From: Nikita Karetnikov <nikita@karetnikov.org>
To: "Ludovic Courtès" <ludo@gnu.org>
Cc: guix-devel@gnu.org
Subject: Re: New ‘--list-generations’ and ‘--delete-generations’ options
Date: Thu, 12 Sep 2013 13:17:52 +0400 [thread overview]
Message-ID: <87wqmmxutb.fsf@karetnikov.org> (raw)
In-Reply-To: <87li336ofs.fsf@gnu.org> ("Ludovic Courtès"'s message of "Wed, 11 Sep 2013 23:25:27 +0200")
[-- Attachment #1.1: Type: text/plain, Size: 1026 bytes --]
> By definition submatches 1 and 2 exist when RES is true.
> Thus, I’d remove ‘safe-match:substring->number’ and do:
> (match (string-match "^([0-9]+)\\.\\.([0-9]+)$" str)
> (#f #f)
> (matches
> (let ((start (number->string (match:substring matches 1)))
> (end (number->string (match:substring matches 2))))
> ...)))
Done.
> Probably this can reduce to a big ‘cond’, which would be even more
> readable:
> (cond ((maybe-integer)
> =>
> list)
> ((string-match "^([0-9]+)\\.\\.([0-9]+)$" str)
> =>
> (lambda (match)
> ...))
> ...)
Are you sure? I haven’t found a way to make ‘cond’ as readable as ‘or’.
I’m attaching a sketchy version. If you don’t see any problems, I’ll
try to integrate this code into ‘package.scm’.
(Something is wrong with the store on my machine, so I can’t properly
test the filtering part. But I’ll do it as soon as possible.)
[-- Attachment #1.2: avail-generations5.scm --]
[-- Type: text/plain, Size: 4232 bytes --]
(define-module (avail-generations)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-19)
#:use-module (srfi srfi-26)
#:use-module (ice-9 regex)
#:use-module (ice-9 match))
(define profile-numbers (@@ (guix scripts package) profile-numbers))
(define %current-profile (@@ (guix scripts package) %current-profile))
;;;
;;; Parsing.
;;;
(define (string->generations str)
(define (maybe-integer)
(let ((x (string->number str)))
(and (integer? x)
(list x))))
(define (maybe-comma-separated-integers)
(let ((lst (delete-duplicates
(map string->number
(delete "" (string-split str #\,))))))
(and (every integer? lst)
lst)))
(define (maybe-whole-range)
(match (string-match "^([0-9]+)\\.\\.([0-9]+)$" str)
(#f #f)
(res
(let ((s (string->number (match:substring res 1)))
(e (string->number (match:substring res 2))))
(and (every integer? (list s e))
(<= s e)
(iota (1+ (- e s)) s))))))
(define (maybe-start-range)
(match (string-match "^([0-9]+)\\.\\.$" str)
(#f #f)
(res
(let ((s (string->number (match:substring res 1))))
(and (integer? s)
`(>= ,s))))))
(define (maybe-end-range)
(match (string-match "^\\.\\.([0-9]+)$" str)
(#f #f)
(res
(let ((e (string->number (match:substring res 1))))
(and (integer? e)
`(<= ,e))))))
(or (maybe-integer) (maybe-comma-separated-integers)
(maybe-whole-range) (maybe-start-range) (maybe-end-range)))
(define (string->duration str)
(define (maybe-duration hours pattern)
(match (string-match pattern str)
(#f #f)
(res
(make-time time-duration 0
(* 3600 hours (string->number (match:substring res 1)))))))
(define (days)
(maybe-duration 24 "^([0-9]+)d$"))
(define (weeks)
(maybe-duration (* 24 7) "^([0-9]+)w$"))
(define (months)
(maybe-duration (* 24 30) "^([0-9]+)m$"))
(or (days) (weeks) (months)))
;;;
;;; Filtering.
;;;
(define* (available-generations str #:optional (profile %current-profile))
(define (valid-generations lst)
(define (valid-gen? n)
(any (cut = n <>) (profile-numbers profile)))
(fold-right (lambda (x lst)
(if (valid-gen? x)
(cons x lst)
lst))
'()
lst))
;; XXX: find a better name for this function.
(define (filter-generations gens)
(match gens
(() '())
(('>= n)
(drop-while (cut > n <>)
;; XXX: is it really necessary to sort? Check
;; 'profile-numbers'.
(sort (profile-numbers profile) <)))
(('<= n)
(valid-generations (iota n 1)))
((lst ..1)
(valid-generations lst))
(_ #f)))
;; XXX: find a better name.
(define (filter-by-duration dur)
(define dates-gens
;; Return an alist of dates and generations.
(map (lambda (x)
(cons (and=> (stat (format #f "~a-~a-link"
;; XXX: Should I check that
;; 'number->string's argument is
;; actually a number? Can I
;; trust 'profile-numbers'?
profile (number->string x)))
stat:ctime)
x))
;; XXX: Is there a need to sort?
