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+# Copyright 1999-2007 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+# $Header: $
+
+#
+# Original Author: root
+# Purpose: To handle the postgresql selection related tasks.
+#
+
+inherit versionator
+ECLASS="postgresql"
+INHERITED="$INHERITED $ECLASS"
+
+# Usage: postgresql_version_in_range [version[ min_version[ max_version]]]
+# Returns $?=0 if in range
+postgresql_version_in_range() {
+	local v="$1" min="$2" max="$3"
+	if [[ ! -z "$min" ]] ; then
+		version_compare "$min" "$v"
+		[[ "$?" = "3" ]] && return 1
+	fi
+	if [[ ! -z "$max" ]] ; then
+		version_compare "$max" "$v"
+		[[ "$?" = "1" ]] && return 2
+	fi
+	return 0
+}
+
+# Usage: postgresql_get_versions_range [ min_version[ max_version]]
+postgresql_get_versions_range() {
+	local min="$1" max="$2"
+	for s in /usr/lib/eselect-postgresql/slots/* ; do
+		[[ -d "$s" ]] || continue
+		local v="$(basename $s)"
+		postgresql_version_in_range "$v" "$min" "$max" || continue
+		echo "$v"
+	done
+}
+# Usage: postgresql_get_sorted_versions [ min_version[ max_version]]
+postgresql_get_sorted_versions() {
+	version_sort $(postgresql_get_versions_range "$1" "$2")
+}
+
+# Usage: postgresql_find_version [min_version[ max_version[ strategy]]]
+#	min_version - minimum supported version (empty string if any)
+#	max_version - maximum supported version (empty string if any)
+#	strategy	- best, worst (that is, if eselected version isn't in range)
+#				  (best is default)
+# Returns selected version string
+postgresql_find_version() {
+	local min="$1" max="$2" strategy="$3"
+	local eselected="$(eselect postgresql show)"
+	if [[ "$eselected" != "(none)" ]] ; then
+		postgresql_version_in_range "$eselected" "$min" "$max" && { echo "$eselected" ; return 0; }
+	fi
+	local vers=( $(postgresql_get_sorted_versions "$min" "$max") )
+	case "$strategy" in
+		worst)
+			echo "${vers[0]}"
+			;;
+		*)
+			echo "${vers[${#vers[@]}-1]}"
+			;;
+	esac
+}
+
+# Usage: postgresql_get_bindir [min_version[ max_version[ strategy]]]
+#	See postgresql_find_version
+# Returns path to binaries
+postgresql_get_bindir() {
+	local ver="$(postgresql_find_version "$1" "$2" "$3")"
+	(. /usr/lib/eselect-postgresql/slots/$ver/libs ; echo $postgres_bindir )
+}
+
+# Usage: postgresql_get_pgconfig [min_version[ max_version[ strategy]]]
+#	See postgresql_find_version
+# Returns path to pg_config
+postgresql_get_pgconfig() {
+	echo "$(postgresql_get_bindir "$1" "$2" "$3")/pg_config"
+}
+
+# Usage: postgresql_get_bindir_for_slot slot
+# Returns path to binaries for exact slot
+postgresql_get_bindir_for_slot() {
+	(. /usr/lib/eselect-postgresql/slots/$1/libs ; echo $postgres_bindir)
+}
+# Usage: postgresql_get_pgconfig_for_slot slot
+# Returns path to pg_config for exact slot
+postgresql_get_pgconfig_for_slot() {
+	echo "$(. /usr/lib/eselect-postgresql/slots/$1/libs ; echo $postgres_bindir)/pg_config"
+}