GNU bug report logs -
#35935
[PATCH] guix: import: simplify recursive import
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Reported by: Robert Vollmert <rob <at> vllmrt.net>
Date: Mon, 27 May 2019 20:08:01 UTC
Severity: normal
Tags: patch
Done: Oleg Pykhalov <go.wigust <at> gmail.com>
Bug is archived. No further changes may be made.
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Your bug report
#35935: [PATCH] guix: import: simplify recursive import
which was filed against the guix-patches package, has been closed.
The explanation is attached below, along with your original report.
If you require more details, please reply to 35935 <at> debbugs.gnu.org.
--
35935: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=35935
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems
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Robert Vollmert <rob <at> vllmrt.net> writes:
[…]
>> I also added a copyright line if you don't mind:
>>
>> ;;; Copyright © 2019 Robert Vollmert <rob <at> vllmrt.net>
>>
>> Is it OK, Robert? I tested manually with ‘gem’ and ‘elpa’ recursive
>> importers and ready to push :-)
>
> Yes, of course. (Should I generally be adding copyright lines when edit
> a file?
Yes.
Pushed as 5b315f3ea93020df52bc11105064a1398687e572 to master.
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This simplifies the logic of recursive-import, intending no
major functional changes. The package import function is no
longer called twice per package. Failed imports now make it
to the package stream as '() instead of #f.
* guix/import/utils.scm: Simplify recursive-import.
---
guix/import/utils.scm | 86 ++++++++++++++++---------------------------
1 file changed, 32 insertions(+), 54 deletions(-)
diff --git a/guix/import/utils.scm b/guix/import/utils.scm
index 516c0cfaa2..ff548b809a 100644
--- a/guix/import/utils.scm
+++ b/guix/import/utils.scm
@@ -378,57 +378,35 @@ separated by PRED."
#:allow-other-keys)
"Generate a stream of package expressions for PACKAGE-NAME and all its
dependencies."
- (receive (package . dependencies)
- (repo->guix-package package-name repo)
- (if (not package)
- stream-null
-
- ;; Generate a lazy stream of package expressions for all unknown
- ;; dependencies in the graph.
- (let* ((make-state (lambda (queue done)
- (cons queue done)))
- (next (match-lambda
- (((next . rest) . done) next)))
- (imported (match-lambda
- ((queue . done) done)))
- (done? (match-lambda
- ((queue . done)
- (zero? (length queue)))))
- (unknown? (lambda* (dependency #:optional (done '()))
- (and (not (member dependency
- done))
- (null? (find-packages-by-name
- (guix-name dependency))))))
- (update (lambda (state new-queue)
- (match state
- (((head . tail) . done)
- (make-state (lset-difference
- equal?
- (lset-union equal? new-queue tail)
- done)
- (cons head done)))))))
- (stream-cons
- package
- (stream-unfold
- ;; map: produce a stream element
- (lambda (state)
- (repo->guix-package (next state) repo))
-
- ;; predicate
- (negate done?)
-
- ;; generator: update the queue
- (lambda (state)
- (receive (package . dependencies)
- (repo->guix-package (next state) repo)
- (if package
- (update state (filter (cut unknown? <>
- (cons (next state)
- (imported state)))
- (car dependencies)))
- ;; TODO: Try the other archives before giving up
- (update state (imported state)))))
-
- ;; initial state
- (make-state (filter unknown? (car dependencies))
- (list package-name))))))))
+ (define (exists? dependency)
+ (not (null? (find-packages-by-name (guix-name dependency)))))
+ (define initial-state (list #f (list package-name) (list)))
+ (define (step state)
+ (match state
+ ((prev (next . rest) done)
+ (define (handle? dep)
+ (and
+ (not (equal? dep next))
+ (not (member dep done))
+ (not (exists? dep))))
+ (receive (package . dependencies) (repo->guix-package next repo)
+ (list
+ (if package package '()) ;; default #f on failure would interrupt
+ (if package
+ (lset-union equal? rest (filter handle? (car dependencies)))
+ rest)
+ (cons next done))))
+ ((prev '() done)
+ (list #f '() done))))
+
+ ;; Generate a lazy stream of package expressions for all unknown
+ ;; dependencies in the graph.
+ (stream-unfold
+ ;; map: produce a stream element
+ (match-lambda ((latest queue done) latest))
+ ;; predicate
+ (match-lambda ((latest queue done) latest))
+ ;; generator: update the queue
+ step
+ ;; initial state
+ (step initial-state)))
--
2.20.1 (Apple Git-117)
This bug report was last modified 5 years and 349 days ago.
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