justanotherdot’s gists

justanotherdot / box.txt

Last active March 28, 2022 11:41

Box unicode characters for diagrams in documentation, terminals, etc.

justanotherdot / box-example.txt

Last active March 28, 2022 08:12

Box unicode characters.

justanotherdot / print-type-sizes-vec.rs

Last active December 2, 2021 10:38

	#![feature(allocator_api)]

	use std::alloc::Allocator;
	use std::alloc::Global;
	use std::marker::PhantomData;

	// Basicaly a Vec.
	pub struct V<T, A: Allocator = Global> {
	pub buf: Rv<T, A>,
	pub len: usize,

justanotherdot / task-local-with-timeouts.rs

Created March 13, 2021 10:11

	use rand::Rng;
	use std::default::Default;
	use std::{cell::RefCell, collections::HashMap, time::Duration};
	use tokio::{self, select, task, task_local, time::timeout};

	fn rand_gen_millis() -> (u64, u64) {
	let mut rng = rand::thread_rng();
	let t1 = rng.gen_range(0..10);
	let t2 = rng.gen_range(0..10);
	(t1, t2)

justanotherdot / task-local.rs

Created March 13, 2021 08:50

	use tokio;
	use tokio::{task, task_local};
	use std::cell::RefCell;
	use std::collections::HashMap;

	#[tokio::main]
	async fn main() {
	let handler = task::spawn(async {
	task_local! {
	pub static WRITER: RefCell<HashMap<String, i64>>;

justanotherdot / rust-underscore-idiom.rs

Created January 29, 2021 21:16

Avoid prefixing variables you will use with an underscore.

	// Rust Idiom:
	// prefixing a variable with an underscore
	// signals to others that the variable
	// isn't going to be used, not that it is
	// intentionally private or an updated
	// variable.

	main () {
	let x = 12;
	// _x reads as

justanotherdot / sans-clone-derive.rs

Created January 29, 2021 21:10

Cloning borrows to things that lack a Clone impl simply return the original borrow.

	// NB. fix
	// #[derive(Debug, Clone)]
	#[derive(Debug)]
	struct Context;

	fn dupe_context(context: &Context) -> Context {
	context.clone()
	}

	fn main() {

justanotherdot / asref-borrow.rs

Created January 29, 2021 20:57

You may be borrowing the wrapper rather than the contents that you want.

	#[derive(Debug, Clone)]
	struct Resource(usize);

	#[derive(Debug)]
	struct Error;

	fn may_fail(ix: usize) -> Result<Resource, Error> {
	if rand::random::<f64>() < 0.5 {
	Err(Error)
	} else {

justanotherdot / date-cmp.sh

Created January 28, 2021 02:15

Compare twwo dates.

	: {d1:=1}
	: {d2:=2}
	: {op:?"provide an operator for comparison"}

	lhs=date -j -f "%F" "$d1" +%s 2>/dev/null
	rhs=date -j -f "%F" "$d2" +%s 2>/dev/null
	case $op in
	"eq")
	[ lhs -eq rhs ] ;;
	"ge")

justanotherdot / clone-repos.sh

Last active January 28, 2021 02:08

Clone all repos for an org via the gh tool.

	: {org:?"need to set an org name"}
	: {max_pages:?"need to set maximum number of pages"}

	for PAGE in $( seq $max_pages ); do
	gh api ‘orgs/$org/repos?per_page=100&page=‘“$PAGE” \| jq -r ‘map(.name) \| .[]' \| while read NAME; do
	git clone “[email protected]:$org/$NAME”
	done

Ryan James Spencer justanotherdot