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64 lines
2.1 KiB
Nix
64 lines
2.1 KiB
Nix
{ stdenv, fetchFromGitHub, autoreconfHook, pkgconfig
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, leptonica, libpng, libtiff, icu, pango, opencl-headers
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# Supported list of languages or `null' for all available languages
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, enableLanguages ? null
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}:
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stdenv.mkDerivation rec {
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name = "tesseract-${version}";
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version = "3.05.00";
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src = fetchFromGitHub {
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owner = "tesseract-ocr";
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repo = "tesseract";
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rev = version;
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sha256 = "11wrpcfl118wxsv2c3w2scznwb48c4547qml42s2bpdz079g8y30";
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};
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tessdata = fetchFromGitHub {
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owner = "tesseract-ocr";
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repo = "tessdata";
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rev = "3cf1e2df1fe1d1da29295c9ef0983796c7958b7d";
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sha256 = "1v4b63v5nzcxr2y3635r19l7lj5smjmc9vfk0wmxlryxncb4vpg7";
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};
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nativeBuildInputs = [ pkgconfig autoreconfHook ];
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buildInputs = [ leptonica libpng libtiff icu pango opencl-headers ];
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LIBLEPT_HEADERSDIR = "${leptonica}/include";
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# Copy the .traineddata files of the languages specified in enableLanguages
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# into `$out/share/tessdata' and check afterwards if copying was successful.
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postInstall = let
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mkArg = lang: "-iname ${stdenv.lib.escapeShellArg "${lang}.traineddata"}";
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mkFindArgs = stdenv.lib.concatMapStringsSep " -o " mkArg;
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findLangArgs = if enableLanguages != null
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then "\\( ${mkFindArgs enableLanguages} \\)"
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else "-iname '*.traineddata'";
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in ''
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numLangs="$(find "$tessdata" -mindepth 1 -maxdepth 1 -type f \
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${findLangArgs} -exec cp -t "$out/share/tessdata" {} + -print | wc -l)"
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${if enableLanguages != null then ''
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expected=${toString (builtins.length enableLanguages)}
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'' else ''
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expected="$(ls -1 "$tessdata/"*.traineddata | wc -l)"
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''}
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if [ "$numLangs" -ne "$expected" ]; then
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echo "Expected $expected languages, but $numLangs" \
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"were copied to \`$out/share/tessdata'" >&2
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exit 1
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fi
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'';
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meta = {
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description = "OCR engine";
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homepage = https://github.com/tesseract-ocr/tesseract;
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license = stdenv.lib.licenses.asl20;
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maintainers = with stdenv.lib.maintainers; [viric];
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platforms = with stdenv.lib.platforms; linux ++ darwin;
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};
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}
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