1 files changed, 58 insertions, 0 deletions
diff --git a/src/features/markdown/ui/Markdown.svelte b/src/features/markdown/ui/Markdown.svelte
new file mode 100644
index 0000000..b828ab9
--- /dev/null
+++ b/src/features/markdown/ui/Markdown.svelte
@@ -0,0 +1,58 @@
+<script lang="ts">
+	import { renderMarkdown } from "../logic/markdown";
+
+	let {
+		text,
+		streaming = false,
+	}: {
+		text: string;
+		/** Balance dangling delimiters while the message is still generating. */
+		streaming?: boolean;
+	} = $props();
+
+	// Pure transform; the HTML is already DOMPurify-sanitized in renderMarkdown.
+	const html = $derived(renderMarkdown(text, { streaming }));
+
+	let container: HTMLElement;
+
+	// One delegated listener on the stable container handles every code block's
+	// copy button — including blocks re-created when `html` changes (streaming),
+	// since the listener lives on the container, not the buttons. Clipboard is the
+	// edge effect; absent (insecure context) → no-op.
+	$effect(() => {
+		const el = container;
+		if (el === undefined) return;
+
+		const onClick = (event: Event): void => {
+			const target = event.target;
+			if (!(target instanceof Element)) return;
+			const button = target.closest<HTMLButtonElement>("[data-copy]");
+			if (button === null) return;
+
+			const code = button.closest(".code-block")?.querySelector("code")?.textContent ?? "";
+			const clipboard = navigator.clipboard;
+			if (clipboard === undefined) return;
+
+			void clipboard
+				.writeText(code)
+				.then(() => {
+					const prev = button.textContent;
+					button.textContent = "Copied";
+					setTimeout(() => {
+						button.textContent = prev;
+					}, 1200);
+				})
+				.catch(() => {
+					// Clipboard denied — leave the button as-is.
+				});
+		};
+
+		el.addEventListener("click", onClick);
+		return () => el.removeEventListener("click", onClick);
+	});
+</script>
+
+<div class="markdown-body" bind:this={container}>
+	<!-- {@html} is safe here: `html` is DOMPurify-sanitized inside renderMarkdown. -->
+	{@html html}
+</div>