nix(flake): add flake-compat for legacy nix

default.nix

@@ -0,0 +1,12 @@
+(import (
+    let
+      lock = builtins.fromJSON (builtins.readFile ./flake.lock);
+    in
+      fetchTarball {
+        url = "https://github.com/edolstra/flake-compat/archive/${lock.nodes.flake-compat.locked.rev}.tar.gz";
+        sha256 = lock.nodes.flake-compat.locked.narHash;
+      }
+  ) {
+    src = ./.;
+  })
+.defaultNix

flake.lock

@@ -1,5 +1,21 @@
 {
   "nodes": {
+    "flake-compat": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1650374568,
+        "narHash": "sha256-Z+s0J8/r907g149rllvwhb4pKi8Wam5ij0st8PwAh+E=",
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "rev": "b4a34015c698c7793d592d66adbab377907a2be8",
+        "type": "github"
+      },
+      "original": {
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "type": "github"
+      }
+    },
     "home-manager": {
       "inputs": {
         "nixpkgs": [
@@ -59,6 +75,7 @@
     },
     "root": {
       "inputs": {
+        "flake-compat": "flake-compat",
         "home-manager": "home-manager",
         "homeage": "homeage",
         "nixpkgs": "nixpkgs"

flake.nix

@@ -8,6 +8,10 @@
       url = "github:nix-community/home-manager";
       inputs.nixpkgs.follows = "nixpkgs";
     };
+    flake-compat = {
+      url = "github:edolstra/flake-compat";
+      flake = false;
+    };
     homeage = {
       url = "github:jordanisaacs/homeage";
       inputs.nixpkgs.follows = "nixpkgs";

shell.nix

@@ -0,0 +1,12 @@
+(import (
+    let
+      lock = builtins.fromJSON (builtins.readFile ./flake.lock);
+    in
+      fetchTarball {
+        url = "https://github.com/edolstra/flake-compat/archive/${lock.nodes.flake-compat.locked.rev}.tar.gz";
+        sha256 = lock.nodes.flake-compat.locked.narHash;
+      }
+  ) {
+    src = ./.;
+  })
+.shellNix