* [bug#61266] [PATCH 1/1] lint: Add unused-modules linter.
@ 2023-02-04 5:59 Reily Siegel
2023-02-11 23:55 ` Ludovic Courtès
0 siblings, 1 reply; 4+ messages in thread
From: Reily Siegel @ 2023-02-04 5:59 UTC (permalink / raw)
To: 61266
* guix/lint.scm (file-module): New function.
(module-dependencies): New function.
(sexp-symbols): New function.
(file-symbols): New function.
(report-unused-module): New function.
(check-unused-modules): New function.
(%local-checkers): Add check-unused-modules.
---
guix/lint.scm | 64 ++++++++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 63 insertions(+), 1 deletion(-)
diff --git a/guix/lint.scm b/guix/lint.scm
index 8e3976171f..38c8595bd6 100644
--- a/guix/lint.scm
+++ b/guix/lint.scm
@@ -14,6 +14,7 @@
;;; Copyright © 2021 Xinglu Chen <public@yoctocell.xyz>
;;; Copyright © 2021, 2022 Maxime Devos <maximedevos@telenet.be>
;;; Copyright © 2021 Brice Waegeneire <brice@waegenei.re>
+;;; Copyright © 2023 Reily Siegel <mail@reilysiegel.com>
;;;
;;; This file is part of GNU Guix.
;;;
@@ -37,6 +38,7 @@ (define-module (guix lint)
#:autoload (guix base64) (base64-encode)
#:use-module (guix build-system)
#:use-module (guix diagnostics)
+ #:use-module (guix discovery)
#:use-module (guix download)
#:use-module (guix ftp-client)
#:use-module (guix http-client)
@@ -1843,6 +1845,62 @@ (define (check-formatting package)
(G_ "source file not found"))))))))
'())))
+(define (file-module file)
+ "Return the resolved module defined in FILE."
+ (call-with-input-file file
+ (lambda (port)
+ (let loop ()
+ (match (read port)
+ (('define-module module . _) (resolve-module module))
+ ((? eof-object?) #f)
+ (_ (loop)))))))
+
+(define (module-dependencies module)
+ "Return an alist of (module . public-exports) for each of MODULE's imports."
+ (fold-module-public-variables*
+ (lambda (module sym _ alist)
+ (assoc-set! alist module (cons sym (or (assoc-ref alist module) '()))))
+ '()
+ (module-uses module)))
+
+(define (sexp-symbols sexp)
+ "Return all symols in SEXP."
+ (match sexp
+ ((? symbol?) (list sexp))
+ ((? list?) (apply append (map sexp-symbols sexp)))
+ (_ '())))
+
+(define (file-symbols file)
+ "Return all symbols in FILE."
+ (call-with-input-file file
+ (lambda (port)
+ (let loop ((res '()))
+ (let ((sexp (read port)))
+ (if (eof-object? sexp)
+ res
+ (loop (append res (sexp-symbols sexp)))))))))
+
+(define (report-unused-module package module)
+ "Report a warning that MODULE is not used in the file where PACKAGE is defined."
+ (make-warning package
+ (G_ "Imported module ~a is not used.")
+ (list (module-name module))))
+
+(define (check-unused-modules package)
+ "Check if the file in which PACKAGE is defined contains unused module imports."
+ (let* ((file (package-file package))
+ (symbols (file-symbols file))
+ (dependencies (module-dependencies (file-module file))))
+ (fold
+ (match-lambda*
+ (((module . publics) res)
+ (if (null? (lset-intersection eq? publics symbols))
+ (cons (report-unused-module package module)
+ res)
+ res)))
+ '()
+ dependencies)))
+
\f
;;;
;;; List of checkers.
@@ -1922,7 +1980,11 @@ (define %local-checkers
(lint-checker
(name 'formatting)
(description "Look for formatting issues in the source")
- (check check-formatting))))
+ (check check-formatting))
+ (lint-checker
+ (name 'unused-modules)
+ (description "Look for unused modules in the package file")
+ (check check-unused-modules))))
(define %network-dependent-checkers
(list
^ permalink raw reply related [flat|nested] 4+ messages in thread
* [bug#61266] [PATCH 1/1] lint: Add unused-modules linter.
