41 lines
1.1 KiB
Python
41 lines
1.1 KiB
Python
"""
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select_file() build rule implementation.
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Selects a single file from the outputs of some target by given relative path.
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"""
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def _impl(ctx):
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if ctx.attr.subpath and len(ctx.attr.subpath) == 0:
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fail("Subpath can not be empty.")
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out = None
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canonical = ctx.attr.subpath.replace("\\", "/")
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for file_ in ctx.attr.srcs.files.to_list():
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if file_.path.replace("\\", "/").endswith(canonical):
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out = file_
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break
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if not out:
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files_str = ",\n".join([
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str(f.path)
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for f in ctx.attr.srcs.files.to_list()
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])
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fail("Can not find specified file in [%s]" % files_str)
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return [DefaultInfo(files = depset([out]))]
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select_file = rule(
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implementation = _impl,
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doc = "Selects a single file from the outputs of some target \
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by given relative path",
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attrs = {
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"srcs": attr.label(
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allow_files = True,
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mandatory = True,
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doc = "The target producing the file among other outputs",
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),
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"subpath": attr.string(
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mandatory = True,
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doc = "Relative path to the file",
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),
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},
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)
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