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Emacs: Completion in the buffer with completion-at-point-functions

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Source: Protesilaos Stavrou
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  • description: In this ~22-minute video I explain how Emacs performs completion in a buffer. I cover what happens behind the scenes with the variable completion-at-point-functions. Then I also go to the frontends, which affects the modalities of interaction. I cover the built-in Completions buffer, the packages Corfu and Company, and the built-in completion-preview-mode. Finally, I comment at some further length on how to control the grouping of results in the completion-at-point-functions. In that context I also mention the Cape package, as well as some extra functionality that the Company package provide. I wrote an article which covers all of what is in the video as well as code samples. You can read it on my website here: https://protesilaos.com/codelog/2026-07-19-emacs-completion-at-point-functions/
  • title: Emacs: Completion in the buffer with completion-at-point-functions
  • id: 3472377
  • duration_seconds: 1372
  • updated_at: 2026-07-21T02:00:45Z
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