Hydra may refer to:

See the sections below for more information.

Hydra, the keybinding package

Project page: https://github.com/abo-abo/hydra

Hydra allows you to create keymaps for related commands, with the ability to easily repeat commands by using a single keystroke. Here is a small example:

    (defhydra hydra-zoom (global-map "<f2>")
      ("g" text-scale-increase "in")
      ("l" text-scale-decrease "out"))

With this code, typing `<f2> g g g’ would increase the text size by three steps.


Hydra, the Nix-based continuous build system

View the Continuous Integration status of Emacs at http://hydra.nixos.org/jobset/gnu/emacs-trunk, or the emacs-buildstatus mailing list archive.

You can find other Emacs branches at http://hydra.nixos.org/project/gnu .

See Glenn Morris’s description of the Hydra interface at http://lists.gnu.org/archive/html/emacs-devel/2013-09/msg00205.html

GnuEmacs CategoryBuilding EmacsImplementations