39 lines
1.2 KiB
Python
39 lines
1.2 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, block_walkers
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log = logging.getLogger(__name__)
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codes_to_skip = {
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b'ID', b'WM', b'SN', # These blocks never have external assets.
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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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log.info('Tracing %s', bfilepath)
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with blendfile.BlendFile(bfilepath) as bfile:
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for block in asset_holding_blocks(bfile):
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yield from block_walkers.from_block(block)
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# TODO: handle library blocks for recursion.
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def asset_holding_blocks(bfile: blendfile.BlendFile) -> typing.Iterator[blendfile.BlendFileBlock]:
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"""Generator, yield data blocks that could reference external assets."""
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for block in bfile.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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