{config, pkgs, callPackage, ... }: {
services.emacs.package = pkgs.emacs-unstable;
nixpkgs.overlays = [ (import (builtins.fetchTarball { url = "https://github.com/nix-community/emacs-overlay/archive/master.tar.gz"; })) ];
}
This configuration will enable this overlay, and define your system-wide emacs package as the =emacs-unstable= attribute it provides.
NOTE: Read the "Usage of the overlay" section below for further explanation of this configuration. This has the potential to break things, and will frequently trigger full source rebuilds of emacs.
If you want to enable daemon/server mode, add the following line to the same configuration:
services.emacs.enable = true;
It is recommended you read Nixpkgs and NixOS documentation on package overlays and overrides to familiarize yourself with the concepts:
** Contents of the overlay
This overlay consists of two overlays: =emacs= and =package=.
You can use both of them as a whole overlay or only one of them.
*** =package= overlay
**** Elpa Daily generations of Elpa.
**** Melpa / Melpa stable Daily generations of Melpa & Melpa stable attribute sets.
**** EXWM & needed dependencies This overlay provides fresh versions of EXWM and dependencies. This is updated daily.
*** =emacs= overlay
**** Emacs from Git and latest (including pre-releases) This overlay also provides two versions (latest from git) for Emacs. These are updated daily.
These attributes are named =emacs-git= and =emacs-unstable=. =emacs-git= is built from the latest =master= branch and =emacs-unstable= is built from the latest tag.
Emacs from git is not guaranteed stable and may break your setup at any time, if it breaks you get to keep both pieces.
We also provide two attributes named =emacs-git-nox= and =emacs-unstable-nox= if you wish to have Emacs built without X dependencies. =emacs-pgtk= uses the experimental pgtk feature which supports Wayland natively.
**** Extra library functionality This overlay comes with extra functions to generate an Emacs closure from various types of dependency declaration. (These are abstractions on top of =emacsWithPackages=.)
For example, =emacsWithPackagesFromUsePackage= adds packages which are required in a user's config via =use-package= or =leaf=.
{ pkgs, ... }: { environment.systemPackages = [ (pkgs.emacsWithPackagesFromUsePackage {
# supported.
# NB: Config files cannot contain unicode characters, since
# they're being parsed in nix, which lacks unicode
# support.
# config = ./emacs.org;
config = ./emacs.el;
# Whether to include your config as a default init file.
# If being bool, the value of config is used.
# Its value can also be a derivation like this if you want to do some
# substitution:
# defaultInitFile = pkgs.substituteAll {
# name = "default.el";
# src = ./emacs.el;
# inherit (config.xdg) configHome dataHome;
# };
defaultInitFile = true;
# Package is optional, defaults to pkgs.emacs
package = pkgs.emacs-git;
# By default emacsWithPackagesFromUsePackage will only pull in
# packages with `:ensure`, `:ensure t` or `:ensure <package name>`.
# Setting `alwaysEnsure` to `true` emulates `use-package-always-ensure`
# and pulls in all use-package references not explicitly disabled via
# `:ensure nil` or `:disabled`.
# Note that this is NOT recommended unless you've actually set
# `use-package-always-ensure` to `t` in your config.
alwaysEnsure = true;
# For Org mode babel files, by default only code blocks with
# `:tangle yes` are considered. Setting `alwaysTangle` to `true`
# will include all code blocks missing the `:tangle` argument,
# defaulting it to `yes`.
# Note that this is NOT recommended unless you have something like
# `#+PROPERTY: header-args:emacs-lisp :tangle yes` in your config,
# which defaults `:tangle` to `yes`.
alwaysTangle = true;
# Optionally provide extra packages not in the configuration file.
extraEmacsPackages = epkgs: [
epkgs.cask
];
# Optionally override derivations.
override = final: prev: {
weechat = prev.melpaPackages.weechat.overrideAttrs(old: {
patches = [ ./weechat-el.patch ];
});
};
})
];}
Similarly, =emacsWithPackagesFromPackageRequires= adds packages which are declared in a =.el= package file's =Package-Requires= header, which can be handy for CI purposes:
... let emacsForCI = pkgs.emacsWithPackagesFromPackageRequires { packageElisp = builtins.readFile ./flycheck.el; extraEmacsPackages = epkgs: [ epkgs.package-lint ]; }; pkgs.mkShell { buildInputs = [ emacsForCI ]; }
** Usage of the overlay *** Latest master each rebuild One way, and probably the most convenient way to pull in this overlay is by just fetching the tarball of latest master on rebuild.
This has side-effects if packages breaks or things like that you may want to be in control of which revision of the overlay you run.
Adding the overlay this way will extend your Emacs packages set to contain the latest EXWM and dependencies from their respective master and make the package =emacsGit= available. These of course change quite rapidly and will cause compilation time.
{ nixpkgs.overlays = [ (import (builtins.fetchTarball { url = "https://github.com/nix-community/emacs-overlay/archive/master.tar.gz"; })) ]; }
*** Binary cache You will want to use the [[https://nix-community.org/#binary-cache][nix-community binary cache]]. Where the overlay's build artefacts are pushed. See [[https://app.cachix.org/cache/nix-community][here]] for installation instructions.
*** Install directly from the overlay The repository is meant to be used as an overlay as is explained above. Still, for experimental purposes, you might want to install a package directly from the overlay. For example, you can install =emacsGit= from a clone of this repository with the following command:
nix-build --expr 'with (import
** Matrix chat [[https://matrix.to/#/#emacs:nixos.org][Nix Emacs]]