dotbash_screen

#!/bin/bash
#
# Alex's .bashrc_screen
#
# Various screen session hacks for bringing up special screens
#

SCREEN_ATT=`screen -ls | grep -c Attached`
SCREEN_DET=`screen -ls | grep -c Detached`
SCREEN_DEAD=`screen -ls | grep -c Dead`

SCREEN_STATUS="$SCREEN_ATT att/$SCREEN_DET det/$SCREEN_DEAD dead"

#
# Environment Hackage
#
# One of the biggest problems with screen is if the environment of
# the GUI session you are running in has changed. Sure screen keeps
# everything running but suddenly you can't spawn stuff that wants
# DBUS connections and the like.
#
#
ENV_DUMP_FILE="${HOME}/current_${HOSTNAME}.env"
alias dump_env="env > ${ENV_DUMP_FILE}"

# If in a GUI dump the current environment
# This is not perfect, if you spawn an xterm out of your screen session it
# vape your carefully stored environment, so don't do that.
if [[ ${TERM} == "screen" || ${TERM} == "screen-256color" ]]; then
    SCREEN_TERM="run restore_gui_env to pick up GUI vars"
elif [[ ${TERM} == "linux" ]]; then
    SCREEN_TERM="in a console session"
else
    SCREEN_TERM="dumping env in ${ENV_DUMP_FILE}"
    dump_env
fi

echo "loading .bash_screen ($SCREEN_STATUS - $SCREEN_TERM)"

# Restore a single environment variable from ${ENV_DUMP_FILE}
function restore_env_var
{
    if [[ "$1"  && -f ${ENV_DUMP_FILE} ]]
    then
	line=`grep $1 ${ENV_DUMP_FILE}`
	if [ "$line" ]; then
	    delim=`expr index $line =`
	    value=${line:$delim}
	    echo "export $1=$value"
	    export $1=$value
	fi
    fi
}

function restore_gui_env
{
    echo "Restoring GUI environment settings"
    restore_env_var DBUS_SESSION_BUS_ADDRESS
    restore_env_var XDG_SESSION_COOKIE
    restore_env_var XAUTHORITY
    restore_env_var DISPLAY
    restore_env_var SSH_AUTH_SOCK
    restore_env_var GPG_AGENT_INFO
    restore_env_var GPG_TTY
    restore_env_var GNOME_KEYRING_SOCKET
}