docs: improve handling on features

.github/workflows/docs.yml

@@ -17,6 +17,9 @@ jobs:
           toolchain: stable
           override: true
       - uses: actions-rs/cargo@v1
+        env:
+          RUSTFLAGS: --cfg docsrs
+          RUSTDOCFLAGS: --cfg docsrs
         with:
           command: doc
           args: --package mpris-server --features "unstable" --no-deps

Cargo.toml

@@ -19,9 +19,14 @@ futures-util = { version = "0.3", default-features = false, features = ["std"] }
 serde = "1.0"
 zbus = "3.14"
 
-[features]
-unstable = []
-
 [dev-dependencies]
 async-std = { version = "1.12", features = ["attributes", "unstable"] }
 static_assertions = "1.1"
+
+[features]
+unstable = []
+
+[package.metadata.docs.rs]
+features = ["unstable"]
+rustc-args = ["--cfg", "docsrs"]
+rustdoc-args = ["--cfg", "docsrs", "--generate-link-to-definition"]

src/local_server.rs

@@ -604,6 +604,7 @@ where
     ///
     /// If you needed to call this, consider filing an issue.
     #[cfg(feature = "unstable")]
+    #[cfg_attr(docsrs, doc(cfg(feature = "unstable")))]
     #[inline]
     pub fn connection(&self) -> &Connection {
         self.inner.connection()

src/server.rs

@@ -412,6 +412,7 @@ where
     ///
     /// If you needed to call this, consider filing an issue.
     #[cfg(feature = "unstable")]
+    #[cfg_attr(docsrs, doc(cfg(feature = "unstable")))]
     #[inline]
     pub fn connection(&self) -> &Connection {
         &self.connection