add single-page pdf export

sites/shared/components/workbench/exporting/single-pdf-maker.mjs

@@ -0,0 +1,23 @@
+import { Pdf, mmToPoints } from './pdf.mjs'
+import SVGtoPDF from 'svg-to-pdfkit'
+
+/**
+ * Basic exporter for a single-page pdf containing the rendered pattern.
+ * This generates a PDF that is the size of the pattern and has no additional frills*/
+export class SinglePdfMaker {
+  pdf
+  svg
+
+  constructor({ svg, pageSettings }) {
+    this.pdf = Pdf({ size: pageSettings.size.map((s) => s * mmToPoints) })
+    this.svg = svg
+  }
+
+  async makePdf() {
+    await SVGtoPDF(this.pdf, this.svg)
+  }
+
+  async toBlob() {
+    return this.pdf.toBlob()
+  }
+}