#
# Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
# Use is subject to license terms.
#

#
# This file is sourced by interactive ksh93 shells before ${HOME}/.kshrc
#

# Enable "gmacs" editor mode if the user did not set an
# input mode yet (for example via ${EDITOR}, ${VISUAL} or any
# "set -o" flag)
if [[ "$(set +o)" != ~(Er)--(gmacs|emacs|vi)( .*|) ]] ; then
	set -o gmacs
fi
# max. number of path components shown on the default prompt
if [[ -z ${.sh.path_comps} ]]; then
	integer .sh.path_comps=3
else
	# is a [reasonable] number?
	integer x=${.sh.path_comps}
	(( $x < 1 )) && integer .sh.path_comps=3
	unset x
fi
	
# enable multiline input mode
set -o multiline
# enable globstar mode (match subdirs with **/)
set -o globstar

# Set a default prompt (<username>@<hostname> <path> <"($|#) ">) if
# then variable does not exist in the environment.
#
# Algorithm:
# 1. Define "ellipsis", either Unicode #2026 for unicode locales
# and "..." otherwise
# ([[ "${LC_ALL}/${LANG}" = ~(Elr)(.*UTF-8/.*|/.*UTF-8) ]]
# ensures that the pattern matches the leftmost sequence
# containing *.UTF-8, allowing to match either LC_ALL or
# LANG when LC_ALL is not set)
# 2. If PWD is within HOME replace value of HOME with '~'
# If the PWD is longer than 30 charatcers shorten it to 30 chars
# print '#' for user "root" and '$' for normal users
# Notes:
# - printf "%*s\r%s" COLUMNS "") # is used at the beginning to
#   work around a bug in the "multiline" handling code which
#   causes the shell to override its own prompt when the edit
#   line overflows (this happens if the terminal cursor
#   position is not 0 when PS1 is printed).
# - PS1 will initially be empty until either...
#   a) ... someone sets the variable
#       or
#   b) ... the prompt is displayed for the first time (default is
#     '$ ' for normal users and '# ' for user "root")
# - The statement below will not work if someone sources /etc/ksh.kshrc
#   unless PS1 gets "unset" first.
# - Make sure to use absolute paths (e.g. /usr/bin/hostname) to make
#   sure PS1 works in cases where PATH does not contain /usr/bin/
# jel:
#	- always enable multiline and globstar
#   - removed the match expression bullshit, since it has undesired 
#	  side-effects on interactive shell (changes ${.sh.match} -> unusable)
#   - print only last 3 components excl. a possible ~ of a path prefixed by
#	  ${.sh.ellipses} if set (e.g. to '\u[2026]')
#	  NOTE: the a < b || a > b is needed instead of a != b to avoid pattern
#	  matching and thus possible change of .sh.match
if [[ "$(set)" != ~(E)PS1= && -z ${PS1} ]] ; then
	PS1=${ printf "\033[1m${LOGNAME}@${ uname -n ; } " ; }'$(
		set +o xtrace +o errexit
		p="${PWD}"
		p1="${p:0:${#HOME}}"
		integer n=${.sh.path_comps}
		[[ ${p1} < ${HOME} || ${p1} > ${HOME} ]] && : || p="~${p:${#HOME}}"
		IFS="/" c=( ${p} )
		l=${#c[@]}
		[[ ${p:0:1} == "~" ]] && (( l-1 == n )) && (( n++ ))
		if (( l > n )); then
			[[ -n ${.sh.ellipses} ]] && p="${.sh.ellipses}/" || p=""
			for (( i=l-n ; i < l ; i++ )) ; do
				p+="${c[$i]}/"
			done
			p=${p:0:${#p}-1}
		fi
		[[ "${LOGNAME}" == "root" ]] && p+=" # " || p+=" \$ "
		printf "${p}\033[0m"
	)'
fi