For once, something on this blog that isn’t C++.

Harmonicon is a rhythm game for blues harmonica. Notes scroll toward a hit line and you play on an actual harmonica, into your microphone, and the game listens.

The idea

The harmonica is cheap, fits in a pocket, and it hides everything: the reeds are inside, your tongue and throat do most of the work, and nothing about the instrument tells you whether the note that just came out is the note you meant. You can practise a bend wrong for a month quite happily.

Let the instrument be the input. Harmonicon captures the microphone, runs pitch detection on it in real time, and scores what you actually played against the chart. Every note you score is a note you genuinely hit.

Playing a song

The default view is one lane per hole: ten for a diatonic, twelve for a chromatic, taken from whatever the chart was written for. Blue notes are blows, orange are draws, and the number on each is the hole you need. Above the lanes there’s the phrase in standard notation and as harmonica tab, because those are the two ways harmonica players actually read music, and the panel on the right tells you which harp to pick up and which position you’re playing in.

There’s also a 3D view, which is the same game rendered around a harmonica model that moves with the beat.

I went to FOSSASIA Summit 2026 in Bangkok, and I took the time to write this report because of how much things happened in three days, also because I am not much of a blogger.

FOSSASIA is Asia’s big open source event and this year it took place at True Digital Park West - a rather exageratted shopping mall and convention center, which was great because whenever I was hungry I could just quickly go eat some lovely thai dishes, and back.

Welcome to the first “Codevis Weekly Update”

What is Codevis?

Codevis is a tool to help developers manage large codebases, sponsored by Bloomberg, developed by Codethink and hosted on the KDE Infrastructure, with all that, completely opensource with a permissive license. Codevis uses a mix of technologies to do what it does, mainly LLVM and Clang to do the heavy lifting of understanding C++ Codebases, Qt for Callback management (in the form of Signal/Slots), KDE Frameworks libraries for the desktop application, and pure Qt for the CLI application. The database layer is written with Soci , the same database layer used in CERN, targeting sqlite3.

But How does it work?

Codevis analyzes all the visible source code from your project and creates a graph database (using a relational database) in a way that the analyst can load and interpret information from the codebase without loading the codebase. The graph-database is comprehensive, and has all the information we think it’s important, and also a lot of information that’s good to have, with a bunch of information because why not. Since something that’s not important for me could be really important for a company with billions of lines of code.

It just generates visualization?

No. Codevis also allows you to draw your software architecture and generate ready-to-compile c++ code from it. Think of this as a possibility to have C++ templates for complex projects tha are also visually documented. You can create libraries, classes, structures, connect them quickly on a dirty mockup during a meeting, and the output could be 60 c++ files on disk with all the classes, folder-hierarchy and CMake ready to compile.

This will not add any method or implement anything, but just the creation of the C++ files and CMake scripts from a small architecture meeting is pretty interesting in my point of view.

It’s been a Long long time without posting anything. Not that i’m lazy (well, a bit). But I have been working on a lot of things related to KDE this past few years, and I was finally able to release and opensource Codevis. I know this post is as small as a tweet, just checking if the integration is stil working

This year konsole kept the momentum it gained in 2020, and implemented quite a lot of userful new features. We Finally implemented Reflow, thanks to the combined effort of me and Carlos Alves - that was one of the most requested features of konsole for the entire history of the project.

Ahmad Samir fixed tons of issues in konsole, all around the codebase, he’s the person with most commits on konsole this year, praise to him.

I’m using for my own personal projects a generator for c++ preferences for quite a while, I’ll not say that it’s heavily tested as KConfigXT is, but it is also much more simple than it.

While talking about it to a fellow developer he asked me how hard it would be to port the thing to KConfig (as the main backend I used was QSettings) - and the result is quite nice, the port toook less than a day, and now my generator generates configurations for both KConfig and QSettings.

• Example configuration:

preferences.conf

#include <QString>
#include <QStandardPaths>

Preferences {
    General {
        int beatsPerMinute = 60
    }
    Some {
        Inner {
            Group {
                int value = 10
            }
        }
    }
    Harmonica {
        QString partitureFolder = QStandardPaths::writableLocation(QStandardPaths::DocumentsLocation)
    }
}

For those that worked with KConfigXT, it’s easy to see how much this is different from the xml that the tool uses. And differently from KConfigXT, the code is smaller, easier to read, and does not rely on magic enums, nor it has a lot of different possibilities to fine tune the settings - if you want to choose between runtime or compile time file, shared vs non shared config, etc.: KConfigXT is for you, mine is supposed to be simple and up to the point.

Konsole is having a resurge in the moment, it’s the terminal emulator of choice for the power user that wants to break the 4th wall in *nix systems. Right now it can do almost all the things I want it to do, and a few more.

Since last year you can use splits in Konsole, with full drag & drop support between tabs and windows.

You can also use Konsole to quickly check for thumbnails of anything that dolphin can show you, just by hovering with the mouse (and depending of your configuration) pressing shift/control/alt. To my knowledge Konsole is the only terminal emulator that supports this.