[gentoo-dev] [PATCH] optfeature.eclass: Introduce optfeature header

[Andreas Sturmlechner <asturm@gentoo.org>]

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Before this change, optfeature() will print a list of optional dependencies,
or nothing if deps are installed. Ebuilds commonly print their own elog
ahead of optfeature, which then may not be followed up by any list at all.

This change adds a default header text, which may be changed by the ebuild,
that is only printed if optfeature is about to list at least one dependency.

Signed-off-by: Andreas Sturmlechner <asturm@gentoo.org>
---
 eclass/optfeature.eclass | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/eclass/optfeature.eclass b/eclass/optfeature.eclass
index e13fc3eba81..46f8012b2c3 100644
--- a/eclass/optfeature.eclass
+++ b/eclass/optfeature.eclass
@@ -1,4 +1,4 @@
-# Copyright 1999-2020 Gentoo Authors
+# Copyright 1999-2021 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 # @ECLASS: optfeature.eclass
@@ -14,6 +14,18 @@ esac
 if [[ -z ${_OPTFEATURE_ECLASS} ]]; then
 _OPTFEATURE_ECLASS=1
 
+# @ECLASS-VARIABLE: OPTFEATURE_HEADER
+# @DESCRIPTION:
+# Overridable default header printed ahead of the first optfeature output.
+# Will remain silent if all optional dependencies are present.
+: ${OPTFEATURE_HEADER:="Install additional packages for optional runtime features:"}
+
+# @ECLASS-VARIABLE: _OPTFEATURE_DOHEADER
+# @INTERNAL
+# @DESCRIPTION:
+# If true, print header ahead of the first optfeature output.
+_OPTFEATURE_DOHEADER=true
+
 # @FUNCTION: optfeature
 # @USAGE: <short description> <package atom to match> [other atoms]
 # @DESCRIPTION:
@@ -51,6 +63,10 @@ optfeature() {
 		fi
 	done
 	if [[ ${flag} -eq 0 ]]; then
+		if [[ ${_OPTFEATURE_DOHEADER} == true ]]; then
+			elog ${OPTFEATURE_HEADER}
+			_OPTFEATURE_DOHEADER=false
+		fi
 		for i; do
 			read -r -d '' -a arr <<<"${i}"
 			msg=" "
-- 
2.31.1


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