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   "source": [
    "# QR Codes Are Magic\n",
    "While really ugly, QR codes are robust and widely implemented. Like JSON.     "
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "    pip install qrcode\n",
    "    "
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "    conda install -c conda-forge qrcode"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 16,
   "metadata": {},
   "outputs": [],
   "source": [
    "    import qrcode as qrcode, qrcode.image.svg, IPython; get_ipython = IPython.get_ipython\n",
    "    Ø = __name__ == '__main__'"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "    \n",
    "and you can make QR codes out of arbitrary data which can be read by most cell phones.\n",
    "\n",
    "Here's a magic which gives you all kinds of toys to play with."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 17,
   "metadata": {},
   "outputs": [],
   "source": [
    "    @IPython.core.magic.register_line_cell_magic\n",
    "    def qr(line, cell=None):\n",
    "        line = (line + \" \" + (cell or \"\")).strip()\n",
    "        args = parser.parse_args(line.split())\n",
    "        q = qrcode.QRCode(version=args.version, error_correction=args.error_correction,\n",
    "                          box_size=args.size, border=args.border, mask_pattern=args.mask,)\n",
    "        q.add_data(args.data), q.make(fit=True)\n",
    "        \n",
    "        img = None\n",
    "        if args.output == \"png\":\n",
    "            img = q.make_image(fill_color=args.fg, back_color=args.bg)\n",
    "        elif \"svg\" in args.output:\n",
    "            with __import__('io').BytesIO() as out:\n",
    "                q.make_image(fill_color=args.fg, back_color=args.bg, image_factory={\n",
    "                    \"svg\": qrcode.image.svg.SvgImage,\n",
    "                    \"svg-fragment\": qrcode.image.svg.SvgFragmentImage,\n",
    "                    \"svg-path\": qrcode.image.svg.SvgPathImage,\n",
    "                }[args.output])._write(out)\n",
    "                img = IPython.display.SVG(out.getvalue())\n",
    "        elif args.output == \"ascii\":\n",
    "            with IPython.utils.capture.capture_output() as cap: q.print_ascii()\n",
    "\n",
    "            img = IPython.display.HTML(f\"\"\"<pre style=\"line-height: 1;\">\\n{cap.stdout}\\n</pre>\"\"\")\n",
    "        IPython.display.display(img)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "`qrcode` hides it's parser inside a closure, so let's make another one."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 18,
   "metadata": {},
   "outputs": [],
   "source": [
    "    parser = __import__('argparse').ArgumentParser()\n",
    "    parser.add_argument('data')\n",
    "    parser.add_argument('-s', '--size', default=10, type=int)\n",
    "    parser.add_argument('-b', '--border', default=1, type=int)\n",
    "    parser.add_argument('-e', '--error-correction', default=1, type=int)\n",
    "    parser.add_argument('-v', '--version', default=1)\n",
    "    parser.add_argument('--fg', default='black')\n",
    "    parser.add_argument('--bg', default='white')\n",
    "    parser.add_argument('-m', '--mask', default=None, type=int)\n",
    "    parser.add_argument('-o', '--output', default='png', choices=['svg', 'svg-path', 'svg-fragment', 'png', 'ascii']);"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Outputs"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### SVG output"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 19,
   "metadata": {},
   "outputs": [],
   "source": [
    "    def _jupyter_qr():\n",
    "        %qr -o svg-path https://jupyter.org\n",
    "    "
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Plain Text\n",
    "\n",
    "A plain text QR to post on your In addition to images, you can generate plain text, which would look great on your BBS!"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 20,
   "metadata": {},
   "outputs": [],
   "source": [
    "    def _pydata_qr():\n",
    "        %qr -o ascii https://pydata.org"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Edit your own QR code with an IPython widget."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 21,
   "metadata": {},
   "outputs": [],
   "source": [
    "    from ipywidgets import interact, ColorPicker\n",
    "    def deathbeds(url=\"https://deathbeds.github.io\", size=(1,10), mask=(0,7), error=(0,3), version=(1,8), border=(0, 10), fore=ColorPicker(value=\"#0f0\"), back=ColorPicker(value=\"black\")):\n",
    "        %qr -s{size} -m{mask} -e{error} -v{version} -b{border} --fg {fore} --bg {back} {url}\n",
    "        \n",
    "    def _interactive_editor(): interact(deathbeds)"
   ]
  }
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