refactor: move the client's input modules into horizon-client-input

Key bindings and names, toggle keys, mouse options, controller settings,
the clipboard and window options move to their own crate, re-exported under
their old paths. Their unit tests now rebuild in about a second after an
edit instead of rebuilding the client lib's test binary.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

AGENTS.md

@@ -38,6 +38,7 @@ Game workspace (root `Cargo.toml`); `launcher/` and `crates/horizon-telemetry-se
 | `horizon-client` | The game: a lib (`src/lib.rs`, ~180 flat modules) and the bin (`src/main.rs` → `game.rs` + `game/`), plus `horizon-ctl` (`src/bin/horizon-ctl/`). Also the dedicated server (`--dedicated`) |
 | `horizon-command` | Command parsing (Brigadier): the vanilla tree, argument types, selectors, suggestions, the tree's network form. Re-exported as `horizon_client::command` |
 | `horizon-client-core` | The client lib's bottom layer: `text.rs`, `lang.rs`, `snbt.rs`, `nbt_path.rs`, `component.rs`, `scoreboard.rs`, `bossbar.rs`, `gamerules.rs`, `block_entity_nbt.rs`, registry/particle/sound tables. Re-exported under the old paths (`horizon_client::text`...) |
+| `horizon-client-input` | Key bindings and key names, toggle keys, mouse options, controller settings and glyphs, the clipboard, window options (`keybinds.rs`, `gamepad.rs`, `mouse.rs`, `window.rs`...). Re-exported under the old paths |
 | `horizon-world` | Vanilla world data with no gameplay loop: NBT, regions, chunks, `datafix/`, `worldgen/`, `level/` (server-side block behaviour, ticks, redstone), entity physics, items, effects, food, damage |
 | `horizon-core` | Simulation primitives: Java `Random`s, `jmath` (HotSpot-exact `Math`), positions, noise, density, paletted storage, `version.rs` (the pinned version) |
 | `horizon-protocol` | Network protocol 777: codecs, framing, encryption, `packets/{handshake,status,login,configuration,play}.rs`, `entity_data.rs` |
@@ -112,7 +113,7 @@ python3 tools/agent_control_e2e.py         # horizon-ctl / MCP end to end
 
