RiN r17x

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

Clarify and agree on the scope of the system

User cases (description of sequences of events that, taken together, lead to a system doing something useful)
- Who is going to use it?
- How are they going to use it?

Install and Create Emulators using AVDMANAGER and SDKMANAGER

TL;DR

For generic skin emulator with default apis (without google apis):

List All System Images Available for Download: sdkmanager --list | grep system-images
Download Image: sdkmanager --install "system-images;android-29;default;x86"

Basic Tmux Usage

https://tmux.github.io/ <-- Tmux project

http://z.umn.edu/tmuxgist <-- this document!

The Prefix Keystroke `Ctrl-b`

Crtl-b c Create a new window
Crtl-b <N> Switch to window <N>
Crtl-b ? List available keystrokes
Crtl-b , Rename current window

Once upon a time there was a user that wanted to install firefox.

The user tried to do pacman -S firefox but it didn't work. The all mighty pacman reported that firefox-3.2.4-1.i686.pkg.tar.gz could not be found on his mirror. So the user tried pacman -Sy firefox. It worked and the user rejoiced since he could once again go and troll /h/.

But all was not good. The user had made a grave error!

See, when the user told the almighty pacman to -Sy firefox, pacman did

Mutt + isync multiple accounts Unfinished

This is the setup that I use for mutt, I have two google domain account (read as gmail) and an institution where I work and study account. This means I have two gmail accounts and one outlook 365 account that i want to sync and read via mutt.

I want to store all my email locally as I travel a lot and will be in countries without easy internet access. For this I use mbsync (iSync). As it can handle multiple account types easily and efficently.

The setup works this way

[Remote Mail Servers] <= mbsync => [Local Mail Folders]

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

I curate a list of interesting CLI tools, below are some command line tools that I personally love and use

ripgrep - Search text for patterns fast.
fzf - Command-line fuzzy finder.
exa - Replacement for ls written in rust.
git - Version control.
youtube-dl - Download videos from YouTube and other video sites.
tmux - Terminal multiplexer.
direnv - Environment switcher for the shell.
trash - Move files and folders to the trash.

	#!/bin/sh

	print_usage() {
	echo "usage: compress_video <input_file>"
	echo "supported formats: mp4, webm, mkv, mov, avi, flv"
	}

	get_extension() {
	f="${1##*/}"
	case "$f" in

	open Belt;

	[@bs.deriving abstract]
	type queryConfig('data, 'key, 'fnParamsFilter) = {
	[@bs.optional]
	retry: int,
	[@bs.optional]
	retryDelay: int,
	[@bs.optional]
	initialData: unit => 'data,

	import { h, Component } from 'preact';
	import Markup from 'preact-markup';
	import register from './preact-custom-element';

	// just a proxy component: WC -> Preact -> WC
	const A = () => <x-b foo="initial foo from <x-a>" />;

	// stateful component that can re-render
	class B extends Component {
	render(props, state) {