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-rw-r--r--guix/progress.scm35
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)