Document features automatically. (#2780)

* document features automatically.

* Document with `#[cfg(...)]`.

* Fix Clippy.

* Adjust unreleased docs header.

* Adapt dark mode as well.

api-docs/before-content.html

@@ -1,4 +1,4 @@
 <div id="unreleased-version-header">
-    <p>This is unreleased documentation for Yew Next version.</p>
-    <p>For up-to-date documentation, see <a href="https://docs.rs/yew">the latest version on docs.rs</a>.</p>
+    <div>This is unreleased documentation for Yew Next version.</div>
+    <div>For up-to-date documentation, see <a href="https://docs.rs/yew">the latest version on docs.rs</a>.</div>
 </div>

api-docs/styles.css

@@ -1,13 +1,23 @@
 #unreleased-version-header {
-    background-color: rgb(77, 56, 0);
+    background-color: rgb(200, 237, 248);
     z-index: 400;
-    position: fixed;
+    position: absolute;
     left: 0;
     top: 0;
     right: 0;
     height: 70px;
     padding-top: 10px;
+    padding-bottom: 10px;
     text-align: center;
+    font-family: sans-serif;
+    box-shadow: 0 0 5px 0 rgb(100, 100, 100);
+}
+
+@media (prefers-color-scheme: dark) {
+    #unreleased-version-header {
+        background-color: rgb(32, 43, 57);
+        box-shadow: 0 0 5px 0 black;
+    }
 }
 
 body {

packages/yew/src/app_handle.rs

@@ -9,7 +9,7 @@ use crate::dom_bundle::BSubtree;
 use crate::html::{BaseComponent, NodeRef, Scope, Scoped};
 
 /// An instance of an application.
-#[cfg_attr(documenting, doc(cfg(feature = "csr")))]
+#[cfg(feature = "csr")]
 #[derive(Debug)]
 pub struct AppHandle<COMP: BaseComponent> {
     /// `Scope` holder
@@ -65,7 +65,6 @@ fn clear_element(host: &Element) {
     }
 }
 
-#[cfg_attr(documenting, doc(cfg(feature = "hydration")))]
 #[cfg(feature = "hydration")]
 mod feat_hydration {
     use super::*;

packages/yew/src/dom_bundle/subtree_root.rs

@@ -232,7 +232,7 @@ static BUBBLE_EVENTS: AtomicBool = AtomicBool::new(true);
 /// handler has no effect.
 ///
 /// This function should be called before any component is mounted.
-#[cfg_attr(documenting, doc(cfg(feature = "csr")))]
+#[cfg(feature = "csr")]
 pub fn set_event_bubbling(bubble: bool) {
     BUBBLE_EVENTS.store(bubble, Ordering::Relaxed);
 }

packages/yew/src/functional/hooks/mod.rs

@@ -3,29 +3,21 @@ mod use_context;
 mod use_effect;
 mod use_force_update;
 mod use_memo;
-#[cfg_attr(documenting, doc(cfg(any(target_arch = "wasm32", feature = "tokio"))))]
-#[cfg(any(target_arch = "wasm32", feature = "tokio"))]
 mod use_prepared_state;
 mod use_reducer;
 mod use_ref;
 mod use_state;
-#[cfg_attr(documenting, doc(cfg(any(target_arch = "wasm32", feature = "tokio"))))]
-#[cfg(any(target_arch = "wasm32", feature = "tokio"))]
 mod use_transitive_state;
 
 pub use use_callback::*;
 pub use use_context::*;
 pub use use_effect::*;
 pub use use_force_update::*;
 pub use use_memo::*;
-#[cfg_attr(documenting, doc(cfg(any(target_arch = "wasm32", feature = "tokio"))))]
-#[cfg(any(target_arch = "wasm32", feature = "tokio"))]
 pub use use_prepared_state::*;
 pub use use_reducer::*;
 pub use use_ref::*;
 pub use use_state::*;
-#[cfg_attr(documenting, doc(cfg(any(target_arch = "wasm32", feature = "tokio"))))]
-#[cfg(any(target_arch = "wasm32", feature = "tokio"))]
 pub use use_transitive_state::*;
 
 use crate::functional::HookContext;

packages/yew/src/functional/hooks/use_prepared_state/mod.rs

@@ -89,7 +89,6 @@ pub use feat_ssr::*;
 /// Whilst async closure is an unstable feature, the procedural macro will rewrite this to a
 /// closure that returns an async block automatically. You can use this hook with async closure
 /// in stable Rust.
-#[cfg_attr(documenting, doc(cfg(any(target_arch = "wasm32", feature = "tokio"))))]
 pub use use_prepared_state_macro as use_prepared_state;
 // With SSR.
 #[doc(hidden)]

