"""SCons.Tool.gs

Tool-specific initialization for Ghostscript.

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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__revision__ = "src/engine/SCons/Tool/gs.py  2013/03/03 09:48:35 garyo"

import SCons.Action
import SCons.Platform
import SCons.Util

# Ghostscript goes by different names on different platforms...
platform = SCons.Platform.platform_default()

if platform == 'os2':
    gs = 'gsos2'
elif platform == 'win32':
    gs = 'gswin32c'
else:
    gs = 'gs'

GhostscriptAction = None

def generate(env):
    """Add Builders and construction variables for Ghostscript to an
    Environment."""

    global GhostscriptAction
    if GhostscriptAction is None:
        GhostscriptAction = SCons.Action.Action('$GSCOM', '$GSCOMSTR')

    import pdf
    pdf.generate(env)

    bld = env['BUILDERS']['PDF']
    bld.add_action('.ps', GhostscriptAction)

    env['GS']      = gs
    env['GSFLAGS'] = SCons.Util.CLVar('-dNOPAUSE -dBATCH -sDEVICE=pdfwrite')
    env['GSCOM']   = '$GS $GSFLAGS -sOutputFile=$TARGET $SOURCES'


def exists(env):
    if 'PS2PDF' in env:
        return env.Detect(env['PS2PDF'])
    else:
        return env.Detect(gs) or SCons.Util.WhereIs(gs)

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