# Copyright 1999-2020 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2

# @ECLASS: texlive-common.eclass
# @MAINTAINER:
# tex@gentoo.org
# @AUTHOR:
# Original Author: Alexis Ballier <aballier@gentoo.org>
# @SUPPORTED_EAPIS: 7
# @BLURB: Provide various functions used by both texlive-core and texlive modules
# @DESCRIPTION:
# Purpose: Provide various functions used by both texlive-core and texlive
# modules.
#
# Note that this eclass *must* not assume the presence of any standard tex too

if [[ -z ${_TEXLIVE_COMMON_ECLASS} ]]; then
_TEXLIVE_COMMON_ECLASS=1

case ${EAPI:-0} in
	[0-6]) die "Unsupported EAPI=${EAPI:-0} (too old) for ${ECLASS}" ;;
	7)     ;;
	*)     die "Unsupported EAPI=${EAPI} (unknown) for ${ECLASS}" ;;
esac

TEXMF_PATH=/usr/share/texmf
TEXMF_DIST_PATH=/usr/share/texmf-dist
TEXMF_VAR_PATH=/var/lib/texmf

# @FUNCTION: texlive-common_handle_config_files
# @DESCRIPTION:
# Has to be called in src_install after having installed the files in ${D}
# This function will move the relevant files to /etc/texmf and symling them
# from their original location. This is to allow easy update of texlive's
# configuration

texlive-common_handle_config_files() {
	# Handle config files properly
	[[ -d ${ED}${TEXMF_PATH} ]] || return
	cd "${ED}${TEXMF_PATH}" || die

	while read -r f; do
		if [[ ${f#*config} != ${f} || ${f#doc} != ${f} || ${f#source} != ${f} || ${f#tex} != ${f} ]] ; then
			continue
		fi
		dodir /etc/texmf/$(dirname ${f}).d
		einfo "Moving (and symlinking) ${EPREFIX}${TEXMF_PATH}/${f} to ${EPREFIX}/etc/texmf/$(dirname ${f}).d"
		mv "${ED}/${TEXMF_PATH}/${f}" "${ED}/etc/texmf/$(dirname ${f}).d" || die "mv ${f} failed."
		dosym /etc/texmf/$(dirname ${f}).d/$(basename ${f}) ${TEXMF_PATH}/${f}
	done < <(find  -name '*.cnf' -type f -o -name '*.cfg' -type f | sed -e "s:\./::g")
}

# @FUNCTION: texlive-common_is_file_present_in_texmf
# @DESCRIPTION:
# Return if a file is present in the texmf tree
# Call it from the directory containing texmf and texmf-dist

texlive-common_is_file_present_in_texmf() {
	local mark="${T}/${1}.found"
	if [[ -d texmf ]]; then
		find texmf -name ${1} -exec touch ${mark} {} + || die
	fi

	if [[ -d texmf-dist ]]; then
		find texmf-dist -name ${1} -exec touch ${mark} {} + || die
	fi
}

# @FUNCTION: texlive-common_do_symlinks
# @USAGE: <src> <dest>
# @DESCRIPTION:
# Mimic the install_link function of texlinks
#
# Should have the same behavior as the one in /usr/bin/texlinks
# except that it is under the control of the package manager
# Note that $1 corresponds to $src and $2 to $dest in this function
# ( Arguments are switched because texlinks main function sends them switched )
# This function should not be called from an ebuild, prefer etexlinks that will
# also do the fmtutil file parsing.

texlive-common_do_symlinks() {
	while [[ ${#} != 0 ]]; do
		case ${1} in
			cont-??|metafun|mptopdf)
				einfo "Symlink ${1} skipped (special case)"
				;;
			mf)
				einfo "Symlink ${1} -> ${2} skipped (texlive-core takes care of it)"
				;;
			*)
				if [[ ${1} == ${2} ]]; then
					einfo "Symlink ${1} -> ${2} skipped"
				elif [[ -e ${ED}/usr/bin/${1} || -L ${ED}/usr/bin/${1} ]]; then
					einfo "Symlink ${1} skipped (file exists)"
				else
					einfo "Making symlink from ${1} to ${2}"
					dosym ${2} /usr/bin/${1}
				fi
				;;
		esac
		shift; shift;
	done
}

# @FUNCTION: etexlinks
# @USAGE: <file>
# @DESCRIPTION:
# Mimic texlinks on a fmtutil format file
#
# $1 has to be a fmtutil format file like fmtutil.cnf
# etexlinks foo will install the symlinks that texlinks --cnffile foo would have
# created. We cannot use texlinks with portage as it is not DESTDIR aware.
# (It would not fail but will not create the symlinks if the target is not in
# the same dir as the source)
# Also, as this eclass must not depend on a tex distribution to be installed we
# cannot use texlinks from here.

etexlinks() {
	# Install symlinks from formats to engines
	texlive-common_do_symlinks $(sed '/^[      ]*#/d; /^[      ]*$/d' "$1" | awk '{print $1, $2}')
}

# @FUNCTION: dobin_texmf_scripts
# @USAGE: <file1> [file2] ...
# @DESCRIPTION:
# Symlinks a script from the texmf tree to /usr/bin. Requires permissions to be
# correctly set for the file that it will point to.

dobin_texmf_scripts() {
	while [[ ${#} -gt 0 ]] ; do
		local trg=$(basename ${1} | sed 's,\.[^/]*$,,' | tr '[:upper:]' '[:lower:]')
		einfo "Installing ${1} as ${trg} bin wrapper"
		[[ -x ${ED}/usr/share/${1} ]] || die "Trying to install a non existing or non executable symlink to /usr/bin: ${1}"
		dosym ../share/${1} /usr/bin/${trg}
		shift
	done
}

# @FUNCTION: etexmf-update
# @DESCRIPTION:
# Runs texmf-update if it is available and prints a warning otherwise. This
# function helps in factorizing some code.  Useful in ebuilds' pkg_postinst and
# pkg_postrm phases.

etexmf-update() {
	if has_version 'app-text/texlive-core' ; then
		if [[ -z ${ROOT} && -x "${EPREFIX}"/usr/sbin/texmf-update ]] ; then
			"${EPREFIX}"/usr/sbin/texmf-update
		else
			ewarn "Cannot run texmf-update for some reason."
			ewarn "Your texmf tree might be inconsistent with your configuration"
			ewarn "Please try to figure what has happened"
		fi
	fi
}

# @FUNCTION: efmtutil-sys
# @DESCRIPTION:
# Runs fmtutil-sys if it is available and prints a warning otherwise. This
# function helps in factorizing some code. Used in ebuilds' pkg_postinst to
# force a rebuild of TeX formats.

efmtutil-sys() {
	if has_version 'app-text/texlive-core' ; then
		if [[ -z ${ROOT} && -x "${EPREFIX}"/usr/bin/fmtutil-sys ]] ; then
			einfo "Rebuilding formats"
			"${EPREFIX}"/usr/bin/fmtutil-sys --all &> /dev/null || die
		else
			ewarn "Cannot run fmtutil-sys for some reason."
			ewarn "Your formats might be inconsistent with your installed ${PN} version"
			ewarn "Please try to figure what has happened"
		fi
	fi
}

fi