(sort (profile-numbers profile) <)))
(define dates
(fold-right (lambda (x lst)
(cons (first x) lst))
'()
dates-gens))
(match dur
(#f #f)
(res
(let ((s (time-second (subtract-duration (current-time) dur))))
(map (cut assoc-ref dates-gens <>)
(filter (cut <= s <>) dates))))))
(cond ((string->generations str)
=>
filter-generations)
((string->duration str)
=>
filter-by-duration)
(else #f)))
;; XXX:
;; scheme@(avail-generations)> (available-generations "..0")
;; $21 = ()
[-- Attachment #2: Type: application/pgp-signature, Size: 835 bytes --]
next prev parent reply other threads:[~2013-09-12 9:13 UTC|newest]
Thread overview: 132+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-29 12:34 Goals for 0.4 Ludovic Courtès
2013-08-29 13:16 ` Nikita Karetnikov
2013-08-29 13:36 ` Ludovic Courtès
2013-08-30 17:55 ` Nikita Karetnikov
2013-08-30 18:31 ` Ludovic Courtès
2013-08-31 16:40 ` Nikita Karetnikov
2013-08-31 18:05 ` Ludovic Courtès
2013-08-31 20:34 ` Jose E. Marchesi
2013-08-31 21:07 ` Ludovic Courtès
2013-09-01 23:16 ` New ‘--list-generations’ and ‘--delete-generations’ options (was: Goals for 0.4) Nikita Karetnikov
2013-09-02 9:08 ` New ‘--list-generations’ and ‘--delete-generations’ options Ludovic Courtès
2013-09-05 1:30 ` Nikita Karetnikov
2013-09-05 20:00 ` Ludovic Courtès
2013-09-05 21:14 ` Nikita Karetnikov
2013-09-07 19:34 ` Ludovic Courtès
2013-09-08 10:59 ` Nikita Karetnikov
2013-09-08 20:22 ` Ludovic Courtès
2013-09-09 9:17 ` Nikita Karetnikov
2013-09-09 16:55 ` Ludovic Courtès
2013-09-11 5:16 ` Nikita Karetnikov
2013-09-11 21:25 ` Ludovic Courtès
2013-09-12 9:17 ` Nikita Karetnikov [this message]
2013-09-12 12:26 ` Ludovic Courtès
2013-09-13 14:44 ` Nikita Karetnikov
2013-09-13 21:29 ` Ludovic Courtès
2013-09-16 11:12 ` Nikita Karetnikov
2013-09-16 12:16 ` Ludovic Courtès
2013-09-18 0:43 ` PRELIMINARY: [PATCH] guix package: Add '--list-generations' Nikita Karetnikov
2013-09-18 17:35 ` Nikita Karetnikov
2013-09-18 21:32 ` Ludovic Courtès
2013-09-19 0:49 ` Nikita Karetnikov
2013-09-19 9:39 ` Ludovic Courtès
2013-09-19 11:48 ` Nikita Karetnikov
2013-09-19 12:13 ` Ludovic Courtès
2013-09-21 20:39 ` Ludovic Courtès
2013-09-18 21:35 ` PRELIMINARY: " Ludovic Courtès
2013-09-22 19:19 ` [PATCH] guix package: Add '--delete-generations' Nikita Karetnikov
2013-09-22 20:15 ` Generation 0 (was: [PATCH] guix package: Add '--delete-generations'.) Nikita Karetnikov
2013-09-22 21:15 ` Generation 0 Ludovic Courtès
2013-09-23 10:14 ` Nikita Karetnikov
2013-09-23 15:42 ` Ludovic Courtès
2013-09-24 0:54 ` Nikita Karetnikov
2013-09-24 5:56 ` [PATCH] guix package: Show which generation is the current one. (was: Generation 0) Nikita Karetnikov
2013-09-24 12:45 ` [PATCH] guix package: Show which generation is the current one Ludovic Courtès
2013-09-24 13:55 ` Nikita Karetnikov
2013-09-24 14:16 ` Ludovic Courtès
2013-09-25 2:10 ` Nikita Karetnikov
2013-09-25 12:51 ` Ludovic Courtès
2013-09-24 12:43 ` Generation 0 Ludovic Courtès
2013-09-24 22:29 ` Nikita Karetnikov
2013-09-25 12:50 ` Ludovic Courtès
2013-09-25 18:07 ` Nikita Karetnikov
2013-09-25 19:24 ` Ludovic Courtès
2013-09-26 2:18 ` Nikita Karetnikov
