diff options
| -rw-r--r-- | gnu/packages/ocr.scm | 33 |
1 files changed, 30 insertions, 3 deletions
diff --git a/gnu/packages/ocr.scm b/gnu/packages/ocr.scm index e2c9f561cc..21d257ef24 100644 --- a/gnu/packages/ocr.scm +++ b/gnu/packages/ocr.scm @@ -132,6 +132,15 @@ models for the Tesseract OCR Engine.") (substitute* "configure.ac" (("AC_SUBST\\(\\[XML_CATALOG_FILES])") "")))) + (add-after 'unpack 'adjust-TESSDATA_PREFIX-macro + (lambda _ + ;; Use a deeper TESSDATA_PREFIX hierarchy so that a more + ;; specific search-path than '/share' can be specified. The + ;; build system uses CPPFLAGS for itself, so we can't simply set + ;; a make flag. + (substitute* "Makefile.am" + (("-DTESSDATA_PREFIX='\"@datadir@\"'") + "-DTESSDATA_PREFIX='\"@datadir@/tesseract-ocr\"'")))) (add-after 'build 'build-training (lambda* (#:key parallel-build? #:allow-other-keys) (define n (if parallel-build? (number->string @@ -140,7 +149,18 @@ models for the Tesseract OCR Engine.") (invoke "make" "-j" n "training"))) (add-after 'install 'install-training (lambda _ - (invoke "make" "training-install")))))) + (invoke "make" "training-install"))) + (add-after 'install 'install-minimal-tessdata + ;; tesseract-ocr cannot be used without its trained models data; + ;; install the English language as a minimal base which can be + ;; extended via TESSDATA_PREFIX. + (lambda* (#:key native-inputs inputs #:allow-other-keys) + (define eng.traineddata + "/share/tesseract-ocr/tessdata/eng.traineddata") + (install-file (search-input-file (or native-inputs inputs) + eng.traineddata) + (dirname (string-append #$output + eng.traineddata)))))))) (native-inputs (list asciidoc autoconf @@ -152,13 +172,18 @@ models for the Tesseract OCR Engine.") libtool libxml2 ;for XML_CATALOG_FILES libxslt - pkg-config)) + pkg-config + tesseract-ocr-tessdata-fast)) (inputs (list cairo icu4c leptonica pango python-wrapper)) + (native-search-paths (list (search-path-specification + (variable "TESSDATA_PREFIX") + (files (list "share/tesseract-ocr/tessdata")) + (separator #f)))) ;single value (home-page "https://github.com/tesseract-ocr/tesseract") (synopsis "Optical character recognition engine") (description @@ -166,7 +191,9 @@ models for the Tesseract OCR Engine.") high accuracy. It supports many languages, output text formatting, hOCR positional information and page layout analysis. Several image formats are supported through the Leptonica library. It can also detect whether text is -monospaced or proportional.") +monospaced or proportional. Support for the English language is included by +default. To add support for more languages, the +@code{tesseract-ocr-tessdata-fast} package should be installed.") (license license:asl2.0))) (define-public gimagereader |