mirror of
https://github.com/bazel-contrib/bazel-lib
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88 lines
3.2 KiB
Python
88 lines
3.2 KiB
Python
"""output_files implementation
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"""
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load("//lib:utils.bzl", _to_label = "to_label")
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def _output_files(ctx):
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files = []
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files_depset = depset()
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if ctx.attr.output_group:
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if OutputGroupInfo not in ctx.attr.target:
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msg = "%s output_group is specified but %s does not provide an OutputGroupInfo" % (ctx.attr.output_group, ctx.attr.target)
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fail(msg)
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if ctx.attr.output_group not in ctx.attr.target[OutputGroupInfo]:
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msg = "%s output_group is specified but %s does not provide this output group" % (ctx.attr.output_group, ctx.attr.target)
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fail(msg)
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files_depset = ctx.attr.target[OutputGroupInfo][ctx.attr.output_group]
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else:
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files_depset = ctx.attr.target[DefaultInfo].files
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for path in ctx.attr.paths:
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file = _find_short_path_in_files_depset(files_depset, path)
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if not file:
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if ctx.attr.output_group:
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msg = "%s file not found within the %s output group of %s" % (path, ctx.attr.output_group, ctx.attr.target)
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else:
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msg = "%s file not found within the DefaultInfo of %s" % (path, ctx.attr.target)
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fail(msg)
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files.append(file)
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return [DefaultInfo(
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files = depset(direct = files),
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runfiles = ctx.runfiles(files = files),
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)]
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output_files = rule(
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doc = "A rule that provides file(s) specific via DefaultInfo from a given target's DefaultInfo or OutputGroupInfo",
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implementation = _output_files,
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attrs = {
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"target": attr.label(
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doc = "the target to look in for requested paths in its' DefaultInfo or OutputGroupInfo",
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mandatory = True,
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),
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"paths": attr.string_list(
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doc = "the paths of the file(s), relative to their roots, to provide via DefaultInfo from the given target's DefaultInfo or OutputGroupInfo",
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mandatory = True,
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allow_empty = False,
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),
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"output_group": attr.string(
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doc = "if set, we look in the specified output group for paths instead of DefaultInfo",
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),
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},
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provides = [DefaultInfo],
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)
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def make_output_files(name, target, paths, **kwargs):
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"""Helper function to generate a output_files target and return its label.
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Args:
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name: unique name for the generated `output_files` target
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target: `target` attribute passed to generated `output_files` target
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paths: `paths` attribute passed to generated `output_files` target
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**kwargs: parameters to pass to generated `output_files` target
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Returns:
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The label `name`
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"""
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output_files(
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name = name,
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target = target,
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paths = paths,
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**kwargs
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)
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return _to_label(name)
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def _find_short_path_in_files_depset(files_depset, short_path):
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"""Helper function find a file in a DefaultInfo by short path
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Args:
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files_depset: a depset
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short_path: the short path (path relative to root) to search for
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Returns:
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The File if found else None
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"""
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if files_depset:
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for file in files_depset.to_list():
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if file.short_path == short_path:
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return file
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return None
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