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# Extended prompt.

# Copyright (C) 2011-2012 Free Software Foundation, Inc.

# 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 3 of the License, 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.  If not, see <http://www.gnu.org/licenses/>.

"""GDB command for working with extended prompts."""

import gdb

import gdb.prompt

class _ExtendedPrompt(gdb.Parameter):

    """Set the extended prompt.

Usage: set extended-prompt VALUE

Substitutions are applied to VALUE to compute the real prompt.

The currently defined substitutions are:

"""

    # Add the prompt library's dynamically generated help to the

    # __doc__ string.

    __doc__ = __doc__ + gdb.prompt.prompt_help()

    set_doc = "Set the extended prompt."

    show_doc = "Show the extended prompt."

    def __init__(self):

        super(_ExtendedPrompt, self).__init__("extended-prompt",

                                              gdb.COMMAND_SUPPORT,

                                              gdb.PARAM_STRING_NOESCAPE)

        self.value = ''

        self.hook_set = False

    def get_show_string (self, pvalue):

        if self.value is not '':

           return "The extended prompt is: " + self.value

        else:

           return "The extended prompt is not set."

    def get_set_string (self):

        if self.hook_set == False:

           gdb.prompt_hook = self.before_prompt_hook

           self.hook_set = True

        return ""

    def before_prompt_hook(self, current):

        if self.value is not '':

            newprompt = gdb.prompt.substitute_prompt(self.value)

            return newprompt.replace('\\', '\\\\')

        else:

            return None

_ExtendedPrompt()