Ship file viewer, editor improvements, and private package releases

packages/viewer/src/text.ts

@@ -0,0 +1,66 @@
+import { setButtonLabel } from "./renderers/dom.ts";
+import { convertUrl, converterFormats } from "./convert/client.ts";
+import { extensionOf } from "./kinds.ts";
+import { readBounded } from "./source.ts";
+import type { ViewerSource } from "./types.ts";
+
+/** Bounded plain text for search/indexing consumers; the server rechecks source access. */
+export async function extractText(
+  source: ViewerSource,
+  options: { baseURI?: string; signal?: AbortSignal; fetch?: typeof fetch } = {},
+): Promise<string> {
+  const url = convertUrl(source, "text", options.baseURI);
+  if (!url) throw new Error("Text extraction needs a URL");
+  const response = await (options.fetch ?? fetch)(url, { signal: options.signal });
+  if (!response.headers.get("content-type")?.startsWith("text/plain")) {
+    await response.body?.cancel();
+    throw new Error("Text extraction unavailable");
+  }
+  return new TextDecoder().decode(await readBounded(response, 2 * 1024 * 1024));
+}
+
+export function mountExtractedText(
+  parent: HTMLElement,
+  source: ViewerSource,
+  signal: AbortSignal,
+): () => void {
+  const doc = parent.ownerDocument;
+  const button = doc.createElement("button");
+  button.type = "button";
+  button.className = "wrn-viewer-action";
+  setButtonLabel(button, "Extract text");
+  const details = doc.createElement("details");
+  const summary = doc.createElement("summary");
+  summary.textContent = "Extracted text";
+  const text = doc.createElement("pre");
+  details.append(summary, text);
+  let disposed = false;
+  void converterFormats({ baseURI: doc.baseURI })
+    .then((formats) => {
+      if (!disposed && source.src && formats[extensionOf(source.name)]) parent.append(button);
+    })
+    .catch(() => {});
+  button.onclick = async () => {
+    button.disabled = true;
+    try {
+      const result = await extractText(source, { baseURI: doc.baseURI, signal });
+      if (disposed) return;
+      text.textContent = result || "No text was found.";
+      details.open = true;
+      parent.append(details);
+    } catch {
+      if (!disposed) {
+        text.textContent = "Text extraction is unavailable.";
+        details.open = true;
+        parent.append(details);
+      }
+    } finally {
+      if (!disposed) button.disabled = false;
+    }
+  };
+  return () => {
+    disposed = true;
+    button.remove();
+    details.remove();
+  };
+}