eclass/readme.gentoo-r1.eclass: introduce this revision for adding eapi6 support and explain the people the changes regarding it stopping to export phase functions (#520094#c6)

eclass/readme.gentoo-r1.eclass

@@ -0,0 +1,110 @@
+# Copyright 1999-2015 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+# $Id$
+
+# @ECLASS: readme.gentoo.eclass
+# @MAINTAINER:
+# Pacho Ramos <pacho@gentoo.org>
+# @AUTHOR:
+# Author: Pacho Ramos <pacho@gentoo.org>
+# @BLURB: An eclass for installing a README.gentoo doc file recording tips
+# shown via elog messages.
+# @DESCRIPTION:
+# An eclass for installing a README.gentoo doc file recording tips
+# shown via elog messages. With this eclass, those elog messages will only be
+# shown at first package installation and a file for later reviewing will be
+# installed under /usr/share/doc/${PF}
+#
+# You need to call readme.gentoo_create_doc in src_install phase and
+# readme.gentoo_print_elog in pkg_postinst
+
+if [[ -z ${_README_GENTOO_ECLASS} ]]; then
+_README_GENTOO_ECLASS=1
+
+inherit eutils
+
+case "${EAPI:-0}" in
+	0|1|2|3|4|5)
+		die "Unsupported EAPI=${EAPI:-0} (too old) for ${ECLASS}"
+		;;
+	6)
+		;;
+	*)
+		die "Unsupported EAPI=${EAPI} (unknown) for ${ECLASS}"
+		;;
+esac
+
+# @ECLASS-VARIABLE: DISABLE_AUTOFORMATTING
+# @DEFAULT_UNSET
+# @DESCRIPTION:
+# If non-empty, DOC_CONTENTS information will be strictly respected,
+# not getting it automatically formatted by fmt. If empty, it will
+# rely on fmt for formatting and 'echo -e' options to tweak lines a bit.
+
+# @ECLASS-VARIABLE: FORCE_PRINT_ELOG
+# @DEFAULT_UNSET
+# @DESCRIPTION:
+# If non-empty this variable forces elog messages to be printed.
+
+# @ECLASS-VARIABLE: README_GENTOO_SUFFIX
+# @DESCRIPTION:
+# If you want to specify a suffix for README.gentoo file please export it.
+: ${README_GENTOO_SUFFIX:=""}
+
+# @FUNCTION: readme.gentoo_create_doc
+# @DESCRIPTION:
+# Create doc file with ${DOC_CONTENTS} variable (preferred) and, if not set,
+# look for "${FILESDIR}/README.gentoo" contents. You can use
+# ${FILESDIR}/README.gentoo-${SLOT} also.
+# Usually called at src_install phase.
+readme.gentoo_create_doc() {
+	debug-print-function ${FUNCNAME} "${@}"
+
+	if [[ -n "${DOC_CONTENTS}" ]]; then
+		eshopts_push
+		set -f
+		if [[ -n "${DISABLE_AUTOFORMATTING}" ]]; then
+			echo "${DOC_CONTENTS}" > "${T}"/README.gentoo
+		else
+			echo -e ${DOC_CONTENTS} | fold -s -w 70 \
+				| sed 's/[[:space:]]*$//' > "${T}"/README.gentoo
+		fi
+		eshopts_pop
+	elif [[ -f "${FILESDIR}/README.gentoo-${SLOT%/*}" ]]; then
+		cp "${FILESDIR}/README.gentoo-${SLOT%/*}" "${T}"/README.gentoo || die
+	elif [[ -f "${FILESDIR}/README.gentoo${README_GENTOO_SUFFIX}" ]]; then
+		cp "${FILESDIR}/README.gentoo${README_GENTOO_SUFFIX}" "${T}"/README.gentoo || die
+	else
+		die "You are not specifying README.gentoo contents!"
+	fi
+
+	dodoc "${T}"/README.gentoo
+	README_GENTOO_DOC_VALUE=$(< "${T}/README.gentoo")
+}
+
+# @FUNCTION: readme.gentoo_print_elog
+# @DESCRIPTION:
+# Print elog messages with "${T}"/README.gentoo contents. They will be
+# shown only when package is installed at first time.
+# Usually called at pkg_postinst phase.
+#
+# If you want to show them always, please set FORCE_PRINT_ELOG to a non empty
+# value in your ebuild before this function is called.
+# This can be useful when, for example, DOC_CONTENTS is modified, then, you can
+# rely on specific REPLACING_VERSIONS handling in your ebuild to print messages
+# when people update from versions still providing old message.
+readme.gentoo_print_elog() {
+	debug-print-function ${FUNCNAME} "${@}"
+
+	if [[ -z "${README_GENTOO_DOC_VALUE}" ]]; then
+		die "readme.gentoo_print_elog invoked without matching readme.gentoo_create_doc call!"
+	elif ! [[ -n "${REPLACING_VERSIONS}" ]] || [[ -n "${FORCE_PRINT_ELOG}" ]]; then
+		echo -e "${README_GENTOO_DOC_VALUE}" | while read -r ELINE; do elog "${ELINE}"; done
+		elog ""
+		elog "(Note: Above message is only printed the first time package is"
+		elog "installed. Please look at ${EPREFIX}/usr/share/doc/${PF}/README.gentoo*"
+		elog "for future reference)"
+	fi
+}
+
+fi