Hi! My name is Andrey Listopadov (a.k.a. Andrey Orst), and I’m a software developer and free software enthusiast. I use Clojure as my primary language, and have a lot of experience in C and bare metal programming. I’m a huge fan of Lisps, studying Common Lisp, and helping with the development of the Fennel language.
This is my personal space, where I share my thoughts on various (not only) programming-related topics. I do so not very regularly, so if you’re interested, you can follow me via an RSS feed to get notified of new posts. If you like something I do or want to give feedback, there’s a link section below, which describes how you can contact me. All my work is open source, and I value its principles and principles of free software.
You can think of me as a text editor enthusiast, as I often try out various text editors, and sometimes contribute to their ecosystems. I’ve written a somewhat in-depth overview of various text editors and my thoughts on why one may be better than another in various contexts.
I also like studying various programming languages to expand my reach and learn new paradigms. Furthermore, I have various amounts of experience in languages like Perl, Lua, Rust, Awk, Clojure, Scheme, Python, C, C++, Common Lisp, Zig, Racket, Erlang, and Elixir. My operating system of choice is GNU/Linux and GNU Emacs is my preferred editing software.
Projects that I made or worked on
I do a lot of stuff, and that’s primarily the reason why I decided to create this blog, so I could keep my thoughts a bit more organized, and occasionally write about stuff I’ve built. Below are some projects of mine in arbitrary order, some of which I consider finished, and some of which are still in the phase of active development.
As I’ve already mentioned, I’m working on the Fennel language itself as well as on various libraries, or just projects that I find fun. I like Fennel very much, because it brings together the simplicity and expressiveness of Lua with the flexibility of the Lisp macro system, and does so in a very smart way.
- fennel-proto-repl-protocol - a protocol powering
fennel-proto-replin the fennel-mode Emacs package.
- with-debugger - a (work in progress) step debugger for Fennel.
- Brick Game with a Twist - an entry to the first Fennel game jam.
- fennel-async - an experimental library for asynchronous programming in Fennel.
- Fennel-conditions - a condition system for Fennel language.
- Fenneldoc - a tool to turn Fennel function metadata into documentation.
- LÖVE F.A.B.R.I.K. - implementation of Forward and Backward Reaching Inverse Kinematics algorithm in Fennel using LÖVE game engine.
- LÖVE Raymarching - an example implementation of the raymarching algorithm done in Fennel language using LÖVE2D game engine. Post link.
Clojure libraries for Fennel
These libraries are very much Clojure inspired:
- lazy-seq - lazy sequence manipulation library for Fennel and Lua.
- itable - immutable table library for Lua and Fennel.
- Cljlib - a general-purpose library for Fennel language that brings functions and macros from Clojure’s core namespace.
It integrates both
itableto provide experience very similar to what you can get from Clojure.
- async.fnl - A
core.asyncport for Fennel.
- fennel-test - a Clojure-inspired unit testing library for fennel.
The aim of these libraries is to make Clojure programmers more comfortable with Fennel by providing a set of features they already know. The result may not be idiomatic Lua, but it isn’t always the target to pursue.
Clojure is my main language at work, and I did a few hobby projects in it in my spare time:
- basic raycasting engine - a small raycasting demo in ClojureScript and a tutorial on how it was done.
- time-control - a CLI app I made as a practice with GraalVM, and used for a while to keep track of how much time I spent on various activities. It was built in a rush, so it’s not the greatest example of my Clojure skills.
- wave function collapse - an implementation of the WFC algorithm that I’ve also explained in a post. The demo page features a basic tile-based editor, and some examples to try.
- cheat-json - a JSON parsing library, that basically removes bits of JSON syntax and reads the result as EDN. It’s not very fast, probably doesn’t support some tricky JSON examples, and was made more as a joke.
- CljLox - an interpreter from the first half of the Crafting Interpreters book implemented in Clojure. It features a fully immutable and extendable parser, tokenizer, and interpreter.
- pipeline-extras - a supplementary library for clojure.core.async, that provides fixed version of
pipeline-async, as well as unordered pipeline variants.
My main text editor, which I use both to write code, this blog, take notes, do agenda, and other stuff. My configuration is quite extensive, and I’m trying to extract useful stuff from it into packages:
- ob-fennel - Org Babel support for the Fennel language
- isayt.el - indent s-expressions as you type. Basically does what the name says.
- fennel-mode - major mode for the Fennel language. I’m a co-maintainer of this package.
- region-bindings.el - not to be confused with region-bindings-mode. This is another implementation of the same feature, which works better for my own use cases. It was a part of my config for a long time, but I decided to move it into a separate package.
- common-lisp-modes.el - a mode for enabling common modes for various lisps.
- infinite.el - experimental windowing system with infinite workspace.
