Hello, World!

.envrc

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+use flake

.gitignore

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+build/
+.cache
+.direnv
+pico_sdk_import.cmake

flake.lock

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+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1771369470,
+        "narHash": "sha256-0NBlEBKkN3lufyvFegY4TYv5mCNHbi5OmBDrzihbBMQ=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "0182a361324364ae3f436a63005877674cf45efb",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs",
+        "systems": "systems"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "id": "systems",
+        "type": "indirect"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

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+{
+  inputs.nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+
+  outputs =
+    inputs @ { nixpkgs
+    , systems
+    , ...
+    }:
+    let
+      inherit (nixpkgs) lib;
+      eachSystem = lib.genAttrs (import systems);
+      pkgsFor = eachSystem (system:
+        import nixpkgs {
+          localSystem = system;
+        });
+    in
+    {
+      devShells =
+        eachSystem
+          (system: {
+            default =
+              let
+                pkgs = pkgsFor.${system};
+                pico-sdk = pkgs.pico-sdk.override {
+                  withSubmodules = true;
+                };
+                PICO_SDK_PATH = "${pico-sdk}/lib/pico-sdk";
+              in
+              pkgs.mkShell {
+                name = "PicoVGA dev shell";
+                inputsFrom = [ pico-sdk ];
+                packages = with pkgs;
+                  [
+                  ]
+                  ++ [ pico-sdk ];
+
+                shellHook = ''
+                  ln -sf ${PICO_SDK_PATH}/external/pico_sdk_import.cmake pico_sdk_import.cmake
+                '';
+
+                inherit PICO_SDK_PATH;
+              };
+          });
+    };
+}