diff --git a/.envrc b/.envrc
new file mode 100644
index 0000000..f6c8c24
--- /dev/null
+++ b/.envrc
@@ -0,0 +1,2 @@
+watch_file nix/*.ulu.nix
+use flake
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..5d8cdc9
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,11 @@
+/*
+!/.gitignore
+!/.envrc
+!/flake.nix
+!/flake.lock
+!/Cargo.toml
+!/Cargo.lock
+!/nix/
+!/src/
+!/docs/
+!/README.md
diff --git a/Cargo.lock b/Cargo.lock
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index 0000000..337ab28
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+ "wayland-protocols",
+ "wayland-scanner",
+]
+
+[[package]]
+name = "wayland-protocols-misc"
+version = "0.3.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6e9567599ef23e09b8dad6e429e5738d4509dfc46b3b21f32841a304d16b29c8"
+dependencies = [
+ "bitflags",
+ "wayland-backend",
+ "wayland-client",
+ "wayland-protocols",
+ "wayland-scanner",
+]
+
+[[package]]
+name = "wayland-protocols-wlr"
+version = "0.3.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "eb04e52f7836d7c7976c78ca0250d61e33873c34156a2a1fc9474828ec268234"
+dependencies = [
+ "bitflags",
+ "wayland-backend",
+ "wayland-client",
+ "wayland-protocols",
+ "wayland-scanner",
+]
+
+[[package]]
+name = "wayland-scanner"
+version = "0.31.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "338e30461b3a2b67d70eb30a6d89f8e0c93a833e07d2ae89085cd070c4a00ac0"
+dependencies = [
+ "proc-macro2",
+ "quick-xml",
+ "quote",
+]
+
+[[package]]
+name = "wayland-sys"
+version = "0.31.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d8eab23fefc9e41f8e841df4a9c707e8a8c4ed26e944ef69297184de2785e3be"
+dependencies = [
+ "pkg-config",
+]
+
+[[package]]
+name = "windows-core"
+version = "0.62.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b8e83a14d34d0623b51dce9581199302a221863196a1dde71a7663a4c2be9deb"
+dependencies = [
+ "windows-implement",
+ "windows-interface",
+ "windows-link",
+ "windows-result",
+ "windows-strings",
+]
+
+[[package]]
+name = "windows-implement"
+version = "0.60.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "053e2e040ab57b9dc951b72c264860db7eb3b0200ba345b4e4c3b14f67855ddf"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.119",
+]
+
+[[package]]
+name = "windows-interface"
+version = "0.59.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3f316c4a2570ba26bbec722032c4099d8c8bc095efccdc15688708623367e358"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.119",
+]
+
+[[package]]
+name = "windows-link"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f0805222e57f7521d6a62e36fa9163bc891acd422f971defe97d64e70d0a4fe5"
+
+[[package]]
+name = "windows-result"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7781fa89eaf60850ac3d2da7af8e5242a5ea78d1a11c49bf2910bb5a73853eb5"
+dependencies = [
+ "windows-link",
+]
+
+[[package]]
+name = "windows-strings"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7837d08f69c77cf6b07689544538e017c1bfcf57e34b4c0ff58e6c2cd3b37091"
+dependencies = [
+ "windows-link",
+]
+
+[[package]]
+name = "windows-sys"
+version = "0.61.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ae137229bcbd6cdf0f7b80a31df61766145077ddf49416a728b02cb3921ff3fc"
+dependencies = [
+ "windows-link",
+]
+
+[[package]]
+name = "winnow"
+version = "1.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "23b97319f7b8343df12cc98938e5c3eb436064524c8d2b4e30a1d3a36eecdf81"
+
+[[package]]
+name = "wl-clipboard-rs"
+version = "0.9.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4d7888ccd4896447b2d14d3a9350a85df2aeb6f181e2e7a31349d104ac46cac1"
+dependencies = [
+ "libc",
+ "log",
+ "os_pipe",
+ "rustix",
+ "thiserror",
+ "tree_magic_mini",
+ "wayland-backend",
+ "wayland-client",
+ "wayland-protocols",
+ "wayland-protocols-wlr",
+]
+
+[[package]]
+name = "xcursor"
+version = "0.3.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "163b33ed8786455e2fa5d72f554057ce3f3182425434f756cd39c99839d88e23"
+
+[[package]]
+name = "xkbcommon"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8d66ca9352cbd4eecbbc40871d8a11b4ac8107cfc528a6e14d7c19c69d0e1ac9"
+dependencies = [
+ "libc",
+ "memmap2",
+ "xkeysym",
+]
+
+[[package]]
+name = "xkeysym"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b9cc00251562a284751c9973bace760d86c0276c471b4be569fe6b068ee97a56"
+dependencies = [
+ "bytemuck",
+]
+
+[[package]]
+name = "zlib-rs"
+version = "0.6.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b268e58e7c693d7c271f93ffc4ba3b380412554231c85bf61ca7af91042a4112"
+
+[[package]]
+name = "zmij"
+version = "1.0.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "29666d0abbfad1e3dc4dcf6144730dd3a3ab225bbbdac83319345b1b44ccfc1b"
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..ac5fce2
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,32 @@
+[package]
+name = "valw"
+version = "0.1.0"
+edition = "2024"
+description = "macOS-style screenshots for niri"
+license = "MIT"
+
+[dependencies]
+anyhow = "1.0.104"
+chrono = "0.4.45"
+clap = { version = "4.6.7", features = ["derive"] }
+image = { version = "0.25.10", default-features = false, features = ["png"] }
+libc = "0.2.189"
+niri-ipc = "=26.4.0"
+rustix = { version = "1.1.5", features = ["event", "fs", "pipe", "process", "stdio"] }
+serde = { version = "1.0.229", features = ["derive"] }
+serde_ignored = "0.1.14"
+smithay-client-toolkit = "0.21.1"
+toml = "1.1.6"
+tracing = "0.1.44"
+tracing-subscriber = { version = "0.3.23", features = ["env-filter"] }
+wayland-client = "0.31.15"
+wayland-protocols = { version = "0.32.13", features = ["client", "staging"] }
+wayland-protocols-wlr = { version = "0.3.12", features = ["client"] }
+wl-clipboard-rs = "0.9.4"
+
+[dev-dependencies]
+tempfile = "3.27.0"
+
+# Image encoding is painfully slow unoptimised; keep dev builds usable.
