"""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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# without limitation the rights to use, copy, modify, merge, publish,
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# permit persons to whom the Software is furnished to do so, subject to
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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.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) -> None:
    """Add Builders and construction variables for Ghostscript to an
    Environment."""
    global GhostscriptAction
    # The following try-except block enables us to use the Tool
    # in standalone mode (without the accompanying pdf.py),
    # whenever we need an explicit call of gs via the Gs()
    # Builder ...
    try:
        if GhostscriptAction is None:
            GhostscriptAction = SCons.Action.Action('$GSCOM', '$GSCOMSTR')
    
        from SCons.Tool import pdf
        pdf.generate(env)
    
        bld = env['BUILDERS']['PDF']
        bld.add_action('.ps', GhostscriptAction)
    except ImportError as e:
        pass

    gsbuilder = SCons.Builder.Builder(action = SCons.Action.Action('$GSCOM', '$GSCOMSTR'))
    env['BUILDERS']['Gs'] = gsbuilder
    
    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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