feat: init

templates/haskell/.envrc

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+use flake

templates/haskell/.gitignore

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+.direnv
+.pre-commit-config.yaml
+.vscode
+dist-newstyle

templates/haskell/example.cabal

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+cabal-version: 3.0
+name:          example
+version:       0.1.0.0
+
+executable main
+  main-is:          Main.hs
+  build-depends:
+    , base          
+  default-language: Haskell2010
+  hs-source-dirs:   src

templates/haskell/flake.nix

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+{
+  inputs = {
+    haskell-flake.url = "github:srid/haskell-flake";
+    nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
+    pre-commit-hooks-nix.url = "github:cachix/pre-commit-hooks.nix";
+  };
+  outputs = inputs @ {
+    self,
+    nixpkgs,
+    flake-parts,
+    ...
+  }:
+    flake-parts.lib.mkFlake {inherit inputs;} {
+      imports = [
+        inputs.haskell-flake.flakeModule
+        inputs.pre-commit-hooks-nix.flakeModule
+        ./parts
+      ];
+      systems = nixpkgs.lib.systems.flakeExposed;
+    };
+}

templates/haskell/parts/config/devshells.nix

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+{
+  pkgs,
+  config,
+  ...
+}:
+{
+  haskellProjects.default = {
+    devShell = {
+      enable = true;
+
+      tools = hp: {
+        inherit (hp)
+          cabal-fmt
+          haskell-language-server
+          ;
+
+        inherit (pkgs)
+          dhall
+          dhall-json
+          dhall-lsp-server
+          helix-gpt
+          age
+          just
+          nil
+          nixd
+          sops
+          ssh-to-age
+          nixfmt-rfc-style
+          libz
+          ngrep
+          stripe-cli
+          vscode-langservers-extracted
+          zlib
+          ;
+
+        inherit (pkgs.haskellPackages)
+          nixfmt
+          ;
+      };
+
+      hlsCheck.enable = true;
+      mkShellArgs.shellHook = "${config.pre-commit.installationScript}";
+    };
+  };
+}

templates/haskell/parts/config/packages.nix

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+{self, ...}: {packages.default = self.packages.example;}

templates/haskell/parts/config/pre-commit.nix

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+{
+  pre-commit.settings.hooks = {
+    nixfmt.enable = true;
+    commitizen.enable = true;
+    statix.enable = true;
+  };
+}

templates/haskell/parts/default.nix

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+{
+  perSystem = {
+    pkgs,
+    lib,
+    config,
+    self',
+    ...
+  }: let
+    configPath = ./config;
+
+    devshellImports = let
+      files = builtins.attrNames (builtins.readDir configPath);
+    in
+      map
+      (name: configPath + "/${name}")
+      (builtins.filter (name: builtins.match ".*\\.nix$" name != null) files);
+  in {
+    imports = devshellImports;
+  };
+}

templates/haskell/src/Main.hs

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