#!/bin/bash

# *** PRELIMINARY NOTE ***
# Due to a bug in dash[*], and as dash can be the /bin/sh implementation,
# /bin/bash is used here everywhere /bin/sh should have been used. If you
# do not have /bin/bash installed, you can replace these occurrences by
# another working shell (zsh is OK).
#
# [*] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=683671
#     i.e. a Ctrl-G in Emacs 24 would make the command fail
#     (killed by SIGINT).

# This script should be used as a replacement for /bin/sh by text programs
# that can run X applications.  Its goal is to update the environment when
# such programs run in a screen session that survives across X sessions.
#
# The "escreen" wrapper needs to be run instead of "screen" when resuming
# a screen session.  This wrapper will create a .screenenv/$STY file with
# the correct values of the environment variables DISPLAY, XAUTHORITY and
# DBUS_SESSION_BUS_ADDRESS.
#
# A bit more may be needed to make this work with various software.
# For instance:
#
#   * Mutt: you should recompile Mutt with the following configure option:
#
#       --with-exec-shell=/path/to/sh.screen
#
#     Then you will be able to run Mutt from screen and run X applications
#     (e.g., compose editor, shell commands, mailcap applications) from it
#     across X sessions.
#
#   * Zsh: add the following two lines to the preexec function:
#
#       local envfile=$HOME/.screenenv/$STY
#       [[ -f $envfile ]] && source $envfile

# Source the file correcting the environment.
if [ -n "$STY" ]; then
  envfile=$HOME/.screenenv/$STY
  [ -f "$envfile" ] && . "$envfile"
fi

# Try to guess what the real shell should be.
if [ -n "$SHSCREEN_SHELL" ]; then
  shell=$SHSCREEN_SHELL
else
  case $0 in
    *sh.screen)
      shell=/bin/bash ;;
    sh)
      shell=/bin/bash ;;
    *)
      shell=$0 ;;
  esac
fi

# Execute the real shell with the unmodified arguments.
exec "$shell" ${@+"$@"}

# $Id: sh.screen 70575 2014-06-22 19:25:20Z vinc17/xvii $