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Programming Leftovers

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  • Release the pressure: Win16 support arrives for version 3.2 of Free Pascal

    Great news, Pascal fans. After a lengthy hiatus, the cross-platform Free Pascal has emerged with an array of new features and new targets.

    Version 3.2.0 of Free Pascal has arrived in the 50th anniversary year of the Pascal language with new features and compiler targets, including Aarch64 and the venerable 16-bit Windows.

    While it uses its own dialect of Object Pascal, fans of Delphi and Turbo Pascal should feel at home. Free Pascal has also continued rolling while the likes of GNU Pascal seem to have stalled somewhat.

  • R and CRAN Binaries for Ubuntu

    Welcome to the 27th post in the rationally regularized R revelations series, or R4 for short. This is a edited / updated version of yesterday’s T^4 post #7 as it really fits the R4 series as well as it fits the T4 series.

    A new video in both our T^4 series of video lightning talks with tips, tricks, tools, and toys is also a video in the R^4 series as it revisits a topic previously covered in the latter: how to (more easily) get (binary) packages onto your Ubuntu system. In fact, we show it in three different ways.

    The slides are here.

  • Qt QML Maps – Using the OSM plugin with API keys

    For a recent side-project I’ve been working on (a cycle computer for UBPorts phones) I found that when using the QtLocation Map QML element, nearly all the map types provided by the OSM plugin (besides the basic streetmap type) require an API key from Thunderforest. Unfortunately, there doesn’t appear to be a documented way of supplying an API key to the plugin, and the handful of forum posts and Stack Overflow questions on the topic are either unanswered or answered by people believing that it’s not possible. It’s not obvious, but after a bit of digging into the way the OSM plugin works I’ve discovered a mechanism by which an API key can be supplied to tile servers that require one.

    When the OSM plugin is initialised it communicates with the Qt providers repository which tells it what URLs to use for each map type. The location of the providers repository can be customised through the osm.mapping.providersrepository.address OSM plugin property, so all we need to do to use our API key is to set up our own providers repository with URLs that include our API key as a parameter. The repository itself is just a collection of JSON files, with specific names (cycle, cycle-hires, hiking, hiking-hires, night-transit, night-transit-hires, satellite, street, street-hires, terrain, terrain-hires, transit, transit-hires) each corresponding to a map type. The *-hires files provide URLs for tiles at twice the normal resolution, for high DPI displays.

  • Implementing geohashing at scale in serverless web applications

    Many web and mobile applications use geospatial data, often used with map overlays. This results in dataset queries based upon proximity, for questions such as “How far is the nearest business?” or “How many users are nearby?” Applications with significant traffic need an efficient way to handle geolocation queries. This blog post explores a simple geohashing solution for serverless applications, and how this can work at scale.

    Geohashing is a popular public domain geocode system that converts geographic information into an alphanumeric hash. A geohash is used to identify a rectangular area around a fixed point. The length of the hash determines the precision of the area identified. This allows you to use a hierarchical search where the length of the geohash corresponds to the size of a search area.

  • Percepio Adds Embedded Linux Support to Tracealyzer Visual Trace Diagnostic Tool
  • Russell Coker: Squirrelmail vs Roundcube

    For some years I’ve had SquirrelMail running on one of my servers for the people who like such things. It seems that the upstream support for SquirrelMail has ended (according to the SquirrelMail Wikipedia page there will be no new releases just Subversion updates to fix bugs). One problem with SquirrelMail that seems unlikely to get fixed is the lack of support for base64 encoded From and Subject fields which are becoming increasingly popular nowadays as people who’s names don’t fit US-ASCII are encoding them in their preferred manner.

    I’ve recently installed Roundcube to provide an alternative. Of course one of the few important users of webmail didn’t like it (apparently it doesn’t display well on a recent Samsung Galaxy Note), so now I have to support two webmail systems.

  • Perl Weekly Challenge 65: Digit Sum

    These are some answers to the Week 65 of the Perl Weekly Challenge organized by Mohammad S. Anwar.

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.