bash debugger Code

# -*- shell-script -*-
#   Copyright (C) 2008, 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.

# Command aliases are stored here.
typeset -A _Dbg_aliases

# Add an new alias in the alias table
_Dbg_alias_add() {
    (( $# != 2 )) && return 1
    _Dbg_aliases[$1]="$2"
    return 0
}

# Remove alias $1 from our list of command aliases.
_Dbg_alias_remove() {
    (( $# != 1 )) && return 1
    unset "_Dbg_aliases[$1]"
    return 0
}

# Expand alias $1. The result is set in variable expanded_alias which
# could be declared local in the caller.
_Dbg_alias_expand() {
    (( $# != 1 )) && return 1
    expanded_alias="$1"
    [[ -z "$1" ]] && return 0
    [[ -n ${_Dbg_aliases[$1]} ]] && expanded_alias=${_Dbg_aliases[$1]}
    return 0
}

# Echo the index in _Dbg_command_names if found. Return
# 0 if found and 1 if not there.
_Dbg_alias_find_index() {
    typeset find_name=$1
    typeset -i i
    for ((i=0; i <= _Dbg_alias_max_index; i++)) ; do
	[[ ${_Dbg_alias_names[i]} == "$find_name" ]] && echo $i && return 0
    done
    return 1
}

# Return in help_aliases an array of strings that are aliases
# of $1
_Dbg_alias_find_aliased() {
    (($# != 1)) &&  return 255
    typeset find_name=$1
    aliases_found=''
    typeset -i i
    for alias in ${!_Dbg_aliases[@]} ; do
	if [[ ${_Dbg_aliases[$alias]} == "$find_name" ]] ; then 
	    [[ -n $aliases_found ]] && aliases_found+=', '
	    aliases_found+="$alias"
	fi
    done
    return 0
}