From 526db69d14221bb65ea7b99d07d8a9e4f41261a4 Mon Sep 17 00:00:00 2001
From: Michael Stapelberg <michael@stapelberg.de>
Date: Mon, 29 Sep 2025 17:21:58 +0200
Subject: [PATCH] declare a development shell in flake.nix

This makes it possible to build i3lock (for development)
on any system on which Nix can be installed (= most Linux systems).

For example, I start Emacs using `nix develop --command emacs`
and that Emacs process is in an environment with all i3lock build deps.

See also:
https://michael.stapelberg.ch/posts/2025-07-27-dev-shells-with-nix-4-quick-examples/

This file is provided best-effort, but PRs are welcome.
---
 flake.lock | 27 +++++++++++++++++++++++++++
 flake.nix  | 28 ++++++++++++++++++++++++++++
 2 files changed, 55 insertions(+)
 create mode 100644 flake.lock
 create mode 100644 flake.nix

diff --git a/flake.lock b/flake.lock
new file mode 100644
index 00000000..d898d110
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,27 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1758791193,
+        "narHash": "sha256-F8WmEwFoHsnix7rt290R0rFXNJiMbClMZyIC/e+HYf0=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "25e53aa156d47bad5082ff7618f5feb1f5e02d01",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-25.05",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 00000000..298e425d
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,28 @@
+{
+  description = "development environment for i3lock";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-25.05";
+  };
+
+  outputs = { self, nixpkgs }:
+    let
+      system = "x86_64-linux";
+      pkgs = nixpkgs.legacyPackages.${system};
+    in {
+      devShells.${system}.default = pkgs.mkShell {
+        buildInputs = with pkgs; [
+          cairo
+          libev
+          libxkbcommon
+          pam
+          pkg-config
+          xcbutilxrm
+          xorg.libX11
+          xorg.libxcb
+          xorg.xcbutil
+          xorg.xcbutilimage
+        ];
+      };
+    };
+}