621 lines
22 KiB
XML
621 lines
22 KiB
XML
<chapter xmlns="http://docbook.org/ns/docbook"
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xmlns:xlink="http://www.w3.org/1999/xlink"
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xmlns:xi="http://www.w3.org/2001/XInclude"
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version="5.0"
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xml:id="module-services-emacs">
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<title>Emacs</title>
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<!--
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Documentation contributors:
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Damien Cassou @DamienCassou
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Thomas Tuegel @ttuegel
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Rodney Lorrimar @rvl
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-->
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<para>
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<link xlink:href="http://www.gnu.org/software/emacs/">Emacs</link>
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is an extensible, customizable, self-documenting real-time display
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editor — and more. At its core is an interpreter for Emacs Lisp, a
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dialect of the Lisp programming language with extensions to
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support text editing.
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</para>
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<para>
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Emacs runs within a graphical desktop environment using the X
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Window System, but works equally well on a text terminal. Under
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<productname>macOS</productname>, a "Mac port" edition is
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available, which uses Apple's native GUI frameworks.
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</para>
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<para>
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<productname>Nixpkgs</productname> provides a superior environment
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for running <application>Emacs</application>. It's simple to
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create custom builds by overriding the default packages. Chaotic
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collections of Emacs Lisp code and extensions can be brought under
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control using declarative package
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management. <productname>NixOS</productname> even provides a
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<command>systemd</command> user service for automatically
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starting the Emacs daemon.
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</para>
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<section xml:id="module-services-emacs-installing">
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<title>Installing <application>Emacs</application></title>
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<para>
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Emacs can be installed in the normal way for Nix (see
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<xref linkend="sec-package-management" />).
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In addition, a NixOS <emphasis>service</emphasis>
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can be enabled.
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</para>
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<section xml:id="module-services-emacs-releases">
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<title>The Different Releases of Emacs</title>
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<para>
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<productname>Nixpkgs</productname> defines several basic Emacs
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packages. The following are attributes belonging to the
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<varname>pkgs</varname> set:
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<variablelist>
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<varlistentry>
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<term><varname>emacs</varname></term>
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<term><varname>emacs25</varname></term>
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<listitem>
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<para>
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The latest stable version of Emacs 25 using the <link
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xlink:href="http://www.gtk.org">GTK+ 2</link> widget
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toolkit.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>emacs25-nox</varname></term>
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<listitem>
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<para>
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Emacs 25 built without any dependency on X11
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libraries.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>emacsMacport</varname></term>
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<term><varname>emacs25Macport</varname></term>
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<listitem>
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<para>
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Emacs 25 with the "Mac port" patches, providing a more
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native look and feel under macOS.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</para>
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<para>
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If those aren't suitable, then the following imitation Emacs
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editors are also available in Nixpkgs:
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<link xlink:href="https://www.gnu.org/software/zile/">Zile</link>,
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<link xlink:href="http://homepage.boetes.org/software/mg/">mg</link>,
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<link xlink:href="http://yi-editor.github.io/">Yi</link>.
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</para>
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</section>
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<section xml:id="module-services-emacs-adding-packages">
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<title>Adding Packages to Emacs</title>
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<para>
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Emacs includes an entire ecosystem of functionality beyond
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text editing, including a project planner, mail and news
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reader, debugger interface, calendar, and more.
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</para>
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<para>
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Most extensions are gotten with the Emacs packaging system
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(<filename>package.el</filename>) from <link
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xlink:href="https://elpa.gnu.org/">Emacs Lisp Package Archive
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(<acronym>ELPA</acronym>)</link>,
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<link xlink:href="https://melpa.org/"><acronym>MELPA</acronym></link>,
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<link xlink:href="https://stable.melpa.org/">MELPA Stable</link>,
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and <link xlink:href="http://orgmode.org/elpa.html">Org ELPA</link>.
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Nixpkgs is regularly updated to mirror all these archives.
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</para>
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<para>
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Under NixOS, you can continue to use
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<function>package-list-packages</function> and
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<function>package-install</function> to install packages. You
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can also declare the set of Emacs packages you need using the
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derivations from Nixpkgs. The rest of this section discusses
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declarative installation of Emacs packages through nixpkgs.
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</para>
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<note>
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<para>
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This documentation describes the new Emacs packages
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framework in NixOS 16.03
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(<varname>emacsPackagesNg</varname>) which should not be
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confused with the previous and deprecated framework
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(<varname>emacs24Packages</varname>).
