added haskell template

haskell/.envrc

@@ -0,0 +1 @@
+use flake

haskell/flake.lock

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+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1694529238,
+        "narHash": "sha256-zsNZZGTGnMOf9YpHKJqMSsa0dXbfmxeoJ7xHlrt+xmY=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "ff7b65b44d01cf9ba6a71320833626af21126384",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1693428224,
+        "narHash": "sha256-FWUUlhYqkGEySUD0blTADRiDQ7fw+H1ikivfu88uy+w=",
+        "path": "/nix/store/3fdrwsy2yi8rwxqylpd6vi2asraxq1nv-source",
+        "rev": "841889913dfd06a70ffb39f603e29e46f45f0c1a",
+        "type": "path"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "type": "indirect"
+      }
+    },
+    "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
+}

haskell/flake.nix

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+{
+  description = "A bare minimum Haskell flake";
+
+  inputs = {
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, flake-utils }:
+    flake-utils.lib.eachDefaultSystem (sys:
+      let pkgs = import nixpkgs { system = sys; };
+          hpkgs = pkgs.haskellPackages; # pkgs.haskell.ghc<VERSION>
+          project = hpkgs.callCabal2nix "my-cool-project" ./. {};
+      in {
+        packages.default = project;
+        devShells.default = pkgs.mkShell {
+          inputsFrom = [ project.env ];
+        };
+      }
+    );
+}

haskell/my-cool-project.cabal

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+cabal-version:      2.0
+-- 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 'my-cool-project' generated by
+-- 'cabal init'. For further documentation, see:
+--   http://haskell.org/cabal/users-guide/
+--
+-- The name of the package.
+name:               my-cool-project
+
+-- 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:           my cool project
+
+-- A longer description of the package.
+-- description:
+
+-- URL for the project homepage or repository.
+homepage:           mycool.website
+
+-- The license under which the package is released.
+license:            OtherLicense
+
+-- The file containing the license text.
+-- license-file:       LICENSE
+
+-- The package author(s).
+author:             my cool author
+
+-- An email address to which users can send suggestions, bug reports, and patches.
+maintainer:         mycool@email
+
+-- A copyright notice.
+-- copyright:
+category:           my cool category
+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:
+
+executable my-cool-project
+    -- .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 ^>=4.16.4.0
+                    , haskell-say
+
+    -- Directories containing source files.
+    hs-source-dirs:   src
+
+    -- Base language which the package is written in.
+    default-language: Haskell2010

haskell/src/Main.hs

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+module Main where
+
+import HaskellSay
+
+main :: IO ()
+main = haskellSay "λλλλ mjau"