@@ -213,6 +213,62 @@ newest generation of PROFILE."
(G_ "New in this revision:\n")))))
(_ #t)))
+(define (display-channel channel)
+ "Display information about CHANNEL."
+ (format (current-error-port)
+ ;; TRANSLATORS: This describes a "channel"; the first placeholder is
+ ;; the channel name (e.g., "guix") and the second placeholder is its
+ ;; URL.
+ (G_ " ~a at ~a~%")
+ (channel-name channel)
+ (channel-url channel)))
+
+(define (channel=? channel1 channel2)
+ "Return true if CHANNEL1 and CHANNEL2 are the same for all practical
+purposes."
+ ;; Assume that the URL matters less than the name.
+ (eq? (channel-name channel1) (channel-name channel2)))
+
+(define (display-channel-news profile)
+ "Display new about the channels of PROFILE "
+ (define previous
+ (and=> (relative-generation profile -1)
+ (cut generation-file-name profile <>)))
+
+ (when previous
+ (let ((old-channels (profile-channels previous))
+ (new-channels (profile-channels profile)))
+ (and (pair? old-channels) (pair? new-channels)
+ (begin
+ (match (lset-difference channel=? new-channels old-channels)
+ (()
+ #t)
+ (new
+ (let ((count (length new)))
+ (format (current-error-port)
+ (N_ " ~*One new channel:~%"
+ " ~a new channels:~%" count)
+ count)
+ (for-each display-channel new))))
+ (match (lset-difference channel=? old-channels new-channels)
+ (()
+ #t)
+ (removed
+ (let ((count (length removed)))
+ (format (current-error-port)
+ (N_ " ~*One channel removed:~%"
+ " ~a channels removed:~%" count)
+ count)
+ (for-each display-channel removed)))))))))
+
+(define (display-news profile)
+ ;; Display profile news, with the understanding that this process represents
+ ;; the newest generation.
+ (display-profile-news profile
+ #:current-is-newer? #t)
+
+ (display-channel-news profile))
+
(define* (build-and-install instances profile
#:key use-substitutes? verbose? dry-run?)
"Build the tool from SOURCE, and install it in PROFILE. When DRY-RUN? is
@@ -521,10 +577,7 @@ list of package changes.")))))
((numbers ...)
(list-generations profile numbers)))))))
(('display-news)
- ;; Display profile news, with the understanding that this process
- ;; represents the newest generation.
- (display-profile-news profile
- #:current-is-newer? #t))))
+ (display-news profile))))
(define (process-generation-change opts profile)
"Process a request to change the current generation (roll-back, switch, delete)."