feat: made web_log! cross-platform and only needing perseus

Before, it only worked in the browser, and needed `wasm_bindgen` and
`web_sys` as dependencies of the user's crate. Now, it's entirely
self-contained, and will use the logging function appropriate to its platform!

Author: arctic-hen7

examples/basic/src/templates/index.rs

@@ -13,6 +13,7 @@ pub struct IndexPageProps {
 #[perseus::template(IndexPage)]
 #[component(IndexPage<G>)]
 pub fn index_page(props: IndexPageProps) -> View<G> {
+    perseus::web_log!("Cross-platform logging!");
     view! {
         p {(props.greeting)}
         a(href = "about", id = "about-link") { "About!" }

packages/perseus/src/lib.rs

@@ -135,4 +135,9 @@ pub mod internal {
         pub use crate::export::*;
     }
     pub use crate::path_prefix::{get_path_prefix_client, get_path_prefix_server};
+    /// Internal utilities for logging. These are just re-exports so that users don't have to have `web_sys` and `wasm_bindgen` to use `web_log!`.
+    pub mod log {
+        pub use wasm_bindgen::JsValue;
+        pub use web_sys::console::log_1 as log_js_value;
+    }
 }

packages/perseus/src/log.rs

@@ -1,11 +1,21 @@
-/// Logs the given `format!`-style data to the browser's console.
+/// Logs the given `format!`-style data to the browser's console, or to stdout as usual on the server.
 #[macro_export]
+#[cfg(target_arch = "wasm32")]
 macro_rules! web_log {
     ($format_str:literal $(, $data:expr)*) => {
-        ::web_sys::console::log_1(
-            &::wasm_bindgen::JsValue::from(
+        $crate::internal::log::log_js_value(
+            &$crate::internal::log::JsValue::from(
                 format!($format_str $(, $data)*)
             )
         );
     };
 }
+
+/// Logs the given `format!`-style data to the browser's console, or to stdout on the server.
+#[macro_export]
+#[cfg(not(target_arch = "wasm32"))]
+macro_rules! web_log {
+    ($format_str:literal $(, $data:expr)*) => {
+        println!($format_str, $(, $data)*)
+    };
+}