initial version of python.eselect

1 files changed, 92 insertions, 0 deletions

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+# Copyright 1999-2005 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+# $Id: $
+
+# Heavily based on profile.eselect.
+
+DESCRIPTION="Manage the /usr/bin/python symlink."
+MAINTAINER="marienz@gentoo.org"
+VERSION="0.1"
+
+
+INTERPRETER_PATH="${ROOT}/usr/bin/"
+
+find_targets() {
+	local interpreter
+	# Think twice before adding jython to this list. /usr/bin/jython
+	# is a bash wrapper that calls java-config, which is a python
+	# script, so you need a valid /usr/bin/python to start jython.
+	for interpreter in "${INTERPRETER_PATH}"python?.? ; do
+		echo ${interpreter#${INTERPRETER_PATH}}
+	done
+}
+
+
+describe_show() {
+	echo "Show the active python interpreter"
+}
+
+do_show() {
+	active=$(canonicalise "${INTERPRETER_PATH}python")
+	echo ${active#${INTERPRETER_PATH}}
+}
+
+
+describe_list() {
+	echo "List installed python interpreters"
+}
+
+do_list() {
+	local targets=( $(find_targets) )
+
+	write_list_start "Available python interpreters:"
+
+	if [[ -n ${targets[@]} ]] ; then
+		# mark the active python
+		local i active=$(do_show)
+		for (( i = 0 ; i < ${#targets[@]} ; i = i + 1 )) ; do
+			[[ ${targets[${i}]} == $active ]] && \
+				targets[${i}]="${targets[${i}]} $(highlight '*' )"
+		done
+		write_numbered_list "${targets[@]}"
+	else
+		write_kv_list_entry "(none found)" ""
+	fi
+}
+
+
+describe_set() {
+	echo "Set active python interpreter."
+}
+
+do_set() {
+	if [[ -z ${1} ]] ; then
+		die -q "You didn't tell me which python interpreter to use"
+	fi
+
+	local targets=( $(find_targets) ) target=${1}
+
+	if is_number "${target}"; then
+		target=${targets[$(( ${target} - 1 ))]}
+	fi
+
+	if ! has ${target} "${targets[@]}" ; then
+		die -q "Invalid target ${target}"
+	fi
+
+	pushd "${INTERPRETER_PATH}" 1>/dev/null
+	ln -nfs ${target} python
+	popd 1>/dev/null
+}
+
+
+describe_update() {
+	echo "Switch to the most recent CPython."
+}
+
+do_update() {
+	local targets=( $(cd "${INTERPRETER_PATH}"; ls python?.?|sort -r) ) target
+	target=${targets[0]}
+	echo "Switching to ${target}"
+	do_set ${target}
+}