LuisFX

PostgreSQL is Enough

See the new site: https://postgresisenough.dev

Start with a fresh folder and copy a hapi.properties into it. It will be mounted into the container.

Carefully make sure your hapi.properties looks like this:

# add postgres
datasource.driver=org.postgresql.Driver
datasource.url=jdbc:postgresql://db:5432/hapi
hibernate.dialect=org.hibernate.dialect.PostgreSQL95Dialect
datasource.username=admin
datasource.password=admin

Tips on exposing F# to C#

Api and Methods

I suggest that you create one or more Api.fs files to expose F# code in a C# friendly way.

In this file:

Define functions with PascalCase names. They will appear to C# as static methods.
Functions should use tuple-style declarations (like C#) rather than F#-style params with spaces.

Basic Tooling Setup

Fable is an F# language to javascript compiler powered by Babel.

F# is a language that runs on a Microsoft CLR. Using the .NET Core CLR implementation it works on Windows, Mac or Linux.

F# Linux

.NET Core SDK - download the latest 2.1 SDK
Mono - mono-complete package
F# compiler - fsharp package from the mono repository

Installing .NET Core on Linux ARM64

The following intructions can be used to install .NET Core on Linux ARM64.

Pro tip: Check out .NET Core Docker files to determine the exact instructions for installing .NET Core builds, for example .NET Core 3.1 ARM32 SDK Dockerfile.

Installing .NET Core Globally

The following instructions install the latest .NET Core globally. It isn't required to do that, but it provides the best experience.

Introduction

This works to install Open GApps into the Android Emulator, working around the issue where the system partition is too small.

With it, I can get Google Play installing into the emulator. Tested on KitKat (API 19), Lollipop (API 21) and Oreo (API 27).

It's tested on MacOS.

	open System

	/// A train carriage can have a number of different features...
	type Feature = Quiet \| Wifi \| Toilet

	/// Multiple classes
	type CarriageClass = First \| Second

	/// Carriages can be either for passengers or the buffet cart
	type CarriageKind =

	<aside class="relative bg-blue-700 lg:self-stretch lg:w-64 w-full shadow-xl flex flex-col">
	<div class="p-6 flex justify-between">
	<a href="..">
	<img class="object-scale-down h-8 lg:h-32" src=".." alt=".. Logo"/>
	</a>
	<div class="block lg:hidden">
	<button id="nav-toggle" class="flex items-center px-3 py-2 border rounded text-white border-white">
	<svg class="fill-current h-3 w-3" viewBox="0 0 20 20" xmlns="http://www.w3.org/2000/svg">
	<title>Menu</title>
	<path d="M0 3h20v2H0V3zm0 6h20v2H0V9zm0 6h20v2H0v-2z"/>

	module Expr where

	data Expr a = Var a \| Val Int \| Add (Expr a) (Expr a)
	deriving Show

	instance Functor Expr where
	-- fmap :: (a -> b) -> Expr a -> Expr b
	fmap f (Var x) = Var $ f x
	fmap _ (Val n) = Val n
	fmap f (Add l r) = Add (fmap f l) (fmap f r)

	(*
	CapabilityBasedSecurity_ConfigExample.fsx

	An example of a simple capability-based design.

	Related blog post: http://fsharpforfunandprofit.com/posts/capability-based-security/
	*)

	/// Configuration system
	module Config =