https://idogawa.com/p/ Writings and tutorials by Andi Idogawa https://idogawa.com/p/2026/ruby-pptx.html https://idogawa.com/p/2026/ruby-pptx.html ruby_pptx is a Ruby port of python-pptx for creating, reading and updating PowerPoint (.pptx) files, with an API designed for Ruby. Tue, 29 Sep 2026 00:00:00 +0200 https://idogawa.com/p/2026/openssl-win-root.html https://idogawa.com/p/2026/openssl-win-root.html How the openssl-win-root gem feeds Windows root certificates to Ruby's OpenSSL, and my small part in its 1.1.2 release. Tue, 29 Sep 2026 00:00:00 +0200 https://idogawa.com/p/2026/ocran.html https://idogawa.com/p/2026/ocran.html OCRAN bundles your Ruby script, the interpreter and its gems into one executable, folder or zip for Windows, Linux and macOS. Tue, 29 Sep 2026 00:00:00 +0200 https://idogawa.com/p/2026/kumi.html https://idogawa.com/p/2026/kumi.html Kumi by André Muta is a declarative Ruby DSL for pricing, tax and scoring rules that compiles to plain Ruby and JavaScript. Tue, 29 Sep 2026 00:00:00 +0200 https://idogawa.com/p/2026/jsg.html https://idogawa.com/p/2026/jsg.html jsg is a small gem that scaffolds and builds ruby.wasm browser projects and adds a friendlier syntax on top of the js gem. Tue, 29 Sep 2026 00:00:00 +0200 https://idogawa.com/p/2026/file-exists-gem.html https://idogawa.com/p/2026/file-exists-gem.html What the file_exists gem does, how to use it, and when you should simply switch your code to File.exist? instead. Tue, 29 Sep 2026 00:00:00 +0200 https://idogawa.com/p/2026/clogs.html https://idogawa.com/p/2026/clogs.html clogs runs Shoes GUI programs on plain CRuby using libui, with no browser engine or JVM. It grew out of getting Hackety Hack to run again. Tue, 29 Sep 2026 00:00:00 +0200 https://idogawa.com/p/2025/106-key-japanese-keyboard-win11.html https://idogawa.com/p/2025/106-key-japanese-keyboard-win11.html How to use a 106-key Japanese keyboard on Windows 11 Wed, 30 Jul 2025 00:00:00 +0200 https://idogawa.com/p/2025/vs-code-hotkeys.html https://idogawa.com/p/2025/vs-code-hotkeys.html Master VS Code navigation and editing to boost your productivity Wed, 01 Jan 2025 00:00:00 +0100 https://idogawa.com/p/2024/01/glimmer-dsl-web-demo.html https://idogawa.com/p/2024/01/glimmer-dsl-web-demo.html Glimmer DSL for Web Demo static site demo Wed, 24 Jan 2024 00:00:00 +0100 https://idogawa.com/p/2024/01/svg-emoji-favicons.html https://idogawa.com/p/2024/01/svg-emoji-favicons.html A New Era for Browser Tabs Fri, 19 Jan 2024 00:00:00 +0100 https://idogawa.com/p/2024/01/git-diff-epub.html https://idogawa.com/p/2024/01/git-diff-epub.html Track epub, docx, pptx and sqlite files in Git Tue, 16 Jan 2024 00:00:00 +0100 https://idogawa.com/p/2023/08/invoice-template.html https://idogawa.com/p/2023/08/invoice-template.html A markdown and pandoc approach Fri, 25 Aug 2023 00:00:00 +0200 https://idogawa.com/p/2023/02/list-of-installed-windows-programs.html https://idogawa.com/p/2023/02/list-of-installed-windows-programs.html Wed, 01 Feb 2023 00:00:00 +0100 https://idogawa.com/p/2023/01/file-exists-ruby.html https://idogawa.com/p/2023/01/file-exists-ruby.html File.exists? and Dir.exists? were removed in Ruby 3.2. How to fix. Thu, 19 Jan 2023 00:00:00 +0100 https://idogawa.com/p/2023/01/less-tabs.html https://idogawa.com/p/2023/01/less-tabs.html Avoid tab bankruptcy Sat, 14 Jan 2023 00:00:00 +0100 https://idogawa.com/p/2023/01/compile-ruby-windows.html https://idogawa.com/p/2023/01/compile-ruby-windows.html Let's work on CRuby Sat, 14 Jan 2023 00:00:00 +0100 https://idogawa.com/p/2022/12/2022-the-year-english-became-a-programming-language.html https://idogawa.com/p/2022/12/2022-the-year-english-became-a-programming-language.html Making a ruby powered sticky notes app by typing a few sentences using ChatGPT. Sun, 18 Dec 2022 00:00:00 +0100 https://idogawa.com/p/2022/12/making-a-todo-app.html https://idogawa.com/p/2022/12/making-a-todo-app.html How the world is this possible? Sat, 17 Dec 2022 00:00:00 +0100 https://idogawa.com/p/2022/12/happy-endings-for-sad-movies.html https://idogawa.com/p/2022/12/happy-endings-for-sad-movies.html I don't like movies with sad endings. Let's make them happy! Fri, 09 Dec 2022 00:00:00 +0100 https://idogawa.com/p/2022/11/how-to-scan-schoolbooks.html https://idogawa.com/p/2022/11/how-to-scan-schoolbooks.html Wed, 23 Nov 2022 00:00:00 +0100 https://idogawa.com/p/2022/11/how-to-programm-in-python-on-your-phone.html https://idogawa.com/p/2022/11/how-to-programm-in-python-on-your-phone.html directly learn to code in python on your android phone or tablet! Sun, 20 Nov 2022 00:00:00 +0100 https://idogawa.com/p/2022/11/how-to-install-linux-on-android-using-termux.html https://idogawa.com/p/2022/11/how-to-install-linux-on-android-using-termux.html Use the linux commandline on your android phone or tablet! Sun, 20 Nov 2022 00:00:00 +0100 https://idogawa.com/p/2022/11/how-to-code-in-ruby-on-rails-on-android-phone.html https://idogawa.com/p/2022/11/how-to-code-in-ruby-on-rails-on-android-phone.html directly learn to code in ruby and ruby on rails on your android phone or tablet! Sun, 20 Nov 2022 00:00:00 +0100 https://idogawa.com/p/2022/11/how-to-code-in-php-on-android-phone.html https://idogawa.com/p/2022/11/how-to-code-in-php-on-android-phone.html directly learn to code in PHP on your android phone or tablet! Sun, 20 Nov 2022 00:00:00 +0100 https://idogawa.com/p/2022/11/edit-website-on-android-phone.html https://idogawa.com/p/2022/11/edit-website-on-android-phone.html Edit your website directly on your phone! Sun, 20 Nov 2022 00:00:00 +0100 https://idogawa.com/p/2022/11/what-the-heck-is-mastodon.html https://idogawa.com/p/2022/11/what-the-heck-is-mastodon.html Mastodon is basically Twitter meets E-Mail Addresses Tue, 15 Nov 2022 00:00:00 +0100 https://idogawa.com/p/2022/11/deploy-with-git.html https://idogawa.com/p/2022/11/deploy-with-git.html How to use git to push to your own server and have the working directory updated automatically. Wed, 02 Nov 2022 00:00:00 +0100 https://idogawa.com/p/2022/10/miyazaki-car-ferry/miyazaki-kobe-car-ferry.html https://idogawa.com/p/2022/10/miyazaki-car-ferry/miyazaki-kobe-car-ferry.html From Miyazaki to Kobe and back on a ship in style. Sun, 30 Oct 2022 00:00:00 +0200 https://idogawa.com/p/2022/06/taking-website-screenshots-with-ruby.html https://idogawa.com/p/2022/06/taking-website-screenshots-with-ruby.html You have a file with a list of urls and you want to screenshot each of those. Let's use ruby. Thu, 16 Jun 2022 00:00:00 +0200 https://idogawa.com/p/2022/01/kensington-expert-mouse-wireless-review.html https://idogawa.com/p/2022/01/kensington-expert-mouse-wireless-review.html Fri, 28 Jan 2022 00:00:00 +0100 https://idogawa.com/p/raspberry-pi/how-to-use-displaylink-raspberry-pi.html https://idogawa.com/p/raspberry-pi/how-to-use-displaylink-raspberry-pi.html Thu, 27 Jan 2022 00:00:00 +0100 https://idogawa.com/p/2021/12/programming-on-your-phone.html https://idogawa.com/p/2021/12/programming-on-your-phone.html Sat, 11 Dec 2021 00:00:00 +0100