Add landing page for kjol, documentation

2026-07-13 16:51:21 -04:00
parent 5230bd6702
commit fec8ef4a3e
54 changed files with 3529 additions and 547 deletions
--- a/go/wasmruntime/host_wasm.go
+++ b/go/wasmruntime/host_wasm.go
@@ -67,8 +67,63 @@ func CSSVarPx(name string) float64 {
 	return parseCSSLength(raw, style.Get("fontSize").String())
 }

+// ---- theme ----
+
+// PrefersDark reports whether the OS asks for a dark colour scheme.
+func PrefersDark() bool {
+	mq := window.Call("matchMedia", "(prefers-color-scheme: dark)")
+	return mq.Truthy() && mq.Get("matches").Bool()
+}
+
+// OnMediaChange watches a media query. The theme controller uses it to follow the OS
+// while the user has not overridden it — a preference changed in the system settings
+// should reach an open tab, not wait for a reload.
+func OnMediaChange(query string, fn func(matches bool)) Unsub {
+	mq := window.Call("matchMedia", query)
+	if !mq.Truthy() {
+		return func() {}
+	}
+	cb := js.FuncOf(func(_ js.Value, args []js.Value) any {
+		matches := false
+		if len(args) > 0 {
+			matches = args[0].Get("matches").Bool()
+		}
+		fn(matches)
+		return nil
+	})
+	mq.Call("addEventListener", "change", cb)
+	return func() {
+		mq.Call("removeEventListener", "change", cb)
+		cb.Release()
+	}
+}
+
+// SetRootClass adds or removes a class on <html>.
+//
+// The THEME lives there rather than on the app's root element because the page's own
+// background — the thing behind everything, painted before the app mounts — is styled
+// from <html>. A dark class on #app leaves a white margin around a dark page.
+func SetRootClass(class string, on bool) {
+	list := document.Get("documentElement").Get("classList")
+	if on {
+		list.Call("add", class)
+		return
+	}
+	list.Call("remove", class)
+}
+
 // ---- frame timing + the post-render hook ----

+// Now is performance.now(): milliseconds since the page began navigating, with
+// sub-millisecond resolution.
+//
+// It is measured from the same origin the browser uses for its own timings, so a
+// reading taken when the first render commits IS the time it took this app to become
+// interactive — not an interval the app started and stopped itself.
+func Now() float64 {
+	return window.Get("performance").Call("now").Float()
+}
+
 func RAF(fn func()) int {
 	var cb js.Func
 	cb = js.FuncOf(func(js.Value, []js.Value) any {