decatur’s gists

decatur / who_is_talking.html

Last active November 10, 2025 11:50

Keeps monitoring talking time.

	<!DOCTYPE html>
	<html>
	<head>
	<style>
	.time { padding: 1em }
	/* https://developer.mozilla.org/de/docs/Web/CSS/Reference/Values/system-color */
	.current { background-color: ActiveText !important; }
	.speaker { margin: 1ex; padding: 1em; background-color: ButtonFace; }
	</style>
	</head>

decatur / thread_as_task_or_service.rs

Created November 4, 2025 00:11

Threads can have task xor service semantics

	use std::sync::mpsc::{Sender, Receiver};
	use std::sync::mpsc;
	use rayon::prelude::*;

	fn main() {
	let (tx, rx): (Sender<u8>, Receiver<u8>) = mpsc::channel();
	// Thread as an event loop (service)
	// Long lived
	// May use messaging and shared state
	std::thread::spawn(move \|\| {

decatur / presentation.typ

Last active October 16, 2025 22:54

typst presentation

	#set page("presentation-4-3",
	header: [#text("From MPA to SPA and Back", size: 12pt)],
	margin: (top: 2cm, left: 3cm,)
	)

	#show heading: it => [
	#set text(font: "Inria Serif")
	#pagebreak()
	#text(it.body)
	#linebreak()

decatur / template_engine.rs

Last active September 26, 2025 15:16

Rust minimal template engine

	/// Minimal template string substitution in 60 lines of code.
	/// * No dependencies
	/// * Single pass
	///
	/// Possible improvements: Write more tests.

	#[cfg(test)]
	mod tests {
	use crate::fill_template;
	use std::collections::HashMap;

decatur / iso8601.rs

Last active May 6, 2025 05:27

Parse ISO8601 date/times and validates against the proleptic Gregorian calendar with no dependencies and no_std compliant.

	// Parse ISO8601 date/times and validates against the proleptic Gregorian calendar with no dependencies and no_std compliant.
	//
	// If you want to convert a parsed date into a unix timestamp, I recommend [tz-rs="0.7.0"](https://docs.rs/tz-rs/0.7.0) , which also has no dependencies.
	//
	// See also
	// * https://docs.rs/iso8601/0.6.2/iso8601/
	// * https://github.com/BurntSushi/jiff

	/// Parses ISO8601 dates and validates against the proleptic Gregorian calendar.
	/// Usage:

decatur / why_getter_costs.rs

Last active January 2, 2025 14:57

With Rust we do not just use Getters and Setters.

	// Do not use Getter/Setter without immediate benefits, see also https://news.ycombinator.com/item?id=42506984
	// There are costs for abstraction and indirection.
	// And in Rust, there is the borrow checker!

	#[derive(Default)]
	struct Strategy {
	throughput: f64,
	position: Vec<f64>,
	}

decatur / DeliveryTime.py

Last active November 19, 2024 09:47

DeliveryTime is a point in time Python abstraction aligned to a 1/4hour grid. TransactionTime is a point in time abstraction

	from __future__ import annotations
	from datetime import datetime, timedelta, time, tzinfo
	from dateutil import tz

	BERLIN = tz.gettz('Europe/Berlin')

	class DeliveryTime:
	"""
	DeliveryTime is a point in time abstraction aligned to a ¼hour grid and
	optimized for arithmetic operations.

decatur / schema_evolution.rs

Last active September 6, 2024 09:08

Demonstrate Schema Evolution

	//! # Demonstrate Schema Evolution in Rust
	//! A structure must deserialized from several, possibly persistent, variants.
	//!
	//! ┌────────────────────────────────────────────┐
	//! │ MyStruct │
	//! └────────────────────────────────────────────┘
	//! ▲ ▲ ▲ │
	//! from from from into
	//! │ │ │ ▼
	//! ┌───────┐ ┌───────┐ ┌───────┐

decatur / enum_container.rs

Created September 11, 2023 12:59

Example of a container using enum

	/// https://play.rust-lang.org/?version=stable&mode=debug&edition=2021&gist=35d62d49d15756d1116d620099f324ae
	/// Example of a container using enum.

	use std::collections::HashMap;
	use serde::Serialize;

	#[derive(Debug, Serialize)]
	struct PlantA {
	id: String,
	}

decatur / object_safe.rs

Created September 11, 2023 12:56

trait is not object safe

	#[derive(Clone)]
	struct S;

	fn main() {
	let s
	// Uncomment this line to provoke an "trait is not object safe" error
	: Box<dyn Clone>
	= Box::new(S);
	let _ = s.clone();
	}

wolfgang kuehn decatur