Add loging implementation for wasm (#56)

Cargo.lock

@@ -70,6 +70,7 @@ version = "0.1.0"
 dependencies = [
  "console_error_panic_hook",
  "graphite-editor-core",
+ "log",
  "wasm-bindgen",
  "wasm-bindgen-test",
 ]

client/web/wasm/Cargo.toml

@@ -19,6 +19,7 @@ default = ["console_error_panic_hook"]
 console_error_panic_hook = { version = "0.1.6", optional = true }
 editor-core = { path = "../../../core/editor", package = "graphite-editor-core" }
 wasm-bindgen = "0.2.72"
+log = "0.4"
 
 [dev-dependencies]
 wasm-bindgen-test = "0.3.22"

client/web/wasm/src/lib.rs

@@ -4,16 +4,20 @@ pub mod utils;
 pub mod window;
 pub mod wrappers;
 
-use editor_core::{events::Response, Callback, Editor};
+use editor_core::{events::Response, Editor};
 use std::cell::RefCell;
+use utils::WasmLog;
 use wasm_bindgen::prelude::*;
 
 // the thread_local macro provides a way to initialize static variables with non-constant functions
 thread_local! { pub static EDITOR_STATE: RefCell<Editor> = RefCell::new(Editor::new(Box::new(handle_response))) }
+static LOGGER: WasmLog = WasmLog;
 
 #[wasm_bindgen(start)]
 pub fn init() {
 	utils::set_panic_hook();
+	log::set_logger(&LOGGER).expect("Failed to set logger");
+	log::set_max_level(log::LevelFilter::Debug);
 }
 
 fn handle_response(response: Response) {

client/web/wasm/src/utils.rs

@@ -1,3 +1,4 @@
+use wasm_bindgen::prelude::*;
 pub fn set_panic_hook() {
 	// When the `console_error_panic_hook` feature is enabled, we can call the
 	// `set_panic_hook` function at least once during initialization, and then
@@ -8,3 +9,37 @@ pub fn set_panic_hook() {
 	#[cfg(feature = "console_error_panic_hook")]
 	console_error_panic_hook::set_once();
 }
+
+#[wasm_bindgen]
+extern "C" {
+	#[wasm_bindgen(js_namespace = console)]
+	fn debug(msg: &str, format: &str);
+	#[wasm_bindgen(js_namespace = console)]
+	fn info(msg: &str, format: &str);
+	#[wasm_bindgen(js_namespace = console)]
+	fn warn(msg: &str, format: &str);
+	#[wasm_bindgen(js_namespace = console)]
+	fn error(msg: &str, format: &str);
+}
+
+#[derive(Default)]
+pub struct WasmLog;
+
+impl log::Log for WasmLog {
+	fn enabled(&self, metadata: &log::Metadata) -> bool {
+		metadata.level() <= log::Level::Info
+	}
+
+	fn log(&self, record: &log::Record) {
+		let (log, name, color): (fn(&str, &str), &str, &str) = match record.level() {
+			log::Level::Trace => (debug, "trace", "color:plum"),
+			log::Level::Debug => (debug, "debug", "color:plum"),
+			log::Level::Warn => (warn, "warn", "color:#1b8"),
+			log::Level::Info => (info, "info", "color:#fa2"),
+			log::Level::Error => (error, "error", "color:red"),
+		};
+		let msg = &format!("{}", format_args!("%c{}%c\t{}", name, record.args()));
+		log(msg, color)
+	}
+	fn flush(&self) {}
+}

core/editor/src/dispatcher/mod.rs

@@ -10,6 +10,7 @@ pub struct Dispatcher {
 
 impl Dispatcher {
 	pub fn handle_event(&self, state: &mut EditorState, event: Event) -> Result<(), EditorError> {
+		log::trace!("{:?}", event);
 		match event {
 			Event::SelectTool(tool_type) => {
 				state.tools.active_tool = tool_type;