Switch to pdfkit like shields.io

package.json

@@ -4,8 +4,8 @@
   "description": "More advanced badges for your projects using Travis or Sauce Labs.",
   "main": "lib/index.js",
   "engines": {
-    "node": "~6.2.0",
-    "npm": "~3.10.0"
+    "node": "6.5.x",
+    "npm": "3.10.x"
   },
   "scripts": {
     "add-font": "./scripts/add-font.sh",
@@ -22,7 +22,6 @@
   "author": "Brian Beck",
   "license": "MIT",
   "dependencies": {
-    "canvas": "^1.3.4",
     "compression": "^1.6.0",
     "express": "^4.13.3",
     "express-interceptor": "^1.1.1",
@@ -32,6 +31,7 @@
     "lru-cache": "^4.0.1",
     "marko": "^3.8.1",
     "object-hash": "^1.1.3",
+    "pdfkit": "^0.8.0",
     "pretty-bytes": "^3.0.0",
     "request": "^2.67.0",
     "svgo": "^0.6.1",

scripts/deploy.sh

@@ -11,10 +11,6 @@ npm run check-font
 # Fail if the `heroku` remote isn't there.
 git remote show heroku
 
-# Combine the Node.js and Cairo buildpacks.
-heroku buildpacks:set https://github.com/mojodna/heroku-buildpack-cairo.git || true
-heroku buildpacks:add heroku/nodejs || true
-
 git stash # Stash uncommitted changes.
 git checkout -B deploy # Force branch creation/reset.
 npm run build

src/text.js

@@ -1,20 +1,18 @@
 import path from "path";
-import Canvas, { Font } from "canvas";
+import PDFDocument from "pdfkit";
 
-// Reference: https://github.com/badges/shields
-const element = new Canvas(0, 0);
-const ctx = element.getContext("2d");
+let doc = new PDFDocument({ size: "A4", layout: "landscape" });
 try {
-  const fontFile = path.join(__dirname, "..", "Verdana.ttf");
-  const font = new Font("Verdana", fontFile);
-  ctx.addFont(font);
-} catch(err) {
-  console.warn(`Failed to add font: ${err}`);
+  doc = doc.font(path.join(__dirname, "..", "Verdana.ttf"));
+} catch (err) {
+  doc = doc.font("Helvetica-Bold");
+  console.warn("Could not load font file 'Verdana.ttf', " +
+               "text widths will therefore be approximate.");
 }
-ctx.font = "11px Verdana, \"DejaVu Sans\"";
+doc = doc.fontSize(11);
 
-export default function measureTextWidth(text) {
-  return ctx.measureText(text).width | 0;
+export default function measureTextWidth(text, rounding = "floor") {
+  return Math[rounding](doc.widthOfString(text));
 }
 
 if (require.main === module) {