refactor sync-server into a lib crate with a binary

sync-server/src/lib.rs

@@ -0,0 +1,37 @@
+#![deny(clippy::all)]
+
+mod api;
+mod server;
+pub mod storage;
+
+use crate::storage::Storage;
+use actix_web::{get, web, Responder, Scope};
+use api::{api_scope, ServerState};
+
+#[get("/")]
+async fn index() -> impl Responder {
+    format!("TaskChampion sync server v{}", env!("CARGO_PKG_VERSION"))
+}
+
+/// A Server represents a sync server.
+#[derive(Clone)]
+pub struct Server {
+    storage: ServerState,
+}
+
+impl Server {
+    /// Create a new sync server with the given storage implementation.
+    pub fn new(storage: Box<dyn Storage>) -> Self {
+        Self {
+            storage: storage.into(),
+        }
+    }
+
+    /// Get an Actix-web service for this server.
+    pub fn service(&self) -> Scope {
+        web::scope("")
+            .data(self.storage.clone())
+            .service(index)
+            .service(api_scope())
+    }
+}