I’ve used this text editor for some time, heavily configured it, and developed this set of plugins over time:
- plug.kak - a plugin manager for Kakoune.
- fzf.kak - a fzf integration plugin.
- smarttab.kak - Vim’s smarttab feature.
- powerline.kak - a status line plugin with themes and contextual behavior.
- langmap.kak - a plugin to toggle keyboard layout for insert mode only.
- pmanage.kak - plugin to spawn and manage background processes.
- tagbar.kak - a code outline view with Ctags.
- kaktree - an integrated filetree explorer with Tmux support.
- base16-gruvbox.kak - unofficial base16 variant of gruvbox color theme.
I’ve used Vim (and NeoVim) for a very long time, and it was my first experience with a hackable text editor. The following plugins were originally meant for personal use, but I’ve published those anyway.
- SimpleSnippets.vim - a small and fast snippet manager and template engine.
- SimpleClangFormat.vim - a clang-format integration plugin.
- SimpleWorkspaces.vim - Visual Studio Code inspired workspaces for Vim.
The Rust programming language was what finally motivated me to move away from C to some other language and start this blog. I really liked the concepts behind the borrow checking system, and overall Rust was pretty fun. For self-exercise purposes, I’ve written GRScheme - a small scheme-like language interpreter in Rust. Here’s the series of articles in which I go into implementation details. It’s not the greatest way to make a language, and the code is not the best either, but I’m still proud of it.
I’m not the biggest fan of the Lua language, it’s just that I like its virtual machine characteristics. Most stuff I’m making for it is done in Fennel because it is a better language.
- lua-inst - A simple implementation of ISO 8601 date parser for Lua.
I don’t use social networks that much. The preferred ways of reaching me are by Email or Telegram, just beware that I may be slow to respond.
Most things that I do are available under MIT or GPL3 licenses on my GitLab or GitHub profiles. So if you have any issues with any of my projects, like bugs, or want to submit a feature request, consider using the appropriate git forge, where the project is hosted.
- GitLab: @andreyorst
- GitHub: @andreyorst
- Email: email@example.com
- Telegram: @aorst
If you use Email you can optionally encrypt the message with the GPG key below.
GPG public key
