mirror of
https://github.com/bazel-contrib/rules_foreign_cc
synced 2024-11-27 02:43:28 +00:00
42 lines
1.1 KiB
Python
42 lines
1.1 KiB
Python
def detect_root(source):
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"""Detects the path to the topmost directory of the 'source' outputs.
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To be used with external build systems to point to the source code/tools directories.
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"""
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root = ""
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sources = source.files.to_list()
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if (root and len(root) > 0) or len(sources) == 0:
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return root
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root = ""
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level = -1
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num_at_level = 0
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# find topmost directory
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for file in sources:
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file_level = _get_level(file.path)
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if level == -1 or level > file_level:
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root = file.path
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level = file_level
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num_at_level = 1
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elif level == file_level:
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num_at_level += 1
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if num_at_level == 1:
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return root
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(before, sep, after) = root.rpartition("/")
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if before and sep and after:
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return before
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return root
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def _get_level(path):
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normalized = path
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for i in range(len(path)):
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new_normalized = normalized.replace("//", "/")
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if len(new_normalized) == len(normalized):
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break
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normalized = new_normalized
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return normalized.count("/")
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