"""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.

"""

#
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# The above copyright notice and this permission notice shall be included
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__revision__ = "__FILE__ __REVISION__ __DATE__ __DEVELOPER__"

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)

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