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Programming Leftovers

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  • Lisp In 436 Bytes | Hackaday

    You would assume that any programming language available back in the 1960s would be small enough to easily implement on today’s computers. That’s not always true though, since old languages sometimes used multiple passes. But in some cases, you can implement what would have been a full language decades ago in a tiny footprint. A case in point is a pretty good implementation of Lisp — including garbage collection — in 436 bytes.

    SectorLISP claims to be the tiniest real language, beaten only by toy languages that are not really very useful. If you want to, you can try it in your browser, but that version has better error messages and persistent bindings, so it hogs up a whole 509 bytes.

  • Welcome to our Qt Champions for 2021!

    It is now finally time to report that @SGaist, @mrjj, @aha_1980 and Orgad Shaneh representing the Qt Lifetime Champions have now come to a consensus on the Qt Champions of 2021! A special thank you to all of you for your help in this regard!

    Before getting into the winners of this year, I want to take the time to thank everyone for their nominations and to everyone's contributions from the Qt Community in making 2021 a great year for Qt!

  • All about property bindings in Qt 6.2

    Qt 6 introduced bindable properties a while ago. Based on our experience and feedback we got after the 6.0 release, we further improved the underlying engine. In this post we will give the overview of the bindable properties, see what has changed since our last update on property bindings, and discuss why you may want to use the new property bindings in your C++ code.

  • OpenCV Knows Where Your Hand Is | Hackaday

    We have to say, [Murtaza]’s example game in his latest video isn’t very exciting. However, the OpenCV technique he uses to track a hand and determine its distance from a single camera is pretty interesting. The demo shows a random button on the screen and you have to use your hand to press the button which then moves so you can try again. The hand measurement seems accurate to a few centimeters which is good enough for many applications.

    The Python code is actually quite straightforward. Essentially, the software tracks your hand and by estimating its relative size to determine how far away it is. Of course, your hand might also rotate, and [Murtaza] works through all the cases step-by-step. If we wanted to know a distance, we’d probably turn to ultrasonics or a time of flight sensor. The problem is, those sensors can’t tell your hand from anything else that happens to be in front of it. The use of a single camera to track and locate is pretty impressive.

  • LLVM Clang Lands Initial SPIR-V Toolchain Support - Phoronix

    An exciting LLVM development has landed in time for Christmas! Complementary to the LLVM SPIR-V back-end work that could soon be mainlined, Clang has now merged the initial SPIR-V toolchain support. This allows going from Clang to the SPIR-V intermediate representation that is conformant to the OpenCL environment specification -- such as for compiling OpenCL kernels into SPIR-V.

    Without the LLVM SPIR-V back-end itself being merged yet, the Clang SPIR-V toolchain relies upon the external LLVM to SPIR-V translator (llvm-spirv) for the conversion process. Once that big SPIR-V back-end is merged and in good standing, it can transition to using that within the LLVM code-base rather than requiring the external llvm-spirv tool.

  • Raku Advent Calendar: Day 24 – Packaging and unpackaging real good

    After all Rakuing along all Christmas, Santa realizes it’s a pretty good idea to keep things packed and ready to ship whenever it’s needed. So it looks at containers. Not the containers that might or might not actually be doing all the grunt work for bringing gifts to all good boys and girls in the world, but containers that are used to pack Raku and ship it or use it for testing. Something you need to do sooner or later, and need to do real fast.

  • My Favorite Warnings: ambiguous

    ... computer language design is just like a stroll in the park. Jurassic Park, that is. -- Larry Wall

    Perl's grammar is inherently ambiguous. That is, it is possible for a syntactically correct chunk of Perl to have more than one valid interpretation. Maybe this is because Larry Wall is a linguist? After all, natural languages are full of ambiguity.

    The ambiguous warning is part of the group syntax; that is to say, use warning 'syntax'; enables ambiguous, as well as other warnings in that group. Of course, if appropriate you can just use warning 'ambiguous'; if more precision is justified. Both warnings go back to Perl 5.6, when the warnings pragma itself was introduced.

  • Rakudo compiler, Release #152 (2021.12)

    On behalf of the Rakudo development team, I’m very happy to announce the December 2021 release of Rakudo #152. Rakudo is an implementation of the Raku1 language.

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.