2023-02-04 5:59 [bug#61266] [PATCH 1/1] lint: Add unused-modules linter Reily Siegel
@ 2023-02-11 23:55 ` Ludovic Courtès
2023-02-13 18:20 ` Reily Siegel
0 siblings, 1 reply; 4+ messages in thread
From: Ludovic Courtès @ 2023-02-11 23:55 UTC (permalink / raw)
To: Reily Siegel; +Cc: 61266
Hi Reily,
Reily Siegel <mail@reilysiegel.com> skribis:
> * guix/lint.scm (file-module): New function.
> (module-dependencies): New function.
> (sexp-symbols): New function.
> (file-symbols): New function.
> (report-unused-module): New function.
> (check-unused-modules): New function.
> (%local-checkers): Add check-unused-modules.
Nice! This is a hot topic, discussed at the Guix Days last week!
https://lists.gnu.org/archive/html/guix-devel/2023-02/msg00028.html
[...]
> +(define (check-unused-modules package)
> + "Check if the file in which PACKAGE is defined contains unused module imports."
> + (let* ((file (package-file package))
> + (symbols (file-symbols file))
> + (dependencies (module-dependencies (file-module file))))
> + (fold
> + (match-lambda*
> + (((module . publics) res)
> + (if (null? (lset-intersection eq? publics symbols))
> + (cons (report-unused-module package module)
> + res)
> + res)))
> + '()
> + dependencies)))
As you may know, this is an approximation: it doesn’t take into account
shadowed bindings, module import renamers and selections, and so on; it
might think a module is used just because a symbol with the same name as
one it exports appears somewhere in the code. In practice, it probably
works quite well for package modules though, right?
I have just submitted a patch adding a ‘-Wunused-module’ warning to
Guile’s compiler, which avoids these issues:
https://lists.gnu.org/archive/html/guile-devel/2023-02/msg00026.html
I wonder if we should stick to that and avoid having a lint warning
altogether. WDYT?
Thanks,
Ludo’.
^ permalink raw reply [flat|nested] 4+ messages in thread
* [bug#61266] [PATCH 1/1] lint: Add unused-modules linter.
2023-02-11 23:55 ` Ludovic Courtès
@ 2023-02-13 18:20 ` Reily Siegel
2023-02-20 10:53 ` bug#61266: " Ludovic Courtès
0 siblings, 1 reply; 4+ messages in thread
From: Reily Siegel @ 2023-02-13 18:20 UTC (permalink / raw)
To: Ludovic Courtès; +Cc: 61266
Ludovic Courtès <ludo@gnu.org> writes:
> I have just submitted a patch adding a ‘-Wunused-module’ warning to
> Guile’s compiler, which avoids these issues:
>
> https://lists.gnu.org/archive/html/guile-devel/2023-02/msg00026.html
>
> I wonder if we should stick to that and avoid having a lint warning
> altogether. WDYT?
This is probably a much more workable approach. Another problem with
lint checkers that I forgot to mention in my initial patch is that they
are really designed to work on packages, not files.
--
Reily Siegel
^ permalink raw reply [flat|nested] 4+ messages in thread
* bug#61266: [PATCH 1/1] lint: Add unused-modules linter.
2023-02-13 18:20 ` Reily Siegel
@ 2023-02-20 10:53 ` Ludovic Courtès
0 siblings, 0 replies; 4+ messages in thread
From: Ludovic Courtès @ 2023-02-20 10:53 UTC (permalink / raw)
To: Reily Siegel; +Cc: 61266-done
Hi Reily,
Reily Siegel <mail@reilysiegel.com> skribis:
> Ludovic Courtès <ludo@gnu.org> writes:
>
>> I have just submitted a patch adding a ‘-Wunused-module’ warning to
>> Guile’s compiler, which avoids these issues:
>>
>> https://lists.gnu.org/archive/html/guile-devel/2023-02/msg00026.html
>>
>> I wonder if we should stick to that and avoid having a lint warning
>> altogether. WDYT?
>
> This is probably a much more workable approach. Another problem with
> lint checkers that I forgot to mention in my initial patch is that they
> are really designed to work on packages, not files.
Alright, I’m closing this issue but let’s reopen it if we eventually
change our mind.
Thanks for looking into this!
Ludo’.
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2023-02-20 10:54 UTC | newest]
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2023-02-04 5:59 [bug#61266] [PATCH 1/1] lint: Add unused-modules linter Reily Siegel
2023-02-11 23:55 ` Ludovic Courtès
2023-02-13 18:20 ` Reily Siegel
2023-02-20 10:53 ` bug#61266: " Ludovic Courtès
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