84 lines
2.2 KiB
Bash
84 lines
2.2 KiB
Bash
# Copyright 2022 Gentoo Authors
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# Distributed under the terms of the GNU General Public License v2
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# @ECLASS: app-alternatives.eclass
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# @MAINTAINER:
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# Michał Górny <mgorny@gentoo.org>
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# @AUTHOR:
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# Michał Górny <mgorny@gentoo.org>
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# @SUPPORTED_EAPIS: 8
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# @BLURB: Common logic for app-alternatives/*
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# @DESCRIPTION:
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# This eclass provides common logic shared by app-alternatives/*
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# ebuilds. A global ALTERNATIVES variable needs to be declared
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# that lists available options and their respective dependencies.
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# HOMEPAGE, S, LICENSE, SLOT, IUSE, REQUIRED_USE and RDEPEND are set.
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# A get_alternative() function is provided that determines the selected
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# alternative and prints its respective flag name.
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case ${EAPI} in
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8) ;;
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*) die "${ECLASS}: EAPI ${EAPI:-0} unsupported."
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esac
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if [[ ! ${_APP_ALTERNATIVES_ECLASS} ]]; then
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_APP_ALTERNATIVES_ECLASS=1
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# @ECLASS_VARIABLE: ALTERNATIVES
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# @PRE_INHERIT
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# @REQUIRED
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# @DESCRIPTION:
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# Array of "flag:dependency" pairs specifying the available
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# alternatives. The default provider must be listed first.
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# @FUNCTION: _app-alternatives_set_globals
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# @INTERNAL
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# @DESCRIPTION:
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# Set ebuild metadata variables.
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_app-alternatives_set_globals() {
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debug-print-function ${FUNCNAME} "${@}"
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if [[ ${ALTERNATIVES@a} != *a* ]]; then
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die 'ALTERNATIVES must be an array.'
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elif [[ ${#ALTERNATIVES[@]} -eq 0 ]]; then
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die 'ALTERNATIVES must not be empty.'
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fi
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HOMEPAGE="https://wiki.gentoo.org/wiki/Project:Base/Alternatives"
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S=${WORKDIR}
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LICENSE="CC0-1.0"
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SLOT="0"
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# yep, that's a cheap hack adding '+' to the first flag
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IUSE="+${ALTERNATIVES[*]%%:*}"
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REQUIRED_USE="^^ ( ${ALTERNATIVES[*]%%:*} )"
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RDEPEND=""
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local flag dep
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for flag in "${ALTERNATIVES[@]}"; do
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[[ ${flag} != *:* ]] && die "Invalid ALTERNATIVES item: ${flag}"
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dep=${flag#*:}
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flag=${flag%%:*}
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RDEPEND+="
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${flag}? ( ${dep} )
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"
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done
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}
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_app-alternatives_set_globals
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# @FUNCTION: get_alternative
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# @DESCRIPTION:
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# Get the flag name for the selected alternative (i.e. the USE flag set).
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get_alternative() {
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debug-print-function ${FUNCNAME} "${@}"
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local flag
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for flag in "${ALTERNATIVES[@]%%:*}"; do
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usev "${flag}" && return
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done
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die "No selected alternative found (REQUIRED_USE ignored?!)"
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}
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fi
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