Simon Willison simonw

How I got a Yubikey working with a Dvorak keyboard and Karabiner-Elements

I needed to set up a new Yubikey device, which plugs into my Mac laptop via USB-C and injects one-time codes by pretending to be a keyboard.

Problem: I use Dvorak... so the Yubikey codes were coming through incorrectly and failing to work.

https://superuser.do/2014/10/22/yubikey-support-for-non-qwerty-keyboard-layouts-on-mac-os-x/ has a recipe for fixing this using Karabiner. But... those instructions are for an older Karabiner which is configured using XML files.

The latest Karabiner - Karabiner-Elements - uses a JSON configuration instead.

How to update an existing vega view with new fetched data

This took quite a bit of figuring out because the web is littered with Vega 2 examples but Vega 3 is a bit different.

https://vega.github.io/vega/docs/api/view/#view_change

var spec = {
  data: {"url": "https://fivethirtyeight.datasettes.com/fivethirtyeight-45d758d/most-common-name%2Fsurnames.json?_shape=array"},
  mark: "bar",

Installing hackable Python packages

This is a handy recipe for installing a Python package in a way that makes it easy to modify locally:

Assuming you have a virtualenv in venv/:

source venv/bin/activate
pip install -e git+git@github.com:simonw/datasette-cluster-map#egg=datasette-cluster-map

This will install code from that GitHub repository in the venv/src/ folder and set it up so changes you make there will be visible to other code in that virtual environment.

Notes on using rbenv to install a gem application without needing root

I don't like running sudo gem install X - here's how I installed a gem packaged app without it.

Install rbenv using homebrew

brew install rbenv

Download Ruby 2.5.1 using it

Really basic load test

I ran Apache Bench like so:

ab -n 1000 -c 100 'http://127.0.0.1:8000/'

uvicorn

Server Software:        uvicorn
Server Hostname: 127.0.0.1

	FROM alpine:edge

	RUN apk add --update \
	python3 \
	python3-dev \
	build-base \
	&& python3 -m ensurepip \
	&& rm -r /usr/lib/python*/ensurepip \
	&& pip3 install --upgrade pip setuptools \
	&& pip3 install starlette uvicorn \

	import click
	import sqlite3
	import dateparser

	count = 0

	c = sqlite3.connect("tweets.db")

	with click.progressbar(
	length=c.execute("select count(*) from tweets").fetchone()[0],

	{
	"data": {
	"url": "https://fivethirtyeight.datasettes.com/fivethirtyeight/twitter-ratio%2Fsenators.csv?_size=max&_sort_desc=replies",
	"format": {
	"type": "csv"
	}
	},
	"mark": "bar",
	"encoding": {
	"x": {