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{ lib, stdenv, makeWrapper, tesseractBase, languages
# A list of languages like [ "eng" "spa" … ] or `null` for all available languages
, enableLanguages ? null
# A list of files or a directory containing files
, tessdata ? (if enableLanguages == null then languages.all
else map (lang: languages.${lang}) enableLanguages)
# This argument is obsolete
, enableLanguagesHash ? null
}:
let
passthru = { inherit tesseractBase languages tessdata; };
tesseractWithData = tesseractBase.overrideAttrs (_: {
inherit tesseractBase tessdata;
buildInputs = [ makeWrapper ];
buildCommand = ''
makeWrapper {$tesseractBase,$out}/bin/tesseract --set-default TESSDATA_PREFIX $out/share/tessdata
# Recursively link include, share
cp -rs --no-preserve=mode $tesseractBase/{include,share} $out
cp -r --no-preserve=mode $tesseractBase/lib $out
# Fixup the store paths in lib so that the tessdata from this derivation is used.
if (( ''${#tesseractBase} != ''${#out} )); then
echo "Can't replace store paths due to differing lengths"
exit 1
fi
find $out/lib -type f -exec sed -i "s|$tesseractBase|$out|g" {} \;
if [[ -d "$tessdata" ]]; then
ln -s $tessdata/* $out/share/tessdata
else
for lang in $tessdata; do
ln -s $lang $out/share/tessdata/''${lang#/nix/store*-}
done
fi
if [[ ! -e $out/share/tessdata/eng.traineddata ]]; then
# This is a bug in Tesseract's internal tessdata discovery mechanism
echo "eng.traineddata must be present in tessdata for Tesseract to work"
exit 1
fi
'';
});
tesseract = (if enableLanguages == [] then tesseractBase else tesseractWithData) // passthru;
in
if enableLanguagesHash == null then
tesseract
else
lib.warn "Argument `enableLanguagesHash` is obsolete and can be removed."
tesseract
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