halferty’s gists

halferty / compile_webassembly.sh

Created September 19, 2017 01:30

Compile C++ to webassembly. Uses LLVM, binaryen, and wabt. This sequence of commands is ridiculous, but if you want the memory buffer exported from your C++ code, you'll need this.

	#!/bin/bash
	/Users/ehalferty/objc/build/bin/clang++ -emit-llvm --target=wasm32 -Oz src/cxx/test.cxx -c -o src/cxx/test.ll
	llc src/cxx/test.ll -march=wasm32 -filetype=asm -o src/cxx/test.s
	s2wasm src/cxx/test.s > src/cxx/test.wat
	wat2wasm src/cxx/test.wat -o src/wasm/test.wasm

halferty / App.ts

Last active September 15, 2017 16:55

Loading data into / out of webassembly runtime (test.wat takes a 4096-byte buffer and adds 5 to each byte)

	// Load some sample WASM.
	const wasm = require("wasm/test.wasm");
	WASMHelper.runWat(wasm);

halferty / install_mvn_3_1_1.sh

Created July 6, 2017 23:47 — forked from aaalaniz/install_mvn_3_1_1.sh

Install Maven 3.1.1

	# Install to home directory
	cd ~

	# Extract the package
	wget http://mirror.metrocast.net/apache/maven/maven-3/3.1.1/binaries/apache-maven-3.1.1-bin.tar.gz
	tar -xf apache-maven-3.1.1-bin.tar.gz

	# Install mvn to path
	M2_HOME=$HOME/apache-maven-3.1.1
	echo -e "\n# Maven 3.1.1 Setup" >> ~/.bashrc

halferty / generatorsexample.js

Created June 9, 2017 20:42

JS Generators example

	function* exampleGenerator(i) {
	yield i + 1;
	yield i + 2;
	yield i + 3;
	}

	function run(iter) {
	let done = false;

	while (!done) {

halferty / b64

Created June 7, 2017 20:18

Base-64 encode a file

	#!/usr/bin/env ruby

	require "base64"

	file_name = ARGV[0]

	data = File.read file_name

	puts Base64.encode64 data

halferty / test.sh

Created May 1, 2017 16:52

Test SQS push with EC2 temporary credentials

(export AWS_ACCESS_KEY_ID=$(ruby -e "require \"json\"; puts JSON.parse(\`curl http://169.254.169.254/latest/meta-data/iam/security-credentials/<IAM group>\`)[\"AccessKeyId\"]"); export AWS_SECRET_ACCESS_KEY=$(ruby -e "require \"json\"; puts JSON.parse(\`curl http://169.254.169.254/latest/meta-data/iam/security-credentials/<IAM group>\`)[\"SecretAccessKey\"]"); export AWS_SESSION_TOKEN=$(ruby -e "require \"json\"; puts JSON.parse(\`curl http://169.254.169.254/latest/meta-data/iam/security-credentials/<IAM group>\`)[\"Token\"]"); export AWS_DEFAULT_REGION="us-east-1"; aws sqs send-message --queue-url "https://sqs.us-east-1.amazonaws.com/<rest of queue URL>" --message-body "Test")

halferty / .bashrc

Created April 28, 2017 17:55

Unescape URLs quickly

alias unescape='ruby -e "require \"uri\";puts URI::unescape ARGV[0]"'

halferty / disable_sprockets_cache_in_dev.rb

Last active April 17, 2017 20:55

Disable rails sprockets cache in development (probably so it's contents don't show up in your IDE's search results)

	# in config/initializers/disable_sprockets_cache_in_dev.rb

	if Rails.env.development?
	module Rails
	class Application
	def assets
	@assets \|\|= Sprockets::Environment.new(root.to_s) do \|env\|
	env.version = ::Rails.env

	path = "#{config.root}/tmp/cache/assets/#{::Rails.env}"

halferty / adbfun.ino

Last active January 17, 2017 08:55

Arduino Apple ADB fun

	#define BYTE_TO_BINARY_PATTERN "%c%c%c%c%c%c%c%c\n"
	#define BYTE_TO_BINARY(val) \
	(val & 0x80 ? '1' : '0'), \
	(val & 0x40 ? '1' : '0'), \
	(val & 0x20 ? '1' : '0'), \
	(val & 0x10 ? '1' : '0'), \
	(val & 0x8 ? '1' : '0'), \
	(val & 0x4 ? '1' : '0'), \
	(val & 0x2 ? '1' : '0'), \
	(val & 0x1 ? '1' : '0')

halferty / run.rb

Created January 6, 2017 11:36

Simple pure-ruby standard-library-only HTTP server

	#!/usr/bin/env ruby
	require 'socket'
	require 'json'
	server = TCPServer.new '0.0.0.0', 8765
	loop do
	socket = server.accept
	data = ""
	while (line = socket.gets) && line != "\r\n"
	data += line
	end

EH halferty