50 lines
1.5 KiB
Python
50 lines
1.5 KiB
Python
import logging
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import pathlib
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import typing
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from blender_asset_tracer import blendfile
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from . import result, blocks2assets, file2blocks
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log = logging.getLogger(__name__)
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codes_to_skip = {
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# These blocks never have external assets:
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b'ID', b'WM', b'SN',
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# These blocks are skipped for now, until we have proof they point to
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# assets otherwise missed:
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b'GR', b'WO', b'BR', b'LS',
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}
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def deps(bfilepath: pathlib.Path) -> typing.Iterator[result.BlockUsage]:
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"""Open the blend file and report its dependencies.
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:param bfilepath: File to open.
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"""
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log.info('opening: %s', bfilepath)
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bfile = blendfile.open_cached(bfilepath)
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# Sort the asset-holding blocks so that we can iterate over them
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# in disk order, which is slightly faster than random order.
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ahb = asset_holding_blocks(file2blocks.iter_blocks(bfile))
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for block in sorted(ahb):
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yield from blocks2assets.iter_assets(block)
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def asset_holding_blocks(blocks: typing.Iterable[blendfile.BlendFileBlock]) \
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-> typing.Iterator[blendfile.BlendFileBlock]:
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"""Generator, yield data blocks that could reference external assets."""
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for block in blocks:
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assert isinstance(block, blendfile.BlendFileBlock)
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code = block.code
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# The longer codes are either arbitrary data or data blocks that
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# don't refer to external assets. The former data blocks will be
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# visited when we hit the two-letter datablocks that use them.
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if len(code) > 2 or code in codes_to_skip:
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continue
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yield block
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