init

.direnv/flake-profile

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+flake-profile-2-link

.direnv/flake-profile-2-link

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+/nix/store/dyzaj39zgs8x6qypyzwqvabbwihk5hzm-nix-shell-env

.envrc

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+use flake

Cargo.toml

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+[package]
+name = "barbar"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+iced = { version = "0.14", default-features = false, features = ["wgpu", "wayland", "crisp", "web-colors", "thread-pool"] }
+iced_layershell = { version = "0.19", default-features = false }

flake.lock

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+{
+  "nodes": {
+    "crane": {
+      "locked": {
+        "lastModified": 1787326676,
+        "narHash": "sha256-lWhBbBvC05/xwivKBBiM2YNizpmgqCgyOIzomvRuwxs=",
+        "owner": "ipetkov",
+        "repo": "crane",
+        "rev": "692f7e9ef2ece8125b466f66f2af532b3edaed0d",
+        "type": "github"
+      },
+      "original": {
+        "owner": "ipetkov",
+        "repo": "crane",
+        "type": "github"
+      }
+    },
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1731533236,
+        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1787964612,
+        "narHash": "sha256-0N9nghg3nwzX6b6qc77EzjR9cu/Z+UR66FlfsCqiURs=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "e8be7818e19ada32105a8af937a6a473b38167ca",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "crane": "crane",
+        "flake-utils": "flake-utils",
+        "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

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+{
+  description = "Build a cargo project without extra checks";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+
+    crane.url = "github:ipetkov/crane";
+
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs =
+    {
+      self,
+      nixpkgs,
+      crane,
+      flake-utils,
+      ...
+    }:
+    flake-utils.lib.eachDefaultSystem (
+      system:
+      let
+        pkgs = nixpkgs.legacyPackages.${system};
+
+        craneLib = crane.mkLib pkgs;
+
+        # Runtime/shared libraries required by iced/iced_layershell/winit.
+        # winit dlopens libwayland at runtime, so these must be on
+        # LD_LIBRARY_PATH (see https://github.com/iced-rs/iced/issues/2385).
+        guiLibs = [
+          pkgs.wayland
+          pkgs.wayland-protocols
+          pkgs.libxkbcommon
+          pkgs.vulkan-loader
+          pkgs.libx11
+          pkgs.libxcursor
+          pkgs.libxrandr
+          pkgs.libxi
+          pkgs.libxcb
+        ];
+
+        # Common arguments can be set here to avoid repeating them later
+        # Note: changes here will rebuild all dependency crates
+        commonArgs = {
+          # Exclude build outputs regardless of git state (this repo is not
+          # git-initialized, so cleanCargoSource would otherwise copy target/).
+          src = pkgs.lib.cleanSourceWith {
+            src = ./.;
+            filter = path: type:
+              let
+                base = baseNameOf (toString path);
+              in
+              !(type == "directory" && (base == "target" || base == "result" || base == ".direnv"));
+          };
+          strictDeps = true;
+
+          nativeBuildInputs = [
+            pkgs.pkg-config
+          ];
+
+          buildInputs =
+            guiLibs
+            ++ pkgs.lib.optionals pkgs.stdenv.hostPlatform.isDarwin [
+              # Additional darwin specific inputs can be set here
+              pkgs.libiconv
+            ];
+        };
+
+        my-crate = craneLib.buildPackage (
+          commonArgs
+          // {
+            cargoArtifacts = craneLib.buildDepsOnly commonArgs;
+
+            # Additional environment variables or build phases/hooks can be set
+            # here *without* rebuilding all dependency crates
+            # MY_CUSTOM_VAR = "some value";
+          }
+        );
+      in
+      {
+        checks = {
+          inherit my-crate;
+        };
+
+        packages.default = my-crate;
+
+        apps.default = flake-utils.lib.mkApp {
+          drv = my-crate;
+        };
+
+        devShells.default = craneLib.devShell {
+          # Inherit inputs from checks.
+          checks = self.checks.${system};
+
+          # Put the GUI shared libraries on the runtime library path so winit
+          # can dlopen libwayland and wgpu can find the vulkan loader.
+          shellHook = ''
+            export LD_LIBRARY_PATH="$LD_LIBRARY_PATH:${pkgs.lib.makeLibraryPath guiLibs}"
+          '';
+
+          # Extra inputs can be added here; cargo and rustc are provided by default.
+          packages = guiLibs;
+        };
+      }
+    );
+}

src/main.rs

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+//! barbar — a Wayland layer-shell status bar built on `iced` + `iced_layershell`.
+//!
+//! Renders a full-width bar pinned to the top of the screen via the
+//! `wlr-layer-shell` protocol. Optionally target a specific output by
+//! passing its name as the first CLI argument.
+
+use iced::widget::{row, text};
+use iced::{Alignment, Element, Length, Task, Theme};
+use iced_layershell::application;
+use iced_layershell::reexport::Anchor;
+use iced_layershell::settings::{LayerShellSettings, StartMode, Settings};
+use iced_layershell::to_layer_message;
+
+/// Height of the bar in logical pixels.
+const BAR_HEIGHT: u32 = 36;
+
+/// Optional width of the bar; `None` means "as wide as the output".
+const BAR_WIDTH: Option<u32> = None;
+
+pub fn main() -> Result<(), iced_layershell::Error> {
+    // Target a specific output if one was given, otherwise the active one.
+    let start_mode = match std::env::args().nth(1) {
+        Some(output) => StartMode::TargetScreen(output),
+        None => StartMode::Active,
+    };
+
+    application(Bar::default, namespace, update, view)
+        .style(style)
+        .settings(Settings {
+            layer_settings: LayerShellSettings {
+                size: Some((BAR_WIDTH.unwrap_or(0), BAR_HEIGHT)),
+                exclusive_zone: BAR_HEIGHT as i32,
+                anchor: Anchor::Top | Anchor::Left | Anchor::Right,
+                start_mode,
+                ..Default::default()
+            },
+            ..Default::default()
+        })
+        .run()
+}
+
+/// Application state. Empty for now; placeholders will evolve into
+/// workspace/clock/system modules.
+#[derive(Debug, Default)]
+struct Bar;
+
+/// Messages produced by user input, events and subscriptions.
+#[to_layer_message]
+#[derive(Debug, Clone)]
+enum Message {
+    /// No-op used as a fallback target for pending subscriptions.
+    Noop,
+}
+
+fn namespace() -> String {
+    String::from("barbar")
+}
+
+fn update(_bar: &mut Bar, _message: Message) -> Task<Message> {
+    Task::none()
+}
+
+fn view(_bar: &Bar) -> Element<'_, Message> {
+    row![
+        text("workspaces").size(14),
+        text("|").size(14),
+        text("clock").size(14),
+        text("|").size(14),
+        text("system").size(14),
+    ]
+    .spacing(12)
+    .padding(8)
+    .align_y(Alignment::Center)
+    .width(Length::Fill)
+    .height(Length::Fill)
+    .into()
+}
+
+fn style(_bar: &Bar, theme: &Theme) -> iced::theme::Style {
+    use iced::theme::Style;
+    Style {
+        background_color: theme.palette().background,
+        text_color: theme.palette().text,
+    }
+}