packages/yew/src/functional/hooks/use_transitive_state/mod.rs

@@ -55,7 +55,6 @@ pub use feat_ssr::*;
 /// You MUST denote the return type of the closure with `|deps| -> ReturnType { ... }`. This
 /// type is used during client side rendering to deserialize the state prepared on the server
 /// side.
-#[cfg_attr(documenting, doc(cfg(any(target_arch = "wasm32", feature = "tokio"))))]
 pub use use_transitive_state_macro as use_transitive_state;
 // With SSR.
 #[doc(hidden)]

packages/yew/src/functional/mod.rs

@@ -27,7 +27,6 @@ use std::rc::Rc;
 
 use wasm_bindgen::prelude::*;
 
-#[cfg(any(target_arch = "wasm32", feature = "tokio"))]
 #[cfg(all(feature = "hydration", feature = "ssr"))]
 use crate::html::RenderMode;
 use crate::html::{AnyScope, BaseComponent, Context, HtmlResult};
@@ -68,7 +67,6 @@ pub use yew_macro::hook;
 type ReRender = Rc<dyn Fn()>;
 
 /// Primitives of a prepared state hook.
-#[cfg(any(target_arch = "wasm32", feature = "tokio"))]
 #[cfg(any(feature = "hydration", feature = "ssr"))]
 pub(crate) trait PreparedState {
     #[cfg(feature = "ssr")]
@@ -83,22 +81,18 @@ pub(crate) trait Effect {
 /// A hook context to be passed to hooks.
 pub struct HookContext {
     pub(crate) scope: AnyScope,
-    #[cfg(any(target_arch = "wasm32", feature = "tokio"))]
     #[cfg(all(feature = "hydration", feature = "ssr"))]
     creation_mode: RenderMode,
     re_render: ReRender,
 
     states: Vec<Rc<dyn Any>>,
     effects: Vec<Rc<dyn Effect>>,
 
-    #[cfg(any(target_arch = "wasm32", feature = "tokio"))]
     #[cfg(any(feature = "hydration", feature = "ssr"))]
     prepared_states: Vec<Rc<dyn PreparedState>>,
 
-    #[cfg(any(target_arch = "wasm32", feature = "tokio"))]
     #[cfg(feature = "hydration")]
     prepared_states_data: Vec<Rc<str>>,
-    #[cfg(any(target_arch = "wasm32", feature = "tokio"))]
     #[cfg(feature = "hydration")]
     prepared_state_counter: usize,
 
@@ -111,37 +105,29 @@ impl HookContext {
     fn new(
         scope: AnyScope,
         re_render: ReRender,
-        #[cfg(any(target_arch = "wasm32", feature = "tokio"))]
-        #[cfg(all(feature = "hydration", feature = "ssr"))]
-        creation_mode: RenderMode,
-        #[cfg(any(target_arch = "wasm32", feature = "tokio"))]
-        #[cfg(feature = "hydration")]
-        prepared_state: Option<&str>,
+        #[cfg(all(feature = "hydration", feature = "ssr"))] creation_mode: RenderMode,
+        #[cfg(feature = "hydration")] prepared_state: Option<&str>,
     ) -> RefCell<Self> {
         RefCell::new(HookContext {
             scope,
             re_render,
 
-            #[cfg(any(target_arch = "wasm32", feature = "tokio"))]
             #[cfg(all(feature = "hydration", feature = "ssr"))]
             creation_mode,
 
             states: Vec::new(),
 
-            #[cfg(any(target_arch = "wasm32", feature = "tokio"))]
             #[cfg(any(feature = "hydration", feature = "ssr"))]
             prepared_states: Vec::new(),
             effects: Vec::new(),
 
-            #[cfg(any(target_arch = "wasm32", feature = "tokio"))]
             #[cfg(feature = "hydration")]
             prepared_states_data: {
                 match prepared_state {
                     Some(m) => m.split(',').map(Rc::from).collect(),
                     None => Vec::new(),
                 }
             },
-            #[cfg(any(target_arch = "wasm32", feature = "tokio"))]
             #[cfg(feature = "hydration")]
             prepared_state_counter: 0,
 