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</para>
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</note>
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<para>
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The first step to declare the list of packages you want in
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your Emacs installation is to create a dedicated
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derivation. This can be done in a dedicated
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<filename>emacs.nix</filename> file such as:
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<example xml:id="ex-emacsNix">
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<title>Nix expression to build Emacs with packages (<filename>emacs.nix</filename>)</title>
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<programlisting language="nix">
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/*
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This is a nix expression to build Emacs and some Emacs packages I like
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from source on any distribution where Nix is installed. This will install
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all the dependencies from the nixpkgs repository and build the binary files
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without interfering with the host distribution.
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To build the project, type the following from the current directory:
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$ nix-build emacs.nix
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To run the newly compiled executable:
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$ ./result/bin/emacs
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*/
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{ pkgs ? import <nixpkgs> {} }: <co xml:id="ex-emacsNix-1" />
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let
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myEmacs = pkgs.emacs; <co xml:id="ex-emacsNix-2" />
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emacsWithPackages = (pkgs.emacsPackagesNgGen myEmacs).emacsWithPackages; <co xml:id="ex-emacsNix-3" />
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in
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emacsWithPackages (epkgs: (with epkgs.melpaStablePackages; [ <co xml:id="ex-emacsNix-4" />
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magit # ; Integrate git <C-x g>
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zerodark-theme # ; Nicolas' theme
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]) ++ (with epkgs.melpaPackages; [ <co xml:id="ex-emacsNix-5" />
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undo-tree # ; <C-x u> to show the undo tree
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zoom-frm # ; increase/decrease font size for all buffers %lt;C-x C-+>
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]) ++ (with epkgs.elpaPackages; [ <co xml:id="ex-emacsNix-6" />
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auctex # ; LaTeX mode
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beacon # ; highlight my cursor when scrolling
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nameless # ; hide current package name everywhere in elisp code
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]) ++ [
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pkgs.notmuch # From main packages set <co xml:id="ex-emacsNix-7" />
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])
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</programlisting>
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</example>
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<calloutlist>
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<callout arearefs="ex-emacsNix-1">
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<para>
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The first non-comment line in this file
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(<literal>{ pkgs ? ... }</literal>)
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indicates that the whole file represents a function.
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</para>
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</callout>
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<callout arearefs="ex-emacsNix-2">
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<para>
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The <varname>let</varname> expression below defines a
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<varname>myEmacs</varname> binding pointing to the current
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stable version of Emacs. This binding is here to separate the
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choice of the Emacs binary from the specification of the
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required packages.
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</para>
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</callout>
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<callout arearefs="ex-emacsNix-3">
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<para>
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This generates an <varname>emacsWithPackages</varname>
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function. It takes a single argument: a function from a
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package set to a list of packages (the packages that will
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be available in Emacs).
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</para>
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</callout>
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<callout arearefs="ex-emacsNix-4">
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<para>
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The rest of the file specifies the list of packages to
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install. In the example, two packages
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(<varname>magit</varname> and
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<varname>zerodark-theme</varname>) are taken from MELPA
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stable.
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</para>
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</callout>
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<callout arearefs="ex-emacsNix-5">
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<para>
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Two packages (<varname>undo-tree</varname> and
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<varname>zoom-frm</varname>) are taken from MELPA.
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</para>
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</callout>
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<callout arearefs="ex-emacsNix-6">
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<para>Three packages are taken from GNU ELPA.</para>
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</callout>
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<callout arearefs="ex-emacsNix-7">
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<para>
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<varname>notmuch</varname> is taken from a nixpkgs derivation
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which contains an Emacs mode.
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</para>
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</callout>
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</calloutlist>
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</para>
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<para>
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The result of this configuration will be an
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<command>emacs</command> command which launches Emacs with all
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of your chosen packages in the <varname>load-path</varname>.
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</para>
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<para>
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You can check that it works by executing this in a terminal:
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<screen>
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$ nix-build emacs.nix
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$ ./result/bin/emacs -q
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</screen>
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and then typing <literal>M-x package-initialize</literal>.
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Check that you can use all the packages you want in this
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Emacs instance. For example, try switching to the zerodark
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theme through
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<literal>M-x load-theme <RET> zerodark <RET> y</literal>.
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</para>
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<tip>
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<para>
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A few popular extensions worth checking out are: auctex,
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company, edit-server, flycheck, helm, iedit, magit,
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multiple-cursors, projectile, and yasnippet.
