GNU bug report logs - #29509
[PATCH 0/6] Display progress bar in 'guix system init'

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From: Ludovic Courtès <ludo <at> gnu.org>
To: 29509 <at> debbugs.gnu.org
Cc: Ludovic Courtès <ludo <at> gnu.org>
Subject: [bug#29509] [PATCH 1/6] progress: Factorize erase-in-line.
Date: Thu, 30 Nov 2017 14:56:57 +0100

* guix/progress.scm (erase-in-line): New procedure.
(progress-reporter/file): Use it.
---
 guix/progress.scm | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/guix/progress.scm b/guix/progress.scm
index beca2c22a..1993c7403 100644
--- a/guix/progress.scm
+++ b/guix/progress.scm
@@ -153,6 +153,11 @@ width of the bar is BAR-WIDTH."
             (make-string filled #\#)
             (make-string empty #\space))))
 
+(define (erase-in-line port)
+  "Write an ANSI erase-in-line sequence to PORT to erase the whole line and
+move the cursor to the beginning of the line."
+  (display "\r\x1b[K" port))
+
 (define* (progress-reporter/file file size
                                  #:optional (log-port (current-output-port))
                                  #:key (abbreviation basename))
@@ -176,7 +181,7 @@ ABBREVIATION used to shorten FILE for display."
                                      (byte-count->string throughput)
                                      (seconds->string elapsed)
                                      (progress-bar %) %)))
-            (display "\r\x1b[K" log-port)
+            (erase-in-line log-port)
             (display (string-pad-middle left right
                                         (current-terminal-columns))
                      log-port)
@@ -188,7 +193,7 @@ ABBREVIATION used to shorten FILE for display."
                                      (byte-count->string throughput)
                                      (seconds->string elapsed)
                                      (byte-count->string transferred))))
-            (display "\r\x1b[K" log-port)
+            (erase-in-line log-port)
             (display (string-pad-middle left right
                                         (current-terminal-columns))
                      log-port)
-- 
2.15.0

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