eclass/gradle.eclass


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# Copyright 2021-2023 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2

# @ECLASS: gradle.eclass
# @MAINTAINER:
# Gentoo Java Project <java@gentoo.org>
# @AUTHOR:
# Florian Schmaus <flow@gentoo.org>
# @BLURB: Utility functions for the gradle build system.
# @DESCRIPTION:
# Utility functions for the gradle build system.
# WARNING: This eclass is currently experimental and
# subject to change.

case ${EAPI} in
	7|8) ;;
	*) die "${ECLASS}: EAPI ${EAPI:-0} not supported" ;;
esac

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

inherit edo

# @ECLASS_VARIABLE: EGRADLE_MIN
# @DEFAULT_UNSET
# @DESCRIPTION:
# Minimum required gradle version.

# @ECLASS_VARIABLE: EGRADLE_MAX_EXCLUSIVE
# @DEFAULT_UNSET
# @DESCRIPTION:
# First gradle version that is not supported.

# @ECLASS_VARIABLE: EGRADLE_EXACT_VER
# @DEFAULT_UNSET
# @DESCRIPTION:
# The exactly required gradle version.

# @ECLASS_VARIABLE: EGRADLE_PARALLEL
# @DESCRIPTION:
# Set to the 'true', the default, to invoke gradle with --parallel. Set
# to 'false' to disable parallel gradle builds.
: ${EGRADLE_PARALLEL=true}

# @ECLASS_VARIABLE: EGRADLE_USER_HOME
# @DESCRIPTION:
# Directroy used the user's home directory by gradle.
EGRADLE_USER_HOME="${T}/gradle_user_home"

# @ECLASS_VARIABLE: EGRADLE_OVERWRITE
# @USER_VARIABLE
# @DEFAULT_UNSET
# @DESCRIPTION:
# User-specified overwrite of the used gradle binary.

# @FUNCTION: gradle-set_EGRADLE
# @DESCRIPTION:
# Set the EGRADLE environment variable.
gradle-set_EGRADLE() {
	[[ -n ${EGRADLE} ]] && return

	if [[ -n ${EGRADLE_OVERWRITE} ]]; then
		export EGRADLE="${EGRADLE_OVERWRITE}"
		return
	fi

	local candidates candidate selected selected_ver

	candidates=$(compgen -c gradle-)
	for candidate in ${candidates}; do
		if [[ ! ${candidate} =~ gradle(-bin)?-([.0-9]+) ]]; then
			continue
		fi

		local ver
		if (( ${#BASH_REMATCH[@]} == 3 )); then
			ver="${BASH_REMATCH[2]}"
		else
			ver="${BASH_REMATCH[1]}"
		fi

		if [[ -n ${EGRADLE_EXACT_VER} ]]; then
			ver_test "${ver}" -ne ${EGRADLE_EXACT_VER} && continue

			selected="${candidate}"
			selected_ver="${ver}"
			break
		fi

		if [[ -n ${EGRADLE_MIN} ]] \
			   && ver_test "${ver}" -lt "${EGRADLE_MIN}"; then
			# Candidate does not satisfy EGRADLE_MIN condition.
			continue
		fi

		if [[ -n ${EGRADLE_MAX_EXCLUSIVE} ]] \
			   && ver_test "${ver}" -ge "${EGRADLE_MAX_EXCLUSIVE}"; then
			# Candidate does not satisfy EGRADLE_MAX_EXCLUSIVE condition.
			continue
		fi

		if [[ -n ${selected_ver} ]] \
			   && ver_test "${selected_ver}" -gt "${ver}"; then
			# Candidate is older than the currently selected candidate.
			continue
		fi

		selected="${candidate}"
		selected_ver="${ver}"
	done

	if [[ -z ${selected} ]]; then
		die "Could not find (suitable) gradle installation in PATH"
	fi

	export EGRADLE="${selected}"
	export EGRADLE_VER="${ver}"
}

# @FUNCTION: egradle
# @USAGE: [gradle-args]
# @DESCRIPTION:
# Invoke gradle with the optionally provided arguments.
egradle() {
	gradle-set_EGRADLE

	# TODO --no-build-cache ?
	local gradle_args=(
		--console=plain
		--info
		--stacktrace
		--no-daemon
		--offline
		--no-build-cache
		--gradle-user-home "${EGRADLE_USER_HOME}"
		--project-cache-dir "${T}/gradle_project_cache"
	)

	if $EGRADLE_PARALLEL; then
		gradle_args+=( --parallel )
	fi

	local -x JAVA_TOOL_OPTIONS="-Duser.home=\"$T\""
	# TERM needed, otherwise gradle may fail on terms it does not know about
	TERM=xterm \
		edo \
		"${EGRADLE}" "${gradle_args[@]}" ${@}
}

fi