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</para>
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</tip>
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<para>
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The list of available packages in the various ELPA
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repositories can be seen with the following commands:
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<example xml:id="module-services-emacs-querying-packages">
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<title>Querying Emacs packages</title>
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<programlisting><![CDATA[
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nix-env -f "<nixpkgs>" -qaP -A emacsPackagesNg.elpaPackages
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nix-env -f "<nixpkgs>" -qaP -A emacsPackagesNg.melpaPackages
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nix-env -f "<nixpkgs>" -qaP -A emacsPackagesNg.melpaStablePackages
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nix-env -f "<nixpkgs>" -qaP -A emacsPackagesNg.orgPackages
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]]></programlisting>
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</example>
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</para>
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<para>
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If you are on NixOS, you can install this particular Emacs for
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all users by adding it to the list of system packages
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(see <xref linkend="sec-declarative-package-mgmt" />). Simply
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modify your file <filename>configuration.nix</filename> to
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make it contain:
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<example xml:id="module-services-emacs-configuration-nix">
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<title>Custom Emacs in <filename>configuration.nix</filename></title>
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<programlisting><![CDATA[
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{
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environment.systemPackages = [
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# [...]
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(import /path/to/emacs.nix { inherit pkgs; })
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];
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}
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]]></programlisting>
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</example>
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</para>
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<para>
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In this case, the next <command>nixos-rebuild switch</command>
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will take care of adding your <command>emacs</command> to the
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<varname>PATH</varname> environment variable
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(see <xref linkend="sec-changing-config" />).
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</para>
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<!-- fixme: i think the following is better done with config.nix
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https://nixos.org/nixpkgs/manual/#sec-modify-via-packageOverrides
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-->
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<para>
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If you are not on NixOS or want to install this particular
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Emacs only for yourself, you can do so by adding it to your
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<filename>~/.config/nixpkgs/config.nix</filename>
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(see <link xlink:href="http://nixos.org/nixpkgs/manual/#sec-modify-via-packageOverrides">Nixpkgs manual</link>):
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<example xml:id="module-services-emacs-config-nix">
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<title>Custom Emacs in <filename>~/.config/nixpkgs/config.nix</filename></title>
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<programlisting><![CDATA[
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{
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packageOverrides = super: let self = super.pkgs; in {
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myemacs = import /path/to/emacs.nix { pkgs = self; };
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};
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}
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]]></programlisting>
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</example>
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</para>
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<para>
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In this case, the next
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<literal>nix-env -f '<nixpkgs>' -iA myemacs</literal>
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will take care of adding your emacs to the
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<varname>PATH</varname> environment variable.
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</para>
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</section>
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<section xml:id="module-services-emacs-advanced">
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<title>Advanced Emacs Configuration</title>
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<para>
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If you want, you can tweak the Emacs package itself from your
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<filename>emacs.nix</filename>. For example, if you want to
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have a GTK+3-based Emacs instead of the default GTK+2-based
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binary and remove the automatically generated
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<filename>emacs.desktop</filename> (useful is you only use
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<command>emacsclient</command>), you can change your file
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<filename>emacs.nix</filename> in this way:
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</para>
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<example xml:id="ex-emacsGtk3Nix">
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<title>Custom Emacs build</title>
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<programlisting><![CDATA[
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{ pkgs ? import <nixpkgs> {} }:
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let
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myEmacs = (pkgs.emacs.override {
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# Use gtk3 instead of the default gtk2
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withGTK3 = true;
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withGTK2 = false;
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}).overrideAttrs (attrs: {
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# I don't want emacs.desktop file because I only use
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# emacsclient.
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postInstall = (attrs.postInstall or "") + ''
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rm $out/share/applications/emacs.desktop
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'';
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});
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in [...]
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]]></programlisting>
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</example>
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<para>
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After building this file as shown in <xref linkend="ex-emacsNix" />,
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you will get an GTK3-based Emacs binary pre-loaded with your
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favorite packages.
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</para>
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</section>
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</section>
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<section xml:id="module-services-emacs-running">
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<title>Running Emacs as a Service</title>
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<para>
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<productname>NixOS</productname> provides an optional
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<command>systemd</command> service which launches
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<link xlink:href="https://www.gnu.org/software/emacs/manual/html_node/emacs/Emacs-Server.html">
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Emacs daemon
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</link>
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with the user's login session.
