build: Improve information density and appearance of download progress output.
* guix/build/download.scm (seconds->string): New function. (byte-count->string): New function. (progress-bar): New function. (throughput->string): Remove function. (progress-proc): Display base file name, elapsed time, and progress bar. Signed-off-by: Ludovic Courtès <ludo@gnu.org>master
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;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2012, 2013, 2014, 2015 Ludovic Courtès <ludo@gnu.org>
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;;; Copyright © 2015 Mark H Weaver <mhw@netris.org>
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;;; Copyright © 2015 Steve Sprang <scs@stevesprang.com>
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;;;
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;;; This file is part of GNU Guix.
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;;;
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@ -54,17 +55,46 @@ object, as an inexact number."
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(+ (time-second duration)
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(/ (time-nanosecond duration) 1e9)))
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(define (throughput->string throughput)
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"Given THROUGHPUT, measured in bytes per second, return a string
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representing it in a human-readable way."
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(if (> throughput 3e6)
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(format #f "~,2f MiB/s" (/ throughput (expt 2. 20)))
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(format #f "~,0f KiB/s" (/ throughput 1024.0))))
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(define (seconds->string duration)
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"Given DURATION in seconds, return a string representing it in 'hh:mm:ss'
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format."
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(if (not (number? duration))
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"00:00:00"
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(let* ((total-seconds (inexact->exact (round duration)))
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(extra-seconds (modulo total-seconds 3600))
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(hours (quotient total-seconds 3600))
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(mins (quotient extra-seconds 60))
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(secs (modulo extra-seconds 60)))
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(format #f "~2,'0d:~2,'0d:~2,'0d" hours mins secs))))
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(define (byte-count->string size)
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"Given SIZE in bytes, return a string representing it in a human-readable
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way."
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(let ((KiB 1024.)
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(MiB (expt 1024. 2))
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(GiB (expt 1024. 3))
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(TiB (expt 1024. 4)))
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(cond
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((< size KiB) (format #f "~dB" (inexact->exact size)))
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((< size MiB) (format #f "~dKiB" (inexact->exact (round (/ size KiB)))))
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((< size GiB) (format #f "~,1fMiB" (/ size MiB)))
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((< size TiB) (format #f "~,2fGiB" (/ size GiB)))
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(else (format #f "~,3fTiB" (/ size TiB))))))
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(define* (progress-bar % #:optional (bar-width 20))
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"Return % as a string representing an ASCII-art progress bar. The total
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width of the bar is BAR-WIDTH."
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(let* ((fraction (/ % 100))
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(filled (inexact->exact (floor (* fraction bar-width))))
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(empty (- bar-width filled)))
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(format #f "[~a~a]"
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(make-string filled #\#)
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(make-string empty #\space))))
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(define* (progress-proc file size #:optional (log-port (current-output-port)))
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"Return a procedure to show the progress of FILE's download, which is
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SIZE byte long. The returned procedure is suitable for use as an
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argument to `dump-port'. The progress report is written to LOG-PORT."
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"Return a procedure to show the progress of FILE's download, which is SIZE
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bytes long. The returned procedure is suitable for use as an argument to
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`dump-port'. The progress report is written to LOG-PORT."
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;; XXX: Because of <http://bugs.gnu.org/19939> this procedure is often not
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;; called as frequently as we'd like too; this is especially bad with Nginx
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;; on hydra.gnu.org, which returns whole nars as a single chunk.
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@ -83,14 +113,24 @@ argument to `dump-port'. The progress report is written to LOG-PORT."
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(if (number? size)
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(lambda (transferred cont)
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(with-elapsed-time elapsed
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(let ((% (* 100.0 (/ transferred size)))
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(throughput (if elapsed
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(/ transferred elapsed)
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0)))
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(let* ((% (* 100.0 (/ transferred size)))
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(throughput (if elapsed
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(/ transferred elapsed)
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0))
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(left (format #f " ~a ~a"
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(basename file)
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(byte-count->string size)))
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(right (format #f "~a/s ~a ~a~6,1f%"
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(byte-count->string throughput)
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(seconds->string elapsed)
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(progress-bar %) %))
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;; TODO: Make this adapt to the actual terminal width.
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(cols 80)
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(num-spaces (max 1 (- cols (+ (string-length left)
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(string-length right)))))
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(gap (make-string num-spaces #\space)))
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(format log-port "~a~a~a" left gap right)
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(display #\cr log-port)
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(format log-port "~a\t~5,1f% of ~,1f KiB (~a)"
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file % (/ size 1024.0)
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(throughput->string throughput))
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(flush-output-port log-port)
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(cont))))
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(lambda (transferred cont)
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@ -99,9 +139,10 @@ argument to `dump-port'. The progress report is written to LOG-PORT."
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(/ transferred elapsed)
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0)))
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(display #\cr log-port)
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(format log-port "~a\t~6,1f KiB transferred (~a)"
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file (/ transferred 1024.0)
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(throughput->string throughput))
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(format log-port "~a\t~a transferred (~a/s)"
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file
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(byte-count->string transferred)
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(byte-count->string throughput))
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(flush-output-port log-port)
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(cont))))))))
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