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+# Copyright 1999-2020 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+# @ECLASS: docs.eclass
+# @MAINTAINER:
+# Andrew Ammerlaan <andrewammerlaan@riseup.net>
+# @AUTHOR:
+# Author: Andrew Ammerlaan <andrewammerlaan@riseup.net>
+# Based on the work of: Michał Górny <mgorny@gentoo.org>
+# @SUPPORTED_EAPIS: 6 7
+# @BLURB: A simple eclass to build documentation.
+# @DESCRIPTION:
+# A simple eclass providing functions to build documentation.
+#
+# Please note that docs sets RDEPEND and DEPEND unconditionally
+# for you.
+#
+# This eclass also appends "doc" to IUSE, and sets HTML_DOCS
+# to the location of the compiled documentation
+#
+# The aim of this eclass is to make it easy to add additional
+# doc builders. To do this, add a <DOCS_BUILDER>-setup and
+# <DOCS_BUILDER>-build function for your doc builder.
+# For python based doc builders you can use the
+# python_append_deps function to append [${PYTHON_USEDEP}]
+# automatically to additional dependencies.
+
+case "${EAPI:-0}" in
+	0|1|2|3|4|5)
+		die "Unsupported EAPI=${EAPI:-0} (too old) for ${ECLASS}"
+		;;
+	6|7)
+		;;
+	*)
+		die "Unsupported EAPI=${EAPI} (unknown) for ${ECLASS}"
+		;;
+esac
+
+# @ECLASS-VARIABLE: DOCS_BUILDER
+# @REQUIRED
+# @PRE_INHERIT
+# @DESCRIPTION:
+# Sets the doc builder to use, currently supports
+# sphinx, mkdocs and doxygen.
+# PYTHON_COMPAT should be set for python based
+# doc builders: sphinx and mkdocs
+
+# @ECLASS-VARIABLE: DOCS_DIR
+# @DESCRIPTION:
+# Path containing the doc builder config file(s).
+#
+# For sphinx this is the location of "conf.py"
+# For mkdocs this is the location of "mkdocs.yml"
+#
+# Note that mkdocs.yml often does not reside
+# in the same directory as the actual doc files
+#
+# Defaults to ${S}
+
+# @ECLASS-VARIABLE: DOCS_DEPEND
+# @DEFAULT_UNSET
+# @PRE_INHERIT
+# @DESCRIPTION:
+# Sets additional dependencies to build docs.
+# For sphinx and mkdocs these dependencies should
+# be specified without [${PYTHON_USEDEP}], this
+# is added by the eclass. E.g. to depend on mkdocs-material:
+#
+# DOCS_DEPEND="dev-python/mkdocs-material"
+#
+# This eclass appends to this variable, so you can
+# call it later in your ebuild again if necessary.
+
+# @ECLASS-VARIABLE: DOCS_AUTODOC
+# @PRE_INHERIT
+# @DESCRIPTION:
+# Sets whether to use sphinx.ext.autodoc/mkautodoc
+# Defaults to 1 (True) for sphinx, and 0 (False) for mkdocs
+
+# @ECLASS-VARIABLE: DOCS_EXTRA_ARGS
+# @DESCRIPTION:
+# Extra arguments to parse to the DOCS_BUILDER
+
+# @ECLASS-VARIABLE: DOCS_OUTDIR
+# @DESCRIPTION:
+# Sets where the compiled files will be put.
+# There's no real reason to change this, but this
+# variable is useful if you want to overwrite the HTML_DOCS
+# added by this eclass. E.g.:
+#
+# HTML_DOCS=( "${yourdocs}" "${DOCS_OUTDIR}/." )
+#
+# Defaults to ${DOCS_DIR}/_build/html
+
+# @ECLASS-VARIABLE: DOCS_CONFIG_NAME
+# @DESCRIPTION:
+# Name of the doc builder config file.
+#
+# Only relevant for doxygen, as it allows
+# config files with non-standard names
+#
+# Defaults to Doxyfile for doxygen
+
+if [[ ! ${_DOCS} ]]; then
+
+# For the python based DOCS_BUILDERS we need to inherit python-any-r1
+case ${DOCS_BUILDER} in
+	"sphinx"|"mkdocs")
+		# We need the python_gen_any_dep function
+		if [[ ! ${_PYTHON_R1} && ! ${_PYTHON_ANY_R1} ]]; then
+			die "python-r1 or python-any-r1 needs to be inherited as well to use python based documentation builders"
+		fi
+		;;
+	"doxygen")
+		# do not need to inherit anything for doxygen
+		;;
+	"")
+		die "DOCS_BUILDER unset, should be set to use ${ECLASS}"
+		;;
+	*)
+		die "Unsupported DOCS_BUILDER=${DOCS_BUILDER} (unknown) for ${ECLASS}"
+		;;
+esac
+
+# @FUNCTION: python_check_deps
+# @DESCRIPTION:
+# Check if the dependencies are valid
+python_check_deps() {
+	debug-print-function ${FUNCNAME}
+	use doc || return 0
+
+	local dep
+	for dep in ${CHECK_DEPS[@]}; do
+		has_version "${dep}[${PYTHON_USEDEP}]" || return 1
+	done
+}
+# Save this before we start manipulating it
+CHECK_DEPS=${DOCS_DEPEND}
+
+# @FUNCTION: python_append_dep
+# @DESCRIPTION:
+# Appends [\${PYTHON_USEDEP}] to all dependencies
+# for python based DOCS_BUILDERs such as mkdocs or
+# sphinx.