@@ -187,7 +173,6 @@ impl HookContext {
         t
     }
 
-    #[cfg(any(target_arch = "wasm32", feature = "tokio"))]
     #[cfg(any(feature = "hydration", feature = "ssr"))]
     pub(crate) fn next_prepared_state<T>(
         &mut self,
@@ -220,7 +205,6 @@ impl HookContext {
 
     #[inline(always)]
     fn prepare_run(&mut self) {
-        #[cfg(any(target_arch = "wasm32", feature = "tokio"))]
         #[cfg(feature = "hydration")]
         {
             self.prepared_state_counter = 0;
@@ -277,15 +261,11 @@ impl HookContext {
         }
     }
 
-    #[cfg(any(
-        not(feature = "ssr"),
-        not(any(target_arch = "wasm32", feature = "tokio"))
-    ))]
+    #[cfg(not(feature = "ssr"))]
     fn prepare_state(&self) -> Option<String> {
         None
     }
 
-    #[cfg(any(target_arch = "wasm32", feature = "tokio"))]
     #[cfg(feature = "ssr")]
     fn prepare_state(&self) -> Option<String> {
         if self.prepared_states.is_empty() {
@@ -361,10 +341,8 @@ where
             hook_ctx: HookContext::new(
                 scope,
                 re_render,
-                #[cfg(any(target_arch = "wasm32", feature = "tokio"))]
                 #[cfg(all(feature = "hydration", feature = "ssr"))]
                 ctx.creation_mode(),
-                #[cfg(any(target_arch = "wasm32", feature = "tokio"))]
                 #[cfg(feature = "hydration")]
                 ctx.prepared_state(),
             ),

packages/yew/src/html/component/scope.rs

@@ -609,7 +609,6 @@ mod feat_csr {
 #[cfg(feature = "csr")]
 pub(crate) use feat_csr::*;
 
-#[cfg_attr(documenting, doc(cfg(feature = "hydration")))]
 #[cfg(feature = "hydration")]
 mod feat_hydration {
     use wasm_bindgen::JsCast;

packages/yew/src/lib.rs

@@ -1,6 +1,7 @@
 #![allow(clippy::needless_doctest_main)]
 #![doc(html_logo_url = "https://yew.rs/img/logo.png")]
 #![cfg_attr(documenting, feature(doc_cfg))]
+#![cfg_attr(documenting, feature(doc_auto_cfg))]
 #![cfg_attr(
     feature = "nightly",
     feature(fn_traits, async_closure, unboxed_closures)

packages/yew/src/renderer.rs

@@ -14,7 +14,7 @@ thread_local! {
 /// Set a custom panic hook.
 /// Unless a panic hook is set through this function, Yew will
 /// overwrite any existing panic hook when an application is rendered with [Renderer].
-#[cfg_attr(documenting, doc(cfg(feature = "csr")))]
+#[cfg(feature = "csr")]
 pub fn set_custom_panic_hook(hook: Box<dyn Fn(&PanicInfo<'_>) + Sync + Send + 'static>) {
     std::panic::set_hook(hook);
     PANIC_HOOK_IS_SET.with(|hook_is_set| hook_is_set.set(true));
@@ -29,7 +29,7 @@ fn set_default_panic_hook() {
 /// The Yew Renderer.
 ///
 /// This is the main entry point of a Yew application.
-#[cfg_attr(documenting, doc(cfg(feature = "csr")))]
+#[cfg(feature = "csr")]
 #[derive(Debug)]
 #[must_use = "Renderer does nothing unless render() is called."]
 pub struct Renderer<COMP>
@@ -93,7 +93,6 @@ where
     }
 }
 
-#[cfg_attr(documenting, doc(cfg(feature = "hydration")))]
 #[cfg(feature = "hydration")]
 mod feat_hydration {
     use super::*;

packages/yew/src/server_renderer.rs

@@ -7,7 +7,7 @@ use crate::platform::io::{self, DEFAULT_BUF_SIZE};
 use crate::platform::{run_pinned, spawn_local};
 
 /// A Yew Server-side Renderer that renders on the current thread.
-#[cfg_attr(documenting, doc(cfg(feature = "ssr")))]
+#[cfg(feature = "ssr")]
 #[derive(Debug)]
 pub struct LocalServerRenderer<COMP>
 where
@@ -112,7 +112,7 @@ where
 /// the rendering process has finished.
 ///
 /// See [`yew::platform`] for more information.
-#[cfg_attr(documenting, doc(cfg(feature = "ssr")))]
+#[cfg(feature = "ssr")]
 pub struct ServerRenderer<COMP>
 where
     COMP: BaseComponent,