# -*- shell-script -*-
# "Examine" debugger command.
#
#   Copyright (C) 2008, 2010-2011, 2016, 2019
#   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.

if [[ 0 == ${#funcfiletrace[@]} ]] ; then
    dirname=${0%/*}
    [[ $dirname == $0 ]] && top_dir='..' || top_dir=${dirname}/..
    for lib_file in help alias ; do source $top_dir/lib/${lib_file}.sh; done
fi

_Dbg_help_add 'examine' \
'**examine** *expr*

Print value of an expression via `typeset`, `let`, and failing these, `eval`.

Single variables and arithmetic expressions do not need leading $ for
their value is to be substituted. However if neither these, variables
need $ to have their value substituted.

In contrast to normal zsh expressions, expressions should not have
blanks which would cause zsh to see them as different tokens.

Examples:
---------

    examine x+1   # ok
    examine x + 1 # not ok

See also:
---------

**eval**.'

function _Dbg_do_examine {
  typeset _Dbg_expr; _Dbg_expr=${@:-"$_Dbg_last_x_args"}
  typeset _Dbg_result
  if [[ -z $_Dbg_expr ]] then
      _Dbg_msg "$_Dbg_expr"
  elif _Dbg_defined $_Dbg_expr ; then
    _Dbg_result=$(typeset -p $_Dbg_expr)
    _Dbg_msg "$_Dbg_result"
  elif _Dbg_is_function "$_Dbg_expr" $_Dbg_set_debug; then
    _Dbg_result=$(typeset -f $_Dbg_expr)
    _Dbg_msg "$_Dbg_result"
  else
    typeset -i _Dbg_rc
    . ${_Dbg_libdir}/lib/set-d-vars.sh
    eval let _Dbg_result=$_Dbg_expr 2>/dev/null; _Dbg_rc=$?
    _Dbg_set_debugger_internal
    if (( _Dbg_rc != 0 )) ; then
        _Dbg_do_print "$_Dbg_expr"
    else
        _Dbg_msg "$_Dbg_result"
    fi
  fi
  _Dbg_last_x_args="$_Dbg_x_args"
}

_Dbg_alias_add 'x' 'examine'

# Demo it.
if [[ 0 == ${#funcfiletrace[@]} ]] ; then
    for _Dbg_file in fns msg ; do
	source $top_dir/lib/${_Dbg_file}.sh
    done
    source $top_dir/command/help.sh
    _Dbg_args='examine'
    _Dbg_do_help x
    _Dbg_do_examine top_dir
fi
