On Sat, 2022-12-03 at 09:19 +0100, Ulrich Mueller wrote:
> > > > > > On Sat, 03 Dec 2022, Michał Górny wrote:
>
> > --- /dev/null
> > +++ b/eclass/app-alternatives.eclass
> > @@ -0,0 +1,84 @@
> > +# Copyright 2022 Gentoo Authors
> > +# Distributed under the terms of the GNU General Public License v2
> > +
> > +# @ECLASS: app-alternatives.eclass
> > +# @MAINTAINER:
> > +# Michał Górny <[email protected]>
> > +# @AUTHOR:
> > +# Michał Górny <[email protected]>
> > +# @SUPPORTED_EAPIS: 8
> > +# @BLURB: Common logic for app-alternatives/*
> > +# @DESCRIPTION:
> > +# This eclass provides common logic shared by app-alternatives/*
> > +# ebuilds. A global ALTERNATIVES variable needs to be declared
> > +# that lists available options and their respective dependencies.
> > +# HOMEPAGE, S, LICENSE, SLOT, IUSE, REQUIRED_USE and RDEPEND are
> > set.
> > +# A get_alternative() function is provided that prints the
> > determines
>
> Grammar?
Nope, ^w error.
>
> > +# the selected alternative and prints its respective flag name.
> > +
> > +case ${EAPI} in
> > + 8) ;;
> > + *) die "${ECLASS}: EAPI ${EAPI} unsupported."
>
> ${EAPI:-0} here?
Sure.
>
> > +esac
> > +
> > +if [[ ! ${_APP_ALTERNATIVES_ECLASS} ]]; then
> > +_APP_ALTERNATIVES_ECLASS=1
> > +
> > +# @ECLASS_VARIABLE: ALTERNATIVES
> > +# @PRE_INHERIT
> > +# @REQUIRED
> > +# @DESCRIPTION:
> > +# Array of "flag:dependency" pairs specifying the available
> > +# alternatives. The default provider must be listed first.
> > +
> > +# @FUNCTION: _app-alternatives_set_globals
> > +# @INTERNAL
> > +# @DESCRIPTION:
> > +# Set ebuild metadata variables.
> > +_app-alternatives_set_globals() {
> > + debug-print-function ${FUNCNAME} "${@}"
> > +
> > + if [[ $(declare -p ALTERNATIVES) != "declare -a"* ]]; then
>
> The more modern (and presumably, more reliable) check would be:
>
> if [[ ${ALTERNATIVES@a} != *a* ]]; then
>
> Since the eclass supports EAPI 8 only, bash-5.0 is guaranteed, so the
> feature will be available.
Ok.
>
> > + die 'ALTERNATIVES must be an array.'
> > + elif [[ ${#ALTERNATIVES[@]} -eq 0 ]]; then
> > + die 'ALTERNATIVES must not be empty.'
> > + fi
> > +
> > + HOMEPAGE="
> > https://wiki.gentoo.org/wiki/Project:Base/Alternatives";
> > + S=${WORKDIR}
> > +
> > + LICENSE="CC0-1.0"
> > + SLOT="0"
> > +
> > + # yep, that's a cheap hack adding '+' to the first flag
> > + IUSE="+${ALTERNATIVES[*]%%:*}"
> > + REQUIRED_USE="^^ ( ${ALTERNATIVES[*]%%:*} )"
> > + RDEPEND=""
> > +
> > + local flag dep
> > + for flag in "${ALTERNATIVES[@]}"; do
> > + [[ ${flag} != *:* ]] && die "Invalid ALTERNATIVES
> > item: ${flag}"
> > + dep=${flag#*:}
> > + flag=${flag%%:*}
> > + RDEPEND+="
> > + ${flag}? ( ${dep} )
> > + "
>
> Why two newlines? A single space should be enough.
What's the difference? It will be normalized by the PM anyway.
>
> > + done
> > +}
> > +_app-alternatives_set_globals
> > +
> > +# @FUNCTION: get_alternative
> > +# @DESCRIPTION:
> > +# Get the flag name for the selected alterantive (i.e. the USE flag
> > set).
>
> Typo.
Sam already spotted this one.
--
Best regards,
Michał Górny
