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pull: Truncate the list of packages displayed on completion.

Browse source 
Previously, if you'd run 'guix pull' after a couple of weeks, it would
fill your screen with package names, which is unhelpful.

* guix/scripts/pull.scm (ellipsis): New procedure.
(display-new/upgraded-packages): Add #:concise?.
[list->enumeration]: New procedure.
Use it instead of 'string-join'.
(display-profile-news): Pass #:concise? #t.
This commit is contained in:
Ludovic Courtès 2019-03-28 16:17:11 +01:00
parent 9f4169f6c8
commit 539af7f257
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1 changed files with 22 additions and 5 deletions
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27
guix/scripts/pull.scm
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@ -181,6 +181,7 @@ (define (display-profile-news profile)
(new (profile-package-alist
(generation-file-name profile current))))
(display-new/upgraded-packages old new
#:concise? #t
#:heading (G_ "New in this revision:\n"))))
(_ #t)))
@ -377,16 +378,33 @@ (define (new/upgraded-packages alist1 alist2)
alist2)))
(values new upgraded)))
(define* (ellipsis #:optional (port (current-output-port)))
"Return HORIZONTAL ELLIPSIS three dots if PORT's encoding cannot represent
it."
(match (port-encoding port)
("UTF-8" "…")
(_ "...")))
(define* (display-new/upgraded-packages alist1 alist2
#:key (heading ""))
#:key (heading "") concise?)
"Given the two package name/version alists ALIST1 and ALIST2, display the
list of new and upgraded packages going from ALIST1 to ALIST2. When ALIST1
and ALIST2 differ, display HEADING upfront."
and ALIST2 differ, display HEADING upfront. When CONCISE? is true, do not
display long package lists that would fill the user's screen."
(define (pretty str column)
(indented-string (fill-paragraph str (- (%text-width) 4)
column)
4))
(define list->enumeration
(if concise?
(lambda* (lst #:optional (max 12))
(if (> (length lst) max)
(string-append (string-join (take lst max) ", ")
", " (ellipsis))
(string-join lst ", ")))
(cut string-join <> ", ")))
(let-values (((new upgraded) (new/upgraded-packages alist1 alist2)))
(unless (and (null? new) (null? upgraded))
(display heading))
@ -397,8 +415,7 @@ (define (pretty str column)
(format #t (N_ " ~h new package: ~a~%"
" ~h new packages: ~a~%" count)
count
(pretty (string-join (sort (map first new) string<?)
", ")
(pretty (list->enumeration (sort (map first new) string<?))
30))))
(match (length upgraded)
(0 #t)
@ -406,7 +423,7 @@ (define (pretty str column)
(format #t (N_ " ~h package upgraded: ~a~%"
" ~h packages upgraded: ~a~%" count)
count
(pretty (string-join (sort upgraded string<?) ", ")
(pretty (list->enumeration (sort upgraded string<?))
35))))))
(define (display-profile-content-diff profile gen1 gen2)