cvogt

# Configuring DNS-over-TLS on macOS
# Worked on macOS 10.13.4
brew -v update
brew -v doctor
# Next two commands are optional
sudo chown -R $(whoami) $(brew --prefix)/*
echo 'export PATH="/usr/local/sbin:$PATH"' >> ~/.bash_profile
# Install DNS client
brew install knot-resolver
# Should be installed to something like: /usr/local/Cellar/knot-resolver/2.3.0/sbin/kresd

cvogt

#!/usr/bin/env python2.7
# https://gist.github.com/cvogt/1e46597e39bfe0e0aee8d5348123ca03
# based on https://gist.github.com/alexeygrigorev/a1bc540925054b71e1a7268e50ad55cd#file-vimeo-download-py
# also see https://github.com/eMBee/vimeo-download

import requests
import base64
import sys
from tqdm import tqdm

cvogt

case class Foo( bar: Bar )
case class Bar( bar: Baz )
case class Baz( bar: Booyah )
case class Booyah( i: Int, s: String )

object V1Serializers{
  implicit def FormatFoo[Foo] = ...
  implicit def FormatBar[Bar] = ...
  implicit def FormatBaz[Baz] = ...
  implicit def FormatBooyah[Booyah] = ...

cvogt

// DEFAULT VALUES

def foo(str: String = "test") = ???
assert( foo.str == "test" ) // new: named access to default values

case class Bar(str: String = "test")
assert( Bar.apply.str == "test" ) // same for case classes via .apply method

// REPETIION-FREE .copy (aka lenses light)

cvogt

package com.pretend.myforklift

import com.liyaos.forklift.slick.{ SlickCodegen, SlickMigrationCommandLineTool, SlickMigrationCommands, SlickMigrationManager }

import scala.io.StdIn

trait MyMigrationCommands extends SlickMigrationCommands
  with MyMigrationFilesHandler {
  this: SlickMigrationManager with SlickCodegen =>

cvogt

package tut

import java.io.{ OutputStream, FilterOutputStream }

// FilterOutputStream that removes ANSI escapes. This should be fairly efficient, I guess, since
// it's all case switches on constants. Can inline more if needed but it seems fine. For the
// record, the format is ESC '[' digits (';' digits)* terminal
case class AnsiFilterStream(os: OutputStream) extends FilterOutputStream(os) {

  case class State(apply: Int => State)

cvogt

Getting Started in Scala

This is my attempt to give Scala newcomers a quick-and-easy rundown to the prerequisite steps they need to a) try Scala, and b) get a standard project up and running on their machine. I'm not going to talk about the language at all; there are plenty of better resources a google search away. This is just focused on the prerequisite tooling and machine setup. I will not be assuming you have any background in JVM languages. So if you're coming from Python, Ruby, JavaScript, Haskell, or anywhere…  I hope to present the information you need without assuming anything.

Disclaimer It has been over a decade since I was new to Scala, and when I was new to Scala, I was coming from a Java and Ruby background. This has probably caused me to unknowingly make some assumptions. Please feel free to call me out in comments/tweets!

One assumption I'm knowingly making is that you're on a Unix-like platform. Sorry, Windows users.

Getting the JVM

cvogt

object PartiallyDynamicConfig{
  def main(args: Array[String]): Unit = {
    Application.run(
      Config(
        sys.props.get("db.host") getOrElse "db.test-server.com",
        10000
      )
  }
}

cvogt

object DynamicConfig{
  def main(args: Array[String]): Unit = {
    Application.run(
      Config(
        sys.props.get("db.host").get,
        10000
      )
  }
}

cvogt

object SwitchableConfig{
  def main(args: Array[String]): Unit = {
    val config = System.getProperty("config") match {
      case "test" => Config("db.test-server.com",10000)
      case "production" => Config("db.production-server.com",12345)
      case _ => throw new Exception("unknown config: "+config)
    }
    Application.run( config )
  }
}