 | Subsystem | Files |
 |---|---|
-| Game loop, tick, frame | `game.rs`: `fn run`, `impl ApplicationHandler for Game` (`window_event`, `about_to_wait`), `fn tick`, `fn tick_world`, `fn render`; L: `clock.rs`, `window.rs`, `spans.rs` |
+| Game loop, tick, frame | `game.rs`: `fn run`, `impl ApplicationHandler for Game` (`window_event`, `about_to_wait`), `fn tick`, `fn tick_world`, `fn render`; L: `clock.rs`, `spans.rs`; `horizon-client-input/src/window.rs` |
 | Rendering | L: `gfx.rs` (`Renderer::new`, `Renderer::render`), `gfx/` (cull, occlusion, translucency, upload, timing, lod, weather, stars, end_sky), `*.wgsl`, `particles.rs`, `block_entity_render.rs`, `item_render.rs`, `fog.rs`, `clouds.rs`, `camera.rs`, `first_person.rs`; G: `render_tick.rs`, `item_draw.rs` |
 | Chunks, streaming, light | L: `streaming.rs` (worker pool: generate, light, mesh), `world.rs`, `chunk.rs`, `chunk_map.rs`, `light.rs`, `mesher.rs` + `mesher/`, `vanillagen.rs` (binds horizon-world's generator), `lod.rs` + `lod/`, `ticket_levels.rs`; G: `world_loading.rs`, `postprocess.rs`; game.rs `fn update_world` |
 | World generation | `crates/horizon-world/src/worldgen/` (`generator*.rs`, `feature_graph.rs`, `structure/`, `carver/`) |
@@ -128,7 +129,7 @@ python3 tools/agent_control_e2e.py         # horizon-ctl / MCP end to end
 | Integrated server | G: `integrated.rs` (the server thread), `levels.rs` (one level per dimension, `fn tick_server`), `server_travel.rs` |
 | Dedicated server | G: `dedicated.rs`, `dedicated/status.rs`; crates `horizon-server-files`, `horizon-server` |
 | Save and load | L: `save.rs` (level.dat, regions, playerdata), `entity_nbt.rs`, `options_file.rs`; `horizon-client-core/src/block_entity_nbt.rs`; G: `saving.rs`, `persist.rs` (entities); `crates/horizon-world/src/{region.rs,nbt.rs,datafix/}` |
-| Input | game.rs `fn window_event`, `fn key_pressed`, `fn play_mouse`; L: `keybinds.rs`, `keymapping.rs`, `key_names.rs`, `mouse.rs`, `input.rs`, `interaction_input.rs`, `gamepad.rs`, `osk.rs`, `clipboard.rs`; G: `pad.rs`, `pad_menu.rs` |
+| Input | game.rs `fn window_event`, `fn key_pressed`, `fn play_mouse`; crate `horizon-client-input` (`keybinds.rs`, `keymapping.rs`, `key_names.rs`, `mouse.rs`, `input.rs`, `interaction_input.rs`, `gamepad.rs`, `clipboard.rs`); L: `osk.rs`; G: `pad.rs`, `pad_menu.rs` |
 | Audio | L: `audio.rs` (mixer), `sound_engine.rs`, `sound_events.rs`, `music.rs`, `ambience.rs`; G: `music.rs`, `subtitle_hud.rs` |
 | Resource packs | L: `packs.rs` + `packs/`, `pack_screen.rs`, `atlas_sources.rs`, `sprites.rs`, `mipmap.rs`, `model_library.rs`, `font.rs`; `horizon-client-core/src/lang.rs`; crate `horizon-assets`; G: `packs.rs` |
 | Agent control | L: `control.rs` (socket), `bin/horizon-ctl/`; G: `control.rs`, `agent.rs`, `events.rs`, `ui_control.rs` ([docs/agent-control.md](docs/agent-control.md)) |

Cargo.lock

@@ -1363,7 +1363,6 @@ name = "horizon-client"
 version = "0.1.0"
 dependencies = [
  "ab_glyph",
- "arboard",
  "bytemuck",
  "chrono",
  "cpal",
@@ -1373,6 +1372,7 @@ dependencies = [
  "horizon-assets",
  "horizon-bench",
  "horizon-client-core",
+ "horizon-client-input",
  "horizon-command",
  "horizon-core",
  "horizon-dualsense",
@@ -1413,6 +1413,18 @@ dependencies = [
  "serde_json",
 ]
 
+[[package]]
+name = "horizon-client-input"
+version = "0.1.0"
+dependencies = [
+ "arboard",
+ "horizon-client-core",
+ "horizon-dualsense",
+ "horizon-theme",
+ "png",
+ "winit",
+]
+
 [[package]]
 name = "horizon-command"
 version = "0.1.0"

Cargo.toml

@@ -8,6 +8,7 @@ members = [
     "crates/horizon-world",
     "crates/horizon-client",
     "crates/horizon-client-core",
+    "crates/horizon-client-input",
     "crates/horizon-command",
     "crates/horizon-server-files",
     "crates/horizon-server",

crates/horizon-client-input/Cargo.toml

@@ -0,0 +1,23 @@
+[package]
+name = "horizon-client-input"
+version = "0.1.0"
+edition.workspace = true
+license.workspace = true
+rust-version = "1.90"
+description = "The client's input layer: key bindings and their names, mouse, controllers, clipboard and window options"
+
+[dependencies]
+horizon-client-core = { path = "../horizon-client-core" }
+winit = "0.30.13"
+# The window icon.
+horizon-theme = { path = "../horizon-theme" }
+png = "0.18"
+arboard = { version = "3.6.1", default-features = false, features = ["wayland-data-control"] }
+# The DualSense's trigger effects (the `controllers` feature).
+horizon-dualsense = { path = "../horizon-dualsense", optional = true }
+
+[features]
+controllers = ["dep:horizon-dualsense"]
+
+[lints]
+workspace = true

