style: Add '--styling' option.

* guix/scripts/style.scm (format-package-definition): New procedure.
(%options, show-help): Add "--styling".
(%default-options): Add 'styling-procedure'.
(guix-style): Honor it.
* tests/style.scm (with-test-package)
("input labels, 'safe' policy")
("input labels, 'safe' policy, nothing changed")
("input labels, margin comment")
("input labels, margin comment on long list")
("input labels, line comment")
("input labels, modify-inputs and margin comment"): Pass "-S inputs".
* etc/indent-code.el: Remove.
* doc/contributing.texi (Formatting Code): Mention "guix style" instead
of "etc/indent-code.el".
(Submitting Patches): Add item for "guix style".
* doc/guix.texi (Invoking guix style): Document "-S" and update.

1 files changed, 8 insertions, 10 deletions

diff --git a/doc/contributing.texi b/doc/contributing.texi
index 72f5ce1e0e..9f97788c0b 100644
--- a/doc/contributing.texi
+++ b/doc/contributing.texi
@@ -959,17 +959,11 @@ If you do not use Emacs, please make sure to let your editor knows these
 rules.  To automatically indent a package definition, you can also run:
 
 @example
-./etc/indent-code.el gnu/packages/@var{file}.scm @var{package}
+./pre-inst-env guix style @var{package}
 @end example
 
 @noindent
-This automatically indents the definition of @var{package} in
-@file{gnu/packages/@var{file}.scm} by running Emacs in batch mode.  To
-indent a whole file, omit the second argument:
-
-@example
-./etc/indent-code.el gnu/services/@var{file}.scm
-@end example
+@xref{Invoking guix style}, for more information.
 
 @cindex Vim, Scheme code editing
 If you are editing code with Vim, we recommend that you run @code{:set
@@ -1039,6 +1033,10 @@ name of the new or modified package, and fix any errors it reports
 (@pxref{Invoking guix lint}).
 
 @item
+Run @code{guix style @var{package}} to format the new package definition
+according to the project's conventions (@pxref{Invoking guix style}).
+
+@item
 Make sure the package builds on your platform, using @code{guix build
 @var{package}}.
 
@@ -1175,8 +1173,8 @@ Examples of unrelated changes include the addition of several packages,
 or a package update along with fixes to that package.
 
 @item
-Please follow our code formatting rules, possibly running the
-@command{etc/indent-code.el} script to do that automatically for you
+Please follow our code formatting rules, possibly running
+@command{guix style} script to do that automatically for you
 (@pxref{Formatting Code}).
 
 @item