feat: a pretty decent, tested, working SDK + CLI

[crowdnode.js/.git] / lib / qr.js

diff --git a/lib/qr.js b/lib/qr.js
new file mode 100644 (file)
index 0000000..059ba55
--- /dev/null
+++ b/lib/qr.js
@@ -0,0 +1,49 @@
+"use strict";
+
+let Qr = module.exports;
+
+let Fs = require("fs").promises;
+
+let QrCode = require("qrcode-svg");
+
+Qr._create = function (data, opts) {
+  return new QrCode({
+    content: data,
+    padding: opts?.padding || 4,
+    width: opts?.width || 256,
+    height: opts?.height || 256,
+    color: opts?.color || "#000000",
+    background: opts?.background || "#ffffff",
+    ecl: opts?.ecl || "M",
+  });
+};
+
+Qr.ascii = function (data, opts) {
+  let qrcode = Qr._create(data, opts);
+  let indent = opts?.indent ?? 4;
+  var modules = qrcode.qrcode.modules;
+
+  let ascii = ``.padStart(indent - 1, ' ');
+  let length = modules.length;
+  for (let y = 0; y < length; y += 1) {
+    for (let x = 0; x < length; x += 1) {
+      let block = "  ";
+      if (modules[x][y]) {
+        block = "██";
+      }
+      ascii += block;
+    }
+    ascii += `\n`.padEnd(indent, ' ');
+  }
+  return ascii;
+};
+
+Qr.svg = function (data, opts) {
+  let qrcode = Qr._create(data, opts);
+  return qrcode.svg();
+};
+
+Qr.save = async function (filepath, data, opts) {
+  let qrcode = Qr.svg(data, opts);
+  await Fs.writeFile(filepath, qrcode, "utf8");
+};