chore: convert to cargo workspace with four crates

Cargo.toml

@@ -1,6 +1,35 @@
-[package]
-name = "xy"
-version = "0.1.0"
-edition = "2024"
+[workspace]
+resolver = "2"
+members = [
+    "crates/xy-protocol",
+    "crates/xy-supervisor",
+    "crates/xy-ipc",
+    "crates/xy",
+]
 
-[dependencies]
+[workspace.package]
+edition = "2024"
+version = "0.1.0"
+license = "MIT OR Apache-2.0"
+
+[workspace.dependencies]
+xy-protocol = { path = "crates/xy-protocol" }
+xy-supervisor = { path = "crates/xy-supervisor" }
+xy-ipc = { path = "crates/xy-ipc" }
+
+tokio = { version = "1", features = ["rt-multi-thread", "net", "process", "signal", "sync", "fs", "io-util", "macros", "time"] }
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+thiserror = "2"
+anyhow = "1"
+tracing = "0.1"
+tracing-subscriber = { version = "0.3", features = ["env-filter"] }
+clap = { version = "4", features = ["derive"] }
+kdl = "6"
+etcetera = "0.10"
+nix = { version = "0.30", features = ["signal", "process"] }
+humantime = "2"
+humantime-serde = "1"
+async-trait = "0.1"
+tempfile = "3"
+tokio-test = "0.4"

crates/xy-ipc/Cargo.toml

@@ -0,0 +1,16 @@
+[package]
+name = "xy-ipc"
+edition.workspace = true
+version.workspace = true
+license.workspace = true
+
+[dependencies]
+xy-protocol.workspace = true
+tokio.workspace = true
+serde.workspace = true
+serde_json.workspace = true
+tracing.workspace = true
+thiserror.workspace = true
+
+[dev-dependencies]
+tempfile.workspace = true

crates/xy-ipc/src/lib.rs

@@ -0,0 +1 @@
+//! JSON-RPC 2.0 over newline-delimited JSON on a Unix socket.

crates/xy-protocol/Cargo.toml

@@ -0,0 +1,16 @@
+[package]
+name = "xy-protocol"
+edition.workspace = true
+version.workspace = true
+license.workspace = true
+
+[dependencies]
+serde.workspace = true
+serde_json.workspace = true
+thiserror.workspace = true
+kdl.workspace = true
+humantime.workspace = true
+humantime-serde.workspace = true
+
+[dev-dependencies]
+tempfile.workspace = true

crates/xy-protocol/src/lib.rs

@@ -0,0 +1 @@
+//! Wire types and config schema shared between the xy daemon and CLI.

crates/xy-supervisor/Cargo.toml

@@ -0,0 +1,17 @@
+[package]
+name = "xy-supervisor"
+edition.workspace = true
+version.workspace = true
+license.workspace = true
+
+[dependencies]
+xy-protocol.workspace = true
+tokio.workspace = true
+tracing.workspace = true
+thiserror.workspace = true
+nix.workspace = true
+async-trait.workspace = true
+
+[dev-dependencies]
+tokio-test.workspace = true
+tempfile.workspace = true

crates/xy-supervisor/src/lib.rs

@@ -0,0 +1 @@
+//! Process-supervision primitives for the xy daemon.

crates/xy/Cargo.toml

@@ -0,0 +1,27 @@
+[package]
+name = "xy"
+edition.workspace = true
+version.workspace = true
+license.workspace = true
+
+[[bin]]
+name = "xy"
+path = "src/main.rs"
+
+[dependencies]
+xy-protocol.workspace = true
+xy-supervisor.workspace = true
+xy-ipc.workspace = true
+tokio.workspace = true
+clap.workspace = true
+serde.workspace = true
+serde_json.workspace = true
+tracing.workspace = true
+tracing-subscriber.workspace = true
+anyhow.workspace = true
+etcetera.workspace = true
+nix.workspace = true
+humantime.workspace = true
+
+[dev-dependencies]
+tempfile.workspace = true

crates/xy/src/main.rs

@@ -0,0 +1,3 @@
+fn main() {
+    println!("xy: not implemented yet");
+}

src/main.rs

@@ -1,3 +0,0 @@
-fn main() {
-    println!("Hello, world!");
-}