"""SCons.Tool.tar

Tool-specific initialization for tar.

There normally shouldn't be any need to import this module directly.
It will usually be imported through the generic SCons.Tool.Tool()
selection method.

"""

#
# Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007 The SCons Foundation
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# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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__revision__ = "src/engine/SCons/Tool/tar.py 2523 2007/12/12 09:37:41 knight"

import SCons.Action
import SCons.Builder
import SCons.Defaults
import SCons.Node.FS
import SCons.Util

tars = ['tar', 'gtar']

TarAction = SCons.Action.Action('$TARCOM', '$TARCOMSTR')

TarBuilder = SCons.Builder.Builder(action = TarAction,
                                   source_factory = SCons.Node.FS.Entry,
                                   source_scanner = SCons.Defaults.DirScanner,
                                   suffix = '$TARSUFFIX',
                                   multi = 1)


def generate(env):
    """Add Builders and construction variables for tar to an Environment."""
    try:
        bld = env['BUILDERS']['Tar']
    except KeyError:
        bld = TarBuilder
        env['BUILDERS']['Tar'] = bld

    env['TAR']        = env.Detect(tars) or 'gtar'
    env['TARFLAGS']   = SCons.Util.CLVar('-c')
    env['TARCOM']     = '$TAR $TARFLAGS -f $TARGET $SOURCES'
    env['TARSUFFIX']  = '.tar'

def exists(env):
    return env.Detect(tars)