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We all know and love the MELPA package repository. At least we all know it, but not everyone loves the idea of using package snapshots. Some people would rather use only stable package releases and that’s understandable. Unfortunately the major community repository for stable packages Marmalade is often plagued by technical issues (that should be fixed once its elnode-powered rewrite is ready) and

A couple of years ago I lamented over the lack of frame focus hooks in Emacs. This prohibited us from implemented a feature like IntelliJ IDEA’s “auto-save on focus lost”, which was kind of frustrating as we’re generally assuming that everything is doable in Emacs! All this changes in Emacs 24.4 with the introduction of two new hooks - focus-in-hook and focus-out-hook. The first is triggered when

I’m extremely fond of rectangle editing (the ability to select a rectangular region and apply editing commands only to it), but I’ve always disliked the fact there was no way to visually highlight the exact rectangle region you’ve currently selected. Let’s delete some text in a rectangular region (with C-x r d), so you can see where the problem lies: It’s not immediately clear where the rectangle

Emacs has two helpful features, called auto-backup and auto-save (or at least I call them this way). Auto-backup is triggered when you save a file - it will keep the old version of the file around, adding a ~ to its name. So if you saved the file foo, you’d get foo~ as well. auto-save-mode auto-saves a file every few seconds or every few characters (both settings are configurable - auto-save-inter

Some time ago I wrote about highlighting matching parentheses with show-paren-mode. This is definitely useful, but it’s kind of restrictive, since parentheses are just a specific kind of paired delimiter. Single and double quotes are also paired delimiters (at least in most programmming languages). In the Ruby programmming language, for instance, do and end also constitute paired delimiter. smartp

Posts Jun 3, 2025 Tree-sitter powered code completion Tree-sitter has taken the world of programming by a storm. Together with LSP, it’s probably the technology that has influenced the most programming editors and IDEs in the past several years. And now that Emacs 29+ comes with built-in Tree-sitter support I’ve been spending a lot of quality time with it, working on clojure-ts-mode and neocaml-mo