diff options
| author | Ludovic Courtès <ludo@gnu.org> | 2019-01-20 18:45:40 +0100 |
|---|---|---|
| committer | Ludovic Courtès <ludo@gnu.org> | 2019-01-20 18:45:40 +0100 |
| commit | f58f676b12254cdf5adb453798917b06ac6609a6 (patch) | |
| tree | 9c44ed893b75568c0636c5818eccc4888805fd6f /guix | |
| parent | ab6025b52cec792312d465107e9b86d7900c5f93 (diff) | |
channels: Use 'fold2'.
* guix/channels.scm (latest-channel-instances): Use 'fold2' instead of
'fold'.
Diffstat (limited to 'guix')
| -rw-r--r-- | guix/channels.scm | 72 |
1 files changed, 36 insertions, 36 deletions
diff --git a/guix/channels.scm b/guix/channels.scm index e588d86b4b..10345c1ce5 100644 --- a/guix/channels.scm +++ b/guix/channels.scm @@ -26,6 +26,7 @@ #:use-module (guix monads) #:use-module (guix profiles) #:use-module (guix derivations) + #:use-module (guix combinators) #:use-module (guix store) #:use-module (guix i18n) #:use-module ((guix utils) @@ -162,44 +163,43 @@ of previously processed channels." (or (channel-commit b) (not (or (channel-commit a) (channel-commit b)))))))) + ;; Accumulate a list of instances. A list of processed channels is also ;; accumulated to decide on duplicate channel specifications. - (match (fold (lambda (channel acc) - (match acc - ((#:channels previous-channels #:instances instances) - (if (ignore? channel previous-channels) - acc - (begin - (format (current-error-port) - (G_ "Updating channel '~a' from Git repository at '~a'...~%") - (channel-name channel) - (channel-url channel)) - (let-values (((checkout commit) - (latest-repository-commit store (channel-url channel) - #:ref (channel-reference - channel)))) - (let ((instance (channel-instance channel commit checkout))) - (let-values (((new-instances new-channels) - (latest-channel-instances - store - (channel-instance-dependencies instance) - previous-channels))) - `(#:channels - ,(append (cons channel new-channels) - previous-channels) - #:instances - ,(append (cons instance new-instances) - instances)))))))))) - `(#:channels ,previous-channels #:instances ()) - channels) - ((#:channels channels #:instances instances) - (let ((instance-name (compose channel-name channel-instance-channel))) - ;; Remove all earlier channel specifications if they are followed by a - ;; more specific one. - (values (delete-duplicates instances - (lambda (a b) - (eq? (instance-name a) (instance-name b)))) - channels))))) + (define-values (resulting-channels instances) + (fold2 (lambda (channel previous-channels instances) + (if (ignore? channel previous-channels) + (values previous-channels instances) + (begin + (format (current-error-port) + (G_ "Updating channel '~a' from Git repository at '~a'...~%") + (channel-name channel) + (channel-url channel)) + (let-values (((checkout commit) + (latest-repository-commit store (channel-url channel) + #:ref (channel-reference + channel)))) + (let ((instance (channel-instance channel commit checkout))) + (let-values (((new-instances new-channels) + (latest-channel-instances + store + (channel-instance-dependencies instance) + previous-channels))) + (values (append (cons channel new-channels) + previous-channels) + (append (cons instance new-instances) + instances)))))))) + previous-channels + '() ;instances + channels)) + + (let ((instance-name (compose channel-name channel-instance-channel))) + ;; Remove all earlier channel specifications if they are followed by a + ;; more specific one. + (values (delete-duplicates instances + (lambda (a b) + (eq? (instance-name a) (instance-name b)))) + resulting-channels))) (define* (checkout->channel-instance checkout #:key commit |