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doc: Add Emacs packaging guidelines.

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* doc/contributing.texi (Emacs Packages): New subsection.
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Maxim Cournoyer 2020-12-16 14:31:12 -05:00
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@ -391,6 +391,7 @@ needed is to review and apply the patch.
* Version Numbers:: When the name is not enough.
* Synopses and Descriptions:: Helping users find the right package.
* Snippets versus Phases:: Whether to use a snippet, or a build phase.
* Emacs Packages:: Your Elisp fix.
* Python Modules:: A touch of British comedy.
* Perl Modules:: Little pearls.
* Java Packages:: Coffee break.
@ -636,6 +637,46 @@ embed store items in the sources; such patching should rather be done
using build phases. Refer to the @code{origin} record documentation for
more information (@pxref{origin Reference}).
@node Emacs Packages
@subsection Emacs Packages
@cindex emacs, packaging
@cindex elisp, packaging
Emacs packages should preferably use the Emacs build system
(@pxref{emacs-build-system}), for uniformity and the benefits provided
by its build phases, such as the auto-generation of the autoloads file
and the byte compilation of the sources. Because there are no
standardized way to run a test suite for Emacs packages, tests are
disabled by default. When a test suite is available, it should be
enabled by setting the @code{#:tests?} argument to @code{#true}. By
default, the command to run the test is @command{make check}, but any
command can be specified via the @code{#:test-command} argument. The
@code{#:test-command} argument expects a list containing a command and
its arguments, to be invoked during the @code{'check} phase.
The Elisp dependencies of Emacs packages are typically provided as
@code{propagated-inputs} when required at run time. As for other
packages, build or test dependencies should be specified as
@code{native-inputs}.
Emacs packages sometimes depend on resources directories that should be
installed along the Elisp files. The @code{#:include} argument can be
used for that purpose, by specifying a list of regexps to match. The
best practice when using the @code{#:include} argument is to extend
rather than override its default value (accessible via the
@code{%default-include} variable). As an example, a yasnippet extension
package typically include a @file{snippets} directory, which could be
copied to the installation directory using:
@lisp
#:include (cons "^snippets/" %default-include))
@end lisp
When encountering problems, it is wise to check for the presence of the
@code{Package-Requires} extension header in the package main source
file, and whether any dependencies and their versions listed therein are
satisfied.
@node Python Modules
@subsection Python Modules

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doc/guix.texi
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@ -7930,6 +7930,7 @@ Which D compiler is used can be specified with the @code{#:ldc}
parameter which defaults to @code{ldc}.
@end defvr
@anchor{emacs-build-system}
@defvr {Scheme Variable} emacs-build-system
This variable is exported by @code{(guix build-system emacs)}. It
implements an installation procedure similar to the packaging system