From af52a64341df30c9acb5a8ec95448b97c199bf4a Mon Sep 17 00:00:00 2001
From: Luc Perkins <lucperkins@gmail.com>
Date: Sat, 13 Aug 2022 18:10:46 +0300
Subject: [PATCH] Add OCaml env

---
 README.md        | 12 ++++++++++
 ocaml/.envrc     |  1 +
 ocaml/flake.lock | 60 ++++++++++++++++++++++++++++++++++++++++++++++++
 ocaml/flake.nix  | 26 +++++++++++++++++++++
 4 files changed, 99 insertions(+)
 create mode 100644 ocaml/.envrc
 create mode 100644 ocaml/flake.lock
 create mode 100644 ocaml/flake.nix

diff --git a/README.md b/README.md
index 7fb0e2f..3b39fec 100644
--- a/README.md
+++ b/README.md
@@ -44,6 +44,7 @@ Once your preferred template has been initialized, you can use the provided shel
 | [Nim]                    | [`nim`](./nim/)           |
 | [Nix]                    | [`nix`](./nix/)           |
 | [Node.js][node]          | [`node`](./node/)         |
+| [OCaml]                  | [`ocaml`](./ocaml/)       |
 | [Open Policy Agent][opa] | [`opa`](./opa)            |
 | [Protobuf]               | [`protobuf`](./protobuf/) |
 | [Ruby]                   | [`ruby`](./ruby/)         |
@@ -162,6 +163,13 @@ The sections below list what each template includes. In all cases, you're free t
 - [Yarn] 1.22.19
 - [node2nix] 1.11.1
 
+### [`ocaml`](./ocaml/)
+
+- [OCaml] 4.13.1
+- [Dune] 3.4.1
+- [odoc] 2.1.1
+- [ocamlformat] 0.24.0
+
 ### [`opa`](./opa/)
 
 - [Open Policy Agent][opa] 0.43.0
@@ -236,6 +244,7 @@ All of the templates have only the root [flake](./flake.nix) as a flake input. T
 [dhall-to-nix]: https://github.com/dhall-lang/dhall-haskell/tree/master/dhall-nix
 [dhall-toml]: https://github.com/dhall-lang/dhall-haskell/tree/master/dhall-toml
 [dhall-yaml]: https://github.com/dhall-lang/dhall-haskell/tree/master/dhall-yaml
+[dune]: https://dune.build
 [elixir]: https://elixir-lang.org
 [elm]: https://elm-lang.org
 [elm2nix]: https://github.com/cachix/elm2nix
@@ -273,6 +282,9 @@ All of the templates have only the root [flake](./flake.nix) as a flake input. T
 [nomad-autoscaler]: TOhttps://github.com/hashicorp/nomad-autoscaler
 [nomad-pack]: https://github.com/hashicorp/nomad-pack
 [npm]: https://npmjs.org
+[ocaml]: https://ocaml.org
+[ocamlformat]: https://github.com/ocaml-ppx/ocamlformat
+[odoc]: https://github.com/ocaml/odoc
 [opa]: https://openpolicyagent.org
 [packer]: https://packer.io
 [pip]: https://pypi.org/project/pip
diff --git a/ocaml/.envrc b/ocaml/.envrc
new file mode 100644
index 0000000..a5dbbcb
--- /dev/null
+++ b/ocaml/.envrc
@@ -0,0 +1 @@
+use flake .
diff --git a/ocaml/flake.lock b/ocaml/flake.lock
new file mode 100644
index 0000000..3d3c452
--- /dev/null
+++ b/ocaml/flake.lock
@@ -0,0 +1,60 @@
+{
+  "nodes": {
+    "dev": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      },
+      "locked": {
+        "lastModified": 1660137916,
+        "narHash": "sha256-7+DP5n6r2qULQzxd8dI6ghjMDG47Mpdw1lPYaoB/LYA=",
+        "owner": "the-nix-way",
+        "repo": "dev-templates",
+        "rev": "ada54b20ccc42e53edd8a6a3cc2b56a6a4006d07",
+        "type": "github"
+      },
+      "original": {
+        "owner": "the-nix-way",
+        "repo": "dev-templates",
+        "type": "github"
+      }
+    },
+    "flake-utils": {
+      "locked": {
+        "lastModified": 1659877975,
+        "narHash": "sha256-zllb8aq3YO3h8B/U0/J1WBgAL8EX5yWf5pMj3G0NAmc=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "c0e246b9b83f637f4681389ecabcb2681b4f3af0",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1660137298,
+        "narHash": "sha256-CjWK2qop+j0e/8gRqtSpIizX2EM5YbtR36Db5dhFs94=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "f2f95b120bda675c3eba6d6bf01360c5b9a78e9c",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "dev": "dev"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/ocaml/flake.nix b/ocaml/flake.nix
new file mode 100644
index 0000000..7f79d05
--- /dev/null
+++ b/ocaml/flake.nix
@@ -0,0 +1,26 @@
+{
+  description = "A Nix-flake-based OCaml development environment";
+
+  inputs = { dev.url = "github:the-nix-way/dev-templates"; };
+
+  outputs = { self, dev }:
+    let inherit (dev.lib) flake-utils nixpkgs;
+    in flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = import nixpkgs { inherit system; };
+        inherit (pkgs) mkShell;
+        ocaml = pkgs.ocamlPackages.ocaml;
+        ocamlTools = with pkgs.ocamlPackages;
+          [ dune_3 odoc ] ++ (with pkgs; [ ocamlformat ]);
+      in {
+        devShells = {
+          default = mkShell {
+            buildInputs = [ ocaml ] ++ ocamlTools;
+
+            shellHook = ''
+              ${ocaml}/bin/ocaml --version
+            '';
+          };
+        };
+      });
+}