version you are using. As such, the Cabal (the library)
+-- version used must be equal or greater than the version stated in this field.
+-- Starting from the specification version 2.2, the cabal-version field must be
+-- the first thing in the cabal file.
+
+-- Initial package description 'Estinien' generated by
+-- 'cabal init'. For further documentation, see:
+--   http://haskell.org/cabal/users-guide/
+--
+-- The name of the package.
+name:               Estinien
+
+-- The package version.
+-- See the Haskell package versioning policy (PVP) for standards
+-- guiding when and how versions should be incremented.
+-- https://pvp.haskell.org
+-- PVP summary:     +-+------- breaking API changes
+--                  | | +----- non-breaking API additions
+--                  | | | +--- code changes with no API change
+version:            0.1.0.0
+
+-- A short (one-line) description of the package.
+-- synopsis:
+
+-- A longer description of the package.
+-- description:
+
+-- The license under which the package is released.
+license:            AGPL-3.0-or-later
+
+-- The file containing the license text.
+license-file:       LICENSE
+
+-- The package author(s).
+author:             pingu
+
+-- An email address to which users can send suggestions, bug reports, and patches.
+maintainer:         nor@acorneroftheweb.com
+
+-- A copyright notice.
+-- copyright:
+build-type:         Simple
+
+-- Extra doc files to be distributed with the package, such as a CHANGELOG or a README.
+extra-doc-files:    CHANGELOG.md
+
+-- Extra source files to be distributed with the package, such as examples, or a tutorial module.
+-- extra-source-files:
+
+common warnings
+    ghc-options: -Wall
+
+library
+    -- Import common warning flags.
+    import:           warnings
+
+    -- Modules exported by the library.
+    exposed-modules:  Sudoku
+
+    -- Modules included in this library but not exported.
+    -- other-modules:
+
+    -- LANGUAGE extensions used by modules in this package.
+    -- other-extensions:
+
+    -- Other library packages from which modules are imported.
+    build-depends:    base >=4.19.2.0
+
+    -- Directories containing source files.
+    hs-source-dirs:   src
+
+    -- Base language which the package is written in.
+    default-language: GHC2024
+
+executable Estinien
+    -- Import common warning flags.
+    import:           warnings
+
+    -- .hs or .lhs file containing the Main module.
+    main-is:          Main.hs
+
+    -- Modules included in this executable, other than Main.
+    -- other-modules:
+
+    -- LANGUAGE extensions used by modules in this package.
+    -- other-extensions:
+
+    -- Other library packages from which modules are imported.
+    build-depends:
+        base >=4.19.2.0,
+        Estinien
+
+    -- Directories containing source files.
+    hs-source-dirs:   app
+
+    -- Base language which the package is written in.
+    default-language: GHC2024

LICENSE

@@ -219,7 +219,7 @@ If you develop a new program, and you want it to be of the greatest possible use
 
 To do so, attach the following notices to the program.  It is safest to attach them to the start of each source file to most effectively state the exclusion of warranty; and each file should have at least the "copyright" line and a pointer to where the full notice is found.
 
-     Estinen
+     Estinien
      Copyright (C) 2025  pingu
 
      This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

app/Main.hs

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+module Main where
+
+main :: IO ()
+main = do
+  putStrLn "Hello, Haskell!"

flake.lock

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+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1731533236,
+        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1759831965,
+        "narHash": "sha256-vgPm2xjOmKdZ0xKA6yLXPJpjOtQPHfaZDRtH+47XEBo=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "c9b6fb798541223bbb396d287d16f43520250518",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

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+{
+  description = "Estinien goes flakes";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  nixConfig.allow-import-from-derivation = true; # cabal2nix uses IFD
+
+  outputs = { self, nixpkgs, flake-utils }:
+    let
+      ghcVer = "ghc910";
+      makeHaskellOverlay = overlay: final: prev: {
+        haskell = prev.haskell // {
+          packages = prev.haskell.packages // {
+            ${ghcVer} = prev.haskell.packages."${ghcVer}".override (oldArgs: {
+              overrides =
+                prev.lib.composeExtensions (oldArgs.overrides or (_: _: { }))
+                  (overlay prev);
+            });
+          };
+        };
+      };
+
+      out = system:
+        let
+          pkgs = import nixpkgs {
+            inherit system;
+            overlays = [ self.overlays.default ];
+            config.allowBroken = true;
+          };
+
+        in
+        {
+          packages = rec {
+            default = estinien;
+            estinien = pkgs.haskell.packages.${ghcVer}.estinien;
+          };
+
+          checks = {
+            inherit (self.packages.${system}) estinien;
+          };
+
+          # for debugging
+          # inherit pkgs;
+
+          devShells.default =
+            let haskellPackages = pkgs.haskell.packages.${ghcVer};
+            in
+            haskellPackages.shellFor {
+              packages = p: [ self.packages.${system}.estinien ];
+              withHoogle = true;
+              buildInputs =
+                (with pkgs; [
+                  zlib
+                ]) ++
+                (with haskellPackages; [
+                  haskell-language-server
+                  cabal-install
+                ]);
+              # Change the prompt to show that you are in a devShell
+              # shellHook = "export PS1='\\e[1;34mdev > \\e[0m'";
+            };
+        };
+    in
+    flake-utils.lib.eachDefaultSystem out // {
+      # this stuff is *not* per-system
+      overlays = {
+        default = makeHaskellOverlay (prev: hfinal: hprev:
+          let hlib = prev.haskell.lib; in
+          {
+            estinien = hprev.callCabal2nix "estinien" ./. { };
+
+            rando = hlib.dontCheck hprev.rando;
+          });
+      };
+    };
+}

src/Sudoku.hs

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+module Sudoku where