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Leftovers: UML, Programming, Emacs and Events

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  • 10 Best Free Unified Modeling Language Tools

    Unified Modeling Language (UML) is a general-purpose, modeling language designed to provide a standard way for visualizing, specifying, constructing, and documenting the artifacts of distributed object systems. It’s the industry standard modeling language for software engineering.

    The aim of UML is to give software engineers, agile and small development teams, and system architects useful tools for analysis, design, and implementation of software-based systems. It also provides modeling business and similar processes. The language helps to visualize your object-oriented design and communicate with others. It offers limited use for other programming paradigms.

    UML offers an efficient way to communicate object programming concepts that are not intuitive between programmers and end users. It can also be very precise and helps to avoid ambiguities when you define your system.

    UML is composed of many model elements that represent the different parts of a software system. The UML elements are used to create diagrams, which represent a certain part, or a point of view of the system. A full list of the diagrams is set out at the end of this article.

  • Norbert Preining: CafeOBJ 1.6.0 released

    We have released version 1.6.0 of CafeOBJ, an algebraic specification and verification language.

  • 5 ways to use Emacs as your RPG dashboard

    There are two ways to play a tabletop role-playing game (RPG): You can play an adventure written by the game's publisher or an independent author, or you can play an adventure that is made up as you go. Regardless of which you choose, there's probably prep work to do. One player (generically called the game master) must gather monster or enemy stats, loot tables, and references for rules, and the other players must build characters and apportion (pretend) equipment. Nothing's going to eliminate prep work from a complex RPG, but if you're an Emacs user, you might find that Emacs makes a great dashboard to keep everything all straight.

    Organize the rules

    Unfortunately, the digital editions of many RPGs are distributed as PDFs because that's what the RPG publisher sent to the printer for the physical edition. PDFs are good at preserving layout, but they're far from an ideal eBook format. If you play RPGs published under an open license, you can often obtain the rules in alternate formats (such as HTML), which gives you more control and flexibility. Even the world's first and most famous RPG, Dungeons & Dragons, provides its rules as a free download in digital format (which has been translated into HTML and Markdown by many a website).

    I open the rules as Markdown in Emacs so that I have a searchable reference at the ready. While opening the rules as a PDF in a PDF reader lets you search for embedded text, using a text file instead provides several benefits. First of all, a text file is much smaller than a PDF, so it's faster to load and to search. Second, text files are easily editable, so if you find a rule that sends you seeking clarification, you can add what you learn (or whatever you make up) directly into your master document. You can also add house rules and additional resources. My aim is to have a single file that contains all of the rules and resources I use in games I run, with everything a quick Ctrl+s (C-s in Emacs notation) away.

  • The 2020 Rust Event Lineup

    A new decade has started, and we are excited about the Rust conferences coming up. Each conference is an opportunity to learn about Rust, share your knowledge, and to have a good time with your fellow Rustaceans. Read on to learn more about the events we know about so far.

  • Bootlin at FOSDEM and Buildroot Developers Meeting

    This week-end takes place one of the biggest and most important free and open-source software conference in Europe: FOSDEM. It will once again feature a very large number of talks, organized in several main tracks and developer rooms.

    Bootlin CTO Thomas Petazzoni will participate to the FOSDEM conference, of course attending many of the talks from the Embedded, Mobile and Automative Devroom, to which he participated to the talk review and selection. Do not hesitate to get in touch with Thomas if you want to discuss career or business opportunities with Bootlin.

More in Tux Machines

digiKam 7.7.0 is released

After three months of active maintenance and another bug triage, the digiKam team is proud to present version 7.7.0 of its open source digital photo manager. See below the list of most important features coming with this release. Read more

Dilution and Misuse of the "Linux" Brand

Samsung, Red Hat to Work on Linux Drivers for Future Tech

The metaverse is expected to uproot system design as we know it, and Samsung is one of many hardware vendors re-imagining data center infrastructure in preparation for a parallel 3D world. Samsung is working on new memory technologies that provide faster bandwidth inside hardware for data to travel between CPUs, storage and other computing resources. The company also announced it was partnering with Red Hat to ensure these technologies have Linux compatibility. Read more

today's howtos

  • How to install go1.19beta on Ubuntu 22.04 – NextGenTips

    In this tutorial, we are going to explore how to install go on Ubuntu 22.04 Golang is an open-source programming language that is easy to learn and use. It is built-in concurrency and has a robust standard library. It is reliable, builds fast, and efficient software that scales fast. Its concurrency mechanisms make it easy to write programs that get the most out of multicore and networked machines, while its novel-type systems enable flexible and modular program constructions. Go compiles quickly to machine code and has the convenience of garbage collection and the power of run-time reflection. In this guide, we are going to learn how to install golang 1.19beta on Ubuntu 22.04. Go 1.19beta1 is not yet released. There is so much work in progress with all the documentation.

  • molecule test: failed to connect to bus in systemd container - openQA bites

    Ansible Molecule is a project to help you test your ansible roles. I’m using molecule for automatically testing the ansible roles of geekoops.

  • How To Install MongoDB on AlmaLinux 9 - idroot

    In this tutorial, we will show you how to install MongoDB on AlmaLinux 9. For those of you who didn’t know, MongoDB is a high-performance, highly scalable document-oriented NoSQL database. Unlike in SQL databases where data is stored in rows and columns inside tables, in MongoDB, data is structured in JSON-like format inside records which are referred to as documents. The open-source attribute of MongoDB as a database software makes it an ideal candidate for almost any database-related project. This article assumes you have at least basic knowledge of Linux, know how to use the shell, and most importantly, you host your site on your own VPS. The installation is quite simple and assumes you are running in the root account, if not you may need to add ‘sudo‘ to the commands to get root privileges. I will show you the step-by-step installation of the MongoDB NoSQL database on AlmaLinux 9. You can follow the same instructions for CentOS and Rocky Linux.

  • An introduction (and how-to) to Plugin Loader for the Steam Deck. - Invidious
  • Self-host a Ghost Blog With Traefik

    Ghost is a very popular open-source content management system. Started as an alternative to WordPress and it went on to become an alternative to Substack by focusing on membership and newsletter. The creators of Ghost offer managed Pro hosting but it may not fit everyone's budget. Alternatively, you can self-host it on your own cloud servers. On Linux handbook, we already have a guide on deploying Ghost with Docker in a reverse proxy setup. Instead of Ngnix reverse proxy, you can also use another software called Traefik with Docker. It is a popular open-source cloud-native application proxy, API Gateway, Edge-router, and more. I use Traefik to secure my websites using an SSL certificate obtained from Let's Encrypt. Once deployed, Traefik can automatically manage your certificates and their renewals. In this tutorial, I'll share the necessary steps for deploying a Ghost blog with Docker and Traefik.