index.js

const chunk = require("lodash.chunk");
const fs = require("fs");
const parse = require("csv-parse/lib/sync");
const PDFDocument = require("pdfkit");

const pdfDPI = 72;
const badgeHeight = 2.5;
const badgeWidth = 4.1;

const paperHeight = 11;
const paperWidth = 8.5;

const pdfHeight = paperHeight * pdfDPI;
const pdfWidth = paperWidth * pdfDPI;

const badgeRowsPerPage = 4;
const badgesPerRow = 2;
const barHeight = 30;
const extraPageHorizontalMargin =
  ((paperWidth - badgeWidth * badgesPerRow) * pdfDPI) / 2;
const extraPageVerticalMargin =
  ((paperHeight - badgeHeight * badgeRowsPerPage) * pdfDPI) / 2;

const doc = new PDFDocument({ autoFirstPage: false });
doc.pipe(fs.createWriteStream("badges.pdf"));

const attendees = parse(fs.readFileSync("data.csv", "utf8"), { columns: true });
const blankBadges = new Array(20).fill({
  Team: "",
  "First Name": "",
  "Last Name": ""
});

const attendeesByPage = chunk(attendees.concat(blankBadges), badgeRowsPerPage);

attendeesByPage.forEach(attendees => {
  renderPage(attendees);
});

doc.end();

function fontSizeForString(string) {
  if (string.length > 12) {
    return 21;
  }
  if (string.length > 9) {
    return 23;
  }
  return 28;
}

function renderBadge(x, y, attendee) {
  doc.image("givecamp-logo.png", x + badgeWidth * pdfDPI - 90, y + 10, {
    width: 80
  });

  if (!attendee) {
    return;
  }

  doc
    .fillColor("black")
    .font("Helvetica-Bold")
    .fontSize(fontSizeForString(attendee["First Name"]))
    .text(attendee["First Name"].toUpperCase(), x + 10, y + 55, {
      align: "left",
      ellipsis: true,
      height: 10,
      indent: 0,
      width: badgeWidth * pdfDPI - 20
    })
    .font("Helvetica-Bold")
    .fontSize(fontSizeForString(attendee["Last Name"]))
    .text(attendee["Last Name"].toUpperCase(), {
      align: "left",
      ellipsis: true,
      height: 10,
      indent: 0,
      width: badgeWidth * pdfDPI - 20
    })
    .font("Helvetica")
    .fontSize(20)
    .fillColor("white")
    .text(attendee.Team, x, y + 157, {
      align: "center",
      ellipsis: true,
      height: 10,
      indent: 0,
      width: badgeWidth * pdfDPI - 10
    });
}

function renderPage(attendees) {
  doc.addPage();

  for (let i = 0; i < badgeRowsPerPage; i++) {
    const badgeY = extraPageVerticalMargin + i * badgeHeight * pdfDPI;

    doc
      .rect(
        extraPageHorizontalMargin,
        badgeY + badgeHeight * pdfDPI - barHeight,
        pdfWidth - extraPageHorizontalMargin * 2,
        barHeight
      )
      .fill("#00689d");

    if (attendees[i]) {
      renderBadge(extraPageHorizontalMargin, badgeY, attendees[i]);
      renderBadge(
        extraPageHorizontalMargin + badgeWidth * pdfDPI,
        badgeY,
        attendees[i]
      );
    }
  }
}