+[profile.dev.package."*"]
+opt-level = 3
diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..58e7f71
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,48 @@
+{
+  "nodes": {
+    "flake-parts": {
+      "inputs": {
+        "nixpkgs-lib": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1788450739,
+        "narHash": "sha256-glZLQlzIn1fXH6PazR2iUmTo7kzzyYSshrWhLS9TqCU=",
+        "owner": "hercules-ci",
+        "repo": "flake-parts",
+        "rev": "31729ca8cbdb4fa927b34e5f4353e6a83f39e993",
+        "type": "github"
+      },
+      "original": {
+        "owner": "hercules-ci",
+        "repo": "flake-parts",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1790578696,
+        "narHash": "sha256-ZoxIApko70jCdbH3l20HWXOBaT2HZd87orzd2yJ9dVE=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "7a0f122f5090cf4c2ade2a13a0e229d4e19ba71f",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-parts": "flake-parts",
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..36ce584
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,30 @@
+{
+  description = "valw, macOS-style screenshots for niri";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+
+    flake-parts = {
+      url = "github:hercules-ci/flake-parts";
+      inputs.nixpkgs-lib.follows = "nixpkgs";
+    };
+  };
+
+  outputs =
+    inputs@{ flake-parts, ... }:
+    flake-parts.lib.mkFlake { inherit inputs; } (
+      { lib, ... }:
+      let
+        inherit (lib.filesystem) listFilesRecursive;
+        inherit (lib.lists) filter;
+        inherit (lib.strings) hasSuffix;
+      in
+      {
+        systems = [
+          "x86_64-linux"
+          "aarch64-linux"
+        ];
+        imports = filter (hasSuffix ".ulu.nix") (listFilesRecursive ./nix);
+      }
+    );
+}
diff --git a/nix/devshell.ulu.nix b/nix/devshell.ulu.nix
new file mode 100644
index 0000000..6bd8810
--- /dev/null
+++ b/nix/devshell.ulu.nix
@@ -0,0 +1,27 @@
+{ ... }:
+{
+  perSystem =
+    { pkgs, self', ... }:
+    {
+      devShells.default = pkgs.mkShell {
+        inputsFrom = [ self'.packages.default ];
+
+        packages = with pkgs; [
+          cargo-nextest
+          clippy
+          rust-analyzer
+          rustfmt
+          # Manual verification: grim is the pixel oracle, magick compares.
+          grim
+          imagemagick
+          wayland-utils
+        ];
+
+        # The repo is a path: flake, so Nix copies the whole tree on every
+        # evaluation. Keep the multi-gigabyte target dir out of it.
+        shellHook = ''
+          export CARGO_TARGET_DIR="''${XDG_CACHE_HOME:-$HOME/.cache}/valw/target"
+        '';
+      };
+    };
+}
diff --git a/nix/formatter.ulu.nix b/nix/formatter.ulu.nix
new file mode 100644
index 0000000..99db636
--- /dev/null
+++ b/nix/formatter.ulu.nix
@@ -0,0 +1,22 @@
+{ ... }:
+{
+  perSystem =
+    { pkgs, ... }:
+    {
+      formatter = pkgs.writeShellApplication {
+        name = "nixfmt-tree";
+        runtimeInputs = [
+          pkgs.nixfmt
+          pkgs.fd
+          pkgs.findutils
+        ];
+        text = ''
+          if [ "$#" -eq 0 ]; then
+            set -- .
+          fi
+          fd --type f --extension nix --hidden --exclude .jj . "$@" \
+            | xargs -r nixfmt
+        '';
+      };
+    };
+}
diff --git a/nix/package.ulu.nix b/nix/package.ulu.nix
new file mode 100644
index 0000000..af1db0a
--- /dev/null
+++ b/nix/package.ulu.nix
@@ -0,0 +1,40 @@
+{ ... }:
+{
+  perSystem =
+    { pkgs, lib, ... }:
+    {
+      packages.default = pkgs.rustPlatform.buildRustPackage {
+        pname = "valw";
+        version = "0.1.0";
+
+        src = lib.cleanSourceWith {
+          src = ../.;
+          filter =
+            path: _type:
+            !(builtins.elem (baseNameOf path) [
+              ".direnv"
+              ".jj"
+              "result"
+              "target"
+            ]);
+        };
+
+        cargoLock.lockFile = ../Cargo.lock;
+
+        nativeBuildInputs = [ pkgs.pkg-config ];
+        buildInputs = [
+          pkgs.libxkbcommon
+          pkgs.wayland
+        ];
+
+        # Tests run through `nix flake check` instead.
+        doCheck = false;
+
+        meta = {
+          description = "macOS-style screenshots for niri";
+          mainProgram = "valw";
+          platforms = lib.platforms.linux;
+        };
+      };
+    };
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..4e0e973
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,12 @@
+// Modules land before the CLI uses them; Task 11 removes this.
+#![allow(dead_code)]
+
+use clap::Parser;
+
+#[derive(Parser)]
+#[command(version, about = "macOS-style screenshots for niri")]
+struct Cli {}
+
+fn main() {
+    Cli::parse();
+}