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This is the story of lambdock: https://codeberg.org/jjba23/lambdock lambdock is a modern, hyper-hackable, Wayland-native desktop dock application (C and Guile Scheme + GTK4) w/ REPL. As a heavy computer user, spending most of my day enjoying digital life, and as an eye-candy enjoyer and workflow optimization afficionado, I have long dreamt of the ultimate desktop dock. Here’s the story behind lambdock , the Wayland-native beast with infinite hackability, fluid physics animcations, instant responsiveness, and free as in freedom . But to get here, I will first take you through the mindset, the graveyard of failed prototypes, the uphill battles and the ultimate conquest of GTK4 C runtime, and embedding of a living, breathing, interactive Lisp heart. Quest for the eternal Dock # For years, desktop GNU/Linux users moving to Wayland faced a recurring tragedy: the loss of iconic, deeply hackable docks like Cairo-Dock and Plank. That being said, anno 2026, those (and other) projects have made great efforts to become Wayland-compatible, so that’s great. While bar engines like Waybar and EWW excel at status displays, a true application dock that can rival those heavyweights (and macOS too) requires a unique blend of layout positioning, dynamic window tracking, auto-hiding, and fluid hover physics for animations. lambdock’s is a story of resilience in many ways, as I cannot even remember how many attempts I made at building a dock (in different ways). Little did I know how many paradigms, ideas and PoCs would collapse before my vision became tangible reality. On the 30th of July 2026, I had a revelation and set out to build lambdock: a Wayland-native desktop dock that wouldn’t just replicate the macOS or Cairo-Dock experience, but would transcend it with full runtime inspectability, hackability, and Lisp enlightenment. I find GTK to be the very best UI toolkit for GNU/Linux and other platforms, anno 2026. So for me that choice was pretty clear, even if I also toyed with Qt and others, but GTK always came on top. After the wreckage of many PoCs and while reading some HackerNews in bed, a thought crossed my mind, and suddenly, absolute clarity! Why not use idiomatic modern GTK4, in the language that it’s written in. Oh wait, that language, C, has libguile.h, a great library inter-operability with Lisp (GNU Guile Scheme), allowing bi-directional bindings and communication. Why not go down this rabbit hole, which might at the same time teach me more about my favourite language (GNU Guile) and allow me a frictionless setup with GTK and native super performance. I therefore designed lambdock in my mind, in bed, much inspired by Emacs. A powerful, small C core that powers the program, rendering, graphics and low level details, and an embedded GNU Guile Scheme engine that at runtime is the heart and brain of the whole thing.
This architecture uniquely delivers interactive socket REPL control, Lisp metaprogramming macros, dynamic multi-dock spawning, native Wayland foreign-toplevel window tracking, and frame-clock-driven hover animations.
Graveyard of Prototypes # The journey to lambdock was paved with ambitious Proofs of Concept (PoCs) that ultimately died. I cycled through several languages, approaches, frameworks, and architecture experiments, chasing the dream of rapid development without sacrificing low-level display server control.
The quest initially aimed for a pure, 100% Lisp architecture using Guile GI and other existing Guile GTK bindings. However, this vision collapsed under sparse documentation and inscrutable binding layers. Bridging GTK’s imperative, object-oriented state with functional Scheme patterns created constant architectural friction, and a small community meant every binding edge-case became a dead end and a long dive in the rabbit hole. Trying Python + GTK3/4 offered rapid prototyping and a massive library ecosystem, but crashed into severe real-time performance limits. Single-threaded bottlenecks and Global Interpreter Lock (GIL) stutters ruined fluid slide-out animations unless backed by custom C code. That also triggered me to think, might as well just write this whole thing in C. Coupled with a heavy memory footprint and fragile IPC mechanisms, the runtime proved too heavy and unpredictable for a low-latency desktop dock. Attempts with Rust, GTK bindings, and custom compositor IPC promised memory safety and fearless concurrency, yet introduced severe verbosity and binding friction. Mismatches between Rust’s async event loops and GTK4’s main thread created structural problems, the borrow checker was a real PITA when working with GTK and the dynamic features I wanted to support, while the lack of reflection completely shut the door on (easily) embedding a live, interactive Lisp REPL. I made a final attempt by using