Steffen Gransow graste

Git Subtree Basics

If you hate git submodule, then you may want to give git subtree a try.

Background

When you want to use a subtree, you add the subtree to an existing repository where the subtree is a reference to another repository url and branch/tag. This add command adds all the code and files into the main repository locally; it's not just a reference to a remote repo.

When you stage and commit files for the main repo, it will add all of the remote files in the same operation. The subtree checkout will pull all the files in one pass, so there is no need to try and connect to another repo to get the portion of subtree files, because they were already included in the main repo.

Adding a subtree

Let's say you already have a git repository with at least one commit. You can add another repository into this respository like this:

Falsehoods programmers believe about time

This is a compiled list of falsehoods programmers tend to believe about working with time.

Don't re-invent a date time library yourself. If you think you understand everything about time, you're probably doing it wrong.

Falsehoods

There are always 24 hours in a day.
February is always 28 days long.
Any 24-hour period will always begin and end in the same day (or week, or month).

Get WGS84-GeoJSON from WFS with Soldner-Coordinates

The problem: get GeoJSON data from a WFS that uses a projection other than WGS84. This is e.g. true for all geo data in Berlin's FIS-Broker GIS. The data there uses the "Soldner" projection (or EPSG:25833).

Download as XML

You need to know the URL of the WFS you want to get the data from.
Consider Baumbestand Berlin - Straßenbäume - Sachdaten zur Karte - [WFS]:
The URL is https://fbinter.stadt-berlin.de/fb/wfs/data/senstadt/s_wfs_baumbestand.
The last bit of the URL is also the name of the layer: s_wfs_baumbestand.

rechtliches

WCAG

WCAG 2.1 auf Deutsch
Es gibt mittlerweile auch schon die WCAG 2.2
Wirkt sich die WCAG 2.2 aus?
A Roundup Of WCAG 2.2 Explainers
WCAG Cheat Sheets and Checklists

CSS 2024 Reading List

lvh / lvw / lvmin / lvmax, sv, dv, etc.

The CSS data type represents a distance value. Lengths can be used in numerous CSS properties, such as width, height, margin, padding, border-width, font-size, and text-shadow.

https://developer.mozilla.org/en-US/docs/Web/CSS/length
The large, small, and dynamic viewport units https://web.dev/viewport-units/ (web.dev)

Anchor Positioning

Future CSS: Anchor Positioning (kizu.dev)

author: @sleepyfox
title: Fox's laws of software development
date: 27 October 2021
preamble: A not entirely serious treatise on the immutable fundamental laws of software development activities

Fox's laws of software development

A not entirely serious treatise

Raspberry Pi Zero OTG Mode

Simple guide for setting up OTG modes on the Raspberry Pi Zero - By Andrew Mulholland (gbaman).

The Raspberry Pi Zero (and model A and A+) support USB On The Go, given the processor is connected directly to the USB port, unlike on the B, B+ or Pi 2 B, which goes via a USB hub.
Because of this, if setup to, the Pi can act as a USB slave instead, providing virtual serial (a terminal), virtual ethernet, virtual mass storage device (pendrive) or even other virtual devices like HID, MIDI, or act as a virtual webcam!
It is important to note that, although the model A and A+ can support being a USB slave, they are missing the ID pin (is tied to ground internally) so are unable to dynamically switch between USB master/slave mode. As such, they default to USB master mode. There is no easy way to change this right now.
It is also important to note, that a USB to UART serial adapter is not needed for any of these guides, as may be documented elsewhere across the int

	// This will use the single-packet attack for HTTP/2, and last-byte synchronisation for HTTP/1
	int NUMBER_OF_REQUESTS = 10;
	var reqs = new ArrayList<HttpRequest>();
	for (int i = 0; i < NUMBER_OF_REQUESTS; i++) {
	reqs.add(requestResponse.request());
	}

	var responses = api().http().sendRequests(reqs);
	var codes = responses.stream().map(HttpRequestResponse::response).map(HttpResponse::statusCode).toList();
	logging().logToOutput(codes);

	CREATE FUNCTION text_to_timestamp(text) RETURNS TIMESTAMP
	LANGUAGE sql IMMUTABLE AS
	$$
	SELECT CASE
	WHEN $1 ~ '^\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}(\.\d+)?$' THEN
	CAST($1 AS timestamp without time zone)
	END
	$$;

	CREATE TABLE t (

	*,
	::after,
	::before {
	box-sizing: border-box;
	}

	html {
	font-size: 16px;
	}