aNNi::Writes

tiki - markdown project management

2026-03-31T12:34:00+00:00

Almost 8 months ago, I switched from Kanboard to self-hosted Gitea</a> for managing my personal projects. It's not perfect, has limitations, unusable on mobile, but it fits my needs, so I keep using it.</p>

But recently, I found a cool project called tiki</a>. It's a markdown-based git-versioned documentation and issue management tool. All tasks live in your project directory. Here's why I think you'd love it if you're a fan of terminal user interfaces:</p>

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How I almost lost access to the Oracle Cloud server

2025-12-07T10:34:00+00:00

Recently, I tried to set up a network tunnel to access some of my services running on a free-tier Oracle Cloud ARM compute instance. Despite correctly setting the ingress rules and iptables</code> and ufw</code>, there was a problem with opening the UDP port. Then I made a stupid mistake: I routed all the server's traffic through the closed port.</p>

AllowedIPs = 0.0.0.0/0, ::/0</span></span></code></pre>
And</p>
wg-quick</span> up wg0</span></span></code></pre>
Immediately, my SSH connection was closed. All my running services stopped responding.</p>


Kanboard to Gitea migration
2025-08-05T19:17:00+00:00
Some time ago I decided to move all tasks from Kanboard</a> closer to the projects in my Gitea self-hosted instance. Surprisingly, Gitea doesn't have any importers, so I ended up preparing the data and calling the Gitea API.</p>
</p>


Image Processing 10. Convolution Kernel
2025-06-29T23:06:00+00:00
With convolution kernel it's possible to implement numerous interesting effects, such as motion blur, sharpening, edge detecting, emboss, etc. These effects we going to explore in this article.</p>
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Image Processing 9. Blur
2025-06-24T00:38:00+00:00
Let's return to pixel processing and this time explore image blurring algorithms.</p>
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Image Processing 8. Image scaling
2025-06-23T21:17:00+00:00
Let's explore a highly relevant topic in image processing: image scaling. You've likely encountered this task and may have even heard about interpolation algorithms used for scaling. This article will focus on that.</p>
</p>


Image Processing 7. Histogram
2025-06-19T23:04:00+00:00
Today's article is about histograms. I'll cover what histograms can tell us about a photo, how to construct histograms, and how image adjustments affect their appearance.</p>
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Image Processing 6. Brightness, saturation, contrast, gamma correction
2025-06-15T21:35:00+00:00
Let's examine the most fundamental image correction parameters: brightness, saturation (without switching to HSV color model), contrast, and gamma.</p>
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Image Processing 5. Color Models
2025-06-15T08:21:00+00:00
Working with the RGB model isn't always convenient. For example, printers don't follow the RGB model, because they use white paper and consume less ink for light tones. This is why multiple models exist to solve various tasks. We'll discuss the main color models here. And to keep things interesting, we'll  play around with some sliders.</p>
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Image Processing 4. Desaturation
2025-06-14T19:58:00+00:00
Next up is the Desaturation filter</strong>, which converts a color image to grayscale.</p>
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Image Processing 3. Negate filter, channel extraction and inversion
2025-06-10T13:34:00+00:00
In this article we'll split images into color components, create a negate filter, and invert individual channels. Finally, we'll manipulate RGB components!</p>
</p>


Image Processing 2. Simple transformation
2025-06-09T17:58:00+00:00
In this article, we'll implement flipping and 90°/270° rotations for images. But before doing that, let's explore image pixel data and how to access it in JavaScript.</p>
</p>


Image Processing 1. Introduction
2025-06-07T20:13:00+00:00
In this introductory article I'll explain how color is encoded in computer graphics, make you work a bit</em> with bits, and show how to manipulate pixels a better way in JavaScript.</p>
</p>


WezTerm projects selector
2025-04-04T14:42:00+00:00
Personally, I like WezTerm for using lua configs instead of boring json/yaml/toml files, and for the powerful and configurable multiplexer. In this post I'll show you how to create a fuzzy project selector that launches a named workspace, splits a window and executes predefined commands.</p>
</p>


Complete guide to Java Stream API in pictures and examples
2025-02-16T17:19:00+00:00
Since the release of Java 8, I almost immediately started using the Stream API, because I liked the functional approach of data processing. I wanted to use it everywhere, so I began developing my own library, which brings a similar approach to earlier versions of Java, specially for Android. I was also interested in the stream internals. Over time, I've accumulated enough experience, and now I'm eager to share it.</p>
In this article, along with a description of streams, I provide visual demonstrations of how operators work, as well as examples and self-checking tasks. It also covers new features related to streams in Java 9+.</p>

  
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</video>


Geotagging is easy. Rust CLI app
2025-01-26T17:55:00+00:00
In this section, we will create a CLI application in Rust that collects all the necessary data to display photos on the map: coordinates, some camera information, a thumbnail, and will also generate the map.</p>
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Geotagging is easy. Clustering
2025-01-18T18:12:00+00:00
If there are a lot of photos, displaying them all at once on the map is not the right choice for UX and performance. So let's group the photos and display their count.</p>
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Geotagging is easy. OpenLayers
2025-01-14T17:19:00+00:00
I've always found it tedious and difficult to display stuff on maps. To understand the API, you need examples that aren't always accessible because they require a token to display and interact with the map. The token has to be obtained and hidden from other people's eyes.</p>
But then I thought, why do I need proprietary Google Maps when there is OpenStreetMaps? I searched for APIs, came across OpenLayers</a>, opened examples and was surprised by their number and simplicity.</p>
</p>
In this series of articles, we will explore OpenLayers, display photo thumbnails on a map, add clustering, and finally create a Rust application that collects geodata and thumbnails from photos and generates a map.</p>


How to write code so that it grows in height, not in width
2020-11-10T16:10:00+00:00
Every time we add a new if or for to code, we have to increase the indent of the condition body or loop. The more nested loops and conditions, the broader your code becomes, and the more difficult it becomes to read. In this short article, I'll show a few techniques by which you can avoid increasing indentation. Your code will be clearer, and you'll never see horizontal scrolling.</p>
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