Add nix flake

flake.lock

@@ -0,0 +1,80 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1689068808,
+        "narHash": "sha256-6ixXo3wt24N/melDWjq70UuHQLxGV8jZvooRanIHXw0=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "919d646de7be200f3bf08cb76ae1f09402b6f9b4",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "git-ignore-nix": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1660459072,
+        "narHash": "sha256-8DFJjXG8zqoONA1vXtgeKXy68KdJL5UaXR8NtVMUbx8=",
+        "owner": "hercules-ci",
+        "repo": "gitignore.nix",
+        "rev": "a20de23b925fd8264fd7fad6454652e142fd7f73",
+        "type": "github"
+      },
+      "original": {
+        "owner": "hercules-ci",
+        "ref": "master",
+        "repo": "gitignore.nix",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1691186842,
+        "narHash": "sha256-wxBVCvZUwq+XS4N4t9NqsHV4E64cPVqQ2fdDISpjcw0=",
+        "path": "/nix/store/d42v5grfq77vr10r336kks0qjp0wij8d-source",
+        "rev": "18036c0be90f4e308ae3ebcab0e14aae0336fe42",
+        "type": "path"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "type": "indirect"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "git-ignore-nix": "git-ignore-nix",
+        "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

@@ -0,0 +1,34 @@
+{
+  inputs = {
+    flake-utils.url = github:numtide/flake-utils;
+    git-ignore-nix = {
+      url = github:hercules-ci/gitignore.nix/master;
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+  };
+  outputs = {
+    self, flake-utils, nixpkgs, git-ignore-nix, ...
+  }: flake-utils.lib.eachDefaultSystem (system: let
+    overlay = self: super: {
+      picom = super.picom.overrideAttrs (oldAttrs: rec {
+        pname = "picom";
+        buildInputs = [
+          self.pcre2 self.xorg.xcbutil
+        ] ++ self.lib.remove self.xorg.libXinerama (
+          self.lib.remove self.pcre oldAttrs.buildInputs
+        );
+        src = git-ignore-nix.lib.gitignoreSource ./.;
+      });
+    };
+    pkgs = import nixpkgs { inherit system overlays; config.allowBroken = true; };
+    overlays = [ overlay ];
+  in rec {
+    inherit overlay overlays;
+    defaultPackage = pkgs.picom;
+    devShell = defaultPackage.overrideAttrs {
+      buildInputs = defaultPackage.buildInputs ++ [
+        pkgs.clang-tools
+      ];
+    };
+  });
+}