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marionette: Allow passing custom OCR arguments. 

* gnu/build/marionette.scm (%default-ocrad-arguments): New variable.
(invoke-ocrad-ocr, invoke-tesseract-ocr, marionette-screen-text)
[ocr-arguments]: New argument.

Signed-off-by: Maxim Cournoyer <maxim.cournoyer@gmail.com>
This commit is contained in:
Bruno Victal 2023-06-30 14:58:12 +01:00 committed by Maxim Cournoyer
parent b9bd1bcce9
commit 6a86e2d13a
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GPG Key ID: 1260E46482E63562
1 changed files with 31 additions and 10 deletions
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41
gnu/build/marionette.scm
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@ -1,7 +1,8 @@
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2016-2022 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2018 Chris Marusich <cmmarusich@gmail.com>
;;; Copyright © 2022 Maxim Cournoyer <maxim.cournoyer@gmail.com>
;;; Copyright © 2022, 2023 Maxim Cournoyer <maxim.cournoyer@gmail.com>
;;; Copyright © 2023 Bruno Victal <mirai@makinata.eu>
;;;
;;; This file is part of GNU Guix.
;;;
@ -36,6 +37,7 @@
wait-for-unix-socket
marionette-control
wait-for-screen-text
%default-ocrad-arguments
%qwerty-us-keystrokes
marionette-type
@ -287,23 +289,30 @@ Monitor\")."
;; The "quit" command terminates QEMU immediately, with no output.
(unless (string=? command "quit") (wait-for-monitor-prompt monitor)))))
(define* (invoke-ocrad-ocr image #:key (ocrad "ocrad"))
(define %default-ocrad-arguments
'("--invert" "--scale=10"))
(define* (invoke-ocrad-ocr image #:key (ocrad "ocrad")
(ocr-arguments %default-ocrad-arguments))
"Invoke the OCRAD command on image, and return the recognized text."
(let* ((pipe (open-pipe* OPEN_READ ocrad "-i" "-s" "10" image))
(let* ((command (string-join `(,ocrad ,@ocr-arguments ,image)))
(pipe (open-input-pipe command))
(text (get-string-all pipe)))
(unless (zero? (close-pipe pipe))
(error "'ocrad' failed" ocrad))
text))
(define* (invoke-tesseract-ocr image #:key (tesseract "tesseract"))
(define* (invoke-tesseract-ocr image #:key (tesseract "tesseract")
(ocr-arguments '()))
"Invoke the TESSERACT command on IMAGE, and return the recognized text."
(let* ((output-basename (tmpnam))
(output-basename* (string-append output-basename ".txt")))
(output-basename* (string-append output-basename ".txt"))
(arguments (cons* image output-basename ocr-arguments)))
(dynamic-wind
(const #t)
(lambda ()
(let ((exit-val (status:exit-val
(system* tesseract image output-basename))))
(apply system* tesseract arguments))))
(unless (zero? exit-val)
(error "'tesseract' failed" tesseract))
(call-with-input-file output-basename* get-string-all)))
@ -311,7 +320,8 @@ Monitor\")."
(false-if-exception (delete-file output-basename))
(false-if-exception (delete-file output-basename*))))))
(define* (marionette-screen-text marionette #:key (ocr "ocrad"))
(define* (marionette-screen-text marionette #:key (ocr "ocrad")
ocr-arguments)
"Take a screenshot of MARIONETTE, perform optical character
recognition (OCR), and return the text read from the screen as a string, along
the screen dump image used. Do this by invoking OCR, which should be the file
@ -324,14 +334,22 @@ if it is not needed."
;; Process it via the OCR.
(cond
((string-contains ocr "ocrad")
(values (invoke-ocrad-ocr image #:ocrad ocr) image))
(values (invoke-ocrad-ocr image
#:ocrad ocr
#:ocr-arguments
(or ocr-arguments %default-ocrad-arguments))
image))
((string-contains ocr "tesseract")
(values (invoke-tesseract-ocr image #:tesseract ocr) image))
(values (invoke-tesseract-ocr image
#:tesseract ocr
#:ocr-arguments (or ocr-arguments '()))
image))
(else (error "unsupported ocr command"))))
(define* (wait-for-screen-text marionette predicate
#:key
(ocr "ocrad")
ocr-arguments
(timeout 30)
pre-action
post-action)
@ -359,7 +377,10 @@ Likewise for POST-ACTION, except it runs at the end of a successful OCR."
'ocr-text: last-text
'screendump: screendump-backup))
(let* ((_ (and (procedure? pre-action) (pre-action)))
(text screendump (marionette-screen-text marionette #:ocr ocr))
(text screendump
(marionette-screen-text marionette
#:ocr ocr
#:ocr-arguments ocr-arguments))
(_ (and (procedure? post-action) (post-action)))
(result (predicate text)))
(cond (result