crates/horizon-client-input/src/lib.rs

@@ -0,0 +1,14 @@
+//! The client's input layer, below gameplay and screens: key bindings and their
+//! names, toggle keys, mouse settings, controllers, the clipboard and window
+//! options. horizon-client re-exports each module under its old path
+//! (`horizon_client::keybinds`, ...).
+#![forbid(unsafe_code)]
+pub mod clipboard;
+pub mod gamepad;
+pub mod input;
+pub mod interaction_input;
+pub mod key_names;
+pub mod keybinds;
+pub mod keymapping;
+pub mod mouse;
+pub mod window;

crates/horizon-client/Cargo.toml

@@ -10,6 +10,7 @@ description = "Horizon native development client"
 [dependencies]
 horizon-assets = { path = "../horizon-assets" }
 horizon-client-core = { path = "../horizon-client-core" }
+horizon-client-input = { path = "../horizon-client-input" }
 horizon-command = { path = "../horizon-command" }
 horizon-core = { path = "../horizon-core" }
 # The server thread ahead of the workers (MinecraftServer.spin's Thread.setPriority).
@@ -54,7 +55,6 @@ horizon-theme = { path = "../horizon-theme" }
 # the anonymous "I'm playing" ping the game sends itself (`heartbeat.rs`).
 horizon-telemetry = { path = "../horizon-telemetry", default-features = false, features = ["live"] }
 horizon-bench = { path = "../horizon-bench" }
-arboard = { version = "3.6.1", default-features = false, features = ["wayland-data-control"] }
 zip = { version = "2", default-features = false, features = ["deflate"] }
 # Controllers (evdev + libudev on Linux, IOKit on macOS, Windows.Gaming.Input); the `controllers` feature.
 gilrs = { version = "0.11", optional = true }
@@ -88,7 +88,7 @@ default = ["audio", "controllers"]
 # Linux: the server build (`--no-default-features`, released as horizon-engine; docs/server.md).
 audio = ["dep:cpal"]
 # Controllers: gilrs, and the DualSense's own output. Without it only `horizon-ctl pad`'s virtual pad.
-controllers = ["dep:gilrs", "dep:horizon-dualsense"]
+controllers = ["dep:gilrs", "dep:horizon-dualsense", "horizon-client-input/controllers"]
 # Runs code mods (wasmtime and cranelift: a quarter of a clean build). On in every release build
 # (release.yml); the tests and probes don't need it. Content mods load without it.
 mods = ["horizon-mods/runtime"]

crates/horizon-client/src/lib.rs

@@ -32,7 +32,6 @@ pub mod cauldron;
 pub mod chat;
 pub mod chunk;
 pub mod chunk_map;
-pub mod clipboard;
 pub mod clock;
 pub mod clouds;
 pub mod collisions;
@@ -74,7 +73,6 @@ pub mod fog;
 pub mod font;
 pub mod friends_screen;
 pub mod game_mode_switcher;
-pub mod gamepad;
 pub mod gfx;
 pub mod gizmos;
 pub mod gossip;
@@ -88,8 +86,6 @@ pub mod hud;
 pub mod hud_layout;
 pub mod hud_overlays;
 pub mod hunger;
-pub mod input;
-pub mod interaction_input;
 pub mod inv_sort;
 pub mod inventory_effects;
 pub mod item_data;
@@ -98,9 +94,6 @@ pub mod item_sync;
 pub mod item_tooltip;
 pub mod items;
 pub mod java_text;
-pub mod key_names;
-pub mod keybinds;
-pub mod keymapping;
 pub mod lan;
 pub mod landing;
 pub mod level_loading;
@@ -120,7 +113,6 @@ pub mod mod_list;
 mod model_library;
 pub mod models;
 pub mod motion;
-pub mod mouse;
 pub mod moved_extras;
 pub mod multiplayer;
 pub mod music;
@@ -190,7 +182,6 @@ pub mod vault;
 pub mod weather;
 pub mod widgets;
 pub mod win_screen;
-pub mod window;
 pub mod world;
 pub mod world_spawn;
 pub mod worldborder;
@@ -206,4 +197,13 @@ pub use horizon_client_core::nbt_path;
 pub use horizon_client_core::scoreboard;
 pub use horizon_client_core::snbt;
 pub use horizon_client_core::text;
+pub use horizon_client_input::clipboard;
+pub use horizon_client_input::gamepad;
+pub use horizon_client_input::input;
+pub use horizon_client_input::interaction_input;
+pub use horizon_client_input::key_names;
+pub use horizon_client_input::keybinds;
+pub use horizon_client_input::keymapping;
+pub use horizon_client_input::mouse;
+pub use horizon_client_input::window;
 pub use horizon_command as command;

