Merge pull request yaocccc#1 from Ruixi-rebirth/master

add nix flake support

Author: yaocccc

README.md

@@ -100,7 +100,38 @@ $ ninja -C build
 $ ninja -C build install
 ```
 
+
 Default install prefix is `/usr/local`, you can change it with `meson configure -Dprefix=<path> build`
+### Nix Flake
+Here's an example of using it in a nixos configuration 
+```Nix
+{
+  description = "My configuration";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    picom.url = "github:yaocccc/picom";
+  };
+
+  outputs = { nixpkgs, picom, ... }:
+    {
+      nixosConfigurations = {
+        hostname = nixpkgs.lib.nixosSystem
+          {
+            system = "x86_64-linux";
+            modules = [
+              {
+                nixpkgs.overlays = [ picom.overlays.default ];
+                environment.systemPackages = with pkgs;[
+                  picom
+                ];
+              }
+            ];
+          };
+      };
+    };
+}
+```
 
 ## How to Contribute
 

flake.lock

@@ -0,0 +1,39 @@
+{
+  inputs = {
+    nixpkgs.url = "nixpkgs/nixos-unstable";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs =
+    { self
+    , nixpkgs
+    , flake-utils
+    ,
+    }:
+    let
+      overlay =
+        final: prev: {
+          picom = prev.picom.overrideAttrs (oldAttrs: rec {
+            version = "master";
+            src = ./.;
+          });
+        };
+    in
+    flake-utils.lib.eachDefaultSystem
+      (
+        system:
+        let
+          pkgs = import nixpkgs {
+            inherit system;
+            overlays = [
+              self.overlays.default
+            ];
+          };
+        in
+        rec {
+          packages.picom = pkgs.picom;
+          packages.default = pkgs.picom;
+        }
+      )
+    // { overlays.default = overlay; };
+}