init dune project

.envrc

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+use flake

.gitignore

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+.direnv
+_build

bin/dune

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+(executable
+ (public_name poplpaper)
+ (name main)
+ (libraries poplpaper))

bin/main.ml

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+let () = print_endline "Hello, World!"

default.nix

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+{ buildDunePackage, nix-gitignore }:
+
+buildDunePackage {
+  pname = "poplpaper";
+  version = "0.0";
+  src = nix-gitignore.gitignoreSource [ ./.gitignore ] ./.;
+}

dune-project

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+(lang dune 2.9)

flake.lock

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+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1710146030,
+        "narHash": "sha256-SZ5L6eA7HJ/nmkzGG7/ISclqe6oZdOZTNoesiInkXPQ=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "b1d9ab70662946ef0850d488da1c9019f3a9752a",
+        "type": "github"
+      },
+      "original": {
+        "id": "flake-utils",
+        "type": "indirect"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1663551060,
+        "narHash": "sha256-e2SR4cVx9p7aW/XnVsGsWZBplApA9ZJUjc0fejJhnYo=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "8a5b9ee7b7a2b38267c9481f5c629c015108ab0d",
+        "type": "github"
+      },
+      "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
+}

flake.nix

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+{
+  outputs = { self, nixpkgs, flake-utils }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = import nixpkgs { inherit system; };
+        flakePkgs = { main = pkgs.ocamlPackages.callPackage ./. { }; };
+      in {
+        devShell = pkgs.mkShell {
+          inputsFrom = with flakePkgs; [ main ];
+          packages = with pkgs; [ ocamlPackages.ocaml-lsp ];
+        };
+      });
+}

lib/dune

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+(library
+ (name poplpaper))

test/dune

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+(test
+ (name poplpaper))