Subject: [PATCH 12/14] marionette: Improve the error message of 'wait-for-screen-text'.

From: Maxim Cournoyer <[email-masked]>
Date: Sat, 13 Aug 2022 02:54:31 -0400

* gnu/build/marionette.scm (wait-for-screen-text): Return the last OCR'd text
when the predicate fails to match instead of the not useful predicate object.
---
 gnu/build/marionette.scm | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/gnu/build/marionette.scm b/gnu/build/marionette.scm
index 4f409166db..24170bbd30 100644
--- a/gnu/build/marionette.scm
+++ b/gnu/build/marionette.scm
@@ -1,6 +1,7 @@
 ;;; GNU Guix --- Functional package management for GNU
 ;;; Copyright © 2016-2022 Ludovic Courtès <[email-masked]>
 ;;; Copyright © 2018 Chris Marusich <[email-masked]>
+;;; Copyright © 2022 Maxim Cournoyer <[email-masked]>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -308,13 +309,14 @@ (define start
   (define end
     (+ start timeout))
 
-  (let loop ()
+  (let loop ((last-text #f))
     (if (> (car (gettimeofday)) end)
-        (error "'wait-for-screen-text' timeout" predicate)
-        (or (predicate (marionette-screen-text marionette #:ocrad ocrad))
-            (begin
-              (sleep 1)
-              (loop))))))
+        (error "'wait-for-screen-text' timeout" 'ocr-text: last-text)
+        (let ((text (marionette-screen-text marionette #:ocrad ocrad)))
+          (or (predicate text)
+              (begin
+                (sleep 1)
+                (loop text)))))))
 
 (define %qwerty-us-keystrokes
   ;; Maps "special" characters to their keystrokes.
-- 
2.36.1