121 lines
4.0 KiB
Python
121 lines
4.0 KiB
Python
"""Path utils built on top of Skylib's path utils"""
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load("@bazel_skylib//lib:paths.bzl", _spaths = "paths")
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def _relative_file(to_file, frm_file):
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"""Resolves a relative path between two files, "to_file" and "frm_file".
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If neither of the paths begin with ../ it is assumed that they share the same root. When finding the relative path,
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the incoming files are treated as actual files (not folders) so the resulting relative path may differ when compared
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to passing the same arguments to python's "os.path.relpath()" or NodeJs's "path.relative()".
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For example, 'relative_file("../foo/foo.txt", "bar/bar.txt")' will return '../../foo/foo.txt'
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Args:
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to_file: the path with file name to resolve to, from frm
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frm_file: the path with file name to resolve from
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Returns:
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The relative path from frm_file to to_file, including the file name
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"""
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to_parent_count = to_file.count("../")
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frm_parent_count = frm_file.count("../")
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parent_count = to_parent_count
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if to_parent_count > 0 and frm_parent_count > 0:
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if frm_parent_count > to_parent_count:
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fail("traversing more parent directories (with '../') for 'frm_file' than 'to_file' requires file layout knowledge")
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parent_count = to_parent_count - frm_parent_count
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to_segments = _spaths.normalize(_spaths.join("/", to_file)).split("/")[:-1]
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frm_segments = _spaths.normalize(_spaths.join("/", frm_file)).split("/")[:-1]
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if len(to_segments) == 0 and len(frm_segments) == 0:
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return to_file
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# since we prefix a "/" and normalize, the first segment is always "". So split point will be at least 1.
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split_point = 1
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# If either of the paths starts with ../ then assume that any shared paths are a coincidence.
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if to_segments[0] != ".." and frm_segments != "..":
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longest_common = []
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for to_seg, frm_seg in zip(to_segments, frm_segments):
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if to_seg == frm_seg:
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longest_common.append(to_seg)
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else:
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break
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split_point = len(longest_common)
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return _spaths.join(
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*(
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[".."] * (len(frm_segments) - split_point + parent_count) +
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to_segments[split_point:] +
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[_spaths.basename(to_file)]
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)
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)
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def _to_output_relative_path(f):
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"The relative path from bazel-out/[arch]/bin to the given File object"
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if f.is_source:
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execroot = "../../../"
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else:
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execroot = ""
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if f.short_path.startswith("../"):
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path = "external/" + f.short_path[3:]
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else:
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path = f.short_path
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return execroot + path
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def _to_manifest_path(ctx, file):
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"""The runfiles manifest entry path for a file
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This is the full runfiles path of a file including its workspace name as
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the first segment. We refert to it as the manifest path as it is the path
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flavor that is used for in the runfiles MANIFEST file.
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We must avoid using non-normalized paths (workspace/../other_workspace/path)
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in order to locate entries by their key.
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Args:
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ctx: starlark rule execution context
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file: a File object
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Returns:
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The runfiles manifest entry path for a file
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"""
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if file.short_path.startswith("../"):
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return file.short_path[3:]
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else:
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return ctx.workspace_name + "/" + file.short_path
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def _to_workspace_path(file):
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"""The workspace relative path for a file
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This is the full runfiles path of a file excluding its workspace name.
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This differs from root path and manifest path as it does not include the
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repository name if the file is from an external repository.
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Args:
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file: a File object
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Returns:
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The workspace relative path for a file
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"""
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if file.short_path.startswith("../"):
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return "/".join(file.short_path.split("/")[2:])
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else:
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return file.short_path
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paths = struct(
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relative_file = _relative_file,
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to_manifest_path = _to_manifest_path,
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to_output_relative_path = _to_output_relative_path,
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to_workspace_path = _to_workspace_path,
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)
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