docs/controllers.md

@@ -25,7 +25,7 @@ Select/Start). No second windowing or event stack: gilrs is polled once per
 loop iteration next to winit's events.
 
 - The pure logic (mapping table, deadzones and curves, button edges, the
-  settings file, glyph choice) lives in `crates/horizon-client/src/gamepad.rs`
+  settings file, glyph choice) lives in `crates/horizon-client-input/src/gamepad.rs`
   and is unit-tested. The game owns a thin gilrs backend and applies actions.
 - Controller actions go through the same path a keyboard key takes after
   rebinding: an action names a vanilla key mapping (`key.jump`, `key.attack`,

tools/test_frame_limiter_parity.py

@@ -62,7 +62,7 @@ def main():
              'real OS sleep accuracy is outside the comparison.')
     harness.differential(
         'rust-frame-limiter-parity', 'VanillaFrameLimiterOracle', 'frame_limiter_probe', make_cases, scope,
-        sources=[lab.ROOT / 'crates/horizon-client/src/window.rs'])
+        sources=[lab.ROOT / 'crates/horizon-client-input/src/window.rs'])
 
 
 if __name__ == '__main__':

tools/test_interaction_input_parity.py

@@ -43,7 +43,7 @@ def main():
         "Includes passing entity interactions over solid blocks: only the held "
         "item may be tried afterward. "
         "Game-mode side effects and world simulation are controlled fixtures.",
-        sources=[lab.ROOT / "crates/horizon-client/src/interaction_input.rs",
+        sources=[lab.ROOT / "crates/horizon-client-input/src/interaction_input.rs",
                  lab.ROOT / "crates/horizon-client/src/game/remote.rs",
                  lab.ROOT / "crates/horizon-client/src/game/hand.rs",
                  lab.ROOT / "mods/horizon/src/test/java/dev/horizonlab/parity/ParityData.java"])

tools/test_local_input_parity.py

@@ -35,7 +35,7 @@ def main():
     build=lab.LOCAL/'rust-local-input';build.mkdir(exist_ok=True)
     report=build/'report.json';report.unlink(missing_ok=True)
     oracle=lab.ROOT/'mods/horizon/src/test/java/dev/horizonlab/parity/VanillaLocalInputOracle.java'
-    sources=[Path(__file__),lab.ROOT/'tools/test_rust_parity.py',lab.ROOT/'tools/test_model_baking_parity.py',lab.ROOT/'tools/lab.py',oracle,lab.ROOT/'Cargo.toml',lab.ROOT/'Cargo.lock',lab.ROOT/'crates/horizon-client/Cargo.toml',lab.ROOT/'crates/horizon-client/src/input.rs',lab.ROOT/'crates/horizon-client/src/lib.rs',lab.ROOT/'crates/horizon-client/examples/probe/input_probe.rs']
+    sources=[Path(__file__),lab.ROOT/'tools/test_rust_parity.py',lab.ROOT/'tools/test_model_baking_parity.py',lab.ROOT/'tools/lab.py',oracle,lab.ROOT/'Cargo.toml',lab.ROOT/'Cargo.lock',lab.ROOT/'crates/horizon-client/Cargo.toml',lab.ROOT/'crates/horizon-client-input/src/input.rs',lab.ROOT/'crates/horizon-client/src/lib.rs',lab.ROOT/'crates/horizon-client/examples/probe/input_probe.rs']
     tested=base.source_hashes(sources)
     def run(command,name):
         with (build/(name+'.log')).open('w') as log:subprocess.run(list(map(str,command)),cwd=lab.ROOT,check=True,timeout=600,stdout=log,stderr=subprocess.STDOUT)

