To get up and running quickly, add the following lines to your /etc/nixos/configuration.nix:
{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:
This overlay consists of two overlays: emacs and package.
You can use both of them as a whole overlay or only one of them.
Daily generations of Elpa.
Daily generations of Melpa & Melpa stable attribute sets.
This overlay provides fresh versions of EXWM and dependencies. This is updated daily.
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.
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 {
# Your Emacs config file. Org mode babel files are also
# 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 ];
}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";
}))
];
}You will want to use the nix-community binary cache. Where the overlay’s build artefacts are pushed. See here for installation instructions.
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 <nixpkgs> { overlays = [ (import ./.) ]; }); emacs-git'