# -*- shell-script -*-
# display.sh - gdb-like "display" debugger command
#
#   Copyright (C) 2002, 2003, 2006, 2007, 2008, 2009, 2010
#   2011 Rocky Bernstein <rocky@gnu.org>
#
#   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; either version 2, or
#   (at your option) any later version.
#
#   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; see the file COPYING.  If not, write to
#   the Free Software Foundation, 59 Temple Place, Suite 330, Boston,
#   MA 02111 USA.

_Dbg_help_add display \
"display [STMT]

Evalute STMT each time the debugger is stopped. If STMT is omitted, evaluate
all of the display statements that are active. In contrast, 'info display'
shows the display statements without evaluating them.

Examples:
  display echo \$x  # show the current value of x each time debugger stops
  display          # evaluate all display statements

See also 'undisplay' and 'info display'."

# Set display command or list all current display expressions
_Dbg_do_display() {
  if (( 0 == $# )); then
    _Dbg_eval_all_display
  else
    typeset -i n=_Dbg_disp_max++
    _Dbg_disp_exp[$n]="$@"
    _Dbg_disp_enable[$n]=1
    _Dbg_printf '%2d: %s' $n "${_Dbg_disp_exp[$n]}"
  fi
  return 0
}
