Daniel Beard daniel-beard

Optics By Example Cheat Sheets

The following are appendices from Optics By Example, a comprehensive guide to optics from beginner to advanced! If you like the content below, there's plenty more where that came from; pick up the book!

Operators
Composition Guide
Substitution Guide
Optical Constarints and Types

Operator Cheat Sheet

New Build System Tricks

Command Line

# enable internal menu
defaults write com.apple.dt.Xcode ShowDVTDebugMenu -bool YES

alias xcbuild=$(xcode-select -p)/../SharedFrameworks/XCBuild.framework/Versions/A/Support/xcbuild

New Build System Tricks

Command Line

alias xcbuild=$(xcode-select -p)/../SharedFrameworks/XCBuild.framework/Versions/A/Support/xcbuild
# THIS DOESNT WORK YET: xcbuild openIDEConsole  # … then switch to Xcode ➡️
xcbuild showSpecs
xcbuild build <foo.pif> [—target <target>]

How to recover lost Python source code if it's still resident in-memory

I screwed up using git ("git checkout --" on the wrong file) and managed to delete the code I had just written... but it was still running in a process in a docker container. Here's how I got it back, using https://pypi.python.org/pypi/pyrasite/ and https://pypi.python.org/pypi/uncompyle6

Attach a shell to the docker container

Install GDB (needed by pyrasite)

apt-get update && apt-get install gdb

	import Foundation

	extension Decodable where Self: Encodable {
	/// Creates a new instance and changes the value for the provided key.
	///
	/// - Parameters:
	/// - key: The key path to the property that you want to modify.
	/// Use period to separate levels and [] for indexes.
	/// Examples: "id", "name.firstName", "children[2].name.firstName"
	///

	extension RangeReplaceableCollection {
	static func += (collection: inout Self, element: Element) {
	collection.append(element)
	}

	static func += (collection: inout Self, element: Element?) {
	if let element = element {
	collection.append(element)
	}
	}

	#!/usr/bin/env xcrun -sdk macosx swift

	// Displays UI in an NSWindow which can interact with the commandline
	// Usage: `echo "Bar" \| ./swift-ui-commandline-tool.swift`

	import Foundation
	import SwiftUI

	extension CommandLine {
	static let input: String = { AnyIterator { readLine() }.joined() }()

	#! /usr/bin/env stack
	-- stack --resolver lts-18.8 script

	{-# LANGUAGE OverloadedStrings #-}

	{-
	This is a handy illustration of converting between five of the commonly-used
	string types in Haskell (String, ByteString, lazy ByteString, Text and lazy
	Text).

	#!/bin/bash

	CLEAR='\033[0m'
	RED='\033[0;31m'

	function usage() {
	if [ -n "$1" ]; then
	echo -e "${RED}👉 $1${CLEAR}\n";
	fi
	echo "Usage: $0 [-n number-of-people] [-s section-id] [-c cache-file]"

	#include <string.h>
	#include <stdlib.h>
	#include <unistd.h>
	#include <mach-o/dyld.h>
	#include <mach-o/nlist.h>
	#include <mach-o/dyld_images.h>
	#include <mach/mach_vm.h>

	/* Dyld is the OSX Dynamic Linker
	* /usr/include//mach-o/loader.h