# Copyright 1999-2019 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2

EAPI=7

MY_PN="tesseract-ocr"
LANGPACKV="4.00"
URI_PREFIX="https://github.com/${MY_PN}/tessdata/raw/${LANGPACKV}/"

inherit autotools toolchain-funcs

DESCRIPTION="An OCR Engine, orginally developed at HP, now open source."
HOMEPAGE="https://github.com/tesseract-ocr"
SRC_URI="https://github.com/${MY_PN}/${PN}/archive/${PV}.tar.gz -> ${P}.tar.gz
	${URI_PREFIX}eng.traineddata -> eng.traineddata-${LANGPACKV}
	math? ( ${URI_PREFIX}equ.traineddata -> equ.traineddata-${LANGPACKV} )
	osd? ( ${URI_PREFIX}osd.traineddata -> osd.traineddata-${LANGPACKV} )"

LICENSE="Apache-2.0"
SLOT="0"
KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~mips ~ppc ~ppc64 ~sparc ~x86"
IUSE="doc jpeg math opencl openmp osd png static-libs tiff training webp"

# List of supported Gentoo linguas and their upstream mapping
# https://github.com/tesseract-ocr/tesseract/wiki/Data-Files
# "old" variants were regrouped in the matching modern locale
LANGUAGES="af:afr am:amh ar:ara as:asm az:aze,aze_cyrl be:bel bn:ben bo:bod bs:bos bg:bul ca:cat cs:ces zh:chi_sim,chi_tra cy:cym da:dan de:deu,frk dz:dzo el:ell,grc en:enm eo:epo et:est eu:eus fa:fas fi:fin fr:fra,frm ga:gle gl:glg gu:guj he:heb hi:hin hr:hrv hu:hun id:ind is:isl it:ita,ita_old ja:jpn kn:kan ka:kat,kat_old kk:kaz km:khm ky:kir ko:kor ku:kur lo:lao la:lat lv:lav lt:lit ml:mal mr:mar mk:mkd ms:msa my:mya ne:nep nl:nld no:nor or:ori pa:pan pl:pol pt:por ro:ron ru:rus sa:san si:sin sk:slk sl:slv es:spa,spa_old sq:sqi sr:srp,srp_latn sw:swa sv:swe syc:syr ta:tam te:tel tg:tgk tl:tgl th:tha tr:tur ug:uig uk:ukr uz:uzb,uzb_cyrl vi:vie"
# Missing matches:
#	ceb 	Cebuano
#	chr 	Cherokee
#	hat 	Haitian; Haitian Creole
#	iku 	Inuktitut
#	jav 	Javanese
#	mlt 	Maltese
#	pus 	Pushto; Pashto
#	tir 	Tigrinya
#	urd 	Urdu
#	yid 	Yiddish
# l10n_en provides the additional data:
#	enm 	English, Middle (1100-1500)

for lang in ${LANGUAGES}; do
	gentoo_lang=${lang%:*}
	tess_langs=${lang#*:}
	for tess_lang in ${tess_langs//,/ }; do
		SRC_URI+=" l10n_${gentoo_lang}? ( ${URI_PREFIX}${tess_lang}.traineddata -> ${tess_lang}.traineddata-${LANGPACKV} )"
	done
	IUSE+=" l10n_${gentoo_lang}"
done

# With opencl USE=tiff is necessary in leptonica
RDEPEND=">=media-libs/leptonica-1.74:=[zlib,tiff?,jpeg?,png?,webp?]
	opencl? (
		virtual/opencl
		media-libs/tiff:0=
		media-libs/leptonica:=[tiff]
	)
	training? (
		dev-libs/icu:=
		x11-libs/pango:=
		x11-libs/cairo:=
	)"

DEPEND="${RDEPEND}
	app-text/asciidoc
	app-text/docbook-xsl-stylesheets
	dev-libs/libxslt
	doc? ( app-doc/doxygen )"

DOCS=( AUTHORS ChangeLog README.md )

PATCHES=(
	"${FILESDIR}"/${P}-manpages.patch
)

pkg_pretend() {
	[[ ${MERGE_TYPE} != binary ]] && use openmp && tc-check-openmp
}

pkg_setup() {
	[[ ${MERGE_TYPE} != binary ]] && use openmp && tc-check-openmp
}

src_unpack() {
	unpack ${P}.tar.gz
	for file in ${A}; do
		if [[ "${file}" == *traineddata* ]]; then
			cp "${DISTDIR}/${file}" "${S}/tessdata/${file%-*}" || die
		fi
	done
}

src_prepare() {
	default
	eautoreconf
}

src_configure() {
	# scrollview disabled for now, see bug #686944
	local myeconfargs=(
		--enable-shared
		--disable-graphics
		$(use_enable opencl)
		$(use_enable openmp)
		$(use_enable static-libs static)
	)

	econf "${myeconfargs[@]}"
}

src_compile() {
	default
	use doc && emake doc
	use training && emake training
}

src_install() {
	use doc && HTML_DOCS=( doc/html/. )
	default

	find "${D}" -name '*.la' -type f -delete || die

	if use training; then
		emake DESTDIR="${D}" training-install
	fi

	insinto /usr/share/tessdata
	doins tessdata/*traineddata* # language files
}