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| -rw-r--r-- | guix/progress.scm | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/guix/progress.scm b/guix/progress.scm index ba7944214b..1ee7ec319f 100644 --- a/guix/progress.scm +++ b/guix/progress.scm @@ -1,6 +1,7 @@ ;;; GNU Guix --- Functional package management for GNU ;;; Copyright © 2017 Sou Bunnbu <iyzsong@gmail.com> ;;; Copyright © 2015 Steve Sprang <scs@stevesprang.com> +;;; Copyright © 2017 Ludovic Courtès <ludo@gnu.org> ;;; ;;; This file is part of GNU Guix. ;;; @@ -32,6 +33,7 @@ progress-reporter/silent progress-reporter/file + progress-reporter/bar byte-count->string current-terminal-columns @@ -212,6 +214,39 @@ ABBREVIATION used to shorten FILE for display." ;; Don't miss the last report. (stop render)))) +(define* (progress-reporter/bar total + #:optional + (prefix "") + (port (current-error-port))) + "Return a reporter that shows a progress bar every time one of the TOTAL +tasks is performed. Write PREFIX at the beginning of the line." + (define done 0) + + (define (report-progress) + (set! done (+ 1 done)) + (unless (> done total) + (let* ((ratio (* 100. (/ done total)))) + (erase-in-line port) + (if (string-null? prefix) + (display (progress-bar ratio (current-terminal-columns)) port) + (let ((width (- (current-terminal-columns) + (string-length prefix) 3))) + (display prefix port) + (display " " port) + (display (progress-bar ratio width) port))) + (force-output port)))) + + (progress-reporter + (start (lambda () + (set! done 0))) + (report report-progress) + (stop (lambda () + (erase-in-line port) + (unless (string-null? prefix) + (display prefix port) + (newline port)) + (force-output port))))) + ;; TODO: replace '(@ (guix build utils) dump-port))'. (define* (dump-port* in out #:key (buffer-size 16384) |