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style: Add '--whole-file' option.

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* guix/scripts/style.scm (format-whole-file): New procedure.
(%options, show-help): Add '--whole-file'.
(guix-style): Honor it.
* tests/guix-style.sh: New file.
* Makefile.am (SH_TESTS): Add it.
* doc/guix.texi (Invoking guix style): Document it.
This commit is contained in:
Ludovic Courtès 2022-08-02 18:01:35 +02:00
parent 90ef692e9b
commit a15542d26d
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GPG Key ID: 090B11993D9AEBB5
4 changed files with 153 additions and 21 deletions
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1
Makefile.am
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@ -580,6 +580,7 @@ SH_TESTS = \
tests/guix-package.sh \
tests/guix-package-aliases.sh \
tests/guix-package-net.sh \
tests/guix-style.sh \
tests/guix-system.sh \
tests/guix-home.sh \
tests/guix-archive.sh \

28
doc/guix.texi
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@ -14058,9 +14058,12 @@ otherwise.
@node Invoking guix style
@section Invoking @command{guix style}
The @command{guix style} command helps packagers style their package
definitions according to the latest fashionable trends. The command
currently provides the following styling rules:
The @command{guix style} command helps users and packagers alike style
their package definitions and configuration files according to the
latest fashionable trends. It can either reformat whole files, with the
@option{--whole-file} option, or apply specific @dfn{styling rules} to
individual package definitions. The command currently provides the
following styling rules:
@itemize
@item
@ -14115,6 +14118,12 @@ the packages. The @option{--styling} or @option{-S} option allows you
to select the style rule, the default rule being @code{format}---see
below.
To reformat entire source files, the syntax is:
@example
guix style --whole-file @var{file}@dots{}
@end example
The available options are listed below.
@table @code
@ -14122,6 +14131,19 @@ The available options are listed below.
@itemx -n
Show source file locations that would be edited but do not modify them.
@item --whole-file
@itemx -f
Reformat the given files in their entirety. In that case, subsequent
arguments are interpreted as file names (rather than package names), and
the @option{--styling} option has no effect.
As an example, here is how you might reformat your operating system
configuration (you need write permissions for the file):
@example
guix style -f /etc/config.scm
@end example
@item --styling=@var{rule}
@itemx -S @var{rule}
Apply @var{rule}, one of the following styling rules:

65
guix/scripts/style.scm
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@ -328,6 +328,21 @@ PACKAGE."
(< (location-line loc1) (location-line loc2))
(string<? (location-file loc1) (location-file loc2))))))
;;;
;;; Whole-file formatting.
;;;
(define* (format-whole-file file #:rest rest)
"Reformat all of FILE."
(let ((lst (call-with-input-file file read-with-comments/sequence)))
(with-atomic-file-output file
(lambda (port)
(apply pretty-print-with-comments/splice port lst
#:format-comment canonicalize-comment
#:format-vertical-space canonicalize-vertical-space
rest)))))
;;;
;;; Options.
@ -345,6 +360,9 @@ PACKAGE."
(option '(#\e "expression") #t #f
(lambda (opt name arg result)
(alist-cons 'expression arg result)))
(option '(#\f "whole-file") #f #f
(lambda (opt name arg result)
(alist-cons 'whole-file? #t result)))
(option '(#\S "styling") #t #f
(lambda (opt name arg result)
(alist-cons 'styling-procedure
@ -400,6 +418,9 @@ Update package definitions to the latest style.\n"))
of 'silent', 'safe', or 'always'"))
(newline)
(display (G_ "
-f, --whole-file format the entire contents of the given file(s)"))
(newline)
(display (G_ "
-h, --help display this help and exit"))
(display (G_ "
-V, --version display version information and exit"))
@ -426,27 +447,35 @@ Update package definitions to the latest style.\n"))
#:build-options? #f))
(let* ((opts (parse-options))
(packages (filter-map (match-lambda
(('argument . spec)
(specification->package spec))
(('expression . str)
(read/eval str))
(_ #f))
opts))
(edit (if (assoc-ref opts 'dry-run?)
edit-expression/dry-run
edit-expression))
(style (assoc-ref opts 'styling-procedure))
(policy (assoc-ref opts 'input-simplification-policy)))
(with-error-handling
(for-each (lambda (package)
(style package #:policy policy
#:edit-expression edit))
;; Sort package by source code location so that we start editing
;; files from the bottom and going upward. That way, the
;; 'location' field of <package> records is not invalidated as
;; we modify files.
(sort (if (null? packages)
(fold-packages cons '() #:select? (const #t))
packages)
(negate package-location<?))))))
(if (assoc-ref opts 'whole-file?)
(let ((files (filter-map (match-lambda
(('argument . file) file)
(_ #f))
opts)))
(unless (eq? format-package-definition style)
(warning (G_ "'--styling' option has no effect in whole-file mode~%")))
(for-each format-whole-file files))
(let ((packages (filter-map (match-lambda
(('argument . spec)
(specification->package spec))
(('expression . str)
(read/eval str))
(_ #f))
opts)))
(for-each (lambda (package)
(style package #:policy policy
#:edit-expression edit))
;; Sort package by source code location so that we start
;; editing files from the bottom and going upward. That
;; way, the 'location' field of <package> records is not
;; invalidated as we modify files.
(sort (if (null? packages)
(fold-packages cons '() #:select? (const #t))
packages)
(negate package-location<?))))))))

80
tests/guix-style.sh Normal file
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@ -0,0 +1,80 @@
# GNU Guix --- Functional package management for GNU
# Copyright © 2022 Ludovic Courtès <ludo@gnu.org>
#
# This file is part of GNU Guix.
#
# GNU Guix is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or (at
# your option) any later version.
#
# GNU Guix is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
#
# Test 'guix style'.
#
set -e
guix style --version
tmpdir="guix-style-$$"
trap 'rm -r "$tmpdir"' EXIT
tmpfile="$tmpdir/os.scm"
mkdir "$tmpdir"
cat > "$tmpfile" <<EOF
;;; This is a header with three semicolons.
;;;
(define-module (foo bar)
#:use-module (guix)
#:use-module (gnu))
;; One blank line and a page break.
;; And now, the OS.
(operating-system
(host-name "komputilo")
(locale "eo_EO.UTF-8")
;; User accounts.
(users (cons (user-account
(name "alice")
(comment "Bob's sister")
(group "users")
;; Groups fit on one line.
(supplementary-groups '("wheel" "audio" "video")))
%base-user-accounts))
;; The services.
(services
(cons (service mcron-service-type) %base-services)))
EOF
cp "$tmpfile" "$tmpfile.bak"
initial_hash="$(guix hash "$tmpfile")"
guix style -f "$tmpfile"
if ! test "$initial_hash" = "$(guix hash "$tmpfile")"
then
cat "$tmpfile"
diff -u "$tmpfile.bak" "$tmpfile"
false
fi
# Introduce random changes and try again.
sed -i "$tmpfile" -e's/ +/ /g'
! test "$initial_hash" = "$(guix hash "$tmpfile")"
guix style -f "$tmpfile"
test "$initial_hash" = "$(guix hash "$tmpfile")"