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# Copyright 1999-2021 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2
# @ECLASS: optfeature.eclass
# @MAINTAINER:
# base-system@gentoo.org
# @BLURB: Advertise optional functionality that might be useful to users
case ${EAPI:-0} in
[0-7]) ;;
*) die "Unsupported EAPI=${EAPI} (unknown) for ${ECLASS}" ;;
esac
if [[ -z ${_OPTFEATURE_ECLASS} ]]; then
_OPTFEATURE_ECLASS=1
# @ECLASS-VARIABLE: _OPTFEATURE_DEFAULT_HEADER
# @INTERNAL
# @DESCRIPTION:
# Default header printed ahead of optfeature output. Can be overridden
# by calling optfeature_header function. Will not be displayed if all optional
# dependencies are present.
_OPTFEATURE_DEFAULT_HEADER="Install additional packages for optional runtime features:"
readonly _OPTFEATURE_DEFAULT_HEADER
# @ECLASS-VARIABLE: _OPTFEATURE_HEADER
# @INTERNAL
# @DESCRIPTION:
# Default empty. Custom header printed ahead of optfeature output.
# Set by calling optfeature_header function with the desired output, or reset
# by optfeature_header without argument. Will not be displayed if all optional
# dependencies are present.
_OPTFEATURE_HEADER=
# @ECLASS-VARIABLE: _OPTFEATURE_DOHEADER
# @INTERNAL
# @DESCRIPTION:
# If true, print header ahead of the first optfeature output.
_OPTFEATURE_DOHEADER=true
# @FUNCTION: optfeature_header
# @USAGE: [custom header for follow-up optfeature calls]
# @DESCRIPTION:
# Set a custom header for follow-up optfeature calls, or reset to default
# header by calling it without argument. This can not only be used to customize
# the header but also to distinguish optfeature "groups", e.g. to list a number
# of different possible database backends, and then a number of optional
# regular runtime features.
#
# The following snippet will leave the default header untouched for the first
# two optfeature calls. Then a custom header is set that is going to be
# displayed in case dev-db/a or dev-db/b are not installed.
# @CODE
# pkg_postinst() {
# optfeature "foo support" app-misc/foo
# optfeature "bar support" app-misc/bar
# optfeature_header "Install optional database backends:"
# optfeature "a DB backend" dev-db/a
# optfeature "b DB backend" dev-db/b
# }
# @CODE
optfeature_header() {
debug-print-function ${FUNCNAME} "$@"
_OPTFEATURE_HEADER="${1}"
_OPTFEATURE_DOHEADER=true
}
# @FUNCTION: optfeature
# @USAGE: <short description> <package atom to match> [other atoms]
# @DESCRIPTION:
# Print out a message suggesting an optional package (or packages)
# not currently installed which provides the described functionality.
#
# The following snippet would suggest app-misc/foo for optional foo support,
# app-misc/bar or app-misc/baz[bar] for optional bar support
# and either both app-misc/a and app-misc/b or app-misc/c for alphabet support.
# @CODE
# pkg_postinst() {
# optfeature "foo support" app-misc/foo
# optfeature "bar support" app-misc/bar app-misc/baz[bar]
# optfeature "alphabet support" "app-misc/a app-misc/b" app-misc/c
# }
# @CODE
optfeature() {
debug-print-function ${FUNCNAME} "$@"
local i j msg
local -a arr
local desc=$1
local flag=0
shift
for i; do
read -r -d '' -a arr <<<"${i}"
for j in "${arr[@]}"; do
if has_version "${j}"; then
flag=1
else
flag=0
break
fi
done
if [[ ${flag} -eq 1 ]]; then
break
fi
done
if [[ ${flag} -eq 0 ]]; then
if [[ ${_OPTFEATURE_DOHEADER} == true ]]; then
elog ${_OPTFEATURE_HEADER:-${_OPTFEATURE_DEFAULT_HEADER}}
_OPTFEATURE_DOHEADER=false
fi
for i; do
read -r -d '' -a arr <<<"${i}"
msg=" "
for j in "${arr[@]}"; do
msg+=" ${j} and"
done
msg="${msg:0: -4} for ${desc}"
elog "${msg}"
done
fi
}
fi
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