2013-09-26 9:44 ` Ludovic Courtès
2013-09-22 20:55 ` [PATCH] guix package: Add '--delete-generations' Ludovic Courtès
2013-09-23 10:11 ` Nikita Karetnikov
2013-09-23 15:41 ` Ludovic Courtès
2013-09-24 7:21 ` Nikita Karetnikov
2013-09-24 12:50 ` Ludovic Courtès
2013-09-24 13:57 ` Nikita Karetnikov
2013-09-25 4:21 ` Nikita Karetnikov
2013-09-25 13:05 ` Ludovic Courtès
2013-09-26 2:47 ` Nikita Karetnikov
2013-09-26 9:49 ` Ludovic Courtès
2013-09-27 19:04 ` Ludovic Courtès
2013-09-03 19:21 ` MIPS64/N64 support (was: Goals for 0.4) Nikita Karetnikov
2013-09-03 20:45 ` MIPS64/N64 support Ludovic Courtès
2013-09-04 0:35 ` Nikita Karetnikov
2013-09-04 12:18 ` Ludovic Courtès
2013-09-06 8:35 ` Nikita Karetnikov
2013-09-06 9:46 ` Ludovic Courtès
2013-09-07 2:45 ` Nikita Karetnikov
2013-09-07 12:57 ` Ludovic Courtès
2013-09-08 14:21 ` Nikita Karetnikov
2013-09-08 19:54 ` Ludovic Courtès
2013-09-09 5:38 ` Nikita Karetnikov
2013-09-09 16:47 ` Ludovic Courtès
2013-09-27 2:16 ` Nikita Karetnikov
2013-09-27 19:00 ` Ludovic Courtès
2013-09-29 13:27 ` Nikita Karetnikov
2013-09-29 13:31 ` Ludovic Courtès
2013-09-29 23:18 ` Nikita Karetnikov
2013-09-30 11:32 ` Nikita Karetnikov
2013-09-30 16:26 ` Ludovic Courtès
2013-09-30 21:51 ` Nikita Karetnikov
2013-10-01 7:09 ` Lluís Batlle i Rossell
2013-10-01 7:48 ` Nikita Karetnikov
2013-10-01 8:03 ` Lluís Batlle i Rossell
2013-10-01 8:55 ` Nikita Karetnikov
2013-10-01 8:59 ` Nikita Karetnikov
2013-10-01 9:30 ` Lluís Batlle i Rossell
2013-10-01 10:06 ` Nikita Karetnikov
2013-10-01 10:04 ` Lluís Batlle i Rossell
2013-10-01 11:25 ` Ludovic Courtès
2013-10-01 11:56 ` Lluís Batlle i Rossell
2013-10-07 18:47 ` Mark H Weaver
2013-10-07 19:39 ` Ludovic Courtès
2013-10-08 23:03 ` Mark H Weaver
2013-10-09 6:53 ` Mark H Weaver
2013-10-09 10:42 ` Ludovic Courtès
2013-10-09 10:39 ` Ludovic Courtès
2013-10-10 4:08 ` Mark H Weaver
2013-09-30 16:09 ` Ludovic Courtès
2013-08-29 15:49 ` Goals for 0.4 Amirouche Boubekki
2013-08-29 20:04 ` Ludovic Courtès
2013-08-30 16:09 ` Cyprien Nicolas
2013-08-30 17:40 ` Amirouche Boubekki
2013-08-30 19:31 ` Overlays Ludovic Courtès
2013-08-30 20:42 ` Overlays Nikita Karetnikov
2013-08-30 21:21 ` Overlays Ludovic Courtès
2013-08-31 10:56 ` Overlays Amirouche Boubekki
2013-08-31 15:57 ` Overlays Ludovic Courtès
2013-08-29 20:42 ` Goals for 0.4 Andreas Enge
2013-08-29 21:32 ` Ludovic Courtès
2013-09-25 8:43 ` Andreas Enge
2013-09-25 13:13 ` Ludovic Courtès
2013-09-26 11:35 ` Andreas Enge
2013-09-28 13:25 ` Ludovic Courtès
2013-09-29 21:29 ` Alex Sassmannshausen
2013-09-02 17:33 ` Cyril Roelandt
2013-09-02 19:38 ` Ludovic Courtès
2013-09-02 19:40 ` Cyril Roelandt
2013-09-02 21:35 ` Ludovic Courtès
2013-09-06 9:19 ` ‘--no-substitutes’ is ignored on i686 (was: Goals for 0.4) Nikita Karetnikov
2013-09-06 9:59 ` ‘--no-substitutes’ is ignored on i686 Ludovic Courtès
2013-09-07 8:43 ` Nikita Karetnikov
2013-09-07 13:00 ` Ludovic Courtès
2013-09-08 11:53 ` Nikita Karetnikov
2013-09-08 11:51 ` Cyril Roelandt
2013-09-08 13:22 ` Nikita Karetnikov
2013-09-24 21:59 ` Goals for 0.4 Ludovic Courtès
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