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#! /usr/bin/python3
#
# select-session.py
# Copyright (C) 2010 Canonical Ltd.
# Copyright (C) 2012-2014 Dustin Kirkland <[email protected]>
#
# Authors: Dustin Kirkland <[email protected]>
# Ryan C. Thompson <[email protected]>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, version 3 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import os
import re
import sys
import subprocess
try:
# For Python3, try and import input from builtins
from builtins import input
except Exception:
# But fall back to using the default input
True
PKG = "byobu"
SHELL = os.getenv("SHELL", "/bin/bash")
HOME = os.getenv("HOME")
BYOBU_CONFIG_DIR = os.getenv("BYOBU_CONFIG_DIR", HOME + "/.byobu")
BYOBU_BACKEND = os.getenv("BYOBU_BACKEND", "tmux")
choice = -1
sessions = []
text = []
reuse_sessions = os.path.exists("%s/.reuse-session" % (BYOBU_CONFIG_DIR))
BYOBU_UPDATE_ENVVARS = ["DISPLAY", "DBUS_SESSION_BUS_ADDRESS", "SESSION_MANAGER", "GPG_AGENT_INFO", "XDG_SESSION_COOKIE", "XDG_SESSION_PATH", "GNOME_KEYRING_CONTROL", "GNOME_KEYRING_PID", "GPG_AGENT_INFO", "SSH_ASKPASS", "SSH_AUTH_SOCK", "SSH_AGENT_PID", "WINDOWID", "UPSTART_JOB", "UPSTART_EVENTS", "UPSTART_SESSION", "UPSTART_INSTANCE"]
def get_sessions():
sessions = []
i = 0
output = False
if BYOBU_BACKEND == "screen":
try:
output = subprocess.Popen(["screen", "-ls"], stdout=subprocess.PIPE).communicate()[0]
except subprocess.CalledProcessError as cpe:
# screen -ls seems to always return 1
if cpe.returncode != 1:
raise
else:
output = cpe.output
if sys.stdout.encoding is None:
output = output.decode("UTF-8")
else:
output = output.decode(sys.stdout.encoding)
if output:
for s in output.splitlines():
s = re.sub(r'\s+', ' ', s)
# Ignore hidden sessions (named sessions that start with a "." or a "_")
if s and s != " " and (s.find(" ") == 0 and len(s) > 1 and s.count("..") == 0 and s.count("._") == 0):
text.append("screen: %s" % s.strip())
items = s.split(" ")
sessions.append("screen____%s" % items[1])
i += 1
if BYOBU_BACKEND == "tmux":
output = subprocess.Popen(["tmux", "list-sessions"], stdout=subprocess.PIPE).communicate()[0]
if sys.stdout.encoding is None:
output = output.decode("UTF-8")
else:
output = output.decode(sys.stdout.encoding)
if output:
for s in output.splitlines():
# Ignore hidden sessions (named sessions that start with a "_")
if s and not s.startswith("_") and s.find("-") == -1:
text.append("tmux: %s" % s.strip())
sessions.append("tmux____%s" % s.split(":")[0])
i += 1
return sessions
def cull_zombies(session_name):
# When using tmux session groups, closing a client will leave
# unattached "zombie" sessions that will never be reattached.
# Search for and kill any unattached hidden sessions in the same group
if BYOBU_BACKEND == "tmux":
output = subprocess.Popen(["tmux", "list-sessions"], stdout=subprocess.PIPE).communicate()[0]
if sys.stdout.encoding is None:
output = output.decode("UTF-8")
else:
output = output.decode(sys.stdout.encoding)
if not output:
return
# Find the master session to extract the group name. We use
# the group number to be extra sure the right session is getting
# killed. We don't want to accidentally kill the wrong one
pattern = "^%s:.+\\((group [^\\)]+)\\).*$" % session_name
master = re.search(pattern, output, re.MULTILINE)
if not master:
return
# Kill all the matching hidden & unattached sessions
pattern = "^_%s-\\d+:.+\\(%s\\)$" % (session_name, master.group(1))
for s in re.findall(pattern, output, re.MULTILINE):
subprocess.Popen(["tmux", "kill-session", "-t", s.split(":")[0]])
def update_environment(session):
backend, session_name = session.split("____", 2)
for var in BYOBU_UPDATE_ENVVARS:
value = os.getenv(var)
if value:
if backend == "tmux":
cmd = ["tmux", "setenv", "-t", session_name, var, value]
else:
cmd = ["screen", "-S", session_name, "-X", "setenv", var, value]
subprocess.call(cmd, stdout=open(os.devnull, "w"))
def attach_session(session):
update_environment(session)
backend, session_name = session.split("____", 2)
cull_zombies(session_name)
# must use the binary, not the wrapper!
if backend == "tmux":
if reuse_sessions:
os.execvp("tmux", ["tmux", "-u", "new-session", "-t", session_name, ";", "set-option", "destroy-unattached"])
else:
os.execvp("tmux", ["tmux", "-u", "attach", "-t", session_name])
else:
os.execvp("screen", ["screen", "-AOxRR", session_name])
sessions = get_sessions()
show_shell = os.path.exists("%s/.always-select" % (BYOBU_CONFIG_DIR))
if len(sessions) > 1 or show_shell:
sessions.append("NEW")
text.append("Create a new Byobu session (%s)" % BYOBU_BACKEND)
sessions.append("SHELL")
text.append("Run a shell without Byobu (%s)" % SHELL)
if len(sessions) > 1:
sys.stdout.write("\nByobu sessions...\n\n")
tries = 0
while tries < 3:
i = 1
for s in text:
sys.stdout.write(" %d. %s\n" % (i, s))
i += 1
try:
try:
user_input = input("\nChoose 1-%d [1]: " % (i - 1))
except Exception:
user_input = ""
if not user_input or user_input == "":
choice = 1
break
try:
choice = int(user_input)
except Exception:
choice = int(eval(user_input))
if choice >= 1 and choice < i:
break
else:
tries += 1
choice = -1
sys.stderr.write("\nERROR: Invalid input\n")
except KeyboardInterrupt:
sys.stdout.write("\n")
sys.exit(0)
except Exception:
if choice == "" or choice == -1:
choice = 1
break
tries += 1
choice = -1
sys.stderr.write("\nERROR: Invalid input\n")
elif len(sessions) == 1:
# Auto-select the only session
choice = 1
if choice >= 1:
if sessions[choice - 1] == "NEW":
# Create a new session
if BYOBU_BACKEND == "tmux":
os.execvp("byobu", ["byobu", "new-session", SHELL])
else:
os.execvp("byobu", ["byobu", SHELL])
elif sessions[choice - 1] == "SHELL":
os.execvp(SHELL, [SHELL])
else:
# Attach to the chosen session; must use the binary, not the wrapper!
attach_session(sessions[choice - 1])
# No valid selection, default to the youngest session, create if necessary
if BYOBU_BACKEND == "tmux":
os.execvp("tmux", ["tmux"])
else:
os.execvp("screen", ["screen", "-AOxRR"])
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