feat: reader mode

quartz/components/scripts/readermode.inline.ts

@@ -0,0 +1,25 @@
+let isReaderMode = false
+
+const emitReaderModeChangeEvent = (mode: "on" | "off") => {
+  const event: CustomEventMap["readermodechange"] = new CustomEvent("readermodechange", {
+    detail: { mode },
+  })
+  document.dispatchEvent(event)
+}
+
+document.addEventListener("nav", () => {
+  const switchReaderMode = () => {
+    isReaderMode = !isReaderMode
+    const newMode = isReaderMode ? "on" : "off"
+    document.documentElement.setAttribute("reader-mode", newMode)
+    emitReaderModeChangeEvent(newMode)
+  }
+
+  for (const readerModeButton of document.getElementsByClassName("readermode")) {
+    readerModeButton.addEventListener("click", switchReaderMode)
+    window.addCleanup(() => readerModeButton.removeEventListener("click", switchReaderMode))
+  }
+
+  // Set initial state
+  document.documentElement.setAttribute("reader-mode", isReaderMode ? "on" : "off")
+})