-----BEGIN PGP PUBLIC KEY BLOCK----- mQINBF3NBvoBEACzPIWuduuZArvW5hGYz+BhebI1wLgkQSntsCPNt4UAIa6fYHAL yXCo/0DfpsrqLQ1h2G0ay4+s5TyLHkoQeWrWmxJuHsmzZ2WSg6Odc8TxMTzbkDTJ TBwPUyba0UVA8bHANkVPOV52BMhemeBMdRUDYU5ZgeaTCZHx0MDOHP/DMNKPsYRI VICUVclsy9eWQLN0zsPwKbV9MSW8FnTaQIrShFw35K07LyG7IixhjEc5cTrpiEmj ZRSkZZooG0pIHrI36182Gfu8khenbeNC2SBMeej/u3zGv8KrInJnV93UdYUTJBZb x5+81gvbvP+Fff9F49n77TGEJ4ig53rgzhNvpK8zBSC9zdqfTSFytDux3ID9QTf8 9L1LAkh0OONHEQPCLXa4ju7EpAZD9RNoLJfE6GIgSyxzkdCyPJREVt3a9pHKpT9D CQS5iH8R1d5FiophNF6+JgzxvhDDORphXMulLLEwbXZs4E8zAaDTX/lIm/uLVUo8 y6DpKNoO8BsLy54hcab+JZ4MMky8xNoY+oZjxVnXv8jpsJ8WZEmXRzZMl9BmJ6bu px1NJJFcM3KBK2FIwR0HBR11Oq22TAkDoeTj5VJqp8YOZbw7OnCwr20sPWwbLzSv P3gV0cfUNyLJ6tSFPLpC7ImgxTel0Wga3f7cHYlYmqCZ7NZlctOyuSA2PwARAQAB tCJBbmRyZXkgT3JzdCA8YW5kcmV5b3JzdEBnbWFpbC5jb20+iQJOBBMBCAA4FiEE XxucqJ8NyVDUiUBn7Xv1SrwQaNkFAl3NBvoCGwMFCwkIBwIGFQoJCAsCBBYCAwEC HgECF4AACgkQ7Xv1SrwQaNkfWg/7BSzzZFAhE0b1EDsq2Fnz8EBoxP5iCAtx5VRC +41p8KmcsC+Q27E0pAhvKGhXxURVeBgHG6rjcQUmigHkPT7XHhdNfzJcDx1H2FCL nbbXziPFWNKRi9fH5RmFbati8JrV2yGikVXKkhGRpxX2kcmPwowNL0Q+YenEleqj EYBRWXWgSfJIMfqitBQojbZ57wTDEVRbkybWlIj8+4wIQMI65SlRuy2eY2Tba5h9 LNggvx0NgW9TF3BUzBTqKu3ZMXVexTH4cLbvNeYpHcZ1U9uNjbI/NpVOJ3xYvocV dvChxlJEOZkJz4biniMeDDNHEvN9YAbM7fUZ+1zrUH9pghXi8FfiLFkWtt3d/Bt4 6hqcz7nLxx9kZMJ9wjROc4iuju5qODO5LPENkixzDDCxkAw6+G3Z5ZIqGUMZgT6v v/nsjA29VmEXVwkmiZxHHqG3b+P99SePTwg7GwWjICR9oJXdoVPLBFEFn1XgAOIu mIB9SMva/gzZ7pQLJsCBR8Z0bzFhYJnUm1PSwlNEBRts8kQbGn9UQ0QWPTVOXLbW efrM9R6/+aObAxzVetWdyEVmuL6TJMX14W27BVoZKmURehdljyP7jKHskY2nMsbt NDkYumC/IPfbsnPJEi+2s3W7yxKIydFYAmnjeyOBmB12PhLQgfstcNn73StT35DO +xpsyoW5Ag0EXc0G+gEQALZC6w+ayzKnkOHZxW8zLUOSjsxNCREoVYOZjbc6wfOW 4gOjGt4OfW7W41p9RMnMAS5ha58hEiWb9neWAtXKxOaIfJf5pGdU5x3Sjm/VtYaz h6vmByrpAvDGq3j7sZ+oBBH3KtUC53V7x14VFPSd7bmjQIibxX5tc2JWnGcTNb3G K48LyiayInGNmSFcbnZ1xDqpFnd/yB39DQsOxRZbvYsMCfP8RV7fnTVViNpJsqpI FfDiMU+twJBvnND1QrzNSz3VMJqEGjYqhqUk6d5IGTiR1AV3qa5PhtKj9O+QTWWs Dk9u6kS7iTETX9nn13kk61z5kKt1b4Cxv3HTxQLtmRzBN5O1lCx8r/daCubDfE1u 9pK9WkX2m32ong1xi2Lasu5E+uMzgU3XOWHTeXcDc+ilDt2s/trUGgUpkPhgab2c jgsOT09p4VGAQ53SMVs+xEWrOf5VYMyJESdNBO1dZbWGwN2EtM1uqF0uqTiD434/ N2R6TdlkqEdXL7hEyJm7X7wb8fNiFUFq+NSwE6L02KLWvuzXVnG3NIOTbXLbM3a1 8tgLno8QCgOusUQVAjRKoVH9tGlLK2KyOEuvctKreTqGrqFFw5l2+itRFXa/+A7p QUFod55GNQee6C4EWaE4IA3f6FrjvRdG3SQWHXMW4zh4ARwhgyJXlJO0+8KN6huF ABEBAAGJAjYEGAEIACAWIQRfG5yonw3JUNSJQGfte/VKvBBo2QUCXc0G+gIbDAAK CRDte/VKvBBo2ZneEACdVtpkveJ6EzbhdHvXewyMS4Z1d4kDwXlXbS1pfXsKsSW2 5Bguk3X/CJ3hDDFvgvUSeRY5Uegp+kHiMs1vzXryym4lNBrz4Hkl6ijV2TvktBR/ 4yysu3DEiWBYJY4EbG6YvYqWYn41suGCUeVVNRgy+9cbpvLoCLxmTXUHj6l1t5v7 rRQSmzRfsQuT+c3o3+7UamHLyGY68Mgsj4yvTOMWcYzF426Dw/KkxbsfTWQlL4Bu gakU0LJxz8QmB9Wrk0gz/73l3HPFr9DyJGsbQtGrTVq4730PjfhyyLfD4hltOXL6 CnalHsVMlOa+mRvv8w7b5I1Rsf8FRfNL+t1OW5EIxkVdbfh3MBNhbu9r2hhzPrEQ QV1hAQbPeW8AdWfiX+dk6XknTqQiA5E01PFgV5u0S6qqE12/T84UDz56aEv3vcQm y5o1zsogHQBtxqkaqSHr9aOSrCC2UWPutbzwko9jU6tbL6ICDdCjCw7YMKDpI1MM twRgCy/FyAsrVFrfm0Qa0xy++7Gph0UmcjF+qwKgszeg96/QLIleS8a5T4R4Owrl To7TKOJIKsxjeriaXO3WiFxe+IiYiDDBHXfqDglfhKlh9zUXXueIlR/zPctLWX9L 7RSIhxN91he+nB9AIr1dU5st9/lnWCRp6oSo/yfyqItPsMCDyObjR2aWO82QZw== =f4xj -----END PGP PUBLIC KEY BLOCK-----