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</para>
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<para>
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<emphasis>Source:</emphasis>
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<filename>modules/services/editors/emacs.nix</filename>
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</para>
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<section xml:id="module-services-emacs-enabling">
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<title>Enabling the Service</title>
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<para>
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To install and enable the <command>systemd</command>
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user service for Emacs daemon, add the following to your
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<filename>configuration.nix</filename>:
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<programlisting>
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<xref linkend="opt-services.emacs.enable"/> = true;
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<xref linkend="opt-services.emacs.package"/> = import /home/cassou/.emacs.d { pkgs = pkgs; };
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</programlisting>
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</para>
|
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<para>
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The <varname>services.emacs.package</varname> option allows a
|
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custom derivation to be used, for example, one created by
|
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<function>emacsWithPackages</function>.
|
|
</para>
|
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<para>
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Ensure that the Emacs server is enabled for your user's Emacs
|
|
configuration, either by customizing the
|
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<varname>server-mode</varname> variable, or by adding
|
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<literal>(server-start)</literal> to
|
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<filename>~/.emacs.d/init.el</filename>.
|
|
</para>
|
|
|
|
<para>
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To start the daemon, execute the following:
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<screen>
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$ nixos-rebuild switch # to activate the new configuration.nix
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$ systemctl --user daemon-reload # to force systemd reload
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$ systemctl --user start emacs.service # to start the Emacs daemon
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</screen>
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The server should now be ready to serve Emacs clients.
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</para>
|
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</section>
|
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|
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<section xml:id="module-services-emacs-starting-client">
|
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<title>Starting the client</title>
|
|
<para>
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|
Ensure that the emacs server is enabled, either by customizing
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the <varname>server-mode</varname> variable, or by adding
|
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<literal>(server-start)</literal> to
|
|
<filename>~/.emacs</filename>.
|
|
</para>
|
|
|
|
<para>
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|
To connect to the emacs daemon, run one of the following:
|
|
<programlisting><![CDATA[
|
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emacsclient FILENAME
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emacsclient --create-frame # opens a new frame (window)
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|
emacsclient --create-frame --tty # opens a new frame on the current terminal
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]]></programlisting>
|
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</para>
|
|
</section>
|
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|
|
<section xml:id="module-services-emacs-editor-variable">
|
|
<title>Configuring the <varname>EDITOR</varname> variable</title>
|
|
<!--<title><command>emacsclient</command> as the Default Editor</title>-->
|
|
|
|
<para>
|
|
If <xref linkend="opt-services.emacs.defaultEditor"/> is
|
|
<literal>true</literal>, the <varname>EDITOR</varname> variable
|
|
will be set to a wrapper script which launches
|
|
<command>emacsclient</command>.
|
|
</para>
|
|
|
|
<para>
|
|
Any setting of <varname>EDITOR</varname> in the shell config
|
|
files will override
|
|
<varname>services.emacs.defaultEditor</varname>.
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|
To make sure <varname>EDITOR</varname> refers to the Emacs
|
|
wrapper script, remove any existing <varname>EDITOR</varname>
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assignment from <filename>.profile</filename>,
|
|
<filename>.bashrc</filename>, <filename>.zshenv</filename> or
|
|
any other shell config file.
|
|
</para>
|
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|
|
<para>
|
|
If you have formed certain bad habits when editing files,
|
|
these can be corrected with a shell alias to the wrapper
|
|
script:
|
|
<programlisting>alias vi=$EDITOR</programlisting>
|
|
</para>
|
|
</section>
|
|
|
|
<section xml:id="module-services-emacs-per-user">
|
|
<title>Per-User Enabling of the Service</title>
|
|
|
|
<para>
|
|
In general, <command>systemd</command> user services
|
|
are globally enabled by symlinks in
|
|
<filename>/etc/systemd/user</filename>. In the case where
|
|
Emacs daemon is not wanted for all users, it is possible to
|
|
install the service but not globally enable it:
|
|
|
|
<programlisting>
|
|
<xref linkend="opt-services.emacs.enable"/> = false;
|
|
<xref linkend="opt-services.emacs.install"/> = true;
|
|
</programlisting>
|
|
</para>
|
|
|
|
<para>
|
|
To enable the <command>systemd</command> user service for just
|
|
the currently logged in user, run:
|
|
|
|
<programlisting>systemctl --user enable emacs</programlisting>
|
|
|
|
This will add the symlink
|
|
<filename>~/.config/systemd/user/emacs.service</filename>.
