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diff --git a/eclass/shell-completion.eclass b/eclass/shell-completion.eclass
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+# Copyright 2023 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+# @ECLASS: shell-completion.eclass
+# @SUPPORTED_EAPIS: 8
+# @PROVIDES: bash-completion-r1
+# @AUTHOR:
+# Alfred Wingate <parona@protonmail.com>
+# @MAINTAINER:
+# Jonas Frei <freijon@pm.me>
+# Florian Schmaus <flow@gentoo.org>
+# @BLURB: a few quick functions to install various shell completion files
+# @DESCRIPTION:
+# This eclass provides a standardised way to install shell completions
+# for popular shells.  It inherits the already widely adopted
+# 'bash-completion-r1', thus extending on its functionality.
+
+case ${EAPI} in
+	8) ;;
+	*) die "${ECLASS}: EAPI ${EAPI:-0} not supported"
+esac
+
+if [[ ! ${_SHELL_COMPLETION_ECLASS} ]]; then
+_SHELL_COMPLETION_ECLASS=1
+
+# Extend bash-completion-r1
+inherit bash-completion-r1
+
+# @FUNCTION: _shell-completion_get_fishcompdir
+# @INTERNAL
+# @RETURN: unprefixed fish completions directory
+_shell-completion_get_fishcompdir() {
+	echo "/usr/share/fish/vendor_completions.d"
+}
+
+# @FUNCTION: _shell-completion_get_zshcompdir
+# @INTERNAL
+# @RETURN: unprefixed zsh completions directory
+_shell-completion_get_zshcompdir() {
+	echo "/usr/share/zsh/site-functions"
+}
+
+# @FUNCTION: get_fishcompdir
+# @RETURN: the fish completions directory (with EPREFIX)
+get_fishcompdir() {
+	debug-print-function ${FUNCNAME} "${@}"
+
+	echo "${EPREFIX}$(_shell-completion_get_fishcompdir)"
+}
+
+# @FUNCTION: get_zshcompdir
+# @RETURN: the zsh completions directory (with EPREFIX)
+get_zshcompdir() {
+	debug-print-function ${FUNCNAME} "${@}"
+
+	echo "${EPREFIX}$(_shell-completion_get_zshcompdir)"
+}
+
+# @FUNCTION: dofishcomp
+# @USAGE: <file...>
+# @DESCRIPTION:
+# Install fish completion files passed as args.
+dofishcomp() {
+	debug-print-function ${FUNCNAME} "${@}"
+
+	(
+		insopts -m 0644
+		insinto "$(_shell-completion_get_fishcompdir)"
+		doins "${@}"
+	)
+}
+
+# @FUNCTION: dozshcomp
+# @USAGE: <file...>
+# @DESCRIPTION:
+# Install zsh completion files passed as args.
+dozshcomp() {
+	debug-print-function ${FUNCNAME} "${@}"
+
+	(
+		insopts -m 0644
+		insinto "$(_shell-completion_get_zshcompdir)"
+		doins "${@}"
+	)
+}
+
+# @FUNCTION: newfishcomp
+# @USAGE: <file> <newname>
+# @DESCRIPTION:
+# Install fish file under a new name.
+newfishcomp() {
+	debug-print-function ${FUNCNAME} "${@}"
+
+	(
+		insopts -m 0644
+		insinto "$(_shell-completion_get_fishcompdir)"
+		newins "${@}"
+	)
+}
+
+# @FUNCTION: newzshcomp
+# @USAGE: <file> <newname>
+# @DESCRIPTION:
+# Install zsh file under a new name.
+newzshcomp() {
+	debug-print-function ${FUNCNAME} "${@}"
+
+	(
+		insopts -m 0644
+		insinto "$(_shell-completion_get_zshcompdir)"
+		newins "${@}"
+	)
+}
+
+fi