+python_append_deps() {
+	debug-print-function ${FUNCNAME}
+
+	local temp=()
+	local dep
+	for dep in ${DOCS_DEPEND[@]}; do
+		temp+=(" ${dep}[\${PYTHON_USEDEP}]")
+	done
+	DOCS_DEPEND=${temp}
+}
+
+# @FUNCTION: sphinx_deps
+# @DESCRIPTION:
+# Sets dependencies for sphinx
+sphinx_deps() {
+	debug-print-function ${FUNCNAME}
+
+	: ${DOCS_AUTODOC:=1}
+
+	if [[ ${DOCS_AUTODOC} == 0 ]]; then
+		if [[ -n "${DOCS_DEPEND}" ]]; then
+			die "${FUNCNAME}: do not set DOCS_AUTODOC to 0 if external plugins are used"
+		else
+			DOCS_DEPEND="dev-python/sphinx"
+		fi
+	elif [[ ${DOCS_AUTODOC} == 1 ]]; then
+		DOCS_DEPEND="$(python_gen_any_dep "
+			dev-python/sphinx[\${PYTHON_USEDEP}]
+			${DOCS_DEPEND}")"
+	else
+		die "${FUNCNAME}: DOCS_AUTODOC should be set to 0 or 1"
+	fi
+}
+
+# @FUNCTION: sphinx_compile
+# @DESCRIPTION:
+# Calls sphinx to build docs.
+#
+# If you overwrite src_compile or python_compile_all
+# do not call this function, call docs_compile instead
+sphinx_compile() {
+	debug-print-function ${FUNCNAME}
+	use doc || return
+
+	local confpy=${DOCS_DIR}/conf.py
+	[[ -f ${confpy} ]] ||
+		die "${FUNCNAME}: ${confpy} not found, DOCS_DIR=${DOCS_DIR} call wrong"
+
+	if [[ ${DOCS_AUTODOC} == 0 ]]; then
+		if grep -F -q 'sphinx.ext.autodoc' "${confpy}"; then
+			die "${FUNCNAME}: autodoc disabled but sphinx.ext.autodoc found in ${confpy}"
+		fi
+	elif [[ ${DOCS_AUTODOC} == 1 ]]; then
+		if ! grep -F -q 'sphinx.ext.autodoc' "${confpy}"; then
+			die "${FUNCNAME}: sphinx.ext.autodoc not found in ${confpy}, set DOCS_AUTODOC=0"
+		fi
+	fi
+
+	sed -i -e 's:^intersphinx_mapping:disabled_&:' \
+		"${DOCS_DIR}"/conf.py || die
+	# not all packages include the Makefile in pypi tarball
+	sphinx-build "${DOCS_EXTRA_ARGS}" -b html -d "${DOCS_DIR}"/_build/doctrees "${DOCS_DIR}" \
+	"${DOCS_OUTDIR}" || die "${FUNCNAME}: sphinx-build failed"
+}
+
+# @FUNCTION: mkdocs_deps
+# @DESCRIPTION:
+# Sets dependencies for mkdocs
+mkdocs_deps() {
+	debug-print-function ${FUNCNAME}
+
+	: ${DOCS_AUTODOC:=0}
+
+	if [[ ${DOCS_AUTODOC} == 1 ]]; then
+		DOCS_DEPEND="$(python_gen_any_dep "
+			dev-python/mkdocs[\${PYTHON_USEDEP}]
+			dev-python/mkautodoc[\${PYTHON_USEDEP}]
+		${DOCS_DEPEND}")"
+	elif [[ ${DOCS_AUTODOC} == 0 ]]; then
+		DOCS_DEPEND="$(python_gen_any_dep "
+			dev-python/mkdocs[\${PYTHON_USEDEP}]
+			${DOCS_DEPEND}")"
+	else
+		die "${FUNCNAME}: DOCS_AUTODOC should be set to 0 or 1"
+	fi
+}
+
+# @FUNCTION: mkdocs_compile
+# @DESCRIPTION:
+# Calls mkdocs to build docs.
