Godot: Dragging and dropping physics objects video

Series: 2D Shapes, drag and drop, new objects

Continuing to explore the Godot 3 game engine. I want to make a game where you drag blocks around and balance them on each other, but I couldn’t find much documentation on how to drag-and-drop objects (except menu UI elements), and especially I found quite a few wrinkles when doing this with objects that are normally controlled by the physics engine.

This time we actually write some code in Godot’s programming language, GDScript.

Godot version: v3.0.6.stable.official.8314054

Migrating videos from YouTube to PeerTube inside a Docker container

I have quite a few videos hosted on YouTube that I would like to upload to my new PeerTube location, but I don’t want to install all the PeerTube dependencies on my machine, so I did it all inside a Docker image.

First I built and started a Docker container:

$ git clone https://github.com/chocobozzz/PeerTube /tmp/peertube
$ cd /tmp/peertube
$ docker build . -f ./support/docker/production/Dockerfile.stretch --tag peertube
$ docker run --tty --interactive peertube bash

Then I ran these commands inside it:

# yarn install --production=false
# node dist/server/tools/import-videos.js -u "https://peertube.mastodon.host" -U "andybalaam" -t "https://www.youtube.com/watch?v=TG0qRDrUPpA"

Of course, it would be better to write this up into its own Dockerfile to make this a one-liner.

References: PeerTube Docker setup, PeerTube video import.

Writing a unit test in Elm

Series: Snake in Elm, Elm makes me happy, Elm Basics, Elm Unit Test, Elm JSON

I’ve been having fun with Elm programming recently. Elm is a replacement for JavaScript that is pure functional and highly practical.

Here’s how to go from nothing installed at all to writing a unit test that passes, in just over 10 minutes.

The source code is here: github.com/andybalaam/elm-unit-test-example

How to write a programming language – Part 3, The Evaluator

Series: Lexer, Parser, Evaluator.

Finally, we get onto the actual magic of the little language I wrote (Cell) – the evaluator, which takes in syntax trees and finds their real value, in the context of the “environment”: the symbols that are defined around it.

Slides: How to write a programming language – Part 3, The Evaluator

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