Fill Word template

import * as wmill from "windmill-client"

import { S3Object } from "windmill-client"

import Docxtemplater from "docxtemplater"

import PizZip from "pizzip"

/**

 * Fill Word template

 * Fill a .docx template from Windmill object storage with `data` and write the result back to object storage, returning its S3 reference. The template uses docxtemplater tags: `{name}` for a value, `{#items}...{/items}` to repeat a block per array element or show it when truthy, `{^items}...{/items}` when empty. A tag with no matching key is left blank. Needs no Microsoft connection and works with any workspace object storage; for a PDF, upload the result with the OneDrive Upload File script and download it with `convert_to_pdf`.

 */

export async function main(

  template: S3Object,

  data: { [key: string]: any },

  destination: S3Object

) {

  const bytes = await wmill.loadS3File(template)

  if (!bytes) throw new Error("template not found in object storage")

  const doc = new Docxtemplater(new PizZip(bytes), {

    paragraphLoop: true,

    linebreaks: true,

    nullGetter: () => "",

  })

  doc.render(data)

  await wmill.writeS3File(

    destination,

    new Blob([doc.getZip().generate({ type: "uint8array" })])

  )

  return destination

}