+#
+# If you overwrite src_compile or python_compile_all
+# do not call this function, call docs_compile instead
+mkdocs_compile() {
+	debug-print-function ${FUNCNAME}
+	use doc || return
+
+	local mkdocsyml=${DOCS_DIR}/mkdocs.yml
+	[[ -f ${mkdocsyml} ]] ||
+		die "${FUNCNAME}: ${mkdocsyml} not found, DOCS_DIR=${DOCS_DIR} wrong"
+
+	pushd "${DOCS_DIR}" || die
+	mkdocs build "${DOCS_EXTRA_ARGS}" -d "${DOCS_OUTDIR}" || die "${FUNCNAME}: mkdocs build failed"
+	popd || die
+
+	# remove generated .gz variants
+	# mkdocs currently has no option to disable this
+	# and portage complains: "Colliding files found by ecompress"
+	rm "${DOCS_OUTDIR}"/*.gz || die
+}
+
+# @FUNCTION: doxygen_deps
+# @DESCRIPTION:
+# Sets dependencies for doxygen
+doxygen_deps() {
+	debug-print-function ${FUNCNAME}
+
+	DOCS_DEPEND="app-doc/doxygen
+		${DOCS_DEPEND}"
+}
+
+# @FUNCTION: doxygen_compile
+# @DESCRIPTION:
+# Calls doxygen to build docs.
+#
+# If you overwrite src_compile or python_compile_all
+# do not call this function, call docs_compile instead
+doxygen_compile() {
+	debug-print-function ${FUNCNAME}
+	use doc || return
+
+	: ${DOCS_CONFIG_NAME:="Doxyfile"}
+
+	local doxyfile=${DOCS_DIR}/${DOCS_CONFIG_NAME}
+	[[ -f ${doxyfile} ]] ||
+		die "${FUNCNAME}: ${doxyfile} not found, DOCS_DIR=${DOCS_DIR} or DOCS_CONFIG_NAME=${DOCS_CONFIG_NAME} wrong"
+
+	# doxygen wants the HTML_OUTPUT dir to already exist
+	mkdir -p "${DOCS_OUTDIR}" || die
+
+	pushd "${DOCS_DIR}" || die
+	(cat "${doxyfile}" ; echo "HTML_OUTPUT=${DOCS_OUTDIR}") | doxygen "${DOCS_EXTRA_ARGS}" - || die "${FUNCNAME}: doxygen failed"
+	popd || die
+}
+
+# @FUNCTION: docs_compile
+# @DESCRIPTION:
+# Calls DOCS_BUILDER and sets HTML_DOCS
+#
+# This function must be called in global scope.  Take care not to
+# overwrite the variables set by it. Has support for distutils-r1
+# eclass, but only if this eclass is inherited *after*
+# distutils-r1. If you need to extend src_compile() or
+# python_compile_all(), you can call the original implementation
+# as docs_compile.
+docs_compile() {
+	debug-print-function ${FUNCNAME}
+	use doc || return
+
+	# Set a sensible default as DOCS_DIR
+	: ${DOCS_DIR:="${S}"}
+
+	# Where to put the compiled files?
+	: ${DOCS_OUTDIR:="${DOCS_DIR}/_build/html"}
+
+	${DOCS_BUILDER}_compile
+
+	HTML_DOCS+=( "${DOCS_OUTDIR}/." )
+
+	# we need to ensure successful return in case we're called last,
+	# otherwise Portage may wrongly assume sourcing failed
+	return 0
+}
+
+
+# This is where we setup the USE/(B)DEPEND variables
+# and call the doc builder specific setup functions
+IUSE+=" doc"
+
+# Call the correct setup function
+case ${DOCS_BUILDER} in
+	"sphinx")
+		python_append_deps
+		sphinx_deps
+		;;
+	"mkdocs")
+		python_append_deps
+		mkdocs_deps
+		;;
+	"doxygen")
+		doxygen_deps
+		;;
+esac
+
+if [[ ${EAPI} == [7] ]]; then
+	BDEPEND+=" doc? ( ${DOCS_DEPEND} )"
+else
+	DEPEND+=" doc? ( ${DOCS_DEPEND} )"
+fi
+
+# If this is a python package using distutils-r1
+# then put the compile function in the specific
+# python function, else docs_compile should be manually
+# added to src_compile
+if [[ ${_DISTUTILS_R1} && ( ${DOCS_BUILDER}="mkdocs" || ${DOCS_BUILDER}="sphinx" ) ]]; then
+	python_compile_all() { docs_compile; }
+fi
+
+_DOCS=1
+fi