If you're creating a new elisp package, legalese: https://github.com/jorgenschaefer/legalese is a great tool. It ensures all your headers are set up correctly.
miniblog.
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TIL Advent of Code and Project Euler will deliberately look for puzzles where the naive solution is worse than quadratic.
This ensures that people can solve them with any programming language. You don't want fast languages to be able to use the naive solution.
tagref is a cute tool where you write `// see [tag:foo] and it ensures that `[tag:foo]` actually exists somewhere in your codebase.
Today I learnt that Arch Linux has a paccache.timer built-in service. This service (you can enable it from systemctl) ensures your package cache doesn't grow excessively.
Really handy, though I wonder why it isn't enabled by default.