tools/test_options_parity.py

@@ -189,8 +189,8 @@ def main():
     harness.differential(
         'rust-options-parity', 'VanillaOptionsOracle', 'options_probe', make_cases, scope,
         sources=[lab.ROOT / 'crates/horizon-client/src/options_file.rs', lab.ROOT / 'crates/horizon-client/src/options_fixes.rs',
-                 lab.ROOT / 'crates/horizon-client/src/java_text.rs', lab.ROOT / 'crates/horizon-client/src/key_names.rs',
-                 lab.ROOT / 'crates/horizon-client/src/keybinds.rs'])
+                 lab.ROOT / 'crates/horizon-client/src/java_text.rs', lab.ROOT / 'crates/horizon-client-input/src/key_names.rs',
+                 lab.ROOT / 'crates/horizon-client-input/src/keybinds.rs'])
 
 
 if __name__ == '__main__':

tools/test_sprint_input_parity.py

@@ -40,7 +40,7 @@ def main():
     build=lab.LOCAL/'rust-sprint-input';build.mkdir(exist_ok=True)
     report=build/'report.json';report.unlink(missing_ok=True)
     oracle=lab.ROOT/'mods/horizon/src/test/java/dev/horizonlab/parity/VanillaSprintInputOracle.java'
-    sources=[Path(__file__),lab.ROOT/'tools/test_rust_parity.py',lab.ROOT/'tools/test_model_baking_parity.py',lab.ROOT/'tools/lab.py',oracle,lab.ROOT/'Cargo.toml',lab.ROOT/'Cargo.lock',lab.ROOT/'crates/horizon-client/Cargo.toml',lab.ROOT/'crates/horizon-client/src/input.rs',lab.ROOT/'crates/horizon-client/src/sprint.rs',lab.ROOT/'crates/horizon-client/src/lib.rs',lab.ROOT/'crates/horizon-client/examples/probe/sprint_probe.rs']
+    sources=[Path(__file__),lab.ROOT/'tools/test_rust_parity.py',lab.ROOT/'tools/test_model_baking_parity.py',lab.ROOT/'tools/lab.py',oracle,lab.ROOT/'Cargo.toml',lab.ROOT/'Cargo.lock',lab.ROOT/'crates/horizon-client/Cargo.toml',lab.ROOT/'crates/horizon-client-input/src/input.rs',lab.ROOT/'crates/horizon-client/src/sprint.rs',lab.ROOT/'crates/horizon-client/src/lib.rs',lab.ROOT/'crates/horizon-client/examples/probe/sprint_probe.rs']
     tested=base.source_hashes(sources)
     def run(command,name):
         with (build/(name+'.log')).open('w') as log:subprocess.run(list(map(str,command)),cwd=lab.ROOT,check=True,timeout=600,stdout=log,stderr=subprocess.STDOUT)

tools/test_toggle_keys_parity.py

@@ -69,7 +69,7 @@ def main():
              'not exercised; KeyboardInput then reads isDown as the sprint and local input harnesses compare.')
     harness.differential(
         'rust-toggle-keys-parity', 'VanillaToggleKeysOracle', 'toggle_keys_probe', make_cases, scope,
-        sources=[lab.ROOT / 'crates/horizon-client/src/keymapping.rs'])
+        sources=[lab.ROOT / 'crates/horizon-client-input/src/keymapping.rs'])
 
 
 if __name__ == '__main__':