JavaScript/Node and Layer Shell targeted familiar web-style styling and asynchronous I/O. However, this suffered from bloated resource consumption, poor integration with low-level Wayland protocols, and no clear pathway for Lisp extensibility, and thus it quickly gained its place in the graveyard of abandoned prototypes. Iron Skeleton, Lisp Soul # C + GTK4 + gtk4-layer-shell is the undisputed champion of native Wayland surface control. C provides raw speed, zero-cost GLib integration, memory layout efficiency, flawless Wayland scanner protocol generation and the best GTK documentation you can get. GNU Guile Scheme (libguile) is the ultimate runtime mind. Instead of configuring the dock with static, dead JSON or TOML files, embedding Lisp (Guile Scheme) via libguile.h gives the dock a living Lisp heart and turns it into an infinitely extensible program. int main(int argc, char **argv) { #ifdef DEFAULT_GSK_RENDERER g_setenv("GSK_RENDERER", DEFAULT_GSK_RENDERER, FALSE); #endif scm_boot_guile(argc, argv, inner_main, NULL); return 0; } By hosting libguile directly inside C’s GTK4 main loop, lambdock achieves what I consider the holy grail, much like GNU Emacs does: infinite extensibility, uncompromising native performance for rendering and animation, and metaprogramming superpowers of Lisp for user configuration and live REPL inspection. Etymology # The name lambdock is a play on words combining: Ship Docks ⚓ where containers and applications dock safely. lambda λ expressions from functional programming & Lisp enlightenment. Lambs 🐑 (gentle, fluffy, lightweight, and clean). Docks as desktop UI components (e.g., Plank, Cairo-Dock, macOS Dock).
lambdock adopts as its project logo the Agnus Dei: The Lamb of God carrying a cross and a red flag You could say using this dock es casi una experiencia religiosa como la de Enrique Iglesias Multi-Config & Multi-Dock Instance # lambdock features built-in multi-dock orchestration. Rather than being limited to a single dock bar, you can run multiple independent docks simultaneously across different screen edges or monitors. Automatic Directory Monitoring: lambdock watches ~/.config/lambdock/ for files matching settings.scm or settings-*.scm (e.g., settings-left.scm, settings-bottom.scm).
Each configuration file defines its own isolated LambdockState, position (dock-position), theme (dock-theme), monitor targets (dock-monitor), and item launcher layout (dock-items). Dynamic Spawning: Creating a new settings-2.scm file instantly spawns a new dock bar on screen.
Dynamic Hot-Reloading: Editing any settings-*.scm file hot-reloads that specific dock instance without flickering or restarting other running instances. Dynamic Destruction: Deleting a settings-*.scm file safely tears down and destroys its corresponding dock window, removing Wayland handles and GTK widgets without crashing the application. What systems does lambdock support? # lambdock is a GNU/Linux first utility. The tool uses gtk4-layer-shell to render to the screen and positioning and for dock behavior. That means it works well in Wayland compositors that support the wlr-layer-shell-unstable-v1 protocol, including: KDE Plasma (Wayland session) Smithay-based compositors: Niri, COSMIC Desktop wlroots-based compositors: Sway, Hyprland, River, Wayfire Mir-based compositors Note: GNOME (Mutter) currently not supported due to not implementing the protocol How the Bi-Directional Engine Works # lambdock is not merely configured by Scheme. It has an embedded, extensible Lisp engine and runtime environment which complements a high-performance C applciation core and graphics engine.
Execution flows bi-directionally between C and Guile. The entry point of the binary (main.c) boots the Guile interpreter using scm_boot_guile. The C runtime acts as the host and invokes Scheme procedures to manage state and extract settings. Scheme is not restricted to passive data declarations, as it can trigger actions inside the running C engine. lambdock provides a beautiful Lisp DSL for defining your dock, based on items and presets Scheme Constructor / Procedure Return Type Description Keyword Arguments (app-item ...) Record Custom application launcher definition #:name, #:exec, #:icon (dynamic-item ...) Record Dynamic polling widget displaying dynamic textual data #:name, #:icon, #:exec, #:poll-fn, #:interval-ms, #:hover-animate? (preset-launcher 'symbol) Record Standard launcher resolved from internal preset list Symbol (e.g. 'emacs, 'alacritty) (preset-launchers-for 'a 'b) List Batch helper returning a list of preset launchers Variadic list of symbols (separator-item) Record Layout divider line None (preset-icon 'symbol) String Resolves default icon name string for a given preset Symbol The magic of lambdock lies in the seamless bi-directional bridge between the C graphics core and the GNU Guile Scheme engine.