From 467f48b3ad64bd13e6ef633132c661865ea82146 Mon Sep 17 00:00:00 2001
From: Samir Talwar <samir.talwar@hasura.io>
Date: Mon, 11 Sep 2023 13:17:32 +0200
Subject: [PATCH] Set up a development shell with Nix.

Just for local development; no one's shipping anything with this thing.
---
 .envrc                     |  3 ++
 .envrc.local               |  5 ++++
 .github/workflows/nix.yaml | 20 +++++++++++++
 .gitignore                 |  4 +++
 flake.lock                 | 61 ++++++++++++++++++++++++++++++++++++++
 flake.nix                  | 39 ++++++++++++++++++++++++
 6 files changed, 132 insertions(+)
 create mode 100644 .envrc
 create mode 100644 .envrc.local
 create mode 100644 .github/workflows/nix.yaml
 create mode 100644 flake.lock
 create mode 100644 flake.nix

diff --git a/.envrc b/.envrc
new file mode 100644
index 000000000..5de4a0859
--- /dev/null
+++ b/.envrc
@@ -0,0 +1,3 @@
+#!/usr/bin/env bash
+
+source_env_if_exists ./.envrc.local
diff --git a/.envrc.local b/.envrc.local
new file mode 100644
index 000000000..3f4114658
--- /dev/null
+++ b/.envrc.local
@@ -0,0 +1,5 @@
+#!/usr/bin/env bash
+
+use flake
+
+source_env ../.envrc
diff --git a/.github/workflows/nix.yaml b/.github/workflows/nix.yaml
new file mode 100644
index 000000000..3fa535ccb
--- /dev/null
+++ b/.github/workflows/nix.yaml
@@ -0,0 +1,20 @@
+name: test Nix support
+
+on: push
+
+jobs:
+  evaluate-nix-shell:
+    name: Evaluate the Nix shell
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout 🛎️
+        uses: actions/checkout@v3
+
+      - name: Install Nix ❄
+        uses: DeterminateSystems/nix-installer-action@v4
+
+      - name: Run the Magic Nix Cache 🔌
+        uses: DeterminateSystems/magic-nix-cache-action@v2
+
+      - name: Evaluate the Nix shell
+        run: nix develop -c "true"
diff --git a/.gitignore b/.gitignore
index ea8c4bf7f..428674eaf 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,5 @@
+# Rust
 /target
+
+# direnv
+/.direnv
diff --git a/flake.lock b/flake.lock
new file mode 100644
index 000000000..e5826ca7e
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,61 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1692799911,
+        "narHash": "sha256-3eihraek4qL744EvQXsK1Ha6C3CR7nnT8X2qWap4RNk=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "f9e7cf818399d17d347f847525c5a5a8032e4e44",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1694430955,
+        "narHash": "sha256-01IHejnGTdivgQoXTh/fS740JsbOTuCtJkgTyQ+Buq8=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "bce7373adb44a76912a03548c4d31bf6f368f21b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "master",
+        "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
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 000000000..fefd4648e
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,39 @@
+{
+  description = "ndc-sdk";
+
+  inputs = {
+    flake-utils.url = github:numtide/flake-utils;
+    nixpkgs.url = github:NixOS/nixpkgs/master;
+  };
+
+  outputs =
+    { self
+    , flake-utils
+    , nixpkgs
+    }:
+    flake-utils.lib.eachDefaultSystem (system:
+    let
+      pkgs = import nixpkgs { inherit system; };
+    in
+    {
+      devShells.default = pkgs.mkShell {
+        nativeBuildInputs = [
+          pkgs.cargo
+          pkgs.cargo-edit
+          pkgs.cargo-machete
+          pkgs.clippy
+          pkgs.rust-analyzer
+          pkgs.rustPlatform.rustcSrc
+          pkgs.rustc
+          pkgs.rustfmt
+        ];
+
+        buildInputs = pkgs.lib.optionals pkgs.stdenv.isDarwin [
+          pkgs.darwin.apple_sdk.frameworks.Security
+          pkgs.libiconv
+        ];
+      };
+
+      formatter = pkgs.nixpkgs-fmt;
+    });
+}