Dave DeLong davedelong

THIS PROJECT HAS MOVED to an actual repository at https://github.com/nevyn/SPMediaKeyTap.

Jekyll & Liquid Cheatsheet

A list of the most common functionalities in Jekyll (Liquid). You can use Jekyll with GitHub Pages, just make sure you are using the proper version.

Running

Running a local server for testing purposes:

collapsible markdown?

CLICK ME

yes, even hidden code blocks!

print("hello world!")

Exporting your 2FA tokens from Authy to transfer them into another 2FA application

IMPORTANT - Update regarding deprecation of Authy desktop apps

Past August 2024, Authy stopped supported the desktop version of their apps:
See Authy is shutting down its desktop app | The 2FA app Authy will only be available on Android and iOS starting in August for details.

And indeed, after a while, Authy changed something in their backend which now prevents the old desktop app from logging in. If you are already logged in, then you are in luck, and you can follow the instructions below to export your tokens.

If you are not logged in anymore, but can find a backup of the necessary files, then restore those files, and re-install Authy 2.2.3 following the instructions below, and it should work as expected.

libdispatch efficiency tips

The libdispatch is one of the most misused API due to the way it was presented to us when it was introduced and for many years after that, and due to the confusing documentation and API. This page is a compilation of important things to know if you're going to use this library. Many references are available at the end of this document pointing to comments from Apple's very own libdispatch maintainer (Pierre Habouzit).

My take-aways are:

You should create very few, long-lived, well-defined queues. These queues should be seen as execution contexts in your program (gui, background work, ...) that benefit from executing in parallel. An important thing to note is that if these queues are all active at once, you will get as many threads running. In most apps, you probably do not need to create more than 3 or 4 queues.
Go serial first, and as you find performance bottle necks, measure why, and if concurrency helps, apply with care, always validating under system pressure. Reuse

	[alias]
	; "git find" should work exactly like your system find (BSD or GNU), except for
	; two things: one, it will always ignore the current git directory; and two, if
	; you don't supply any root paths to search, it defaults to searching from your
	; git project toplevel.
	;
	; paul cannon <[email protected]> 2011

	find = "!_() { \
	declare -a preargs; \

	#!/usr/sbin/dtrace -q -s
	/*
	Overly spammy, mostly covered by the other probes (every "read" or "write" is a "request")
	CFPreferencesServer$target:::request {
	printf("REQUEST from pid %d at %Y ( domain: %s, user: %s, host: %s, container: %s, managed: %d)\n", arg0, walltimestamp, copyinstr(arg1) != NULL ? copyinstr(arg1) : "(NULL)" ?: "(NULL)", copyinstr(arg2) != NULL ? copyinstr(arg2) : "(NULL)", copyinstr(arg3) != NULL ? copyinstr(arg3) : "(NULL)", copyinstr(arg4) != NULL ? copyinstr(arg4) : "(NULL)", arg5);
	}
	*/

	CFPreferencesServer$target:::write_rejected {
	printf("REJECTED WRITE OF KEY %s request from pid %d for reason %s at %Y ( domain: %s, user: %s, host: %s, container: %s)\n", copyinstr(arg1) != NULL ? copyinstr(arg1) : "(NULL)", arg0, copyinstr(arg6) != NULL ? copyinstr(arg6) : "(NULL)", walltimestamp, copyinstr(arg2) != NULL ? copyinstr(arg2) : "(NULL)", copyinstr(arg3) != NULL ? copyinstr(arg3) : "(NULL)", copyinstr(arg4) != NULL ? copyinstr(arg4) : "(NULL)", copyinstr(arg5) != NULL ? copyinstr(arg5)

	You can specify the underlying name for a C function the linker/compiler should actually use. If you use an existing
	function's name, it will just let you refer to it with your prototype's name. If you define the function, it'll give
	it that name. It even complains if a function of that name already exists. Tested with clang on a Mac, but AFAIK also
	works in GCC. You can even use special characters in your function names, like you can do in assembly.

	https://statici.icloud.com/fmipmobile/deviceImages-9.0/iPhone/iPhone9,4-2-3-0/online-infobox__3x.png
	A B C D E F G

	A: deviceImages version seems to determine the format of the image specifier (C, D, E, F)
	B: device marketing name
	C: device model identifier
	D: color cover glass (front color)
	1 - Black
	2 - White
	E: device enclosure color (back color)

	[alias]
	xlog = log --graph --pretty=format:\"%C(yellow)%h%Creset %ad %s%C(cyan)%d%Creset %C(green)[%an]%Creset\" --date=short