|
|
</para>
|
|
</section>
|
|
</section>
|
|
|
|
<section xml:id="module-services-emacs-configuring">
|
|
<title>Configuring Emacs</title>
|
|
|
|
<para>
|
|
The Emacs init file should be changed to load the extension
|
|
packages at startup:
|
|
|
|
<example xml:id="module-services-emacs-package-initialisation">
|
|
<title>Package initialization in <filename>.emacs</filename></title>
|
|
<programlisting><![CDATA[
|
|
(require 'package)
|
|
|
|
;; optional. makes unpure packages archives unavailable
|
|
(setq package-archives nil)
|
|
|
|
(setq package-enable-at-startup nil)
|
|
(package-initialize)
|
|
]]></programlisting>
|
|
</example>
|
|
</para>
|
|
|
|
<para>
|
|
After the declarative emacs package configuration has been
|
|
tested, previously downloaded packages can be cleaned up by
|
|
removing <filename>~/.emacs.d/elpa</filename> (do make a backup
|
|
first, in case you forgot a package).
|
|
</para>
|
|
|
|
<!--
|
|
todo: is it worth documenting customizations for
|
|
server-switch-hook, server-done-hook?
|
|
-->
|
|
|
|
<section xml:id="module-services-emacs-major-mode">
|
|
<title>A Major Mode for Nix Expressions</title>
|
|
|
|
<para>
|
|
Of interest may be <varname>melpaPackages.nix-mode</varname>,
|
|
which provides syntax highlighting for the Nix language. This is
|
|
particularly convenient if you regularly edit Nix files.
|
|
</para>
|
|
</section>
|
|
|
|
<section xml:id="module-services-emacs-man-pages">
|
|
<title>Accessing man pages</title>
|
|
<para>
|
|
You can use <function>woman</function> to get completion of all
|
|
available man pages. For example, type <literal>M-x woman
|
|
<RET> nixos-rebuild <RET>.</literal>
|
|
</para>
|
|
</section>
|
|
|
|
<section xml:id="sec-emacs-docbook-xml">
|
|
<title>Editing DocBook 5 XML Documents</title>
|
|
<para>
|
|
Emacs includes <link
|
|
xlink:href="https://www.gnu.org/software/emacs/manual/html_node/nxml-mode/Introduction.html">nXML</link>,
|
|
a major-mode for validating and editing XML documents.
|
|
When editing DocBook 5.0 documents, such as
|
|
<link linkend="book-nixos-manual">this one</link>,
|
|
nXML needs to be configured with the relevant schema, which is
|
|
not included.
|
|
</para>
|
|
|
|
<para>
|
|
To install the DocBook 5.0 schemas, either add
|
|
<varname>pkgs.docbook5</varname> to
|
|
<xref linkend="opt-environment.systemPackages"/> (<link
|
|
linkend="sec-declarative-package-mgmt">NixOS</link>), or run
|
|
<literal>nix-env -i pkgs.docbook5</literal>
|
|
(<link linkend="sec-ad-hoc-packages">Nix</link>).
|
|
</para>
|
|
|
|
<para>
|
|
Then customize the variable <varname>rng-schema-locating-files</varname> to include <filename>~/.emacs.d/schemas.xml</filename> and put the following text into that file:
|
|
<example xml:id="ex-emacs-docbook-xml">
|
|
<title>nXML Schema Configuration (<filename>~/.emacs.d/schemas.xml</filename>)</title>
|
|
<programlisting language="xml"><![CDATA[
|
|
<?xml version="1.0"?>
|
|
<!--
|
|
To let emacs find this file, evaluate:
|
|
(add-to-list 'rng-schema-locating-files "~/.emacs.d/schemas.xml")
|
|
-->
|
|
<locatingRules xmlns="http://thaiopensource.com/ns/locating-rules/1.0">
|
|
<!--
|
|
Use this variation if pkgs.docbook5 is added to environment.systemPackages
|
|
-->
|
|
<namespace ns="http://docbook.org/ns/docbook"
|
|
uri="/run/current-system/sw/share/xml/docbook-5.0/rng/docbookxi.rnc"/>
|
|
<!--
|
|
Use this variation if installing schema with "nix-env -iA pkgs.docbook5".
|
|
<namespace ns="http://docbook.org/ns/docbook"
|
|
uri="../.nix-profile/share/xml/docbook-5.0/rng/docbookxi.rnc"/>
|
|
-->
|
|
</locatingRules>
|
|
]]></programlisting>
|
|
</example>
|
|
</para>
|
|
|
|
</section>
|
|
</section>
|
|
|
|
</chapter>
|