# .bashrc
# 2009-06-17
# bpkroth
#
# This is a stripped down copy of my current .bashrc file for the purposes of
# showing how I use bash, preexec, and screen to display more meaningful
# information in ssh sessions.  My usual set of rc files is used in several
# different environments so a few of the extra bits of error checking and
# strange syntax are left in here.  And yes all of these comments usually exist
# because I expect myself to forget what things are for otherwise.

# exit if this is not an interactive shell
if [ -z "$PS1" ]; then
        return
fi

function bin_in_path { 
	local out=""
	if ! out=`which $1 2>&1` || echo "$out" | egrep "^no $1 in " > /dev/null; then 
		return 1
	else 
		return 0
	fi
}

# Turn the screen session name into something a little bit easier to read.
# This will be used by .bash.preexec later.
case $TERM in
	screen*)
		if [ -z "$LC_MYSTY" ] && [ -n "$STY" ]; then
			export LC_MYSTY=`echo $STY | awk -F. '( NF == 2 ) { print $2 } ( NF == 3 ) { print $2 FS $3 }'`
		fi
		;;
esac

# Some tweaks for su/sudo customization
export MYUSER=bpkroth
if [ $EUID == 0 ]; then
	export MYCONFDIR=~bpkroth
	export PATH=/root/bin:$PATH
	unset DISPLAY
	umask 0022
else
	export MYCONFDIR=~bpkroth
	export USERNAME=$USER
	umask 0026

	# Auto launch screen on SSH connections
	# Sometimes a pain to deal with SSH screen sessions.
	# Can be done with C-a a* though.
	# Also a good idea to always use a hardstatus or caption line in .screenrc
	if ! [[ $TERM == screen* ]] && bin_in_path screen; then
		if [ -n "$SSH_TTY" ]; then
			# This is a remote session.
			# Connect to the singular screen instance if it is
			# available, else list if there are multiple, else
			# start a new one.
			N=`screen -list | grep -c '[0-9].*tached'`
			if [ $N == 1 ]; then
				sleep .5 && screen -X windowlist -b &
				#exec screen -x -p -
				screen -x -p -
			elif [ $N == 0 ]; then
				#exec screen
				screen
			else
				echo
				screen -list
			fi
		#else # local connection, don't open a screen session by default
		#	screen
		fi
	fi
fi

MYTTY=`tty 2>&1`

# Force use of my screenrc file, even if I'm being lazy and "sudo screen".
export SCREENRC=$MYCONFDIR/.screenrc

# Add a timestamp to history records.
export HISTTIMEFORMAT='%Y-%m-%d %H:%M:%S:: '

# Install ZSH style precmd() and preexec() functions.
# Useful for setting the title of the terminal to the command that's
# running, not just which directory in.  This make distinguishing
# screen sessions much easier as well.
if echo "$MYTTY" | grep '/dev/pts' > /dev/null || echo "$MYTTY" | grep '/dev/tty' > /dev/null; then
	if [ -f $MYCONFDIR/.bash.preexec ]; then
		# Note:	This requires NOT using DEBUG or PROMPT_COMMAND.  It
		# 	should also be the last thing we do in the bashrc.

		unset PROMPT_COMMAND
		
		# The script works better if these variables are set.
		# http://glyf.livejournal.com/63106.html?thread=210818
		export SCREEN_HOST=$HOSTNAME

		# If this is a local connection, also try to set some env
		# variables that may or may not be transferred to other hosts.
		# See also: 
		# man sshd_config 	AcceptEnv
		# man ssh_config	SendEnv
		if [ -z "$SSH_TTY" ]; then
			[ -z "$LC_HOST" ] && export LC_HOST=$HOSTNAME
			[ -z "$LC_USER" ] && export LC_USER=$USER
		fi

		if [ $EUID == 0 ]; then
			export PROMPTCHAR='#'
		else
			export PROMPTCHAR='$'
		fi

		. $MYCONFDIR/.bash.preexec

		# The built in functions script pretty much do what I want them to.
		# I just tweaked the format a little.
		preexec_xterm_title_install
	fi
fi

# Some environment cleanup
unset MYTTY